================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:199 [inline] BUG: KASAN: use-after-free in __lt_find include/linux/rbtree_latch.h:118 [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+0x2a9/0x2c0 kernel/bpf/core.c:667 Read of size 8 at addr ffff8880a90b7048 by task syz-executor688/11493 CPU: 1 PID: 11493 Comm: syz-executor688 Not tainted 5.4.0-rc4+ #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 __read_once_size include/linux/compiler.h:199 [inline] __lt_find include/linux/rbtree_latch.h:118 [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+0x2a9/0x2c0 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_slab_alloc+0xf/0x20 mm/kasan/common.c:518 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc mm/slab.c:3319 [inline] kmem_cache_alloc+0x121/0x710 mm/slab.c:3483 __d_alloc+0x2e/0x8c0 fs/dcache.c:1688 d_alloc+0x4d/0x280 fs/dcache.c:1767 d_alloc_parallel+0xf4/0x1c30 fs/dcache.c:2519 __lookup_slow+0x1ab/0x500 fs/namei.c:1646 lookup_slow+0x58/0x80 fs/namei.c:1680 walk_component+0x747/0x2000 fs/namei.c:1800 link_path_walk.part.0+0x5ab/0x1340 fs/namei.c:2128 link_path_walk fs/namei.c:2062 [inline] path_openat+0x202/0x46d0 fs/namei.c:3524 do_filp_open+0x1a1/0x280 fs/namei.c:3555 do_sys_open+0x3fe/0x5d0 fs/open.c:1097 __do_sys_open fs/open.c:1115 [inline] __se_sys_open fs/open.c:1110 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1110 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4011a0 Code: 01 f0 ff ff 0f 83 c0 0b 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d 2d 15 2d 00 00 75 14 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 94 0b 00 00 c3 48 83 ec 08 e8 fa 00 00 00 RSP: 002b:00007fff62581448 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fff62581474 RCX: 00000000004011a0 RDX: 00007fff6258147a RSI: 0000000000080001 RDI: 00000000004a2422 RBP: 00007fff62581470 R08: 0000000000000000 R09: 0000000000000004 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004021c0 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 11491: 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:556 [inline] kzalloc include/linux/slab.h:690 [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 3120: 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 ffff8880a90b7000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 72 bytes inside of 512-byte region [ffff8880a90b7000, ffff8880a90b7200) The buggy address belongs to the page: page:ffffea0002a42dc0 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002a42d88 ffffea0002a1e088 ffff8880aa400a80 raw: 0000000000000000 ffff8880a90b7000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a90b6f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a90b6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880a90b7000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a90b7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a90b7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================