IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KASAN: use-after-free in uprobe_perf_close+0x3e0/0x570 kernel/trace/trace_uprobe.c:1048 Read of size 4 at addr ffff8801d96ec44c by task syzkaller137233/4515 CPU: 0 PID: 4515 Comm: syzkaller137233 Not tainted 4.16.0+ #286 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1a7/0x27d lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23c/0x360 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 uprobe_perf_close+0x3e0/0x570 kernel/trace/trace_uprobe.c:1048 trace_uprobe_register+0x4cb/0xc00 kernel/trace/trace_uprobe.c:1210 perf_trace_event_close kernel/trace/trace_event_perf.c:186 [inline] perf_uprobe_destroy+0x9b/0x130 kernel/trace/trace_event_perf.c:335 _free_event+0x3d7/0x11f0 kernel/events/core.c:4445 put_event+0x35/0x40 kernel/events/core.c:4528 perf_event_release_kernel+0x6e8/0xfe0 kernel/events/core.c:4634 perf_release+0x37/0x50 kernel/events/core.c:4644 __fput+0x327/0x7f0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1ab/0x280 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xa75/0x2700 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 SYSC_exit_group kernel/exit.c:979 [inline] SyS_exit_group+0x1d/0x20 kernel/exit.c:977 do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f08c99 RSP: 002b:00000000ff807c7c EFLAGS: 00000282 ORIG_RAX: 00000000000000fc RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000000000 RDX: 000000008574d900 RSI: 0000000000000004 RDI: 0000000000000001 RBP: 00000000080c7269 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 4515: 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:552 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc_node+0x144/0x760 mm/slab.c:3632 alloc_task_struct_node kernel/fork.c:157 [inline] dup_task_struct kernel/fork.c:770 [inline] copy_process.part.38+0x1ab9/0x6140 kernel/fork.c:1631 copy_process kernel/fork.c:1606 [inline] _do_fork+0x1f7/0xfa0 kernel/fork.c:2087 SYSC_clone kernel/fork.c:2194 [inline] SyS_clone+0x37/0x50 kernel/fork.c:2188 C_SYSC_x86_clone arch/x86/ia32/sys_ia32.c:244 [inline] compat_SyS_x86_clone+0x35/0x40 arch/x86/ia32/sys_ia32.c:240 do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] do_int80_syscall_32+0x2ad/0x9c0 arch/x86/entry/common.c:344 entry_INT80_compat+0x6e/0x78 arch/x86/entry/entry_64_compat.S:400 Freed by task 0: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527 __cache_free mm/slab.c:3486 [inline] kmem_cache_free+0x83/0x2a0 mm/slab.c:3744 free_task_struct kernel/fork.c:162 [inline] free_task+0x155/0x1b0 kernel/fork.c:391 __put_task_struct+0x24b/0x3e0 kernel/fork.c:657 put_task_struct include/linux/sched/task.h:96 [inline] delayed_put_task_struct+0xd8/0x3e0 kernel/exit.c:180 __rcu_reclaim kernel/rcu/rcu.h:178 [inline] rcu_do_batch kernel/rcu/tree.c:2675 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2930 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2897 [inline] rcu_process_callbacks+0xd6c/0x17b0 kernel/rcu/tree.c:2914 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 The buggy address belongs to the object at ffff8801d96ec400 which belongs to the cache task_struct of size 6016 The buggy address is located 76 bytes inside of 6016-byte region [ffff8801d96ec400, ffff8801d96edb80) The buggy address belongs to the page: page:ffffea000765bb00 count:1 mapcount:0 mapping:ffff8801d96ec400 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801d96ec400 0000000000000000 0000000100000001 raw: ffffea0006ad1e20 ffffea0006aedda0 ffff8801dad46200 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d96ec300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801d96ec380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801d96ec400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d96ec480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d96ec500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================