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KASAN: global-out-of-bounds Read in macvlan_hard_header

Status: auto-closed as invalid on 2020/10/15 18:25
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+5136f0bd2e0d6cfdd3bd@syzkaller.appspotmail.com
First crash: 1942d, last: 1942d
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: global-out-of-bounds Read in macvlan_hard_header (2) net 17 1 1494d 1494d 0/29 auto-closed as invalid on 2022/02/05 22:58
upstream KASAN: global-out-of-bounds Read in macvlan_hard_header (4) net 17 1 932d 829d 0/29 auto-obsoleted due to no activity on 2023/09/18 12:55
upstream KASAN: global-out-of-bounds Read in macvlan_hard_header (3) net 17 1 1221d 1217d 0/29 auto-obsoleted due to no activity on 2022/12/06 01:42

Sample crash report:
==================================================================
BUG: KASAN: global-out-of-bounds in dev_hard_header include/linux/netdevice.h:3046 [inline]
BUG: KASAN: global-out-of-bounds in macvlan_hard_header+0x12b/0x150 drivers/net/macvlan.c:589
Read of size 8 at addr ffffffff8bf75650 by task syz-executor.0/6868

CPU: 0 PID: 6868 Comm: syz-executor.0 Not tainted 5.8.0-next-20200814-syzkaller #0
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+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0x5/0x497 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 dev_hard_header include/linux/netdevice.h:3046 [inline]
 macvlan_hard_header+0x12b/0x150 drivers/net/macvlan.c:589
 dev_hard_header include/linux/netdevice.h:3049 [inline]
 neigh_resolve_output net/core/neighbour.c:1484 [inline]
 neigh_resolve_output+0x39e/0x6a0 net/core/neighbour.c:1469
 neigh_output include/net/neighbour.h:509 [inline]
 ip6_finish_output2+0x8b6/0x17b0 net/ipv6/ip6_output.c:117
 __ip6_finish_output net/ipv6/ip6_output.c:143 [inline]
 __ip6_finish_output+0x447/0xab0 net/ipv6/ip6_output.c:128
 ip6_finish_output+0x34/0x1f0 net/ipv6/ip6_output.c:153
 NF_HOOK_COND include/linux/netfilter.h:290 [inline]
 ip6_output+0x1db/0x520 net/ipv6/ip6_output.c:176
 dst_output include/net/dst.h:443 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 NF_HOOK include/linux/netfilter.h:295 [inline]
 mld_sendpack+0x92a/0xdb0 net/ipv6/mcast.c:1679
 mld_send_cr net/ipv6/mcast.c:1975 [inline]
 mld_ifc_timer_expire+0x60a/0xf10 net/ipv6/mcast.c:2474
 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413
 expire_timers kernel/time/timer.c:1458 [inline]
 __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755
 __run_timers kernel/time/timer.c:1736 [inline]
 run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768
 __do_softirq+0x2de/0xa24 kernel/softirq.c:298
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x1f3/0x230 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4b/0x80 kernel/locking/spinlock.c:199
Code: c0 18 35 b6 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d b6 8d bf 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 bb 0b 59 f9 65 8b 05 04 57 0b 78 85 c0 74 02 5d
RSP: 0018:ffffc900051e76a8 EFLAGS: 00000286
RAX: 1ffffffff136c6a3 RBX: ffff8880a43ca3c0 RCX: 0000000000000006
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff87f6a73f
RBP: ffff8880ae635e00 R08: 0000000000000001 R09: ffffffff8c68b9f7
R10: fffffbfff18d173e R11: 0000000000000000 R12: ffff8880ae635e00
R13: ffff88803db90140 R14: 0000000000000000 R15: 0000000000000001
 finish_lock_switch kernel/sched/core.c:3517 [inline]
 finish_task_switch+0x147/0x750 kernel/sched/core.c:3617
 context_switch kernel/sched/core.c:3781 [inline]
 __schedule+0x8ed/0x21e0 kernel/sched/core.c:4527
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:4683
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:40
 __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:183
 spin_unlock include/linux/spinlock.h:394 [inline]
 copy_pte_range mm/memory.c:863 [inline]
 copy_pmd_range mm/memory.c:903 [inline]
 copy_pud_range mm/memory.c:937 [inline]
 copy_p4d_range mm/memory.c:959 [inline]
 copy_page_range+0x14f4/0x26a0 mm/memory.c:1021
 dup_mmap kernel/fork.c:592 [inline]
 dup_mm+0x98f/0x1300 kernel/fork.c:1353
 copy_mm kernel/fork.c:1409 [inline]
 copy_process+0x28e4/0x6920 kernel/fork.c:2068
 _do_fork+0xe8/0xb10 kernel/fork.c:2427
 __do_sys_clone+0xc8/0x110 kernel/fork.c:2544
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45b80a
Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 0c 25 10 00 00 00 31 d2 4d 8d 91 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 f5 00 00 00 85 c0 41 89 c5 0f 85 fc 00 00
RSP: 002b:00007ffd38d87300 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffd38d87300 RCX: 000000000045b80a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffd38d87340 R08: 0000000000000001 R09: 00000000034d5940
R10: 00000000034d5c10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffd38d87390

The buggy address belongs to the variable:
 nr_free_chain_hlocks+0x30/0x40

Memory state around the buggy address:
 ffffffff8bf75500: 00 00 f9 f9 f9 f9 f9 f9 00 00 00 00 00 00 00 00
 ffffffff8bf75580: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9
>ffffffff8bf75600: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9
                                                 ^
 ffffffff8bf75680: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff8bf75700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/08/16 18:24 linux-next 4993e4fe12af 424dd8e7 .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.