linux-kernel - Re: WARNING in kmalloc

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Message-ID: <CACT4Y+YGiXWOCZ3VMWdwJ9N4YAMv5-+dZ5c75VWtK_8GXf=mPg@mail.gmail.com>
Date:   Tue, 13 Mar 2018 11:04:18 +0300
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Steffen Klassert <steffen.klassert@...unet.com>
Cc:     syzbot <syzbot+6a7e7ed886bde43469c4@...kaller.appspotmail.com>,
        David Miller <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>, syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in kmalloc_slab (4)

On Tue, Mar 13, 2018 at 10:51 AM, Steffen Klassert
<steffen.klassert@...unet.com> wrote:
> On Tue, Mar 13, 2018 at 12:33:02AM -0700, syzbot wrote:
>> Hello,
>>
>> syzbot hit the following crash on net-next commit
>> f44b1886a5f876c87b5889df463ad7b97834ba37 (Fri Mar 9 18:10:06 2018 +0000)
>> Merge branch 's390-qeth-next'
>>
>> Unfortunately, I don't have any reproducer for this crash yet.
>> Raw console output is attached.
>> compiler: gcc (GCC) 7.1.1 20170620
>> .config is attached.
>>
>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> Reported-by: syzbot+6a7e7ed886bde43469c4@...kaller.appspotmail.com
>> It will help syzbot understand when the bug is fixed. See footer for
>> details.
>> If you forward the report, please keep this part and the footer.
>>
>> WARNING: CPU: 1 PID: 27333 at mm/slab_common.c:1012 kmalloc_slab+0x5d/0x70
>> mm/slab_common.c:1012
>> Kernel panic - not syncing: panic_on_warn set ...
>>
>> syz-executor0: vmalloc: allocation failure: 17045651456 bytes,
>> mode:0x14080c0(GFP_KERNEL|__GFP_ZERO), nodemask=(null)
>> CPU: 1 PID: 27333 Comm: syz-executor2 Not tainted 4.16.0-rc4+ #260
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> Google 01/01/2011
>> Call Trace:
>>  __dump_stack lib/dump_stack.c:17 [inline]
>>  dump_stack+0x194/0x24d lib/dump_stack.c:53
>>  panic+0x1e4/0x41c kernel/panic.c:183
>> syz-executor0 cpuset=
>>  __warn+0x1dc/0x200 kernel/panic.c:547
>> /
>>  mems_allowed=0
>>  report_bug+0x211/0x2d0 lib/bug.c:184
>>  fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
>>  fixup_bug arch/x86/kernel/traps.c:247 [inline]
>>  do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
>>  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
>>  invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986
>> RIP: 0010:kmalloc_slab+0x5d/0x70 mm/slab_common.c:1012
>> RSP: 0018:ffff8801ccfc72f0 EFLAGS: 00010246
>> RAX: 0000000000000000 RBX: 0000000010000018 RCX: ffffffff84ec4fc8
>> RDX: 0000000000000ba7 RSI: 0000000000000000 RDI: 0000000010000018
>> RBP: ffff8801ccfc72f0 R08: 0000000000000000 R09: 1ffff100399f8e21
>> R10: ffff8801ccfc7040 R11: 0000000000000001 R12: 0000000000000018
>> R13: ffff8801ccfc7598 R14: 00000000014080c0 R15: ffff8801aebaad80
>>  __do_kmalloc mm/slab.c:3700 [inline]
>>  __kmalloc+0x25/0x760 mm/slab.c:3714
>>  kmalloc include/linux/slab.h:517 [inline]
>>  kzalloc include/linux/slab.h:701 [inline]
>>  xfrm_alloc_replay_state_esn net/xfrm/xfrm_user.c:442 [inline]
>
> This is likely fixed with:
>
> commit d97ca5d714a5334aecadadf696875da40f1fbf3e
> xfrm_user: uncoditionally validate esn replay attribute struct
>
> The patch is included in the ipsec pull request for the net
> tree I've sent this morning.

Let's tell syzbot:

#syz fix: xfrm_user: uncoditionally validate esn replay attribute struct