================================================================== BUG: KASAN: use-after-free in bpf_tree_comp kernel/bpf/core.c:600 [inline] BUG: KASAN: use-after-free in __lt_find include/linux/rbtree_latch.h:115 [inline] BUG: KASAN: use-after-free in latch_tree_find include/linux/rbtree_latch.h:208 [inline] BUG: KASAN: use-after-free in bpf_prog_kallsyms_find kernel/bpf/core.c:674 [inline] BUG: KASAN: use-after-free in bpf_prog_kallsyms_find+0x264/0x2c0 kernel/bpf/core.c:667 Read of size 8 at addr ffff888064471648 by task udevd/21188 CPU: 0 PID: 21188 Comm: udevd Not tainted 5.4.0-rc1+ #0 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:634 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 bpf_tree_comp kernel/bpf/core.c:600 [inline] __lt_find include/linux/rbtree_latch.h:115 [inline] latch_tree_find include/linux/rbtree_latch.h:208 [inline] bpf_prog_kallsyms_find kernel/bpf/core.c:674 [inline] bpf_prog_kallsyms_find+0x264/0x2c0 kernel/bpf/core.c:667 is_bpf_text_address+0x78/0x170 kernel/bpf/core.c:709 kernel_text_address+0x73/0xf0 kernel/extable.c:147 __kernel_text_address+0xd/0x40 kernel/extable.c:102 unwind_get_return_address arch/x86/kernel/unwind_frame.c:19 [inline] unwind_get_return_address+0x61/0xa0 arch/x86/kernel/unwind_frame.c:14 arch_stack_walk+0x97/0xf0 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0xac/0xe0 kernel/stacktrace.c:123 save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524 kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3550 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:686 [inline] ep_alloc fs/eventpoll.c:1021 [inline] do_epoll_create+0xd7/0x3c0 fs/eventpoll.c:2056 __do_sys_epoll_create1 fs/eventpoll.c:2087 [inline] __se_sys_epoll_create1 fs/eventpoll.c:2085 [inline] __x64_sys_epoll_create1+0x31/0x40 fs/eventpoll.c:2085 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f1ccfe818d7 Code: 73 01 c3 48 8b 0d 61 85 2a 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 90 90 90 b8 23 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 31 85 2a 00 31 d2 48 29 c2 64 RSP: 002b:00007ffd94eb8608 EFLAGS: 00000246 ORIG_RAX: 0000000000000123 RAX: ffffffffffffffda RBX: 0000000001aff250 RCX: 00007f1ccfe818d7 RDX: 0000000000000000 RSI: 00007f1cd012be40 RDI: 0000000000080000 RBP: 0000000000625500 R08: 00000000000052c4 R09: 00000000000052c4 R10: 00007f1cd076da70 R11: 0000000000000246 R12: 0000000001b00b80 R13: 00007ffd94eb9727 R14: 0000000000000005 R15: 0000000001aff250 Allocated by task 29659: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524 kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3550 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:686 [inline] bpf_prog_alloc_no_stats+0xe6/0x2b0 kernel/bpf/core.c:88 jit_subprogs kernel/bpf/verifier.c:8716 [inline] fixup_call_args kernel/bpf/verifier.c:8845 [inline] bpf_check+0x6b3d/0x99c0 kernel/bpf/verifier.c:9349 bpf_prog_load+0xe68/0x1660 kernel/bpf/syscall.c:1709 __do_sys_bpf+0xa44/0x3350 kernel/bpf/syscall.c:2866 __se_sys_bpf kernel/bpf/syscall.c:2825 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2825 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 29030: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3425 [inline] kfree+0x10a/0x2c0 mm/slab.c:3756 __bpf_prog_free+0x87/0xc0 kernel/bpf/core.c:258 bpf_jit_free+0x64/0x1b0 bpf_prog_free_deferred+0x1a6/0x350 kernel/bpf/core.c:1980 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8880644715c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 136 bytes inside of 512-byte region [ffff8880644715c0, ffff8880644717c0) The buggy address belongs to the page: page:ffffea0001911c40 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002396248 ffffea00028e5008 ffff8880aa400a80 raw: 0000000000000000 ffff8880644710c0 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888064471500: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888064471580: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff888064471600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888064471680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888064471700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================