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scsi: target: consistently null-terminate t10_wwn strings 

In preparation for supporting user provided vendor strings, add an extra
byte to the vendor, model and revision arrays in struct t10_wwn. This
ensures that the full INQUIRY data can be carried in the arrays along with
a null-terminator.

Change a number of array readers and writers so that they account for
explicit null-termination:

- The pscsi_set_inquiry_info() and emulate_model_alias_store() codepaths
  don't currently explicitly null-terminate; fix this.

- Existing t10_wwn field dumps use for-loops which step over
  null-terminators for right-padding.
  + Use printf with width specifiers instead.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
David Disseldorp 2018-12-05 13:18:35 +01:00 committed by Martin K. Petersen
parent 0de263577d
commit b2da4abf26
6 changed files with 62 additions and 101 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/target/target_core_configfs.c
View File

@ -620,12 +620,17 @@ static void dev_set_t10_wwn_model_alias(struct se_device *dev)
const char *configname;
configname = config_item_name(&dev->dev_group.cg_item);
if (strlen(configname) >= 16) {
if (strlen(configname) >= INQUIRY_MODEL_LEN) {
pr_warn("dev[%p]: Backstore name '%s' is too long for "
"INQUIRY_MODEL, truncating to 16 bytes\n", dev,
"INQUIRY_MODEL, truncating to 15 characters\n", dev,
configname);
}
snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
/*
* XXX We can't use sizeof(dev->t10_wwn.model) (INQUIRY_MODEL_LEN + 1)
* here without potentially breaking existing setups, so continue to
* truncate one byte shorter than what can be carried in INQUIRY.
*/
strlcpy(dev->t10_wwn.model, configname, INQUIRY_MODEL_LEN);
}
static ssize_t emulate_model_alias_store(struct config_item *item,
@ -647,11 +652,12 @@ static ssize_t emulate_model_alias_store(struct config_item *item,
if (ret < 0)
return ret;
BUILD_BUG_ON(sizeof(dev->t10_wwn.model) != INQUIRY_MODEL_LEN + 1);
if (flag) {
dev_set_t10_wwn_model_alias(dev);
} else {
strncpy(&dev->t10_wwn.model[0],
dev->transport->inquiry_prod, 16);
strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
sizeof(dev->t10_wwn.model));
}
da->emulate_model_alias = flag;
return count;

46
drivers/target/target_core_device.c
View File

@ -720,36 +720,17 @@ void core_dev_free_initiator_node_lun_acl(
static void scsi_dump_inquiry(struct se_device *dev)
{
struct t10_wwn *wwn = &dev->t10_wwn;
char buf[17];
int i, device_type;
int device_type = dev->transport->get_device_type(dev);
/*
* Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
*/
for (i = 0; i < 8; i++)
if (wwn->vendor[i] >= 0x20)
buf[i] = wwn->vendor[i];
else
buf[i] = ' ';
buf[i] = '\0';
pr_debug(" Vendor: %s\n", buf);
for (i = 0; i < 16; i++)
if (wwn->model[i] >= 0x20)
buf[i] = wwn->model[i];
else
buf[i] = ' ';
buf[i] = '\0';
pr_debug(" Model: %s\n", buf);
for (i = 0; i < 4; i++)
if (wwn->revision[i] >= 0x20)
buf[i] = wwn->revision[i];
else
buf[i] = ' ';
buf[i] = '\0';
pr_debug(" Revision: %s\n", buf);
device_type = dev->transport->get_device_type(dev);
pr_debug(" Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n",
wwn->vendor);
pr_debug(" Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n",
wwn->model);
pr_debug(" Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n",
wwn->revision);
pr_debug(" Type: %s ", scsi_device_type(device_type));
}
@ -997,11 +978,12 @@ int target_configure_device(struct se_device *dev)
* passthrough because this is being provided by the backend LLD.
*/
if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
strncpy(&dev->t10_wwn.model[0],
dev->transport->inquiry_prod, 16);
strncpy(&dev->t10_wwn.revision[0],
dev->transport->inquiry_rev, 4);
strlcpy(dev->t10_wwn.vendor, "LIO-ORG",
sizeof(dev->t10_wwn.vendor));
strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
sizeof(dev->t10_wwn.model));
strlcpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
sizeof(dev->t10_wwn.revision));
}
scsi_dump_inquiry(dev);

