From: Kees Cook <keescook@chromium.org>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Kees Cook <keescook@chromium.org>,
linux-input@vger.kernel.org,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Tom Rix <trix@redhat.com>,
linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
linux-hardening@vger.kernel.org
Subject: [PATCH] input: mt: Annotate struct input_mt with __counted_by
Date: Fri, 22 Sep 2023 10:50:37 -0700 [thread overview]
Message-ID: <20230922175036.work.762-kees@kernel.org> (raw)
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 input_mt.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
include/linux/input/mt.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/input/mt.h b/include/linux/input/mt.h
index 3b8580bd33c1..2cf89a538b18 100644
--- a/include/linux/input/mt.h
+++ b/include/linux/input/mt.h
@@ -47,7 +47,7 @@ struct input_mt {
unsigned int flags;
unsigned int frame;
int *red;
- struct input_mt_slot slots[];
+ struct input_mt_slot slots[] __counted_by(num_slots);
};
static inline void input_mt_set_value(struct input_mt_slot *slot,
--
2.34.1
next reply other threads:[~2023-09-22 17:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-22 17:50 Kees Cook [this message]
2023-09-23 16:29 ` [PATCH] input: mt: Annotate struct input_mt with __counted_by Gustavo A. R. Silva
2023-09-30 16:38 ` Dmitry Torokhov
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