linux-kernel - Re: [syzbot] WARNING in __change_page_attr_set

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Date:   Mon, 26 Sep 2022 10:20:52 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        tech-board@...ts.linuxfoundation.org,
        Song Liu <songliubraving@...com>,
        Kernel Team <Kernel-team@...com>,
        Borislav Petkov <bp@...en8.de>, brijesh.singh@....com,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, jane.chu@...cle.com,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, seanjc@...gle.com,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        X86 ML <x86@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        "open list:BPF (Safe dynamic programs and tools)" 
        <bpf@...r.kernel.org>
Subject: Re: [syzbot] WARNING in __change_page_attr_set_clr

On Sun, Sep 25, 2022 at 02:55:46PM -0700, Alexei Starovoitov wrote:

> Steven Rostedt noticed that comment around the middle of August
> and told you and Peter about it.

He did indeed; and I was thinking he'd told you about it too so you
could fix, what is a very juicy security issue, ASAP.

> Then Peter added a WARN_ONCE in commit
> https://lore.kernel.org/all/YwySW3ROc21hN7g9@hirez.programming.kicks-ass.net/
> to explicitly trigger that known issue.

Well, I had sincerely hoped you'd fixed it by now. You just don't let
things like that slide. Note how I didn't post that mostly trivial patch
in mid August. Giving you ample time to fix up.

> Now we're trying to urgently address it with:
> https://lore.kernel.org/bpf/20220923211837.3044723-1-song@kernel.org/

Glad to see it being fixed. Thanks!