cregit-Linux how code gets into the kernel

Release 4.15 security/tomoyo/tomoyo.c

Directory: security/tomoyo
// SPDX-License-Identifier: GPL-2.0
/*
 * security/tomoyo/tomoyo.c
 *
 * Copyright (C) 2005-2011  NTT DATA CORPORATION
 */

#include <linux/lsm_hooks.h>
#include "common.h"

/**
 * tomoyo_cred_alloc_blank - Target for security_cred_alloc_blank().
 *
 * @new: Pointer to "struct cred".
 * @gfp: Memory allocation flags.
 *
 * Returns 0.
 */

static int tomoyo_cred_alloc_blank(struct cred *new, gfp_t gfp) { new->security = NULL; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David Howells23100.00%1100.00%
Total23100.00%1100.00%

/** * tomoyo_cred_prepare - Target for security_prepare_creds(). * * @new: Pointer to "struct cred". * @old: Pointer to "struct cred". * @gfp: Memory allocation flags. * * Returns 0. */
static int tomoyo_cred_prepare(struct cred *new, const struct cred *old, gfp_t gfp) { struct tomoyo_domain_info *domain = old->security; new->security = domain; if (domain) atomic_inc(&domain->users); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Kentaro Takeda2958.00%150.00%
Tetsuo Handa2142.00%150.00%
Total50100.00%2100.00%

/** * tomoyo_cred_transfer - Target for security_transfer_creds(). * * @new: Pointer to "struct cred". * @old: Pointer to "struct cred". */
static void tomoyo_cred_transfer(struct cred *new, const struct cred *old) { tomoyo_cred_prepare(new, old, 0); }

Contributors

PersonTokensPropCommitsCommitProp
David Howells1869.23%150.00%
Tetsuo Handa830.77%150.00%
Total26100.00%2100.00%

/** * tomoyo_cred_free - Target for security_cred_free(). * * @cred: Pointer to "struct cred". */
static void tomoyo_cred_free(struct cred *cred) { struct tomoyo_domain_info *domain = cred->security; if (domain) atomic_dec(&domain->users); }

Contributors

PersonTokensPropCommitsCommitProp
Tetsuo Handa2887.50%150.00%
David Howells412.50%150.00%
Total32100.00%2100.00%

/** * tomoyo_bprm_set_creds - Target for security_bprm_set_creds(). * * @bprm: Pointer to "struct linux_binprm". * * Returns 0 on success, negative value otherwise. */
static int tomoyo_bprm_set_creds(struct linux_binprm *bprm) { /* * Do only if this function is called for the first time of an execve * operation. */ if (bprm->called_set_creds) return 0; #ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER /* * Load policy if /sbin/tomoyo-init exists and /sbin/init is requested * for the first time. */ if (!tomoyo_policy_loaded) tomoyo_load_policy(bprm->filename); #endif /* * Release reference to "struct tomoyo_domain_info" stored inside * "bprm->cred->security". New reference to "struct tomoyo_domain_info" * stored inside "bprm->cred->security" will be acquired later inside * tomoyo_find_next_domain(). */ atomic_dec(&((struct tomoyo_domain_info *) bprm->cred->security)->users); /* * Tell tomoyo_bprm_check_security() is called for the first time of an * execve operation. */ bprm->cred->security = NULL; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Kentaro Takeda4563.38%125.00%
Tetsuo Handa2535.21%250.00%
Kees Cook11.41%125.00%
Total71100.00%4100.00%

/** * tomoyo_bprm_check_security - Target for security_bprm_check(). * * @bprm: Pointer to "struct linux_binprm". * * Returns 0 on success, negative value otherwise. */
static int tomoyo_bprm_check_security(struct linux_binprm *bprm) { struct tomoyo_domain_info *domain = bprm->cred->security; /* * Execute permission is checked against pathname passed to do_execve() * using current domain. */ if (!domain) { const int idx = tomoyo_read_lock(); const int err = tomoyo_find_next_domain(bprm); tomoyo_read_unlock(idx); return err; } /* * Read permission is checked against interpreters using next domain. */ return tomoyo_check_open_permission(domain, &bprm->file->f_path, O_RDONLY); }

Contributors

PersonTokensPropCommitsCommitProp
Kentaro Takeda4767.14%133.33%
Tetsuo Handa2130.00%133.33%
Al Viro22.86%133.33%
Total70100.00%3100.00%

