3.19.8-ckt12 -stable review patch. If anyone has any objections, please let me
know.
------------------
From: David Gstir <da...@sigma-star.at>
commit 79960943fdc114fd4583c9ab164b5c89da7aa601 upstream.
Using non-constant time memcmp() makes the verification of the authentication
tag in the decrypt path vulnerable to timing attacks. Fix this by using
crypto_memneq() instead.
Signed-off-by: David Gstir <da...@sigma-star.at>
Signed-off-by: Herbert Xu <herb...@gondor.apana.org.au>
[ kamal: backport to 3.19-stable: context ]
Signed-off-by: Kamal Mostafa <ka...@canonical.com>
---
drivers/crypto/talitos.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index 0584c4e..181167f 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -870,7 +870,7 @@ static void ipsec_esp_decrypt_swauth_done(struct device
*dev,
icvdata = &edesc->link_tbl[0];
sg = sg_last(req->dst, edesc->dst_nents ? : 1);
- err = memcmp(icvdata, (char *)sg_virt(sg) + sg->length -
+ err = crypto_memneq(icvdata, (char *)sg_virt(sg) + sg->length -
ctx->authsize, ctx->authsize) ? -EBADMSG : 0;
}
--
1.9.1
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