`strncpy` is deprecated for use on NUL-terminated destination strings [1].
We should prefer more robust and less ambiguous string interfaces.
Since `chan->base.name` is expected to be NUL-terminated, a suitable
replacement is `strscpy` [2] due to the fact that it guarantees
NUL-termination on the destination buffer without also unnecessarily
NUL-padding (since `chan` is kzalloc'd already).
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]>
---
Changes in v2:
- use sizeof() instead of I2C_NAME_SIZE (thanks Kees, Patrik)
- Link to v1: https://lore.kernel.org/r/20230914-drivers-gpu-drm-gma500-oaktrail_lvds_i2c-c-v1-1-0a53a076ce20@google.com
---
drivers/gpu/drm/gma500/oaktrail_lvds_i2c.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/gma500/oaktrail_lvds_i2c.c b/drivers/gpu/drm/gma500/oaktrail_lvds_i2c.c
index 06b5b2d70d48..939c53fd09e8 100644
--- a/drivers/gpu/drm/gma500/oaktrail_lvds_i2c.c
+++ b/drivers/gpu/drm/gma500/oaktrail_lvds_i2c.c
@@ -141,7 +141,7 @@ struct gma_i2c_chan *oaktrail_lvds_i2c_init(struct drm_device *dev)
chan->drm_dev = dev;
chan->reg = dev_priv->lpc_gpio_base;
- strncpy(chan->base.name, "gma500 LPC", I2C_NAME_SIZE - 1);
+ strscpy(chan->base.name, "gma500 LPC", sizeof(chan->base.name));
chan->base.owner = THIS_MODULE;
chan->base.algo_data = &chan->algo;
chan->base.dev.parent = dev->dev;
---
base-commit: 3669558bdf354cd352be955ef2764cde6a9bf5ec
change-id: 20230914-drivers-gpu-drm-gma500-oaktrail_lvds_i2c-c-a53c6d8bd62f
Best regards,
--
Justin Stitt <[email protected]>
On Tue, Sep 19, 2023 at 04:41:16AM +0000, Justin Stitt wrote:
> `strncpy` is deprecated for use on NUL-terminated destination strings [1].
>
> We should prefer more robust and less ambiguous string interfaces.
>
> Since `chan->base.name` is expected to be NUL-terminated, a suitable
> replacement is `strscpy` [2] due to the fact that it guarantees
> NUL-termination on the destination buffer without also unnecessarily
> NUL-padding (since `chan` is kzalloc'd already).
>
> 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]>
Thanks, looks good. If a v3 is needed, Subject can be improved to be
"...: Replace strncpy with strscpy".
Reviewed-by: Kees Cook <[email protected]>
--
Kees Cook
On Tue, Sep 19, 2023 at 04:41:16AM +0000, Justin Stitt wrote:
> `strncpy` is deprecated for use on NUL-terminated destination strings [1].
>
> We should prefer more robust and less ambiguous string interfaces.
>
> Since `chan->base.name` is expected to be NUL-terminated, a suitable
> replacement is `strscpy` [2] due to the fact that it guarantees
> NUL-termination on the destination buffer without also unnecessarily
> NUL-padding (since `chan` is kzalloc'd already).
>
> 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]>
Applied to drm-misc-next.
Thanks
Patrik
> ---
> Changes in v2:
> - use sizeof() instead of I2C_NAME_SIZE (thanks Kees, Patrik)
> - Link to v1: https://lore.kernel.org/r/20230914-drivers-gpu-drm-gma500-oaktrail_lvds_i2c-c-v1-1-0a53a076ce20@google.com
> ---
> drivers/gpu/drm/gma500/oaktrail_lvds_i2c.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/gma500/oaktrail_lvds_i2c.c b/drivers/gpu/drm/gma500/oaktrail_lvds_i2c.c
> index 06b5b2d70d48..939c53fd09e8 100644
> --- a/drivers/gpu/drm/gma500/oaktrail_lvds_i2c.c
> +++ b/drivers/gpu/drm/gma500/oaktrail_lvds_i2c.c
> @@ -141,7 +141,7 @@ struct gma_i2c_chan *oaktrail_lvds_i2c_init(struct drm_device *dev)
>
> chan->drm_dev = dev;
> chan->reg = dev_priv->lpc_gpio_base;
> - strncpy(chan->base.name, "gma500 LPC", I2C_NAME_SIZE - 1);
> + strscpy(chan->base.name, "gma500 LPC", sizeof(chan->base.name));
> chan->base.owner = THIS_MODULE;
> chan->base.algo_data = &chan->algo;
> chan->base.dev.parent = dev->dev;
>
> ---
> base-commit: 3669558bdf354cd352be955ef2764cde6a9bf5ec
> change-id: 20230914-drivers-gpu-drm-gma500-oaktrail_lvds_i2c-c-a53c6d8bd62f
>
> Best regards,
> --
> Justin Stitt <[email protected]>
>