Messages in this thread | | | From | Dmitry Vyukov <> | Date | Tue, 23 Jul 2019 10:53:01 +0200 | Subject | Re: KASAN: use-after-free Read in nr_rx_frame (2) |
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On Tue, Jul 23, 2019 at 10:49 AM syzbot <syzbot+701728447042217b67c1@syzkaller.appspotmail.com> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 3bfe1fc4 Merge tag 'for-5.3/dm-changes-2' of git://git.ker.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=10413e34600000 > kernel config: https://syzkaller.appspot.com/x/.config?x=21511d77e11db3cb > dashboard link: https://syzkaller.appspot.com/bug?extid=701728447042217b67c1 > compiler: clang version 9.0.0 (/home/glider/llvm/clang > 80fee25776c2fb61e74c1ecb1a523375c2500b69) > > Unfortunately, I don't have any reproducer for this crash yet.
+net/netrom/af_netrom.c maintainers
> IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+701728447042217b67c1@syzkaller.appspotmail.com > > ================================================================== > BUG: KASAN: use-after-free in atomic_read > /./include/asm-generic/atomic-instrumented.h:26 [inline] > BUG: KASAN: use-after-free in refcount_inc_not_zero_checked+0x7c/0x280 > /lib/refcount.c:123 > Read of size 4 at addr ffff88808ee52080 by task swapper/1/0 > > CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.2.0+ #35 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > <IRQ> > __dump_stack /lib/dump_stack.c:77 [inline] > dump_stack+0x1d8/0x2f8 /lib/dump_stack.c:113 > print_address_description+0x75/0x5b0 /mm/kasan/report.c:351 > __kasan_report+0x14b/0x1c0 /mm/kasan/report.c:482 > kasan_report+0x26/0x50 /mm/kasan/common.c:612 > check_memory_region_inline /mm/kasan/generic.c:182 [inline] > check_memory_region+0x2cf/0x2e0 /mm/kasan/generic.c:192 > __kasan_check_read+0x11/0x20 /mm/kasan/common.c:92 > atomic_read /./include/asm-generic/atomic-instrumented.h:26 [inline] > refcount_inc_not_zero_checked+0x7c/0x280 /lib/refcount.c:123 > refcount_inc_checked+0x15/0x50 /lib/refcount.c:156 > sock_hold /./include/net/sock.h:649 [inline] > sk_add_node /./include/net/sock.h:701 [inline] > nr_insert_socket /net/netrom/af_netrom.c:137 [inline] > nr_rx_frame+0x17bc/0x1e40 /net/netrom/af_netrom.c:1023 > nr_loopback_timer+0x6a/0x140 /net/netrom/nr_loopback.c:59 > call_timer_fn+0xec/0x200 /kernel/time/timer.c:1322 > expire_timers /kernel/time/timer.c:1366 [inline] > __run_timers+0x7cd/0x9c0 /kernel/time/timer.c:1685 > run_timer_softirq+0x4a/0x90 /kernel/time/timer.c:1698 > __do_softirq+0x333/0x7c4 /./arch/x86/include/asm/paravirt.h:777 > invoke_softirq /kernel/softirq.c:373 [inline] > irq_exit+0x227/0x230 /kernel/softirq.c:413 > exiting_irq /./arch/x86/include/asm/apic.h:537 [inline] > smp_apic_timer_interrupt+0x113/0x280 /arch/x86/kernel/apic/apic.c:1095 > apic_timer_interrupt+0xf/0x20 /arch/x86/entry/entry_64.S:828 > </IRQ> > RIP: 0010:native_safe_halt+0xe/0x10 /./arch/x86/include/asm/irqflags.h:61 > Code: 06 fa eb ae 89 d9 80 e1 07 80 c1 03 38 c1 7c ba 48 89 df e8 c4 41 06 > fa eb b0 90 90 e9 07 00 00 00 0f 00 2d 76 67 56 00 fb f4 <c3> 90 e9 07 00 > 00 00 0f 00 2d 66 67 56 00 f4 c3 90 90 55 48 89 e5 > RSP: 0018:ffff8880a98cfd38 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 > RAX: 1ffffffff11950db RBX: ffff8880a98bc340 RCX: dffffc0000000000 > RDX: 0000000000000000 RSI: ffffffff812d193a RDI: ffff8880a98bcb78 > RBP: ffff8880a98cfd40 R08: ffff8880a98bcb90 R09: ffffed1015317869 > R10: ffffed1015317869 R11: 0000000000000000 R12: 0000000000000001 > R13: 1ffff11015317868 R14: dffffc0000000000 R15: dffffc0000000000 > arch_cpu_idle+0xa/0x10 /arch/x86/kernel/process.c:571 > default_idle_call+0x59/0xa0 /kernel/sched/idle.c:94 > cpuidle_idle_call /kernel/sched/idle.c:154 [inline] > do_idle+0x180/0x780 /kernel/sched/idle.c:263 > cpu_startup_entry+0x25/0x30 /kernel/sched/idle.c:354 > start_secondary+0x3f4/0x490 /arch/x86/kernel/smpboot.c:264 > secondary_startup_64+0xa4/0xb0 /arch/x86/kernel/head_64.S:243 > > Allocated by task 0: > save_stack /mm/kasan/common.c:69 [inline] > set_track /mm/kasan/common.c:77 [inline] > __kasan_kmalloc+0x11c/0x1b0 /mm/kasan/common.c:487 > kasan_kmalloc+0x9/0x10 /mm/kasan/common.c:501 > __do_kmalloc /mm/slab.c:3655 [inline] > __kmalloc+0x254/0x340 /mm/slab.c:3664 > kmalloc /./include/linux/slab.h:557 [inline] > sk_prot_alloc+0xb0/0x290 /net/core/sock.c:1603 > sk_alloc+0x38/0x950 /net/core/sock.c:1657 > nr_make_new /net/netrom/af_netrom.c:476 [inline] > nr_rx_frame+0xabc/0x1e40 /net/netrom/af_netrom.c:959 > nr_loopback_timer+0x6a/0x140 /net/netrom/nr_loopback.c:59 > call_timer_fn+0xec/0x200 /kernel/time/timer.c:1322 > expire_timers /kernel/time/timer.c:1366 [inline] > __run_timers+0x7cd/0x9c0 /kernel/time/timer.c:1685 > run_timer_softirq+0x4a/0x90 /kernel/time/timer.c:1698 > __do_softirq+0x333/0x7c4 /./arch/x86/include/asm/paravirt.h:777 > > Freed by task 4044: > save_stack /mm/kasan/common.c:69 [inline] > set_track /mm/kasan/common.c:77 [inline] > __kasan_slab_free+0x12a/0x1e0 /mm/kasan/common.c:449 > kasan_slab_free+0xe/0x10 /mm/kasan/common.c:457 > __cache_free /mm/slab.c:3425 [inline] > kfree+0x115/0x200 /mm/slab.c:3756 > sk_prot_free /net/core/sock.c:1640 [inline] > __sk_destruct+0x567/0x660 /net/core/sock.c:1726 > sk_destruct /net/core/sock.c:1734 [inline] > __sk_free+0x317/0x3e0 /net/core/sock.c:1745 > sk_free /net/core/sock.c:1756 [inline] > sock_put /./include/net/sock.h:1725 [inline] > sock_efree+0x60/0x80 /net/core/sock.c:2042 > skb_release_head_state+0x100/0x220 /net/core/skbuff.c:652 > skb_release_all /net/core/skbuff.c:663 [inline] > __kfree_skb+0x25/0x170 /net/core/skbuff.c:679 > kfree_skb+0x6f/0xb0 /net/core/skbuff.c:697 > nr_accept+0x4ef/0x650 /net/netrom/af_netrom.c:819 > __sys_accept4+0x5bc/0x9a0 /net/socket.c:1750 > __do_sys_accept /net/socket.c:1791 [inline] > __se_sys_accept /net/socket.c:1788 [inline] > __x64_sys_accept+0x7d/0x90 /net/socket.c:1788 > do_syscall_64+0xfe/0x140 /arch/x86/entry/common.c:296 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > The buggy address belongs to the object at ffff88808ee52000 > which belongs to the cache kmalloc-2k of size 2048 > The buggy address is located 128 bytes inside of > 2048-byte region [ffff88808ee52000, ffff88808ee52800) > The buggy address belongs to the page: > page:ffffea00023b9480 refcount:1 mapcount:0 mapping:ffff8880aa400e00 > index:0xffff88808ee53100 compound_mapcount: 0 > flags: 0x1fffc0000010200(slab|head) > raw: 01fffc0000010200 ffffea0001732108 ffffea00025f5588 ffff8880aa400e00 > raw: ffff88808ee53100 ffff88808ee52000 0000000100000002 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff88808ee51f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff88808ee52000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ffff88808ee52080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff88808ee52100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88808ee52180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ================================================================== > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/000000000000e42667058e554371%40google.com.
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