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| author | Jann Horn <jannh@google.com> | 2019-05-28 18:32:26 +0300 |
|---|---|---|
| committer | John Johansen <john.johansen@canonical.com> | 2019-06-19 02:04:16 +0300 |
| commit | 8404d7a674c49278607d19726e0acc0cae299357 (patch) | |
| tree | f78a44caa2a078b9325289d67d05993024aab15f /security/apparmor | |
| parent | 23375b13f98c5464c2b4d15f983cc062940f1f4e (diff) | |
| download | linux-8404d7a674c49278607d19726e0acc0cae299357.tar.xz | |
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>
Diffstat (limited to 'security/apparmor')
| -rw-r--r-- | security/apparmor/policy_unpack.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c index 01957ce9252b..005a705346f0 100644 --- a/security/apparmor/policy_unpack.c +++ b/security/apparmor/policy_unpack.c @@ -272,7 +272,7 @@ static bool unpack_nameX(struct aa_ext *e, enum aa_code code, const char *name) 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 */ |