* [PATCH] iscsi-target: Make buf param of iscsit_do_crypto_hash_buf() const void *
@ 2013-05-03 21:15 Geert Uytterhoeven
2013-05-03 21:22 ` Geert Uytterhoeven
2013-05-03 23:54 ` Nicholas A. Bellinger
0 siblings, 2 replies; 5+ messages in thread
From: Geert Uytterhoeven @ 2013-05-03 21:15 UTC (permalink / raw)
To: Nicholas A. Bellinger
Cc: linux-scsi, target-devel, linux-kernel, Geert Uytterhoeven
Make the "buf" input param of iscsit_do_crypto_hash_buf() "const void *".
This allows to remove lots of casts in its callers.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
drivers/target/iscsi/iscsi_target.c | 57 ++++++++++++++---------------------
1 files changed, 23 insertions(+), 34 deletions(-)
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index ffbc6a9..721ecc5 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -1250,7 +1250,7 @@ static u32 iscsit_do_crypto_hash_sg(
static void iscsit_do_crypto_hash_buf(
struct hash_desc *hash,
- unsigned char *buf,
+ const void *buf,
u32 payload_length,
u32 padding,
u8 *pad_bytes,
@@ -2524,9 +2524,8 @@ static int iscsit_send_conn_drop_async_message(
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
- iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
- (unsigned char *)hdr, ISCSI_HDR_LEN,
- 0, NULL, (u8 *)header_digest);
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
+ ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
cmd->tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32C HeaderDigest to"
@@ -2662,9 +2661,8 @@ static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
- iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
- (unsigned char *)cmd->pdu, ISCSI_HDR_LEN,
- 0, NULL, (u8 *)header_digest);
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
+ ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
iov[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
@@ -2841,9 +2839,8 @@ iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
- iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
- (unsigned char *)&cmd->pdu[0], ISCSI_HDR_LEN,
- 0, NULL, (u8 *)header_digest);
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
+ ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
iov[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
@@ -2900,9 +2897,8 @@ static int iscsit_send_unsolicited_nopin(
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
- iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
- (unsigned char *)hdr, ISCSI_HDR_LEN,
- 0, NULL, (u8 *)header_digest);
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
+ ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching CRC32C HeaderDigest to"
@@ -2949,9 +2945,8 @@ iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
- iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
- (unsigned char *)hdr, ISCSI_HDR_LEN,
- 0, NULL, (u8 *)header_digest);
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
+ ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
iov[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
@@ -3040,9 +3035,8 @@ static int iscsit_send_r2t(
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
- iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
- (unsigned char *)hdr, ISCSI_HDR_LEN,
- 0, NULL, (u8 *)header_digest);
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
+ ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
@@ -3256,9 +3250,8 @@ static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
- iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
- (unsigned char *)cmd->pdu, ISCSI_HDR_LEN,
- 0, NULL, (u8 *)header_digest);
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
+ ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
iov[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
@@ -3329,9 +3322,8 @@ iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
- iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
- (unsigned char *)hdr, ISCSI_HDR_LEN,
- 0, NULL, (u8 *)header_digest);
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
+ ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
@@ -3504,9 +3496,8 @@ static int iscsit_send_text_rsp(
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
- iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
- (unsigned char *)hdr, ISCSI_HDR_LEN,
- 0, NULL, (u8 *)header_digest);
