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Message-Id: <20230817203501.never.279-kees@kernel.org>
Date: Thu, 17 Aug 2023 13:35:02 -0700
From: Kees Cook <keescook@...omium.org>
To: Paul Moore <paul@...l-moore.com>
Cc: Kees Cook <keescook@...omium.org>, Eric Paris <eparis@...hat.com>,
audit@...r.kernel.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] audit: Annotate struct audit_chunk 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 audit_chunk.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Paul Moore <paul@...l-moore.com>
Cc: Eric Paris <eparis@...hat.com>
Cc: audit@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
kernel/audit_tree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index e867c17d3f84..85a5b306733b 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -34,7 +34,7 @@ struct audit_chunk {
struct list_head list;
struct audit_tree *owner;
unsigned index; /* index; upper bit indicates 'will prune' */
- } owners[];
+ } owners[] __counted_by(count);
};
struct audit_tree_mark {
--
2.34.1
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