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authorNicholas Bellinger <nab@linux-iscsi.org>2015-02-14 01:49:38 +0300
committerNicholas Bellinger <nab@linux-iscsi.org>2015-02-14 05:09:44 +0300
commitf7b7c06f386c5e990acb87a8bc96137b9f978977 (patch)
tree60a15481f0e470257ec72de21a8dd53b81427b93 /drivers/target
parentaa179935edea9a64dec4b757090c8106a3907ffa (diff)
downloadlinux-f7b7c06f386c5e990acb87a8bc96137b9f978977.tar.xz
target: Fail I/O with PROTECT bit when protection is unsupported
This patch adds an explicit check for WRPROTECT + RDPROTECT bit usage within sbc_check_prot(), and fails with TCM_INVALID_CDB_FIELD if the backend device does not have protection enabled. Also, update sbc_check_prot() to return sense_reason_t in order to propigate up the correct sense ASQ. Cc: Martin Petersen <martin.petersen@oracle.com> Cc: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_sbc.c51
1 files changed, 32 insertions, 19 deletions
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 17259c05450e..1bb8b4a93a66 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -626,14 +626,21 @@ sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type,
return 0;
}
-static bool
+static sense_reason_t
sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
u32 sectors, bool is_write)
{
u8 protect = cdb[1] >> 5;
- if ((!cmd->t_prot_sg || !cmd->t_prot_nents) && cmd->prot_pto)
- return true;
+ if (!cmd->t_prot_sg || !cmd->t_prot_nents) {
+ if (protect && !dev->dev_attrib.pi_prot_type) {
+ pr_err("CDB contains protect bit, but device does not"
+ " advertise PROTECT=1 feature bit\n");
+ return TCM_INVALID_CDB_FIELD;
+ }
+ if (cmd->prot_pto)
+ return TCM_NO_SENSE;
+ }
switch (dev->dev_attrib.pi_prot_type) {
case TARGET_DIF_TYPE3_PROT:
@@ -641,7 +648,7 @@ sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
break;
case TARGET_DIF_TYPE2_PROT:
if (protect)
- return false;
+ return TCM_INVALID_CDB_FIELD;
cmd->reftag_seed = cmd->t_task_lba;
break;
@@ -650,12 +657,12 @@ sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
break;
case TARGET_DIF_TYPE0_PROT:
default:
- return true;
+ return TCM_NO_SENSE;
}
if (sbc_set_prot_op_checks(protect, dev->dev_attrib.pi_prot_type,
is_write, cmd))
- return false;
+ return TCM_INVALID_CDB_FIELD;
cmd->prot_type = dev->dev_attrib.pi_prot_type;
cmd->prot_length = dev->prot_length * sectors;
@@ -674,7 +681,7 @@ sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
__func__, cmd->prot_type, cmd->data_length, cmd->prot_length,
cmd->prot_op, cmd->prot_checks);
- return true;
+ return TCM_NO_SENSE;
}
sense_reason_t
@@ -698,8 +705,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
sectors = transport_get_sectors_10(cdb);
cmd->t_task_lba = transport_lba_32(cdb);
- if (!sbc_check_prot(dev, cmd, cdb, sectors, false))
- return TCM_UNSUPPORTED_SCSI_OPCODE;
+ ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
+ if (ret)
+ return ret;
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
cmd->execute_rw = ops->execute_rw;
@@ -709,8 +717,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
sectors = transport_get_sectors_12(cdb);
cmd->t_task_lba = transport_lba_32(cdb);
- if (!sbc_check_prot(dev, cmd, cdb, sectors, false))
- return TCM_UNSUPPORTED_SCSI_OPCODE;
+ ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
+ if (ret)
+ return ret;
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
cmd->execute_rw = ops->execute_rw;
@@ -720,8 +729,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
sectors = transport_get_sectors_16(cdb);
cmd->t_task_lba = transport_lba_64(cdb);
- if (!sbc_check_prot(dev, cmd, cdb, sectors, false))
- return TCM_UNSUPPORTED_SCSI_OPCODE;
+ ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
+ if (ret)
+ return ret;
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
cmd->execute_rw = ops->execute_rw;
@@ -739,8 +749,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
sectors = transport_get_sectors_10(cdb);
cmd->t_task_lba = transport_lba_32(cdb);
- if (!sbc_check_prot(dev, cmd, cdb, sectors, true))
- return TCM_UNSUPPORTED_SCSI_OPCODE;
+ ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
+ if (ret)
+ return ret;
if (cdb[1] & 0x8)
cmd->se_cmd_flags |= SCF_FUA;
@@ -752,8 +763,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
sectors = transport_get_sectors_12(cdb);
cmd->t_task_lba = transport_lba_32(cdb);
- if (!sbc_check_prot(dev, cmd, cdb, sectors, true))
- return TCM_UNSUPPORTED_SCSI_OPCODE;
+ ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
+ if (ret)
+ return ret;
if (cdb[1] & 0x8)
cmd->se_cmd_flags |= SCF_FUA;
@@ -765,8 +777,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
sectors = transport_get_sectors_16(cdb);
cmd->t_task_lba = transport_lba_64(cdb);
- if (!sbc_check_prot(dev, cmd, cdb, sectors, true))
- return TCM_UNSUPPORTED_SCSI_OPCODE;
+ ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
+ if (ret)
+ return ret;
if (cdb[1] & 0x8)
cmd->se_cmd_flags |= SCF_FUA;