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Message-Id: <20230922175407.work.754-kees@kernel.org>
Date: Fri, 22 Sep 2023 10:54:08 -0700
From: Kees Cook <keescook@...omium.org>
To: David Howells <dhowells@...hat.com>
Cc: Kees Cook <keescook@...omium.org>,
Randy Dunlap <rdunlap@...radead.org>,
Al Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>,
Jonathan Corbet <corbet@....net>,
Siddh Raman Pant <code@...dh.me>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Qian Cai <cai@...hat.com>,
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] watch_queue: Annotate struct watch_filter 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 watch_filter.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: David Howells <dhowells@...hat.com>
Cc: Randy Dunlap <rdunlap@...radead.org>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Christian Brauner <brauner@...nel.org>
Cc: Jonathan Corbet <corbet@....net>
Cc: Siddh Raman Pant <code@...dh.me>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Qian Cai <cai@...hat.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
include/linux/watch_queue.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/watch_queue.h b/include/linux/watch_queue.h
index 45cd42f55d49..429c7b6afead 100644
--- a/include/linux/watch_queue.h
+++ b/include/linux/watch_queue.h
@@ -32,7 +32,7 @@ struct watch_filter {
DECLARE_BITMAP(type_filter, WATCH_TYPE__NR);
};
u32 nr_filters; /* Number of filters */
- struct watch_type_filter filters[];
+ struct watch_type_filter filters[] __counted_by(nr_filters);
};
struct watch_queue {
--
2.34.1
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