Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Christian Brauner | 1270 | 98.91% | 1 | 25.00% |
Shuah Khan | 12 | 0.93% | 1 | 25.00% |
Anders Roxell | 1 | 0.08% | 1 | 25.00% |
Colin Ian King | 1 | 0.08% | 1 | 25.00% |
Total | 1284 | 4 |
// SPDX-License-Identifier: GPL-2.0 #define _GNU_SOURCE #include <errno.h> #include <fcntl.h> #include <sched.h> #include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <asm/ioctls.h> #include <sys/mount.h> #include <sys/wait.h> #include "../kselftest.h" static bool terminal_dup2(int duplicate, int original) { int ret; ret = dup2(duplicate, original); if (ret < 0) return false; return true; } static int terminal_set_stdfds(int fd) { int i; if (fd < 0) return 0; for (i = 0; i < 3; i++) if (!terminal_dup2(fd, (int[]){STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO}[i])) return -1; return 0; } static int login_pty(int fd) { int ret; setsid(); ret = ioctl(fd, TIOCSCTTY, NULL); if (ret < 0) return -1; ret = terminal_set_stdfds(fd); if (ret < 0) return -1; if (fd > STDERR_FILENO) close(fd); return 0; } static int wait_for_pid(pid_t pid) { int status, ret; again: ret = waitpid(pid, &status, 0); if (ret == -1) { if (errno == EINTR) goto again; return -1; } if (ret != pid) goto again; if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) return -1; return 0; } static int resolve_procfd_symlink(int fd, char *buf, size_t buflen) { int ret; char procfd[4096]; ret = snprintf(procfd, 4096, "/proc/self/fd/%d", fd); if (ret < 0 || ret >= 4096) return -1; ret = readlink(procfd, buf, buflen); if (ret < 0 || (size_t)ret >= buflen) return -1; buf[ret] = '\0'; return 0; } static int do_tiocgptpeer(char *ptmx, char *expected_procfd_contents) { int ret; int master = -1, slave = -1, fret = -1; master = open(ptmx, O_RDWR | O_NOCTTY | O_CLOEXEC); if (master < 0) { fprintf(stderr, "Failed to open \"%s\": %s\n", ptmx, strerror(errno)); return -1; } /* * grantpt() makes assumptions about /dev/pts/ so ignore it. It's also * not really needed. */ ret = unlockpt(master); if (ret < 0) { fprintf(stderr, "Failed to unlock terminal\n"); goto do_cleanup; } #ifdef TIOCGPTPEER slave = ioctl(master, TIOCGPTPEER, O_RDWR | O_NOCTTY | O_CLOEXEC); #endif if (slave < 0) { if (errno == EINVAL) { fprintf(stderr, "TIOCGPTPEER is not supported. " "Skipping test.\n"); fret = KSFT_SKIP; } else { fprintf(stderr, "Failed to perform TIOCGPTPEER ioctl\n"); fret = EXIT_FAILURE; } goto do_cleanup; } pid_t pid = fork(); if (pid < 0) goto do_cleanup; if (pid == 0) { char buf[4096]; ret = login_pty(slave); if (ret < 0) { fprintf(stderr, "Failed to setup terminal\n"); _exit(EXIT_FAILURE); } ret = resolve_procfd_symlink(STDIN_FILENO, buf, sizeof(buf)); if (ret < 0) { fprintf(stderr, "Failed to retrieve pathname of pts " "slave file descriptor\n"); _exit(EXIT_FAILURE); } if (strncmp(expected_procfd_contents, buf, strlen(expected_procfd_contents)) != 0) { fprintf(stderr, "Received invalid contents for " "\"/proc/<pid>/fd/%d\" symlink: %s\n", STDIN_FILENO, buf); _exit(-1); } fprintf(stderr, "Contents of \"/proc/<pid>/fd/%d\" " "symlink are valid: %s\n", STDIN_FILENO, buf); _exit(EXIT_SUCCESS); } ret = wait_for_pid(pid); if (ret < 0) goto do_cleanup; fret = EXIT_SUCCESS; do_cleanup: if (master >= 0) close(master); if (slave >= 0) close(slave); return fret; } static int verify_non_standard_devpts_mount(void) { char *mntpoint; int ret = -1; char devpts[] = P_tmpdir "/devpts_fs_XXXXXX"; char ptmx[] = P_tmpdir "/devpts_fs_XXXXXX/ptmx"; ret = umount("/dev/pts"); if (ret < 0) { fprintf(stderr, "Failed to unmount \"/dev/pts\": %s\n", strerror(errno)); return -1; } (void)umount("/dev/ptmx"); mntpoint = mkdtemp(devpts); if (!mntpoint) { fprintf(stderr, "Failed to create temporary mountpoint: %s\n", strerror(errno)); return -1; } ret = mount("devpts", mntpoint, "devpts", MS_NOSUID | MS_NOEXEC, "newinstance,ptmxmode=0666,mode=0620,gid=5"); if (ret < 0) { fprintf(stderr, "Failed to mount devpts fs to \"%s\" in new " "mount namespace: %s\n", mntpoint, strerror(errno)); unlink(mntpoint); return -1; } ret = snprintf(ptmx, sizeof(ptmx), "%s/ptmx", devpts); if (ret < 0 || (size_t)ret >= sizeof(ptmx)) { unlink(mntpoint); return -1; } ret = do_tiocgptpeer(ptmx, mntpoint); unlink(mntpoint); if (ret < 0) return -1; return 0; } static int verify_ptmx_bind_mount(void) { int ret; ret = mount("/dev/pts/ptmx", "/dev/ptmx", NULL, MS_BIND, NULL); if (ret < 0) { fprintf(stderr, "Failed to bind mount \"/dev/pts/ptmx\" to " "\"/dev/ptmx\" mount namespace\n"); return -1; } ret = do_tiocgptpeer("/dev/ptmx", "/dev/pts/"); if (ret < 0) return -1; return 0; } static int verify_invalid_ptmx_bind_mount(void) { int ret; char mntpoint_fd; char ptmx[] = P_tmpdir "/devpts_ptmx_XXXXXX"; mntpoint_fd = mkstemp(ptmx); if (mntpoint_fd < 0) { fprintf(stderr, "Failed to create temporary directory: %s\n", strerror(errno)); return -1; } ret = mount("/dev/pts/ptmx", ptmx, NULL, MS_BIND, NULL); close(mntpoint_fd); if (ret < 0) { fprintf(stderr, "Failed to bind mount \"/dev/pts/ptmx\" to " "\"%s\" mount namespace\n", ptmx); return -1; } ret = do_tiocgptpeer(ptmx, "/dev/pts/"); if (ret == 0) return -1; return 0; } int main(int argc, char *argv[]) { int ret; if (!isatty(STDIN_FILENO)) { fprintf(stderr, "Standard input file descriptor is not attached " "to a terminal. Skipping test\n"); exit(KSFT_SKIP); } ret = unshare(CLONE_NEWNS); if (ret < 0) { fprintf(stderr, "Failed to unshare mount namespace\n"); exit(EXIT_FAILURE); } ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0); if (ret < 0) { fprintf(stderr, "Failed to make \"/\" MS_PRIVATE in new mount " "namespace\n"); exit(EXIT_FAILURE); } ret = verify_ptmx_bind_mount(); if (ret < 0) exit(EXIT_FAILURE); ret = verify_invalid_ptmx_bind_mount(); if (ret < 0) exit(EXIT_FAILURE); ret = verify_non_standard_devpts_mount(); if (ret < 0) exit(EXIT_FAILURE); exit(EXIT_SUCCESS); }
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