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
+ ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
iov[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
@@ -3574,9 +3565,8 @@ static int iscsit_send_reject(
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
- iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
- (unsigned char *)hdr, ISCSI_HDR_LEN,
- 0, NULL, (u8 *)header_digest);
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
+ ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
iov[0].iov_len += ISCSI_CRC_LEN;
tx_size += ISCSI_CRC_LEN;
@@ -3585,9 +3575,8 @@ static int iscsit_send_reject(
}
if (conn->conn_ops->DataDigest) {
- iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
- (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
- 0, NULL, (u8 *)&cmd->data_crc);
+ iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
+ ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
iov[iov_count].iov_base = &cmd->data_crc;
iov[iov_count++].iov_len = ISCSI_CRC_LEN;
--
1.7.0.4
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] iscsi-target: Make buf param of iscsit_do_crypto_hash_buf() const void *
2013-05-03 21:15 [PATCH] iscsi-target: Make buf param of iscsit_do_crypto_hash_buf() const void * Geert Uytterhoeven
@ 2013-05-03 21:22 ` Geert Uytterhoeven
2013-05-04 0:16 ` Nicholas A. Bellinger
2013-05-03 23:54 ` Nicholas A. Bellinger
1 sibling, 1 reply; 5+ messages in thread
From: Geert Uytterhoeven @ 2013-05-03 21:22 UTC (permalink / raw)
To: Nicholas A. Bellinger
Cc: scsi, target-devel, linux-kernel, Geert Uytterhoeven
On Fri, May 3, 2013 at 11:15 PM, Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
> --- a/drivers/target/iscsi/iscsi_target.c
> +++ b/drivers/target/iscsi/iscsi_target.c
> @@ -3585,9 +3575,8 @@ static int iscsit_send_reject(
> }
>
> if (conn->conn_ops->DataDigest) {
> - iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
> - (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
> - 0, NULL, (u8 *)&cmd->data_crc);
> + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
> + ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
BTW, there are serious issues with casting pointers to u32s to pointers to u8s
for the last two output parameters of iscsit_do_crypto_hash_buf() (pad_bytes
and data_crc):
1. It's not endian-safe,
2. In many cases, the original u32 was not initialized at all, so the other 24
bits contain garbage. This will cause 32-bit comparisons like
if (checksum != data_crc)
to fail in unpredictable ways.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] iscsi-target: Make buf param of iscsit_do_crypto_hash_buf() const void *
2013-05-03 21:15 [PATCH] iscsi-target: Make buf param of iscsit_do_crypto_hash_buf() const void * Geert Uytterhoeven
2013-05-03 21:22 ` Geert Uytterhoeven
@ 2013-05-03 23:54 ` Nicholas A. Bellinger
1 sibling, 0 replies; 5+ messages in thread
From: Nicholas A. Bellinger @ 2013-05-03 23:54 UTC (permalink / raw)
To: Geert Uytterhoeven; +Cc: linux-scsi, target-devel, linux-kernel
On Fri, 2013-05-03 at 23:15 +0200, Geert Uytterhoeven wrote:
> Make the "buf" input param of iscsit_do_crypto_hash_buf() "const void *".
> This allows to remove lots of casts in its callers.
>
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
> ---
Applied to target-pending/queue.
Thanks Geert!
--nab
> drivers/target/iscsi/iscsi_target.c | 57 ++++++++++++++---------------------
> 1 files changed, 23 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
> index ffbc6a9..721ecc5 100644
> --- a/drivers/target/iscsi/iscsi_target.c
> +++ b/drivers/target/iscsi/iscsi_target.c
> @@ -1250,7 +1250,7 @@ static u32 iscsit_do_crypto_hash_sg(
>
> static void iscsit_do_crypto_hash_buf(
> struct hash_desc *hash,
> - unsigned char *buf,
> + const void *buf,
> u32 payload_length,
> u32 padding,
> u8 *pad_bytes,
> @@ -2524,9 +2524,8 @@ static int iscsit_send_conn_drop_async_message(
> if (conn->conn_ops->HeaderDigest) {
> u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
>
> - iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
> - (unsigned char *)hdr, ISCSI_HDR_LEN,
> - 0, NULL, (u8 *)header_digest);
> + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
> + ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
>
> cmd->tx_size += ISCSI_CRC_LEN;
