linux-hardening - Re: [PATCH] fs/affs: struct affs_head: Replace 1-element array with flexible array

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Message-ID: <1f3ad235-b2c7-47e8-bf70-b910d397d690@embeddedor.com>
Date: Wed, 10 Jul 2024 17:26:11 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <kees@...nel.org>, David Sterba <dsterba@...e.com>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH] fs/affs: struct affs_head: Replace 1-element array with
 flexible array



On 10/07/24 16:57, Kees Cook wrote:
> AFFS uses struct affs_head's "table" array as a flexible array. Switch
> this to a proper flexible array[1]. There are no sizeof() uses; struct
> affs_head is only ever uses via direct casts. No binary output
> differences were found after this change.
> 
> Link: https://github.com/KSPP/linux/issues/79 [1]
> Signed-off-by: Kees Cook <kees@...nel.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks
-- 
Gustavo

> ---
> Cc: David Sterba <dsterba@...e.com>
> Cc: linux-fsdevel@...r.kernel.org
> ---
>   fs/affs/amigaffs.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/affs/amigaffs.h b/fs/affs/amigaffs.h
> index 5509fbc98bc0..09dc23a644df 100644
> --- a/fs/affs/amigaffs.h
> +++ b/fs/affs/amigaffs.h
> @@ -80,7 +80,7 @@ struct affs_head {
>   	__be32 spare1;
>   	__be32 first_data;
>   	__be32 checksum;
> -	__be32 table[1];
> +	__be32 table[];
>   };
>   
>   struct affs_tail {