From f4585bc20fc785d94192cf780ee925e25891ddfd Mon Sep 17 00:00:00 2001
From: Tyler Hicks <tyhicks@canonical.com>
Date: Fri, 6 Jul 2018 05:25:01 +0000
Subject: [PATCH] apparmor: Fully initialize aa_perms struct when answering userspace query
Git-commit: f4585bc20fc785d94192cf780ee925e25891ddfd
Patch-mainline: v4.19-rc1
References: bsc#1051510
Fully initialize the aa_perms struct in profile_query_cb() to avoid the
potential of using an uninitialized struct member's value in a response
to a query from userspace.
Detected by CoverityScan CID#1415126 ("Uninitialized scalar variable")
Fixes: 4f3b3f2d79a4 ("apparmor: add profile permission query ability")
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
security/apparmor/apparmorfs.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index 949dd8a48164..e09fe4d7307c 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -603,7 +603,7 @@ static const struct file_operations aa_fs_ns_revision_fops = {
static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
const char *match_str, size_t match_len)
{
- struct aa_perms tmp;
+ struct aa_perms tmp = { };
struct aa_dfa *dfa;
unsigned int state = 0;
@@ -613,7 +613,6 @@ static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
dfa = profile->file.dfa;
state = aa_dfa_match_len(dfa, profile->file.start,
match_str + 1, match_len - 1);
- tmp = nullperms;
if (state) {
struct path_cond cond = { };
@@ -627,8 +626,6 @@ static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
match_str, match_len);
if (state)
aa_compute_perms(dfa, state, &tmp);
- else
- tmp = nullperms;
}
aa_apply_modes_to_perms(profile, &tmp);
aa_perms_accum_raw(perms, &tmp);
--
2.18.0