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| author |   Cfir Cohen <cfir@google.com> | 2019-07-02 10:32:56 -0700 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2019-07-18 13:39:54 +0800 |
| commit | 538a5a072e6ef04377b180ee9b3ce5bae0a85da4 (patch) | |
| tree | 7aed90b4c1ecb0291a9d17523d4bc87fec505b44 /drivers/crypto/ccp/ccp-ops.c | |
| parent | crypto: ccp - memset structure fields to zero before reuse (diff) | |
| download | linux-dev-538a5a072e6ef04377b180ee9b3ce5bae0a85da4.tar.xz linux-dev-538a5a072e6ef04377b180ee9b3ce5bae0a85da4.zip | |
crypto: ccp/gcm - use const time tag comparison.
Avoid leaking GCM tag through timing side channel.
Fixes: 36cf515b9bbe ("crypto: ccp - Enable support for AES GCM on v5 CCPs")
Cc: <stable@vger.kernel.org> # v4.12+
Signed-off-by: Cfir Cohen <cfir@google.com>
Acked-by: Gary R Hook <ghook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to '')
| -rw-r--r-- | drivers/crypto/ccp/ccp-ops.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/crypto/ccp/ccp-ops.c b/drivers/crypto/ccp/ccp-ops.c index 9ecc1bb4b237..3ebe031773d5 100644 --- a/drivers/crypto/ccp/ccp-ops.c +++ b/drivers/crypto/ccp/ccp-ops.c @@ -850,7 +850,8 @@ static int ccp_run_aes_gcm_cmd(struct ccp_cmd_queue *cmd_q, if (ret) goto e_tag; - ret = memcmp(tag.address, final_wa.address, AES_BLOCK_SIZE); + ret = crypto_memneq(tag.address, final_wa.address, + AES_BLOCK_SIZE) ? -EBADMSG : 0; ccp_dm_free(&tag); } |