================================================================== BUG: KASAN: use-after-free in uprobe_cmp kernel/events/uprobes.c:620 [inline] BUG: KASAN: use-after-free in __uprobe_cmp_key kernel/events/uprobes.c:646 [inline] BUG: KASAN: use-after-free in rb_find include/linux/rbtree.h:289 [inline] BUG: KASAN: use-after-free in __find_uprobe kernel/events/uprobes.c:661 [inline] BUG: KASAN: use-after-free in find_uprobe+0x12c/0x150 kernel/events/uprobes.c:678 Read of size 8 at addr ffff888024ff4968 by task syz-executor618/8377 CPU: 1 PID: 8377 Comm: syz-executor618 Not tainted 5.11.0-rc6-next-20210205-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416 uprobe_cmp kernel/events/uprobes.c:620 [inline] __uprobe_cmp_key kernel/events/uprobes.c:646 [inline] rb_find include/linux/rbtree.h:289 [inline] __find_uprobe kernel/events/uprobes.c:661 [inline] find_uprobe+0x12c/0x150 kernel/events/uprobes.c:678 uprobe_unregister+0x1e/0x70 kernel/events/uprobes.c:1111 __probe_event_disable+0x11e/0x240 kernel/trace/trace_uprobe.c:1084 probe_event_disable+0x155/0x1c0 kernel/trace/trace_uprobe.c:1171 trace_uprobe_register+0x45a/0x880 kernel/trace/trace_uprobe.c:1459 perf_trace_event_unreg.isra.0+0xac/0x250 kernel/trace/trace_event_perf.c:162 perf_uprobe_destroy+0xbb/0x130 kernel/trace/trace_event_perf.c:349 _free_event+0x2ee/0x1380 kernel/events/core.c:4830 put_event kernel/events/core.c:4924 [inline] perf_event_release_kernel+0xa24/0xe00 kernel/events/core.c:5039 perf_release+0x33/0x40 kernel/events/core.c:5049 __fput+0x283/0x920 fs/file_table.c:280 task_work_run+0xdd/0x190 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xc5c/0x2ae0 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:922 __do_sys_exit_group kernel/exit.c:933 [inline] __se_sys_exit_group kernel/exit.c:931 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x43daf9 Code: Unable to access opcode bytes at RIP 0x43dacf. RSP: 002b:00007ffe10cfd028 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00000000004ae230 RCX: 000000000043daf9 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00000000004ae230 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 Allocated by task 8377: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:403 [inline] ____kasan_kmalloc mm/kasan/common.c:434 [inline] ____kasan_kmalloc.constprop.0+0xa0/0xd0 mm/kasan/common.c:406 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:686 [inline] alloc_uprobe kernel/events/uprobes.c:731 [inline] __uprobe_register+0x19c/0x850 kernel/events/uprobes.c:1167 trace_uprobe_enable kernel/trace/trace_uprobe.c:1060 [inline] probe_event_enable+0x357/0xa00 kernel/trace/trace_uprobe.c:1129 trace_uprobe_register+0x443/0x880 kernel/trace/trace_uprobe.c:1456 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x549/0xa20 kernel/trace/trace_event_perf.c:204 perf_uprobe_init+0x16f/0x210 kernel/trace/trace_event_perf.c:336 perf_uprobe_event_init+0xff/0x1c0 kernel/events/core.c:9721 perf_try_init_event+0x12a/0x560 kernel/events/core.c:11038 perf_init_event kernel/events/core.c:11090 [inline] perf_event_alloc.part.0+0xe3b/0x3960 kernel/events/core.c:11370 perf_event_alloc kernel/events/core.c:11749 [inline] __do_sys_perf_event_open+0x647/0x2e60 kernel/events/core.c:11847 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 8377: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free.part.0+0xe1/0x110 mm/kasan/common.c:364 kasan_slab_free include/linux/kasan.h:191 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x82/0x1d0 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xe5/0x7b0 mm/slub.c:4202 put_uprobe kernel/events/uprobes.c:612 [inline] put_uprobe+0x13b/0x190 kernel/events/uprobes.c:601 uprobe_apply+0xfc/0x130 kernel/events/uprobes.c:1231 uprobe_perf_open kernel/trace/trace_uprobe.c:1311 [inline] trace_uprobe_register+0x5c9/0x880 kernel/trace/trace_uprobe.c:1463 perf_trace_event_open kernel/trace/trace_event_perf.c:186 [inline] perf_trace_event_init kernel/trace/trace_event_perf.c:208 [inline] perf_trace_event_init+0x17a/0xa20 kernel/trace/trace_event_perf.c:195 perf_uprobe_init+0x16f/0x210 kernel/trace/trace_event_perf.c:336 perf_uprobe_event_init+0xff/0x1c0 kernel/events/core.c:9721 perf_try_init_event+0x12a/0x560 kernel/events/core.c:11038 perf_init_event kernel/events/core.c:11090 [inline] perf_event_alloc.part.0+0xe3b/0x3960 kernel/events/core.c:11370 perf_event_alloc kernel/events/core.c:11749 [inline] __do_sys_perf_event_open+0x647/0x2e60 kernel/events/core.c:11847 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff888024ff4800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 360 bytes inside of 512-byte region [ffff888024ff4800, ffff888024ff4a00) The buggy address belongs to the page: page:00000000feb700c4 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24ff4 head:00000000feb700c4 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010841c80 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888024ff4800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024ff4880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888024ff4900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888024ff4980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024ff4a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================