| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Mickaël Salaün | 21651 | 92.46% | 21 | 67.74% |
| Günther Noack | 1507 | 6.44% | 6 | 19.35% |
| Jeff Xu | 157 | 0.67% | 1 | 3.23% |
| Konstantin Meskhidze | 84 | 0.36% | 1 | 3.23% |
| Ding Xiang | 10 | 0.04% | 1 | 3.23% |
| Hu Yadi | 8 | 0.03% | 1 | 3.23% |
| Total | 23417 | 31 |
// SPDX-License-Identifier: GPL-2.0 /* * Landlock tests - Filesystem * * Copyright © 2017-2020 Mickaël Salaün <mic@digikod.net> * Copyright © 2020 ANSSI * Copyright © 2020-2022 Microsoft Corporation */ #define _GNU_SOURCE #include <fcntl.h> #include <linux/landlock.h> #include <linux/magic.h> #include <sched.h> #include <stdio.h> #include <string.h> #include <sys/capability.h> #include <sys/mount.h> #include <sys/prctl.h> #include <sys/sendfile.h> #include <sys/stat.h> #include <sys/sysmacros.h> #include <sys/vfs.h> #include <unistd.h> #include "common.h" #ifndef renameat2 int renameat2(int olddirfd, const char *oldpath, int newdirfd, const char *newpath, unsigned int flags) { return syscall(__NR_renameat2, olddirfd, oldpath, newdirfd, newpath, flags); } #endif #ifndef RENAME_EXCHANGE #define RENAME_EXCHANGE (1 << 1) #endif #define TMP_DIR "tmp" #define BINARY_PATH "./true" /* Paths (sibling number and depth) */ static const char dir_s1d1[] = TMP_DIR "/s1d1"; static const char file1_s1d1[] = TMP_DIR "/s1d1/f1"; static const char file2_s1d1[] = TMP_DIR "/s1d1/f2"; static const char dir_s1d2[] = TMP_DIR "/s1d1/s1d2"; static const char file1_s1d2[] = TMP_DIR "/s1d1/s1d2/f1"; static const char file2_s1d2[] = TMP_DIR "/s1d1/s1d2/f2"; static const char dir_s1d3[] = TMP_DIR "/s1d1/s1d2/s1d3"; static const char file1_s1d3[] = TMP_DIR "/s1d1/s1d2/s1d3/f1"; static const char file2_s1d3[] = TMP_DIR "/s1d1/s1d2/s1d3/f2"; static const char dir_s2d1[] = TMP_DIR "/s2d1"; static const char file1_s2d1[] = TMP_DIR "/s2d1/f1"; static const char dir_s2d2[] = TMP_DIR "/s2d1/s2d2"; static const char file1_s2d2[] = TMP_DIR "/s2d1/s2d2/f1"; static const char dir_s2d3[] = TMP_DIR "/s2d1/s2d2/s2d3"; static const char file1_s2d3[] = TMP_DIR "/s2d1/s2d2/s2d3/f1"; static const char file2_s2d3[] = TMP_DIR "/s2d1/s2d2/s2d3/f2"; static const char dir_s3d1[] = TMP_DIR "/s3d1"; static const char file1_s3d1[] = TMP_DIR "/s3d1/f1"; /* dir_s3d2 is a mount point. */ static const char dir_s3d2[] = TMP_DIR "/s3d1/s3d2"; static const char dir_s3d3[] = TMP_DIR "/s3d1/s3d2/s3d3"; /* * layout1 hierarchy: * * tmp * ├── s1d1 * │ ├── f1 * │ ├── f2 * │ └── s1d2 * │ ├── f1 * │ ├── f2 * │ └── s1d3 * │ ├── f1 * │ └── f2 * ├── s2d1 * │ ├── f1 * │ └── s2d2 * │ ├── f1 * │ └── s2d3 * │ ├── f1 * │ └── f2 * └── s3d1 * ├── f1 * └── s3d2 * └── s3d3 */ static bool fgrep(FILE *const inf, const char *const str) { char line[32]; const int slen = strlen(str); while (!feof(inf)) { if (!fgets(line, sizeof(line), inf)) break; if (strncmp(line, str, slen)) continue; return true; } return false; } static bool supports_filesystem(const char *const filesystem) { char str[32]; int len; bool res = true; FILE *const inf = fopen("/proc/filesystems", "r"); /* * Consider that the filesystem is supported if we cannot get the * supported ones. */ if (!inf) return true; /* filesystem can be null for bind mounts. */ if (!filesystem) goto out; len = snprintf(str, sizeof(str), "nodev\t%s\n", filesystem); if (len >= sizeof(str)) /* Ignores too-long filesystem names. */ goto out; res = fgrep(inf, str); out: fclose(inf); return res; } static bool cwd_matches_fs(unsigned int fs_magic) { struct statfs statfs_buf; if (!fs_magic) return true; if (statfs(".", &statfs_buf)) return true; return statfs_buf.f_type == fs_magic; } static void mkdir_parents(struct __test_metadata *const _metadata, const char *const path) { char *walker; const char *parent; int i, err; ASSERT_NE(path[0], '\0'); walker = strdup(path); ASSERT_NE(NULL, walker); parent = walker; for (i = 1; walker[i]; i++) { if (walker[i] != '/') continue; walker[i] = '\0'; err = mkdir(parent, 0700); ASSERT_FALSE(err && errno != EEXIST) { TH_LOG("Failed to create directory \"%s\": %s", parent, strerror(errno)); } walker[i] = '/'; } free(walker); } static void create_directory(struct __test_metadata *const _metadata, const char *const path) { mkdir_parents(_metadata, path); ASSERT_EQ(0, mkdir(path, 0700)) { TH_LOG("Failed to create directory \"%s\": %s", path, strerror(errno)); } } static void create_file(struct __test_metadata *const _metadata, const char *const path) { mkdir_parents(_metadata, path); ASSERT_EQ(0, mknod(path, S_IFREG | 0700, 0)) { TH_LOG("Failed to create file \"%s\": %s", path, strerror(errno)); } } static int remove_path(const char *const path) { char *walker; int i, ret, err = 0; walker = strdup(path); if (!walker) { err = ENOMEM; goto out; } if (unlink(path) && rmdir(path)) { if (errno != ENOENT && errno != ENOTDIR) err = errno; goto out; } for (i = strlen(walker); i > 0; i--) { if (walker[i] != '/') continue; walker[i] = '\0'; ret = rmdir(walker); if (ret) { if (errno != ENOTEMPTY && errno != EBUSY) err = errno; goto out; } if (strcmp(walker, TMP_DIR) == 0) goto out; } out: free(walker); return err; } struct mnt_opt { const char *const source; const char *const type; const unsigned long flags; const char *const data; }; #define MNT_TMP_DATA "size=4m,mode=700" static const struct mnt_opt mnt_tmp = { .type = "tmpfs", .data = MNT_TMP_DATA, }; static int mount_opt(const struct mnt_opt *const mnt, const char *const target) { return mount(mnt->source ?: mnt->type, target, mnt->type, mnt->flags, mnt->data); } static void prepare_layout_opt(struct __test_metadata *const _metadata, const struct mnt_opt *const mnt) { disable_caps(_metadata); umask(0077); create_directory(_metadata, TMP_DIR); /* * Do not pollute the rest of the system: creates a private mount point * for tests relying on pivot_root(2) and move_mount(2). */ set_cap(_metadata, CAP_SYS_ADMIN); ASSERT_EQ(0, unshare(CLONE_NEWNS | CLONE_NEWCGROUP)); ASSERT_EQ(0, mount_opt(mnt, TMP_DIR)) { TH_LOG("Failed to mount the %s filesystem: %s", mnt->type, strerror(errno)); /* * FIXTURE_TEARDOWN() is not called when FIXTURE_SETUP() * failed, so we need to explicitly do a minimal cleanup to * avoid cascading errors with other tests that don't depend on * the same filesystem. */ remove_path(TMP_DIR); } ASSERT_EQ(0, mount(NULL, TMP_DIR, NULL, MS_PRIVATE | MS_REC, NULL)); clear_cap(_metadata, CAP_SYS_ADMIN); } static void prepare_layout(struct __test_metadata *const _metadata) { prepare_layout_opt(_metadata, &mnt_tmp); } static void cleanup_layout(struct __test_metadata *const _metadata) { set_cap(_metadata, CAP_SYS_ADMIN); EXPECT_EQ(0, umount(TMP_DIR)); clear_cap(_metadata, CAP_SYS_ADMIN); EXPECT_EQ(0, remove_path(TMP_DIR)); } /* clang-format off */ FIXTURE(layout0) {}; /* clang-format on */ FIXTURE_SETUP(layout0) { prepare_layout(_metadata); } FIXTURE_TEARDOWN(layout0) { cleanup_layout(_metadata); } static void create_layout1(struct __test_metadata *const _metadata) { create_file(_metadata, file1_s1d1); create_file(_metadata, file1_s1d2); create_file(_metadata, file1_s1d3); create_file(_metadata, file2_s1d1); create_file(_metadata, file2_s1d2); create_file(_metadata, file2_s1d3); create_file(_metadata, file1_s2d1); create_file(_metadata, file1_s2d2); create_file(_metadata, file1_s2d3); create_file(_metadata, file2_s2d3); create_file(_metadata, file1_s3d1); create_directory(_metadata, dir_s3d2); set_cap(_metadata, CAP_SYS_ADMIN); ASSERT_EQ(0, mount_opt(&mnt_tmp, dir_s3d2)); clear_cap(_metadata, CAP_SYS_ADMIN); ASSERT_EQ(0, mkdir(dir_s3d3, 0700)); } static void remove_layout1(struct __test_metadata *const _metadata) { EXPECT_EQ(0, remove_path(file2_s1d3)); EXPECT_EQ(0, remove_path(file2_s1d2)); EXPECT_EQ(0, remove_path(file2_s1d1)); EXPECT_EQ(0, remove_path(file1_s1d3)); EXPECT_EQ(0, remove_path(file1_s1d2)); EXPECT_EQ(0, remove_path(file1_s1d1)); EXPECT_EQ(0, remove_path(dir_s1d3)); EXPECT_EQ(0, remove_path(file2_s2d3)); EXPECT_EQ(0, remove_path(file1_s2d3)); EXPECT_EQ(0, remove_path(file1_s2d2)); EXPECT_EQ(0, remove_path(file1_s2d1)); EXPECT_EQ(0, remove_path(dir_s2d2)); EXPECT_EQ(0, remove_path(file1_s3d1)); EXPECT_EQ(0, remove_path(dir_s3d3)); set_cap(_metadata, CAP_SYS_ADMIN); umount(dir_s3d2); clear_cap(_metadata, CAP_SYS_ADMIN); EXPECT_EQ(0, remove_path(dir_s3d2)); } /* clang-format off */ FIXTURE(layout1) {}; /* clang-format on */ FIXTURE_SETUP(layout1) { prepare_layout(_metadata); create_layout1(_metadata); } FIXTURE_TEARDOWN(layout1) { remove_layout1(_metadata); cleanup_layout(_metadata); } /* * This helper enables to use the ASSERT_* macros and print the line number * pointing to the test caller. */ static int test_open_rel(const int dirfd, const char *const path, const int flags) { int fd; /* Works with file and directories. */ fd = openat(dirfd, path, flags | O_CLOEXEC); if (fd < 0) return errno; /* * Mixing error codes from close(2) and open(2) should not lead to any * (access type) confusion for this test. */ if (close(fd) != 0) return errno; return 0; } static int test_open(const char *const path, const int flags) { return test_open_rel(AT_FDCWD, path, flags); } TEST_F_FORK(layout1, no_restriction) { ASSERT_EQ(0, test_open(dir_s1d1, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d1, O_RDONLY)); ASSERT_EQ(0, test_open(file2_s1d1, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s1d2, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d2, O_RDONLY)); ASSERT_EQ(0, test_open(file2_s1d2, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s1d3, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d3, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s2d1, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s2d1, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s2d2, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s2d2, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s2d3, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s2d3, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s3d1, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s3d2, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s3d3, O_RDONLY)); } TEST_F_FORK(layout1, inval) { struct landlock_path_beneath_attr path_beneath = { .allowed_access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, .parent_fd = -1, }; struct landlock_ruleset_attr ruleset_attr = { .handled_access_fs = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, }; int ruleset_fd; path_beneath.parent_fd = open(dir_s1d2, O_PATH | O_DIRECTORY | O_CLOEXEC); ASSERT_LE(0, path_beneath.parent_fd); ruleset_fd = open(dir_s1d1, O_PATH | O_DIRECTORY | O_CLOEXEC); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath, 0)); /* Returns EBADF because ruleset_fd is not a landlock-ruleset FD. */ ASSERT_EQ(EBADF, errno); ASSERT_EQ(0, close(ruleset_fd)); ruleset_fd = open(dir_s1d1, O_DIRECTORY | O_CLOEXEC); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath, 0)); /* Returns EBADFD because ruleset_fd is not a valid ruleset. */ ASSERT_EQ(EBADFD, errno); ASSERT_EQ(0, close(ruleset_fd)); /* Gets a real ruleset. */ ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath, 0)); ASSERT_EQ(0, close(path_beneath.parent_fd)); /* Tests without O_PATH. */ path_beneath.parent_fd = open(dir_s1d2, O_DIRECTORY | O_CLOEXEC); ASSERT_LE(0, path_beneath.parent_fd); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath, 0)); ASSERT_EQ(0, close(path_beneath.parent_fd)); /* Tests with a ruleset FD. */ path_beneath.parent_fd = ruleset_fd; ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath, 0)); ASSERT_EQ(EBADFD, errno); /* Checks unhandled allowed_access. */ path_beneath.parent_fd = open(dir_s1d2, O_PATH | O_DIRECTORY | O_CLOEXEC); ASSERT_LE(0, path_beneath.parent_fd); /* Test with legitimate values. */ path_beneath.allowed_access |= LANDLOCK_ACCESS_FS_EXECUTE; ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath, 0)); ASSERT_EQ(EINVAL, errno); path_beneath.allowed_access &= ~LANDLOCK_ACCESS_FS_EXECUTE; /* Tests with denied-by-default access right. */ path_beneath.allowed_access |= LANDLOCK_ACCESS_FS_REFER; ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath, 0)); ASSERT_EQ(EINVAL, errno); path_beneath.allowed_access &= ~LANDLOCK_ACCESS_FS_REFER; /* Test with unknown (64-bits) value. */ path_beneath.allowed_access |= (1ULL << 60); ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath, 0)); ASSERT_EQ(EINVAL, errno); path_beneath.allowed_access &= ~(1ULL << 60); /* Test with no access. */ path_beneath.allowed_access = 0; ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath, 0)); ASSERT_EQ(ENOMSG, errno); path_beneath.allowed_access &= ~(1ULL << 60); ASSERT_EQ(0, close(path_beneath.parent_fd)); /* Enforces the ruleset. */ ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)); ASSERT_EQ(0, landlock_restrict_self(ruleset_fd, 0)); ASSERT_EQ(0, close(ruleset_fd)); } /* clang-format off */ #define ACCESS_FILE ( \ LANDLOCK_ACCESS_FS_EXECUTE | \ LANDLOCK_ACCESS_FS_WRITE_FILE | \ LANDLOCK_ACCESS_FS_READ_FILE | \ LANDLOCK_ACCESS_FS_TRUNCATE) #define ACCESS_LAST LANDLOCK_ACCESS_FS_TRUNCATE #define ACCESS_ALL ( \ ACCESS_FILE | \ LANDLOCK_ACCESS_FS_READ_DIR | \ LANDLOCK_ACCESS_FS_REMOVE_DIR | \ LANDLOCK_ACCESS_FS_REMOVE_FILE | \ LANDLOCK_ACCESS_FS_MAKE_CHAR | \ LANDLOCK_ACCESS_FS_MAKE_DIR | \ LANDLOCK_ACCESS_FS_MAKE_REG | \ LANDLOCK_ACCESS_FS_MAKE_SOCK | \ LANDLOCK_ACCESS_FS_MAKE_FIFO | \ LANDLOCK_ACCESS_FS_MAKE_BLOCK | \ LANDLOCK_ACCESS_FS_MAKE_SYM | \ LANDLOCK_ACCESS_FS_REFER) /* clang-format on */ TEST_F_FORK(layout1, file_and_dir_access_rights) { __u64 access; int err; struct landlock_path_beneath_attr path_beneath_file = {}, path_beneath_dir = {}; struct landlock_ruleset_attr ruleset_attr = { .handled_access_fs = ACCESS_ALL, }; const int ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); /* Tests access rights for files. */ path_beneath_file.parent_fd = open(file1_s1d2, O_PATH | O_CLOEXEC); ASSERT_LE(0, path_beneath_file.parent_fd); /* Tests access rights for directories. */ path_beneath_dir.parent_fd = open(dir_s1d2, O_PATH | O_DIRECTORY | O_CLOEXEC); ASSERT_LE(0, path_beneath_dir.parent_fd); for (access = 1; access <= ACCESS_LAST; access <<= 1) { path_beneath_dir.allowed_access = access; ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath_dir, 0)); path_beneath_file.allowed_access = access; err = landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath_file, 0); if (access & ACCESS_FILE) { ASSERT_EQ(0, err); } else { ASSERT_EQ(-1, err); ASSERT_EQ(EINVAL, errno); } } ASSERT_EQ(0, close(path_beneath_file.parent_fd)); ASSERT_EQ(0, close(path_beneath_dir.parent_fd)); ASSERT_EQ(0, close(ruleset_fd)); } TEST_F_FORK(layout0, ruleset_with_unknown_access) { __u64 access_mask; for (access_mask = 1ULL << 63; access_mask != ACCESS_LAST; access_mask >>= 1) { struct landlock_ruleset_attr ruleset_attr = { .handled_access_fs = access_mask, }; ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0)); ASSERT_EQ(EINVAL, errno); } } TEST_F_FORK(layout0, rule_with_unknown_access) { __u64 access; struct landlock_path_beneath_attr path_beneath = {}; const struct landlock_ruleset_attr ruleset_attr = { .handled_access_fs = ACCESS_ALL, }; const int ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); path_beneath.parent_fd = open(TMP_DIR, O_PATH | O_DIRECTORY | O_CLOEXEC); ASSERT_LE(0, path_beneath.parent_fd); for (access = 1ULL << 63; access != ACCESS_LAST; access >>= 1) { path_beneath.allowed_access = access; EXPECT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath, 