================================================================== BUG: KASAN: slab-out-of-bounds in hlist_add_head include/linux/list.h:673 [inline] BUG: KASAN: slab-out-of-bounds in enqueue_timer kernel/time/timer.c:520 [inline] BUG: KASAN: slab-out-of-bounds in __internal_add_timer+0x275/0x2d0 kernel/time/timer.c:531 Write of size 8 at addr ffff88003adfbc08 by task sysctl/3757 CPU: 1 PID: 3757 Comm: sysctl Not tainted 4.13.0-next-20170914+ #4 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 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+0x24e/0x340 mm/kasan/report.c:409 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:435 hlist_add_head include/linux/list.h:673 [inline] enqueue_timer kernel/time/timer.c:520 [inline] __internal_add_timer+0x275/0x2d0 kernel/time/timer.c:531 internal_add_timer kernel/time/timer.c:573 [inline] __mod_timer kernel/time/timer.c:1024 [inline] mod_timer+0x622/0x15b0 kernel/time/timer.c:1071 rpm_suspend+0x126b/0x1610 drivers/base/power/runtime.c:533 pm_suspend_timer_fn+0x166/0x1d0 drivers/base/power/runtime.c:909 call_timer_fn+0x246/0x850 kernel/time/timer.c:1281 expire_timers kernel/time/timer.c:1320 [inline] __run_timers+0x7fd/0xb90 kernel/time/timer.c:1620 run_timer_softirq+0x4c/0xb0 kernel/time/timer.c:1646 __do_softirq+0x2bb/0xbd0 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:638 [inline] smp_apic_timer_interrupt+0x177/0x710 arch/x86/kernel/apic/apic.c:1048 apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:577 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:777 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x5e/0xba kernel/locking/spinlock.c:191 RSP: 0018:ffff8800535f7bf0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: dffffc0000000000 RBX: 0000000000000282 RCX: 0000000000000000 RDX: 1ffffffff0b592fd RSI: 0000000000000001 RDI: 0000000000000282 RBP: ffff8800535f7c00 R08: ffff88007fff705c R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88003d38add0 R13: 0000000000000041 R14: 0000000000000001 R15: 0000000000000282 spin_unlock_irqrestore include/linux/spinlock.h:371 [inline] __wake_up_sync_key+0x4b/0x60 kernel/sched/wait.c:148 pipe_write+0x64e/0xd70 fs/pipe.c:481 call_write_iter include/linux/fs.h:1770 [inline] new_sync_write fs/read_write.c:468 [inline] __vfs_write+0x68a/0x970 fs/read_write.c:481 vfs_write+0x18f/0x510 fs/read_write.c:543 SYSC_write fs/read_write.c:588 [inline] SyS_write+0xef/0x220 fs/read_write.c:580 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x7f4086fcd370 RSP: 002b:00007ffd514227a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000000002c RCX: 00007f4086fcd370 RDX: 000000000000002c RSI: 00007f40876cb000 RDI: 0000000000000001 RBP: 0000000000000082 R08: 00007f40876c7700 R09: 00007f40876c7700 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000013220c7 R13: 0000000000000027 R14: 0000000000000027 R15: 00000000013220a0 Allocated by task 3678: 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 kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3627 kmalloc include/linux/slab.h:493 [inline] kzalloc include/linux/slab.h:666 [inline] tipc_nametbl_init+0x241/0x5e0 net/tipc/name_table.c:810 tipc_init_net+0x347/0x570 net/tipc/core.c:69 ops_init+0x10a/0x570 net/core/net_namespace.c:118 setup_net+0x319/0x720 net/core/net_namespace.c:294 copy_net_ns+0x27c/0x580 net/core/net_namespace.c:418 create_new_namespaces+0x425/0x880 kernel/nsproxy.c:107 copy_namespaces+0x340/0x400 kernel/nsproxy.c:165 copy_process.part.36+0x22fd/0x4af0 kernel/fork.c:1738 copy_process kernel/fork.c:1548 [inline] _do_fork+0x1ef/0xfe0 kernel/fork.c:2027 SYSC_clone kernel/fork.c:2137 [inline] SyS_clone+0x37/0x50 kernel/fork.c:2131 do_syscall_64+0x26c/0x8c0 arch/x86/entry/common.c:287 return_from_SYSCALL_64+0x0/0x7a Freed by task 3393: 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:3503 [inline] kfree+0xca/0x250 mm/slab.c:3820 kvfree+0x36/0x60 mm/util.c:416 netdev_freemem net/core/dev.c:7970 [inline] free_netdev+0x2cf/0x360 net/core/dev.c:8132 tun_set_iff drivers/net/tun.c:2105 [inline] __tun_chr_ioctl+0x2cf6/0x3d20 drivers/net/tun.c:2276 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:2521 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 ffff88003adf8800 which belongs to the cache kmalloc-16384 of size 16384 The buggy address is located 13320 bytes inside of 16384-byte region [ffff88003adf8800, ffff88003adfc800) The buggy address belongs to the page: page:ffffea0000eb7e00 count:1 mapcount:0 mapping:ffff88003adf8800 index:0x0 compound_mapcount: 0 flags: 0x100000000008100(slab|head) raw: 0100000000008100 ffff88003adf8800 0000000000000000 0000000100000001 raw: ffffea0000f6e820 ffff88003e801c50 ffff88003e802200 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88003adfbb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88003adfbb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88003adfbc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88003adfbc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88003adfbd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================