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crypto: ccp - Validate buffer lengths for copy operations
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The CCP driver copies data between scatter/gather lists and DMA buffers.
The length of the requested copy operation must be checked against
the available destination buffer length.

Reported-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Gary R Hook authored and Herbert Xu committed Mar 16, 2018
1 parent 3d053d5 commit b698a9f
Showing 1 changed file with 78 additions and 30 deletions.
108 changes: 78 additions & 30 deletions drivers/crypto/ccp/ccp-ops.c
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Original file line number Diff line number Diff line change
Expand Up @@ -178,14 +178,18 @@ static int ccp_init_dm_workarea(struct ccp_dm_workarea *wa,
return 0;
}

static void ccp_set_dm_area(struct ccp_dm_workarea *wa, unsigned int wa_offset,
struct scatterlist *sg, unsigned int sg_offset,
unsigned int len)
static int ccp_set_dm_area(struct ccp_dm_workarea *wa, unsigned int wa_offset,
struct scatterlist *sg, unsigned int sg_offset,
unsigned int len)
{
WARN_ON(!wa->address);

if (len > (wa->length - wa_offset))
return -EINVAL;

scatterwalk_map_and_copy(wa->address + wa_offset, sg, sg_offset, len,
0);
return 0;
}

static void ccp_get_dm_area(struct ccp_dm_workarea *wa, unsigned int wa_offset,
Expand All @@ -205,8 +209,11 @@ static int ccp_reverse_set_dm_area(struct ccp_dm_workarea *wa,
unsigned int len)
{
u8 *p, *q;
int rc;

ccp_set_dm_area(wa, wa_offset, sg, sg_offset, len);
rc = ccp_set_dm_area(wa, wa_offset, sg, sg_offset, len);
if (rc)
return rc;

p = wa->address + wa_offset;
q = p + len - 1;
Expand Down Expand Up @@ -509,7 +516,9 @@ static int ccp_run_aes_cmac_cmd(struct ccp_cmd_queue *cmd_q,
return ret;

dm_offset = CCP_SB_BYTES - aes->key_len;
ccp_set_dm_area(&key, dm_offset, aes->key, 0, aes->key_len);
ret = ccp_set_dm_area(&key, dm_offset, aes->key, 0, aes->key_len);
if (ret)
goto e_key;
ret = ccp_copy_to_sb(cmd_q, &key, op.jobid, op.sb_key,
CCP_PASSTHRU_BYTESWAP_256BIT);
if (ret) {
Expand All @@ -528,7 +537,9 @@ static int ccp_run_aes_cmac_cmd(struct ccp_cmd_queue *cmd_q,
goto e_key;

dm_offset = CCP_SB_BYTES - AES_BLOCK_SIZE;
ccp_set_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);
ret = ccp_set_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);
if (ret)
goto e_ctx;
ret = ccp_copy_to_sb(cmd_q, &ctx, op.jobid, op.sb_ctx,
CCP_PASSTHRU_BYTESWAP_256BIT);
if (ret) {
Expand Down Expand Up @@ -556,8 +567,10 @@ static int ccp_run_aes_cmac_cmd(struct ccp_cmd_queue *cmd_q,
goto e_src;
}

ccp_set_dm_area(&ctx, 0, aes->cmac_key, 0,
aes->cmac_key_len);
ret = ccp_set_dm_area(&ctx, 0, aes->cmac_key, 0,
aes->cmac_key_len);
if (ret)
goto e_src;
ret = ccp_copy_to_sb(cmd_q, &ctx, op.jobid, op.sb_ctx,
CCP_PASSTHRU_BYTESWAP_256BIT);
if (ret) {
Expand Down Expand Up @@ -666,7 +679,9 @@ static int ccp_run_aes_gcm_cmd(struct ccp_cmd_queue *cmd_q,
return ret;

