[PATCH AUTOSEL 5.10 47/47] scsi: target: core: Prevent underflow for service actions

Sasha Levin
2021-03-02T13:24:56Z

From: Aleksandr Miloserdov <a.miloserdov@yadro.com>

[ Upstream commit 14d24e2cc77411301e906a8cf41884739de192de ]

TCM buffer length doesn't necessarily equal 8 + ADDITIONAL LENGTH which
might be considered an underflow in case of Data-In size being greater than
8 + ADDITIONAL LENGTH. So truncate buffer length to prevent underflow.

Link: https://lore.kernel.org/r/20210209072202.41154-3-a.miloserdov@yadro.com
Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
Reviewed-by: Bodo Stroesser <bostroesser@gmail.com>
Signed-off-by: Aleksandr Miloserdov <a.miloserdov@yadro.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/target/target_core_pr.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index 5f79ea05f9b8..b42193c554fb 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -3738,6 +3738,7 @@ core_scsi3_pri_read_keys(struct se_cmd *cmd)
spin_unlock(&dev->t10_pr.registration_lock);

put_unaligned_be32(add_len, &buf[4]);
+ target_set_cmd_data_length(cmd, 8 + add_len);

transport_kunmap_data_sg(cmd);

@@ -3756,7 +3757,7 @@ core_scsi3_pri_read_reservation(struct se_cmd *cmd)
struct t10_pr_registration *pr_reg;
unsigned char *buf;
u64 pr_res_key;
- u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
+ u32 add_len = 0;

if (cmd->data_length < 8) {
pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
@@ -3774,8 +3775,9 @@ core_scsi3_pri_read_reservation(struct se_cmd *cmd)
pr_reg = dev->dev_pr_res_holder;
if (pr_reg) {
/*
- * Set the hardcoded Additional Length
+ * Set the Additional Length to 16 when a reservation is held
*/
+ add_len = 16;
put_unaligned_be32(add_len, &buf[4]);

if (cmd->data_length < 22)
@@ -3811,6 +3813,8 @@ core_scsi3_pri_read_reservation(struct se_cmd *cmd)
(pr_reg->pr_res_type & 0x0f);
}

+ target_set_cmd_data_length(cmd, 8 + add_len);
+
err:
spin_unlock(&dev->dev_reservation_lock);
transport_kunmap_data_sg(cmd);
@@ -3829,7 +3833,7 @@ core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
struct se_device *dev = cmd->se_dev;
struct t10_reservation *pr_tmpl = &dev->t10_pr;
unsigned char *buf;
- u16 add_len = 8; /* Hardcoded to 8. */
+ u16 len = 8; /* Hardcoded to 8. */

if (cmd->data_length < 6) {
pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
@@ -3841,7 +3845,7 @@ core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
if (!buf)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;

- put_unaligned_be16(add_len, &buf[0]);
+ put_unaligned_be16(len, &buf[0]);
buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
@@ -3870,6 +3874,8 @@ core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */

+ target_set_cmd_data_length(cmd, len);
+
transport_kunmap_data_sg(cmd);

return 0;
@@ -4030,6 +4036,7 @@ core_scsi3_pri_read_full_status(struct se_cmd *cmd)
* Set ADDITIONAL_LENGTH
*/
put_unaligned_be32(add_len, &buf[4]);
+ target_set_cmd_data_length(cmd, 8 + add_len);

transport_kunmap_data_sg(cmd);

--
2.30.1