Re: [PATCH] scsi: ibmvscsi: replace deprecated strncpy with strscpy
On Mon, 30 Oct 2023 20:40:48 +, Justin Stitt wrote: > 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 expect partition_name to be NUL-terminated based on its usage with > format strings: > | dev_info(hostdata->dev, "host srp version: %s, " > |"host partition %s (%d), OS %d, max io %u\n", > |hostdata->madapter_info.srp_version, > |hostdata->madapter_info.partition_name, > |be32_to_cpu(hostdata->madapter_info.partition_number), > |be32_to_cpu(hostdata->madapter_info.os_type), > |be32_to_cpu(hostdata->madapter_info.port_max_txu[0])); > ... > | len = snprintf(buf, PAGE_SIZE, "%s\n", > |hostdata->madapter_info.partition_name); > > [...] Applied to 6.8/scsi-queue, thanks! [1/1] scsi: ibmvscsi: replace deprecated strncpy with strscpy https://git.kernel.org/mkp/scsi/c/712b3f43ba0e -- Martin K. Petersen Oracle Linux Engineering
Re: [PATCH] scsi: ibmvscsi: replace deprecated strncpy with strscpy
Michael, >> strncpy() is deprecated for use on NUL-terminated destination strings >> [1] and as such we should prefer more robust and less ambiguous string >> interfaces. > I gave it a quick boot, no issues. > > Tested-by: Michael Ellerman (powerpc) Applied to 6.8/scsi-staging, thanks! -- Martin K. Petersen Oracle Linux Engineering
Re: [PATCH] scsi: ibmvscsi: replace deprecated strncpy with strscpy
Justin Stitt writes: > 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 expect partition_name to be NUL-terminated based on its usage with > format strings: > | dev_info(hostdata->dev, "host srp version: %s, " > |"host partition %s (%d), OS %d, max io %u\n", > |hostdata->madapter_info.srp_version, > |hostdata->madapter_info.partition_name, > |be32_to_cpu(hostdata->madapter_info.partition_number), > |be32_to_cpu(hostdata->madapter_info.os_type), > |be32_to_cpu(hostdata->madapter_info.port_max_txu[0])); > ... > | len = snprintf(buf, PAGE_SIZE, "%s\n", > |hostdata->madapter_info.partition_name); > > Moreover, NUL-padding is not required as madapter_info is explicitly > memset to 0: > | memset(&hostdata->madapter_info, 0x00, > | sizeof(hostdata->madapter_info)); > > 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. > > 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-harden...@vger.kernel.org > Signed-off-by: Justin Stitt > --- > Note: build-tested only. I gave it a quick boot, no issues. Tested-by: Michael Ellerman (powerpc) cheers
Re: [PATCH] scsi: ibmvscsi: replace deprecated strncpy with strscpy
On Mon, Oct 30, 2023 at 08:40:48PM +, Justin Stitt wrote: > 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 expect partition_name to be NUL-terminated based on its usage with > format strings: > | dev_info(hostdata->dev, "host srp version: %s, " > |"host partition %s (%d), OS %d, max io %u\n", > |hostdata->madapter_info.srp_version, > |hostdata->madapter_info.partition_name, > |be32_to_cpu(hostdata->madapter_info.partition_number), > |be32_to_cpu(hostdata->madapter_info.os_type), > |be32_to_cpu(hostdata->madapter_info.port_max_txu[0])); > ... > | len = snprintf(buf, PAGE_SIZE, "%s\n", > |hostdata->madapter_info.partition_name); > > Moreover, NUL-padding is not required as madapter_info is explicitly > memset to 0: > | memset(&hostdata->madapter_info, 0x00, > | sizeof(hostdata->madapter_info)); > > 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. > > 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-harden...@vger.kernel.org > Signed-off-by: Justin Stitt Agreed; this conversion looks correct to me too. Reviewed-by: Kees Cook -- Kees Cook
[PATCH] scsi: ibmvscsi: 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 expect partition_name to be NUL-terminated based on its usage with
format strings:
| dev_info(hostdata->dev, "host srp version: %s, "
|"host partition %s (%d), OS %d, max io %u\n",
|hostdata->madapter_info.srp_version,
|hostdata->madapter_info.partition_name,
|be32_to_cpu(hostdata->madapter_info.partition_number),
|be32_to_cpu(hostdata->madapter_info.os_type),
|be32_to_cpu(hostdata->madapter_info.port_max_txu[0]));
...
| len = snprintf(buf, PAGE_SIZE, "%s\n",
|hostdata->madapter_info.partition_name);
Moreover, NUL-padding is not required as madapter_info is explicitly
memset to 0:
| memset(&hostdata->madapter_info, 0x00,
| sizeof(hostdata->madapter_info));
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.
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-harden...@vger.kernel.org
Signed-off-by: Justin Stitt
---
Note: build-tested only.
Found with: $ rg "strncpy\("
---
drivers/scsi/ibmvscsi/ibmvscsi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 59599299615d..71f3e9563520 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -266,7 +266,7 @@ static void set_adapter_info(struct ibmvscsi_host_data
*hostdata)
dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION);
strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);
- strncpy(hostdata->madapter_info.partition_name, partition_name,
+ strscpy(hostdata->madapter_info.partition_name, partition_name,
sizeof(hostdata->madapter_info.partition_name));
hostdata->madapter_info.partition_number =
---
base-commit: ffc253263a1375a65fa6c9f62a893e9767fbebfa
change-id: 20231030-strncpy-drivers-scsi-ibmvscsi-ibmvscsi-c-3b5019ce50ad
Best regards,
--
Justin Stitt
