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staging: ccree: copy IV to DMAable memory

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We are being passed an IV buffer from unknown origin, which may be
stack allocated and thus not safe for DMA. Allocate a DMA safe
buffer for the IV and use that instead.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gilad Ben-Yossef 2017-11-02 08:10:21 +00:00 committed by Greg Kroah-Hartman
parent 42996f2d8e
commit e7cdcba451
2 changed files with 19 additions and 2 deletions
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20
drivers/staging/ccree/ssi_cipher.c
View File

@ -695,6 +695,7 @@ static int ssi_blkcipher_complete(struct device *dev,
struct ablkcipher_request *req = (struct ablkcipher_request *)areq;
ssi_buffer_mgr_unmap_blkcipher_request(dev, req_ctx, ivsize, src, dst);
kfree(req_ctx->iv);
/*Decrease the inflight counter*/
if (ctx_p->flow_mode == BYPASS && ctx_p->drvdata->inflight_counter > 0)
@ -757,6 +758,17 @@ static int ssi_blkcipher_process(
rc = 0;
goto exit_process;
}
/* The IV we are handed may be allocted from the stack so
* we must copy it to a DMAable buffer before use.
*/
req_ctx->iv = kmalloc(ivsize, GFP_KERNEL);
if (!req_ctx->iv) {
rc = -ENOMEM;
goto exit_process;
}
memcpy(req_ctx->iv, info, ivsize);
/*For CTS in case of data size aligned to 16 use CBC mode*/
if (((nbytes % AES_BLOCK_SIZE) == 0) && (ctx_p->cipher_mode == DRV_CIPHER_CBC_CTS)) {
ctx_p->cipher_mode = DRV_CIPHER_CBC;
@ -778,7 +790,9 @@ static int ssi_blkcipher_process(
/* STAT_PHASE_1: Map buffers */
rc = ssi_buffer_mgr_map_blkcipher_request(ctx_p->drvdata, req_ctx, ivsize, nbytes, info, src, dst);
rc = ssi_buffer_mgr_map_blkcipher_request(ctx_p->drvdata, req_ctx,
ivsize, nbytes, req_ctx->iv,
src, dst);
if (unlikely(rc != 0)) {
dev_err(dev, "map_request() failed\n");
goto exit_process;
@ -830,8 +844,10 @@ exit_process:
if (cts_restore_flag != 0)
ctx_p->cipher_mode = DRV_CIPHER_CBC_CTS;
if (rc != -EINPROGRESS)
if (rc != -EINPROGRESS) {
kfree(req_ctx->backup_info);
kfree(req_ctx->iv);
}
return rc;
}

1
drivers/staging/ccree/ssi_cipher.h
View File

@ -43,6 +43,7 @@ struct blkcipher_req_ctx {
u32 out_nents;
u32 out_mlli_nents;
u8 *backup_info; /*store iv for generated IV flow*/
u8 *iv;
bool is_giv;
struct mlli_params mlli_params;
};