================================================================== BUG: KASAN: use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] BUG: KASAN: use-after-free in do_raw_spin_lock+0x1aa/0x1e0 kernel/locking/spinlock_debug.c:112 Read of size 4 at addr ffff88006a3a510c by task modprobe/30363 CPU: 1 PID: 30363 Comm: modprobe Not tainted 4.13.0-rc7-next-20170901+ #13 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_load4_noabort+0x14/0x20 mm/kasan/report.c:429 debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] do_raw_spin_lock+0x1aa/0x1e0 kernel/locking/spinlock_debug.c:112 __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock+0x32/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:316 [inline] snd_timer_user_interrupt+0x4f/0x3c0 sound/core/timer.c:1216 snd_timer_interrupt+0xa84/0x1520 sound/core/timer.c:808 snd_hrtimer_callback+0x1f0/0x3b0 sound/core/hrtimer.c:64 __run_hrtimer kernel/time/hrtimer.c:1213 [inline] __hrtimer_run_queues+0x349/0xe10 kernel/time/hrtimer.c:1277 hrtimer_interrupt+0x1d4/0x5f0 kernel/time/hrtimer.c:1311 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1021 [inline] smp_apic_timer_interrupt+0x156/0x710 arch/x86/kernel/apic/apic.c:1046 apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:577 RIP: 0010:uprobe_mmap+0x1/0xc90 kernel/events/uprobes.c:1067 RSP: 0018:ffff880032c1fbf0 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff10 RAX: ffff88003623c400 RBX: dffffc0000000000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff88003dabad68 RBP: ffff880032c1fcd0 R08: ffffffff81947690 R09: 1ffff10006583f47 R10: ffff88003623c400 R11: 0000000000000001 R12: ffff88003dabade0 R13: ffff88003dabadd0 R14: ffff88006bafc800 R15: ffff88003df2cca0 vma_adjust include/linux/mm.h:2077 [inline] __split_vma+0x4d5/0x8c0 mm/mmap.c:2581 split_vma+0x8f/0xc0 mm/mmap.c:2610 mprotect_fixup+0x3f5/0x640 mm/mprotect.c:351 do_mprotect_pkey+0x57d/0x900 mm/mprotect.c:489 SYSC_mprotect mm/mprotect.c:514 [inline] SyS_mprotect+0x2a/0x40 mm/mprotect.c:511 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x7fa10c7c0447 RSP: 002b:00007ffdd3a27308 EFLAGS: 00000206 ORIG_RAX: 000000000000000a RAX: ffffffffffffffda RBX: 00007fa10c9c89a8 RCX: 00007fa10c7c0447 RDX: 0000000000000001 RSI: 0000000000004000 RDI: 00007fa10c58a000 RBP: 0000000000000082 R08: 0000000000000006 R09: 0000000000000001 R10: 00007fa10c225af0 R11: 0000000000000206 R12: 00007fa10c207000 R13: 00007fa10c58e038 R14: 00007fa10c225ac0 R15: 00007fa10c58ed98 Allocated by task 30333: 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] snd_timer_user_open+0x64/0x170 sound/core/timer.c:1380 snd_open+0x1fa/0x3f0 sound/core/sound.c:175 chrdev_open+0x257/0x730 fs/char_dev.c:416 do_dentry_open+0x67f/0xd70 fs/open.c:752 vfs_open+0x107/0x220 fs/open.c:866 do_last fs/namei.c:3388 [inline] path_openat+0x1157/0x3520 fs/namei.c:3528 do_filp_open+0x25b/0x3b0 fs/namei.c:3563 do_sys_open+0x502/0x6d0 fs/open.c:1059 SYSC_open fs/open.c:1077 [inline] SyS_open+0x2d/0x40 fs/open.c:1072 entry_SYSCALL_64_fastpath+0x1f/0xbe Freed by task 30356: 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 snd_timer_user_release+0xf4/0x130 sound/core/timer.c:1408 __fput+0x333/0x7f0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:246 task_work_run+0x199/0x270 kernel/task_work.c:112 exit_task_work include/linux/task_work.h:21 [inline] do_exit+0xa52/0x1b40 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x7e8/0x17e0 kernel/signal.c:2334 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808 exit_to_usermode_loop+0x224/0x300 arch/x86/entry/common.c:158 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath+0x42f/0x500 arch/x86/entry/common.c:266 entry_SYSCALL_64_fastpath+0xbc/0xbe The buggy address belongs to the object at ffff88006a3a50c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 76 bytes inside of 512-byte region [ffff88006a3a50c0, ffff88006a3a52c0) The buggy address belongs to the page: page:ffffea0001a8e940 count:1 mapcount:0 mapping:ffff88006a3a50c0 index:0x0 flags: 0x500000000000100(slab) raw: 0500000000000100 ffff88006a3a50c0 0000000000000000 0000000100000006 raw: ffffea0001b29660 ffffea0001ada020 ffff88003e800940 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88006a3a5000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88006a3a5080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff88006a3a5100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88006a3a5180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88006a3a5200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================