AppArmor: Retrieve the dentry_path for error reporting when path lookup fails

When __d_path and d_absolute_path fail due to the name being outside of
the current namespace no name is reported.  Use dentry_path to provide
some hint as to which file was being accessed.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Kees Cook <kees@ubuntu.com>

1 files changed, 9 insertions, 6 deletions

diff --git a/security/apparmor/path.c b/security/apparmor/path.c
index 3dd605c69970..8c90fd0f49c5 100644
--- a/security/apparmor/path.c
+++ b/security/apparmor/path.c
@@ -94,18 +94,21 @@ static int d_namespace_path(struct path *path, char *buf, int buflen,
         } else
                 res = d_absolute_path(path, buf, buflen);
 
-        *name = res;
         /* handle error conditions - and still allow a partial path to
          * be returned.
          */
         if (IS_ERR(res)) {
-                error = PTR_ERR(res);
-                *name = buf;
-                goto out;
-        }
-        if (!our_mnt(path->mnt))
+                res = dentry_path_raw(path->dentry, buf, buflen);
+                if (IS_ERR(res)) {
+                        error = PTR_ERR(res);
+                        *name = buf;
+                        goto out;
+                };
+        } else if (!our_mnt(path->mnt))
                 connected = 0;
 
+        *name = res;
+
 ok:
         /* Handle two cases:
          * 1. A deleted dentry && profile is not allowing mediation of deleted