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Date: Tue, 24 Oct 2023 14:18:48 -0700
From: Kees Cook <>
To: Mimi Zohar <>,
	Dmitry Kasatkin <>,
	Paul Moore <>,
	James Morris <>,
	"Serge E. Hallyn" <>,
	"Gustavo A. R. Silva" <>
Cc: Kees Cook <>,,,,
Subject: Re: [PATCH] ima: Add __counted_by for struct modsig and use struct_size()

On Mon, 09 Oct 2023 13:52:45 -0600, Gustavo A. R. Silva 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 via CONFIG_UBSAN_BOUNDS (for
> array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
> Also, relocate `hdr->raw_pkcs7_len = sig_len;` so that the __counted_by
> annotation has effect, and flex-array member `raw_pkcs7` can be properly
> bounds-checked at run-time.
> [...]

Applied to for-next/hardening, thanks!

[1/1] ima: Add __counted_by for struct modsig and use struct_size()

Take care,

Kees Cook

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