* KASAN: invalid-free in tcf_exts_destroy
@ 2020-03-08 19:35 syzbot
2020-03-10 18:33 ` Cong Wang
2020-03-11 1:17 ` Cong Wang
0 siblings, 2 replies; 6+ messages in thread
From: syzbot @ 2020-03-08 19:35 UTC (permalink / raw)
To: davem, jhs, jiri, kuba, linux-kernel, netdev, syzkaller-bugs,
xiyou.wangcong
Hello,
syzbot found the following crash on:
HEAD commit: c2003765 Merge tag 'io_uring-5.6-2020-03-07' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10cd2ae3e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=4527d1e2fb19fd5c
dashboard link: https://syzkaller.appspot.com/bug?extid=dcc34d54d68ef7d2d53d
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
userspace arch: i386
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1561b01de00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15aad2f9e00000
The bug was bisected to:
commit 599be01ee567b61f4471ee8078870847d0a11e8e
Author: Cong Wang <xiyou.wangcong@gmail.com>
Date: Mon Feb 3 05:14:35 2020 +0000
net_sched: fix an OOB access in cls_tcindex
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10a275fde00000
final crash: https://syzkaller.appspot.com/x/report.txt?x=12a275fde00000
console output: https://syzkaller.appspot.com/x/log.txt?x=14a275fde00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+dcc34d54d68ef7d2d53d@syzkaller.appspotmail.com
Fixes: 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex")
IPVS: ftp: loaded support on port[0] = 21
==================================================================
BUG: KASAN: double-free or invalid-free in tcf_exts_destroy+0x62/0xc0 net/sched/cls_api.c:3002
CPU: 1 PID: 9507 Comm: syz-executor467 Not tainted 5.6.0-rc4-syzkaller #0
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+0x188/0x20d lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:374
kasan_report_invalid_free+0x61/0xa0 mm/kasan/report.c:468
__kasan_slab_free+0x129/0x140 mm/kasan/common.c:455
__cache_free mm/slab.c:3426 [inline]
kfree+0x109/0x2b0 mm/slab.c:3757
tcf_exts_destroy+0x62/0xc0 net/sched/cls_api.c:3002
tcf_exts_change+0xf4/0x150 net/sched/cls_api.c:3059
tcindex_set_parms+0xed8/0x1a00 net/sched/cls_tcindex.c:456
tcindex_change+0x203/0x2e0 net/sched/cls_tcindex.c:518
tc_new_tfilter+0xa59/0x20b0 net/sched/cls_api.c:2103
rtnetlink_rcv_msg+0x810/0xad0 net/core/rtnetlink.c:5427
netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2478
netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329
netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6b9/0x7d0 net/socket.c:2343
___sys_sendmsg+0x100/0x170 net/socket.c:2397
__sys_sendmsg+0xec/0x1b0 net/socket.c:2430
do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
do_fast_syscall_32+0x270/0xe8f arch/x86/entry/common.c:408
entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
Allocated by task 1:
save_stack+0x1b/0x80 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
__kasan_kmalloc mm/kasan/common.c:515 [inline]
__kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:488
kmem_cache_alloc_trace+0x153/0x7d0 mm/slab.c:3551
kmalloc include/linux/slab.h:555 [inline]
kzalloc include/linux/slab.h:669 [inline]
__class_register+0x46/0x450 drivers/base/class.c:160
spi_transport_init+0xf0/0x132 drivers/scsi/scsi_transport_spi.c:1609
do_one_initcall+0x10a/0x7d0 init/main.c:1152
do_initcall_level init/main.c:1225 [inline]
do_initcalls init/main.c:1241 [inline]
do_basic_setup init/main.c:1261 [inline]
kernel_init_freeable+0x501/0x5ae init/main.c:1445
kernel_init+0xd/0x1bb init/main.c:1352
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Freed by task 0:
(stack is not available)
The buggy address belongs to the object at ffff8880a12d5000
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 152 bytes inside of
1024-byte region [ffff8880a12d5000, ffff8880a12d5400)
The buggy address belongs to the page:
