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Subject[PATCH 3.16 044/148] scsi: core: scsi_trace: Use get_unaligned_be*()
3.16.82-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Bart Van Assche <bvanassche@acm.org>

commit b1335f5b0486f61fb66b123b40f8e7a98e49605d upstream.

This patch fixes an unintended sign extension on left shifts. From Colin
King: "Shifting a u8 left will cause the value to be promoted to an
integer. If the top bit of the u8 is set then the following conversion to
an u64 will sign extend the value causing the upper 32 bits to be set in
the result."

Fix this by using get_unaligned_be*() instead.

Fixes: bf8162354233 ("[SCSI] add scsi trace core functions and put trace points")
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Link: https://lore.kernel.org/r/20191101211447.187151-1-bvanassche@acm.org
Reported-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/scsi/scsi_trace.c | 114 ++++++++++++--------------------------
1 file changed, 34 insertions(+), 80 deletions(-)

--- a/drivers/scsi/scsi_trace.c
+++ b/drivers/scsi/scsi_trace.c
@@ -17,10 +17,11 @@
*/
#include <linux/kernel.h>
#include <linux/trace_seq.h>
+#include <asm/unaligned.h>
#include <trace/events/scsi.h>

#define SERVICE_ACTION16(cdb) (cdb[1] & 0x1f)
-#define SERVICE_ACTION32(cdb) ((cdb[8] << 8) | cdb[9])
+#define SERVICE_ACTION32(cdb) (get_unaligned_be16(&cdb[8]))

static const char *
scsi_trace_misc(struct trace_seq *, unsigned char *, int);
@@ -47,17 +48,12 @@ static const char *
scsi_trace_rw10(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = p->buffer + p->len;
- sector_t lba = 0, txlen = 0;
+ u32 lba, txlen;

- lba |= (cdb[2] << 24);
- lba |= (cdb[3] << 16);
- lba |= (cdb[4] << 8);
- lba |= cdb[5];
- txlen |= (cdb[7] << 8);
- txlen |= cdb[8];
+ lba = get_unaligned_be32(&cdb[2]);
+ txlen = get_unaligned_be16(&cdb[7]);

- trace_seq_printf(p, "lba=%llu txlen=%llu protect=%u",
- (unsigned long long)lba, (unsigned long long)txlen,
+ trace_seq_printf(p, "lba=%u txlen=%u protect=%u", lba, txlen,
cdb[1] >> 5);

if (cdb[0] == WRITE_SAME)
@@ -72,19 +68,12 @@ static const char *
scsi_trace_rw12(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = p->buffer + p->len;
- sector_t lba = 0, txlen = 0;
+ u32 lba, txlen;

- lba |= (cdb[2] << 24);
- lba |= (cdb[3] << 16);
- lba |= (cdb[4] << 8);
- lba |= cdb[5];
- txlen |= (cdb[6] << 24);
- txlen |= (cdb[7] << 16);
- txlen |= (cdb[8] << 8);
- txlen |= cdb[9];
+ lba = get_unaligned_be32(&cdb[2]);
+ txlen = get_unaligned_be32(&cdb[6]);

- trace_seq_printf(p, "lba=%llu txlen=%llu protect=%u",
- (unsigned long long)lba, (unsigned long long)txlen,
+ trace_seq_printf(p, "lba=%u txlen=%u protect=%u", lba, txlen,
cdb[1] >> 5);
trace_seq_putc(p, 0);

@@ -95,23 +84,13 @@ static const char *
scsi_trace_rw16(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = p->buffer + p->len;
- sector_t lba = 0, txlen = 0;
+ u64 lba;
+ u32 txlen;

- lba |= ((u64)cdb[2] << 56);
- lba |= ((u64)cdb[3] << 48);
- lba |= ((u64)cdb[4] << 40);
- lba |= ((u64)cdb[5] << 32);
- lba |= (cdb[6] << 24);
- lba |= (cdb[7] << 16);
- lba |= (cdb[8] << 8);
- lba |= cdb[9];
- txlen |= (cdb[10] << 24);
- txlen |= (cdb[11] << 16);
- txlen |= (cdb[12] << 8);
- txlen |= cdb[13];
+ lba = get_unaligned_be64(&cdb[2]);
+ txlen = get_unaligned_be32(&cdb[10]);

