linux-kernel - Re: KASAN: use-after-free Read in __list_del_entry

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <001a1140f6ac1677460568489287@google.com>
Date:   Sun, 25 Mar 2018 20:43:01 -0700
From:   syzbot <syzbot+29ee8f76017ce6cf03da@...kaller.appspotmail.com>
To:     dasaratharaman.chandramouli@...el.com, dledford@...hat.com,
        jgg@...pe.ca, leonro@...lanox.com, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, markb@...lanox.com, monis@...lanox.com,
        parav@...lanox.com, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in __list_del_entry_valid (4)

syzbot has found reproducer for the following crash on upstream commit
3eb2ce825ea1ad89d20f7a3b5780df850e4be274 (Sun Mar 25 22:44:30 2018 +0000)
Linux 4.16-rc7
syzbot dashboard link:  
https://syzkaller.appspot.com/bug?extid=29ee8f76017ce6cf03da

So far this crash happened 4 times on upstream.
C reproducer: https://syzkaller.appspot.com/x/repro.c?id=4763014771245056
syzkaller reproducer:  
https://syzkaller.appspot.com/x/repro.syz?id=5870647779524608
Raw console output:  
https://syzkaller.appspot.com/x/log.txt?id=4652258302099456
Kernel config:  
https://syzkaller.appspot.com/x/.config?id=-2340295454854568752
compiler: gcc (GCC) 7.1.1 20170620

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+29ee8f76017ce6cf03da@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed.

IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready
8021q: adding VLAN 0 to HW filter on device bond0
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0x144/0x150  
lib/list_debug.c:54
Read of size 8 at addr ffff8801b6022fa0 by task syzkaller871713/4346

CPU: 1 PID: 4346 Comm: syzkaller871713 Not tainted 4.16.0-rc7+ #2
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
  print_address_description+0x73/0x250 mm/kasan/report.c:256
  kasan_report_error mm/kasan/report.c:354 [inline]
  kasan_report+0x23c/0x360 mm/kasan/report.c:412
  __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
  __list_del_entry_valid+0x144/0x150 lib/list_debug.c:54
  __list_del_entry include/linux/list.h:117 [inline]
  list_del include/linux/list.h:125 [inline]
  cma_cancel_listens drivers/infiniband/core/cma.c:1569 [inline]
  cma_cancel_operation+0x455/0xd60 drivers/infiniband/core/cma.c:1597
  rdma_destroy_id+0xff/0xda0 drivers/infiniband/core/cma.c:1661
  ucma_close+0x100/0x2f0 drivers/infiniband/core/ucma.c:1728
  __fput+0x327/0x7e0 fs/file_table.c:209
  ____fput+0x15/0x20 fs/file_table.c:243
  task_work_run+0x199/0x270 kernel/task_work.c:113
  exit_task_work include/linux/task_work.h:22 [inline]
  do_exit+0x9bb/0x1ad0 kernel/exit.c:865
  do_group_exit+0x149/0x400 kernel/exit.c:968
  get_signal+0x73a/0x16d0 kernel/signal.c:2469
  do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809
  exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162
  prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
  do_syscall_64+0x6ec/0x940 arch/x86/entry/common.c:292
  entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x447529
RSP: 002b:00007f782c2b0cf8 EFLAGS: 00000202 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00000000006ddc5c RCX: 0000000000447529
RDX: 0000000000447529 RSI: 0000000000000001 RDI: 00000000006ddc5c
RBP: 00000000006ddc58 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007fff8bb3d8cf R14: 00007f782c2b19c0 R15: 0000000000000005

Allocated by task 4343:
  save_stack+0x43/0xd0 mm/kasan/kasan.c:447
  set_track mm/kasan/kasan.c:459 [inline]
  kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552
  kmem_cache_alloc_trace+0x136/0x740 mm/slab.c:3607
  kmalloc include/linux/slab.h:512 [inline]
  kzalloc include/linux/slab.h:701 [inline]
  rdma_create_id+0xd0/0x630 drivers/infiniband/core/cma.c:787
  ucma_create_id+0x35f/0x920 drivers/infiniband/core/ucma.c:480
  ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1649
  __vfs_write+0xef/0x970 fs/read_write.c:480
  vfs_write+0x189/0x510 fs/read_write.c:544
  SYSC_write fs/read_write.c:589 [inline]
  SyS_write+0xef/0x220 fs/read_write.c:581
  do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
  entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 4346:
  save_stack+0x43/0xd0 mm/kasan/kasan.c:447
  set_track mm/kasan/kasan.c:459 [inline]
  __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520
  kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527
  __cache_free mm/slab.c:3485 [inline]
  kfree+0xd9/0x260 mm/slab.c:3800
  rdma_destroy_id+0x821/0xda0 drivers/infiniband/core/cma.c:1691
  ucma_close+0x100/0x2f0 drivers/infiniband/core/ucma.c:1728
  __fput+0x327/0x7e0 fs/file_table.c:209
  ____fput+0x15/0x20 fs/file_table.c:243
  task_work_run+0x199/0x270 kernel/task_work.c:113
  exit_task_work include/linux/task_work.h:22 [inline]
  do_exit+0x9bb/0x1ad0 kernel/exit.c:865
  do_group_exit+0x149/0x400 kernel/exit.c:968
  get_signal+0x73a/0x16d0 kernel/signal.c:2469
  do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809
  exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162
  prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
  do_syscall_64+0x6ec/0x940 arch/x86/entry/common.c:292
  entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff8801b6022dc0
  which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 480 bytes inside of
  1024-byte region [ffff8801b6022dc0, ffff8801b60231c0)
The buggy address belongs to the page:
page:ffffea0006d80880 count:1 mapcount:0 mapping:ffff8801b6022040 index:0x0  
compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801b6022040 0000000000000000 0000000100000007
raw: ffffea0006dca520 ffffea0006d88720 ffff8801dac00ac0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8801b6022e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff8801b6022f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff8801b6022f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                ^
  ffff8801b6023000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff8801b6023080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================