================================================================== BUG: KASAN: use-after-free in hlist_move_list include/linux/list.h:729 [inline] BUG: KASAN: use-after-free in __collect_expired_timers kernel/time/timer.c:1339 [inline] BUG: KASAN: use-after-free in collect_expired_timers kernel/time/timer.c:1569 [inline] BUG: KASAN: use-after-free in __run_timers+0xa2e/0xb90 kernel/time/timer.c:1616 Write of size 8 at addr ffff88019f8cc008 by task sshd/2981 CPU: 0 PID: 2981 Comm: sshd Not tainted 4.14.0-rc2-mm1+ #10 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x25b/0x340 mm/kasan/report.c:409 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:435 hlist_move_list include/linux/list.h:729 [inline] __collect_expired_timers kernel/time/timer.c:1339 [inline] collect_expired_timers kernel/time/timer.c:1569 [inline] __run_timers+0xa2e/0xb90 kernel/time/timer.c:1616 run_timer_softirq+0x4c/0xb0 kernel/time/timer.c:1646 __do_softirq+0x29d/0xbb2 kernel/softirq.c:284 invoke_softirq kernel/softirq.c:364 [inline] irq_exit+0x1d3/0x210 kernel/softirq.c:405 exiting_irq arch/x86/include/asm/apic.h:540 [inline] smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1041 apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:770 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:777 [inline] RIP: 0010:lock_acquire+0x256/0x580 kernel/locking/lockdep.c:4005 RSP: 0018:ffff8801d02bfa98 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11 RAX: dffffc0000000000 RBX: ffff8801cf36a500 RCX: 0000000000000000 RDX: 1ffffffff0b59715 RSI: 0000000000000001 RDI: 0000000000000286 RBP: ffff8801d02bfb90 R08: 0000000000000000 R09: 0000000000000000 R10: 1ffff1003a057e6f R11: 1ffff10039e6d733 R12: 1ffff1003a057f59 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001 __might_fault+0x13a/0x1d0 mm/memory.c:4522 _copy_from_user+0x2c/0x110 lib/usercopy.c:9 copy_from_user include/linux/uaccess.h:146 [inline] get_fd_set fs/select.c:366 [inline] core_sys_select+0x397/0x960 fs/select.c:645 SYSC_select fs/select.c:694 [inline] SyS_select+0x194/0x230 fs/select.c:676 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x7f9739d05dd3 RSP: 002b:00007ffdfe63a1d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000017 RAX: ffffffffffffffda RBX: 00007ffdfe63a260 RCX: 00007f9739d05dd3 RDX: 0000561d6793da90 RSI: 0000561d6793dab0 RDI: 000000000000000c RBP: 0000000000000086 R08: 00007ffdfe63a200 R09: 0101010101010101 R10: 0000000000000000 R11: 0000000000000246 R12: 0000561d65f9cdc0 R13: 0000561d6793dab0 R14: 0000561d6793da90 R15: 0000000000000050 Allocated by task 10842: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 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:551 __do_kmalloc_node mm/slab.c:3690 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3697 kmalloc_node include/linux/slab.h:550 [inline] kvmalloc_node+0x64/0xd0 mm/util.c:397 kvmalloc include/linux/mm.h:529 [inline] kvzalloc include/linux/mm.h:537 [inline] alloc_netdev_mqs+0x16d/0xed0 net/core/dev.c:8044 tun_set_iff drivers/net/tun.c:2243 [inline] __tun_chr_ioctl+0x1386/0x3e40 drivers/net/tun.c:2497 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:2742 vfs_ioctl fs/ioctl.c:45 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685 SYSC_ioctl fs/ioctl.c:700 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 entry_SYSCALL_64_fastpath+0x1f/0xbe Freed by task 10842: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3504 [inline] kfree+0xca/0x250 mm/slab.c:3821 kvfree+0x36/0x60 mm/util.c:416 netdev_freemem net/core/dev.c:7996 [inline] free_netdev+0x2cf/0x360 net/core/dev.c:8158 tun_set_iff drivers/net/tun.c:2326 [inline] __tun_chr_ioctl+0x2df6/0x3e40 drivers/net/tun.c:2497 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:2742 vfs_ioctl fs/ioctl.c:45 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685 SYSC_ioctl fs/ioctl.c:700 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 entry_SYSCALL_64_fastpath+0x1f/0xbe The buggy address belongs to the object at ffff88019f8c8c00 which belongs to the cache kmalloc-16384 of size 16384 The buggy address is located 13320 bytes inside of 16384-byte region [ffff88019f8c8c00, ffff88019f8ccc00) The buggy address belongs to the page: page:ffffea00067e3200 count:1 mapcount:0 mapping:ffff88019f8c8c00 index:0x0 compound_mapcount: 0 flags: 0x200000000008100(slab|head) raw: 0200000000008100 ffff88019f8c8c00 0000000000000000 0000000100000001 raw: ffffea00074e3c20 ffffea000735b620 ffff8801dac02200 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88019f8cbf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88019f8cbf80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88019f8cc000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88019f8cc080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88019f8cc100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================