linux-kernel - Re: PROBLEM: syzkaller found / pool corruption-overwrite / page in user-area or NULL

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Date:   Thu, 10 Jan 2019 16:03:51 -0500
From:   Qian Cai <cai@....pw>
To:     Esme <esploit@...tonmail.ch>
Cc:     James Bottomley <jejb@...ux.ibm.com>,
        "dgilbert@...erlog.com" <dgilbert@...erlog.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: PROBLEM: syzkaller found / pool corruption-overwrite / page in
 user-area or NULL

On Thu, 2019-01-10 at 20:47 +0000, Esme wrote:
> Sure thing;
> 
> cmdline;
> qemu-system-x86_64 -kernel linux//arch/x86/boot/bzImage -append console=ttyS0
> root=/dev/sda debug earlyprintk=serial slub_debug=QUZ -hda stretch.img -net
> user,hostfwd=tcp::10021-:22 -net nic -enable-kvm -nographic -m 2G -smp 2
> -pidfile
> 
> CONFIG_PAGE*; (full file attached);
> 
> # CONFIG_DEBUG_PAGEALLOC is not set
> CONFIG_PAGE_POISONING=y
> CONFIG_PAGE_POISONING_NO_SANITY=y
> # CONFIG_PAGE_POISONING_ZERO is not set
> # CONFIG_DEBUG_PAGE_REF is not set
> CONFIG_FAIL_PAGE_ALLOC=y

Confused.

https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1896410.html

It said 5.0.0-rc1+

https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1896410/repro.repor
t

It said 4.20.0+, and it also have,

"general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI"

which indicated CONFIG_DEBUG_PAGEALLOC=y but your .config said NO.

However, it looks like a mess that KASAN does not play well with all those
SLUB_DEBUG, CONFIG_DEBUG_PAGEALLOC etc, because it essentially step into each
others' toes by redzoning, poisoning in allocate and free pages.