0)); EXPECT_EQ(EINVAL, errno); } ASSERT_EQ(0, close(path_beneath.parent_fd)); ASSERT_EQ(0, close(ruleset_fd)); } TEST_F_FORK(layout1, rule_with_unhandled_access) { struct landlock_ruleset_attr ruleset_attr = { .handled_access_fs = LANDLOCK_ACCESS_FS_EXECUTE, }; struct landlock_path_beneath_attr path_beneath = {}; int ruleset_fd; __u64 access; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); path_beneath.parent_fd = open(file1_s1d2, O_PATH | O_CLOEXEC); ASSERT_LE(0, path_beneath.parent_fd); for (access = 1; access > 0; access <<= 1) { int err; path_beneath.allowed_access = access; err = landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath, 0); if (access == ruleset_attr.handled_access_fs) { EXPECT_EQ(0, err); } else { EXPECT_EQ(-1, err); EXPECT_EQ(EINVAL, errno); } } EXPECT_EQ(0, close(path_beneath.parent_fd)); EXPECT_EQ(0, close(ruleset_fd)); } static void add_path_beneath(struct __test_metadata *const _metadata, const int ruleset_fd, const __u64 allowed_access, const char *const path) { struct landlock_path_beneath_attr path_beneath = { .allowed_access = allowed_access, }; path_beneath.parent_fd = open(path, O_PATH | O_CLOEXEC); ASSERT_LE(0, path_beneath.parent_fd) { TH_LOG("Failed to open directory \"%s\": %s", path, strerror(errno)); } ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath, 0)) { TH_LOG("Failed to update the ruleset with \"%s\": %s", path, strerror(errno)); } ASSERT_EQ(0, close(path_beneath.parent_fd)); } struct rule { const char *path; __u64 access; }; /* clang-format off */ #define ACCESS_RO ( \ LANDLOCK_ACCESS_FS_READ_FILE | \ LANDLOCK_ACCESS_FS_READ_DIR) #define ACCESS_RW ( \ ACCESS_RO | \ LANDLOCK_ACCESS_FS_WRITE_FILE) /* clang-format on */ static int create_ruleset(struct __test_metadata *const _metadata, const __u64 handled_access_fs, const struct rule rules[]) { int ruleset_fd, i; struct landlock_ruleset_attr ruleset_attr = { .handled_access_fs = handled_access_fs, }; ASSERT_NE(NULL, rules) { TH_LOG("No rule list"); } ASSERT_NE(NULL, rules[0].path) { TH_LOG("Empty rule list"); } ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd) { TH_LOG("Failed to create a ruleset: %s", strerror(errno)); } for (i = 0; rules[i].path; i++) { add_path_beneath(_metadata, ruleset_fd, rules[i].access, rules[i].path); } return ruleset_fd; } TEST_F_FORK(layout0, proc_nsfs) { const struct rule rules[] = { { .path = "/dev/null", .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, }, {}, }; struct landlock_path_beneath_attr path_beneath; const int ruleset_fd = create_ruleset( _metadata, rules[0].access | LANDLOCK_ACCESS_FS_READ_DIR, rules); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(0, test_open("/proc/self/ns/mnt", O_RDONLY)); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(EACCES, test_open("/", O_RDONLY)); ASSERT_EQ(EACCES, test_open("/dev", O_RDONLY)); ASSERT_EQ(0, test_open("/dev/null", O_RDONLY)); ASSERT_EQ(EACCES, test_open("/dev/full", O_RDONLY)); ASSERT_EQ(EACCES, test_open("/proc", O_RDONLY)); ASSERT_EQ(EACCES, test_open("/proc/self", O_RDONLY)); ASSERT_EQ(EACCES, test_open("/proc/self/ns", O_RDONLY)); /* * Because nsfs is an internal filesystem, /proc/self/ns/mnt is a * disconnected path. Such path cannot be identified and must then be * allowed. */ ASSERT_EQ(0, test_open("/proc/self/ns/mnt", O_RDONLY)); /* * Checks that it is not possible to add nsfs-like filesystem * references to a ruleset. */ path_beneath.allowed_access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, path_beneath.parent_fd = open("/proc/self/ns/mnt", O_PATH | O_CLOEXEC); ASSERT_LE(0, path_beneath.parent_fd); ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath, 0)); ASSERT_EQ(EBADFD, errno); ASSERT_EQ(0, close(path_beneath.parent_fd)); } TEST_F_FORK(layout0, unpriv) { const struct rule rules[] = { { .path = TMP_DIR, .access = ACCESS_RO, }, {}, }; int ruleset_fd; drop_caps(_metadata); ruleset_fd = create_ruleset(_metadata, ACCESS_RO, rules); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(-1, landlock_restrict_self(ruleset_fd, 0)); ASSERT_EQ(EPERM, errno); /* enforce_ruleset() calls prctl(no_new_privs). */ enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); } TEST_F_FORK(layout1, effective_access) { const struct rule rules[] = { { .path = dir_s1d2, .access = ACCESS_RO, }, { .path = file1_s2d2, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules); char buf; int reg_fd; ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Tests on a directory (with or without O_PATH). */ ASSERT_EQ(EACCES, test_open("/", O_RDONLY)); ASSERT_EQ(0, test_open("/", O_RDONLY | O_PATH)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s1d1, O_RDONLY | O_PATH)); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d1, O_RDONLY | O_PATH)); ASSERT_EQ(0, test_open(dir_s1d2, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d2, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s1d3, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d3, O_RDONLY)); /* Tests on a file (with or without O_PATH). */ ASSERT_EQ(EACCES, test_open(dir_s2d2, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s2d2, O_RDONLY | O_PATH)); ASSERT_EQ(0, test_open(file1_s2d2, O_RDONLY)); /* Checks effective read and write actions. */ reg_fd = open(file1_s2d2, O_RDWR | O_CLOEXEC); ASSERT_LE(0, reg_fd); ASSERT_EQ(1, write(reg_fd, ".", 1)); ASSERT_LE(0, lseek(reg_fd, 0, SEEK_SET)); ASSERT_EQ(1, read(reg_fd, &buf, 1)); ASSERT_EQ('.', buf); ASSERT_EQ(0, close(reg_fd)); /* Just in case, double-checks effective actions. */ reg_fd = open(file1_s2d2, O_RDONLY | O_CLOEXEC); ASSERT_LE(0, reg_fd); ASSERT_EQ(-1, write(reg_fd, &buf, 1)); ASSERT_EQ(EBADF, errno); ASSERT_EQ(0, close(reg_fd)); } TEST_F_FORK(layout1, unhandled_access) { const struct rule rules[] = { { .path = dir_s1d2, .access = ACCESS_RO, }, {}, }; /* Here, we only handle read accesses, not write accesses. */ const int ruleset_fd = create_ruleset(_metadata, ACCESS_RO, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* * Because the policy does not handle LANDLOCK_ACCESS_FS_WRITE_FILE, * opening for write-only should be allowed, but not read-write. */ ASSERT_EQ(0, test_open(file1_s1d1, O_WRONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_RDWR)); ASSERT_EQ(0, test_open(file1_s1d2, O_WRONLY)); ASSERT_EQ(0, test_open(file1_s1d2, O_RDWR)); } TEST_F_FORK(layout1, ruleset_overlap) { const struct rule rules[] = { /* These rules should be ORed among them. */ { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, }, { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_READ_DIR, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks s1d1 hierarchy. */ ASSERT_EQ(EACCES, test_open(file1_s1d1, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_WRONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_RDWR)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); /* Checks s1d2 hierarchy. */ ASSERT_EQ(0, test_open(file1_s1d2, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d2, O_WRONLY)); ASSERT_EQ(0, test_open(file1_s1d2, O_RDWR)); ASSERT_EQ(0, test_open(dir_s1d2, O_RDONLY | O_DIRECTORY)); /* Checks s1d3 hierarchy. */ ASSERT_EQ(0, test_open(file1_s1d3, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d3, O_WRONLY)); ASSERT_EQ(0, test_open(file1_s1d3, O_RDWR)); ASSERT_EQ(0, test_open(dir_s1d3, O_RDONLY | O_DIRECTORY)); } TEST_F_FORK(layout1, layer_rule_unions) { const struct rule layer1[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, /* dir_s1d3 should allow READ_FILE and WRITE_FILE (O_RDWR). */ { .path = dir_s1d3, .access = LANDLOCK_ACCESS_FS_WRITE_FILE, }, {}, }; const struct rule layer2[] = { /* Doesn't change anything from layer1. */ { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, }, {}, }; const struct rule layer3[] = { /* Only allows write (but not read) to dir_s1d3. */ { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_WRITE_FILE, }, {}, }; int ruleset_fd = create_ruleset(_metadata, ACCESS_RW, layer1); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks s1d1 hierarchy with layer1. */ ASSERT_EQ(EACCES, test_open(file1_s1d1, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_WRONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_RDWR)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); /* Checks s1d2 hierarchy with layer1. */ ASSERT_EQ(0, test_open(file1_s1d2, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d2, O_WRONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d2, O_RDWR)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); /* Checks s1d3 hierarchy with layer1. */ ASSERT_EQ(0, test_open(file1_s1d3, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d3, O_WRONLY)); /* dir_s1d3 should allow READ_FILE and WRITE_FILE (O_RDWR). */ ASSERT_EQ(0, test_open(file1_s1d3, O_RDWR)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); /* Doesn't change anything from layer1. */ ruleset_fd = create_ruleset(_metadata, ACCESS_RW, layer2); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks s1d1 hierarchy with layer2. */ ASSERT_EQ(EACCES, test_open(file1_s1d1, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_WRONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_RDWR)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); /* Checks s1d2 hierarchy with layer2. */ ASSERT_EQ(0, test_open(file1_s1d2, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d2, O_WRONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d2, O_RDWR)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); /* Checks s1d3 hierarchy with layer2. */ ASSERT_EQ(0, test_open(file1_s1d3, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d3, O_WRONLY)); /* dir_s1d3 should allow READ_FILE and WRITE_FILE (O_RDWR). */ ASSERT_EQ(0, test_open(file1_s1d3, O_RDWR)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); /* Only allows write (but not read) to dir_s1d3. */ ruleset_fd = create_ruleset(_metadata, ACCESS_RW, layer3); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks s1d1 hierarchy with layer3. */ ASSERT_EQ(EACCES, test_open(file1_s1d1, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_WRONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_RDWR)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); /* Checks s1d2 hierarchy with layer3. */ ASSERT_EQ(EACCES, test_open(file1_s1d2, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d2, O_WRONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d2, O_RDWR)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); /* Checks s1d3 hierarchy with layer3. */ ASSERT_EQ(EACCES, test_open(file1_s1d3, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d3, O_WRONLY)); /* dir_s1d3 should now deny READ_FILE and WRITE_FILE (O_RDWR). */ ASSERT_EQ(EACCES, test_open(file1_s1d3, O_RDWR)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); } TEST_F_FORK(layout1, non_overlapping_accesses) { const struct rule layer1[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_MAKE_REG, }, {}, }; const struct rule layer2[] = { { .path = dir_s1d3, .access = LANDLOCK_ACCESS_FS_REMOVE_FILE, }, {}, }; int ruleset_fd; ASSERT_EQ(0, unlink(file1_s1d1)); ASSERT_EQ(0, unlink(file1_s1d2)); ruleset_fd = create_ruleset(_metadata, LANDLOCK_ACCESS_FS_MAKE_REG, layer1); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(-1, mknod(file1_s1d1, S_IFREG | 0700, 0)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(0, mknod(file1_s1d2, S_IFREG | 0700, 0)); ASSERT_EQ(0, unlink(file1_s1d2)); ruleset_fd = create_ruleset(_metadata, LANDLOCK_ACCESS_FS_REMOVE_FILE, layer2); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Unchanged accesses for file creation. */ ASSERT_EQ(-1, mknod(file1_s1d1, S_IFREG | 0700, 0)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(0, mknod(file1_s1d2, S_IFREG | 0700, 0)); /* Checks file removing. */ ASSERT_EQ(-1, unlink(file1_s1d2)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(0, unlink(file1_s1d3)); } TEST_F_FORK(layout1, interleaved_masked_accesses) { /* * Checks overly restrictive rules: * layer 1: allows R s1d1/s1d2/s1d3/file1 * layer 2: allows RW s1d1/s1d2/s1d3 * allows W s1d1/s1d2 * denies R s1d1/s1d2 * layer 3: allows R s1d1 * layer 4: allows R s1d1/s1d2 * denies W s1d1/s1d2 * layer 5: allows R s1d1/s1d2 * layer 6: allows X ---- * layer 7: allows W s1d1/s1d2 * denies R s1d1/s1d2 */ const struct rule layer1_read[] = { /* Allows read access to file1_s1d3 with the first layer. */ { .path = file1_s1d3, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, {}, }; /* First rule with write restrictions. */ const struct rule layer2_read_write[] = { /* Start by granting read-write access via its parent directory... */ { .path = dir_s1d3, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, }, /* ...but also denies read access via its grandparent directory. */ { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_WRITE_FILE, }, {}, }; const struct rule layer3_read[] = { /* Allows read access via its great-grandparent directory. */ { .path = dir_s1d1, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, {}, }; const struct rule layer4_read_write[] = { /* * Try to confuse the deny access by denying write (but not * read) access via its grandparent directory. */ { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, {}, }; const struct rule layer5_read[] = { /* * Try to override layer2's deny read access by explicitly * allowing read access via file1_s1d3's grandparent. */ { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, {}, }; const struct rule layer6_execute[] = { /* * Restricts an unrelated file hierarchy with a new access * (non-overlapping) type. */ { .path = dir_s2d1, .access = LANDLOCK_ACCESS_FS_EXECUTE, }, {}, }; const struct rule layer7_read_write[] = { /* * Finally, denies read access to file1_s1d3 via its * grandparent. */ { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_WRITE_FILE, }, {}, }; int ruleset_fd; ruleset_fd = create_ruleset(_metadata, LANDLOCK_ACCESS_FS_READ_FILE, layer1_read); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks that read access is granted for file1_s1d3 with layer 1. */ ASSERT_EQ(0, test_open(file1_s1d3, O_RDWR)); ASSERT_EQ(EACCES, test_open(file2_s1d3, O_RDONLY)); ASSERT_EQ(0, test_open(file2_s1d3, O_WRONLY)); ruleset_fd = create_ruleset(_metadata, LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, layer2_read_write); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks that previous access rights are unchanged with layer 2. */ ASSERT_EQ(0, test_open(file1_s1d3, O_RDWR)); ASSERT_EQ(EACCES, test_open(file2_s1d3, O_RDONLY)); ASSERT_EQ(0, test_open(file2_s1d3, O_WRONLY)); ruleset_fd = create_ruleset(_metadata, LANDLOCK_ACCESS_FS_READ_FILE, layer3_read); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks that previous access rights are unchanged with layer 3. */ ASSERT_EQ(0, test_open(file1_s1d3, O_RDWR)); ASSERT_EQ(EACCES, test_open(file2_s1d3, O_RDONLY)); ASSERT_EQ(0, test_open(file2_s1d3, O_WRONLY)); /* This time, denies write access for the file hierarchy. */ ruleset_fd = create_ruleset(_metadata, LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, layer4_read_write); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* * Checks that the only change with layer 4 is that write access is * denied. */ ASSERT_EQ(0, test_open(file1_s1d3, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d3, O_WRONLY)); ASSERT_EQ(EACCES, test_open(file2_s1d3, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file2_s1d3, O_WRONLY)); ruleset_fd = create_ruleset(_metadata, LANDLOCK_ACCESS_FS_READ_FILE, layer5_read); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks