================================================================== BUG: KASAN: use-after-free in dev_map_flush_old kernel/bpf/devmap.c:389 [inline] BUG: KASAN: use-after-free in __dev_map_entry_free+0x2a9/0x330 kernel/bpf/devmap.c:403 Read of size 8 at addr ffff88808da23948 by task blkid/23084 CPU: 0 PID: 23084 Comm: blkid Not tainted 5.0.0-rc4+ #47 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:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 dev_map_flush_old kernel/bpf/devmap.c:389 [inline] __dev_map_entry_free+0x2a9/0x330 kernel/bpf/devmap.c:403 __rcu_reclaim kernel/rcu/rcu.h:240 [inline] rcu_do_batch kernel/rcu/tree.c:2452 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2773 [inline] rcu_process_callbacks+0x928/0x1390 kernel/rcu/tree.c:2754 __do_softirq+0x266/0x95a kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:remove_vma+0x76/0x180 mm/mmap.c:180 Code: 8d bc 24 90 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e0 00 00 00 49 8b 9c 24 90 00 00 00 <48> 85 db 74 3a e8 e0 fe d3 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc RSP: 0018:ffff8880647dfbc0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffffffff12b97f7 RDX: 1ffff1101295eb3b RSI: 00000000ffffffff RDI: ffff888094af59d8 RBP: ffff8880647dfbe0 R08: ffff888093f4c180 R09: ffffed1015d05bc8 R10: ffffed1015d05bc7 R11: ffff8880ae82de3b R12: ffff888094af5948 R13: 1ffff1100c8fbf7f R14: ffff8880a4663a50 R15: 0000000000000038 exit_mmap+0x369/0x530 mm/mmap.c:3151 __mmput kernel/fork.c:1047 [inline] mmput+0x15f/0x4c0 kernel/fork.c:1068 exit_mm kernel/exit.c:545 [inline] do_exit+0x838/0x2db0 kernel/exit.c:854 do_group_exit+0x135/0x370 kernel/exit.c:971 __do_sys_exit_group kernel/exit.c:982 [inline] __se_sys_exit_group kernel/exit.c:980 [inline] __x64_sys_exit_group+0x44/0x50 kernel/exit.c:980 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f1a69ca91e8 Code: Bad RIP value. RSP: 002b:00007fffde933208 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f1a69ca91e8 RDX: 0000000000000002 RSI: 000000000000003c RDI: 0000000000000002 RBP: 00007f1a69f7e840 R08: 00000000000000e7 R09: ffffffffffffffa8 R10: 00007f1a69f84740 R11: 0000000000000246 R12: 00007f1a69f7e840 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 23079: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3609 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] dev_map_alloc kernel/bpf/devmap.c:102 [inline] dev_map_alloc+0x1be/0x6e0 kernel/bpf/devmap.c:88 find_and_alloc_map kernel/bpf/syscall.c:129 [inline] map_create kernel/bpf/syscall.c:526 [inline] __do_sys_bpf+0x97b/0x3ea0 kernel/bpf/syscall.c:2642 __se_sys_bpf kernel/bpf/syscall.c:2619 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2619 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9201: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kfree+0xcf/0x230 mm/slab.c:3806 dev_map_free+0x43c/0x540 kernel/bpf/devmap.c:192 bpf_map_free_deferred+0xba/0xf0 kernel/bpf/syscall.c:290 process_one_work+0x98e/0x1760 kernel/workqueue.c:2153 worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff88808da23840 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 264 bytes inside of 512-byte region [ffff88808da23840, ffff88808da23a40) The buggy address belongs to the page: page:ffffea00023688c0 count:1 mapcount:0 mapping:ffff88812c3f0940 index:0xffff88808da23d40 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00029f83c8 ffffea0002526988 ffff88812c3f0940 raw: ffff88808da23d40 ffff88808da230c0 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808da23800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff88808da23880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808da23900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808da23980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808da23a00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================