linux-kernel - Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request at 0000a7cf

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Message-ID: <20170309224820.5invcnhvr2tl3ges@pd.tnic>
Date:   Thu, 9 Mar 2017 23:48:20 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, Peter Anvin <hpa@...or.com>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Network Development <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, LKP <lkp@...org>,
        ast@...com, the arch/x86 maintainers <x86@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request
 at 0000a7cf

On Thu, Mar 09, 2017 at 11:11:17PM +0100, Daniel Borkmann wrote:
> Yeah, I just tried that out and it had no effect unfortunately, the
> static_cpu_has() was still 1.

Right, just as I thought.

I guess we could return to doing boot_cpu_has() in __flush_tlb_all()
then. I mean, the timing-sensitivity argument is meh - killing global
TLB entries a bit faster doesn't bring me a whole lot when I have to go
and walk pagetable and reestablish them, which is the real price to pay
anyway.

Thanks.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--