linux-kernel - Re: [PATCH][next] udf: Fix undefined behavior bug in struct udf_fileident

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Message-ID: <202310021038.9F85D987AE@keescook>
Date:   Mon, 2 Oct 2023 10:38:11 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Jan Kara <jack@...e.com>, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] udf: Fix undefined behavior bug in struct
 udf_fileident_iter

On Mon, Oct 02, 2023 at 06:14:26PM +0200, Gustavo A. R. Silva wrote:
> `struct fileIdentDesc` is a flexible structure, which means that it
> contains a flexible-array member at the bottom. This could potentially
> lead to an overwrite of the objects following `fi` in `struct
> udf_fileident_iter` at run-time.
> 
> Fix this by placing the declaration of object `fi` at the end of
> `struct udf_fileident_iter`.
> 
> -Wflex-array-member-not-at-end is coming in GCC-14, and we are getting
> ready to enable it globally.
> 
> Fixes: d16076d9b684 ("udf: New directory iteration code")
> Cc: stable@...r.kernel.org
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Looks right.

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook