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| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2017-06-11 23:20:23 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2017-06-20 11:21:19 +0800 |
| commit | fec17cb2231733174e039ad9054fa16bb358e2ec (patch) | |
| tree | b3fef173dac11fb9c6c7927e659a79c8f9df3bce /crypto | |
| parent | ffe55266e36bef40b940b38bfef4fcff4957624d (diff) | |
| download | lwn-fec17cb2231733174e039ad9054fa16bb358e2ec.tar.gz lwn-fec17cb2231733174e039ad9054fa16bb358e2ec.zip | |
crypto: rsa-pkcs1pad - use constant time memory comparison for MACs
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: stable@vger.kernel.org
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: linux-crypto@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
| -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 044bcfa69cba..407c64bdcdd9 100644 --- a/crypto/rsa-pkcs1pad.c +++ b/crypto/rsa-pkcs1pad.c @@ -490,7 +490,7 @@ 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; |