linux-hardening - Re: [PATCH] virt: acrn: Annotate struct vm_memory_region_batch with __counted

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Message-Id: <169662486907.2156024.1367197877614723586.b4-ty@chromium.org>
Date: Fri,  6 Oct 2023 13:41:13 -0700
From: Kees Cook <keescook@...omium.org>
To: Fei Li <fei1.li@...el.com>,
	Kees Cook <keescook@...omium.org>
Cc: 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: Re: [PATCH] virt: acrn: Annotate struct vm_memory_region_batch with __counted_by

On Fri, 22 Sep 2023 10:51:02 -0700, Kees Cook wrote:
> 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 vm_memory_region_batch.
> Additionally, since the element count member must be set before accessing
> the annotated flexible array member, move its initialization earlier.
> 
> [...]

Applied to for-next/hardening, thanks!

[1/1] virt: acrn: Annotate struct vm_memory_region_batch with __counted_by
      https://git.kernel.org/kees/c/1a38cf8d8ae7

Take care,

-- 
Kees Cook