/** * tomoyo_inode_getattr - Target for security_inode_getattr(). * * @mnt: Pointer to "struct vfsmount". * @dentry: Pointer to "struct dentry". * * Returns 0 on success, negative value otherwise. */
static int tomoyo_inode_getattr(const struct path *path) { return tomoyo_path_perm(TOMOYO_TYPE_GETATTR, path, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Tetsuo Handa1986.36%266.67%
Al Viro313.64%133.33%
Total22100.00%3100.00%

/** * tomoyo_path_truncate - Target for security_path_truncate(). * * @path: Pointer to "struct path". * * Returns 0 on success, negative value otherwise. */
static int tomoyo_path_truncate(const struct path *path) { return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Kentaro Takeda1777.27%125.00%
Tetsuo Handa418.18%250.00%
Al Viro14.55%125.00%
Total22100.00%4100.00%

/** * tomoyo_path_unlink - Target for security_path_unlink(). * * @parent: Pointer to "struct path". * @dentry: Pointer to "struct dentry". * * Returns 0 on success, negative value otherwise. */
static int tomoyo_path_unlink(const struct path *parent, struct dentry *dentry) { struct path path = { .mnt = parent->mnt, .dentry = dentry }; return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Kentaro Takeda3576.09%120.00%
Kees Cook613.04%120.00%
Tetsuo Handa48.70%240.00%
Al Viro12.17%120.00%
Total46100.00%5100.00%

/** * tomoyo_path_mkdir - Target for security_path_mkdir(). * * @parent: Pointer to "struct path". * @dentry: Pointer to "struct dentry". * @mode: DAC permission mode. * * Returns 0 on success, negative value otherwise. */
static int tomoyo_path_mkdir(const struct path *parent, struct dentry *dentry, umode_t mode) { struct path path = { .mnt = parent->mnt, .dentry = dentry }; return tomoyo_path_number_perm(TOMOYO_TYPE_MKDIR, &path, mode & S_IALLUGO); }

Contributors

PersonTokensPropCommitsCommitProp
Kentaro Takeda3772.55%116.67%
Tetsuo Handa611.76%233.33%
Kees Cook611.76%116.67%
Al Viro23.92%233.33%
Total51100.00%6100.00%

/** * tomoyo_path_rmdir - Target for security_path_rmdir(). * * @parent: Pointer to "struct path". * @dentry: Pointer to "struct dentry". * * Returns 0 on success, negative value otherwise. */
static int tomoyo_path_rmdir(const struct path *parent, struct dentry *dentry) { struct path path = { .mnt = parent->mnt, .dentry = dentry }; return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Kentaro Takeda3576.09%120.00%
Kees Cook613.04%120.00%
Tetsuo Handa48.70%240.00%
Al Viro12.17%120.00%
Total46100.00%5100.00%

/** * tomoyo_path_symlink - Target for security_path_symlink(). * * @parent: Pointer to "struct path". * @dentry: Pointer to "struct dentry". * @old_name: Symlink's content. * * Returns 0 on success, negative value otherwise. */
static int tomoyo_path_symlink(const struct path *parent, struct dentry *dentry, const char *old_name) { struct path path = { .mnt = parent->mnt, .dentry = dentry }; return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path, old_name); }

Contributors

PersonTokensPropCommitsCommitProp
Kentaro Takeda4078.43%120.00%
Kees Cook611.76%120.00%
Tetsuo Handa47.84%240.00%
Al Viro11.96%120.00%
Total51100.00%5100.00%

/** * tomoyo_path_mknod - Target for security_path_mknod(). * * @parent: Pointer to "struct path". * @dentry: Pointer to "struct dentry". * @mode: DAC permission mode. * @dev: Device attributes. * * Returns 0 on success, negative value otherwise. */
static int tomoyo_path_mknod(const struct path *parent, struct dentry *dentry, umode_t mode, unsigned int dev) { struct path path = { .mnt = parent->mnt, .dentry = dentry }; int type = TOMOYO_TYPE_CREATE; const unsigned int perm = mode & S_IALLUGO; switch (mode & S_IFMT) { case S_IFCHR: type = TOMOYO_TYPE_MKCHAR; break; case S_IFBLK: type = TOMOYO_TYPE_MKBLOCK; break; default: goto no_dev; } return tomoyo_mkdev_perm(type, &path, perm, dev); no_dev: switch (mode & S_IFMT) { case S_IFIFO: type = TOMOYO_TYPE_MKFIFO; break; case S_IFSOCK: type = TOMOYO_TYPE_MKSOCK; break; } return tomoyo_path_number_perm(type, &path, perm); }

