linux-kernel - Re: [PATCH] ima: Add __counted_by for struct modsig and use struct

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Message-Id: <169818232961.2100071.16281003220296579350.b4-ty@chromium.org>
Date:   Tue, 24 Oct 2023 14:18:48 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Mimi Zohar <zohar@...ux.ibm.com>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        Paul Moore <paul@...l-moore.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
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()
      https://git.kernel.org/kees/c/68a8f644575b

Take care,

-- 
Kees Cook