Date:   Sat, 07 Jul 2018 18:29:03 -0700
From:   syzbot <syzbot+43358359519ad16cf05e@...kaller.appspotmail.com>
To:     aviadye@...lanox.com, borisp@...lanox.com, davejwatson@...com,
        davem@...emloft.net, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: KASAN: out-of-bounds Write in tls_push_record

Hello,

syzbot found the following crash on:

HEAD commit:    526674536360 Add linux-next specific files for 20180706
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17e63968400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c8d1cfc0cb798e48
dashboard link: https://syzkaller.appspot.com/bug?extid=43358359519ad16cf05e
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=15790594400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12b53f48400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+43358359519ad16cf05e@...kaller.appspotmail.com

RDX: 00000000fffffdef RSI: 00000000200005c0 RDI: 0000000000000004
RBP: 00000000006cb018 R08: 0000000020000000 R09: 000000000000001c
R10: 0000000000000040 R11: 0000000000000216 R12: 0000000000000005
R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000
==================================================================
BUG: KASAN: out-of-bounds in tls_fill_prepend include/net/tls.h:339 [inline]
BUG: KASAN: out-of-bounds in tls_push_record+0x1091/0x1400  
net/tls/tls_sw.c:239
Write of size 1 at addr ffff8801c07b8000 by task syz-executor985/4467

CPU: 0 PID: 4467 Comm: syz-executor985 Not tainted  
4.18.0-rc3-next-20180706+ #1
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+0x1c9/0x2b4 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+0x242/0x30d mm/kasan/report.c:412
  __asan_report_store1_noabort+0x17/0x20 mm/kasan/report.c:435
  tls_fill_prepend include/net/tls.h:339 [inline]
  tls_push_record+0x1091/0x1400 net/tls/tls_sw.c:239
  tls_sw_push_pending_record+0x22/0x30 net/tls/tls_sw.c:276
  tls_handle_open_record net/tls/tls_main.c:164 [inline]
  tls_sk_proto_close+0x74c/0xae0 net/tls/tls_main.c:264
  inet_release+0x104/0x1f0 net/ipv4/af_inet.c:427
  inet6_release+0x50/0x70 net/ipv6/af_inet6.c:459
  __sock_release+0xd7/0x260 net/socket.c:600
  sock_close+0x19/0x20 net/socket.c:1151
  __fput+0x35d/0x930 fs/file_table.c:215
  ____fput+0x15/0x20 fs/file_table.c:251
  task_work_run+0x1ec/0x2a0 kernel/task_work.c:113
  exit_task_work include/linux/task_work.h:22 [inline]
  do_exit+0x1b08/0x2750 kernel/exit.c:869
  do_group_exit+0x177/0x440 kernel/exit.c:972
  __do_sys_exit_group kernel/exit.c:983 [inline]
  __se_sys_exit_group kernel/exit.c:981 [inline]
  __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:981
  do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x43f358
Code: Bad RIP value.
RSP: 002b:00007ffd4c2414b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f358
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000004bf448 R08: 00000000000000e7 R09: ffffffffffffffd0
R10: 0000000000000040 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea000701ee00 count:0 mapcount:-128 mapping:0000000000000000  
index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 ffffea0006b7be08 ffff88021fffac18 0000000000000000
raw: 0000000000000000 0000000000000003 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8801c07b7f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ffff8801c07b7f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> ffff8801c07b8000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                       ^
  ffff8801c07b8080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ffff8801c07b8100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================


---
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#bug-status-tracking for how to communicate with  
syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

Powered by blists - more mailing lists