- trace_seq_printf(p, "lba=%llu txlen=%llu protect=%u",
- (unsigned long long)lba, (unsigned long long)txlen,
+ trace_seq_printf(p, "lba=%llu txlen=%u protect=%u", lba, txlen,
cdb[1] >> 5);

if (cdb[0] == WRITE_SAME_16)
@@ -126,8 +105,8 @@ static const char *
scsi_trace_rw32(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = p->buffer + p->len, *cmd;
- sector_t lba = 0, txlen = 0;
- u32 ei_lbrt = 0;
+ u64 lba;
+ u32 ei_lbrt, txlen;

switch (SERVICE_ACTION32(cdb)) {
case READ_32:
@@ -147,26 +126,12 @@ scsi_trace_rw32(struct trace_seq *p, uns
goto out;
}

- lba |= ((u64)cdb[12] << 56);
- lba |= ((u64)cdb[13] << 48);
- lba |= ((u64)cdb[14] << 40);
- lba |= ((u64)cdb[15] << 32);
- lba |= (cdb[16] << 24);
- lba |= (cdb[17] << 16);
- lba |= (cdb[18] << 8);
- lba |= cdb[19];
- ei_lbrt |= (cdb[20] << 24);
- ei_lbrt |= (cdb[21] << 16);
- ei_lbrt |= (cdb[22] << 8);
- ei_lbrt |= cdb[23];
- txlen |= (cdb[28] << 24);
- txlen |= (cdb[29] << 16);
- txlen |= (cdb[30] << 8);
- txlen |= cdb[31];
-
- trace_seq_printf(p, "%s_32 lba=%llu txlen=%llu protect=%u ei_lbrt=%u",
- cmd, (unsigned long long)lba,
- (unsigned long long)txlen, cdb[10] >> 5, ei_lbrt);
+ lba = get_unaligned_be64(&cdb[12]);
+ ei_lbrt = get_unaligned_be32(&cdb[20]);
+ txlen = get_unaligned_be32(&cdb[28]);
+
+ trace_seq_printf(p, "%s_32 lba=%llu txlen=%u protect=%u ei_lbrt=%u",
+ cmd, lba, txlen, cdb[10] >> 5, ei_lbrt);

if (SERVICE_ACTION32(cdb) == WRITE_SAME_32)
trace_seq_printf(p, " unmap=%u", cdb[10] >> 3 & 1);
@@ -181,7 +146,7 @@ static const char *
scsi_trace_unmap(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = p->buffer + p->len;
- unsigned int regions = cdb[7] << 8 | cdb[8];
+ unsigned int regions = get_unaligned_be16(&cdb[7]);

trace_seq_printf(p, "regions=%u", (regions - 8) / 16);
trace_seq_putc(p, 0);
@@ -193,8 +158,8 @@ static const char *
scsi_trace_service_action_in(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = p->buffer + p->len, *cmd;
- sector_t lba = 0;
- u32 alloc_len = 0;
+ u64 lba;
+ u32 alloc_len;

switch (SERVICE_ACTION16(cdb)) {
case SAI_READ_CAPACITY_16:
@@ -208,21 +173,10 @@ scsi_trace_service_action_in(struct trac
goto out;
}

- lba |= ((u64)cdb[2] << 56);
- lba |= ((u64)cdb[3] << 48);
- lba |= ((u64)cdb[4] << 40);
- lba |= ((u64)cdb[5] << 32);
- lba |= (cdb[6] << 24);
- lba |= (cdb[7] << 16);
- lba |= (cdb[8] << 8);
- lba |= cdb[9];
- alloc_len |= (cdb[10] << 24);
- alloc_len |= (cdb[11] << 16);
- alloc_len |= (cdb[12] << 8);
- alloc_len |= cdb[13];
+ lba = get_unaligned_be64(&cdb[2]);
+ alloc_len = get_unaligned_be32(&cdb[10]);

- trace_seq_printf(p, "%s lba=%llu alloc_len=%u", cmd,
- (unsigned long long)lba, alloc_len);
+ trace_seq_printf(p, "%s lba=%llu alloc_len=%u", cmd, lba, alloc_len);

out:
trace_seq_putc(p, 0);
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