that previous access rights are unchanged with layer 5. */ ASSERT_EQ(0, test_open(file1_s1d3, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d3, O_WRONLY)); ASSERT_EQ(EACCES, test_open(file2_s1d3, O_WRONLY)); ASSERT_EQ(EACCES, test_open(file2_s1d3, O_RDONLY)); ruleset_fd = create_ruleset(_metadata, LANDLOCK_ACCESS_FS_EXECUTE, layer6_execute); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks that previous access rights are unchanged with layer 6. */ ASSERT_EQ(0, test_open(file1_s1d3, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d3, O_WRONLY)); ASSERT_EQ(EACCES, test_open(file2_s1d3, O_WRONLY)); ASSERT_EQ(EACCES, test_open(file2_s1d3, O_RDONLY)); ruleset_fd = create_ruleset(_metadata, LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, layer7_read_write); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks read access is now denied with layer 7. */ ASSERT_EQ(EACCES, test_open(file1_s1d3, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d3, O_WRONLY)); ASSERT_EQ(EACCES, test_open(file2_s1d3, O_WRONLY)); ASSERT_EQ(EACCES, test_open(file2_s1d3, O_RDONLY)); } TEST_F_FORK(layout1, inherit_subset) { const struct rule rules[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_READ_DIR, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_WRONLY)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); /* Write access is forbidden. */ ASSERT_EQ(EACCES, test_open(file1_s1d2, O_WRONLY)); /* Readdir access is allowed. */ ASSERT_EQ(0, test_open(dir_s1d2, O_RDONLY | O_DIRECTORY)); /* Write access is forbidden. */ ASSERT_EQ(EACCES, test_open(file1_s1d3, O_WRONLY)); /* Readdir access is allowed. */ ASSERT_EQ(0, test_open(dir_s1d3, O_RDONLY | O_DIRECTORY)); /* * Tests shared rule extension: the following rules should not grant * any new access, only remove some. Once enforced, these rules are * ANDed with the previous ones. */ add_path_beneath(_metadata, ruleset_fd, LANDLOCK_ACCESS_FS_WRITE_FILE, dir_s1d2); /* * According to ruleset_fd, dir_s1d2 should now have the * LANDLOCK_ACCESS_FS_READ_FILE and LANDLOCK_ACCESS_FS_WRITE_FILE * access rights (even if this directory is opened a second time). * However, when enforcing this updated ruleset, the ruleset tied to * the current process (i.e. its domain) will still only have the * dir_s1d2 with LANDLOCK_ACCESS_FS_READ_FILE and * LANDLOCK_ACCESS_FS_READ_DIR accesses, but * LANDLOCK_ACCESS_FS_WRITE_FILE must not be allowed because it would * be a privilege escalation. */ enforce_ruleset(_metadata, ruleset_fd); /* Same tests and results as above. */ ASSERT_EQ(EACCES, test_open(file1_s1d1, O_WRONLY)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); /* It is still forbidden to write in file1_s1d2. */ ASSERT_EQ(EACCES, test_open(file1_s1d2, O_WRONLY)); /* Readdir access is still allowed. */ ASSERT_EQ(0, test_open(dir_s1d2, O_RDONLY | O_DIRECTORY)); /* It is still forbidden to write in file1_s1d3. */ ASSERT_EQ(EACCES, test_open(file1_s1d3, O_WRONLY)); /* Readdir access is still allowed. */ ASSERT_EQ(0, test_open(dir_s1d3, O_RDONLY | O_DIRECTORY)); /* * Try to get more privileges by adding new access rights to the parent * directory: dir_s1d1. */ add_path_beneath(_metadata, ruleset_fd, ACCESS_RW, dir_s1d1); enforce_ruleset(_metadata, ruleset_fd); /* Same tests and results as above. */ ASSERT_EQ(EACCES, test_open(file1_s1d1, O_WRONLY)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); /* It is still forbidden to write in file1_s1d2. */ ASSERT_EQ(EACCES, test_open(file1_s1d2, O_WRONLY)); /* Readdir access is still allowed. */ ASSERT_EQ(0, test_open(dir_s1d2, O_RDONLY | O_DIRECTORY)); /* It is still forbidden to write in file1_s1d3. */ ASSERT_EQ(EACCES, test_open(file1_s1d3, O_WRONLY)); /* Readdir access is still allowed. */ ASSERT_EQ(0, test_open(dir_s1d3, O_RDONLY | O_DIRECTORY)); /* * Now, dir_s1d3 get a new rule tied to it, only allowing * LANDLOCK_ACCESS_FS_WRITE_FILE. The (kernel internal) difference is * that there was no rule tied to it before. */ add_path_beneath(_metadata, ruleset_fd, LANDLOCK_ACCESS_FS_WRITE_FILE, dir_s1d3); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* * Same tests and results as above, except for open(dir_s1d3) which is * now denied because the new rule mask the rule previously inherited * from dir_s1d2. */ /* Same tests and results as above. */ ASSERT_EQ(EACCES, test_open(file1_s1d1, O_WRONLY)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); /* It is still forbidden to write in file1_s1d2. */ ASSERT_EQ(EACCES, test_open(file1_s1d2, O_WRONLY)); /* Readdir access is still allowed. */ ASSERT_EQ(0, test_open(dir_s1d2, O_RDONLY | O_DIRECTORY)); /* It is still forbidden to write in file1_s1d3. */ ASSERT_EQ(EACCES, test_open(file1_s1d3, O_WRONLY)); /* * Readdir of dir_s1d3 is still allowed because of the OR policy inside * the same layer. */ ASSERT_EQ(0, test_open(dir_s1d3, O_RDONLY | O_DIRECTORY)); } TEST_F_FORK(layout1, inherit_superset) { const struct rule rules[] = { { .path = dir_s1d3, .access = ACCESS_RO, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); /* Readdir access is denied for dir_s1d2. */ ASSERT_EQ(EACCES, test_open(dir_s1d2, O_RDONLY | O_DIRECTORY)); /* Readdir access is allowed for dir_s1d3. */ ASSERT_EQ(0, test_open(dir_s1d3, O_RDONLY | O_DIRECTORY)); /* File access is allowed for file1_s1d3. */ ASSERT_EQ(0, test_open(file1_s1d3, O_RDONLY)); /* Now dir_s1d2, parent of dir_s1d3, gets a new rule tied to it. */ add_path_beneath(_metadata, ruleset_fd, LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_READ_DIR, dir_s1d2); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Readdir access is still denied for dir_s1d2. */ ASSERT_EQ(EACCES, test_open(dir_s1d2, O_RDONLY | O_DIRECTORY)); /* Readdir access is still allowed for dir_s1d3. */ ASSERT_EQ(0, test_open(dir_s1d3, O_RDONLY | O_DIRECTORY)); /* File access is still allowed for file1_s1d3. */ ASSERT_EQ(0, test_open(file1_s1d3, O_RDONLY)); } TEST_F_FORK(layout0, max_layers) { int i, err; const struct rule rules[] = { { .path = TMP_DIR, .access = ACCESS_RO, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules); ASSERT_LE(0, ruleset_fd); for (i = 0; i < 16; i++) enforce_ruleset(_metadata, ruleset_fd); for (i = 0; i < 2; i++) { err = landlock_restrict_self(ruleset_fd, 0); ASSERT_EQ(-1, err); ASSERT_EQ(E2BIG, errno); } ASSERT_EQ(0, close(ruleset_fd)); } TEST_F_FORK(layout1, empty_or_same_ruleset) { struct landlock_ruleset_attr ruleset_attr = {}; int ruleset_fd; /* Tests empty handled_access_fs. */ ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(-1, ruleset_fd); ASSERT_EQ(ENOMSG, errno); /* Enforces policy which deny read access to all files. */ ruleset_attr.handled_access_fs = LANDLOCK_ACCESS_FS_READ_FILE; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s1d1, O_RDONLY)); /* Nests a policy which deny read access to all directories. */ ruleset_attr.handled_access_fs = LANDLOCK_ACCESS_FS_READ_DIR; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_RDONLY)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY)); /* Enforces a second time with the same ruleset. */ enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); } TEST_F_FORK(layout1, rule_on_mountpoint) { const struct rule rules[] = { { .path = dir_s1d1, .access = ACCESS_RO, }, { /* dir_s3d2 is a mount point. */ .path = dir_s3d2, .access = ACCESS_RO, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(0, test_open(dir_s1d1, O_RDONLY)); ASSERT_EQ(EACCES, test_open(dir_s2d1, O_RDONLY)); ASSERT_EQ(EACCES, test_open(dir_s3d1, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s3d2, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s3d3, O_RDONLY)); } TEST_F_FORK(layout1, rule_over_mountpoint) { const struct rule rules[] = { { .path = dir_s1d1, .access = ACCESS_RO, }, { /* dir_s3d2 is a mount point. */ .path = dir_s3d1, .access = ACCESS_RO, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(0, test_open(dir_s1d1, O_RDONLY)); ASSERT_EQ(EACCES, test_open(dir_s2d1, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s3d1, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s3d2, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s3d3, O_RDONLY)); } /* * This test verifies that we can apply a landlock rule on the root directory * (which might require special handling). */ TEST_F_FORK(layout1, rule_over_root_allow_then_deny) { struct rule rules[] = { { .path = "/", .access = ACCESS_RO, }, {}, }; int ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks allowed access. */ ASSERT_EQ(0, test_open("/", O_RDONLY)); ASSERT_EQ(0, test_open(dir_s1d1, O_RDONLY)); rules[0].access = LANDLOCK_ACCESS_FS_READ_FILE; ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks denied access (on a directory). */ ASSERT_EQ(EACCES, test_open("/", O_RDONLY)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY)); } TEST_F_FORK(layout1, rule_over_root_deny) { const struct rule rules[] = { { .path = "/", .access = LANDLOCK_ACCESS_FS_READ_FILE, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks denied access (on a directory). */ ASSERT_EQ(EACCES, test_open("/", O_RDONLY)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY)); } TEST_F_FORK(layout1, rule_inside_mount_ns) { const struct rule rules[] = { { .path = "s3d3", .access = ACCESS_RO, }, {}, }; int ruleset_fd; set_cap(_metadata, CAP_SYS_ADMIN); ASSERT_EQ(0, syscall(__NR_pivot_root, dir_s3d2, dir_s3d3)) { TH_LOG("Failed to pivot root: %s", strerror(errno)); }; ASSERT_EQ(0, chdir("/")); clear_cap(_metadata, CAP_SYS_ADMIN); ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(0, test_open("s3d3", O_RDONLY)); ASSERT_EQ(EACCES, test_open("/", O_RDONLY)); } TEST_F_FORK(layout1, mount_and_pivot) { const struct rule rules[] = { { .path = dir_s3d2, .access = ACCESS_RO, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); set_cap(_metadata, CAP_SYS_ADMIN); ASSERT_EQ(-1, mount(NULL, dir_s3d2, NULL, MS_RDONLY, NULL)); ASSERT_EQ(EPERM, errno); ASSERT_EQ(-1, syscall(__NR_pivot_root, dir_s3d2, dir_s3d3)); ASSERT_EQ(EPERM, errno); clear_cap(_metadata, CAP_SYS_ADMIN); } TEST_F_FORK(layout1, move_mount) { const struct rule rules[] = { { .path = dir_s3d2, .access = ACCESS_RO, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules); ASSERT_LE(0, ruleset_fd); set_cap(_metadata, CAP_SYS_ADMIN); ASSERT_EQ(0, syscall(__NR_move_mount, AT_FDCWD, dir_s3d2, AT_FDCWD, dir_s1d2, 0)) { TH_LOG("Failed to move mount: %s", strerror(errno)); } ASSERT_EQ(0, syscall(__NR_move_mount, AT_FDCWD, dir_s1d2, AT_FDCWD, dir_s3d2, 0)); clear_cap(_metadata, CAP_SYS_ADMIN); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); set_cap(_metadata, CAP_SYS_ADMIN); ASSERT_EQ(-1, syscall(__NR_move_mount, AT_FDCWD, dir_s3d2, AT_FDCWD, dir_s1d2, 0)); ASSERT_EQ(EPERM, errno); clear_cap(_metadata, CAP_SYS_ADMIN); } TEST_F_FORK(layout1, topology_changes_with_net_only) { const struct landlock_ruleset_attr ruleset_net = { .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | LANDLOCK_ACCESS_NET_CONNECT_TCP, }; int ruleset_fd; /* Add network restrictions. */ ruleset_fd = landlock_create_ruleset(&ruleset_net, sizeof(ruleset_net), 0); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Mount, remount, move_mount, umount, and pivot_root checks. */ set_cap(_metadata, CAP_SYS_ADMIN); ASSERT_EQ(0, mount_opt(&mnt_tmp, dir_s1d2)); ASSERT_EQ(0, mount(NULL, dir_s1d2, NULL, MS_PRIVATE | MS_REC, NULL)); ASSERT_EQ(0, syscall(__NR_move_mount, AT_FDCWD, dir_s1d2, AT_FDCWD, dir_s2d2, 0)); ASSERT_EQ(0, umount(dir_s2d2)); ASSERT_EQ(0, syscall(__NR_pivot_root, dir_s3d2, dir_s3d3)); ASSERT_EQ(0, chdir("/")); clear_cap(_metadata, CAP_SYS_ADMIN); } TEST_F_FORK(layout1, topology_changes_with_net_and_fs) { const struct landlock_ruleset_attr ruleset_net_fs = { .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | LANDLOCK_ACCESS_NET_CONNECT_TCP, .handled_access_fs = LANDLOCK_ACCESS_FS_EXECUTE, }; int ruleset_fd; /* Add network and filesystem restrictions. */ ruleset_fd = landlock_create_ruleset(&ruleset_net_fs, sizeof(ruleset_net_fs), 0); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Mount, remount, move_mount, umount, and pivot_root checks. */ set_cap(_metadata, CAP_SYS_ADMIN); ASSERT_EQ(-1, mount_opt(&mnt_tmp, dir_s1d2)); ASSERT_EQ(EPERM, errno); ASSERT_EQ(-1, mount(NULL, dir_s3d2, NULL, MS_PRIVATE | MS_REC, NULL)); ASSERT_EQ(EPERM, errno); ASSERT_EQ(-1, syscall(__NR_move_mount, AT_FDCWD, dir_s3d2, AT_FDCWD, dir_s2d2, 0)); ASSERT_EQ(EPERM, errno); ASSERT_EQ(-1, umount(dir_s3d2)); ASSERT_EQ(EPERM, errno); ASSERT_EQ(-1, syscall(__NR_pivot_root, dir_s3d2, dir_s3d3)); ASSERT_EQ(EPERM, errno); clear_cap(_metadata, CAP_SYS_ADMIN); } TEST_F_FORK(layout1, release_inodes) { const struct rule rules[] = { { .path = dir_s1d1, .access = ACCESS_RO, }, { .path = dir_s3d2, .access = ACCESS_RO, }, { .path = dir_s3d3, .access = ACCESS_RO, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules); ASSERT_LE(0, ruleset_fd); /* Unmount a file hierarchy while it is being used by a ruleset. */ set_cap(_metadata, CAP_SYS_ADMIN); ASSERT_EQ(0, umount(dir_s3d2)); clear_cap(_metadata, CAP_SYS_ADMIN); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(0, test_open(file1_s1d1, O_RDONLY)); ASSERT_EQ(EACCES, test_open(dir_s3d2, O_RDONLY)); /* This dir_s3d3 would not be allowed and does not exist anyway. */ ASSERT_EQ(ENOENT, test_open(dir_s3d3, O_RDONLY)); } enum relative_access { REL_OPEN, REL_CHDIR, REL_CHROOT_ONLY, REL_CHROOT_CHDIR, }; static void test_relative_path(struct __test_metadata *const _metadata, const enum relative_access rel) { /* * Common layer to check that chroot doesn't ignore it (i.e. a chroot * is not a disconnected root directory). */ const struct rule layer1_base[] = { { .path = TMP_DIR, .access = ACCESS_RO, }, {}, }; const struct rule layer2_subs[] = { { .path = dir_s1d2, .access = ACCESS_RO, }, { .path = dir_s2d2, .access = ACCESS_RO, }, {}, }; int dirfd, ruleset_fd; ruleset_fd = create_ruleset(_metadata, ACCESS_RW, layer1_base); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ruleset_fd = create_ruleset(_metadata, ACCESS_RW, layer2_subs); ASSERT_LE(0, ruleset_fd); switch (rel) { case REL_OPEN: case REL_CHDIR: break; case REL_CHROOT_ONLY: ASSERT_EQ(0, chdir(dir_s2d2)); break; case REL_CHROOT_CHDIR: ASSERT_EQ(0, chdir(dir_s1d2)); break; default: ASSERT_TRUE(false); return; } set_cap(_metadata, CAP_SYS_CHROOT); enforce_ruleset(_metadata, ruleset_fd); switch (rel) { case REL_OPEN: dirfd = open(dir_s1d2, O_DIRECTORY); ASSERT_LE(0, dirfd); break; case REL_CHDIR: ASSERT_EQ(0, chdir(dir_s1d2)); dirfd = AT_FDCWD; break; case REL_CHROOT_ONLY: /* Do chroot into dir_s1d2 (relative to dir_s2d2). */ ASSERT_EQ(0, chroot("../../s1d1/s1d2")) { TH_LOG("Failed to chroot: %s", strerror(errno)); } dirfd = AT_FDCWD; break; case REL_CHROOT_CHDIR: /* Do chroot into dir_s1d2. */ ASSERT_EQ(0, chroot(".")) { TH_LOG("Failed to chroot: %s", strerror(errno)); } dirfd = AT_FDCWD; break; } ASSERT_EQ((rel == REL_CHROOT_CHDIR) ? 