apparmor: fix overlapping attachment computation

commit 2504db207146543736e877241f3b3de005cbe056 upstream.

When finding the profile via patterned attachments, the longest left
match is being set to the static compile time value and not using the
runtime computed value.

Fix this by setting the candidate value to the greater of the
precomputed value or runtime computed value.

Fixes: 21f606610502 ("apparmor: improve overlapping domain attachment resolution")
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c
index 583680f..a7b3d8e 100644 (file)
--- a/security/apparmor/domain.c
+++ b/security/apparmor/domain.c
@@ -467,7 +467,7 @@ restart:
                                 * xattrs, or a longer match
                                 */
                                candidate = profile;
-                               candidate_len = profile->xmatch_len;
+                               candidate_len = max(count, profile->xmatch_len);
                                candidate_xattrs = ret;
                                conflict = false;
                        }

diff --git a/security/apparmor/include/policy.h b/security/apparmor/include/policy.h
index b5b4b81..b5aa423 100644 (file)
--- a/security/apparmor/include/policy.h
+++ b/security/apparmor/include/policy.h
@@ -135,7 +135,7 @@ struct aa_profile {
 
        const char *attach;
        struct aa_dfa *xmatch;
-       int xmatch_len;
+       unsigned int xmatch_len;
        enum audit_mode audit;
        long mode;
        u32 path_flags;