linux-kernel - KASAN: vmalloc-out-of-bounds Read in srcu_invoke

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Date:   Mon, 23 Dec 2019 06:45:10 -0800
From:   syzbot <syzbot+e8574d6a7b2172d6d2a6@...kaller.appspotmail.com>
To:     jmattson@...gle.com, junaids@...gle.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, pbonzini@...hat.com,
        rkrcmar@...hat.com, syzkaller-bugs@...glegroups.com
Subject: KASAN: vmalloc-out-of-bounds Read in srcu_invoke_callbacks

Hello,

syzbot found the following crash on:

HEAD commit:    6398b9fc Merge tag 'char-misc-5.5-rc3' of git://git.kernel..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=140da2b9e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1b59a3066828ac4c
dashboard link: https://syzkaller.appspot.com/bug?extid=e8574d6a7b2172d6d2a6
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=152f4a49e00000

The bug was bisected to:

commit 9121923c457d1d8667a6e3a67302c29e5c5add6b
Author: Jim Mattson <jmattson@...gle.com>
Date:   Thu Oct 24 23:03:26 2019 +0000

     kvm: Allocate memslots and buses before calling kvm_arch_init_vm

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15bf9ac1e00000
final crash:    https://syzkaller.appspot.com/x/report.txt?x=17bf9ac1e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=13bf9ac1e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+e8574d6a7b2172d6d2a6@...kaller.appspotmail.com
Fixes: 9121923c457d ("kvm: Allocate memslots and buses before calling  
kvm_arch_init_vm")

==================================================================
BUG: KASAN: vmalloc-out-of-bounds in __read_once_size  
include/linux/compiler.h:199 [inline]
BUG: KASAN: vmalloc-out-of-bounds in rcu_seq_current kernel/rcu/rcu.h:99  
[inline]
BUG: KASAN: vmalloc-out-of-bounds in srcu_invoke_callbacks+0x338/0x360  
kernel/rcu/srcutree.c:1169
Read of size 8 at addr ffffc90004c18c78 by task kworker/0:2/9307

CPU: 0 PID: 9307 Comm: kworker/0:2 Not tainted 5.5.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: rcu_gp srcu_invoke_callbacks
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x197/0x210 lib/dump_stack.c:118
  print_address_description.constprop.0.cold+0x5/0x30b mm/kasan/report.c:374
  __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
  kasan_report+0x12/0x20 mm/kasan/common.c:639
  __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
  __read_once_size include/linux/compiler.h:199 [inline]
  rcu_seq_current kernel/rcu/rcu.h:99 [inline]
  srcu_invoke_callbacks+0x338/0x360 kernel/rcu/srcutree.c:1169
  process_one_work+0x9af/0x1740 kernel/workqueue.c:2264
  worker_thread+0x98/0xe40 kernel/workqueue.c:2410
  kthread+0x361/0x430 kernel/kthread.c:255
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352


Memory state around the buggy address:
  ffffc90004c18b00: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  ffffc90004c18b80: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
> ffffc90004c18c00: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
                                                                 ^
  ffffc90004c18c80: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  ffffc90004c18d00: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
==================================================================


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches