================================================================== BUG: KASAN: use-after-free in bpf_tree_comp kernel/bpf/core.c:437 [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:511 [inline] BUG: KASAN: use-after-free in bpf_prog_kallsyms_find+0x264/0x2c0 kernel/bpf/core.c:504 Read of size 8 at addr ffff888094559340 by task udevd/30353 CPU: 0 PID: 30353 Comm: udevd Not tainted 4.19.80 #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.cold+0x7c/0x20d mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 bpf_tree_comp kernel/bpf/core.c:437 [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:511 [inline] bpf_prog_kallsyms_find+0x264/0x2c0 kernel/bpf/core.c:504 is_bpf_text_address+0x78/0x170 kernel/bpf/core.c:546 kernel_text_address+0x73/0xf0 kernel/extable.c:152 __kernel_text_address+0xd/0x40 kernel/extable.c:107 unwind_get_return_address arch/x86/kernel/unwind_frame.c:18 [inline] unwind_get_return_address+0x61/0xa0 arch/x86/kernel/unwind_frame.c:13 __save_stack_trace+0x99/0x100 arch/x86/kernel/stacktrace.c:45 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60 save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:490 slab_post_alloc_hook mm/slab.h:445 [inline] slab_alloc mm/slab.c:3397 [inline] kmem_cache_alloc+0x11b/0x700 mm/slab.c:3557 vm_area_dup+0x21/0x170 kernel/fork.c:323 dup_mmap kernel/fork.c:484 [inline] dup_mm kernel/fork.c:1283 [inline] copy_mm kernel/fork.c:1339 [inline] copy_process.part.0+0x3407/0x7a30 kernel/fork.c:1892 copy_process kernel/fork.c:1689 [inline] _do_fork+0x257/0xfd0 kernel/fork.c:2202 __do_sys_clone kernel/fork.c:2309 [inline] __se_sys_clone kernel/fork.c:2303 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2303 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fa48c1c7f46 Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 14 25 10 00 00 00 31 d2 49 81 c2 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 31 01 00 00 85 c0 41 89 c4 0f 85 3b 01 00 RSP: 002b:00007fffe459fbc0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fffe459fbc0 RCX: 00007fa48c1c7f46 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007fffe459fc20 R08: 0000000000007691 R09: 0000000000007691 R10: 00007fa48cae4a70 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffe459fbe0 R14: 0000000000000005 R15: 0000000000000005 Allocated by task 13429: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 kmem_cache_alloc_trace+0x152/0x760 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] bpf_prog_alloc+0x216/0x2a0 kernel/bpf/core.c:90 jit_subprogs kernel/bpf/verifier.c:5814 [inline] fixup_call_args kernel/bpf/verifier.c:5933 [inline] bpf_check+0x3e7f/0x6259 kernel/bpf/verifier.c:6340 bpf_prog_load+0xdcf/0x13f0 kernel/bpf/syscall.c:1445 __do_sys_bpf kernel/bpf/syscall.c:2411 [inline] __se_sys_bpf kernel/bpf/syscall.c:2373 [inline] __x64_sys_bpf+0x32b/0x4c0 kernel/bpf/syscall.c:2373 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 6244: save_stack+0x45/0xd0 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:3503 [inline] kfree+0xcf/0x220 mm/slab.c:3822 bpf_jit_free+0xa5/0x300 bpf_prog_free_deferred+0x1a6/0x420 kernel/bpf/core.c:1809 process_one_work+0x989/0x1750 kernel/workqueue.c:2153 worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 The buggy address belongs to the object at ffff8880945592c0 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 128 bytes inside of 256-byte region [ffff8880945592c0, ffff8880945593c0) The buggy address belongs to the page: page:ffffea0002515640 count:1 mapcount:0 mapping:ffff88812c3f07c0 index:0x0 flags: 0x1fffc0000000100(slab) raw: 01fffc0000000100 ffffea00020d3c48 ffffea0002642808 ffff88812c3f07c0 raw: 0000000000000000 ffff888094559040 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888094559200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888094559280: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff888094559300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888094559380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888094559400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================