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| Started by | Luis Henriques <luis.henriques@canonical.com> |
|---|---|
| First post | 2016-01-06 11:50 +0100 |
| Last post | 2016-01-06 11:50 +0100 |
| Articles | 1 — 1 participant |
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[PATCH 3.16.y-ckt 102/126] crypto: nx - Fix timing leak in GCM and CCM decryption Luis Henriques <luis.henriques@canonical.com> - 2016-01-06 11:50 +0100
| From | Luis Henriques <luis.henriques@canonical.com> |
|---|---|
| Date | 2016-01-06 11:50 +0100 |
| Subject | [PATCH 3.16.y-ckt 102/126] crypto: nx - Fix timing leak in GCM and CCM decryption |
| Message-ID | <qNTPb-8o8-1@gated-at.bofh.it> |
3.16.7-ckt22 -stable review patch. If anyone has any objections, please let me know. ------------------ From: David Gstir <david@sigma-star.at> commit cb8affb55c7e64816f3effcd9b2fc3268c016fac 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 <david@sigma-star.at> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> [ luis: backported to 3.16: adjusted context ] Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- drivers/crypto/nx/nx-aes-ccm.c | 2 +- drivers/crypto/nx/nx-aes-gcm.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/crypto/nx/nx-aes-ccm.c b/drivers/crypto/nx/nx-aes-ccm.c index 5ecd4c2414aa..b1679db09de2 100644 --- a/drivers/crypto/nx/nx-aes-ccm.c +++ b/drivers/crypto/nx/nx-aes-ccm.c @@ -411,7 +411,7 @@ static int ccm_nx_decrypt(struct aead_request *req, processed += to_process; } while (processed < nbytes); - rc = memcmp(csbcpb->cpb.aes_ccm.out_pat_or_mac, priv->oauth_tag, + rc = crypto_memneq(csbcpb->cpb.aes_ccm.out_pat_or_mac, priv->oauth_tag, authsize) ? -EBADMSG : 0; out: spin_unlock_irqrestore(&nx_ctx->lock, irq_flags); diff --git a/drivers/crypto/nx/nx-aes-gcm.c b/drivers/crypto/nx/nx-aes-gcm.c index 025d9a8d5b19..dd4431ea1376 100644 --- a/drivers/crypto/nx/nx-aes-gcm.c +++ b/drivers/crypto/nx/nx-aes-gcm.c @@ -415,7 +415,7 @@ mac: scatterwalk_map_and_copy(itag, req->src, nbytes, crypto_aead_authsize(crypto_aead_reqtfm(req)), SCATTERWALK_FROM_SG); - rc = memcmp(itag, otag, + rc = crypto_memneq(itag, otag, crypto_aead_authsize(crypto_aead_reqtfm(req))) ? -EBADMSG : 0; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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