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Message-Id: <20230922175137.work.062-kees@kernel.org>
Date: Fri, 22 Sep 2023 10:51:37 -0700
From: Kees Cook <keescook@...omium.org>
To: Helge Deller <deller@....de>
Cc: Kees Cook <keescook@...omium.org>,
linux-fbdev@...r.kernel.org,
dri-devel@...ts.freedesktop.org,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Tom Rix <trix@...hat.com>,
linux-kernel@...r.kernel.org,
llvm@...ts.linux.dev,
linux-hardening@...r.kernel.org
Subject: [PATCH] video: fbdev: mmp: Annotate struct mmphw_ctrl with __counted_by
Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).
As found with Coccinelle[1], add __counted_by for struct mmphw_ctrl.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Helge Deller <deller@....de>
Cc: linux-fbdev@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
drivers/video/fbdev/mmp/hw/mmp_ctrl.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/mmp/hw/mmp_ctrl.h b/drivers/video/fbdev/mmp/hw/mmp_ctrl.h
index 167585a889d3..719b99a9bc77 100644
--- a/drivers/video/fbdev/mmp/hw/mmp_ctrl.h
+++ b/drivers/video/fbdev/mmp/hw/mmp_ctrl.h
@@ -1406,7 +1406,7 @@ struct mmphw_ctrl {
/*pathes*/
int path_num;
- struct mmphw_path_plat path_plats[];
+ struct mmphw_path_plat path_plats[] __counted_by(path_num);
};
static inline int overlay_is_vid(struct mmp_overlay *overlay)
--
2.34.1
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