> pr_debug("Attaching CRC32C HeaderDigest to"
> @@ -2662,9 +2661,8 @@ static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
> if (conn->conn_ops->HeaderDigest) {
> u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
>
> - iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
> - (unsigned char *)cmd->pdu, ISCSI_HDR_LEN,
> - 0, NULL, (u8 *)header_digest);
> + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
> + ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
>
> iov[0].iov_len += ISCSI_CRC_LEN;
> tx_size += ISCSI_CRC_LEN;
> @@ -2841,9 +2839,8 @@ iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
> if (conn->conn_ops->HeaderDigest) {
> u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
>
> - iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
> - (unsigned char *)&cmd->pdu[0], ISCSI_HDR_LEN,
> - 0, NULL, (u8 *)header_digest);
> + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
> + ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
>
> iov[0].iov_len += ISCSI_CRC_LEN;
> tx_size += ISCSI_CRC_LEN;
> @@ -2900,9 +2897,8 @@ static int iscsit_send_unsolicited_nopin(
> if (conn->conn_ops->HeaderDigest) {
> u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
>
> - iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
> - (unsigned char *)hdr, ISCSI_HDR_LEN,
> - 0, NULL, (u8 *)header_digest);
> + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
> + ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
>
> tx_size += ISCSI_CRC_LEN;
> pr_debug("Attaching CRC32C HeaderDigest to"
> @@ -2949,9 +2945,8 @@ iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
> if (conn->conn_ops->HeaderDigest) {
> u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
>
> - iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
> - (unsigned char *)hdr, ISCSI_HDR_LEN,
> - 0, NULL, (u8 *)header_digest);
> + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
> + ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
>
> iov[0].iov_len += ISCSI_CRC_LEN;
> tx_size += ISCSI_CRC_LEN;
> @@ -3040,9 +3035,8 @@ static int iscsit_send_r2t(
> if (conn->conn_ops->HeaderDigest) {
> u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
>
> - iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
> - (unsigned char *)hdr, ISCSI_HDR_LEN,
> - 0, NULL, (u8 *)header_digest);
> + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
> + ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
>
> cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
> tx_size += ISCSI_CRC_LEN;
> @@ -3256,9 +3250,8 @@ static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
> if (conn->conn_ops->HeaderDigest) {
> u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
>
> - iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
> - (unsigned char *)cmd->pdu, ISCSI_HDR_LEN,
> - 0, NULL, (u8 *)header_digest);
> + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
> + ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
>
> iov[0].iov_len += ISCSI_CRC_LEN;
> tx_size += ISCSI_CRC_LEN;
> @@ -3329,9 +3322,8 @@ iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
> if (conn->conn_ops->HeaderDigest) {
> u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
>
> - iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
> - (unsigned char *)hdr, ISCSI_HDR_LEN,
> - 0, NULL, (u8 *)header_digest);
> + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
> + ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
>
> cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
> tx_size += ISCSI_CRC_LEN;
> @@ -3504,9 +3496,8 @@ static int iscsit_send_text_rsp(
> if (conn->conn_ops->HeaderDigest) {
> u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
>
> - iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
> - (unsigned char *)hdr, ISCSI_HDR_LEN,
> - 0, NULL, (u8 *)header_digest);
> + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
> + ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
>
> iov[0].iov_len += ISCSI_CRC_LEN;
> tx_size += ISCSI_CRC_LEN;
> @@ -3574,9 +3565,8 @@ static int iscsit_send_reject(
> if (conn->conn_ops->HeaderDigest) {
> u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
>
> - iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
> - (unsigned char *)hdr, ISCSI_HDR_LEN,
> - 0, NULL, (u8 *)header_digest);
> + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
> + ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
>
> iov[0].iov_len += ISCSI_CRC_LEN;
> tx_size += ISCSI_CRC_LEN;
> @@ -3585,9 +3575,8 @@ static int iscsit_send_reject(
> }
>
> if (conn->conn_ops->DataDigest) {
> - iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
> - (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
> - 0, NULL, (u8 *)&cmd->data_crc);
> + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
> + ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
>
> iov[iov_count].iov_base = &cmd->data_crc;
> iov[iov_count++].iov_len = ISCSI_CRC_LEN;
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] iscsi-target: Make buf param of iscsit_do_crypto_hash_buf() const void *
2013-05-03 21:22 ` Geert Uytterhoeven
@ 2013-05-04 0:16 ` Nicholas A. Bellinger
2013-05-05 9:35 ` Geert Uytterhoeven
0 siblings, 1 reply; 5+ messages in thread
From: Nicholas A. Bellinger @ 2013-05-04 0:16 UTC (permalink / raw)
To: Geert Uytterhoeven; +Cc: scsi, target-devel, linux-kernel
On Fri, 2013-05-03 at 23:22 +0200, Geert Uytterhoeven wrote:
> On Fri, May 3, 2013 at 11:15 PM, Geert Uytterhoeven
> <geert@linux-m68k.org> wrote:
> > --- a/drivers/target/iscsi/iscsi_target.c
> > +++ b/drivers/target/iscsi/iscsi_target.c
>
> > @@ -3585,9 +3575,8 @@ static int iscsit_send_reject(
> > }
> >
> > if (conn->conn_ops->DataDigest) {
> > - iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
> > - (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
> > - 0, NULL, (u8 *)&cmd->data_crc);
> > + iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
> > + ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
>
> BTW, there are serious issues with casting pointers to u32s to pointers to u8s
> for the last two output parameters of iscsit_do_crypto_hash_buf() (pad_bytes
> and data_crc):
> 1. It's not endian-safe,
> 2. In many cases, the original u32 was not initialized at all, so the other 24
> bits contain garbage. This will cause 32-bit comparisons like
>
> if (checksum != data_crc)
>
> to fail in unpredictable ways.
>
Ugh, I can see how that would be problematic for BE..
Changing these to use u8 data_crc[ISCSI_DIGEST_SIZE] and
pad_bytes[ISCSI_PAD_LEN] now, and will post a patch soon.
Thanks again,
--nab
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] iscsi-target: Make buf param of iscsit_do_crypto_hash_buf() const void *
2013-05-04 0:16 ` Nicholas A. Bellinger
@ 2013-05-05 9:35 ` Geert Uytterhoeven
0 siblings, 0 replies; 5+ messages in thread
From: Geert Uytterhoeven @ 2013-05-05 9:35 UTC (permalink / raw)
To: Nicholas A. Bellinger; +Cc: scsi, target-devel, linux-kernel
On Sat, May 4, 2013 at 2:16 AM, Nicholas A. Bellinger
<nab@linux-iscsi.org> wrote:
>> BTW, there are serious issues with casting pointers to u32s to pointers to u8s
>> for the last two output parameters of iscsit_do_crypto_hash_buf() (pad_bytes
>> and data_crc):
>> 1. It's not endian-safe,
>> 2. In many cases, the original u32 was not initialized at all, so the other 24
>> bits contain garbage. This will cause 32-bit comparisons like
>>
>> if (checksum != data_crc)
>>
>> to fail in unpredictable ways.
Upon closer look, this issue is moot. But the code is confusing for the casual
reader, due to the casts
Changing the "u8 *pad_bytes" parameters to "const void *pad_bytes"
(which is what sg_init_one() takes anyway) should allow you to get rid of the
casts for pad_bytes.
For data_crc, the issue is that crypto_hash_final() takes a "u8 *out",
instead of a "void *out". Still, it's better to move the cast inside
iscsit_do_crypto_hash_buf(), so it's in one place only.
> Ugh, I can see how that would be problematic for BE..
>
> Changing these to use u8 data_crc[ISCSI_DIGEST_SIZE] and
> pad_bytes[ISCSI_PAD_LEN] now, and will post a patch soon.
That's another good idea.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 5+ messages in thread
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2013-05-03 21:15 [PATCH] iscsi-target: Make buf param of iscsit_do_crypto_hash_buf() const void * Geert Uytterhoeven
2013-05-03 21:22 ` Geert Uytterhoeven
2013-05-04 0:16 ` Nicholas A. Bellinger
2013-05-05 9:35 ` Geert Uytterhoeven
2013-05-03 23:54 ` Nicholas A. Bellinger
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