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LSM: Add security_path_chroot().

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This patch allows pathname based LSM modules to check chroot() operations.

This hook is used by TOMOYO.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Tetsuo Handa 2009-10-04 21:49:48 +09:00 committed by James Morris
parent 89eda06837
commit 8b8efb4403
4 changed files with 25 additions and 0 deletions
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3
fs/open.c
View File

@ -587,6 +587,9 @@ SYSCALL_DEFINE1(chroot, const char __user *, filename)
error = -EPERM; error = -EPERM;
if (!capable(CAP_SYS_CHROOT)) if (!capable(CAP_SYS_CHROOT))
goto dput_and_out; goto dput_and_out;
error = security_path_chroot(&path);
if (error)
goto dput_and_out;
set_fs_root(current->fs, &path); set_fs_root(current->fs, &path);
error = 0; error = 0;

11
include/linux/security.h
View File

@ -459,6 +459,10 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* @uid contains new owner's ID. * @uid contains new owner's ID.
* @gid contains new group's ID. * @gid contains new group's ID.
* Return 0 if permission is granted. * Return 0 if permission is granted.
* @path_chroot:
* Check for permission to change root directory.
* @path contains the path structure.
* Return 0 if permission is granted.
* @inode_readlink: * @inode_readlink:
* Check the permission to read the symbolic link. * Check the permission to read the symbolic link.
* @dentry contains the dentry structure for the file link. * @dentry contains the dentry structure for the file link.
@ -1503,6 +1507,7 @@ struct security_operations {
int (*path_chmod) (struct dentry *dentry, struct vfsmount *mnt, int (*path_chmod) (struct dentry *dentry, struct vfsmount *mnt,
mode_t mode); mode_t mode);
int (*path_chown) (struct path *path, uid_t uid, gid_t gid); int (*path_chown) (struct path *path, uid_t uid, gid_t gid);
int (*path_chroot) (struct path *path);
#endif #endif
int (*inode_alloc_security) (struct inode *inode); int (*inode_alloc_security) (struct inode *inode);
@ -2970,6 +2975,7 @@ int security_path_rename(struct path *old_dir, struct dentry *old_dentry,
int security_path_chmod(struct dentry *dentry, struct vfsmount *mnt, int security_path_chmod(struct dentry *dentry, struct vfsmount *mnt,
mode_t mode); mode_t mode);
int security_path_chown(struct path *path, uid_t uid, gid_t gid); int security_path_chown(struct path *path, uid_t uid, gid_t gid);
int security_path_chroot(struct path *path);
#else /* CONFIG_SECURITY_PATH */ #else /* CONFIG_SECURITY_PATH */
static inline int security_path_unlink(struct path *dir, struct dentry *dentry) static inline int security_path_unlink(struct path *dir, struct dentry *dentry)
{ {
@ -3031,6 +3037,11 @@ static inline int security_path_chown(struct path *path, uid_t uid, gid_t gid)
{ {
return 0; return 0;
} }
static inline int security_path_chroot(struct path *path)
{
return 0;
}
#endif /* CONFIG_SECURITY_PATH */ #endif /* CONFIG_SECURITY_PATH */
#ifdef CONFIG_KEYS #ifdef CONFIG_KEYS

6
security/capability.c
View File

@ -319,6 +319,11 @@ static int cap_path_chown(struct path *path, uid_t uid, gid_t gid)
{ {
return 0; return 0;
} }
static int cap_path_chroot(struct path *root)
{
return 0;
}
#endif #endif
static int cap_file_permission(struct file *file, int mask) static int cap_file_permission(struct file *file, int mask)
@ -990,6 +995,7 @@ void security_fixup_ops(struct security_operations *ops)
set_to_cap_if_null(ops, path_truncate); set_to_cap_if_null(ops, path_truncate);
set_to_cap_if_null(ops, path_chmod); set_to_cap_if_null(ops, path_chmod);
set_to_cap_if_null(ops, path_chown); set_to_cap_if_null(ops, path_chown);
set_to_cap_if_null(ops, path_chroot);
#endif #endif
set_to_cap_if_null(ops, file_permission); set_to_cap_if_null(ops, file_permission);
set_to_cap_if_null(ops, file_alloc_security); set_to_cap_if_null(ops, file_alloc_security);

5
security/security.c
View File

@ -449,6 +449,11 @@ int security_path_chown(struct path *path, uid_t uid, gid_t gid)
return 0; return 0;
return security_ops->path_chown(path, uid, gid); return security_ops->path_chown(path, uid, gid);
} }
int security_path_chroot(struct path *path)
{
return security_ops->path_chroot(path);
}
#endif #endif
int security_inode_create(struct inode *dir, struct dentry *dentry, int mode) int security_inode_create(struct inode *dir, struct dentry *dentry, int mode)