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bpfilter: read fail -512 ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3888/0x5140 kernel/locking/lockdep.c:3310 Read of size 8 at addr ffff8801d205ed20 by task syz-executor396/11405 CPU: 0 PID: 11405 Comm: syz-executor396 Not tainted 4.17.0-rc7+ #82 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_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __lock_acquire+0x3888/0x5140 kernel/locking/lockdep.c:3310 lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16d/0x17f0 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 __pipe_lock fs/pipe.c:83 [inline] pipe_read+0xc9/0x940 fs/pipe.c:260 call_read_iter include/linux/fs.h:1778 [inline] new_sync_read fs/read_write.c:406 [inline] __vfs_read+0x696/0xa50 fs/read_write.c:418 vfs_read+0x17f/0x3d0 fs/read_write.c:452 kernel_read+0xab/0x120 fs/read_write.c:431 __bpfilter_process_sockopt+0x238/0x35b net/bpfilter/bpfilter_kern.c:74 bpfilter_mbox_request+0x4d/0xb0 net/ipv4/bpfilter/sockopt.c:25 bpfilter_ip_get_sockopt+0x6b/0x90 net/ipv4/bpfilter/sockopt.c:42 ip_getsockopt+0x238/0x2a0 net/ipv4/ip_sockglue.c:1563 sctp_getsockopt+0x466/0x7b4b net/sctp/socket.c:7216 sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:3018 __sys_getsockopt+0x1a5/0x370 net/socket.c:1940 __do_sys_getsockopt net/socket.c:1951 [inline] __se_sys_getsockopt net/socket.c:1948 [inline] __x64_sys_getsockopt+0xbe/0x150 net/socket.c:1948 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4481d9 RSP: 002b:00007f547ee51ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00000000006dec64 RCX: 00000000004481d9 RDX: 0000000000000043 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 00000000006dec60 R08: 0000000020000040 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe5333e01f R14: 00007f547ee529c0 R15: 0000000000000008 Allocated by task 2200: 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] alloc_pipe_info+0x16d/0x580 fs/pipe.c:633 get_pipe_inode fs/pipe.c:712 [inline] create_pipe_files+0xd0/0x940 fs/pipe.c:745 umh_pipe_setup+0x17b/0x430 kernel/umh.c:442 call_usermodehelper_exec_async+0x3c0/0x9e0 kernel/umh.c:93 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Freed by task 2200: 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 free_pipe_info+0x253/0x300 fs/pipe.c:684 put_pipe_info+0xd0/0xf0 fs/pipe.c:556 pipe_release+0x1de/0x270 fs/pipe.c:577 __fput+0x34d/0x890 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1e4/0x290 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x1aee/0x2730 kernel/exit.c:865 do_group_exit+0x16f/0x430 kernel/exit.c:968 __do_sys_exit_group kernel/exit.c:979 [inline] __se_sys_exit_group kernel/exit.c:977 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:977 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801d205ecc0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 96 bytes inside of 512-byte region [ffff8801d205ecc0, ffff8801d205eec0) The buggy address belongs to the page: page:ffffea0007481780 count:1 mapcount:0 mapping:ffff8801d205e040 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801d205e040 0000000000000000 0000000100000006 raw: ffffea0007353920 ffffea0007351ea0 ffff8801da800940 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d205ec00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801d205ec80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff8801d205ed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d205ed80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d205ee00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2018/06/07 23:29 | net-next-old | 7170e6045a6a | 645e75f8 | .config | console log | report | syz | C | ci-upstream-net-kasan-gce | |||
2018/06/08 07:01 | upstream | 68abbe729567 | f7b27b7a | .config | console log | report | ci-upstream-kasan-gce-386 | |||||
2018/06/09 06:07 | net-next-old | 3a979e8c07e3 | 866118af | .config | console log | report | ci-upstream-net-kasan-gce |