lkml.org 
[lkml]   [2016]   [Apr]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.4 076/210] crypto: ccp - Dont assume export/import areas are aligned
Date
4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tom Lendacky <thomas.lendacky@amd.com>

commit b31dde2a5cb1bf764282abf934266b7193c2bc7c upstream.

Use a local variable for the exported and imported state so that
alignment is not an issue. On export, set a local variable from the
request context and then memcpy the contents of the local variable to
the export memory area. On import, memcpy the import memory area into
a local variable and then use the local variable to set the request
context.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/crypto/ccp/ccp-crypto-aes-cmac.c | 26 ++++++++++++++---------
drivers/crypto/ccp/ccp-crypto-sha.c | 34 ++++++++++++++++++-------------
2 files changed, 36 insertions(+), 24 deletions(-)

--- a/drivers/crypto/ccp/ccp-crypto-aes-cmac.c
+++ b/drivers/crypto/ccp/ccp-crypto-aes-cmac.c
@@ -223,12 +223,15 @@ static int ccp_aes_cmac_digest(struct ah
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 = out;
+ struct ccp_aes_cmac_exp_ctx state;

- 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));
+ 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));
+
+ /* 'out' may not be aligned so memcpy from local variable */
+ memcpy(out, &state, sizeof(state));

return 0;
}
@@ -236,12 +239,15 @@ static int ccp_aes_cmac_export(struct ah
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_exp_ctx *state = in;
+ struct ccp_aes_cmac_exp_ctx state;
+
+ /* 'in' may not be aligned so memcpy to local variable */
+ memcpy(&state, in, sizeof(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));
+ 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;
}
--- a/drivers/crypto/ccp/ccp-crypto-sha.c
+++ b/drivers/crypto/ccp/ccp-crypto-sha.c
@@ -210,14 +210,17 @@ static int ccp_sha_digest(struct ahash_r
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 = out;
+ struct ccp_sha_exp_ctx state;

- 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));
+ 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));
+
+ /* 'out' may not be aligned so memcpy from local variable */
+ memcpy(out, &state, sizeof(state));

return 0;
}
@@ -225,14 +228,17 @@ static int ccp_sha_export(struct ahash_r
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_exp_ctx *state = in;
+ struct ccp_sha_exp_ctx state;
+
+ /* 'in' may not be aligned so memcpy to local variable */
+ memcpy(&state, in, sizeof(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));
+ 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;
}

\
 
 \ /
  Last update: 2016-04-10 22:21    [W:0.514 / U:0.680 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site