================================================================== BUG: KASAN: use-after-free in uprobe_cmp kernel/events/uprobes.c:620 [inline] BUG: KASAN: use-after-free in __uprobe_cmp kernel/events/uprobes.c:652 [inline] BUG: KASAN: use-after-free in rb_find_add include/linux/rbtree.h:259 [inline] BUG: KASAN: use-after-free in __insert_uprobe kernel/events/uprobes.c:688 [inline] BUG: KASAN: use-after-free in insert_uprobe kernel/events/uprobes.c:710 [inline] BUG: KASAN: use-after-free in alloc_uprobe kernel/events/uprobes.c:742 [inline] BUG: KASAN: use-after-free in __uprobe_register+0x70f/0x850 kernel/events/uprobes.c:1167 Read of size 8 at addr ffff88801431e568 by task syz-executor.1/12044 CPU: 1 PID: 12044 Comm: syz-executor.1 Not tainted 5.11.0-rc6-next-20210201-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 kernel/events/uprobes.c:652 [inline] rb_find_add include/linux/rbtree.h:259 [inline] __insert_uprobe kernel/events/uprobes.c:688 [inline] insert_uprobe kernel/events/uprobes.c:710 [inline] alloc_uprobe kernel/events/uprobes.c:742 [inline] __uprobe_register+0x70f/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 RIP: 0033:0x465b09 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f794e7b5188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffc57b951ef R14: 00007f794e7b5300 R15: 0000000000022000 Allocated by task 12044: 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 12044: 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 ffff88801431e400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 360 bytes inside of 512-byte region [ffff88801431e400, ffff88801431e600) The buggy address belongs to the page: page:00000000190eb343 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1431e head:00000000190eb343 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 0000000000000000 0000000100000001 ffff88800fc41c80 raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88801431e400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801431e480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801431e500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801431e580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801431e600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================