Contributors

PersonTokensPropCommitsCommitProp
Kentaro Takeda8261.19%114.29%
Tetsuo Handa4432.84%342.86%
Kees Cook64.48%114.29%
Al Viro21.49%228.57%
Total134100.00%7100.00%

/** * tomoyo_path_link - Target for security_path_link(). * * @old_dentry: Pointer to "struct dentry". * @new_dir: Pointer to "struct path". * @new_dentry: Pointer to "struct dentry". * * Returns 0 on success, negative value otherwise. */
static int tomoyo_path_link(struct dentry *old_dentry, const struct path *new_dir, struct dentry *new_dentry) { struct path path1 = { .mnt = new_dir->mnt, .dentry = old_dentry }; struct path path2 = { .mnt = new_dir->mnt, .dentry = new_dentry }; return tomoyo_path2_perm(TOMOYO_TYPE_LINK, &path1, &path2); }

Contributors

PersonTokensPropCommitsCommitProp
Kentaro Takeda5578.57%125.00%
Kees Cook1217.14%125.00%
Tetsuo Handa22.86%125.00%
Al Viro11.43%125.00%
Total70100.00%4100.00%

/** * tomoyo_path_rename - Target for security_path_rename(). * * @old_parent: Pointer to "struct path". * @old_dentry: Pointer to "struct dentry". * @new_parent: Pointer to "struct path". * @new_dentry: Pointer to "struct dentry". * * Returns 0 on success, negative value otherwise. */
static int tomoyo_path_rename(const struct path *old_parent, struct dentry *old_dentry, const struct path *new_parent, struct dentry *new_dentry) { struct path path1 = { .mnt = old_parent->mnt, .dentry = old_dentry }; struct path path2 = { .mnt = new_parent->mnt, .dentry = new_dentry }; return tomoyo_path2_perm(TOMOYO_TYPE_RENAME, &path1, &path2); }

Contributors

PersonTokensPropCommitsCommitProp
Kentaro Takeda6078.95%125.00%
Kees Cook1215.79%125.00%
Tetsuo Handa22.63%125.00%
Al Viro22.63%125.00%
Total76100.00%4100.00%

/** * tomoyo_file_fcntl - Target for security_file_fcntl(). * * @file: Pointer to "struct file". * @cmd: Command for fcntl(). * @arg: Argument for @cmd. * * Returns 0 on success, negative value otherwise. */
static int tomoyo_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg) { if (!(cmd == F_SETFL && ((arg ^ file->f_flags) & O_APPEND))) return 0; return tomoyo_check_open_permission(tomoyo_domain(), &file->f_path, O_WRONLY | (arg & O_APPEND)); }

Contributors

PersonTokensPropCommitsCommitProp
Kentaro Takeda4266.67%133.33%
Tetsuo Handa2133.33%266.67%
Total63100.00%3100.00%

/** * tomoyo_file_open - Target for security_file_open(). * * @f: Pointer to "struct file". * @cred: Pointer to "struct cred". * * Returns 0 on success, negative value otherwise. */
static int tomoyo_file_open(struct file *f, const struct cred *cred) { int flags = f->f_flags; /* Don't check read permission here if called from do_execve(). */ if (current->in_execve) return 0; return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, flags); }

Contributors

PersonTokensPropCommitsCommitProp
Kentaro Takeda4797.92%150.00%
Eric Paris12.08%150.00%
Total48100.00%2100.00%

/** * tomoyo_file_ioctl - Target for security_file_ioctl(). * * @file: Pointer to "struct file". * @cmd: Command for ioctl(). * @arg: Argument for @cmd. * * Returns 0 on success, negative value otherwise. */
static int tomoyo_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { return tomoyo_path_number_perm(TOMOYO_TYPE_IOCTL, &file->f_path, cmd); }

Contributors

PersonTokensPropCommitsCommitProp
Tetsuo Handa32100.00%3100.00%
Total32100.00%3100.00%

/** * tomoyo_path_chmod - Target for security_path_chmod(). * * @path: Pointer to "struct path". * @mode: DAC permission mode. * * Returns 0 on success, negative value otherwise. */
static int tomoyo_path_chmod(const struct path *path, umode_t mode) { return tomoyo_path_number_perm(TOMOYO_TYPE_CHMOD, path, mode & S_IALLUGO); }

