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Bottomley" , "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Justin Stitt Content-Type: text/plain; charset="utf-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable 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 =3D 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] =3D "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 let's use strscpy_pad as cap is allocated via dma_alloc_coherent(): | cap =3D dma_alloc_coherent(&vscsi->dma_dev->dev, olen, &token, | GFP_ATOMIC); Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncp= y-on-nul-terminated-strings [1] Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.htm= l [2] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt --- Note: build-tested only. Found with: $ rg "strncpy\(" --- drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c b/drivers/scsi/ibmvsc= si_tgt/ibmvscsi_tgt.c index 385f812b8793..cd223ef696e5 100644 --- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c +++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c @@ -1551,17 +1551,17 @@ static long ibmvscsis_adapter_info(struct scsi_info= *vscsi, if (vscsi->client_data.partition_number =3D=3D 0) vscsi->client_data.partition_number =3D 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 =3D be32_to_cpu(info->mad_version); vscsi->client_data.os_type =3D be32_to_cpu(info->os_type); =20 /* Copy our info */ - strncpy(info->srp_version, SRP_VERSION, + strscpy(info->srp_version, SRP_VERSION, sizeof(info->srp_version)); - strncpy(info->partition_name, vscsi->dds.partition_name, + strscpy(info->partition_name, vscsi->dds.partition_name, sizeof(info->partition_name)); info->partition_number =3D cpu_to_be32(vscsi->dds.partition_num); info->mad_version =3D cpu_to_be32(MAD_VERSION_1); @@ -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 =3D=3D 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)); =20 len =3D olen - min_len; status =3D VIOSRP_MAD_SUCCESS; @@ -3650,7 +3650,7 @@ static int ibmvscsis_get_system_info(void) =20 name =3D of_get_property(rootdn, "ibm,partition-name", NULL); if (name) - strncpy(partition_name, name, sizeof(partition_name)); + strscpy(partition_name, name, sizeof(partition_name)); =20 num =3D of_get_property(rootdn, "ibm,partition-no", NULL); if (num) --- base-commit: ffc253263a1375a65fa6c9f62a893e9767fbebfa change-id: 20231030-strncpy-drivers-scsi-ibmvscsi_tgt-ibmvscsi_tgt-c-8a9bd0= e54666 Best regards, -- Justin Stitt