audit: type=1804 audit(1550201980.967:37): pid=8510 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir073268612/syzkaller.RM8uUX/19/memory.events" dev="sda1" ino=16636 res=1 ================================================================== 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 ffff88806c17cb08 by task kauditd/26 CPU: 1 PID: 26 Comm: kauditd Not tainted 5.0.0-rc4+ #36 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:766 [inline] RIP: 0010:console_unlock+0xc0d/0x10a0 kernel/printk/printk.c:2416 Code: fc ff df 48 c1 e8 03 80 3c 08 00 0f 85 49 04 00 00 48 83 3d f4 55 38 07 00 0f 84 af 02 00 00 e8 a9 af 15 00 48 8b 7d 98 57 9d <0f> 1f 44 00 00 e9 5f ff ff ff e8 94 af 15 00 48 8b 7d 08 c7 05 b6 RSP: 0018:ffff8880a9a6fb78 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8880a9a5e6c0 RBX: 0000000000000200 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff815a2c07 RDI: 0000000000000293 RBP: ffff8880a9a6fc08 R08: ffff8880a9a5e6c0 R09: ffff8880a9a5ef60 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff841a7b90 R14: ffffffff88f826d0 R15: 0000000000009d01 vprintk_emit+0x280/0x6d0 kernel/printk/printk.c:1931 vprintk_default+0x28/0x30 kernel/printk/printk.c:1958 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398 printk+0xba/0xed kernel/printk/printk.c:1991 kauditd_printk_skb kernel/audit.c:545 [inline] kauditd_hold_skb.cold+0x3f/0x4e kernel/audit.c:578 kauditd_send_queue+0x133/0x170 kernel/audit.c:741 kauditd_thread+0x732/0xa60 kernel/audit.c:867 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Allocated by task 8515: 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 7472: 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 ffff88806c17ca00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 264 bytes inside of 512-byte region [ffff88806c17ca00, ffff88806c17cc00) The buggy address belongs to the page: page:ffffea0001b05f00 count:1 mapcount:0 mapping:ffff88812c3f0940 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000224c8c8 ffffea0001b05fc8 ffff88812c3f0940 raw: 0000000000000000 ffff88806c17c000 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88806c17ca00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806c17ca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88806c17cb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806c17cb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806c17cc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================