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From: syzbot <syzbot+5027de09e0964fd78ce1@syzkaller.appspotmail.com>
To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org,
	daniel@iogearbox.net, davem@davemloft.net, hawk@kernel.org,
	john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org,
	kuba@kernel.org, linux-kernel@vger.kernel.org,
	netdev@vger.kernel.org, songliubraving@fb.com,
	syzkaller-bugs@googlegroups.com, yhs@fb.com
Subject: Re: [syzbot] KASAN: vmalloc-out-of-bounds Read in __bpf_prog_put
Date: Tue, 07 Dec 2021 09:36:29 -0800	[thread overview]
Message-ID: <0000000000003d78f805d291d061@google.com> (raw)
In-Reply-To: <000000000000367c2205d2549cb9@google.com>

syzbot has found a reproducer for the following issue on:

HEAD commit:    1c5526968e27 net/smc: Clear memory when release and reuse ..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13a9eabdb00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2b8e24e3a80e3875
dashboard link: https://syzkaller.appspot.com/bug?extid=5027de09e0964fd78ce1
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12b749a9b00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=170d7519b00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5027de09e0964fd78ce1@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: vmalloc-out-of-bounds in __bpf_prog_put.constprop.0+0x1dd/0x220 kernel/bpf/syscall.c:1812
Read of size 8 at addr ffffc90001a16038 by task kworker/0:3/2934

CPU: 0 PID: 2934 Comm: kworker/0:3 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events sk_psock_destroy
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0xf/0x320 mm/kasan/report.c:247
 __kasan_report mm/kasan/report.c:433 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:450
 __bpf_prog_put.constprop.0+0x1dd/0x220 kernel/bpf/syscall.c:1812
 psock_set_prog include/linux/skmsg.h:477 [inline]
 psock_progs_drop include/linux/skmsg.h:495 [inline]
 sk_psock_destroy+0xad/0x620 net/core/skmsg.c:804
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>


Memory state around the buggy address:
 ffffc90001a15f00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc90001a15f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
>ffffc90001a16000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                                        ^
 ffffc90001a16080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc90001a16100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================


  parent reply	other threads:[~2021-12-07 17:36 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-04 16:35 [syzbot] KASAN: vmalloc-out-of-bounds Read in __bpf_prog_put syzbot
2021-12-06 19:02 ` John Fastabend
2021-12-07 17:36 ` syzbot [this message]
2022-01-20 14:17 ` syzbot
2022-01-24 11:42   ` Vegard Nossum
2022-05-19 15:01     ` Dmitry Vyukov

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