* KASAN: slab-out-of-bounds Read in _decode_session6 (2)
@ 2018-10-30 15:00 syzbot
2019-03-21 23:08 ` syzbot
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2018-10-30 15:00 UTC (permalink / raw)
To: davem, herbert, kuznet, linux-kernel, netdev, steffen.klassert,
syzkaller-bugs, yoshfuji
Hello,
syzbot found the following crash on:
HEAD commit: d8fd9e106fbc bpf: fix wrong helper enablement in cgroup lo..
git tree: bpf
console output: https://syzkaller.appspot.com/x/log.txt?x=174157cb400000
kernel config: https://syzkaller.appspot.com/x/.config?x=9cb981ee01463dea
dashboard link: https://syzkaller.appspot.com/bug?extid=240f9766d6be3d69431e
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10828e4d400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15fdf2eb400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+240f9766d6be3d69431e@syzkaller.appspotmail.com
IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
8021q: adding VLAN 0 to HW filter on device team0
==================================================================
BUG: KASAN: slab-out-of-bounds in _decode_session6+0x134a/0x1500
net/ipv6/xfrm6_policy.c:161
Read of size 1 at addr ffff8801ca971707 by task syz-executor081/5431
CPU: 0 PID: 5431 Comm: syz-executor081 Not tainted 4.19.0+ #72
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+0x244/0x39d lib/dump_stack.c:113
print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
__asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430
_decode_session6+0x134a/0x1500 net/ipv6/xfrm6_policy.c:161
__xfrm_decode_session+0x71/0x140 net/xfrm/xfrm_policy.c:2299
xfrm_decode_session include/net/xfrm.h:1232 [inline]
vti6_tnl_xmit+0x3fc/0x1c10 net/ipv6/ip6_vti.c:542
__netdev_start_xmit include/linux/netdevice.h:4336 [inline]
netdev_start_xmit include/linux/netdevice.h:4345 [inline]
xmit_one net/core/dev.c:3252 [inline]
dev_hard_start_xmit+0x295/0xc90 net/core/dev.c:3268
__dev_queue_xmit+0x2f71/0x3ad0 net/core/dev.c:3838
dev_queue_xmit+0x17/0x20 net/core/dev.c:3871
__bpf_tx_skb net/core/filter.c:2017 [inline]
__bpf_redirect_common net/core/filter.c:2055 [inline]
__bpf_redirect+0x5cf/0xb20 net/core/filter.c:2062
____bpf_clone_redirect net/core/filter.c:2095 [inline]
bpf_clone_redirect+0x2f6/0x490 net/core/filter.c:2067
bpf_prog_c39d1ba309a769f7+0x800/0x1000
Allocated by task 5431:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
__do_kmalloc_node mm/slab.c:3682 [inline]
__kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3696
__kmalloc_reserve.isra.40+0x41/0xe0 net/core/skbuff.c:137
pskb_expand_head+0x230/0x10f0 net/core/skbuff.c:1460
skb_ensure_writable+0x3dd/0x640 net/core/skbuff.c:5071
__bpf_try_make_writable net/core/filter.c:1638 [inline]
bpf_try_make_writable net/core/filter.c:1644 [inline]
bpf_try_make_head_writable net/core/filter.c:1652 [inline]
____bpf_clone_redirect net/core/filter.c:2089 [inline]
bpf_clone_redirect+0x14a/0x490 net/core/filter.c:2067
bpf_prog_c39d1ba309a769f7+0x800/0x1000
Freed by task 4022:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3498 [inline]
kfree+0xcf/0x230 mm/slab.c:3813
load_elf_binary+0x25b4/0x5620 fs/binfmt_elf.c:1118
search_binary_handler+0x17d/0x570 fs/exec.c:1653
exec_binprm fs/exec.c:1695 [inline]
__do_execve_file.isra.33+0x162f/0x2540 fs/exec.c:1819
do_execveat_common fs/exec.c:1866 [inline]
do_execve fs/exec.c:1883 [inline]
__do_sys_execve fs/exec.c:1964 [inline]
__se_sys_execve fs/exec.c:1959 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1959
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8801ca971500
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 7 bytes to the right of
512-byte region [ffff8801ca971500, ffff8801ca971700)
The buggy address belongs to the page:
page:ffffea00072a5c40 count:1 mapcount:0 mapping:ffff8801da800940 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffffea00072a6088 ffffea00072a7808 ffff8801da800940
