linux-kernel - KASAN: stack-out-of-bounds Write in notify

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Date:   Sat, 26 May 2018 02:13:01 -0700
From:   syzbot <syzbot+cadaa9a49085b3cc83d3@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, arjan@...ux.intel.com,
        josh@...htriplett.org, linux-kernel@...r.kernel.org,
        mingo@...nel.org, paulmck@...ux.vnet.ibm.com,
        syzkaller-bugs@...glegroups.com
Subject: KASAN: stack-out-of-bounds Write in notify_die

Hello,

syzbot found the following crash on:

HEAD commit:    203ec2fed17a Merge tag 'armsoc-fixes' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14feff97800000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f3b4e30da84ec1ed
dashboard link: https://syzkaller.appspot.com/bug?extid=cadaa9a49085b3cc83d3
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+cadaa9a49085b3cc83d3@...kaller.appspotmail.com

==================================================================
BUG: KASAN: stack-out-of-bounds in notify_die+0x291/0x2b0  
kernel/notifier.c:539
Write of size 8 at addr ffff8801c74d7258 by task syz-executor7/17787

CPU: 1 PID: 17787 Comm: syz-executor7 Not tainted 4.17.0-rc5+ #60
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x1b9/0x294 lib/dump_stack.c:113
  print_address_description+0x6c/0x20b mm/kasan/report.c:256
  kasan_report_error mm/kasan/report.c:354 [inline]
  kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
  __asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:438
  notify_die+0x291/0x2b0 kernel/notifier.c:539
  do_general_protection+0x248/0x2f0 arch/x86/kernel/traps.c:558
  general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1159
RIP: 0010:msr_write_intercepted arch/x86/kvm/vmx.c:2132 [inline]
RIP: 0010:vmx_vcpu_run+0xa2f/0x25f0 arch/x86/kvm/vmx.c:9871
RSP: 0018:ffff8801c74d73b0 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000010000000 RCX: ffffffff811f778f
RDX: 000000000836b156 RSI: ffffffff811f779c RDI: 0000000000000005
RBP: ffff8801c74d7898 R08: ffff8801ab74e140 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea00071d35c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 ffffea00071d0101 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8801c74d7100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  ffff8801c74d7180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ffff8801c74d7200: 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f3 f3
                                                     ^
  ffff8801c74d7280: f3 f3 00 f2 f2 f2 f2 f2 f2 f2 00 00 f2 f2 f3 f3
  ffff8801c74d7300: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================


---
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