On 8 December 2015 at 22:12, Nicolas Iooss <nicolas.iooss_linux@xxxxxxx> wrote:
> drm_dev_set_unique() uses a format string to define the unique name of a
> device. This feature is not used as currently all the calls to this
> function either use "%s" as a format string or directly use
> dev_name().
>
> Even though this second kind of call does not introduce security
> problems, because there cannot be "%" characters in dev_name() results,
> gcc issues a warning when building with -Wformat-security flag
> ("warning: format string is not a string literal (potentially
> insecure)"). This warning is useful to find real bugs like the one
> fixed by commit 3958b79266b1 ("configfs: fix kernel infoleak through
> user-controlled format string"). False positives which do not bring
> an extra value make the work of finding real bugs harder.
>
> Therefore remove the format-string feature from drm_dev_set_unique().
>
> Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@xxxxxxx>
> ---
> drivers/gpu/drm/drm_drv.c | 11 +++--------
> drivers/gpu/drm/nouveau/nouveau_drm.c | 2 +-
> drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 2 +-
> include/drm/drmP.h | 2 +-
> 4 files changed, 6 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 7dd6728dd092..20eaa0aae205 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -797,7 +797,7 @@ EXPORT_SYMBOL(drm_dev_unregister);
> /**
> * drm_dev_set_unique - Set the unique name of a DRM device
> * @dev: device of which to set the unique name
> - * @fmt: format string for unique name
> + * @name: unique name
> *
> * Sets the unique name of a DRM device using the specified format string and
> * a variable list of arguments. Drivers can use this at driver probe time if
You might want to also update the above hunk :-)
-Emil
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