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Date:   Mon, 6 Nov 2023 16:06:49 -0800
From:   Kees Cook <keescook@chromium.org>
To:     "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc:     Kent Overstreet <kent.overstreet@linux.dev>,
        Brian Foster <bfoster@redhat.com>,
        linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-hardening@vger.kernel.org
Subject: Re: [PATCH][next] bcachefs: Fix multiple -Warray-bounds warnings
Message-ID: <202311061606.29DB1C09@keescook>
References: <ZUldRv35EXKHAt3L@work>
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On Mon, Nov 06, 2023 at 03:40:22PM -0600, Gustavo A. R. Silva wrote:
> Transform zero-length array `entries` into a proper flexible-array
> member in `struct journal_seq_blacklist_table`; and fix the following
> -Warray-bounds warnings:
> 
> fs/bcachefs/journal_seq_blacklist.c:148:26: warning: array subscript idx is outside array bounds of 'struct journal_seq_blacklist_table_entry[0]' [-Warray-bounds=]
> fs/bcachefs/journal_seq_blacklist.c:150:30: warning: array subscript idx is outside array bounds of 'struct journal_seq_blacklist_table_entry[0]' [-Warray-bounds=]
> fs/bcachefs/journal_seq_blacklist.c:154:27: warning: array subscript idx is outside array bounds of 'struct journal_seq_blacklist_table_entry[0]' [-Warray-bounds=]
> fs/bcachefs/journal_seq_blacklist.c:176:27: warning: array subscript i is outside array bounds of 'struct journal_seq_blacklist_table_entry[0]' [-Warray-bounds=]
> fs/bcachefs/journal_seq_blacklist.c:177:27: warning: array subscript i is outside array bounds of 'struct journal_seq_blacklist_table_entry[0]' [-Warray-bounds=]
> fs/bcachefs/journal_seq_blacklist.c:297:34: warning: array subscript i is outside array bounds of 'struct journal_seq_blacklist_table_entry[0]' [-Warray-bounds=]
> fs/bcachefs/journal_seq_blacklist.c:298:34: warning: array subscript i is outside array bounds of 'struct journal_seq_blacklist_table_entry[0]' [-Warray-bounds=]
> fs/bcachefs/journal_seq_blacklist.c:300:31: warning: array subscript i is outside array bounds of 'struct journal_seq_blacklist_table_entry[0]' [-Warray-bounds=]
> 
> This results in no differences in binary output.
> 
> This helps with the ongoing efforts to globally enable -Warray-bounds.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Thanks; that looks right to me.

-Kees

-- 
Kees Cook