0 : EACCES, test_open_rel(dirfd, "..", O_RDONLY)); ASSERT_EQ(0, test_open_rel(dirfd, ".", O_RDONLY)); if (rel == REL_CHROOT_ONLY) { /* The current directory is dir_s2d2. */ ASSERT_EQ(0, test_open_rel(dirfd, "./s2d3", O_RDONLY)); } else { /* The current directory is dir_s1d2. */ ASSERT_EQ(0, test_open_rel(dirfd, "./s1d3", O_RDONLY)); } if (rel == REL_CHROOT_ONLY || rel == REL_CHROOT_CHDIR) { /* Checks the root dir_s1d2. */ ASSERT_EQ(0, test_open_rel(dirfd, "/..", O_RDONLY)); ASSERT_EQ(0, test_open_rel(dirfd, "/", O_RDONLY)); ASSERT_EQ(0, test_open_rel(dirfd, "/f1", O_RDONLY)); ASSERT_EQ(0, test_open_rel(dirfd, "/s1d3", O_RDONLY)); } if (rel != REL_CHROOT_CHDIR) { ASSERT_EQ(EACCES, test_open_rel(dirfd, "../../s1d1", O_RDONLY)); ASSERT_EQ(0, test_open_rel(dirfd, "../../s1d1/s1d2", O_RDONLY)); ASSERT_EQ(0, test_open_rel(dirfd, "../../s1d1/s1d2/s1d3", O_RDONLY)); ASSERT_EQ(EACCES, test_open_rel(dirfd, "../../s2d1", O_RDONLY)); ASSERT_EQ(0, test_open_rel(dirfd, "../../s2d1/s2d2", O_RDONLY)); ASSERT_EQ(0, test_open_rel(dirfd, "../../s2d1/s2d2/s2d3", O_RDONLY)); } if (rel == REL_OPEN) ASSERT_EQ(0, close(dirfd)); ASSERT_EQ(0, close(ruleset_fd)); } TEST_F_FORK(layout1, relative_open) { test_relative_path(_metadata, REL_OPEN); } TEST_F_FORK(layout1, relative_chdir) { test_relative_path(_metadata, REL_CHDIR); } TEST_F_FORK(layout1, relative_chroot_only) { test_relative_path(_metadata, REL_CHROOT_ONLY); } TEST_F_FORK(layout1, relative_chroot_chdir) { test_relative_path(_metadata, REL_CHROOT_CHDIR); } static void copy_binary(struct __test_metadata *const _metadata, const char *const dst_path) { int dst_fd, src_fd; struct stat statbuf; dst_fd = open(dst_path, O_WRONLY | O_TRUNC | O_CLOEXEC); ASSERT_LE(0, dst_fd) { TH_LOG("Failed to open \"%s\": %s", dst_path, strerror(errno)); } src_fd = open(BINARY_PATH, O_RDONLY | O_CLOEXEC); ASSERT_LE(0, src_fd) { TH_LOG("Failed to open \"" BINARY_PATH "\": %s", strerror(errno)); } ASSERT_EQ(0, fstat(src_fd, &statbuf)); ASSERT_EQ(statbuf.st_size, sendfile(dst_fd, src_fd, 0, statbuf.st_size)); ASSERT_EQ(0, close(src_fd)); ASSERT_EQ(0, close(dst_fd)); } static void test_execute(struct __test_metadata *const _metadata, const int err, const char *const path) { int status; char *const argv[] = { (char *)path, NULL }; const pid_t child = fork(); ASSERT_LE(0, child); if (child == 0) { ASSERT_EQ(err ? -1 : 0, execve(path, argv, NULL)) { TH_LOG("Failed to execute \"%s\": %s", path, strerror(errno)); }; ASSERT_EQ(err, errno); _exit(_metadata->passed ? 2 : 1); return; } ASSERT_EQ(child, waitpid(child, &status, 0)); ASSERT_EQ(1, WIFEXITED(status)); ASSERT_EQ(err ? 2 : 0, WEXITSTATUS(status)) { TH_LOG("Unexpected return code for \"%s\": %s", path, strerror(errno)); }; } TEST_F_FORK(layout1, execute) { const struct rule rules[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_EXECUTE, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, rules[0].access, rules); ASSERT_LE(0, ruleset_fd); copy_binary(_metadata, file1_s1d1); copy_binary(_metadata, file1_s1d2); copy_binary(_metadata, file1_s1d3); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(0, test_open(dir_s1d1, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d1, O_RDONLY)); test_execute(_metadata, EACCES, file1_s1d1); ASSERT_EQ(0, test_open(dir_s1d2, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d2, O_RDONLY)); test_execute(_metadata, 0, file1_s1d2); ASSERT_EQ(0, test_open(dir_s1d3, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d3, O_RDONLY)); test_execute(_metadata, 0, file1_s1d3); } TEST_F_FORK(layout1, link) { const struct rule layer1[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_MAKE_REG, }, {}, }; const struct rule layer2[] = { { .path = dir_s1d3, .access = LANDLOCK_ACCESS_FS_REMOVE_FILE, }, {}, }; int ruleset_fd = create_ruleset(_metadata, layer1[0].access, layer1); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(0, unlink(file1_s1d1)); ASSERT_EQ(0, unlink(file1_s1d2)); ASSERT_EQ(0, unlink(file1_s1d3)); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(-1, link(file2_s1d1, file1_s1d1)); ASSERT_EQ(EACCES, errno); /* Denies linking because of reparenting. */ ASSERT_EQ(-1, link(file1_s2d1, file1_s1d2)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, link(file2_s1d2, file1_s1d3)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, link(file2_s1d3, file1_s1d2)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(0, link(file2_s1d2, file1_s1d2)); ASSERT_EQ(0, link(file2_s1d3, file1_s1d3)); /* Prepares for next unlinks. */ ASSERT_EQ(0, unlink(file2_s1d2)); ASSERT_EQ(0, unlink(file2_s1d3)); ruleset_fd = create_ruleset(_metadata, layer2[0].access, layer2); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks that linkind doesn't require the ability to delete a file. */ ASSERT_EQ(0, link(file1_s1d2, file2_s1d2)); ASSERT_EQ(0, link(file1_s1d3, file2_s1d3)); } static int test_rename(const char *const oldpath, const char *const newpath) { if (rename(oldpath, newpath)) return errno; return 0; } static int test_exchange(const char *const oldpath, const char *const newpath) { if (renameat2(AT_FDCWD, oldpath, AT_FDCWD, newpath, RENAME_EXCHANGE)) return errno; return 0; } TEST_F_FORK(layout1, rename_file) { const struct rule rules[] = { { .path = dir_s1d3, .access = LANDLOCK_ACCESS_FS_REMOVE_FILE, }, { .path = dir_s2d2, .access = LANDLOCK_ACCESS_FS_REMOVE_FILE, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, rules[0].access, rules); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(0, unlink(file1_s1d2)); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* * Tries to replace a file, from a directory that allows file removal, * but to a different directory (which also allows file removal). */ ASSERT_EQ(-1, rename(file1_s2d3, file1_s1d3)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d3, AT_FDCWD, file1_s1d3, RENAME_EXCHANGE)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d3, AT_FDCWD, dir_s1d3, RENAME_EXCHANGE)); ASSERT_EQ(EXDEV, errno); /* * Tries to replace a file, from a directory that denies file removal, * to a different directory (which allows file removal). */ ASSERT_EQ(-1, rename(file1_s2d1, file1_s1d3)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d1, AT_FDCWD, file1_s1d3, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_s2d2, AT_FDCWD, file1_s1d3, RENAME_EXCHANGE)); ASSERT_EQ(EXDEV, errno); /* Exchanges files and directories that partially allow removal. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_s2d2, AT_FDCWD, file1_s2d1, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); /* Checks that file1_s2d1 cannot be removed (instead of ENOTDIR). */ ASSERT_EQ(-1, rename(dir_s2d2, file1_s2d1)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d1, AT_FDCWD, dir_s2d2, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); /* Checks that file1_s1d1 cannot be removed (instead of EISDIR). */ ASSERT_EQ(-1, rename(file1_s1d1, dir_s1d2)); ASSERT_EQ(EACCES, errno); /* Renames files with different parents. */ ASSERT_EQ(-1, rename(file1_s2d2, file1_s1d2)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(0, unlink(file1_s1d3)); ASSERT_EQ(-1, rename(file1_s2d1, file1_s1d3)); ASSERT_EQ(EACCES, errno); /* Exchanges and renames files with same parent. */ ASSERT_EQ(0, renameat2(AT_FDCWD, file2_s2d3, AT_FDCWD, file1_s2d3, RENAME_EXCHANGE)); ASSERT_EQ(0, rename(file2_s2d3, file1_s2d3)); /* Exchanges files and directories with same parent, twice. */ ASSERT_EQ(0, renameat2(AT_FDCWD, file1_s2d2, AT_FDCWD, dir_s2d3, RENAME_EXCHANGE)); ASSERT_EQ(0, renameat2(AT_FDCWD, file1_s2d2, AT_FDCWD, dir_s2d3, RENAME_EXCHANGE)); } TEST_F_FORK(layout1, rename_dir) { const struct rule rules[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_REMOVE_DIR, }, { .path = dir_s2d1, .access = LANDLOCK_ACCESS_FS_REMOVE_DIR, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, rules[0].access, rules); ASSERT_LE(0, ruleset_fd); /* Empties dir_s1d3 to allow renaming. */ ASSERT_EQ(0, unlink(file1_s1d3)); ASSERT_EQ(0, unlink(file2_s1d3)); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Exchanges and renames directory to a different parent. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_s2d3, AT_FDCWD, dir_s1d3, RENAME_EXCHANGE)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, rename(dir_s2d3, dir_s1d3)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d2, AT_FDCWD, dir_s1d3, RENAME_EXCHANGE)); ASSERT_EQ(EXDEV, errno); /* * Exchanges directory to the same parent, which doesn't allow * directory removal. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_s1d1, AT_FDCWD, dir_s2d1, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); /* Checks that dir_s1d2 cannot be removed (instead of ENOTDIR). */ ASSERT_EQ(-1, rename(dir_s1d2, file1_s1d1)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s1d1, AT_FDCWD, dir_s1d2, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); /* Checks that dir_s1d2 cannot be removed (instead of EISDIR). */ ASSERT_EQ(-1, rename(file1_s1d1, dir_s1d2)); ASSERT_EQ(EACCES, errno); /* * Exchanges and renames directory to the same parent, which allows * directory removal. */ ASSERT_EQ(0, renameat2(AT_FDCWD, dir_s1d3, AT_FDCWD, file1_s1d2, RENAME_EXCHANGE)); ASSERT_EQ(0, unlink(dir_s1d3)); ASSERT_EQ(0, mkdir(dir_s1d3, 0700)); ASSERT_EQ(0, rename(file1_s1d2, dir_s1d3)); ASSERT_EQ(0, rmdir(dir_s1d3)); } TEST_F_FORK(layout1, reparent_refer) { const struct rule layer1[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_REFER, }, { .path = dir_s2d2, .access = LANDLOCK_ACCESS_FS_REFER, }, {}, }; int ruleset_fd = create_ruleset(_metadata, LANDLOCK_ACCESS_FS_REFER, layer1); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(-1, rename(dir_s1d2, dir_s2d1)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, rename(dir_s1d2, dir_s2d2)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, rename(dir_s1d2, dir_s2d3)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, rename(dir_s1d3, dir_s2d1)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, rename(dir_s1d3, dir_s2d2)); ASSERT_EQ(EXDEV, errno); /* * Moving should only be allowed when the source and the destination * parent directory have REFER. */ ASSERT_EQ(-1, rename(dir_s1d3, dir_s2d3)); ASSERT_EQ(ENOTEMPTY, errno); ASSERT_EQ(0, unlink(file1_s2d3)); ASSERT_EQ(0, unlink(file2_s2d3)); ASSERT_EQ(0, rename(dir_s1d3, dir_s2d3)); } /* Checks renames beneath dir_s1d1. */ static void refer_denied_by_default(struct __test_metadata *const _metadata, const struct rule layer1[], const int layer1_err, const struct rule layer2[]) { int ruleset_fd; ASSERT_EQ(0, unlink(file1_s1d2)); ruleset_fd = create_ruleset(_metadata, layer1[0].access, layer1); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* * If the first layer handles LANDLOCK_ACCESS_FS_REFER (according to * layer1_err), then it allows some different-parent renames and links. */ ASSERT_EQ(layer1_err, test_rename(file1_s1d1, file1_s1d2)); if (layer1_err == 0) ASSERT_EQ(layer1_err, test_rename(file1_s1d2, file1_s1d1)); ASSERT_EQ(layer1_err, test_exchange(file2_s1d1, file2_s1d2)); ASSERT_EQ(layer1_err, test_exchange(file2_s1d2, file2_s1d1)); ruleset_fd = create_ruleset(_metadata, layer2[0].access, layer2); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* * Now, either the first or the second layer does not handle * LANDLOCK_ACCESS_FS_REFER, which means that any different-parent * renames and links are denied, thus making the layer handling * LANDLOCK_ACCESS_FS_REFER null and void. */ ASSERT_EQ(EXDEV, test_rename(file1_s1d1, file1_s1d2)); ASSERT_EQ(EXDEV, test_exchange(file2_s1d1, file2_s1d2)); ASSERT_EQ(EXDEV, test_exchange(file2_s1d2, file2_s1d1)); } const struct rule layer_dir_s1d1_refer[] = { { .path = dir_s1d1, .access = LANDLOCK_ACCESS_FS_REFER, }, {}, }; const struct rule layer_dir_s1d1_execute[] = { { /* Matches a parent directory. */ .path = dir_s1d1, .access = LANDLOCK_ACCESS_FS_EXECUTE, }, {}, }; const struct rule layer_dir_s2d1_execute[] = { { /* Does not match a parent directory. */ .path = dir_s2d1, .access = LANDLOCK_ACCESS_FS_EXECUTE, }, {}, }; /* * Tests precedence over renames: denied by default for different parent * directories, *with* a rule matching a parent directory, but not directly * denying access (with MAKE_REG nor REMOVE). */ TEST_F_FORK(layout1, refer_denied_by_default1) { refer_denied_by_default(_metadata, layer_dir_s1d1_refer, 0, layer_dir_s1d1_execute); } /* * Same test but this time turning around the ABI version order: the first * layer does not handle LANDLOCK_ACCESS_FS_REFER. */ TEST_F_FORK(layout1, refer_denied_by_default2) { refer_denied_by_default(_metadata, layer_dir_s1d1_execute, EXDEV, layer_dir_s1d1_refer); } /* * Tests precedence over renames: denied by default for different parent * directories, *without* a rule matching a parent directory, but not directly * denying access (with MAKE_REG nor REMOVE). */ TEST_F_FORK(layout1, refer_denied_by_default3) { refer_denied_by_default(_metadata, layer_dir_s1d1_refer, 0, layer_dir_s2d1_execute); } /* * Same test but this time turning around the ABI version order: the first * layer does not handle LANDLOCK_ACCESS_FS_REFER. */ TEST_F_FORK(layout1, refer_denied_by_default4) { refer_denied_by_default(_metadata, layer_dir_s2d1_execute, EXDEV, layer_dir_s1d1_refer); } TEST_F_FORK(layout1, reparent_link) { const struct rule layer1[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_MAKE_REG, }, { .path = dir_s1d3, .access = LANDLOCK_ACCESS_FS_REFER, }, { .path = dir_s2d2, .access = LANDLOCK_ACCESS_FS_REFER, }, { .path = dir_s2d3, .access = LANDLOCK_ACCESS_FS_MAKE_REG, }, {}, }; const int ruleset_fd = create_ruleset( _metadata, LANDLOCK_ACCESS_FS_MAKE_REG | LANDLOCK_ACCESS_FS_REFER, layer1); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(0, unlink(file1_s1d1)); ASSERT_EQ(0, unlink(file1_s1d2)); ASSERT_EQ(0, unlink(file1_s1d3)); /* Denies linking because of missing MAKE_REG. */ ASSERT_EQ(-1, link(file2_s1d1, file1_s1d1)); ASSERT_EQ(EACCES, errno); /* Denies linking because of missing source and destination REFER. */ ASSERT_EQ(-1, link(file1_s2d1, file1_s1d2)); ASSERT_EQ(EXDEV, errno); /* Denies linking because of missing source REFER. */ ASSERT_EQ(-1, link(file1_s2d1, file1_s1d3)); ASSERT_EQ(EXDEV, errno); /* Denies linking because of missing MAKE_REG. */ ASSERT_EQ(-1, link(file1_s2d2, file1_s1d1)); ASSERT_EQ(EACCES, errno); /* Denies linking because of missing destination REFER. */ ASSERT_EQ(-1, link(file1_s2d2, file1_s1d2)); ASSERT_EQ(EXDEV, errno); /* Allows linking because of REFER and MAKE_REG. */ ASSERT_EQ(0, link(file1_s2d2, file1_s1d3)); ASSERT_EQ(0, unlink(file1_s2d2)); /* Reverse linking denied because of missing MAKE_REG. */ ASSERT_EQ(-1, link(file1_s1d3, file1_s2d2)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(0, unlink(file1_s2d3)); /* Checks reverse linking. */ ASSERT_EQ(0, link(file1_s1d3, file1_s2d3)); ASSERT_EQ(0, unlink(file1_s1d3)); /* * This is OK for a file link, but it should not be allowed for a * directory rename (because of the superset of access rights. */ ASSERT_EQ(0, link(file1_s2d3, file1_s1d3)); ASSERT_EQ(0, unlink(file1_s1d3)); ASSERT_EQ(-1, link(file2_s1d2, file1_s1d3)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, link(file2_s1d3, file1_s1d2)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(0, link(file2_s1d2, file1_s1d2)); ASSERT_EQ(0, link(file2_s1d3, file1_s1d3)); } TEST_F_FORK(layout1, reparent_rename) { /* Same rules as for reparent_link. */ const struct rule layer1[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_MAKE_REG, }, { .path = dir_s1d3, .access = LANDLOCK_ACCESS_FS_REFER, }, { .path = dir_s2d2, .access = LANDLOCK_ACCESS_FS_REFER, }, { .path = dir_s2d3, .access = LANDLOCK_ACCESS_FS_MAKE_REG, }, {}, }; const int ruleset_fd = create_ruleset( _metadata, LANDLOCK_ACCESS_FS_MAKE_REG | LANDLOCK_ACCESS_FS_REFER, layer1); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(0, unlink(file1_s1d2)); ASSERT_EQ(0, unlink(file1_s1d3)); /* Denies renaming because of missing MAKE_REG. