================================================================== 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 ffff888061cd0dc8 by task modprobe/17445 CPU: 1 PID: 17445 Comm: modprobe Not tainted 5.0.0+ #64 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:132 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:227 [inline] rcu_do_batch kernel/rcu/tree.c:2475 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2788 [inline] rcu_core+0x928/0x1390 kernel/rcu/tree.c:2769 __do_softirq+0x266/0x95a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:374 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:414 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:767 [inline] RIP: 0010:lock_is_held_type+0x272/0x320 kernel/locking/lockdep.c:4251 Code: ff df c7 83 7c 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 88 00 00 00 48 83 3d 96 dc 3b 07 00 74 31 48 8b 7d c0 57 9d <0f> 1f 44 00 00 48 83 c4 20 44 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d RSP: 0000:ffff8880a64ffb48 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff112532e RBX: ffff88806a624340 RCX: ffff88806a624bc0 RDX: dffffc0000000000 RSI: ffff88809fd037d0 RDI: 0000000000000282 RBP: ffff8880a64ffb90 R08: ffff88806a624340 R09: fffff9400004c227 R10: fffff9400004c226 R11: ffffea0000261137 R12: 0000000000000000 R13: ffff88806a624c10 R14: ffff88809fd037d0 R15: 0000000000000003 lock_is_held include/linux/lockdep.h:351 [inline] xa_entry include/linux/xarray.h:1144 [inline] xas_next_entry include/linux/xarray.h:1568 [inline] filemap_map_pages+0x91a/0x12e0 mm/filemap.c:2639 do_fault_around mm/memory.c:3410 [inline] do_read_fault mm/memory.c:3444 [inline] do_fault mm/memory.c:3578 [inline] handle_pte_fault mm/memory.c:3809 [inline] __handle_mm_fault+0x31ed/0x3ec0 mm/memory.c:3933 handle_mm_fault+0x43f/0xb30 mm/memory.c:3970 do_user_addr_fault arch/x86/mm/fault.c:1475 [inline] __do_page_fault+0x5ef/0xda0 arch/x86/mm/fault.c:1541 do_page_fault+0x71/0x581 arch/x86/mm/fault.c:1572 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143 RIP: 0033:0x7f7dfa56c82a Code: a9 20 00 16 00 00 00 83 c8 ff c3 90 90 90 90 90 66 0f 6e ce 48 89 f9 66 0f 60 c9 48 83 e7 f0 66 0f ef d2 66 0f 60 c9 83 ce ff <66> 0f 6f 07 66 0f 70 c9 00 48 29 f9 66 0f 6f d8 48 8d 7f 10 66 0f RSP: 002b:00007ffe5ead7b08 EFLAGS: 00010286 RAX: 0000000000000001 RBX: 00007f7dfa339b40 RCX: 00007f7df9fc8de3 RDX: 00007ffe5ead7d20 RSI: 00000000ffffffff RDI: 00007f7df9fc8de0 RBP: 00007ffe5ead7ed0 R08: 00007f7dfa7749a8 R09: 0000000000000000 R10: 000000006ffffeff R11: 0000000000000206 R12: 00007f7dfa7749a8 R13: 0000000000000000 R14: 00007f7df9fc8de3 R15: 00007ffe5ead7b10 Allocated by task 17433: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:511 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3621 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+0x946/0x3e50 kernel/bpf/syscall.c:2687 __se_sys_bpf kernel/bpf/syscall.c:2664 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2664 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7715: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3821 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/0x1790 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x357/0x430 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff888061cd0cc0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 264 bytes inside of 512-byte region [ffff888061cd0cc0, ffff888061cd0ec0) The buggy address belongs to the page: page:ffffea0001873400 count:1 mapcount:0 mapping:ffff88812c3f0940 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002489ec8 ffffea0001aadd48 ffff88812c3f0940 raw: 0000000000000000 ffff888061cd0040 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888061cd0c80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff888061cd0d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888061cd0d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888061cd0e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888061cd0e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================