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crypto: ccp - Prevent information leakage on export

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Prevent information from leaking to userspace by doing a memset to 0 of
the export state structure before setting the structure values and copying
it. This prevents un-initialized padding areas from being copied into the
export area.

Cc: <stable@vger.kernel.org> # 3.14.x-
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tom Lendacky 2016-04-13 10:52:25 -05:00 committed by Herbert Xu
parent 0851561d9c
commit f709b45ec4
2 changed files with 6 additions and 0 deletions
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3
drivers/crypto/ccp/ccp-crypto-aes-cmac.c
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@ -225,6 +225,9 @@ static int ccp_aes_cmac_export(struct ahash_request *req, void *out)
struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
struct ccp_aes_cmac_exp_ctx state;
/* Don't let anything leak to 'out' */
memset(&state, 0, sizeof(state));
state.null_msg = rctx->null_msg;
memcpy(state.iv, rctx->iv, sizeof(state.iv));
state.buf_count = rctx->buf_count;

3
drivers/crypto/ccp/ccp-crypto-sha.c
View File

@ -212,6 +212,9 @@ static int ccp_sha_export(struct ahash_request *req, void *out)
struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
struct ccp_sha_exp_ctx state;
/* Don't let anything leak to 'out' */
memset(&state, 0, sizeof(state));
state.type = rctx->type;
state.msg_bits = rctx->msg_bits;
state.first = rctx->first;