linux-kernel - Re: tip -ENOBOOT - bisected to locking/refcounts, x86/asm: Implement fast refcount overflow protection

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Message-ID: <CAGXu5jJim=r8b+y1qQXtuzm9fPyv1tp9ANebxbCc9ic2c83_Mg@mail.gmail.com>
Date:   Wed, 30 Aug 2017 09:35:14 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Mike Galbraith <efault@....de>
Cc:     LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
        "Reshetova, Elena" <elena.reshetova@...el.com>
Subject: Re: tip -ENOBOOT - bisected to locking/refcounts, x86/asm: Implement
 fast refcount overflow protection

On Tue, Aug 29, 2017 at 10:02 PM, Mike Galbraith <efault@....de> wrote:
> On Tue, 2017-08-29 at 11:41 -0700, Kees Cook wrote:
>> Can you also test with 14afee4b6092 ("net: convert sock.sk_wmem_alloc
>> from atomic_t to refcount_t") reverted (instead of ARCH_HAS_REFCOUNT
>> disabled)?
>
> Nogo.

Thanks for checking!

> [   44.901930] WARNING: CPU: 5 PID: 0 at net/netlink/af_netlink.c:374 netlink_sock_destruct+0x82/0xa0

This is so odd if 14afee4b6092 is reverted. What is line 374 for you
in net/netlink/af_netlink.c?

-Kees

-- 
Kees Cook
Pixel Security