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linux/drivers/scsi/scsi_trace.c
Bart Van Assche b1335f5b04 scsi: core: scsi_trace: Use get_unaligned_be*() 
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: bf81623542 ("[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>
2019-11-01 20:28:03 -04:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2010 FUJITSU LIMITED
* Copyright (C) 2010 Tomohiro Kusumi <kusumi.tomohiro@jp.fujitsu.com>
*/
#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) (get_unaligned_be16(&cdb[8]))
static const char *
scsi_trace_misc(struct trace_seq *, unsigned char *, int);
static const char *
scsi_trace_rw6(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p);
sector_t lba = 0, txlen = 0;
lba |= ((cdb[1] & 0x1F) << 16);
lba |= (cdb[2] << 8);
lba |= cdb[3];
txlen = cdb[4];
trace_seq_printf(p, "lba=%llu txlen=%llu",
(unsigned long long)lba, (unsigned long long)txlen);
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_rw10(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p);
u32 lba, txlen;
lba = get_unaligned_be32(&cdb[2]);
txlen = get_unaligned_be16(&cdb[7]);
trace_seq_printf(p, "lba=%u txlen=%u protect=%u", lba, txlen,
cdb[1] >> 5);
if (cdb[0] == WRITE_SAME)
trace_seq_printf(p, " unmap=%u", cdb[1] >> 3 & 1);
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_rw12(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p);
u32 lba, txlen;
lba = get_unaligned_be32(&cdb[2]);
txlen = get_unaligned_be32(&cdb[6]);
trace_seq_printf(p, "lba=%u txlen=%u protect=%u", lba, txlen,
cdb[1] >> 5);
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_rw16(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p);
u64 lba;
u32 txlen;
lba = get_unaligned_be64(&cdb[2]);
txlen = get_unaligned_be32(&cdb[10]);
trace_seq_printf(p, "lba=%llu txlen=%u protect=%u", lba, txlen,
cdb[1] >> 5);
if (cdb[0] == WRITE_SAME_16)
trace_seq_printf(p, " unmap=%u", cdb[1] >> 3 & 1);
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_rw32(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p), *cmd;
u64 lba;
u32 ei_lbrt, txlen;
switch (SERVICE_ACTION32(cdb)) {
case READ_32:
cmd = "READ";
break;
case VERIFY_32:
cmd = "VERIFY";
break;
case WRITE_32:
cmd = "WRITE";
break;
case WRITE_SAME_32:
cmd = "WRITE_SAME";
break;
default:
trace_seq_puts(p, "UNKNOWN");
goto out;
}
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);
out:
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_unmap(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p);
unsigned int regions = get_unaligned_be16(&cdb[7]);
trace_seq_printf(p, "regions=%u", (regions - 8) / 16);
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_service_action_in(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p), *cmd;
u64 lba;
u32 alloc_len;
switch (SERVICE_ACTION16(cdb)) {
case SAI_READ_CAPACITY_16:
cmd = "READ_CAPACITY_16";
break;
case SAI_GET_LBA_STATUS:
cmd = "GET_LBA_STATUS";
break;
default:
trace_seq_puts(p, "UNKNOWN");
goto out;
}
lba = get_unaligned_be64(&cdb[2]);
alloc_len = get_unaligned_be32(&cdb[10]);
trace_seq_printf(p, "%s lba=%llu alloc_len=%u", cmd, lba, alloc_len);
out:
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_maintenance_in(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p), *cmd;
u32 alloc_len;
switch (SERVICE_ACTION16(cdb)) {
case MI_REPORT_IDENTIFYING_INFORMATION:
cmd = "REPORT_IDENTIFYING_INFORMATION";
break;
case MI_REPORT_TARGET_PGS:
cmd = "REPORT_TARGET_PORT_GROUPS";
break;
case MI_REPORT_ALIASES:
cmd = "REPORT_ALIASES";
break;
case MI_REPORT_SUPPORTED_OPERATION_CODES:
cmd = "REPORT_SUPPORTED_OPERATION_CODES";
break;
case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
