strncpy() is deprecated for NUL-terminated destination buffers. Replace
memset() and strncpy() with strscpy_pad() to copy the version string and
fill the remaining bytes in the destination buffer with NUL bytes. This
avoids zeroing the memory before copying the string.

Compile-tested only.

Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
Changes in v2:
- Use len instead of len - 1
- Link to v1: https://lore.kernel.org/r/20250212224352.86583-3-thorsten.blum@linux.dev/
---
 drivers/scsi/hpsa.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index c7ebae24b09f..968cefb497eb 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -7236,8 +7236,7 @@ static int hpsa_controller_hard_reset(struct pci_dev *pdev,
 
 static void init_driver_version(char *driver_version, int len)
 {
-	memset(driver_version, 0, len);
-	strncpy(driver_version, HPSA " " HPSA_DRIVER_VERSION, len - 1);
+	strscpy_pad(driver_version, HPSA " " HPSA_DRIVER_VERSION, len);
 }
 
 static int write_driver_ver_to_cfgtable(struct CfgTable __iomem *cfgtable)
-- 
2.48.1

Thorsten,

> strncpy() is deprecated for NUL-terminated destination buffers.
> Replace memset() and strncpy() with strscpy_pad() to copy the version
> string and fill the remaining bytes in the destination buffer with NUL
> bytes. This avoids zeroing the memory before copying the string.

Applied to 6.15/scsi-staging, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering

On 2/13/25 3:40 AM, Thorsten Blum wrote:
> diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
> index c7ebae24b09f..968cefb497eb 100644
> --- a/drivers/scsi/hpsa.c
> +++ b/drivers/scsi/hpsa.c
> @@ -7236,8 +7236,7 @@ static int hpsa_controller_hard_reset(struct pci_dev *pdev,
>   
>   static void init_driver_version(char *driver_version, int len)
>   {
> -	memset(driver_version, 0, len);
> -	strncpy(driver_version, HPSA " " HPSA_DRIVER_VERSION, len - 1);
> +	strscpy_pad(driver_version, HPSA " " HPSA_DRIVER_VERSION, len);
>   }
>   
>   static int write_driver_ver_to_cfgtable(struct CfgTable __iomem *cfgtable)

Has it been considered to introduce a Coccinelle semantic patch that
performs this conversion? See also the scripts/coccinelle directory.

Anyway:

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

On Thu, Feb 13, 2025 at 10:24:25AM -0800, Bart Van Assche wrote:
> On 2/13/25 3:40 AM, Thorsten Blum wrote:
> > diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
> > index c7ebae24b09f..968cefb497eb 100644
> > --- a/drivers/scsi/hpsa.c
> > +++ b/drivers/scsi/hpsa.c
> > @@ -7236,8 +7236,7 @@ static int hpsa_controller_hard_reset(struct pci_dev *pdev,
> >   static void init_driver_version(char *driver_version, int len)
> >   {
> > -	memset(driver_version, 0, len);
> > -	strncpy(driver_version, HPSA " " HPSA_DRIVER_VERSION, len - 1);
> > +	strscpy_pad(driver_version, HPSA " " HPSA_DRIVER_VERSION, len);
> >   }
> >   static int write_driver_ver_to_cfgtable(struct CfgTable __iomem *cfgtable)
> 
> Has it been considered to introduce a Coccinelle semantic patch that
> performs this conversion? See also the scripts/coccinelle directory.

Using this:

@pad0 depends on !(file in "tools") && !(file in "samples")@
expression DEST, SRC;
expression LENGTH;
@@

-     memset(DEST, 0, LENGTH);
-     strncpy(DEST, SRC, LENGTH - 1);
+     strscpy_pad(DEST, SRC, LENGTH);

@padNUL depends on !(file in "tools") && !(file in "samples")@
expression DEST, SRC;
expression LENGTH;
@@

-     memset(DEST, '\0', LENGTH);
-     strncpy(DEST, SRC, LENGTH - 1);
+     strscpy_pad(DEST, SRC, LENGTH);

It turns out this is the only place left in the kernel using that
pattern. :)

> 
> Anyway:
> 
> Reviewed-by: Bart Van Assche <bvanassche@acm.org>

Reviewed-by: Kees Cook <kees@kernel.org>

-- 
Kees Cook