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Message-Id: <20230817204144.never.605-kees@kernel.org>
Date: Thu, 17 Aug 2023 13:41:47 -0700
From: Kees Cook <keescook@...omium.org>
To: Georgi Djakov <djakov@...nel.org>
Cc: Kees Cook <keescook@...omium.org>, linux-pm@...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] interconnect: Annotate struct icc_path 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 icc_path.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Georgi Djakov <djakov@...nel.org>
Cc: linux-pm@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
drivers/interconnect/internal.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/interconnect/internal.h b/drivers/interconnect/internal.h
index f5f82a5c939e..b30856db523d 100644
--- a/drivers/interconnect/internal.h
+++ b/drivers/interconnect/internal.h
@@ -38,7 +38,7 @@ struct icc_req {
struct icc_path {
const char *name;
size_t num_nodes;
- struct icc_req reqs[];
+ struct icc_req reqs[] __counted_by(num_nodes);
};
#endif
--
2.34.1
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