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Message-Id: <20231006201749.work.432-kees@kernel.org> Date: Fri, 6 Oct 2023 13:17:49 -0700 From: Kees Cook <keescook@...omium.org> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: Kees Cook <keescook@...omium.org>, "Rafael J. Wysocki" <rafael@...nel.org>, "Gustavo A. R. Silva" <gustavoars@...nel.org>, linux-hardening@...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 Subject: [PATCH] driver core: platform: Annotate struct irq_affinity_devres 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 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_affinity_devres. Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: "Rafael J. Wysocki" <rafael@...nel.org> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org> Cc: linux-hardening@...r.kernel.org Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1] Signed-off-by: Kees Cook <keescook@...omium.org> --- drivers/base/platform.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/base/platform.c b/drivers/base/platform.c index 76bfcba25003..07216889d3ba 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -291,7 +291,7 @@ EXPORT_SYMBOL_GPL(platform_irq_count); struct irq_affinity_devres { unsigned int count; - unsigned int irq[]; + unsigned int irq[] __counted_by(count); }; static void platform_disable_acpi_irq(struct platform_device *pdev, int index) -- 2.34.1
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