From: Nathan Chancellor nathan@kernel.org
[ Upstream commit 6c4e4d35203301906afb53c6d1e1302d4c793c05 ]
With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG), indirect call targets are validated against the expected function pointer prototype to make sure the call target is valid to help mitigate ROP attacks. If they are not identical, there is a failure at run time, which manifests as either a kernel panic or thread getting killed. A proposed warning in clang aims to catch these at compile time, which reveals:
drivers/gpu/drm/meson/meson_encoder_cvbs.c:211:16: error: incompatible function pointer types initializing 'enum drm_mode_status (*)(struct drm_bridge *, const struct drm_display_info *, const struct drm_display_mode *)' with an expression of type 'int (struct drm_bridge *, const struct drm_display_info *, const struct drm_display_mode *)' [-Werror,-Wincompatible-function-pointer-types-strict] .mode_valid = meson_encoder_cvbs_mode_valid, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1 error generated.
->mode_valid() in 'struct drm_bridge_funcs' expects a return type of 'enum drm_mode_status', not 'int'. Adjust the return type of meson_encoder_cvbs_mode_valid() to match the prototype's to resolve the warning and CFI failure.
Link: https://github.com/ClangBuiltLinux/linux/issues/1750 Reported-by: Sami Tolvanen samitolvanen@google.com Signed-off-by: Nathan Chancellor nathan@kernel.org Reviewed-by: Kees Cook keescook@chromium.org Signed-off-by: Neil Armstrong neil.armstrong@linaro.org Link: https://patchwork.freedesktop.org/patch/msgid/20221102155242.1927166-1-natha... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/meson/meson_encoder_cvbs.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/meson/meson_encoder_cvbs.c b/drivers/gpu/drm/meson/meson_encoder_cvbs.c index 5675bc2a92cf..3f73b211fa8e 100644 --- a/drivers/gpu/drm/meson/meson_encoder_cvbs.c +++ b/drivers/gpu/drm/meson/meson_encoder_cvbs.c @@ -116,9 +116,10 @@ static int meson_encoder_cvbs_get_modes(struct drm_bridge *bridge, return i; }
-static int meson_encoder_cvbs_mode_valid(struct drm_bridge *bridge, - const struct drm_display_info *display_info, - const struct drm_display_mode *mode) +static enum drm_mode_status +meson_encoder_cvbs_mode_valid(struct drm_bridge *bridge, + const struct drm_display_info *display_info, + const struct drm_display_mode *mode) { if (meson_cvbs_get_mode(mode)) return MODE_OK;