================================================================== BUG: KASAN: use-after-free in bpf_tree_comp kernel/bpf/core.c:559 [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+0x1d1/0x2e0 kernel/bpf/core.c:633 Read of size 8 at addr ffff8880a8a295c8 by task blkid/2434 CPU: 0 PID: 2434 Comm: blkid Not tainted 4.20.0-rc6+ #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+0x16b/0x224 lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 bpf_tree_comp kernel/bpf/core.c:559 [inline] __lt_find include/linux/rbtree_latch.h:115 [inline] latch_tree_find include/linux/rbtree_latch.h:208 [inline] bpf_prog_kallsyms_find+0x1d1/0x2e0 kernel/bpf/core.c:633 is_bpf_text_address+0x48/0xe0 kernel/bpf/core.c:668 kernel_text_address+0x79/0xf0 kernel/extable.c:152 __kernel_text_address+0xd/0x40 kernel/extable.c:107 unwind_get_return_address+0x61/0xa0 arch/x86/kernel/unwind_frame.c:18 __save_stack_trace+0x8d/0xf0 arch/x86/kernel/stacktrace.c:45 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60 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 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 slab_post_alloc_hook mm/slab.h:444 [inline] slab_alloc mm/slab.c:3392 [inline] kmem_cache_alloc+0x11b/0x730 mm/slab.c:3552 ptlock_alloc+0x1d/0x70 mm/memory.c:4555 ptlock_init include/linux/mm.h:1897 [inline] pgtable_page_ctor include/linux/mm.h:1931 [inline] pte_alloc_one+0x4e/0x130 arch/x86/mm/pgtable.c:38 do_fault_around mm/memory.c:3362 [inline] do_read_fault mm/memory.c:3403 [inline] do_fault mm/memory.c:3534 [inline] handle_pte_fault mm/memory.c:3765 [inline] __handle_mm_fault+0x2f80/0x4190 mm/memory.c:3889 handle_mm_fault+0x36f/0x8d0 mm/memory.c:3926 do_user_addr_fault arch/x86/mm/fault.c:1423 [inline] __do_page_fault+0x400/0xa80 arch/x86/mm/fault.c:1489 do_page_fault+0x64/0x3a7 arch/x86/mm/fault.c:1520 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143 RIP: 0033:0x7ff56c6c0f84 Code: 10 4d 89 4b 18 5b 5d c3 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec 08 48 8b 87 98 02 00 00 48 85 c0 74 5f 48 8b 40 08 <8b> 08 89 8f ec 02 00 00 8b 50 08 44 8b 40 04 8d 72 ff 85 d6 75 72 RSP: 002b:00007fff774dbbc0 EFLAGS: 00010206 RAX: 00007ff56c1042b8 RBX: 00007ff56c8d69a8 RCX: 00007ff56c6ce1d7 RDX: 0000000000000000 RSI: 0000000000000010 RDI: 00007ff56c8d69a8 RBP: 00007fff774dbd30 R08: 0000000070000029 R09: 000000006ffffdff R10: 000000006ffffeff R11: 0000000000000206 R12: 00007fff774dbe18 R13: 000000006fffff48 R14: 00007fff774dba80 R15: 00007fff774dba20 Allocated by task 2435: 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:546 [inline] kzalloc include/linux/slab.h:741 [inline] bpf_prog_alloc+0xcd/0x270 kernel/bpf/core.c:91 jit_subprogs kernel/bpf/verifier.c:6443 [inline] fixup_call_args kernel/bpf/verifier.c:6573 [inline] bpf_check+0x4319/0x74e0 kernel/bpf/verifier.c:6966 bpf_prog_load+0xa81/0x11b0 kernel/bpf/syscall.c:1532 __do_sys_bpf+0x874/0x2ed0 kernel/bpf/syscall.c:2613 __se_sys_bpf kernel/bpf/syscall.c:2575 [inline] __x64_sys_bpf+0x6e/0xb0 kernel/bpf/syscall.c:2575 do_syscall_64+0xd0/0x4d0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 14825: 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/0x220 mm/slab.c:3817 bpf_jit_free+0x6f/0x270 bpf_prog_free_deferred+0x151/0x390 kernel/bpf/core.c:1958 process_one_work+0x830/0x1670 kernel/workqueue.c:2153 worker_thread+0x85/0xb60 kernel/workqueue.c:2296 kthread+0x324/0x3e0 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8880a8a29540 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 136 bytes inside of 512-byte region [ffff8880a8a29540, ffff8880a8a29740) The buggy address belongs to the page: page:ffffea0002a28a40 count:1 mapcount:0 mapping:ffff88812c366940 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00021f7d08 ffffea0002409f48 ffff88812c366940 raw: 0000000000000000 ffff8880a8a29040 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a8a29480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880a8a29500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff8880a8a29580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a8a29600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a8a29680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================