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* [PATCH] e1000: replace deprecated strncpy with strscpy
@ 2023-10-10 18:35 ` Justin Stitt
  0 siblings, 0 replies; 4+ messages in thread
From: Justin Stitt @ 2023-10-10 18:35 UTC (permalink / raw)
  To: Jesse Brandeburg, Tony Nguyen, David S. Miller, Eric Dumazet,
	Jakub Kicinski, Paolo Abeni
  Cc: intel-wired-lan, netdev, linux-kernel, linux-hardening, Justin Stitt

`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 can see that netdev->name is expected to be NUL-terminated based on
it's usage with format strings:
|       pr_info("%s NIC Link is Down\n",
|               netdev->name);

A suitable replacement is `strscpy` [2] due to the fact that it
guarantees NUL-termination on the destination buffer without
unnecessarily NUL-padding.

This is in line with other uses of strscpy on netdev->name:
$ rg "strscpy\(netdev\->name.*pci.*"

drivers/net/ethernet/intel/e1000e/netdev.c
7455:   strscpy(netdev->name, pci_name(pdev), sizeof(netdev->name));

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
10839:  strscpy(netdev->name, pci_name(pdev), sizeof(netdev->name));

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>
---
Note: build-tested only.
---
 drivers/net/ethernet/intel/e1000/e1000_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
index da6e303ad99b..1d1e93686af2 100644
--- a/drivers/net/ethernet/intel/e1000/e1000_main.c
+++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
@@ -1014,7 +1014,7 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	netdev->watchdog_timeo = 5 * HZ;
 	netif_napi_add(netdev, &adapter->napi, e1000_clean);
 
-	strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
+	strscpy(netdev->name, pci_name(pdev), sizeof(netdev->name));
 
 	adapter->bd_number = cards_found;
 

---
base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
change-id: 20231010-strncpy-drivers-net-ethernet-intel-e1000-e1000_main-c-a45ddd89e0d7

Best regards,
--
Justin Stitt <justinstitt@google.com>


^ permalink raw reply related	[flat|nested] 4+ messages in thread
* [Intel-wired-lan] [PATCH] e1000: replace deprecated strncpy with strscpy
@ 2023-10-10 18:35 ` Justin Stitt
  0 siblings, 0 replies; 4+ messages in thread
From: Justin Stitt @ 2023-10-10 18:35 UTC (permalink / raw)
  To: Jesse Brandeburg, Tony Nguyen, David S. Miller, Eric Dumazet,
	Jakub Kicinski, Paolo Abeni
  Cc: netdev, Justin Stitt, intel-wired-lan, linux-kernel, linux-hardening

`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 can see that netdev->name is expected to be NUL-terminated based on
it's usage with format strings:
|       pr_info("%s NIC Link is Down\n",
|               netdev->name);

A suitable replacement is `strscpy` [2] due to the fact that it
guarantees NUL-termination on the destination buffer without
unnecessarily NUL-padding.

This is in line with other uses of strscpy on netdev->name:
$ rg "strscpy\(netdev\->name.*pci.*"

drivers/net/ethernet/intel/e1000e/netdev.c
7455:   strscpy(netdev->name, pci_name(pdev), sizeof(netdev->name));

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
10839:  strscpy(netdev->name, pci_name(pdev), sizeof(netdev->name));

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>
---
Note: build-tested only.
---
 drivers/net/ethernet/intel/e1000/e1000_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
index da6e303ad99b..1d1e93686af2 100644
--- a/drivers/net/ethernet/intel/e1000/e1000_main.c
+++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
@@ -1014,7 +1014,7 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	netdev->watchdog_timeo = 5 * HZ;
 	netif_napi_add(netdev, &adapter->napi, e1000_clean);
 
-	strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
+	strscpy(netdev->name, pci_name(pdev), sizeof(netdev->name));
 
 	adapter->bd_number = cards_found;
 

---
base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
change-id: 20231010-strncpy-drivers-net-ethernet-intel-e1000-e1000_main-c-a45ddd89e0d7

Best regards,
--
Justin Stitt <justinstitt@google.com>

_______________________________________________
Intel-wired-lan mailing list
Intel-wired-lan@osuosl.org
https://lists.osuosl.org/mailman/listinfo/intel-wired-lan

^ permalink raw reply related	[flat|nested] 4+ messages in thread
* Re: [PATCH] e1000: replace deprecated strncpy with strscpy
  2023-10-10 18:35 ` [Intel-wired-lan] " Justin Stitt
@ 2023-10-10 22:36   ` Justin Stitt
  -1 siblings, 0 replies; 4+ messages in thread
From: Justin Stitt @ 2023-10-10 22:36 UTC (permalink / raw)
  To: Jesse Brandeburg, Tony Nguyen, David S. Miller, Eric Dumazet,
	Jakub Kicinski, Paolo Abeni
  Cc: intel-wired-lan, netdev, linux-kernel, linux-hardening