Contributors

PersonTokensPropCommitsCommitProp
Tetsuo Handa2385.19%350.00%
Al Viro414.81%350.00%
Total27100.00%6100.00%

/** * tomoyo_path_chown - Target for security_path_chown(). * * @path: Pointer to "struct path". * @uid: Owner ID. * @gid: Group ID. * * Returns 0 on success, negative value otherwise. */
static int tomoyo_path_chown(const struct path *path, kuid_t uid, kgid_t gid) { int error = 0; if (uid_valid(uid)) error = tomoyo_path_number_perm(TOMOYO_TYPE_CHOWN, path, from_kuid(&init_user_ns, uid)); if (!error && gid_valid(gid)) error = tomoyo_path_number_perm(TOMOYO_TYPE_CHGRP, path, from_kgid(&init_user_ns, gid)); return error; }

Contributors

PersonTokensPropCommitsCommitProp
Tetsuo Handa5672.73%360.00%
Eric W. Biedermann2025.97%120.00%
Al Viro11.30%120.00%
Total77100.00%5100.00%

/** * tomoyo_path_chroot - Target for security_path_chroot(). * * @path: Pointer to "struct path". * * Returns 0 on success, negative value otherwise. */
static int tomoyo_path_chroot(const struct path *path) { return tomoyo_path_perm(TOMOYO_TYPE_CHROOT, path, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Tetsuo Handa2195.45%375.00%
Al Viro14.55%125.00%
Total22100.00%4100.00%

/** * tomoyo_sb_mount - Target for security_sb_mount(). * * @dev_name: Name of device file. Maybe NULL. * @path: Pointer to "struct path". * @type: Name of filesystem type. Maybe NULL. * @flags: Mount options. * @data: Optional data. Maybe NULL. * * Returns 0 on success, negative value otherwise. */
static int tomoyo_sb_mount(const char *dev_name, const struct path *path, const char *type, unsigned long flags, void *data) { return tomoyo_mount_permission(dev_name, path, type, flags, data); }

Contributors

PersonTokensPropCommitsCommitProp
Tetsuo Handa4193.18%250.00%
Al Viro36.82%250.00%
Total44100.00%4100.00%

/** * tomoyo_sb_umount - Target for security_sb_umount(). * * @mnt: Pointer to "struct vfsmount". * @flags: Unmount options. * * Returns 0 on success, negative value otherwise. */
static int tomoyo_sb_umount(struct vfsmount *mnt, int flags) { struct path path = { .mnt = mnt, .dentry = mnt->mnt_root }; return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Tetsuo Handa3786.05%375.00%
Kees Cook613.95%125.00%
Total43100.00%4100.00%

/** * tomoyo_sb_pivotroot - Target for security_sb_pivotroot(). * * @old_path: Pointer to "struct path". * @new_path: Pointer to "struct path". * * Returns 0 on success, negative value otherwise. */
static int tomoyo_sb_pivotroot(const struct path *old_path, const struct path *new_path) { return tomoyo_path2_perm(TOMOYO_TYPE_PIVOT_ROOT, new_path, old_path); }

Contributors

PersonTokensPropCommitsCommitProp
Tetsuo Handa2692.86%266.67%
Al Viro27.14%133.33%
Total28100.00%3100.00%

/** * tomoyo_socket_listen - Check permission for listen(). * * @sock: Pointer to "struct socket". * @backlog: Backlog parameter. * * Returns 0 on success, negative value otherwise. */
static int tomoyo_socket_listen(struct socket *sock, int backlog) { return tomoyo_socket_listen_permission(sock); }

Contributors

PersonTokensPropCommitsCommitProp
Tetsuo Handa20100.00%1100.00%
Total20100.00%1100.00%

/** * tomoyo_socket_connect - Check permission for connect(). * * @sock: Pointer to "struct socket". * @addr: Pointer to "struct sockaddr". * @addr_len: Size of @addr. * * Returns 0 on success, negative value otherwise. */
static int tomoyo_socket_connect(struct socket *sock, struct sockaddr *addr, int addr_len) { return tomoyo_socket_connect_permission(sock, addr, addr_len); }

Contributors

PersonTokensPropCommitsCommitProp
Tetsuo Handa29100.00%1100.00%
Total29100.00%1100.00%

/** * tomoyo_socket_bind - Check permission for bind(). * * @sock: Pointer to "struct socket". * @addr: Pointer to "struct sockaddr". * @addr_len: Size of @addr. * * Returns 0 on success, negative value otherwise. */
static int tomoyo_socket_bind(struct socket *sock, struct sockaddr *addr, int addr_len) { return tomoyo_socket_bind_permission(sock, addr, addr_len); }

