From: Kees Cook <keescook@chromium.org>
To: Jan Kara <jack@suse.com>
Cc: Kees Cook <keescook@chromium.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] udf: Annotate struct udf_bitmap with __counted_by
Date: Fri, 15 Sep 2023 13:14:05 -0700 [thread overview]
Message-ID: <20230915201404.never.574-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 udf_bitmap.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Jan Kara <jack@suse.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
fs/udf/udf_sb.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h
index 9af6ff7f9747..f9a60bc1abcf 100644
--- a/fs/udf/udf_sb.h
+++ b/fs/udf/udf_sb.h
@@ -86,7 +86,7 @@ struct udf_virtual_data {
struct udf_bitmap {
__u32 s_extPosition;
int s_nr_groups;
- struct buffer_head *s_block_bitmap[];
+ struct buffer_head *s_block_bitmap[] __counted_by(s_nr_groups);
};
struct udf_part_map {
--
2.34.1
next reply other threads:[~2023-09-15 20:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-15 20:14 Kees Cook [this message]
2023-09-15 20:50 ` [PATCH] udf: Annotate struct udf_bitmap with __counted_by Gustavo A. R. Silva
2023-09-18 7:10 ` Jan Kara
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