syzbot


KASAN: global-out-of-bounds Read in macvlan_hard_header (2)

Status: auto-closed as invalid on 2022/02/05 22:58
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 383d, last: 383d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: global-out-of-bounds Read in macvlan_hard_header 1 832d 828d 0/24 auto-closed as invalid on 2020/10/15 18:25
upstream KASAN: global-out-of-bounds Read in macvlan_hard_header (3) 1 110d 106d 0/24 upstream: reported on 2022/08/12 09:35

Sample crash report:
==================================================================
BUG: KASAN: global-out-of-bounds in dev_hard_header include/linux/netdevice.h:3262 [inline]
BUG: KASAN: global-out-of-bounds in macvlan_hard_header+0x12b/0x150 drivers/net/macvlan.c:590
Read of size 8 at addr ffffffff8ef3c698 by task kworker/0:8/8513

CPU: 0 PID: 8513 Comm: kworker/0:8 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: mld mld_ifc_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0xf/0x309 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 dev_hard_header include/linux/netdevice.h:3262 [inline]
 macvlan_hard_header+0x12b/0x150 drivers/net/macvlan.c:590
 dev_hard_header include/linux/netdevice.h:3265 [inline]
 neigh_resolve_output net/core/neighbour.c:1518 [inline]
 neigh_resolve_output+0x4ac/0x820 net/core/neighbour.c:1503
 neigh_output include/net/neighbour.h:527 [inline]
 ip6_finish_output2+0x571/0x14e0 net/ipv6/ip6_output.c:126
 __ip6_finish_output net/ipv6/ip6_output.c:191 [inline]
 __ip6_finish_output+0x4c1/0x1050 net/ipv6/ip6_output.c:170
 ip6_finish_output+0x32/0x200 net/ipv6/ip6_output.c:201
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip6_output+0x1e4/0x530 net/ipv6/ip6_output.c:224
 dst_output include/net/dst.h:450 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 mld_sendpack+0x9a1/0xe40 net/ipv6/mcast.c:1826
 mld_send_cr net/ipv6/mcast.c:2127 [inline]
 mld_ifc_work+0x71c/0xdc0 net/ipv6/mcast.c:2659
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

The buggy address belongs to the variable:
 nr_zapped_lock_chains+0x18/0x40

Memory state around the buggy address:
 ffffffff8ef3c580: 00 00 00 00 f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9
 ffffffff8ef3c600: 04 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9
>ffffffff8ef3c680: 00 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 00 00 00 00
                            ^
 ffffffff8ef3c700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff8ef3c780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-net-kasan-gce 2021/11/07 22:48 net-next cc0356d6a02e 4c1be0be .config log report info KASAN: global-out-of-bounds Read in macvlan_hard_header
* Struck through repros no longer work on HEAD.