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3b2894c967
`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 should NUL-pad as there are full struct copies happening in places:
| struct drm_mode_modeinfo umode;
|
| ...
| struct drm_property_blob *blob;
|
| drm_mode_convert_to_umode(&umode, mode);
| blob = drm_property_create_blob(crtc->dev,
| sizeof(umode), &umode);
A suitable replacement is `strscpy_pad` due to the fact that it
guarantees both NUL-termination and NUL-padding on the destination
buffer.
Additionally, replace size macro `DRM_DISPLAY_MODE_LEN` with sizeof() to
more directly tie the maximum buffer size to the destination buffer:
| struct drm_display_mode {
| ...
| char name[DRM_DISPLAY_MODE_LEN];
Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Cc: Xu Panda <xu.panda@zte.com.cn>
Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20231016-strncpy-drivers-gpu-drm-drm_modes-c-v2-1-d0b60686e1c6@google.com
Signed-off-by: Kees Cook <keescook@chromium.org>
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Linux kernel
============
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