diff options
author | Justin Stitt <justinstitt@google.com> | 2023-12-12 01:20:20 +0000 |
---|---|---|
committer | Martin K. Petersen <martin.petersen@oracle.com> | 2024-01-23 21:41:28 -0500 |
commit | 165470fb260020861bea61a18f3e3a543a20c804 (patch) | |
tree | 6938b87725632b5d744b950d39da5993dc2b8101 /drivers/scsi | |
parent | be7fc734b658497aa8fe937c8109e0121c1881af (diff) | |
download | linux-165470fb260020861bea61a18f3e3a543a20c804.tar.gz |
scsi: ibmvscsi_tgt: Replace deprecated strncpy() with strscpy()
strncpy() is deprecated for use on NUL-terminated destination strings [1]
and as such we should prefer more robust and less ambiguous string
interfaces.
We don't need the NUL-padding behavior that strncpy() provides as vscsi is
NUL-allocated in ibmvscsis_probe() which proceeds to call
ibmvscsis_adapter_info():
| vscsi = kzalloc(sizeof(*vscsi), GFP_KERNEL);
ibmvscsis_probe() -> ibmvscsis_handle_crq() -> ibmvscsis_parse_command()
-> ibmvscsis_mad() -> ibmvscsis_process_mad() -> ibmvscsis_adapter_info()
Following the same idea, `partition_name` is defiend as:
| static char partition_name[PARTITION_NAMELEN] = "UNKNOWN";
... which is NUL-padded already, meaning strscpy() is the best option.
Considering the above, a suitable replacement is strscpy() [2] due to the
fact that it guarantees NUL-termination on the destination buffer without
unnecessarily NUL-padding.
However, for cap->name and info let's use strscpy_pad() as they are
allocated via dma_alloc_coherent():
| cap = dma_alloc_coherent(&vscsi->dma_dev->dev, olen, &token,
| GFP_ATOMIC);
&
| info = dma_alloc_coherent(&vscsi->dma_dev->dev, sizeof(*info), &token,
| GFP_ATOMIC);
Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt@google.com>
Link: https://lore.kernel.org/r/20231212-strncpy-drivers-scsi-ibmvscsi_tgt-ibmvscsi_tgt-c-v2-1-bdb9a7cd96c8@google.com
Acked-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r-- | drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c index 4dc411a581070..6b16020b1f598 100644 --- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c +++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c @@ -1551,18 +1551,18 @@ static long ibmvscsis_adapter_info(struct scsi_info *vscsi, if (vscsi->client_data.partition_number == 0) vscsi->client_data.partition_number = be32_to_cpu(info->partition_number); - strncpy(vscsi->client_data.srp_version, info->srp_version, + strscpy(vscsi->client_data.srp_version, info->srp_version, sizeof(vscsi->client_data.srp_version)); - strncpy(vscsi->client_data.partition_name, info->partition_name, + strscpy(vscsi->client_data.partition_name, info->partition_name, sizeof(vscsi->client_data.partition_name)); vscsi->client_data.mad_version = be32_to_cpu(info->mad_version); vscsi->client_data.os_type = be32_to_cpu(info->os_type); /* Copy our info */ - strncpy(info->srp_version, SRP_VERSION, - sizeof(info->srp_version)); - strncpy(info->partition_name, vscsi->dds.partition_name, - sizeof(info->partition_name)); + strscpy_pad(info->srp_version, SRP_VERSION, + sizeof(info->srp_version)); + strscpy_pad(info->partition_name, vscsi->dds.partition_name, + sizeof(info->partition_name)); info->partition_number = cpu_to_be32(vscsi->dds.partition_num); info->mad_version = cpu_to_be32(MAD_VERSION_1); info->os_type = cpu_to_be32(LINUX); @@ -1645,8 +1645,8 @@ static int ibmvscsis_cap_mad(struct scsi_info *vscsi, struct iu_entry *iue) be64_to_cpu(mad->buffer), vscsi->dds.window[LOCAL].liobn, token); if (rc == H_SUCCESS) { - strncpy(cap->name, dev_name(&vscsi->dma_dev->dev), - SRP_MAX_LOC_LEN); + strscpy_pad(cap->name, dev_name(&vscsi->dma_dev->dev), + sizeof(cap->name)); len = olen - min_len; status = VIOSRP_MAD_SUCCESS; @@ -3650,7 +3650,7 @@ static int ibmvscsis_get_system_info(void) name = of_get_property(rootdn, "ibm,partition-name", NULL); if (name) - strncpy(partition_name, name, sizeof(partition_name)); + strscpy(partition_name, name, sizeof(partition_name)); num = of_get_property(rootdn, "ibm,partition-no", NULL); if (num) |