dm_offset = CCP_SB_BYTES - aes->key_len;
ccp_set_dm_area(&key, dm_offset, aes->key, 0, aes->key_len);
ret = ccp_set_dm_area(&key, dm_offset, aes->key, 0, aes->key_len);
if (ret)
goto e_key;
ret = ccp_copy_to_sb(cmd_q, &key, op.jobid, op.sb_key,
CCP_PASSTHRU_BYTESWAP_256BIT);
if (ret) {
Expand All @@ -685,7 +700,9 @@ static int ccp_run_aes_gcm_cmd(struct ccp_cmd_queue *cmd_q,
goto e_key;

dm_offset = CCP_AES_CTX_SB_COUNT * CCP_SB_BYTES - aes->iv_len;
ccp_set_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);
ret = ccp_set_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);
if (ret)
goto e_ctx;

ret = ccp_copy_to_sb(cmd_q, &ctx, op.jobid, op.sb_ctx,
CCP_PASSTHRU_BYTESWAP_256BIT);
Expand Down Expand Up @@ -777,7 +794,9 @@ static int ccp_run_aes_gcm_cmd(struct ccp_cmd_queue *cmd_q,
goto e_dst;
}

ccp_set_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);
ret = ccp_set_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);
if (ret)
goto e_dst;

ret = ccp_copy_to_sb(cmd_q, &ctx, op.jobid, op.sb_ctx,
CCP_PASSTHRU_BYTESWAP_256BIT);
Expand Down Expand Up @@ -820,7 +839,9 @@ static int ccp_run_aes_gcm_cmd(struct ccp_cmd_queue *cmd_q,
DMA_BIDIRECTIONAL);
if (ret)
goto e_tag;
ccp_set_dm_area(&tag, 0, p_tag, 0, AES_BLOCK_SIZE);
ret = ccp_set_dm_area(&tag, 0, p_tag, 0, AES_BLOCK_SIZE);
if (ret)
goto e_tag;

ret = memcmp(tag.address, final_wa.address, AES_BLOCK_SIZE);
ccp_dm_free(&tag);
Expand Down Expand Up @@ -914,7 +935,9 @@ static int ccp_run_aes_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
return ret;

dm_offset = CCP_SB_BYTES - aes->key_len;
ccp_set_dm_area(&key, dm_offset, aes->key, 0, aes->key_len);
ret = ccp_set_dm_area(&key, dm_offset, aes->key, 0, aes->key_len);
if (ret)
goto e_key;
ret = ccp_copy_to_sb(cmd_q, &key, op.jobid, op.sb_key,
CCP_PASSTHRU_BYTESWAP_256BIT);
if (ret) {
Expand All @@ -935,7 +958,9 @@ static int ccp_run_aes_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
if (aes->mode != CCP_AES_MODE_ECB) {
/* Load the AES context - convert to LE */
dm_offset = CCP_SB_BYTES - AES_BLOCK_SIZE;
ccp_set_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);
ret = ccp_set_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);
if (ret)
goto e_ctx;
ret = ccp_copy_to_sb(cmd_q, &ctx, op.jobid, op.sb_ctx,
CCP_PASSTHRU_BYTESWAP_256BIT);
if (ret) {
Expand Down Expand Up @@ -1113,8 +1138,12 @@ static int ccp_run_xts_aes_cmd(struct ccp_cmd_queue *cmd_q,
* big endian to little endian.
*/
dm_offset = CCP_SB_BYTES - AES_KEYSIZE_128;
ccp_set_dm_area(&key, dm_offset, xts->key, 0, xts->key_len);
ccp_set_dm_area(&key, 0, xts->key, xts->key_len, xts->key_len);
ret = ccp_set_dm_area(&key, dm_offset, xts->key, 0, xts->key_len);
if (ret)
goto e_key;
ret = ccp_set_dm_area(&key, 0, xts->key, xts->key_len, xts->key_len);
if (ret)
goto e_key;
} else {
/* Version 5 CCPs use a 512-bit space for the key: each portion
* occupies 256 bits, or one entire slot, and is zero-padded.
Expand All @@ -1123,9 +1152,13 @@ static int ccp_run_xts_aes_cmd(struct ccp_cmd_queue *cmd_q,

