From: Jann Horn <ja...@google.com>
commit 8404d7a674c49278607d19726e0acc0cae299357 upstream.
A packed AppArmor policy contains null-terminated tag strings that are read
by unpack_nameX(). However, unpack_nameX() uses string functions on them
without ensuring that they are actually null-terminated, potentially
leading to out-of-bounds accesses.
Make sure that the tag string is null-terminated before passing it to
strcmp().
Cc: sta...@vger.kernel.org
Fixes: 736ec752d95e ("AppArmor: policy routines for loading and unpacking
policy")
Signed-off-by: Jann Horn <ja...@google.com>
Signed-off-by: John Johansen <john.johan...@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
security/apparmor/policy_unpack.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/security/apparmor/policy_unpack.c
+++ b/security/apparmor/policy_unpack.c
@@ -177,7 +177,7 @@ static bool unpack_nameX(struct aa_ext *
char *tag = NULL;
size_t size = unpack_u16_chunk(e, &tag);
/* if a name is specified it must match. otherwise skip tag */
- if (name && (!size || strcmp(name, tag)))
+ if (name && (!size || tag[size-1] != '\0' || strcmp(name, tag)))
goto fail;
} else if (name) {
/* if a name is specified and there is no name tag fail */
