Re: KASAN: use-after-free Read in __list_del_entry_valid (4)

From: syzbot
Date: Sun Mar 25 2018 - 23:43:09 EST

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In reply to: syzbot: "KASAN: use-after-free Read in __list_del_entry_valid (4)"
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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@xxxxxxxxxxxxxxxxxxxxxxxxx
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
==================================================================

Next message: Jason Wang: "Re: [RFC PATCH V2 0/8] Packed ring for vhost"
Previous message: Jason Wang: "[RFC PATCH V2 8/8] vhost: event suppression for packed ring"
In reply to: syzbot: "KASAN: use-after-free Read in __list_del_entry_valid (4)"
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