================================================================== BUG: KASAN: use-after-free in delayed_uprobe_remove.part.21+0xc5/0xf0 kernel/events/uprobes.c:339 Read of size 8 at addr ffff8801b9d34c80 by task syz-executor0/24839 CPU: 1 PID: 24839 Comm: syz-executor0 Not tainted 4.19.0-rc5+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x16e/0x22a lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 delayed_uprobe_remove.part.21+0xc5/0xf0 kernel/events/uprobes.c:339 delayed_uprobe_remove kernel/events/uprobes.c:336 [inline] put_uprobe+0x2b/0x40 kernel/events/uprobes.c:575 uprobe_unregister+0x40/0x50 kernel/events/uprobes.c:1088 probe_event_disable.part.14+0x149/0x290 kernel/trace/trace_uprobe.c:1017 probe_event_disable kernel/trace/trace_uprobe.c:1262 [inline] trace_uprobe_register+0x467/0xe50 kernel/trace/trace_uprobe.c:1261 perf_trace_event_unreg.isra.3+0xa4/0x1e0 kernel/trace/trace_event_perf.c:157 perf_uprobe_destroy+0xbe/0x130 kernel/trace/trace_event_perf.c:342 _free_event+0x3ac/0x1370 kernel/events/core.c:4440 put_event+0x2b/0x30 kernel/events/core.c:4526 perf_event_release_kernel+0x797/0x1010 kernel/events/core.c:4632 perf_release+0x32/0x50 kernel/events/core.c:4642 __fput+0x303/0xab0 fs/file_table.c:278 ____fput+0x9/0x10 fs/file_table.c:309 task_work_run+0x19f/0x240 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x26e/0x300 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x587/0x700 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4576b9 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff8793fec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 00000000004576b9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff8793ff6d4 R13: 00000000004efed2 R14: 00000000004cc780 R15: 00000000ffffffff Allocated by task 24836: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620 kmalloc include/linux/slab.h:513 [inline] kzalloc include/linux/slab.h:707 [inline] delayed_uprobe_add kernel/events/uprobes.c:313 [inline] update_ref_ctr+0x2e9/0x4f0 kernel/events/uprobes.c:447 uprobe_write_opcode+0x79b/0xa60 kernel/events/uprobes.c:496 set_swbp+0xe/0x10 install_breakpoint.isra.25+0x131/0x700 kernel/events/uprobes.c:883 uprobe_mmap+0x5d1/0xff0 kernel/events/uprobes.c:1353 mmap_region+0x4aa/0x1b30 mm/mmap.c:1808 do_mmap+0x86e/0x1360 mm/mmap.c:1535 do_mmap_pgoff include/linux/mm.h:2298 [inline] vm_mmap_pgoff+0x1d7/0x2c0 mm/util.c:357 ksys_mmap_pgoff+0x40d/0x6b0 mm/mmap.c:1585 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x183/0x700 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 24841: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3813 delayed_uprobe_delete+0x182/0x250 kernel/events/uprobes.c:328 delayed_uprobe_remove.part.21+0xb0/0xf0 kernel/events/uprobes.c:347 delayed_uprobe_remove kernel/events/uprobes.c:336 [inline] uprobe_clear_state+0xbc/0x310 kernel/events/uprobes.c:1510 __mmput kernel/fork.c:997 [inline] mmput+0x18e/0x560 kernel/fork.c:1022 exit_mm kernel/exit.c:545 [inline] do_exit+0xd52/0x2320 kernel/exit.c:854 do_group_exit+0x13d/0x3c0 kernel/exit.c:970 get_signal+0x686/0x1420 kernel/signal.c:2513 do_signal+0x9c/0x21e0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x1ce/0x300 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x587/0x700 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801b9d34c80 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff8801b9d34c80, ffff8801b9d34ca0) The buggy address belongs to the page: page:ffffea0006e74d00 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801b9d34fc1 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0006e99b48 ffffea00075edfc8 ffff8801da8001c0 raw: ffff8801b9d34fc1 ffff8801b9d34000 000000010000003e 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801b9d34b80: fb fb fb fb fc fc fc fc 00 00 01 fc fc fc fc fc ffff8801b9d34c00: fb fb fb fb fc fc fc fc 00 00 00 05 fc fc fc fc >ffff8801b9d34c80: fb fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc ^ ffff8801b9d34d00: fb fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc ffff8801b9d34d80: fb fb fb fb fc fc fc fc 00 00 07 fc fc fc fc fc ==================================================================