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crypto: ccp - Limit the amount of information exported 

Since the exported information can be exposed to user-space, instead of
exporting the entire request context only export the minimum information
needed.

Cc: <stable@vger.kernel.org> # 3.14.x-
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
steinar/wifi_calib_4_9_kernel
Tom Lendacky 2016-01-29 12:45:14 -06:00 committed by Herbert Xu
parent 0529900a01
commit d1662165ae
3 changed files with 48 additions and 10 deletions
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16
drivers/crypto/ccp/ccp-crypto-aes-cmac.c
View File

@ -223,9 +223,12 @@ static int ccp_aes_cmac_digest(struct ahash_request *req)
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_req_ctx *state = out;
struct ccp_aes_cmac_exp_ctx *state = out;
*state = *rctx;
state->null_msg = rctx->null_msg;
memcpy(state->iv, rctx->iv, sizeof(state->iv));
state->buf_count = rctx->buf_count;
memcpy(state->buf, rctx->buf, sizeof(state->buf));
return 0;
}
@ -233,9 +236,12 @@ static int ccp_aes_cmac_export(struct ahash_request *req, void *out)
static int ccp_aes_cmac_import(struct ahash_request *req, const void *in)
{
struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req);
const struct ccp_aes_cmac_req_ctx *state = in;
const struct ccp_aes_cmac_exp_ctx *state = in;
*rctx = *state;
rctx->null_msg = state->null_msg;
memcpy(rctx->iv, state->iv, sizeof(rctx->iv));
rctx->buf_count = state->buf_count;
memcpy(rctx->buf, state->buf, sizeof(rctx->buf));
return 0;
}
@ -378,7 +384,7 @@ int ccp_register_aes_cmac_algs(struct list_head *head)
halg = &alg->halg;
halg->digestsize = AES_BLOCK_SIZE;
halg->statesize = sizeof(struct ccp_aes_cmac_req_ctx);
halg->statesize = sizeof(struct ccp_aes_cmac_exp_ctx);
base = &halg->base;
snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "cmac(aes)");

20
drivers/crypto/ccp/ccp-crypto-sha.c
View File

@ -210,9 +210,14 @@ static int ccp_sha_digest(struct ahash_request *req)
static int ccp_sha_export(struct ahash_request *req, void *out)
{
struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
struct ccp_sha_req_ctx *state = out;
struct ccp_sha_exp_ctx *state = out;
*state = *rctx;
state->type = rctx->type;
state->msg_bits = rctx->msg_bits;
state->first = rctx->first;
memcpy(state->ctx, rctx->ctx, sizeof(state->ctx));
state->buf_count = rctx->buf_count;
memcpy(state->buf, rctx->buf, sizeof(state->buf));
return 0;
}
@ -220,9 +225,14 @@ static int ccp_sha_export(struct ahash_request *req, void *out)
static int ccp_sha_import(struct ahash_request *req, const void *in)
{
struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
const struct ccp_sha_req_ctx *state = in;
const struct ccp_sha_exp_ctx *state = in;
*rctx = *state;
rctx->type = state->type;
rctx->msg_bits = state->msg_bits;
rctx->first = state->first;
memcpy(rctx->ctx, state->ctx, sizeof(rctx->ctx));
rctx->buf_count = state->buf_count;
memcpy(rctx->buf, state->buf, sizeof(rctx->buf));
return 0;
}
@ -428,7 +438,7 @@ static int ccp_register_sha_alg(struct list_head *head,
halg = &alg->halg;
halg->digestsize = def->digest_size;
halg->statesize = sizeof(struct ccp_sha_req_ctx);
halg->statesize = sizeof(struct ccp_sha_exp_ctx);
base = &halg->base;
snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);

22
drivers/crypto/ccp/ccp-crypto.h
View File

@ -129,6 +129,15 @@ struct ccp_aes_cmac_req_ctx {
struct ccp_cmd cmd;
};
struct ccp_aes_cmac_exp_ctx {
unsigned int null_msg;
u8 iv[AES_BLOCK_SIZE];
unsigned int buf_count;
u8 buf[AES_BLOCK_SIZE];
};
/***** SHA related defines *****/
#define MAX_SHA_CONTEXT_SIZE SHA256_DIGEST_SIZE
#define MAX_SHA_BLOCK_SIZE SHA256_BLOCK_SIZE
@ -171,6 +180,19 @@ struct ccp_sha_req_ctx {
struct ccp_cmd cmd;
};
struct ccp_sha_exp_ctx {
enum ccp_sha_type type;
u64 msg_bits;
unsigned int first;
u8 ctx[MAX_SHA_CONTEXT_SIZE];
unsigned int buf_count;
u8 buf[MAX_SHA_BLOCK_SIZE];
};
/***** Common Context Structure *****/
struct ccp_ctx {
int (*complete)(struct crypto_async_request *req, int ret);