page:ffffea000284b540 refcount:1 mapcount:0 mapping:ffff8880aa000c40 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea000285c288 ffffea000284b588 ffff8880aa000c40
raw: 0000000000000000 ffff8880a12d5000 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a12d4f80: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880a12d5000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880a12d5080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
^
ffff8880a12d5100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8880a12d5180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
---
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.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: KASAN: invalid-free in tcf_exts_destroy
2020-03-08 19:35 KASAN: invalid-free in tcf_exts_destroy syzbot
@ 2020-03-10 18:33 ` Cong Wang
2020-03-10 20:36 ` Eric Dumazet
2020-03-11 1:17 ` Cong Wang
1 sibling, 1 reply; 6+ messages in thread
From: Cong Wang @ 2020-03-10 18:33 UTC (permalink / raw)
To: syzbot
Cc: David Miller, Jamal Hadi Salim, Jiri Pirko, Jakub Kicinski, LKML,
Linux Kernel Network Developers, syzkaller-bugs
On Sun, Mar 8, 2020 at 12:35 PM syzbot
<syzbot+dcc34d54d68ef7d2d53d@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: c2003765 Merge tag 'io_uring-5.6-2020-03-07' of git://git...
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=10cd2ae3e00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=4527d1e2fb19fd5c
> dashboard link: https://syzkaller.appspot.com/bug?extid=dcc34d54d68ef7d2d53d
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> userspace arch: i386
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1561b01de00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15aad2f9e00000
>
> The bug was bisected to:
>
> commit 599be01ee567b61f4471ee8078870847d0a11e8e
> Author: Cong Wang <xiyou.wangcong@gmail.com>
> Date: Mon Feb 3 05:14:35 2020 +0000
>
> net_sched: fix an OOB access in cls_tcindex
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10a275fde00000
> final crash: https://syzkaller.appspot.com/x/report.txt?x=12a275fde00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=14a275fde00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+dcc34d54d68ef7d2d53d@syzkaller.appspotmail.com
> Fixes: 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex")
>
> IPVS: ftp: loaded support on port[0] = 21
> ==================================================================
> BUG: KASAN: double-free or invalid-free in tcf_exts_destroy+0x62/0xc0 net/sched/cls_api.c:3002
>
> CPU: 1 PID: 9507 Comm: syz-executor467 Not tainted 5.6.0-rc4-syzkaller #0
> 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+0x188/0x20d lib/dump_stack.c:118
> print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:374
> kasan_report_invalid_free+0x61/0xa0 mm/kasan/report.c:468
> __kasan_slab_free+0x129/0x140 mm/kasan/common.c:455
> __cache_free mm/slab.c:3426 [inline]
> kfree+0x109/0x2b0 mm/slab.c:3757
> tcf_exts_destroy+0x62/0xc0 net/sched/cls_api.c:3002
> tcf_exts_change+0xf4/0x150 net/sched/cls_api.c:3059
> tcindex_set_parms+0xed8/0x1a00 net/sched/cls_tcindex.c:456
Looks like a consequence of "slab-out-of-bounds Write in tcindex_set_parms".
Thanks.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: KASAN: invalid-free in tcf_exts_destroy
2020-03-10 18:33 ` Cong Wang
@ 2020-03-10 20:36 ` Eric Dumazet
2020-03-10 22:02 ` Cong Wang
0 siblings, 1 reply; 6+ messages in thread
From: Eric Dumazet @ 2020-03-10 20:36 UTC (permalink / raw)
To: Cong Wang, syzbot
Cc: David Miller, Jamal Hadi Salim, Jiri Pirko, Jakub Kicinski, LKML,
Linux Kernel Network Developers, syzkaller-bugs
On 3/10/20 11:33 AM, Cong Wang wrote:
> On Sun, Mar 8, 2020 at 12:35 PM syzbot
> <syzbot+dcc34d54d68ef7d2d53d@syzkaller.appspotmail.com> wrote:
>>
>> Hello,
>>
>> syzbot found the following crash on:
>>
>> HEAD commit: c2003765 Merge tag 'io_uring-5.6-2020-03-07' of git://git...