raw: 0000000000000000 ffff8801ca971000 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801ca971600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8801ca971680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ffff8801ca971700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8801ca971780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8801ca971800: 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#bug-status-tracking for how to communicate with
syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: KASAN: slab-out-of-bounds Read in _decode_session6 (2)
2018-10-30 15:00 KASAN: slab-out-of-bounds Read in _decode_session6 (2) syzbot
@ 2019-03-21 23:08 ` syzbot
2019-03-21 23:21 ` Rafael J. Wysocki
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2019-03-21 23:08 UTC (permalink / raw)
To: bhelgaas, daniel, davem, devel, herbert, kuznet, lenb,
linux-acpi, linux-can, linux-kernel, linux-pci, lv.zheng, mkl,
netdev, rafael.j.wysocki, rjw, robert.moore, socketcan,
steffen.klassert, syzkaller-bugs, yoshfuji
syzbot has bisected this bug to:
commit 64fd1c7040880292710e6592ddc88d0d73cfb6fb
Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Date: Mon Jun 12 20:48:41 2017 +0000
ACPI / PM: Run wakeup notify handlers synchronously
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1555b12b200000
start commit: 64fd1c70 ACPI / PM: Run wakeup notify handlers synchronously
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=1755b12b200000
console output: https://syzkaller.appspot.com/x/log.txt?x=1355b12b200000
kernel config: https://syzkaller.appspot.com/x/.config?x=93932074d01b4a5
dashboard link: https://syzkaller.appspot.com/bug?extid=240f9766d6be3d69431e
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13f35e4d400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1280edbd400000
Reported-by: syzbot+240f9766d6be3d69431e@syzkaller.appspotmail.com
Fixes: 64fd1c704088 ("ACPI / PM: Run wakeup notify handlers synchronously")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: KASAN: slab-out-of-bounds Read in _decode_session6 (2)
2019-03-21 23:08 ` syzbot
@ 2019-03-21 23:21 ` Rafael J. Wysocki
0 siblings, 0 replies; 3+ messages in thread
From: Rafael J. Wysocki @ 2019-03-21 23:21 UTC (permalink / raw)
To: syzbot
Cc: Bjorn Helgaas, daniel, David Miller, devel, Herbert Xu, kuznet,
Len Brown, ACPI Devel Maling List, linux-can,
Linux Kernel Mailing List, Linux PCI, Lv, mkl, netdev,
Rafael Wysocki, Rafael J. Wysocki, Robert Moore, socketcan,
steffen.klassert, syzkaller-bugs, yoshfuji
On Fri, Mar 22, 2019 at 12:08 AM syzbot
<syzbot+240f9766d6be3d69431e@syzkaller.appspotmail.com> wrote:
>
> syzbot has bisected this bug to:
>
> commit 64fd1c7040880292710e6592ddc88d0d73cfb6fb
> Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Date: Mon Jun 12 20:48:41 2017 +0000
>
> ACPI / PM: Run wakeup notify handlers synchronously
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1555b12b200000
> start commit: 64fd1c70 ACPI / PM: Run wakeup notify handlers synchronously
> git tree: upstream
> final crash: https://syzkaller.appspot.com/x/report.txt?x=1755b12b200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1355b12b200000
> kernel config: https://syzkaller.appspot.com/x/.config?x=93932074d01b4a5
> dashboard link: https://syzkaller.appspot.com/bug?extid=240f9766d6be3d69431e
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13f35e4d400000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1280edbd400000
>
> Reported-by: syzbot+240f9766d6be3d69431e@syzkaller.appspotmail.com
> Fixes: 64fd1c704088 ("ACPI / PM: Run wakeup notify handlers synchronously")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
I don't see how the commit turned up by the bisection can be related
to the reported crash.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-10-30 15:00 KASAN: slab-out-of-bounds Read in _decode_session6 (2) syzbot
2019-03-21 23:08 ` syzbot
2019-03-21 23:21 ` Rafael J. Wysocki
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