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, file2_s1d1, AT_FDCWD, file1_s1d1, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s1d1, AT_FDCWD, file2_s1d1, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(0, unlink(file1_s1d1)); ASSERT_EQ(-1, rename(file2_s1d1, file1_s1d1)); ASSERT_EQ(EACCES, errno); /* Even denies same file exchange. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, file2_s1d1, AT_FDCWD, file2_s1d1, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); /* Denies renaming because of missing source and destination REFER. */ ASSERT_EQ(-1, rename(file1_s2d1, file1_s1d2)); ASSERT_EQ(EXDEV, errno); /* * Denies renaming because of missing MAKE_REG, source and destination * REFER. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d1, AT_FDCWD, file2_s1d1, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, file2_s1d1, AT_FDCWD, file1_s2d1, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); /* Denies renaming because of missing source REFER. */ ASSERT_EQ(-1, rename(file1_s2d1, file1_s1d3)); ASSERT_EQ(EXDEV, errno); /* Denies renaming because of missing MAKE_REG. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d1, AT_FDCWD, file2_s1d3, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); /* Denies renaming because of missing MAKE_REG. */ ASSERT_EQ(-1, rename(file1_s2d2, file1_s1d1)); ASSERT_EQ(EACCES, errno); /* Denies renaming because of missing destination REFER*/ ASSERT_EQ(-1, rename(file1_s2d2, file1_s1d2)); ASSERT_EQ(EXDEV, errno); /* Denies exchange because of one missing MAKE_REG. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d2, AT_FDCWD, file2_s1d3, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); /* Allows renaming because of REFER and MAKE_REG. */ ASSERT_EQ(0, rename(file1_s2d2, file1_s1d3)); /* Reverse renaming denied because of missing MAKE_REG. */ ASSERT_EQ(-1, rename(file1_s1d3, file1_s2d2)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(0, unlink(file1_s2d3)); ASSERT_EQ(0, rename(file1_s1d3, file1_s2d3)); /* Tests reverse renaming. */ ASSERT_EQ(0, rename(file1_s2d3, file1_s1d3)); ASSERT_EQ(0, renameat2(AT_FDCWD, file2_s2d3, AT_FDCWD, file1_s1d3, RENAME_EXCHANGE)); ASSERT_EQ(0, rename(file1_s1d3, file1_s2d3)); /* * This is OK for a file rename, but it should not be allowed for a * directory rename (because of the superset of access rights). */ ASSERT_EQ(0, rename(file1_s2d3, file1_s1d3)); ASSERT_EQ(0, rename(file1_s1d3, file1_s2d3)); /* * Tests superset restrictions applied to directories. Not only the * dir_s2d3's parent (dir_s2d2) should be taken into account but also * access rights tied to dir_s2d3. dir_s2d2 is missing one access right * compared to dir_s1d3/file1_s1d3 (MAKE_REG) but it is provided * directly by the moved dir_s2d3. */ ASSERT_EQ(0, rename(dir_s2d3, file1_s1d3)); ASSERT_EQ(0, rename(file1_s1d3, dir_s2d3)); /* * The first rename is allowed but not the exchange because dir_s1d3's * parent (dir_s1d2) doesn't have REFER. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d3, AT_FDCWD, dir_s1d3, RENAME_EXCHANGE)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_s1d3, AT_FDCWD, file1_s2d3, RENAME_EXCHANGE)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, rename(file1_s2d3, dir_s1d3)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, rename(file2_s1d2, file1_s1d3)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, rename(file2_s1d3, file1_s1d2)); ASSERT_EQ(EXDEV, errno); /* Renaming in the same directory is always allowed. */ ASSERT_EQ(0, rename(file2_s1d2, file1_s1d2)); ASSERT_EQ(0, rename(file2_s1d3, file1_s1d3)); ASSERT_EQ(0, unlink(file1_s1d2)); /* Denies because of missing source MAKE_REG and destination REFER. */ ASSERT_EQ(-1, rename(dir_s2d3, file1_s1d2)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(0, unlink(file1_s1d3)); /* Denies because of missing source MAKE_REG and REFER. */ ASSERT_EQ(-1, rename(dir_s2d2, file1_s1d3)); ASSERT_EQ(EXDEV, errno); } static void reparent_exdev_layers_enforce1(struct __test_metadata *const _metadata) { const struct rule layer1[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_REFER, }, { /* Interesting for the layer2 tests. */ .path = dir_s1d3, .access = LANDLOCK_ACCESS_FS_MAKE_REG, }, { .path = dir_s2d2, .access = LANDLOCK_ACCESS_FS_REFER, }, { .path = dir_s2d3, .access = LANDLOCK_ACCESS_FS_MAKE_REG, }, {}, }; const int ruleset_fd = create_ruleset( _metadata, LANDLOCK_ACCESS_FS_MAKE_REG | LANDLOCK_ACCESS_FS_REFER, layer1); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); } static void reparent_exdev_layers_enforce2(struct __test_metadata *const _metadata) { const struct rule layer2[] = { { .path = dir_s2d3, .access = LANDLOCK_ACCESS_FS_MAKE_DIR, }, {}, }; /* * Same checks as before but with a second layer and a new MAKE_DIR * rule (and no explicit handling of REFER). */ const int ruleset_fd = create_ruleset(_metadata, LANDLOCK_ACCESS_FS_MAKE_DIR, layer2); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); } TEST_F_FORK(layout1, reparent_exdev_layers_rename1) { ASSERT_EQ(0, unlink(file1_s2d2)); ASSERT_EQ(0, unlink(file1_s2d3)); reparent_exdev_layers_enforce1(_metadata); /* * Moving the dir_s1d3 directory below dir_s2d2 is allowed by Landlock * because it doesn't inherit new access rights. */ ASSERT_EQ(0, rename(dir_s1d3, file1_s2d2)); ASSERT_EQ(0, rename(file1_s2d2, dir_s1d3)); /* * Moving the dir_s1d3 directory below dir_s2d3 is allowed, even if it * gets a new inherited access rights (MAKE_REG), because MAKE_REG is * already allowed for dir_s1d3. */ ASSERT_EQ(0, rename(dir_s1d3, file1_s2d3)); ASSERT_EQ(0, rename(file1_s2d3, dir_s1d3)); /* * However, moving the file1_s1d3 file below dir_s2d3 is allowed * because it cannot inherit MAKE_REG right (which is dedicated to * directories). */ ASSERT_EQ(0, rename(file1_s1d3, file1_s2d3)); reparent_exdev_layers_enforce2(_metadata); /* * Moving the dir_s1d3 directory below dir_s2d2 is now denied because * MAKE_DIR is not tied to dir_s2d2. */ ASSERT_EQ(-1, rename(dir_s1d3, file1_s2d2)); ASSERT_EQ(EACCES, errno); /* * Moving the dir_s1d3 directory below dir_s2d3 is forbidden because it * would grants MAKE_REG and MAKE_DIR rights to it. */ ASSERT_EQ(-1, rename(dir_s1d3, file1_s2d3)); ASSERT_EQ(EXDEV, errno); /* * Moving the file2_s1d3 file below dir_s2d3 is denied because the * second layer does not handle REFER, which is always denied by * default. */ ASSERT_EQ(-1, rename(file2_s1d3, file1_s2d3)); ASSERT_EQ(EXDEV, errno); } TEST_F_FORK(layout1, reparent_exdev_layers_rename2) { reparent_exdev_layers_enforce1(_metadata); /* Checks EACCES predominance over EXDEV. */ ASSERT_EQ(-1, rename(file1_s1d1, file1_s2d2)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, rename(file1_s1d2, file1_s2d2)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, rename(file1_s1d1, file1_s2d3)); ASSERT_EQ(EXDEV, errno); /* Modify layout! */ ASSERT_EQ(0, rename(file1_s1d2, file1_s2d3)); /* Without REFER source. */ ASSERT_EQ(-1, rename(dir_s1d1, file1_s2d2)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, rename(dir_s1d2, file1_s2d2)); ASSERT_EQ(EXDEV, errno); reparent_exdev_layers_enforce2(_metadata); /* Checks EACCES predominance over EXDEV. */ ASSERT_EQ(-1, rename(file1_s1d1, file1_s2d2)); ASSERT_EQ(EACCES, errno); /* Checks with actual file2_s1d2. */ ASSERT_EQ(-1, rename(file2_s1d2, file1_s2d2)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, rename(file1_s1d1, file1_s2d3)); ASSERT_EQ(EXDEV, errno); /* * Modifying the layout is now denied because the second layer does not * handle REFER, which is always denied by default. */ ASSERT_EQ(-1, rename(file2_s1d2, file1_s2d3)); ASSERT_EQ(EXDEV, errno); /* Without REFER source, EACCES wins over EXDEV. */ ASSERT_EQ(-1, rename(dir_s1d1, file1_s2d2)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, rename(dir_s1d2, file1_s2d2)); ASSERT_EQ(EACCES, errno); } TEST_F_FORK(layout1, reparent_exdev_layers_exchange1) { const char *const dir_file1_s1d2 = file1_s1d2, *const dir_file2_s2d3 = file2_s2d3; ASSERT_EQ(0, unlink(file1_s1d2)); ASSERT_EQ(0, mkdir(file1_s1d2, 0700)); ASSERT_EQ(0, unlink(file2_s2d3)); ASSERT_EQ(0, mkdir(file2_s2d3, 0700)); reparent_exdev_layers_enforce1(_metadata); /* Error predominance with file exchange: returns EXDEV and EACCES. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s1d1, AT_FDCWD, file1_s2d3, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d3, AT_FDCWD, file1_s1d1, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); /* * Checks with directories which creation could be allowed, but denied * because of access rights that would be inherited. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_file1_s1d2, AT_FDCWD, dir_file2_s2d3, RENAME_EXCHANGE)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_file2_s2d3, AT_FDCWD, dir_file1_s1d2, RENAME_EXCHANGE)); ASSERT_EQ(EXDEV, errno); /* Checks with same access rights. */ ASSERT_EQ(0, renameat2(AT_FDCWD, dir_s1d3, AT_FDCWD, dir_s2d3, RENAME_EXCHANGE)); ASSERT_EQ(0, renameat2(AT_FDCWD, dir_s2d3, AT_FDCWD, dir_s1d3, RENAME_EXCHANGE)); /* Checks with different (child-only) access rights. */ ASSERT_EQ(0, renameat2(AT_FDCWD, dir_s2d3, AT_FDCWD, dir_file1_s1d2, RENAME_EXCHANGE)); ASSERT_EQ(0, renameat2(AT_FDCWD, dir_file1_s1d2, AT_FDCWD, dir_s2d3, RENAME_EXCHANGE)); /* * Checks that exchange between file and directory are consistent. * * Moving a file (file1_s2d2) to a directory which only grants more * directory-related access rights is allowed, and at the same time * moving a directory (dir_file2_s2d3) to another directory which * grants less access rights is allowed too. * * See layout1.reparent_exdev_layers_exchange3 for inverted arguments. */ ASSERT_EQ(0, renameat2(AT_FDCWD, file1_s2d2, AT_FDCWD, dir_file2_s2d3, RENAME_EXCHANGE)); /* * However, moving back the directory is denied because it would get * more access rights than the current state and because file creation * is forbidden (in dir_s2d2). */ ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_file2_s2d3, AT_FDCWD, file1_s2d2, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d2, AT_FDCWD, dir_file2_s2d3, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); reparent_exdev_layers_enforce2(_metadata); /* Error predominance with file exchange: returns EXDEV and EACCES. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s1d1, AT_FDCWD, file1_s2d3, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d3, AT_FDCWD, file1_s1d1, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); /* Checks with directories which creation is now denied. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_file1_s1d2, AT_FDCWD, dir_file2_s2d3, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_file2_s2d3, AT_FDCWD, dir_file1_s1d2, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); /* Checks with different (child-only) access rights. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_s1d3, AT_FDCWD, dir_s2d3, RENAME_EXCHANGE)); /* Denied because of MAKE_DIR. */ ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_s2d3, AT_FDCWD, dir_s1d3, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); /* Checks with different (child-only) access rights. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_s2d3, AT_FDCWD, dir_file1_s1d2, RENAME_EXCHANGE)); /* Denied because of MAKE_DIR. */ ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_file1_s1d2, AT_FDCWD, dir_s2d3, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); /* See layout1.reparent_exdev_layers_exchange2 for complement. */ } TEST_F_FORK(layout1, reparent_exdev_layers_exchange2) { const char *const dir_file2_s2d3 = file2_s2d3; ASSERT_EQ(0, unlink(file2_s2d3)); ASSERT_EQ(0, mkdir(file2_s2d3, 0700)); reparent_exdev_layers_enforce1(_metadata); reparent_exdev_layers_enforce2(_metadata); /* Checks that exchange between file and directory are consistent. */ ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d2, AT_FDCWD, dir_file2_s2d3, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_file2_s2d3, AT_FDCWD, file1_s2d2, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); } TEST_F_FORK(layout1, reparent_exdev_layers_exchange3) { const char *const dir_file2_s2d3 = file2_s2d3; ASSERT_EQ(0, unlink(file2_s2d3)); ASSERT_EQ(0, mkdir(file2_s2d3, 0700)); reparent_exdev_layers_enforce1(_metadata); /* * Checks that exchange between file and directory are consistent, * including with inverted arguments (see * layout1.reparent_exdev_layers_exchange1). */ ASSERT_EQ(0, renameat2(AT_FDCWD, dir_file2_s2d3, AT_FDCWD, file1_s2d2, RENAME_EXCHANGE)); ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d2, AT_FDCWD, dir_file2_s2d3, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_file2_s2d3, AT_FDCWD, file1_s2d2, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); } TEST_F_FORK(layout1, reparent_remove) { const struct rule layer1[] = { { .path = dir_s1d1, .access = LANDLOCK_ACCESS_FS_REFER | LANDLOCK_ACCESS_FS_REMOVE_DIR, }, { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_REMOVE_FILE, }, { .path = dir_s2d1, .access = LANDLOCK_ACCESS_FS_REFER | LANDLOCK_ACCESS_FS_REMOVE_FILE, }, {}, }; const int ruleset_fd = create_ruleset( _metadata, LANDLOCK_ACCESS_FS_REFER | LANDLOCK_ACCESS_FS_REMOVE_DIR | LANDLOCK_ACCESS_FS_REMOVE_FILE, layer1); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Access denied because of wrong/swapped remove file/dir. */ ASSERT_EQ(-1, rename(file1_s1d1, dir_s2d2)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, rename(dir_s2d2, file1_s1d1)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s1d1, AT_FDCWD, dir_s2d2, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s1d1, AT_FDCWD, dir_s2d3, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); /* Access allowed thanks to the matching rights. */ ASSERT_EQ(-1, rename(file1_s2d1, dir_s1d2)); ASSERT_EQ(EISDIR, errno); ASSERT_EQ(-1, rename(dir_s1d2, file1_s2d1)); ASSERT_EQ(ENOTDIR, errno); ASSERT_EQ(-1, rename(dir_s1d3, file1_s2d1)); ASSERT_EQ(ENOTDIR, errno); ASSERT_EQ(0, unlink(file1_s2d1)); ASSERT_EQ(0, unlink(file1_s1d3)); ASSERT_EQ(0, unlink(file2_s1d3)); ASSERT_EQ(0, rename(dir_s1d3, file1_s2d1)); /* Effectively removes a file and a directory by exchanging them. */ ASSERT_EQ(0, mkdir(dir_s1d3, 0700)); ASSERT_EQ(0, renameat2(AT_FDCWD, file1_s2d2, AT_FDCWD, dir_s1d3, RENAME_EXCHANGE)); ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d2, AT_FDCWD, dir_s1d3, RENAME_EXCHANGE)); ASSERT_EQ(EACCES, errno); } TEST_F_FORK(layout1, reparent_dom_superset) { const struct rule layer1[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_REFER, }, { .path = file1_s1d2, .access = LANDLOCK_ACCESS_FS_EXECUTE, }, { .path = dir_s1d3, .access = LANDLOCK_ACCESS_FS_MAKE_SOCK | LANDLOCK_ACCESS_FS_EXECUTE, }, { .path = dir_s2d2, .access = LANDLOCK_ACCESS_FS_REFER | LANDLOCK_ACCESS_FS_EXECUTE | LANDLOCK_ACCESS_FS_MAKE_SOCK, }, { .path = dir_s2d3, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_MAKE_FIFO, }, {}, }; int ruleset_fd = create_ruleset(_metadata, LANDLOCK_ACCESS_FS_REFER | LANDLOCK_ACCESS_FS_EXECUTE | LANDLOCK_ACCESS_FS_MAKE_SOCK | LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_MAKE_FIFO, layer1); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(-1, rename(file1_s1d2, file1_s2d1)); ASSERT_EQ(EXDEV, errno); /* * Moving file1_s1d2 beneath dir_s2d3 would grant it the READ_FILE * access right. */ ASSERT_EQ(-1, rename(file1_s1d2, file1_s2d3)); ASSERT_EQ(EXDEV, errno); /* * Moving file1_s1d2 should be allowed even if dir_s2d2 grants a * superset of access rights compared to dir_s1d2, because file1_s1d2 * already has these access rights anyway. */ ASSERT_EQ(0, rename(file1_s1d2, file1_s2d2)); ASSERT_EQ(0, rename(file1_s2d2, file1_s1d2)); ASSERT_EQ(-1, rename(dir_s1d3, file1_s2d1)); ASSERT_EQ(EXDEV, errno); /* * Moving