`strncpy` is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.
Moreover, `strncat` shouldn't really be used either as per
fortify-string.h:
* Do not use this function. While FORTIFY_SOURCE tries to avoid
* read and write overflows, this is only possible when the sizes
* of @p and @q are known to the compiler. Prefer building the
* string with formatting, via scnprintf() or similar.
Instead, use `scnprintf` with "%s%s" format string. This code is now
more readable and robust.
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: [email protected]
Signed-off-by: Justin Stitt <[email protected]>
---
Note: build-tested only.
---
drivers/net/ethernet/intel/i40e/i40e_ddp.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_ddp.c b/drivers/net/ethernet/intel/i40e/i40e_ddp.c
index 0e72abd178ae..ec25e4be250f 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ddp.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ddp.c
@@ -438,10 +438,9 @@ int i40e_ddp_flash(struct net_device *netdev, struct ethtool_flash *flash)
char profile_name[sizeof(I40E_DDP_PROFILE_PATH)
+ I40E_DDP_PROFILE_NAME_MAX];
- profile_name[sizeof(profile_name) - 1] = 0;
- strncpy(profile_name, I40E_DDP_PROFILE_PATH,
- sizeof(profile_name) - 1);
- strncat(profile_name, flash->data, I40E_DDP_PROFILE_NAME_MAX);
+ scnprintf(profile_name, sizeof(profile_name), "%s%s",
+ I40E_DDP_PROFILE_PATH, flash->data);
+
/* Load DDP recipe. */
status = request_firmware(&ddp_config, profile_name,
&netdev->dev);
---
base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
change-id: 20231010-strncpy-drivers-net-ethernet-intel-i40e-i40e_ddp-c-dd7f20b7ed5d
Best regards,
--
Justin Stitt <[email protected]>
On 10/10/2023 1:53 PM, 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.
>
> Moreover, `strncat` shouldn't really be used either as per
> fortify-string.h:
> * Do not use this function. While FORTIFY_SOURCE tries to avoid
> * read and write overflows, this is only possible when the sizes
> * of @p and @q are known to the compiler. Prefer building the
> * string with formatting, via scnprintf() or similar.
>
> Instead, use `scnprintf` with "%s%s" format string. This code is now
> more readable and robust.
Please see my comments on the igbvf patch.
On Tue, Oct 10, 2023 at 08:53:00PM +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.
>
> Moreover, `strncat` shouldn't really be used either as per
> fortify-string.h:
> * Do not use this function. While FORTIFY_SOURCE tries to avoid
> * read and write overflows, this is only possible when the sizes
> * of @p and @q are known to the compiler. Prefer building the
> * string with formatting, via scnprintf() or similar.
>
> Instead, use `scnprintf` with "%s%s" format string. This code is now
> more readable and robust.
>
> 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: [email protected]
> Signed-off-by: Justin Stitt <[email protected]>
> ---
> Note: build-tested only.
> ---
> drivers/net/ethernet/intel/i40e/i40e_ddp.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_ddp.c b/drivers/net/ethernet/intel/i40e/i40e_ddp.c
> index 0e72abd178ae..ec25e4be250f 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_ddp.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_ddp.c
> @@ -438,10 +438,9 @@ int i40e_ddp_flash(struct net_device *netdev, struct ethtool_flash *flash)
> char profile_name[sizeof(I40E_DDP_PROFILE_PATH)
> + I40E_DDP_PROFILE_NAME_MAX];
>
> - profile_name[sizeof(profile_name) - 1] = 0;
> - strncpy(profile_name, I40E_DDP_PROFILE_PATH,
> - sizeof(profile_name) - 1);
> - strncat(profile_name, flash->data, I40E_DDP_PROFILE_NAME_MAX);
> + scnprintf(profile_name, sizeof(profile_name), "%s%s",
> + I40E_DDP_PROFILE_PATH, flash->data);
> +
> /* Load DDP recipe. */
> status = request_firmware(&ddp_config, profile_name,
> &netdev->dev);
>
> ---
> base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
> change-id: 20231010-strncpy-drivers-net-ethernet-intel-i40e-i40e_ddp-c-dd7f20b7ed5d
>
> Best regards,
> --
> Justin Stitt <[email protected]>
>
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/