linux-kernel - Re: [PATCH 1/2] btrfs: avoid Wmaybe-uninitialized warnings

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230710165506.GA30916@twin.jikos.cz>
Date:   Mon, 10 Jul 2023 18:55:06 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, Arnd Bergmann <arnd@...db.de>,
        Johannes Thumshirn <johannes.thumshirn@....com>,
        Anand Jain <anand.jain@...cle.com>,
        Filipe Manana <fdmanana@...e.com>, Qu Wenruo <wqu@...e.com>,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] btrfs: avoid Wmaybe-uninitialized warnings

On Wed, Jul 05, 2023 at 04:01:08PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The -Wmaybe-uninitialized warning option in gcc produces tons of false
> positive warnings when KASAN is enabled, as that turns off some required
> optimizations.

Which version of gcc produces the warnings? I have KASAN enabled and
don't see any warnings, with gcc 13. Making the warning conditional
would effectively turn it off for me which means I can't catch the
warnings early. We do get reports from various build bots with
various arch/compiler combinations and fix the warnings.

If there's a know minimum compiler version where there are no reports
(or reasonably small nubmer to fix) then I'd rather make the condition
bassed on that, neither on KASAN nor any similar feature for that matter.