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>

2 files changed, 11 insertions, 0 deletions

diff --git a/security/capability.c b/security/capability.c
index 09279a8d4a1..4f3ab476937 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 5259270e558..279757314a0 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)