50
drivers/target/target_core_pscsi.c
View File

@ -179,20 +179,20 @@ out_free:
static void
pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
{
unsigned char *buf;
if (sdev->inquiry_len < INQUIRY_LEN)
return;
buf = sdev->inquiry;
if (!buf)
return;
/*
* Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
* Use sdev->inquiry data from drivers/scsi/scsi_scan.c:scsi_add_lun()
*/
memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
BUILD_BUG_ON(sizeof(wwn->vendor) != INQUIRY_VENDOR_LEN + 1);
snprintf(wwn->vendor, sizeof(wwn->vendor),
"%." __stringify(INQUIRY_VENDOR_LEN) "s", sdev->vendor);
BUILD_BUG_ON(sizeof(wwn->model) != INQUIRY_MODEL_LEN + 1);
snprintf(wwn->model, sizeof(wwn->model),
"%." __stringify(INQUIRY_MODEL_LEN) "s", sdev->model);
BUILD_BUG_ON(sizeof(wwn->revision) != INQUIRY_REVISION_LEN + 1);
snprintf(wwn->revision, sizeof(wwn->revision),
"%." __stringify(INQUIRY_REVISION_LEN) "s", sdev->rev);
}
static int
@ -811,7 +811,6 @@ static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b)
struct scsi_device *sd = pdv->pdv_sd;
unsigned char host_id[16];
ssize_t bl;
int i;
if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
snprintf(host_id, 16, "%d", pdv->pdv_host_id);
@ -824,29 +823,12 @@ static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b)
host_id);
if (sd) {
bl += sprintf(b + bl, " ");
bl += sprintf(b + bl, "Vendor: ");
for (i = 0; i < 8; i++) {
if (ISPRINT(sd->vendor[i])) /* printable character? */
bl += sprintf(b + bl, "%c", sd->vendor[i]);
else
bl += sprintf(b + bl, " ");
}
bl += sprintf(b + bl, " Model: ");
for (i = 0; i < 16; i++) {
if (ISPRINT(sd->model[i])) /* printable character ? */
bl += sprintf(b + bl, "%c", sd->model[i]);
else
bl += sprintf(b + bl, " ");
}
bl += sprintf(b + bl, " Rev: ");
for (i = 0; i < 4; i++) {
if (ISPRINT(sd->rev[i])) /* printable character ? */
bl += sprintf(b + bl, "%c", sd->rev[i]);
else
bl += sprintf(b + bl, " ");
}
bl += sprintf(b + bl, "\n");
bl += sprintf(b + bl, " Vendor: %."
__stringify(INQUIRY_VENDOR_LEN) "s", sd->vendor);
bl += sprintf(b + bl, " Model: %."
__stringify(INQUIRY_MODEL_LEN) "s", sd->model);
bl += sprintf(b + bl, " Rev: %."
__stringify(INQUIRY_REVISION_LEN) "s\n", sd->rev);
}
return bl;
}

7
drivers/target/target_core_spc.c
View File

@ -113,12 +113,13 @@ spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
* unused bytes at the end of the field (i.e., highest offset) and the
* unused bytes shall be filled with ASCII space characters (20h).
*/
memset(&buf[8], 0x20, 8 + 16 + 4);
memset(&buf[8], 0x20,
INQUIRY_VENDOR_LEN + INQUIRY_MODEL_LEN + INQUIRY_REVISION_LEN);
memcpy(&buf[8], "LIO-ORG", sizeof("LIO-ORG") - 1);
memcpy(&buf[16], dev->t10_wwn.model,
strnlen(dev->t10_wwn.model, 16));
strnlen(dev->t10_wwn.model, INQUIRY_MODEL_LEN));
memcpy(&buf[32], dev->t10_wwn.revision,
strnlen(dev->t10_wwn.revision, 4));
strnlen(dev->t10_wwn.revision, INQUIRY_REVISION_LEN));
buf[4] = 31; /* Set additional length to 31 */
return 0;

