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| author | Cfir Cohen <cfir@google.com> | 2019-07-02 20:32:56 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-26 10:12:54 +0300 |
| commit | bb6b587e64ac2e067d9b246e3c2ce3d1ddd712b1 (patch) | |
| tree | 568fda3aa833b237b785ead5dd2e3e5829378f66 /drivers | |
| parent | 706393e2e920964a28e14b8a0e5ce1d89fd0aecf (diff) | |
| download | linux-bb6b587e64ac2e067d9b246e3c2ce3d1ddd712b1.tar.xz | |
crypto: ccp/gcm - use const time tag comparison.
commit 538a5a072e6ef04377b180ee9b3ce5bae0a85da4 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -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 717f5551fa83..a17de7c9841b 100644 --- a/drivers/crypto/ccp/ccp-ops.c +++ b/drivers/crypto/ccp/ccp-ops.c @@ -853,7 +853,8 @@ 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); } |