Commit f5a8b3a7 authored by Sagi Grimberg's avatar Sagi Grimberg Committed by Nicholas Bellinger

scsi: Protect against buffer possible overflow in scsi_set_sense_information

Make sure that the input sense buffer has sufficient length
to fit the information descriptor (12 additional bytes).
Modify scsi_set_sense_information to receive the sense buffer
length and adjust its callers scsi target and libata.

(Fix patch fuzz in scsi_set_sense_information - nab)
Reported-by: default avatarHannes Reinecke <hare@suse.de>
Signed-off-by: default avatarSagi Grimberg <sagig@mellanox.com>
Reviewed-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Cc: Tejun Heo <tj@kernel.org>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent 12306b42
......@@ -289,7 +289,9 @@ void ata_scsi_set_sense_information(struct scsi_cmnd *cmd,
return;
information = ata_tf_read_block(tf, NULL);
scsi_set_sense_information(cmd->sense_buffer, information);
scsi_set_sense_information(cmd->sense_buffer,
SCSI_SENSE_BUFFERSIZE,
information);
}
static ssize_t
......
......@@ -5,6 +5,7 @@
#include <linux/bug.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <asm/unaligned.h>
#include <scsi/scsi_common.h>
......@@ -249,10 +250,13 @@ EXPORT_SYMBOL(scsi_build_sense_buffer);
* scsi_set_sense_information - set the information field in a
* formatted sense data buffer
* @buf: Where to build sense data
* @buf_len: buffer length
* @info: 64-bit information value to be set
*
* Return value:
* 0 on success or EINVAL for invalid sense buffer length
**/
void scsi_set_sense_information(u8 *buf, u64 info)
int scsi_set_sense_information(u8 *buf, int buf_len, u64 info)
{
if ((buf[0] & 0x7f) == 0x72) {
u8 *ucp, len;
......@@ -263,6 +267,11 @@ void scsi_set_sense_information(u8 *buf, u64 info)
buf[7] = len + 0xc;
ucp = buf + 8 + len;
}
if (buf_len < len + 0xc)
/* Not enough room for info */
return -EINVAL;
ucp[0] = 0;
ucp[1] = 0xa;
ucp[2] = 0x80; /* Valid bit */
......@@ -272,5 +281,7 @@ void scsi_set_sense_information(u8 *buf, u64 info)
buf[0] |= 0x80;
put_unaligned_be64(info, &buf[3]);
}
return 0;
}
EXPORT_SYMBOL(scsi_set_sense_information);
......@@ -2729,7 +2729,7 @@ static const struct sense_info sense_info_table[] = {
},
};
static void translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
{
const struct sense_info *si;
u8 *buffer = cmd->sense_buffer;
......@@ -2756,7 +2756,11 @@ static void translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
scsi_build_sense_buffer(0, buffer, si->key, asc, ascq);
if (si->add_sector_info)
scsi_set_sense_information(buffer, cmd->bad_sector);
return scsi_set_sense_information(buffer,
cmd->scsi_sense_length,
cmd->bad_sector);
return 0;
}
int
......@@ -2774,10 +2778,14 @@ transport_send_check_condition_and_sense(struct se_cmd *cmd,
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
if (!from_transport) {
int rc;
cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
translate_sense_reason(cmd, reason);
cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
rc = translate_sense_reason(cmd, reason);
if (rc)
return rc;
}
trace_target_cmd_complete(cmd);
......
......@@ -62,7 +62,7 @@ extern bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
struct scsi_sense_hdr *sshdr);
extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);
extern void scsi_set_sense_information(u8 *buf, u64 info);
int scsi_set_sense_information(u8 *buf, int buf_len, u64 info);
extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
int desc_type);
......
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