linux-hardening - Re: [syzbot] upstream boot error: WARNING in netlink

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Message-ID: <20221004172334.2cb0233e@kernel.org>
Date:   Tue, 4 Oct 2022 17:23:34 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+3a080099974c271cd7e9@...kaller.appspotmail.com>,
        bpf@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        fw@...len.de, harshit.m.mogalapalli@...cle.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com, syzkaller-bugs@...glegroups.com,
        linux-hardening@...r.kernel.org
Subject: Re: [syzbot] upstream boot error: WARNING in netlink_ack

On Tue, 4 Oct 2022 17:04:00 -0700 Jakub Kicinski wrote:
> > why does a fixed size mean no memset?  
> 
> Copy and paste, it seems to originate from:
> 
> 0c19b0adb8dd ("netlink: avoid memset of 0 bytes sparse warning")
> 
> Any idea why sparse would not like empty memsets?

Google answers is. Let me test if sparse still wants the workaround.