This is a note to let you know that I've just added the patch titled
crypto: rsa-pkcs1pad - use constant time memory comparison for MACs
to the 4.9-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:
crypto-rsa-pkcs1pad-use-constant-time-memory-comparison-for-macs.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From fec17cb2231733174e039ad9054fa16bb358e2ec Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@xxxxxxxxx>
Date: Sun, 11 Jun 2017 23:20:23 +0200
Subject: crypto: rsa-pkcs1pad - use constant time memory comparison for MACs
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From: Jason A. Donenfeld <Jason@xxxxxxxxx>
commit fec17cb2231733174e039ad9054fa16bb358e2ec upstream.
Otherwise, we enable all sorts of forgeries via timing attack.
Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
Suggested-by: Stephan Müller <smueller@xxxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: linux-crypto@xxxxxxxxxxxxxxx
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
crypto/rsa-pkcs1pad.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/crypto/rsa-pkcs1pad.c
+++ b/crypto/rsa-pkcs1pad.c
@@ -496,7 +496,7 @@ static int pkcs1pad_verify_complete(stru
goto done;
pos++;
- if (memcmp(out_buf + pos, digest_info->data, digest_info->size))
+ if (crypto_memneq(out_buf + pos, digest_info->data, digest_info->size))
goto done;
pos += digest_info->size;
Patches currently in stable-queue which might be from Jason@xxxxxxxxx are
queue-4.9/crypto-rsa-pkcs1pad-use-constant-time-memory-comparison-for-macs.patch