>> git tree: upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=10cd2ae3e00000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=4527d1e2fb19fd5c
>> dashboard link: https://syzkaller.appspot.com/bug?extid=dcc34d54d68ef7d2d53d
>> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
>> userspace arch: i386
>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1561b01de00000
>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15aad2f9e00000
>>
>> The bug was bisected to:
>>
>> commit 599be01ee567b61f4471ee8078870847d0a11e8e
>> Author: Cong Wang <xiyou.wangcong@gmail.com>
>> Date: Mon Feb 3 05:14:35 2020 +0000
>>
>> net_sched: fix an OOB access in cls_tcindex
>>
>> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10a275fde00000
>> final crash: https://syzkaller.appspot.com/x/report.txt?x=12a275fde00000
>> console output: https://syzkaller.appspot.com/x/log.txt?x=14a275fde00000
>>
>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> Reported-by: syzbot+dcc34d54d68ef7d2d53d@syzkaller.appspotmail.com
>> Fixes: 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex")
>>
>> IPVS: ftp: loaded support on port[0] = 21
>> ==================================================================
>> BUG: KASAN: double-free or invalid-free in tcf_exts_destroy+0x62/0xc0 net/sched/cls_api.c:3002
>>
>> CPU: 1 PID: 9507 Comm: syz-executor467 Not tainted 5.6.0-rc4-syzkaller #0
>> 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+0x188/0x20d lib/dump_stack.c:118
>> print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:374
>> kasan_report_invalid_free+0x61/0xa0 mm/kasan/report.c:468
>> __kasan_slab_free+0x129/0x140 mm/kasan/common.c:455
>> __cache_free mm/slab.c:3426 [inline]
>> kfree+0x109/0x2b0 mm/slab.c:3757
>> tcf_exts_destroy+0x62/0xc0 net/sched/cls_api.c:3002
>> tcf_exts_change+0xf4/0x150 net/sched/cls_api.c:3059
>> tcindex_set_parms+0xed8/0x1a00 net/sched/cls_tcindex.c:456
>
> Looks like a consequence of "slab-out-of-bounds Write in tcindex_set_parms".
>
> Thanks.
>
I have a dozen more syzbot reports involving net/sched code, do you want
me to release them right now ?
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: KASAN: invalid-free in tcf_exts_destroy
2020-03-10 20:36 ` Eric Dumazet
@ 2020-03-10 22:02 ` Cong Wang
0 siblings, 0 replies; 6+ messages in thread
From: Cong Wang @ 2020-03-10 22:02 UTC (permalink / raw)
To: Eric Dumazet
Cc: syzbot, David Miller, Jamal Hadi Salim, Jiri Pirko,
Jakub Kicinski, LKML, Linux Kernel Network Developers,
syzkaller-bugs
On Tue, Mar 10, 2020 at 1:36 PM Eric Dumazet <eric.dumazet@gmail.com> wrote:
>
>
>
> On 3/10/20 11:33 AM, Cong Wang wrote:
> > On Sun, Mar 8, 2020 at 12:35 PM syzbot
> > <syzbot+dcc34d54d68ef7d2d53d@syzkaller.appspotmail.com> wrote:
> >>
> >> Hello,
> >>
> >> syzbot found the following crash on:
> >>
> >> HEAD commit: c2003765 Merge tag 'io_uring-5.6-2020-03-07' of git://git...
