[PATCH][SRU][YAKKETY][XENIAL][TRUSTY] KEYS: ensure xbuf is large enough to fix buffer overflow in proc_keys_show (LP: #1634496)

[Colin King]

From: Colin Ian King <colin.king at canonical.com>

BugLink: http://bugs.launchpad.net/bugs/1634496

CVE-2016-7042

When stack protect is enabled xbuf is too small for timeout data causing a
buffer overflow and a stack protector corruption report.

OriginalAuthor: Vladis Dronov <vdronov at redhat.com>
OriginalLocation: https://bugzilla.redhat.com/attachment.cgi?id=1200212&action=diff

Signed-off-by: Colin Ian King <colin.king at canonical.com>
---
 security/keys/proc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/keys/proc.c b/security/keys/proc.c
index f0611a6..b9f531c 100644
--- a/security/keys/proc.c
+++ b/security/keys/proc.c
@@ -181,7 +181,7 @@ static int proc_keys_show(struct seq_file *m, void *v)
 	struct timespec now;
 	unsigned long timo;
 	key_ref_t key_ref, skey_ref;
-	char xbuf[12];
+	char xbuf[16];
 	int rc;
 
 	struct keyring_search_context ctx = {
-- 
2.9.3