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Message-Id: <20230922175127.work.214-kees@kernel.org>
Date: Fri, 22 Sep 2023 10:51:27 -0700
From: Kees Cook <keescook@...omium.org>
To: Marc Zyngier <maz@...nel.org>
Cc: Kees Cook <keescook@...omium.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] irqdomain: Annotate struct irq_domain 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 irq_domain.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Marc Zyngier <maz@...nel.org>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
include/linux/irqdomain.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 51c254b7fec2..ee0a82c60508 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -174,7 +174,7 @@ struct irq_domain {
irq_hw_number_t hwirq_max;
unsigned int revmap_size;
struct radix_tree_root revmap_tree;
- struct irq_data __rcu *revmap[];
+ struct irq_data __rcu *revmap[] __counted_by(revmap_size);
};
/* Irq domain flags */
--
2.34.1
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