On Tue, Oct 10, 2023 at 06:35:59PM +0000, 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 can see that netdev->name is expected to be NUL-terminated based on
> it's usage with format strings:
> |       pr_info("%s NIC Link is Down\n",
> |               netdev->name);
>
> A suitable replacement is `strscpy` [2] due to the fact that it
> guarantees NUL-termination on the destination buffer without
> unnecessarily NUL-padding.
>
> This is in line with other uses of strscpy on netdev->name:
> $ rg "strscpy\(netdev\->name.*pci.*"
>
> drivers/net/ethernet/intel/e1000e/netdev.c
> 7455:   strscpy(netdev->name, pci_name(pdev), sizeof(netdev->name));
>
> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> 10839:  strscpy(netdev->name, pci_name(pdev), sizeof(netdev->name));
>
> 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>
> ---
> Note: build-tested only.
> ---
>  drivers/net/ethernet/intel/e1000/e1000_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
> index da6e303ad99b..1d1e93686af2 100644
> --- a/drivers/net/ethernet/intel/e1000/e1000_main.c
> +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
> @@ -1014,7 +1014,7 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	netdev->watchdog_timeo = 5 * HZ;
>  	netif_napi_add(netdev, &adapter->napi, e1000_clean);
>
> -	strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
> +	strscpy(netdev->name, pci_name(pdev), sizeof(netdev->name));
>
>  	adapter->bd_number = cards_found;
>
>
> ---
> base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
> change-id: 20231010-strncpy-drivers-net-ethernet-intel-e1000-e1000_main-c-a45ddd89e0d7
>
> Best regards,
> --
> Justin Stitt <justinstitt@google.com>
>
Hi, this patch was bundled up with some others. It has a new home:

https://lore.kernel.org/all/20231010-netdev-replace-strncpy-resend-as-series-v1-0-caf9f0f2f021@google.com/

^ permalink raw reply	[flat|nested] 4+ messages in thread
* Re: [Intel-wired-lan] [PATCH] e1000: replace deprecated strncpy with strscpy
@ 2023-10-10 22:36   ` Justin Stitt
  0 siblings, 0 replies; 4+ messages in thread
From: Justin Stitt @ 2023-10-10 22:36 UTC (permalink / raw)
  To: Jesse Brandeburg, Tony Nguyen, David S. Miller, Eric Dumazet,
	Jakub Kicinski, Paolo Abeni
  Cc: netdev, intel-wired-lan, linux-kernel, linux-hardening

On Tue, Oct 10, 2023 at 06:35:59PM +0000, 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 can see that netdev->name is expected to be NUL-terminated based on
> it's usage with format strings:
> |       pr_info("%s NIC Link is Down\n",
> |               netdev->name);
>
> A suitable replacement is `strscpy` [2] due to the fact that it
> guarantees NUL-termination on the destination buffer without
> unnecessarily NUL-padding.
>
> This is in line with other uses of strscpy on netdev->name:
> $ rg "strscpy\(netdev\->name.*pci.*"
>
> drivers/net/ethernet/intel/e1000e/netdev.c
> 7455:   strscpy(netdev->name, pci_name(pdev), sizeof(netdev->name));
>
> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> 10839:  strscpy(netdev->name, pci_name(pdev), sizeof(netdev->name));
>
> 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>
> ---
> Note: build-tested only.
> ---
>  drivers/net/ethernet/intel/e1000/e1000_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
> index da6e303ad99b..1d1e93686af2 100644
> --- a/drivers/net/ethernet/intel/e1000/e1000_main.c
> +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
> @@ -1014,7 +1014,7 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	netdev->watchdog_timeo = 5 * HZ;
>  	netif_napi_add(netdev, &adapter->napi, e1000_clean);
>
> -	strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
> +	strscpy(netdev->name, pci_name(pdev), sizeof(netdev->name));
>
>  	adapter->bd_number = cards_found;
>
>
> ---
> base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
> change-id: 20231010-strncpy-drivers-net-ethernet-intel-e1000-e1000_main-c-a45ddd89e0d7
>
> Best regards,
> --
> Justin Stitt <justinstitt@google.com>
>
Hi, this patch was bundled up with some others. It has a new home:

https://lore.kernel.org/all/20231010-netdev-replace-strncpy-resend-as-series-v1-0-caf9f0f2f021@google.com/
_______________________________________________
Intel-wired-lan mailing list
Intel-wired-lan@osuosl.org
https://lists.osuosl.org/mailman/listinfo/intel-wired-lan

^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-10-12 19:08 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2023-10-10 18:35 [PATCH] e1000: replace deprecated strncpy with strscpy Justin Stitt
2023-10-10 18:35 ` [Intel-wired-lan] " Justin Stitt
2023-10-10 22:36 ` Justin Stitt
2023-10-10 22:36   ` [Intel-wired-lan] " Justin Stitt

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