tree f78a44caa2a078b9325289d67d05993024aab15f
parent 23375b13f98c5464c2b4d15f983cc062940f1f4e
author Jann Horn <jannh@google.com> 1559057546 +0200
committer John Johansen <john.johansen@canonical.com> 1560899056 -0700

apparmor: enforce nullbyte at end of tag string

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: stable@vger.kernel.org
Fixes: 736ec752d95e ("AppArmor: policy routines for loading and unpacking policy")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>