> >> git tree: upstream
> >> console output: https://syzkaller.appspot.com/x/log.txt?x=10cd2ae3e00000
> >> kernel config: https://syzkaller.appspot.com/x/.config?x=4527d1e2fb19fd5c
> >> dashboard link: https://syzkaller.appspot.com/bug?extid=dcc34d54d68ef7d2d53d
> >> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> >> userspace arch: i386
> >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1561b01de00000
> >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15aad2f9e00000
> >>
> >> The bug was bisected to:
> >>
> >> commit 599be01ee567b61f4471ee8078870847d0a11e8e
> >> Author: Cong Wang <xiyou.wangcong@gmail.com>
> >> Date: Mon Feb 3 05:14:35 2020 +0000
> >>
> >> net_sched: fix an OOB access in cls_tcindex
> >>
> >> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10a275fde00000
> >> final crash: https://syzkaller.appspot.com/x/report.txt?x=12a275fde00000
> >> console output: https://syzkaller.appspot.com/x/log.txt?x=14a275fde00000
> >>
> >> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> >> Reported-by: syzbot+dcc34d54d68ef7d2d53d@syzkaller.appspotmail.com
> >> Fixes: 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex")
> >>
> >> IPVS: ftp: loaded support on port[0] = 21
> >> ==================================================================
> >> BUG: KASAN: double-free or invalid-free in tcf_exts_destroy+0x62/0xc0 net/sched/cls_api.c:3002
> >>
> >> CPU: 1 PID: 9507 Comm: syz-executor467 Not tainted 5.6.0-rc4-syzkaller #0
> >> 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+0x188/0x20d lib/dump_stack.c:118
> >> print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:374
> >> kasan_report_invalid_free+0x61/0xa0 mm/kasan/report.c:468
> >> __kasan_slab_free+0x129/0x140 mm/kasan/common.c:455
> >> __cache_free mm/slab.c:3426 [inline]
> >> kfree+0x109/0x2b0 mm/slab.c:3757
> >> tcf_exts_destroy+0x62/0xc0 net/sched/cls_api.c:3002
> >> tcf_exts_change+0xf4/0x150 net/sched/cls_api.c:3059
> >> tcindex_set_parms+0xed8/0x1a00 net/sched/cls_tcindex.c:456
> >
> > Looks like a consequence of "slab-out-of-bounds Write in tcindex_set_parms".
> >
> > Thanks.
> >
>
> I have a dozen more syzbot reports involving net/sched code, do you want
> me to release them right now ?
I have no problem with this, at least I can close them as dup etc.. Please
go ahead.
Thanks.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: KASAN: invalid-free in tcf_exts_destroy
2020-03-08 19:35 KASAN: invalid-free in tcf_exts_destroy syzbot
2020-03-10 18:33 ` Cong Wang
@ 2020-03-11 1:17 ` Cong Wang
2020-03-11 5:14 ` syzbot
1 sibling, 1 reply; 6+ messages in thread
From: Cong Wang @ 2020-03-11 1:17 UTC (permalink / raw)
To: syzbot
Cc: David Miller, Jamal Hadi Salim, Jiri Pirko, Jakub Kicinski, LKML,
Linux Kernel Network Developers, syzkaller-bugs
#syz test: https://github.com/congwang/linux.git tcindex
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: KASAN: invalid-free in tcf_exts_destroy
2020-03-11 1:17 ` Cong Wang
@ 2020-03-11 5:14 ` syzbot
0 siblings, 0 replies; 6+ messages in thread
From: syzbot @ 2020-03-11 5:14 UTC (permalink / raw)
To: davem, jhs, jiri, kuba, linux-kernel, netdev, syzkaller-bugs,
xiyou.wangcong
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger crash:
Reported-and-tested-by: syzbot+dcc34d54d68ef7d2d53d@syzkaller.appspotmail.com
Tested on:
commit: 2c19e526 net_sched: hold rtnl lock for tcindex_partial_des..
git tree: https://github.com/congwang/linux.git tcindex
kernel config: https://syzkaller.appspot.com/x/.config?x=bcbe864577669742
dashboard link: https://syzkaller.appspot.com/bug?extid=dcc34d54d68ef7d2d53d
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
userspace arch: i386
Note: testing is done by a robot and is best-effort only.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2020-03-11 5:14 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-03-08 19:35 KASAN: invalid-free in tcf_exts_destroy syzbot
2020-03-10 18:33 ` Cong Wang
2020-03-10 20:36 ` Eric Dumazet
2020-03-10 22:02 ` Cong Wang
2020-03-11 1:17 ` Cong Wang
2020-03-11 5:14 ` syzbot
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