diff options
| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2017-06-11 23:20:23 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-15 13:09:05 +0200 |
| commit | f85a3c8f00bd687d26e70b0f58df0041aabde601 (patch) | |
| tree | 2dc67cc78bd4d167464bdd142d2e8a2e2476aa87 | |
| parent | d56e029fc227ff6be9d780da1f3e9b893be47cea (diff) | |
crypto: rsa-pkcs1pad - use constant time memory comparison for MACs
commit fec17cb2231733174e039ad9054fa16bb358e2ec upstream.
Otherwise, we enable all sorts of forgeries via timing attack.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Suggested-by: Stephan Müller <smueller@chronox.de>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: linux-crypto@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | crypto/rsa-pkcs1pad.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/crypto/rsa-pkcs1pad.c b/crypto/rsa-pkcs1pad.c index 8baab4307f7b..7830d304dff6 100644 --- a/crypto/rsa-pkcs1pad.c +++ b/crypto/rsa-pkcs1pad.c @@ -496,7 +496,7 @@ static int pkcs1pad_verify_complete(struct akcipher_request *req, int err) 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; |