30
drivers/target/target_core_stat.c
View File

@ -246,43 +246,25 @@ static ssize_t target_stat_lu_lu_name_show(struct config_item *item, char *page)
static ssize_t target_stat_lu_vend_show(struct config_item *item, char *page)
{
struct se_device *dev = to_stat_lu_dev(item);
int i;
char str[sizeof(dev->t10_wwn.vendor)+1];
/* scsiLuVendorId */
for (i = 0; i < sizeof(dev->t10_wwn.vendor); i++)
str[i] = ISPRINT(dev->t10_wwn.vendor[i]) ?
dev->t10_wwn.vendor[i] : ' ';
str[i] = '\0';
return snprintf(page, PAGE_SIZE, "%s\n", str);
return snprintf(page, PAGE_SIZE, "%-" __stringify(INQUIRY_VENDOR_LEN)
"s\n", dev->t10_wwn.vendor);
}
static ssize_t target_stat_lu_prod_show(struct config_item *item, char *page)
{
struct se_device *dev = to_stat_lu_dev(item);
int i;
char str[sizeof(dev->t10_wwn.model)+1];
/* scsiLuProductId */
for (i = 0; i < sizeof(dev->t10_wwn.model); i++)
str[i] = ISPRINT(dev->t10_wwn.model[i]) ?
dev->t10_wwn.model[i] : ' ';
str[i] = '\0';
return snprintf(page, PAGE_SIZE, "%s\n", str);
return snprintf(page, PAGE_SIZE, "%-" __stringify(INQUIRY_MODEL_LEN)
"s\n", dev->t10_wwn.model);
}
static ssize_t target_stat_lu_rev_show(struct config_item *item, char *page)
{
struct se_device *dev = to_stat_lu_dev(item);
int i;
char str[sizeof(dev->t10_wwn.revision)+1];
/* scsiLuRevisionId */
for (i = 0; i < sizeof(dev->t10_wwn.revision); i++)
str[i] = ISPRINT(dev->t10_wwn.revision[i]) ?
dev->t10_wwn.revision[i] : ' ';
str[i] = '\0';
return snprintf(page, PAGE_SIZE, "%s\n", str);
return snprintf(page, PAGE_SIZE, "%-" __stringify(INQUIRY_REVISION_LEN)
"s\n", dev->t10_wwn.revision);
}
static ssize_t target_stat_lu_dev_type_show(struct config_item *item, char *page)

14
include/target/target_core_base.h
View File

@ -46,6 +46,10 @@
/* Used by transport_get_inquiry_vpd_device_ident() */
#define INQUIRY_VPD_DEVICE_IDENTIFIER_LEN 254
#define INQUIRY_VENDOR_LEN 8
#define INQUIRY_MODEL_LEN 16
#define INQUIRY_REVISION_LEN 4
/* Attempts before moving from SHORT to LONG */
#define PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD 3
#define PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT 3 /* In milliseconds */
@ -315,9 +319,13 @@ struct t10_vpd {
};
struct t10_wwn {
char vendor[8];
char model[16];
char revision[4];
/*
* SCSI left aligned strings may not be null terminated. +1 to ensure a
* null terminator is always present.
*/
char vendor[INQUIRY_VENDOR_LEN + 1];
char model[INQUIRY_MODEL_LEN + 1];
char revision[INQUIRY_REVISION_LEN + 1];
char unit_serial[INQUIRY_VPD_SERIAL_LEN];
spinlock_t t10_vpd_lock;
struct se_device *t10_dev;