SELinux: unrecognized netlink message: protocol=0 nlmsg_type=5044 sclass=netlink_route_socket ================================================================== BUG: KASAN: use-after-free in pppol2tp_connect+0x160a/0x1910 net/l2tp/l2tp_ppp.c:735 Read of size 8 at addr ffff8801d7182e10 by task syz-executor3/18848 CPU: 0 PID: 18848 Comm: syz-executor3 Not tainted 4.4.145-g2241aa9 #78 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 1b8231d00474f6fd ffff8800a16e7b28 ffffffff81e123cd ffffea00075c6080 ffff8801d7182e10 0000000000000000 ffff8801d7182e10 ffff8800a16e7d50 ffff8800a16e7b60 ffffffff81517d66 ffff8801d7182e10 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x124 lib/dump_stack.c:51 [] print_address_description+0x6c/0x216 mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429 [] pppol2tp_connect+0x160a/0x1910 net/l2tp/l2tp_ppp.c:735 [] SYSC_connect+0x1b8/0x300 net/socket.c:1557 [] SyS_connect+0x24/0x30 net/socket.c:1538 [] entry_SYSCALL_64_fastpath+0x22/0x9e Allocated by task 18848: [] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [] save_stack+0x43/0xd0 mm/kasan/kasan.c:512 [] set_track mm/kasan/kasan.c:524 [inline] [] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616 [] __kmalloc+0x124/0x310 mm/slub.c:3613 [] kmalloc include/linux/slab.h:481 [inline] [] kzalloc include/linux/slab.h:620 [inline] [] l2tp_session_create+0x39/0x1030 net/l2tp/l2tp_core.c:1748 [] pppol2tp_connect+0x10f0/0x1910 net/l2tp/l2tp_ppp.c:725 [] SYSC_connect+0x1b8/0x300 net/socket.c:1557 [] SyS_connect+0x24/0x30 net/socket.c:1538 [] entry_SYSCALL_64_fastpath+0x22/0x9e Freed by task 18843: [] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [] save_stack+0x43/0xd0 mm/kasan/kasan.c:512 [] set_track mm/kasan/kasan.c:524 [inline] [] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589 [] slab_free_hook mm/slub.c:1383 [inline] [] slab_free_freelist_hook mm/slub.c:1405 [inline] [] slab_free mm/slub.c:2859 [inline] [] kfree+0xf4/0x310 mm/slub.c:3749 [] l2tp_session_free+0x170/0x200 net/l2tp/l2tp_core.c:1676 [] l2tp_session_dec_refcount_1 net/l2tp/l2tp_core.h:293 [inline] [] pppol2tp_session_destruct+0xd7/0x110 net/l2tp/l2tp_ppp.c:477 [] sk_destruct+0x4c/0x4c0 net/core/sock.c:1447 [] __sk_free+0x4f/0x220 net/core/sock.c:1480 [] sk_free+0x30/0x40 net/core/sock.c:1491 [] sock_put include/net/sock.h:1639 [inline] [] pppol2tp_release+0x26a/0x310 net/l2tp/l2tp_ppp.c:518 [] sock_release+0x96/0x1c0 net/socket.c:586 [] sock_close+0x16/0x20 net/socket.c:1037 [] __fput+0x235/0x6f0 fs/file_table.c:208 [] ____fput+0x15/0x20 fs/file_table.c:244 [] task_work_run+0x10f/0x190 kernel/task_work.c:115 [] tracehook_notify_resume include/linux/tracehook.h:191 [inline] [] exit_to_usermode_loop+0x13d/0x160 arch/x86/entry/common.c:253 [] prepare_exit_to_usermode arch/x86/entry/common.c:284 [inline] [] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:349 [] int_ret_from_sys_call+0x25/0xa3 The buggy address belongs to the object at ffff8801d7182c80 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 400 bytes inside of 512-byte region [ffff8801d7182c80, ffff8801d7182e80) The buggy address belongs to the page: BUG: unable to handle kernel paging request at fffffffb8ee8fc78 IP: [] cpuacct_charge+0x155/0x380 kernel/sched/cpuacct.c:247 PGD 440f067 PUD 0 Oops: 0000 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 2026 Comm: udevd Not tainted 4.4.145-g2241aa9 #78 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d31a9800 task.stack: ffff8801d3188000 RIP: 0010:[] [] cpuacct_charge+0x155/0x380 kernel/sched/cpuacct.c:247 RSP: 0000:ffff8801d318f600 EFLAGS: 00010046 RAX: 1ffffffff089521f RBX: 00000000000185a8 RCX: ffffffff84a16640 RDX: fffffbff71dd1f8f RSI: fffffffb8ee8fc78 RDI: ffffffff844a90f8 RBP: ffff8801d318f640 R08: ffff8801d31aa1f0 R09: 0000000000000001 R10: 0000000000000001 R11: ffff8801d31a9800 R12: ffffffff844a9020 R13: dffffc0000000000 R14: 0000000006d559b0 R15: ffffffff8148f2c7 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffb8ee8fc78 CR3: 000000000440c000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff81226e50 0000000000000046 0000000000000003 ffff8801cef63060 ffff8801cef63000 0000000006d559b0 ffff8801cef630b0 0000000000000000 ffff8801d318f688 ffffffff811db4c9 0000000000000005 ffff8801db21f558 Call Trace: [] update_curr+0x2c9/0x6d0 kernel/sched/fair.c:882 [] enqueue_entity kernel/sched/fair.c:3512 [inline] [] enqueue_task_fair+0x2fa/0x2790 kernel/sched/fair.c:4695 [] enqueue_task kernel/sched/core.c:858 [inline] [] activate_task+0x14d/0x280 kernel/sched/core.c:874 [] ttwu_activate kernel/sched/core.c:1736 [inline] [] ttwu_do_activate.constprop.109+0xbf/0x1e0 kernel/sched/core.c:1789 [] ttwu_queue kernel/sched/core.c:1934 [inline] [] try_to_wake_up+0x660/0xf00 kernel/sched/core.c:2068 [] default_wake_function+0x35/0x50 kernel/sched/core.c:3494 [] __wake_up_common+0xb6/0x150 kernel/sched/wait.c:73 [] __wake_up_locked+0xe/0x10 kernel/sched/wait.c:105 [] ep_poll_callback+0x173/0x5b0 fs/eventpoll.c:1065 [] __wake_up_common+0xb6/0x150 kernel/sched/wait.c:73 [] __wake_up+0x34/0x50 kernel/sched/wait.c:95 [] signalfd_notify include/linux/signalfd.h:21 [inline] [] __send_signal+0xf40/0x11b0 kernel/signal.c:1078 [] send_signal+0x4a/0xc0 kernel/signal.c:1096 [] do_send_sig_info+0xa4/0x130 kernel/signal.c:1151 [] group_send_sig_info+0xf6/0x170 kernel/signal.c:1273 [] forget_original_parent kernel/exit.c:575 [inline] [] exit_notify kernel/exit.c:599 [inline] [] do_exit+0x1105/0x26b0 kernel/exit.c:776 [] do_group_exit+0x111/0x330 kernel/exit.c:885 [] get_signal+0x4ec/0x14b0 kernel/signal.c:2321 [] do_signal+0x8b/0x1d30 arch/x86/kernel/signal.c:712 [] exit_to_usermode_loop+0x11a/0x160 arch/x86/entry/common.c:249 [] prepare_exit_to_usermode+0xe3/0x100 arch/x86/entry/common.c:284 [] retint_user+0x8/0x3c Code: 49 8d bc 24 d8 00 00 00 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 c4 01 00 00 49 8b 9c 24 d8 00 00 00 80 3a 00 0f 85 8f 01 00 00 <4a> 03 1c f9 48 89 d8 48 c1 e8 03 42 80 3c 28 00 0f 85 be 01 00 RIP [] cpuacct_charge+0x155/0x380 kernel/sched/cpuacct.c:247 RSP CR2: fffffffb8ee8fc78 ---[ end trace 2755f2b5246d2406 ]---