Contributors

PersonTokensPropCommitsCommitProp
Tetsuo Handa29100.00%1100.00%
Total29100.00%1100.00%

/** * tomoyo_socket_sendmsg - Check permission for sendmsg(). * * @sock: Pointer to "struct socket". * @msg: Pointer to "struct msghdr". * @size: Size of message. * * Returns 0 on success, negative value otherwise. */
static int tomoyo_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size) { return tomoyo_socket_sendmsg_permission(sock, msg, size); }

Contributors

PersonTokensPropCommitsCommitProp
Tetsuo Handa29100.00%1100.00%
Total29100.00%1100.00%

/* * tomoyo_security_ops is a "struct security_operations" which is used for * registering TOMOYO. */ static struct security_hook_list tomoyo_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(cred_alloc_blank, tomoyo_cred_alloc_blank), LSM_HOOK_INIT(cred_prepare, tomoyo_cred_prepare), LSM_HOOK_INIT(cred_transfer, tomoyo_cred_transfer), LSM_HOOK_INIT(cred_free, tomoyo_cred_free), LSM_HOOK_INIT(bprm_set_creds, tomoyo_bprm_set_creds), LSM_HOOK_INIT(bprm_check_security, tomoyo_bprm_check_security), LSM_HOOK_INIT(file_fcntl, tomoyo_file_fcntl), LSM_HOOK_INIT(file_open, tomoyo_file_open), LSM_HOOK_INIT(path_truncate, tomoyo_path_truncate), LSM_HOOK_INIT(path_unlink, tomoyo_path_unlink), LSM_HOOK_INIT(path_mkdir, tomoyo_path_mkdir), LSM_HOOK_INIT(path_rmdir, tomoyo_path_rmdir), LSM_HOOK_INIT(path_symlink, tomoyo_path_symlink), LSM_HOOK_INIT(path_mknod, tomoyo_path_mknod), LSM_HOOK_INIT(path_link, tomoyo_path_link), LSM_HOOK_INIT(path_rename, tomoyo_path_rename), LSM_HOOK_INIT(inode_getattr, tomoyo_inode_getattr), LSM_HOOK_INIT(file_ioctl, tomoyo_file_ioctl), LSM_HOOK_INIT(path_chmod, tomoyo_path_chmod), LSM_HOOK_INIT(path_chown, tomoyo_path_chown), LSM_HOOK_INIT(path_chroot, tomoyo_path_chroot), LSM_HOOK_INIT(sb_mount, tomoyo_sb_mount), LSM_HOOK_INIT(sb_umount, tomoyo_sb_umount), LSM_HOOK_INIT(sb_pivotroot, tomoyo_sb_pivotroot), LSM_HOOK_INIT(socket_bind, tomoyo_socket_bind), LSM_HOOK_INIT(socket_connect, tomoyo_socket_connect), LSM_HOOK_INIT(socket_listen, tomoyo_socket_listen), LSM_HOOK_INIT(socket_sendmsg, tomoyo_socket_sendmsg), }; /* Lock for GC. */ DEFINE_SRCU(tomoyo_ss); /** * tomoyo_init - Register TOMOYO Linux as a LSM module. * * Returns 0. */
static int __init tomoyo_init(void) { struct cred *cred = (struct cred *) current_cred(); if (!security_module_enable("tomoyo")) return 0; /* register ourselves with the security framework */ security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks), "tomoyo"); printk(KERN_INFO "TOMOYO Linux initialized\n"); cred->security = &tomoyo_kernel_domain; tomoyo_mm_init(); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Kentaro Takeda5381.54%120.00%
Casey Schaufler913.85%240.00%
Tetsuo Handa34.62%240.00%
Total65100.00%5100.00%

security_initcall(tomoyo_init);

Overall Contributors

PersonTokensPropCommitsCommitProp
Kentaro Takeda67642.25%12.22%
Tetsuo Handa62939.31%1635.56%
Casey Schaufler1257.81%48.89%
Kees Cook613.81%24.44%
David Howells513.19%12.22%
Al Viro281.75%1635.56%
Eric W. Biedermann201.25%12.22%
Lai Jiangshan40.25%12.22%
Eric Paris40.25%12.22%
Greg Kroah-Hartman10.06%12.22%
James Morris10.06%12.22%
Total1600100.00%45100.00%
Directory: security/tomoyo
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