cmd = "REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS";
break;
case MI_REPORT_PRIORITY:
cmd = "REPORT_PRIORITY";
break;
case MI_REPORT_TIMESTAMP:
cmd = "REPORT_TIMESTAMP";
break;
case MI_MANAGEMENT_PROTOCOL_IN:
cmd = "MANAGEMENT_PROTOCOL_IN";
break;
default:
trace_seq_puts(p, "UNKNOWN");
goto out;
}
alloc_len = get_unaligned_be32(&cdb[6]);
trace_seq_printf(p, "%s alloc_len=%u", cmd, alloc_len);
out:
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_maintenance_out(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p), *cmd;
u32 alloc_len;
switch (SERVICE_ACTION16(cdb)) {
case MO_SET_IDENTIFYING_INFORMATION:
cmd = "SET_IDENTIFYING_INFORMATION";
break;
case MO_SET_TARGET_PGS:
cmd = "SET_TARGET_PORT_GROUPS";
break;
case MO_CHANGE_ALIASES:
cmd = "CHANGE_ALIASES";
break;
case MO_SET_PRIORITY:
cmd = "SET_PRIORITY";
break;
case MO_SET_TIMESTAMP:
cmd = "SET_TIMESTAMP";
break;
case MO_MANAGEMENT_PROTOCOL_OUT:
cmd = "MANAGEMENT_PROTOCOL_OUT";
break;
default:
trace_seq_puts(p, "UNKNOWN");
goto out;
}
alloc_len = get_unaligned_be32(&cdb[6]);
trace_seq_printf(p, "%s alloc_len=%u", cmd, alloc_len);
out:
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_zbc_in(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p), *cmd;
u64 zone_id;
u32 alloc_len;
u8 options;
switch (SERVICE_ACTION16(cdb)) {
case ZI_REPORT_ZONES:
cmd = "REPORT_ZONES";
break;
default:
trace_seq_puts(p, "UNKNOWN");
goto out;
}
zone_id = get_unaligned_be64(&cdb[2]);
alloc_len = get_unaligned_be32(&cdb[10]);
options = cdb[14] & 0x3f;
trace_seq_printf(p, "%s zone=%llu alloc_len=%u options=%u partial=%u",
cmd, (unsigned long long)zone_id, alloc_len,
options, (cdb[14] >> 7) & 1);
out:
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_zbc_out(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p), *cmd;
u64 zone_id;
switch (SERVICE_ACTION16(cdb)) {
case ZO_CLOSE_ZONE:
cmd = "CLOSE_ZONE";
break;
case ZO_FINISH_ZONE:
cmd = "FINISH_ZONE";
break;
case ZO_OPEN_ZONE:
cmd = "OPEN_ZONE";
break;
case ZO_RESET_WRITE_POINTER:
cmd = "RESET_WRITE_POINTER";
break;
default:
trace_seq_puts(p, "UNKNOWN");
goto out;
}
zone_id = get_unaligned_be64(&cdb[2]);
trace_seq_printf(p, "%s zone=%llu all=%u", cmd,
(unsigned long long)zone_id, cdb[14] & 1);
out:
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_varlen(struct trace_seq *p, unsigned char *cdb, int len)
{
switch (SERVICE_ACTION32(cdb)) {
case READ_32:
case VERIFY_32:
case WRITE_32:
case WRITE_SAME_32:
return scsi_trace_rw32(p, cdb, len);
default:
return scsi_trace_misc(p, cdb, len);
}
}
static const char *
scsi_trace_misc(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = trace_seq_buffer_ptr(p);
trace_seq_putc(p, '-');
trace_seq_putc(p, 0);
return ret;
}
const char *
scsi_trace_parse_cdb(struct trace_seq *p, unsigned char *cdb, int len)
{
switch (cdb[0]) {
case READ_6:
case WRITE_6:
return scsi_trace_rw6(p, cdb, len);
case READ_10:
case VERIFY:
case WRITE_10:
case WRITE_SAME:
return scsi_trace_rw10(p, cdb, len);
case READ_12:
case VERIFY_12:
case WRITE_12:
return scsi_trace_rw12(p, cdb, len);
case READ_16:
case VERIFY_16:
case WRITE_16:
case WRITE_SAME_16:
return scsi_trace_rw16(p, cdb, len);
case UNMAP:
return scsi_trace_unmap(p, cdb, len);
case SERVICE_ACTION_IN_16:
return scsi_trace_service_action_in(p, cdb, len);
case VARIABLE_LENGTH_CMD:
return scsi_trace_varlen(p, cdb, len);
case MAINTENANCE_IN:
return scsi_trace_maintenance_in(p, cdb, len);
case MAINTENANCE_OUT:
return scsi_trace_maintenance_out(p, cdb, len);
case ZBC_IN:
return scsi_trace_zbc_in(p, cdb, len);
case ZBC_OUT:
return scsi_trace_zbc_out(p, cdb, len);
default:
return scsi_trace_misc(p, cdb, len);
}
}
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