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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2009-10-04 21:49:48 +0900
committerJames Morris <jmorris@namei.org>2009-10-12 10:56:02 +1100
commit8b8efb44033c7e86b3dc76f825c693ec92ae30e9 (patch)
tree8cf43afc59f88f36a86f3a8165770bccec28b3c3
parent89eda06837094ce9f34fae269b8773fcfd70f046 (diff)
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LSM: Add security_path_chroot().
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>
-rw-r--r--fs/open.c3
-rw-r--r--include/linux/security.h11
-rw-r--r--security/capability.c6
-rw-r--r--security/security.c5
4 files changed, 25 insertions, 0 deletions
diff --git a/fs/open.c b/fs/open.c
index b5c294d..201041d 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -587,6 +587,9 @@ SYSCALL_DEFINE1(chroot, const char __user *, filename)
error = -EPERM;
if (!capable(CAP_SYS_CHROOT))
goto dput_and_out;
+ error = security_path_chroot(&path);
+ if (error)
+ goto dput_and_out;
set_fs_root(current->fs, &path);
error = 0;
diff --git a/include/linux/security.h b/include/linux/security.h
index c8a584c..ed0faea 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -459,6 +459,10 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* @uid contains new owner's ID.
* @gid contains new group's ID.
* 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:
* Check the permission to read the symbolic 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,
mode_t mode);
int (*path_chown) (struct path *path, uid_t uid, gid_t gid);
+ int (*path_chroot) (struct path *path);
#endif
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,
mode_t mode);
int security_path_chown(struct path *path, uid_t uid, gid_t gid);
+int security_path_chroot(struct path *path);
#else /* CONFIG_SECURITY_PATH */
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;
}
+
+static inline int security_path_chroot(struct path *path)
+{
+ return 0;
+}
#endif /* CONFIG_SECURITY_PATH */
#ifdef CONFIG_KEYS
diff --git a/security/capability.c b/security/capability.c
index 09279a8..4f3ab47 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -319,6 +319,11 @@ static int cap_path_chown(struct path *path, uid_t uid, gid_t gid)
{
return 0;
}
+
+static int cap_path_chroot(struct path *root)
+{
+ return 0;
+}
#endif
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_chmod);
set_to_cap_if_null(ops, path_chown);
+ set_to_cap_if_null(ops, path_chroot);
#endif
set_to_cap_if_null(ops, file_permission);
set_to_cap_if_null(ops, file_alloc_security);
diff --git a/security/security.c b/security/security.c
index 5259270..2797573 100644
--- a/security/security.c
+++ b/security/security.c
@@ -449,6 +449,11 @@ int security_path_chown(struct path *path, uid_t uid, gid_t gid)
return 0;
return security_ops->path_chown(path, uid, gid);
}
+
+int security_path_chroot(struct path *path)
+{
+ return security_ops->path_chroot(path);
+}
#endif
int security_inode_create(struct inode *dir, struct dentry *dentry, int mode)