dir_s1d3 beneath dir_s2d3 would grant it the MAKE_FIFO access * right. */ ASSERT_EQ(-1, rename(dir_s1d3, file1_s2d3)); ASSERT_EQ(EXDEV, errno); /* * Moving dir_s1d3 should be allowed even if dir_s2d2 grants a superset * of access rights compared to dir_s1d2, because dir_s1d3 already has * these access rights anyway. */ ASSERT_EQ(0, rename(dir_s1d3, file1_s2d2)); ASSERT_EQ(0, rename(file1_s2d2, dir_s1d3)); /* * Moving file1_s2d3 beneath dir_s1d2 is allowed, but moving it back * will be denied because the new inherited access rights from dir_s1d2 * will be less than the destination (original) dir_s2d3. This is a * sinkhole scenario where we cannot move back files or directories. */ ASSERT_EQ(0, rename(file1_s2d3, file2_s1d2)); ASSERT_EQ(-1, rename(file2_s1d2, file1_s2d3)); ASSERT_EQ(EXDEV, errno); ASSERT_EQ(0, unlink(file2_s1d2)); ASSERT_EQ(0, unlink(file2_s2d3)); /* * Checks similar directory one-way move: dir_s2d3 loses EXECUTE and * MAKE_SOCK which were inherited from dir_s1d3. */ ASSERT_EQ(0, rename(dir_s2d3, file2_s1d2)); ASSERT_EQ(-1, rename(file2_s1d2, dir_s2d3)); ASSERT_EQ(EXDEV, errno); } TEST_F_FORK(layout1, remove_dir) { const struct rule rules[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_REMOVE_DIR, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, rules[0].access, rules); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(0, unlink(file1_s1d1)); ASSERT_EQ(0, unlink(file1_s1d2)); ASSERT_EQ(0, unlink(file1_s1d3)); ASSERT_EQ(0, unlink(file2_s1d3)); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(0, rmdir(dir_s1d3)); ASSERT_EQ(0, mkdir(dir_s1d3, 0700)); ASSERT_EQ(0, unlinkat(AT_FDCWD, dir_s1d3, AT_REMOVEDIR)); /* dir_s1d2 itself cannot be removed. */ ASSERT_EQ(-1, rmdir(dir_s1d2)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, unlinkat(AT_FDCWD, dir_s1d2, AT_REMOVEDIR)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, rmdir(dir_s1d1)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, unlinkat(AT_FDCWD, dir_s1d1, AT_REMOVEDIR)); ASSERT_EQ(EACCES, errno); } TEST_F_FORK(layout1, remove_file) { const struct rule rules[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_REMOVE_FILE, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, rules[0].access, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(-1, unlink(file1_s1d1)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, unlinkat(AT_FDCWD, file1_s1d1, 0)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(0, unlink(file1_s1d2)); ASSERT_EQ(0, unlinkat(AT_FDCWD, file1_s1d3, 0)); } static void test_make_file(struct __test_metadata *const _metadata, const __u64 access, const mode_t mode, const dev_t dev) { const struct rule rules[] = { { .path = dir_s1d2, .access = access, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, access, rules); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(0, unlink(file1_s1d1)); ASSERT_EQ(0, unlink(file2_s1d1)); ASSERT_EQ(0, mknod(file2_s1d1, mode | 0400, dev)) { TH_LOG("Failed to make file \"%s\": %s", file2_s1d1, strerror(errno)); }; ASSERT_EQ(0, unlink(file1_s1d2)); ASSERT_EQ(0, unlink(file2_s1d2)); ASSERT_EQ(0, unlink(file1_s1d3)); ASSERT_EQ(0, unlink(file2_s1d3)); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(-1, mknod(file1_s1d1, mode | 0400, dev)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, link(file2_s1d1, file1_s1d1)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, rename(file2_s1d1, file1_s1d1)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(0, mknod(file1_s1d2, mode | 0400, dev)) { TH_LOG("Failed to make file \"%s\": %s", file1_s1d2, strerror(errno)); }; ASSERT_EQ(0, link(file1_s1d2, file2_s1d2)); ASSERT_EQ(0, unlink(file2_s1d2)); ASSERT_EQ(0, rename(file1_s1d2, file2_s1d2)); ASSERT_EQ(0, mknod(file1_s1d3, mode | 0400, dev)); ASSERT_EQ(0, link(file1_s1d3, file2_s1d3)); ASSERT_EQ(0, unlink(file2_s1d3)); ASSERT_EQ(0, rename(file1_s1d3, file2_s1d3)); } TEST_F_FORK(layout1, make_char) { /* Creates a /dev/null device. */ set_cap(_metadata, CAP_MKNOD); test_make_file(_metadata, LANDLOCK_ACCESS_FS_MAKE_CHAR, S_IFCHR, makedev(1, 3)); } TEST_F_FORK(layout1, make_block) { /* Creates a /dev/loop0 device. */ set_cap(_metadata, CAP_MKNOD); test_make_file(_metadata, LANDLOCK_ACCESS_FS_MAKE_BLOCK, S_IFBLK, makedev(7, 0)); } TEST_F_FORK(layout1, make_reg_1) { test_make_file(_metadata, LANDLOCK_ACCESS_FS_MAKE_REG, S_IFREG, 0); } TEST_F_FORK(layout1, make_reg_2) { test_make_file(_metadata, LANDLOCK_ACCESS_FS_MAKE_REG, 0, 0); } TEST_F_FORK(layout1, make_sock) { test_make_file(_metadata, LANDLOCK_ACCESS_FS_MAKE_SOCK, S_IFSOCK, 0); } TEST_F_FORK(layout1, make_fifo) { test_make_file(_metadata, LANDLOCK_ACCESS_FS_MAKE_FIFO, S_IFIFO, 0); } TEST_F_FORK(layout1, make_sym) { const struct rule rules[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_MAKE_SYM, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, rules[0].access, rules); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(0, unlink(file1_s1d1)); ASSERT_EQ(0, unlink(file2_s1d1)); ASSERT_EQ(0, symlink("none", file2_s1d1)); ASSERT_EQ(0, unlink(file1_s1d2)); ASSERT_EQ(0, unlink(file2_s1d2)); ASSERT_EQ(0, unlink(file1_s1d3)); ASSERT_EQ(0, unlink(file2_s1d3)); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(-1, symlink("none", file1_s1d1)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, link(file2_s1d1, file1_s1d1)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(-1, rename(file2_s1d1, file1_s1d1)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(0, symlink("none", file1_s1d2)); ASSERT_EQ(0, link(file1_s1d2, file2_s1d2)); ASSERT_EQ(0, unlink(file2_s1d2)); ASSERT_EQ(0, rename(file1_s1d2, file2_s1d2)); ASSERT_EQ(0, symlink("none", file1_s1d3)); ASSERT_EQ(0, link(file1_s1d3, file2_s1d3)); ASSERT_EQ(0, unlink(file2_s1d3)); ASSERT_EQ(0, rename(file1_s1d3, file2_s1d3)); } TEST_F_FORK(layout1, make_dir) { const struct rule rules[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_MAKE_DIR, }, {}, }; const int ruleset_fd = create_ruleset(_metadata, rules[0].access, rules); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(0, unlink(file1_s1d1)); ASSERT_EQ(0, unlink(file1_s1d2)); ASSERT_EQ(0, unlink(file1_s1d3)); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Uses file_* as directory names. */ ASSERT_EQ(-1, mkdir(file1_s1d1, 0700)); ASSERT_EQ(EACCES, errno); ASSERT_EQ(0, mkdir(file1_s1d2, 0700)); ASSERT_EQ(0, mkdir(file1_s1d3, 0700)); } static int open_proc_fd(struct __test_metadata *const _metadata, const int fd, const int open_flags) { static const char path_template[] = "/proc/self/fd/%d"; char procfd_path[sizeof(path_template) + 10]; const int procfd_path_size = snprintf(procfd_path, sizeof(procfd_path), path_template, fd); ASSERT_LT(procfd_path_size, sizeof(procfd_path)); return open(procfd_path, open_flags); } TEST_F_FORK(layout1, proc_unlinked_file) { const struct rule rules[] = { { .path = file1_s1d2, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, {}, }; int reg_fd, proc_fd; const int ruleset_fd = create_ruleset( _metadata, LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); ASSERT_EQ(EACCES, test_open(file1_s1d2, O_RDWR)); ASSERT_EQ(0, test_open(file1_s1d2, O_RDONLY)); reg_fd = open(file1_s1d2, O_RDONLY | O_CLOEXEC); ASSERT_LE(0, reg_fd); ASSERT_EQ(0, unlink(file1_s1d2)); proc_fd = open_proc_fd(_metadata, reg_fd, O_RDONLY | O_CLOEXEC); ASSERT_LE(0, proc_fd); ASSERT_EQ(0, close(proc_fd)); proc_fd = open_proc_fd(_metadata, reg_fd, O_RDWR | O_CLOEXEC); ASSERT_EQ(-1, proc_fd) { TH_LOG("Successfully opened /proc/self/fd/%d: %s", reg_fd, strerror(errno)); } ASSERT_EQ(EACCES, errno); ASSERT_EQ(0, close(reg_fd)); } TEST_F_FORK(layout1, proc_pipe) { int proc_fd; int pipe_fds[2]; char buf = '\0'; const struct rule rules[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, }, {}, }; /* Limits read and write access to files tied to the filesystem. */ const int ruleset_fd = create_ruleset(_metadata, rules[0].access, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks enforcement for normal files. */ ASSERT_EQ(0, test_open(file1_s1d2, O_RDWR)); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_RDWR)); /* Checks access to pipes through FD. */ ASSERT_EQ(0, pipe2(pipe_fds, O_CLOEXEC)); ASSERT_EQ(1, write(pipe_fds[1], ".", 1)) { TH_LOG("Failed to write in pipe: %s", strerror(errno)); } ASSERT_EQ(1, read(pipe_fds[0], &buf, 1)); ASSERT_EQ('.', buf); /* Checks write access to pipe through /proc/self/fd . */ proc_fd = open_proc_fd(_metadata, pipe_fds[1], O_WRONLY | O_CLOEXEC); ASSERT_LE(0, proc_fd); ASSERT_EQ(1, write(proc_fd, ".", 1)) { TH_LOG("Failed to write through /proc/self/fd/%d: %s", pipe_fds[1], strerror(errno)); } ASSERT_EQ(0, close(proc_fd)); /* Checks read access to pipe through /proc/self/fd . */ proc_fd = open_proc_fd(_metadata, pipe_fds[0], O_RDONLY | O_CLOEXEC); ASSERT_LE(0, proc_fd); buf = '\0'; ASSERT_EQ(1, read(proc_fd, &buf, 1)) { TH_LOG("Failed to read through /proc/self/fd/%d: %s", pipe_fds[1], strerror(errno)); } ASSERT_EQ(0, close(proc_fd)); ASSERT_EQ(0, close(pipe_fds[0])); ASSERT_EQ(0, close(pipe_fds[1])); } /* Invokes truncate(2) and returns its errno or 0. */ static int test_truncate(const char *const path) { if (truncate(path, 10) < 0) return errno; return 0; } /* * Invokes creat(2) and returns its errno or 0. * Closes the opened file descriptor on success. */ static int test_creat(const char *const path) { int fd = creat(path, 0600); if (fd < 0) return errno; /* * Mixing error codes from close(2) and creat(2) should not lead to any * (access type) confusion for this test. */ if (close(fd) < 0) return errno; return 0; } /* * Exercises file truncation when it's not restricted, * as it was the case before LANDLOCK_ACCESS_FS_TRUNCATE existed. */ TEST_F_FORK(layout1, truncate_unhandled) { const char *const file_r = file1_s1d1; const char *const file_w = file2_s1d1; const char *const file_none = file1_s1d2; const struct rule rules[] = { { .path = file_r, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = file_w, .access = LANDLOCK_ACCESS_FS_WRITE_FILE, }, /* Implicitly: No rights for file_none. */ {}, }; const __u64 handled = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE; int ruleset_fd; /* Enable Landlock. */ ruleset_fd = create_ruleset(_metadata, handled, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* * Checks read right: truncate and open with O_TRUNC work, unless the * file is attempted to be opened for writing. */ EXPECT_EQ(0, test_truncate(file_r)); EXPECT_EQ(0, test_open(file_r, O_RDONLY | O_TRUNC)); EXPECT_EQ(EACCES, test_open(file_r, O_WRONLY | O_TRUNC)); EXPECT_EQ(EACCES, test_creat(file_r)); /* * Checks write right: truncate and open with O_TRUNC work, unless the * file is attempted to be opened for reading. */ EXPECT_EQ(0, test_truncate(file_w)); EXPECT_EQ(EACCES, test_open(file_w, O_RDONLY | O_TRUNC)); EXPECT_EQ(0, test_open(file_w, O_WRONLY | O_TRUNC)); EXPECT_EQ(0, test_creat(file_w)); /* * Checks "no rights" case: truncate works but all open attempts fail, * including creat. */ EXPECT_EQ(0, test_truncate(file_none)); EXPECT_EQ(EACCES, test_open(file_none, O_RDONLY | O_TRUNC)); EXPECT_EQ(EACCES, test_open(file_none, O_WRONLY | O_TRUNC)); EXPECT_EQ(EACCES, test_creat(file_none)); } TEST_F_FORK(layout1, truncate) { const char *const file_rwt = file1_s1d1; const char *const file_rw = file2_s1d1; const char *const file_rt = file1_s1d2; const char *const file_t = file2_s1d2; const char *const file_none = file1_s1d3; const char *const dir_t = dir_s2d1; const char *const file_in_dir_t = file1_s2d1; const char *const dir_w = dir_s3d1; const char *const file_in_dir_w = file1_s3d1; const struct rule rules[] = { { .path = file_rwt, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_TRUNCATE, }, { .path = file_rw, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, }, { .path = file_rt, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_TRUNCATE, }, { .path = file_t, .access = LANDLOCK_ACCESS_FS_TRUNCATE, }, /* Implicitly: No access rights for file_none. */ { .path = dir_t, .access = LANDLOCK_ACCESS_FS_TRUNCATE, }, { .path = dir_w, .access = LANDLOCK_ACCESS_FS_WRITE_FILE, }, {}, }; const __u64 handled = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_TRUNCATE; int ruleset_fd; /* Enable Landlock. */ ruleset_fd = create_ruleset(_metadata, handled, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks read, write and truncate rights: truncation works. */ EXPECT_EQ(0, test_truncate(file_rwt)); EXPECT_EQ(0, test_open(file_rwt, O_RDONLY | O_TRUNC)); EXPECT_EQ(0, test_open(file_rwt, O_WRONLY | O_TRUNC)); /* Checks read and write rights: no truncate variant works. */ EXPECT_EQ(EACCES, test_truncate(file_rw)); EXPECT_EQ(EACCES, test_open(file_rw, O_RDONLY | O_TRUNC)); EXPECT_EQ(EACCES, test_open(file_rw, O_WRONLY | O_TRUNC)); /* * Checks read and truncate rights: truncation works. * * Note: Files can get truncated using open() even with O_RDONLY. */ EXPECT_EQ(0, test_truncate(file_rt)); EXPECT_EQ(0, test_open(file_rt, O_RDONLY | O_TRUNC)); EXPECT_EQ(EACCES, test_open(file_rt, O_WRONLY | O_TRUNC)); /* Checks truncate right: truncate works, but can't open file. */ EXPECT_EQ(0, test_truncate(file_t)); EXPECT_EQ(EACCES, test_open(file_t, O_RDONLY | O_TRUNC)); EXPECT_EQ(EACCES, test_open(file_t, O_WRONLY | O_TRUNC)); /* Checks "no rights" case: No form of truncation works. */ EXPECT_EQ(EACCES, test_truncate(file_none)); EXPECT_EQ(EACCES, test_open(file_none, O_RDONLY | O_TRUNC)); EXPECT_EQ(EACCES, test_open(file_none, O_WRONLY | O_TRUNC)); /* * Checks truncate right on directory: truncate works on contained * files. */ EXPECT_EQ(0, test_truncate(file_in_dir_t)); EXPECT_EQ(EACCES, test_open(file_in_dir_t, O_RDONLY | O_TRUNC)); EXPECT_EQ(EACCES, test_open(file_in_dir_t, O_WRONLY | O_TRUNC)); /* * Checks creat in dir_w: This requires the truncate right when * overwriting an existing file, but does not require it when the file * is new. */ EXPECT_EQ(EACCES, test_creat(file_in_dir_w)); ASSERT_EQ(0, unlink(file_in_dir_w)); EXPECT_EQ(0, test_creat(file_in_dir_w)); } /* Invokes ftruncate(2) and returns its errno or 0. */ static int test_ftruncate(int fd) { if (ftruncate(fd, 10) < 0) return errno; return 0; } TEST_F_FORK(layout1, ftruncate) { /* * This test opens a new file descriptor at different stages of * Landlock restriction: * * without restriction: ftruncate works * something else but truncate restricted: ftruncate works * truncate restricted and permitted: ftruncate works * truncate restricted and not permitted: ftruncate fails * * Whether this works or not is expected to depend on the time when the * FD was opened, not to depend on the time when ftruncate() was * called. */ const char *const path = file1_s1d1; const __u64 handled1 = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE; const struct rule layer1[] = { { .path = path, .access = LANDLOCK_ACCESS_FS_WRITE_FILE, }, {}, }; const __u64 handled2 = LANDLOCK_ACCESS_FS_TRUNCATE; const struct rule layer2[] = { { .path = path, .access = LANDLOCK_ACCESS_FS_TRUNCATE, }, {}, }; const __u64 handled3 = LANDLOCK_ACCESS_FS_TRUNCATE | LANDLOCK_ACCESS_FS_WRITE_FILE; const struct rule layer3[] = { { .path = path, .access = LANDLOCK_ACCESS_FS_WRITE_FILE, }, {}, }; int fd_layer0, fd_layer1, fd_layer2, fd_layer3, ruleset_fd; fd_layer0 = open(path, O_WRONLY); EXPECT_EQ(0, test_ftruncate(fd_layer0)); ruleset_fd = create_ruleset(_metadata, handled1, layer1); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); fd_layer1 = open(path, O_WRONLY); EXPECT_EQ(0, test_ftruncate(fd_layer0)); EXPECT_EQ(0, test_ftruncate(fd_layer1)); ruleset_fd = create_ruleset(_metadata, handled2, layer2); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); fd_layer2 = open(path, O_WRONLY); EXPECT_EQ(0, test_ftruncate(fd_layer0)); EXPECT_EQ(0, test_ftruncate(fd_layer1)); EXPECT_EQ(0, test_ftruncate(fd_layer2)); ruleset_fd = create_ruleset(_metadata, handled3, layer3); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); fd_layer3 = open(path, O_WRONLY); EXPECT_EQ(0, test_ftruncate(fd_layer0)); EXPECT_EQ(0, test_ftruncate(fd_layer1)); EXPECT_EQ(0, test_ftruncate(fd_layer2)); EXPECT_EQ(EACCES, test_ftruncate(fd_layer3)); ASSERT_EQ(0, close(fd_layer0)); ASSERT_EQ(0, close(fd_layer1)); ASSERT_EQ(0, close(fd_layer2)); ASSERT_EQ(0, close(fd_layer3)); } /* clang-format off */ FIXTURE(ftruncate) {}; /* clang-format on */ FIXTURE_SETUP(ftruncate) { prepare_layout(_metadata); create_file(_metadata, file1_s1d1); } FIXTURE_TEARDOWN(ftruncate) { EXPECT_EQ(0, remove_path(file1_s1d1)); cleanup_layout(_metadata); } FIXTURE_VARIANT(ftruncate) { const __u64 handled; const __u64 allowed; const int expected_open_result; const int expected_ftruncate_result; }; /* clang-format off */ FIXTURE_VARIANT_ADD(ftruncate, w_w) { /* clang-format on */ .handled = LANDLOCK_ACCESS_FS_WRITE_FILE, .allowed = LANDLOCK_ACCESS_FS_WRITE_FILE, .expected_open_result = 0, .expected_ftruncate_result = 0, }; /* clang-format off */ FIXTURE_VARIANT_ADD(ftruncate, t_t) { /* clang-format on */ .handled = LANDLOCK_ACCESS_FS_TRUNCATE, .allowed = LANDLOCK_ACCESS_FS_TRUNCATE, .expected_open_result = 0, .expected_ftruncate_result = 0, }; /* clang-format off */ FIXTURE_VARIANT_ADD(ftruncate, wt_w) { /* clang-format on */ .handled = LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_TRUNCATE, .allowed = LANDLOCK_ACCESS_FS_WRITE_FILE, .expected_open_result = 0, .expected_ftruncate_result = EACCES, }; /* clang-format off */ FIXTURE_VARIANT_ADD(ftruncate, wt_wt) { /* clang-format on */ .handled = LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_TRUNCATE, .allowed = LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_TRUNCATE, .expected_open_result = 0, .expected_ftruncate_result = 0, }; /* clang-format off */ FIXTURE_VARIANT_ADD(ftruncate, wt_t) { /* clang-format on */ .handled = LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_TRUNCATE, .allowed = LANDLOCK_ACCESS_FS_TRUNCATE, .expected_open_result = EACCES, }; TEST_F_FORK(ftruncate, open_and_ftruncate) { const char *const path = file1_s1d1; const struct rule rules[] = { { .path = path, .access = variant->allowed, }, {}, }; int fd, ruleset_fd; /* Enable Landlock. */ ruleset_fd = create_ruleset(_metadata, variant->handled, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); fd = open(path, O_WRONLY); EXPECT_EQ(variant->expected_open_result, (fd < 0 ? errno : 0)); if (fd >= 0) { EXPECT_EQ(variant->expected_ftruncate_result, test_ftruncate(fd)); ASSERT_EQ(0, close(fd)); } } TEST_F_FORK(ftruncate, open_and_ftruncate_in_different_processes) { int child, fd, status; int socket_fds[2]; ASSERT_EQ(0, socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, socket_fds)); child = fork(); ASSERT_LE(0, child); if (child == 0) { /* * Enables Landlock in the child process, open a file descriptor * where truncation is forbidden and send it to the * non-landlocked parent process. */ const char *const path = file1_s1d1; const struct rule rules[] = { { .path = path, .access = variant->allowed, }, {}, }; int fd, ruleset_fd; ruleset_fd = create_ruleset(_metadata, variant->handled, rules); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); fd = open(path, O_WRONLY); ASSERT_EQ(variant->expected_open_result, (fd < 0 ? errno : 0)); if (fd >= 0) { ASSERT_EQ(0, send_fd(socket_fds[0], fd)); ASSERT_EQ(0, close(fd)); } ASSERT_EQ(0, close(socket_fds[0])); _exit(_metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE); return; } if (variant->expected_open_result == 0) { fd = recv_fd(socket_fds[1]); ASSERT_LE(0, fd); EXPECT_EQ(variant->expected_ftruncate_result, test_ftruncate(fd)); ASSERT_EQ(0, close(fd)); } ASSERT_EQ(child, waitpid(child, &status, 0)); ASSERT_EQ(1, WIFEXITED(status)); ASSERT_EQ(EXIT_SUCCESS, WEXITSTATUS(status)); ASSERT_EQ(0, close(socket_fds[0])); ASSERT_EQ(0, close(socket_fds[1])); } TEST(memfd_ftruncate) { int fd; fd = memfd_create("name", MFD_CLOEXEC); ASSERT_LE(0, fd); /* * Checks that ftruncate is permitted on file descriptors that are * created in ways other than open(2). */ EXPECT_EQ(0, test_ftruncate(fd)); ASSERT_EQ(0, close(fd)); } /* clang-format off */ FIXTURE(layout1_bind) {}; /* clang-format on */ FIXTURE_SETUP(layout1_bind) { prepare_layout(_metadata); create_layout1(_metadata); set_cap(_metadata, CAP_SYS_ADMIN); ASSERT_EQ(0, mount(dir_s1d2, dir_s2d2, NULL, MS_BIND, NULL)); clear_cap(_metadata, CAP_SYS_ADMIN); } FIXTURE_TEARDOWN(layout1_bind) { set_cap(_metadata, CAP_SYS_ADMIN); EXPECT_EQ(0, umount(dir_s2d2)); clear_cap(_metadata, CAP_SYS_ADMIN); remove_layout1(_metadata); cleanup_layout(_metadata); } static const char bind_dir_s1d3[] = TMP_DIR "/s2d1/s2d2/s1d3"; static const char bind_file1_s1d3[] = TMP_DIR "/s2d1/s2d2/s1d3/f1"; /* * layout1_bind hierarchy: * * tmp * ├── s1d1 * │ ├── f1 * │ ├── f2 * │ └── s1d2 * │ ├── f1 * │ ├── f2 * │ └── s1d3 * │ ├── f1 * │ └── f2 * ├── s2d1 * │ ├── f1 * │ └── s2d2 * │ ├── f1 * │ ├── f2 * │ └── s1d3 * │ ├── f1 * │ └── f2 * └── s3d1 * └── s3d2 * └── s3d3 */ TEST_F_FORK(layout1_bind, no_restriction) { ASSERT_EQ(0, test_open(dir_s1d1, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d1, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s1d2, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d2, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s1d3, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s1d3, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s2d1, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s2d1, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s2d2, O_RDONLY)); ASSERT_EQ(0, test_open(file1_s2d2, O_RDONLY)); ASSERT_EQ(ENOENT, test_open(dir_s2d3, O_RDONLY)); ASSERT_EQ(ENOENT, test_open(file1_s2d3, O_RDONLY)); ASSERT_EQ(0, test_open(bind_dir_s1d3, O_RDONLY)); ASSERT_EQ(0, test_open(bind_file1_s1d3, O_RDONLY)); ASSERT_EQ(0, test_open(dir_s3d1, O_RDONLY)); } TEST_F_FORK(layout1_bind, same_content_same_file) { /* * Sets access right on parent directories of both source and * destination mount points. */ const struct rule layer1_parent[] = { { .path = dir_s1d1, .access = ACCESS_RO, }, { .path = dir_s2d1, .access = ACCESS_RW, }, {}, }; /* * Sets access rights on the same bind-mounted directories. The result * should be ACCESS_RW for both directories, but not both hierarchies * because of the first layer. */ const struct rule layer2_mount_point[] = { { .path = dir_s1d2, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = dir_s2d2, .access = ACCESS_RW, }, {}, }; /* Only allow read-access to the s1d3 hierarchies. */ const struct rule layer3_source[] = { { .path = dir_s1d3, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, {}, }; /* Removes all access rights. */ const struct rule layer4_destination[] = { { .path = bind_file1_s1d3, .access = LANDLOCK_ACCESS_FS_WRITE_FILE, }, {}, }; int ruleset_fd; /* Sets rules for the parent directories. */ ruleset_fd = create_ruleset(_metadata, ACCESS_RW, layer1_parent); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks source hierarchy. */ ASSERT_EQ(0, test_open(file1_s1d1, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_WRONLY)); ASSERT_EQ(0, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); ASSERT_EQ(0, test_open(file1_s1d2, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d2, O_WRONLY)); ASSERT_EQ(0, test_open(dir_s1d2, O_RDONLY | O_DIRECTORY)); /* Checks destination hierarchy. */ ASSERT_EQ(0, test_open(file1_s2d1, O_RDWR)); ASSERT_EQ(0, test_open(dir_s2d1, O_RDONLY | O_DIRECTORY)); ASSERT_EQ(0, test_open(file1_s2d2, O_RDWR)); ASSERT_EQ(0, test_open(dir_s2d2, O_RDONLY | O_DIRECTORY)); /* Sets rules for the mount points. */ ruleset_fd = create_ruleset(_metadata, ACCESS_RW, layer2_mount_point); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks source hierarchy. */ ASSERT_EQ(EACCES, test_open(file1_s1d1, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d1, O_WRONLY)); ASSERT_EQ(EACCES, test_open(dir_s1d1, O_RDONLY | O_DIRECTORY)); ASSERT_EQ(0, test_open(file1_s1d2, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d2, O_WRONLY)); ASSERT_EQ(0, test_open(dir_s1d2, O_RDONLY | O_DIRECTORY)); /* Checks destination hierarchy. */ ASSERT_EQ(EACCES, test_open(file1_s2d1, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s2d1, O_WRONLY)); ASSERT_EQ(EACCES, test_open(dir_s2d1, O_RDONLY | O_DIRECTORY)); ASSERT_EQ(0, test_open(file1_s2d2, O_RDWR)); ASSERT_EQ(0, test_open(dir_s2d2, O_RDONLY | O_DIRECTORY)); ASSERT_EQ(0, test_open(bind_dir_s1d3, O_RDONLY | O_DIRECTORY)); /* Sets a (shared) rule only on the source. */ ruleset_fd = create_ruleset(_metadata, ACCESS_RW, layer3_source); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks source hierarchy. */ ASSERT_EQ(EACCES, test_open(file1_s1d2, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d2, O_WRONLY)); ASSERT_EQ(EACCES, test_open(dir_s1d2, O_RDONLY | O_DIRECTORY)); ASSERT_EQ(0, test_open(file1_s1d3, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d3, O_WRONLY)); ASSERT_EQ(EACCES, test_open(dir_s1d3, O_RDONLY | O_DIRECTORY)); /* Checks destination hierarchy. */ ASSERT_EQ(EACCES, test_open(file1_s2d2, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s2d2, O_WRONLY)); ASSERT_EQ(EACCES, test_open(dir_s2d2, O_RDONLY | O_DIRECTORY)); ASSERT_EQ(0, test_open(bind_file1_s1d3, O_RDONLY)); ASSERT_EQ(EACCES, test_open(bind_file1_s1d3, O_WRONLY)); ASSERT_EQ(EACCES, test_open(bind_dir_s1d3, O_RDONLY | O_DIRECTORY)); /* Sets a (shared) rule only on the destination. */ ruleset_fd = create_ruleset(_metadata, ACCESS_RW, layer4_destination); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks source hierarchy. */ ASSERT_EQ(EACCES, test_open(file1_s1d3, O_RDONLY)); ASSERT_EQ(EACCES, test_open(file1_s1d3, O_WRONLY)); /* Checks destination hierarchy. */ ASSERT_EQ(EACCES, test_open(bind_file1_s1d3, O_RDONLY)); ASSERT_EQ(EACCES, test_open(bind_file1_s1d3, O_WRONLY)); } TEST_F_FORK(layout1_bind, reparent_cross_mount) { const struct rule layer1[] = { { /* dir_s2d1 is beneath the dir_s2d2 mount point. */ .path = dir_s2d1, .access = LANDLOCK_ACCESS_FS_REFER, }, { .path = bind_dir_s1d3, .access = LANDLOCK_ACCESS_FS_EXECUTE, }, {}, }; int ruleset_fd = create_ruleset( _metadata, LANDLOCK_ACCESS_FS_REFER | LANDLOCK_ACCESS_FS_EXECUTE, layer1); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks basic denied move. */ ASSERT_EQ(-1, rename(file1_s1d1, file1_s1d2)); ASSERT_EQ(EXDEV, errno); /* Checks real cross-mount move (Landlock is not involved). */ ASSERT_EQ(-1, rename(file1_s2d1, file1_s2d2)); ASSERT_EQ(EXDEV, errno); /* Checks move that will give more accesses. */ ASSERT_EQ(-1, rename(file1_s2d2, bind_file1_s1d3)); ASSERT_EQ(EXDEV, errno); /* Checks legitimate downgrade move. */ ASSERT_EQ(0, rename(bind_file1_s1d3, file1_s2d2)); } #define LOWER_BASE TMP_DIR "/lower" #define LOWER_DATA LOWER_BASE "/data" static const char lower_fl1[] = LOWER_DATA "/fl1"; static const char lower_dl1[] = LOWER_DATA "/dl1"; static const char lower_dl1_fl2[] = LOWER_DATA "/dl1/fl2"; static const char lower_fo1[] = LOWER_DATA "/fo1"; static const char lower_do1[] = LOWER_DATA "/do1"; static const char lower_do1_fo2[] = LOWER_DATA "/do1/fo2"; static const char lower_do1_fl3[] = LOWER_DATA "/do1/fl3"; static const char (*lower_base_files[])[] = { &lower_fl1, &lower_fo1, NULL, }; static const char (*lower_base_directories[])[] = { &lower_dl1, &lower_do1, NULL, }; static const char (*lower_sub_files[])[] = { &lower_dl1_fl2, &lower_do1_fo2, &lower_do1_fl3, NULL, }; #define UPPER_BASE TMP_DIR "/upper" #define UPPER_DATA UPPER_BASE "/data" #define UPPER_WORK UPPER_BASE "/work" static const char upper_fu1[] = UPPER_DATA "/fu1"; static const char upper_du1[] = UPPER_DATA "/du1"; static const char upper_du1_fu2[] = UPPER_DATA "/du1/fu2"; static const char upper_fo1[] = UPPER_DATA "/fo1"; static const char upper_do1[] = UPPER_DATA "/do1"; static const char upper_do1_fo2[] = UPPER_DATA "/do1/fo2"; static const char upper_do1_fu3[] = UPPER_DATA "/do1/fu3"; static const char (*upper_base_files[])[] = { &upper_fu1, &upper_fo1, NULL, }; static const char (*upper_base_directories[])[] = { &upper_du1, &upper_do1, NULL, }; static const char (*upper_sub_files[])[] = { &upper_du1_fu2, &upper_do1_fo2, &upper_do1_fu3, NULL, }; #define MERGE_BASE TMP_DIR "/merge" #define MERGE_DATA MERGE_BASE "/data" static const char merge_fl1[] = MERGE_DATA "/fl1"; static const char merge_dl1[] = MERGE_DATA "/dl1"; static const char merge_dl1_fl2[] = MERGE_DATA "/dl1/fl2"; static const char merge_fu1[] = MERGE_DATA "/fu1"; static const char merge_du1[] = MERGE_DATA "/du1"; static const char merge_du1_fu2[] = MERGE_DATA "/du1/fu2"; static const char merge_fo1[] = MERGE_DATA "/fo1"; static const char merge_do1[] = MERGE_DATA "/do1"; static const char merge_do1_fo2[] = MERGE_DATA "/do1/fo2"; static const char merge_do1_fl3[] = MERGE_DATA "/do1/fl3"; static const char merge_do1_fu3[] = MERGE_DATA "/do1/fu3"; static const char (*merge_base_files[])[] = { &merge_fl1, &merge_fu1, &merge_fo1, NULL, }; static const char (*merge_base_directories[])[] = { &merge_dl1, &merge_du1, &merge_do1, NULL, }; static const char (*merge_sub_files[])[] = { &merge_dl1_fl2, &merge_du1_fu2, &merge_do1_fo2, &merge_do1_fl3, &merge_do1_fu3, NULL, }; /* * layout2_overlay hierarchy: * * tmp * ├── lower * │ └── data * │ ├── dl1 * │ │ └── fl2 * │ ├── do1 * │ │ ├── fl3 * │ │ └── fo2 * │ ├── fl1 * │ └── fo1 * ├── merge * │ └── data * │ ├── dl1 * │ │ └── fl2 * │ ├── do1 * │ │ ├── fl3 * │ │ ├── fo2 * │ │ └── fu3 * │ ├── du1 * │ │ └── fu2 * │ ├── fl1 * │ ├── fo1 * │ └── fu1 * └── upper * ├── data * │ ├── do1 * │ │ ├── fo2 * │ │ └── fu3 * │ ├── du1 * │ │ └── fu2 * │ ├── fo1 * │ └── fu1 * └── work * └── work */ FIXTURE(layout2_overlay) { bool skip_test; }; FIXTURE_SETUP(layout2_overlay) { if (!supports_filesystem("overlay")) { self->skip_test = true; SKIP(return, "overlayfs is not supported (setup)"); } prepare_layout(_metadata); create_directory(_metadata, LOWER_BASE); set_cap(_metadata, CAP_SYS_ADMIN); /* Creates tmpfs mount points to get deterministic overlayfs. */ ASSERT_EQ(0, mount_opt(&mnt_tmp, LOWER_BASE)); clear_cap(_metadata, CAP_SYS_ADMIN); create_file(_metadata, lower_fl1); create_file(_metadata, lower_dl1_fl2); create_file(_metadata, lower_fo1); create_file(_metadata, lower_do1_fo2); create_file(_metadata, lower_do1_fl3); create_directory(_metadata, UPPER_BASE); set_cap(_metadata, CAP_SYS_ADMIN); ASSERT_EQ(0, mount_opt(&mnt_tmp, UPPER_BASE)); clear_cap(_metadata, CAP_SYS_ADMIN); create_file(_metadata, upper_fu1); create_file(_metadata, upper_du1_fu2); create_file(_metadata, upper_fo1); create_file(_metadata, upper_do1_fo2); create_file(_metadata, upper_do1_fu3); ASSERT_EQ(0, mkdir(UPPER_WORK, 0700)); create_directory(_metadata, MERGE_DATA); set_cap(_metadata, CAP_SYS_ADMIN); set_cap(_metadata, CAP_DAC_OVERRIDE); ASSERT_EQ(0, mount("overlay", MERGE_DATA, "overlay", 0, "lowerdir=" LOWER_DATA ",upperdir=" UPPER_DATA ",workdir=" UPPER_WORK)); clear_cap(_metadata, CAP_DAC_OVERRIDE); clear_cap(_metadata, CAP_SYS_ADMIN); } FIXTURE_TEARDOWN(layout2_overlay) { if (self->skip_test) SKIP(return, "overlayfs is not supported (teardown)"); EXPECT_EQ(0, remove_path(lower_do1_fl3)); EXPECT_EQ(0, remove_path(lower_dl1_fl2)); EXPECT_EQ(0, remove_path(lower_fl1)); EXPECT_EQ(0, remove_path(lower_do1_fo2)); EXPECT_EQ(0, remove_path(lower_fo1)); set_cap(_metadata, CAP_SYS_ADMIN); EXPECT_EQ(0, umount(LOWER_BASE)); clear_cap(_metadata, CAP_SYS_ADMIN); EXPECT_EQ(0, remove_path(LOWER_BASE)); EXPECT_EQ(0, remove_path(upper_do1_fu3)); EXPECT_EQ(0, remove_path(upper_du1_fu2)); EXPECT_EQ(0, remove_path(upper_fu1)); EXPECT_EQ(0, remove_path(upper_do1_fo2)); EXPECT_EQ(0, remove_path(upper_fo1)); EXPECT_EQ(0, remove_path(UPPER_WORK "/work")); set_cap(_metadata, CAP_SYS_ADMIN); EXPECT_EQ(0, umount(UPPER_BASE)); clear_cap(_metadata, CAP_SYS_ADMIN); EXPECT_EQ(0, remove_path(UPPER_BASE)); set_cap(_metadata, CAP_SYS_ADMIN); EXPECT_EQ(0, umount(MERGE_DATA)); clear_cap(_metadata, CAP_SYS_ADMIN); EXPECT_EQ(0, remove_path(MERGE_DATA)); cleanup_layout(_metadata); } TEST_F_FORK(layout2_overlay, no_restriction) { if (self->skip_test) SKIP(return, "overlayfs is not supported (test)"); ASSERT_EQ(0, test_open(lower_fl1, O_RDONLY)); ASSERT_EQ(0, test_open(lower_dl1, O_RDONLY)); ASSERT_EQ(0, test_open(lower_dl1_fl2, O_RDONLY)); ASSERT_EQ(0, test_open(lower_fo1, O_RDONLY)); ASSERT_EQ(0, test_open(lower_do1, O_RDONLY)); ASSERT_EQ(0, test_open(lower_do1_fo2, O_RDONLY)); ASSERT_EQ(0, test_open(lower_do1_fl3, O_RDONLY)); ASSERT_EQ(0, test_open(upper_fu1, O_RDONLY)); ASSERT_EQ(0, test_open(upper_du1, O_RDONLY)); ASSERT_EQ(0, test_open(upper_du1_fu2, O_RDONLY)); ASSERT_EQ(0, test_open(upper_fo1, O_RDONLY)); ASSERT_EQ(0, test_open(upper_do1, O_RDONLY)); ASSERT_EQ(0, test_open(upper_do1_fo2, O_RDONLY)); ASSERT_EQ(0, test_open(upper_do1_fu3, O_RDONLY)); ASSERT_EQ(0, test_open(merge_fl1, O_RDONLY)); ASSERT_EQ(0, test_open(merge_dl1, O_RDONLY)); ASSERT_EQ(0, test_open(merge_dl1_fl2, O_RDONLY)); ASSERT_EQ(0, test_open(merge_fu1, O_RDONLY)); ASSERT_EQ(0, test_open(merge_du1, O_RDONLY)); ASSERT_EQ(0, test_open(merge_du1_fu2, O_RDONLY)); ASSERT_EQ(0, test_open(merge_fo1, O_RDONLY)); ASSERT_EQ(0, test_open(merge_do1, O_RDONLY)); ASSERT_EQ(0, test_open(merge_do1_fo2, O_RDONLY)); ASSERT_EQ(0, test_open(merge_do1_fl3, O_RDONLY)); ASSERT_EQ(0, test_open(merge_do1_fu3, O_RDONLY)); } #define for_each_path(path_list, path_entry, i) \ for (i = 0, path_entry = *path_list[i]; path_list[i]; \ path_entry = *path_list[++i]) TEST_F_FORK(layout2_overlay, same_content_different_file) { /* Sets access right on parent directories of both layers. */ const struct rule layer1_base[] = { { .path = LOWER_BASE, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = UPPER_BASE, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = MERGE_BASE, .access = ACCESS_RW, }, {}, }; const struct rule layer2_data[] = { { .path = LOWER_DATA, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = UPPER_DATA, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = MERGE_DATA, .access = ACCESS_RW, }, {}, }; /* Sets access right on directories inside both layers. */ const struct rule layer3_subdirs[] = { { .path = lower_dl1, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = lower_do1, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = upper_du1, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = upper_do1, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = merge_dl1, .access = ACCESS_RW, }, { .path = merge_du1, .access = ACCESS_RW, }, { .path = merge_do1, .access = ACCESS_RW, }, {}, }; /* Tighten access rights to the files. */ const struct rule layer4_files[] = { { .path = lower_dl1_fl2, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = lower_do1_fo2, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = lower_do1_fl3, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = upper_du1_fu2, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = upper_do1_fo2, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = upper_do1_fu3, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, { .path = merge_dl1_fl2, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, }, { .path = merge_du1_fu2, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, }, { .path = merge_do1_fo2, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, }, { .path = merge_do1_fl3, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, }, { .path = merge_do1_fu3, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, }, {}, }; const struct rule layer5_merge_only[] = { { .path = MERGE_DATA, .access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_WRITE_FILE, }, {}, }; int ruleset_fd; size_t i; const char *path_entry; if (self->skip_test) SKIP(return, "overlayfs is not supported (test)"); /* Sets rules on base directories (i.e. outside overlay scope). */ ruleset_fd = create_ruleset(_metadata, ACCESS_RW, layer1_base); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks lower layer. */ for_each_path(lower_base_files, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDONLY)); ASSERT_EQ(EACCES, test_open(path_entry, O_WRONLY)); } for_each_path(lower_base_directories, path_entry, i) { ASSERT_EQ(EACCES, test_open(path_entry, O_RDONLY | O_DIRECTORY)); } for_each_path(lower_sub_files, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDONLY)); ASSERT_EQ(EACCES, test_open(path_entry, O_WRONLY)); } /* Checks upper layer. */ for_each_path(upper_base_files, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDONLY)); ASSERT_EQ(EACCES, test_open(path_entry, O_WRONLY)); } for_each_path(upper_base_directories, path_entry, i) { ASSERT_EQ(EACCES, test_open(path_entry, O_RDONLY | O_DIRECTORY)); } for_each_path(upper_sub_files, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDONLY)); ASSERT_EQ(EACCES, test_open(path_entry, O_WRONLY)); } /* * Checks that access rights are independent from the lower and upper * layers: write access to upper files viewed through the merge point * is still allowed, and write access to lower file viewed (and copied) * through the merge point is still allowed. */ for_each_path(merge_base_files, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDWR)); } for_each_path(merge_base_directories, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDONLY | O_DIRECTORY)); } for_each_path(merge_sub_files, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDWR)); } /* Sets rules on data directories (i.e. inside overlay scope). */ ruleset_fd = create_ruleset(_metadata, ACCESS_RW, layer2_data); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks merge. */ for_each_path(merge_base_files, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDWR)); } for_each_path(merge_base_directories, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDONLY | O_DIRECTORY)); } for_each_path(merge_sub_files, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDWR)); } /* Same checks with tighter rules. */ ruleset_fd = create_ruleset(_metadata, ACCESS_RW, layer3_subdirs); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks changes for lower layer. */ for_each_path(lower_base_files, path_entry, i) { ASSERT_EQ(EACCES, test_open(path_entry, O_RDONLY)); } /* Checks changes for upper layer. */ for_each_path(upper_base_files, path_entry, i) { ASSERT_EQ(EACCES, test_open(path_entry, O_RDONLY)); } /* Checks all merge accesses. */ for_each_path(merge_base_files, path_entry, i) { ASSERT_EQ(EACCES, test_open(path_entry, O_RDWR)); } for_each_path(merge_base_directories, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDONLY | O_DIRECTORY)); } for_each_path(merge_sub_files, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDWR)); } /* Sets rules directly on overlayed files. */ ruleset_fd = create_ruleset(_metadata, ACCESS_RW, layer4_files); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks unchanged accesses on lower layer. */ for_each_path(lower_sub_files, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDONLY)); ASSERT_EQ(EACCES, test_open(path_entry, O_WRONLY)); } /* Checks unchanged accesses on upper layer. */ for_each_path(upper_sub_files, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDONLY)); ASSERT_EQ(EACCES, test_open(path_entry, O_WRONLY)); } /* Checks all merge accesses. */ for_each_path(merge_base_files, path_entry, i) { ASSERT_EQ(EACCES, test_open(path_entry, O_RDWR)); } for_each_path(merge_base_directories, path_entry, i) { ASSERT_EQ(EACCES, test_open(path_entry, O_RDONLY | O_DIRECTORY)); } for_each_path(merge_sub_files, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDWR)); } /* Only allowes access to the merge hierarchy. */ ruleset_fd = create_ruleset(_metadata, ACCESS_RW, layer5_merge_only); ASSERT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks new accesses on lower layer. */ for_each_path(lower_sub_files, path_entry, i) { ASSERT_EQ(EACCES, test_open(path_entry, O_RDONLY)); } /* Checks new accesses on upper layer. */ for_each_path(upper_sub_files, path_entry, i) { ASSERT_EQ(EACCES, test_open(path_entry, O_RDONLY)); } /* Checks all merge accesses. */ for_each_path(merge_base_files, path_entry, i) { ASSERT_EQ(EACCES, test_open(path_entry, O_RDWR)); } for_each_path(merge_base_directories, path_entry, i) { ASSERT_EQ(EACCES, test_open(path_entry, O_RDONLY | O_DIRECTORY)); } for_each_path(merge_sub_files, path_entry, i) { ASSERT_EQ(0, test_open(path_entry, O_RDWR)); } } FIXTURE(layout3_fs) { bool has_created_dir; bool has_created_file; char *dir_path; bool skip_test; }; FIXTURE_VARIANT(layout3_fs) { const struct mnt_opt mnt; const char *const file_path; unsigned int cwd_fs_magic; }; /* clang-format off */ FIXTURE_VARIANT_ADD(layout3_fs, tmpfs) { /* clang-format on */ .mnt = { .type = "tmpfs", .data = MNT_TMP_DATA, }, .file_path = file1_s1d1, }; FIXTURE_VARIANT_ADD(layout3_fs, ramfs) { .mnt = { .type = "ramfs", .data = "mode=700", }, .file_path = TMP_DIR "/dir/file", }; FIXTURE_VARIANT_ADD(layout3_fs, cgroup2) { .mnt = { .type = "cgroup2", }, .file_path = TMP_DIR "/test/cgroup.procs", }; FIXTURE_VARIANT_ADD(layout3_fs, proc) { .mnt = { .type = "proc", }, .file_path = TMP_DIR "/self/status", }; FIXTURE_VARIANT_ADD(layout3_fs, sysfs) { .mnt = { .type = "sysfs", }, .file_path = TMP_DIR "/kernel/notes", }; FIXTURE_VARIANT_ADD(layout3_fs, hostfs) { .mnt = { .source = TMP_DIR, .flags = MS_BIND, }, .file_path = TMP_DIR "/dir/file", .cwd_fs_magic = HOSTFS_SUPER_MAGIC, }; FIXTURE_SETUP(layout3_fs) { struct stat statbuf; const char *slash; size_t dir_len; if (!supports_filesystem(variant->mnt.type) || !cwd_matches_fs(variant->cwd_fs_magic)) { self->skip_test = true; SKIP(return, "this filesystem is not supported (setup)"); } slash = strrchr(variant->file_path, '/'); ASSERT_NE(slash, NULL); dir_len = (size_t)slash - (size_t)variant->file_path; ASSERT_LT(0, dir_len); self->dir_path = malloc(dir_len + 1); self->dir_path[dir_len] = '\0'; strncpy(self->dir_path, variant->file_path, dir_len); prepare_layout_opt(_metadata, &variant->mnt); /* Creates directory when required. */ if (stat(self->dir_path, &statbuf)) { set_cap(_metadata, CAP_DAC_OVERRIDE); EXPECT_EQ(0, mkdir(self->dir_path, 0700)) { TH_LOG("Failed to create directory \"%s\": %s", self->dir_path, strerror(errno)); free(self->dir_path); self->dir_path = NULL; } self->has_created_dir = true; clear_cap(_metadata, CAP_DAC_OVERRIDE); } /* Creates file when required. */ if (stat(variant->file_path, &statbuf)) { int fd; set_cap(_metadata, CAP_DAC_OVERRIDE); fd = creat(variant->file_path, 0600); EXPECT_LE(0, fd) { TH_LOG("Failed to create file \"%s\": %s", variant->file_path, strerror(errno)); } EXPECT_EQ(0, close(fd)); self->has_created_file = true; clear_cap(_metadata, CAP_DAC_OVERRIDE); } } FIXTURE_TEARDOWN(layout3_fs) { if (self->skip_test) SKIP(return, "this filesystem is not supported (teardown)"); if (self->has_created_file) { set_cap(_metadata, CAP_DAC_OVERRIDE); /* * Don't check for error because the file might already * have been removed (cf. release_inode test). */ unlink(variant->file_path); clear_cap(_metadata, CAP_DAC_OVERRIDE); } if (self->has_created_dir) { set_cap(_metadata, CAP_DAC_OVERRIDE); /* * Don't check for error because the directory might already * have been removed (cf. release_inode test). */ rmdir(self->dir_path); clear_cap(_metadata, CAP_DAC_OVERRIDE); } free(self->dir_path); self->dir_path = NULL; cleanup_layout(_metadata); } static void layer3_fs_tag_inode(struct __test_metadata *const _metadata, FIXTURE_DATA(layout3_fs) * self, const FIXTURE_VARIANT(layout3_fs) * variant, const char *const rule_path) { const struct rule layer1_allow_read_file[] = { { .path = rule_path, .access = LANDLOCK_ACCESS_FS_READ_FILE, }, {}, }; const struct landlock_ruleset_attr layer2_deny_everything_attr = { .handled_access_fs = LANDLOCK_ACCESS_FS_READ_FILE, }; const char *const dev_null_path = "/dev/null"; int ruleset_fd; if (self->skip_test) SKIP(return, "this filesystem is not supported (test)"); /* Checks without Landlock. */ EXPECT_EQ(0, test_open(dev_null_path, O_RDONLY | O_CLOEXEC)); EXPECT_EQ(0, test_open(variant->file_path, O_RDONLY | O_CLOEXEC)); ruleset_fd = create_ruleset(_metadata, LANDLOCK_ACCESS_FS_READ_FILE, layer1_allow_read_file); EXPECT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); EXPECT_EQ(EACCES, test_open(dev_null_path, O_RDONLY | O_CLOEXEC)); EXPECT_EQ(0, test_open(variant->file_path, O_RDONLY | O_CLOEXEC)); /* Forbids directory reading. */ ruleset_fd = landlock_create_ruleset(&layer2_deny_everything_attr, sizeof(layer2_deny_everything_attr), 0); EXPECT_LE(0, ruleset_fd); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); /* Checks with Landlock and forbidden access. */ EXPECT_EQ(EACCES, test_open(dev_null_path, O_RDONLY | O_CLOEXEC)); EXPECT_EQ(EACCES, test_open(variant->file_path, O_RDONLY | O_CLOEXEC)); } /* Matrix of tests to check file hierarchy evaluation. */ TEST_F_FORK(layout3_fs, tag_inode_dir_parent) { /* The current directory must not be the root for this test. */ layer3_fs_tag_inode(_metadata, self, variant, "."); } TEST_F_FORK(layout3_fs, tag_inode_dir_mnt) { layer3_fs_tag_inode(_metadata, self, variant, TMP_DIR); } TEST_F_FORK(layout3_fs, tag_inode_dir_child) { layer3_fs_tag_inode(_metadata, self, variant, self->dir_path); } TEST_F_FORK(layout3_fs, tag_inode_file) { layer3_fs_tag_inode(_metadata, self, variant, variant->file_path); } /* Light version of layout1.release_inodes */ TEST_F_FORK(layout3_fs, release_inodes) { const struct rule layer1[] = { { .path = TMP_DIR, .access = LANDLOCK_ACCESS_FS_READ_DIR, }, {}, }; int ruleset_fd; if (self->skip_test) SKIP(return, "this filesystem is not supported (test)"); /* Clean up for the teardown to not fail. */ if (self->has_created_file) EXPECT_EQ(0, remove_path(variant->file_path)); if (self->has_created_dir) /* Don't check for error because of cgroup specificities. */ remove_path(self->dir_path); ruleset_fd = create_ruleset(_metadata, LANDLOCK_ACCESS_FS_READ_DIR, layer1); ASSERT_LE(0, ruleset_fd); /* Unmount the filesystem while it is being used by a ruleset. */ set_cap(_metadata, CAP_SYS_ADMIN); ASSERT_EQ(0, umount(TMP_DIR)); clear_cap(_metadata, CAP_SYS_ADMIN); /* Replaces with a new mount point to simplify FIXTURE_TEARDOWN. */ set_cap(_metadata, CAP_SYS_ADMIN); ASSERT_EQ(0, mount_opt(&mnt_tmp, TMP_DIR)); clear_cap(_metadata, CAP_SYS_ADMIN); enforce_ruleset(_metadata, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); /* Checks that access to the new mount point is denied. */ ASSERT_EQ(EACCES, test_open(TMP_DIR, O_RDONLY)); } TEST_HARNESS_MAIN
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