syzbot


KASAN: stack-out-of-bounds Read in vmalloc_fault

Status: closed as dup on 2018/07/07 07:00
Subsystems: bridge netfilter
[Documentation on labels]
Reported-by: syzbot+7b269953d076326d7de0@syzkaller.appspotmail.com
First crash: 2331d, last: 2331d
Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
KASAN: stack-out-of-bounds Read in timerqueue_add kernel C 4 2317d 2333d
Discussions (1)
Title Replies (including bot) Last reply
KASAN: stack-out-of-bounds Read in vmalloc_fault 1 (2) 2018/07/07 07:00
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: stack-out-of-bounds Read in vmalloc_fault (2) x86 11 2166d 2201d 0/28 auto-closed as invalid on 2019/06/16 23:56

Sample crash report:
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready
8021q: adding VLAN 0 to HW filter on device team0
==================================================================
BUG: KASAN: stack-out-of-bounds in pgd_val arch/x86/include/asm/paravirt.h:412 [inline]
BUG: KASAN: stack-out-of-bounds in p4d_pfn arch/x86/include/asm/pgtable.h:205 [inline]
BUG: KASAN: stack-out-of-bounds in vmalloc_fault+0x743/0x760 arch/x86/mm/fault.c:462
Read of size 8 at addr ffff8801a936f160 by task ksoftirqd/0/9

CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 4.18.0-rc3+ #47
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+0x1c9/0x2b4 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 pgd_val arch/x86/include/asm/paravirt.h:412 [inline]
 p4d_pfn arch/x86/include/asm/pgtable.h:205 [inline]
 vmalloc_fault+0x743/0x760 arch/x86/mm/fault.c:462
 __do_page_fault+0x829/0xe50 arch/x86/mm/fault.c:1245
 do_page_fault+0xf6/0x8c0 arch/x86/mm/fault.c:1471
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1160
RIP: 0010:ebt_do_table+0x1a7/0x2170 net/bridge/netfilter/ebtables.c:208
Code: 24 04 4d 8d ac 24 80 00 00 00 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 8f 1e 00 00 <41> 8b 44 24 04 49 8d 7c 24 38 65 8b 15 28 7f 39 79 48 c1 e0 04 48 
RSP: 0018:ffff8801d9ab6ab8 EFLAGS: 00010246
RAX: 0000000000000007 RBX: 0000000000000005 RCX: ffffffff81601dff
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffc90001e2c004
RBP: ffff8801d9ab6c88 R08: ffffed003a6f4e49 R09: ffffed003a6f4e48
R10: ffffed003a6f4e48 R11: ffff8801d37a7243 R12: ffffc90001e2c000
R13: ffffc90001e2c080 R14: ffff8801d9ab6cc0 R15: ffff8801d9394380
 ebt_broute+0x200/0x340 net/bridge/netfilter/ebtable_broute.c:60
 br_handle_frame+0x6d1/0x1a20 net/bridge/br_input.c:292
 __netif_receive_skb_core.constprop.140+0x142d/0x3620 net/core/dev.c:4697
 __netif_receive_skb_one_core+0xd0/0x200 net/core/dev.c:4766
 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:4873
 process_backlog+0x219/0x760 net/core/dev.c:5676
 napi_poll net/core/dev.c:6088 [inline]
 net_rx_action+0x7a5/0x1950 net/core/dev.c:6154
 __do_softirq+0x2e8/0xb17 kernel/softirq.c:288
 run_ksoftirqd+0x86/0x100 kernel/softirq.c:649
 smpboot_thread_fn+0x417/0x870 kernel/smpboot.c:164
 kthread+0x345/0x410 kernel/kthread.c:240
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412

The buggy address belongs to the page:
page:ffffea0006a4dbc0 count:1 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 dead000000000100 dead000000000200 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801a936f000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801a936f080: 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f2 f2 f2 f2 00
>ffff8801a936f100: f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 f8
                                                       ^
 ffff8801a936f180: f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 00 00 00 00 00
 ffff8801a936f200: 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
2018/07/06 21:44 bpf-next 6fcf9b1d4d6c 9636bc93 .config console log report syz C ci-upstream-bpf-next-kasan-gce
* Struck through repros no longer work on HEAD.