dm_offset = CCP_SB_BYTES;
pad = dm_offset - xts->key_len;
ccp_set_dm_area(&key, pad, xts->key, 0, xts->key_len);
ccp_set_dm_area(&key, dm_offset + pad, xts->key, xts->key_len,
xts->key_len);
ret = ccp_set_dm_area(&key, pad, xts->key, 0, xts->key_len);
if (ret)
goto e_key;
ret = ccp_set_dm_area(&key, dm_offset + pad, xts->key,
xts->key_len, xts->key_len);
if (ret)
goto e_key;
}
ret = ccp_copy_to_sb(cmd_q, &key, op.jobid, op.sb_key,
CCP_PASSTHRU_BYTESWAP_256BIT);
Expand All @@ -1144,7 +1177,9 @@ static int ccp_run_xts_aes_cmd(struct ccp_cmd_queue *cmd_q,
if (ret)
goto e_key;

ccp_set_dm_area(&ctx, 0, xts->iv, 0, xts->iv_len);
ret = ccp_set_dm_area(&ctx, 0, xts->iv, 0, xts->iv_len);
if (ret)
goto e_ctx;
ret = ccp_copy_to_sb(cmd_q, &ctx, op.jobid, op.sb_ctx,
CCP_PASSTHRU_BYTESWAP_NOOP);
if (ret) {
Expand Down Expand Up @@ -1287,12 +1322,18 @@ static int ccp_run_des3_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
dm_offset = CCP_SB_BYTES - des3->key_len; /* Basic offset */

len_singlekey = des3->key_len / 3;
ccp_set_dm_area(&key, dm_offset + 2 * len_singlekey,
des3->key, 0, len_singlekey);
ccp_set_dm_area(&key, dm_offset + len_singlekey,
des3->key, len_singlekey, len_singlekey);
ccp_set_dm_area(&key, dm_offset,
des3->key, 2 * len_singlekey, len_singlekey);
ret = ccp_set_dm_area(&key, dm_offset + 2 * len_singlekey,
des3->key, 0, len_singlekey);
if (ret)
goto e_key;
ret = ccp_set_dm_area(&key, dm_offset + len_singlekey,
des3->key, len_singlekey, len_singlekey);
if (ret)
goto e_key;
ret = ccp_set_dm_area(&key, dm_offset,
des3->key, 2 * len_singlekey, len_singlekey);
if (ret)
goto e_key;

/* Copy the key to the SB */
ret = ccp_copy_to_sb(cmd_q, &key, op.jobid, op.sb_key,
Expand Down Expand Up @@ -1320,7 +1361,10 @@ static int ccp_run_des3_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)

/* Load the context into the LSB */
dm_offset = CCP_SB_BYTES - des3->iv_len;
ccp_set_dm_area(&ctx, dm_offset, des3->iv, 0, des3->iv_len);
ret = ccp_set_dm_area(&ctx, dm_offset, des3->iv, 0,
des3->iv_len);
if (ret)
goto e_ctx;

if (cmd_q->ccp->vdata->version == CCP_VERSION(3, 0))
load_mode = CCP_PASSTHRU_BYTESWAP_NOOP;
Expand Down Expand Up @@ -1604,8 +1648,10 @@ static int ccp_run_sha_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
}
} else {
/* Restore the context */
ccp_set_dm_area(&ctx, 0, sha->ctx, 0,
sb_count * CCP_SB_BYTES);
ret = ccp_set_dm_area(&ctx, 0, sha->ctx, 0,
sb_count * CCP_SB_BYTES);
if (ret)
goto e_ctx;
}

ret = ccp_copy_to_sb(cmd_q, &ctx, op.jobid, op.sb_ctx,
Expand Down Expand Up @@ -1927,7 +1973,9 @@ static int ccp_run_passthru_cmd(struct ccp_cmd_queue *cmd_q,
if (ret)
return ret;

ccp_set_dm_area(&mask, 0, pt->mask, 0, pt->mask_len);
ret = ccp_set_dm_area(&mask, 0, pt->mask, 0, pt->mask_len);
if (ret)
goto e_mask;
ret = ccp_copy_to_sb(cmd_q, &mask, op.jobid, op.sb_key,
CCP_PASSTHRU_BYTESWAP_NOOP);
if (ret) {
Expand Down

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