linux-hardening - Re: [PATCH] ocfs2: Annotate struct ocfs2_replay_map with __counted

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Date: Mon, 25 Sep 2023 10:22:31 +0800
From: Joseph Qi <joseph.qi@...ux.alibaba.com>
To: Kees Cook <keescook@...omium.org>, Mark Fasheh <mark@...heh.com>,
 akpm <akpm@...ux-foundation.org>
Cc: Joel Becker <jlbec@...lplan.org>, Nathan Chancellor <nathan@...nel.org>,
 Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>,
 ocfs2-devel@...ts.linux.dev, llvm@...ts.linux.dev,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] ocfs2: Annotate struct ocfs2_replay_map with __counted_by



On 9/23/23 1:49 AM, 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 ocfs2_replay_map.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Mark Fasheh <mark@...heh.com>
> Cc: Joel Becker <jlbec@...lplan.org>
> Cc: Joseph Qi <joseph.qi@...ux.alibaba.com>
> Cc: Nathan Chancellor <nathan@...nel.org>
> Cc: Nick Desaulniers <ndesaulniers@...gle.com>
> Cc: Tom Rix <trix@...hat.com>
> Cc: ocfs2-devel@...ts.linux.dev
> Cc: llvm@...ts.linux.dev
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Joseph Qi <joseph.qi@...ux.alibaba.com>
> ---
>  fs/ocfs2/journal.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
> index ce215565d061..604fea3a26ff 100644
> --- a/fs/ocfs2/journal.c
> +++ b/fs/ocfs2/journal.c
> @@ -90,7 +90,7 @@ enum ocfs2_replay_state {
>  struct ocfs2_replay_map {
>  	unsigned int rm_slots;
>  	enum ocfs2_replay_state rm_state;
> -	unsigned char rm_replay_slots[];
> +	unsigned char rm_replay_slots[] __counted_by(rm_slots);
>  };
>  
>  static void ocfs2_replay_map_set_state(struct ocfs2_super *osb, int state)