IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KASAN: stack-out-of-bounds in user_mode arch/x86/include/asm/ptrace.h:131 [inline] BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x10a0/0x1400 arch/x86/kernel/unwind_orc.c:410 Read of size 8 at addr ffff888181917610 by task syz-executor.3/21032 CPU: 1 PID: 21032 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 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+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 user_mode arch/x86/include/asm/ptrace.h:131 [inline] unwind_next_frame+0x10a0/0x1400 arch/x86/kernel/unwind_orc.c:410 perf_callchain_kernel+0x3fa/0x5c0 arch/x86/events/core.c:2346 get_perf_callchain+0x392/0x860 kernel/events/callchain.c:202 perf_callchain+0x165/0x1c0 kernel/events/core.c:6474 perf_prepare_sample+0x81e/0x1620 kernel/events/core.c:6501 __perf_event_output kernel/events/core.c:6616 [inline] perf_event_output_forward+0xf3/0x270 kernel/events/core.c:6634 __perf_event_overflow+0x13c/0x370 kernel/events/core.c:7907 perf_swevent_hrtimer+0x272/0x3e0 kernel/events/core.c:9261 __run_hrtimer kernel/time/hrtimer.c:1465 [inline] __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1527 hrtimer_interrupt+0x326/0x9e0 kernel/time/hrtimer.c:1585 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:784 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:806 [inline] RIP: 0010:lock_acquire+0x97/0x3c0 kernel/locking/lockdep.c:3903 Code: 82 f1 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 eb 02 00 00 48 83 3d 50 2f a6 08 00 0f 84 75 02 00 00 9c <58> 0f 1f 44 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 44 24 08 48 RSP: 0018:ffff888181917500 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3050 RBX: ffff888200e42480 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff888200e42d04 RBP: ffffffff8a070900 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 00000000b501dfba R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 kernfs_activate+0x2c/0x1d0 fs/kernfs/dir.c:1258 retint_kernel+0x2d/0x2d RIP: 0010:lock_release+0x45e/0x8b0 kernel/locking/lockdep.c:3931 Code: 00 fc ff df 49 c7 04 04 00 00 00 00 48 8b 44 24 70 65 48 2b 04 25 28 00 00 00 0f 85 67 03 00 00 48 83 c4 78 5b 5d 41 5c 41 5d <41> 5e 41 5f c3 65 8b 05 d6 32 b6 7e 83 f8 07 0f 87 ba 02 00 00 89 RSP: e42480:ffff888181917630 EFLAGS: 00000292 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000041b58ab3 RCX: 1ffff110401c85ab RDX: dffffc0000000000 RSI: 0000000000000003 RDI: 0000000000000286 RBP: ffffffff81c4962c R08: 0000000000000000 R09: 0000000000000002 R10: ffffffff88188780 R11: ffffffff89b72700 R12: ffffffff8a070900 R13: ffff8880a00a60e0 R14: ffff888200e42480 R15: 1ffff11030322eb6 atomic64_cmpxchg include/asm-generic/atomic-instrumented.h:63 [inline] __mutex_unlock_slowpath+0xea/0x610 kernel/locking/mutex.c:1224 kernfs_add_one+0x36a/0x4c0 fs/kernfs/dir.c:811 __kernfs_create_file+0x293/0x340 fs/kernfs/file.c:1021 sysfs_add_file_mode_ns+0x226/0x540 fs/sysfs/file.c:307 create_files fs/sysfs/group.c:63 [inline] internal_create_group+0x355/0xb20 fs/sysfs/group.c:147 sysfs_create_group fs/sysfs/group.c:173 [inline] sysfs_create_groups fs/sysfs/group.c:200 [inline] sysfs_create_groups+0x98/0x140 fs/sysfs/group.c:190 device_add_groups drivers/base/core.c:1301 [inline] device_add_attrs drivers/base/core.c:1460 [inline] device_add+0x12ba/0x16d0 drivers/base/core.c:2139 netdev_register_kobject+0x181/0x430 net/core/net-sysfs.c:1806 register_netdevice+0xb46/0x10f0 net/core/dev.c:8730 __ip_tunnel_create+0x398/0x580 net/ipv4/ip_tunnel.c:280 ip_tunnel_init_net+0x330/0x990 net/ipv4/ip_tunnel.c:1035 ops_init+0xb3/0x410 net/core/net_namespace.c:129 setup_net+0x2c2/0x720 net/core/net_namespace.c:316 copy_net_ns+0x1f7/0x340 net/core/net_namespace.c:439 create_new_namespaces+0x3f6/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:206 ksys_unshare+0x36c/0x9a0 kernel/fork.c:2542 __do_sys_unshare kernel/fork.c:2610 [inline] __se_sys_unshare kernel/fork.c:2608 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:2608 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f6592447ae9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f658f9bd188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f659255af60 RCX: 00007f6592447ae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 00007f65924a1f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff956736bf R14: 00007f658f9bd300 R15: 0000000000022000 The buggy address belongs to the page: page:ffffea00060645c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x57ff00000000000() raw: 057ff00000000000 0000000000000000 ffffffff06070101 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888181917500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888181917580: 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 f2 00 00 >ffff888181917600: 00 f2 f2 f2 00 00 00 00 00 f3 f3 f3 f3 f3 00 00 ^ ffff888181917680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888181917700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess), 3 bytes skipped: 0: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 7: fc ff df a: 48 c1 e8 03 shr $0x3,%rax e: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) 12: 0f 85 eb 02 00 00 jne 0x303 18: 48 83 3d 50 2f a6 08 cmpq $0x0,0x8a62f50(%rip) # 0x8a62f70 1f: 00 20: 0f 84 75 02 00 00 je 0x29b 26: 9c pushfq * 27: 58 pop %rax <-- trapping instruction 28: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 2d: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 34: fc ff df 37: 48 89 44 24 08 mov %rax,0x8(%rsp) 3c: 48 rex.W