Messages in this thread | | | Date | Sun, 15 Apr 2018 22:57:01 -0700 | Subject | KASAN: use-after-free Read in tipc_nametbl_stop | From | syzbot <> |
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Hello,
syzbot hit the following crash on net-next commit 5d1365940a68dd57b031b6e3c07d7d451cd69daf (Thu Apr 12 18:09:05 2018 +0000) Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=d64b64afc55660106556
So far this crash happened 5 times on net-next, upstream. C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6319968803094528 syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=6099825221173248 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=4953018151731200 Kernel config: https://syzkaller.appspot.com/x/.config?id=-5947642240294114534 compiler: gcc (GCC) 8.0.1 20180413 (experimental)
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+d64b64afc55660106556@syzkaller.appspotmail.com It will help syzbot understand when the bug is fixed. See footer for details. If you forward the report, please keep this part and the footer.
Failed to remove local publication {0,0,0}/206417777 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KASAN: use-after-free in tipc_service_delete net/tipc/name_table.c:751 [inline] BUG: KASAN: use-after-free in tipc_nametbl_stop+0x94e/0xd70 net/tipc/name_table.c:780 Read of size 8 at addr ffff8801c4c25130 by task kworker/u4:2/30
CPU: 0 PID: 30 Comm: kworker/u4:2 Not tainted 4.16.0+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net 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_load8_noabort+0x14/0x20 mm/kasan/report.c:433 tipc_service_delete net/tipc/name_table.c:751 [inline] tipc_nametbl_stop+0x94e/0xd70 net/tipc/name_table.c:780 tipc_exit_net+0x2d/0x40 net/tipc/core.c:103 ops_exit_list.isra.7+0xb0/0x160 net/core/net_namespace.c:152 cleanup_net+0x51d/0xb20 net/core/net_namespace.c:523 process_one_work+0xc1e/0x1b50 kernel/workqueue.c:2145 worker_thread+0x1cc/0x1440 kernel/workqueue.c:2279 kthread+0x345/0x410 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:411
Allocated by task 4535: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620 kmalloc include/linux/slab.h:512 [inline] kzalloc include/linux/slab.h:701 [inline] tipc_service_create_range net/tipc/name_table.c:183 [inline] tipc_service_insert_publ net/tipc/name_table.c:207 [inline] tipc_nametbl_insert_publ+0x569/0x1910 net/tipc/name_table.c:371 tipc_nametbl_publish+0x6c3/0xba0 net/tipc/name_table.c:618 tipc_sk_publish+0x22a/0x510 net/tipc/socket.c:2604 tipc_bind+0x206/0x330 net/tipc/socket.c:647 __sys_bind+0x331/0x440 net/socket.c:1484 SYSC_bind net/socket.c:1495 [inline] SyS_bind+0x24/0x30 net/socket.c:1493 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7
Freed by task 30: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 tipc_service_remove_publ.isra.8+0x909/0xc30 net/tipc/name_table.c:283 tipc_service_delete net/tipc/name_table.c:753 [inline] tipc_nametbl_stop+0x746/0xd70 net/tipc/name_table.c:780 tipc_exit_net+0x2d/0x40 net/tipc/core.c:103 ops_exit_list.isra.7+0xb0/0x160 net/core/net_namespace.c:152 cleanup_net+0x51d/0xb20 net/core/net_namespace.c:523 process_one_work+0xc1e/0x1b50 kernel/workqueue.c:2145 worker_thread+0x1cc/0x1440 kernel/workqueue.c:2279 kthread+0x345/0x410 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:411
The buggy address belongs to the object at ffff8801c4c25100 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes inside of 64-byte region [ffff8801c4c25100, ffff8801c4c25140) The buggy address belongs to the page: page:ffffea0007130940 count:1 mapcount:0 mapping:ffff8801c4c25000 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801c4c25000 0000000000000000 0000000100000020 raw: ffffea0006ccf860 ffffea00070840a0 ffff8801dac00340 0000000000000000 page dumped because: kasan: bad access detected
Memory state around the buggy address: ffff8801c4c25000: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801c4c25080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ffff8801c4c25100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8801c4c25180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801c4c25200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================
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