This is a note to let you know that I've just added the patch titled
apparmor: fix unsigned len comparison with less than zero
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
apparmor-fix-unsigned-len-comparison-with-less-than-.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 94438dc50cd3f1c98304936e513589b5674fad19
Author: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Date: Thu Jun 27 14:09:04 2019 +0100
apparmor: fix unsigned len comparison with less than zero
[ Upstream commit 00e0590dbaec6f1bcaa36a85467d7e3497ced522 ]
The sanity check in macro update_for_len checks to see if len
is less than zero, however, len is a size_t so it can never be
less than zero, so this sanity check is a no-op. Fix this by
making len a ssize_t so the comparison will work and add ulen
that is a size_t copy of len so that the min() macro won't
throw warnings about comparing different types.
Addresses-Coverity: ("Macro compares unsigned to 0")
Fixes: f1bd904175e8 ("apparmor: add the base fns() for domain labels")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Signed-off-by: John Johansen <john.johansen@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/security/apparmor/label.c b/security/apparmor/label.c
index 59f1cc2557a7..470693239e64 100644
--- a/security/apparmor/label.c
+++ b/security/apparmor/label.c
@@ -1458,11 +1458,13 @@ static inline bool use_label_hname(struct aa_ns *ns, struct aa_label *label,
/* helper macro for snprint routines */
#define update_for_len(total, len, size, str) \
do { \
+ size_t ulen = len; \
+ \
AA_BUG(len < 0); \
- total += len; \
- len = min(len, size); \
- size -= len; \
- str += len; \
+ total += ulen; \
+ ulen = min(ulen, size); \
+ size -= ulen; \
+ str += ulen; \
} while (0)
/**
@@ -1597,7 +1599,7 @@ int aa_label_snxprint(char *str, size_t size, struct aa_ns *ns,
struct aa_ns *prev_ns = NULL;
struct label_it i;
int count = 0, total = 0;
- size_t len;
+ ssize_t len;
AA_BUG(!str && size != 0);
AA_BUG(!label);
