* KASAN: null-ptr-deref Read in ip6_hold_safe
@ 2019-01-14 6:52 syzbot
2019-01-14 6:55 ` Dmitry Vyukov
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2019-01-14 6:52 UTC (permalink / raw)
To: davem, kuznet, linux-kernel, netdev, syzkaller-bugs, yoshfuji
Hello,
syzbot found the following crash on:
HEAD commit: b71acb0e3721 Merge branch 'linus' of git://git.kernel.org/..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1492759f400000
kernel config: https://syzkaller.appspot.com/x/.config?x=b03c5892bb940c76
dashboard link: https://syzkaller.appspot.com/bug?extid=8433ca0841e308ef4cc7
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+8433ca0841e308ef4cc7@syzkaller.appspotmail.com
kernel msg: ebtables bug: please report to author: EBT_ENTRY_OR_ENTRIES
shouldn't be set in distinguisher
==================================================================
BUG: KASAN: null-ptr-deref in atomic_read
include/asm-generic/atomic-instrumented.h:21 [inline]
BUG: KASAN: null-ptr-deref in atomic_fetch_add_unless
include/linux/atomic.h:575 [inline]
BUG: KASAN: null-ptr-deref in atomic_add_unless include/linux/atomic.h:597
[inline]
BUG: KASAN: null-ptr-deref in dst_hold_safe include/net/dst.h:308 [inline]
BUG: KASAN: null-ptr-deref in ip6_hold_safe+0xca/0x620 net/ipv6/route.c:1021
Read of size 4 at addr 0000000000000068 by task syz-executor4/21421
CPU: 0 PID: 21421 Comm: syz-executor4 Not tainted 4.20.0+ #3
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+0x1db/0x2d0 lib/dump_stack.c:113
kasan_report_error mm/kasan/report.c:352 [inline]
kasan_report mm/kasan/report.c:412 [inline]
kasan_report.cold+0x19f/0x2ba mm/kasan/report.c:396
check_memory_region_inline mm/kasan/kasan.c:260 [inline]
check_memory_region+0x123/0x190 mm/kasan/kasan.c:267
kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272
atomic_read include/asm-generic/atomic-instrumented.h:21 [inline]
atomic_fetch_add_unless include/linux/atomic.h:575 [inline]
atomic_add_unless include/linux/atomic.h:597 [inline]
dst_hold_safe include/net/dst.h:308 [inline]
ip6_hold_safe+0xca/0x620 net/ipv6/route.c:1021
rt6_get_pcpu_route net/ipv6/route.c:1241 [inline]
ip6_pol_route+0x3a3/0x1490 net/ipv6/route.c:1890
ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2066
fib6_rule_lookup+0x277/0x870 net/ipv6/fib6_rules.c:122
ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2095
ip6_route_output include/net/ip6_route.h:88 [inline]
ip6_dst_lookup_tail+0xe18/0x1d50 net/ipv6/ip6_output.c:958
ip6_dst_lookup_flow+0xca/0x270 net/ipv6/ip6_output.c:1086
ip6_sk_dst_lookup_flow net/ipv6/ip6_output.c:1124 [inline]
ip6_sk_dst_lookup_flow+0x5d6/0xbf0 net/ipv6/ip6_output.c:1114
udpv6_sendmsg+0x20d7/0x3550 net/ipv6/udp.c:1441
inet_sendmsg+0x1af/0x740 net/ipv4/af_inet.c:798
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xdd/0x130 net/socket.c:631
___sys_sendmsg+0x7ec/0x910 net/socket.c:2116
__sys_sendmsg+0x112/0x270 net/socket.c:2154
__do_sys_sendmsg net/socket.c:2163 [inline]
__se_sys_sendmsg net/socket.c:2161 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161
protocol 88fb is buggy, dev hsr_slave_0
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
protocol 88fb is buggy, dev hsr_slave_1
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457ec9
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb05ac4ac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9
RDX: 0000000000000000 RSI: 0000000020013000 RDI: 0000000000000004
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb05ac4b6d4
R13: 00000000004c4d2e R14: 00000000004d8650 R15: 00000000ffffffff
==================================================================
---
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.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: KASAN: null-ptr-deref Read in ip6_hold_safe
2019-01-14 6:52 KASAN: null-ptr-deref Read in ip6_hold_safe syzbot
@ 2019-01-14 6:55 ` Dmitry Vyukov
0 siblings, 0 replies; 2+ messages in thread
From: Dmitry Vyukov @ 2019-01-14 6:55 UTC (permalink / raw)
To: syzbot
Cc: David Miller, Alexey Kuznetsov, LKML, netdev, syzkaller-bugs,
Hideaki YOSHIFUJI, Wei Wang
On Mon, Jan 14, 2019 at 7:52 AM syzbot
<syzbot+8433ca0841e308ef4cc7@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: b71acb0e3721 Merge branch 'linus' of git://git.kernel.org/..
> git tree: net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=1492759f400000
> kernel config: https://syzkaller.appspot.com/x/.config?x=b03c5892bb940c76
> dashboard link: https://syzkaller.appspot.com/bug?extid=8433ca0841e308ef4cc7
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+8433ca0841e308ef4cc7@syzkaller.appspotmail.com
+Wei
> kernel msg: ebtables bug: please report to author: EBT_ENTRY_OR_ENTRIES
> shouldn't be set in distinguisher
> ==================================================================
> BUG: KASAN: null-ptr-deref in atomic_read
> include/asm-generic/atomic-instrumented.h:21 [inline]
> BUG: KASAN: null-ptr-deref in atomic_fetch_add_unless
> include/linux/atomic.h:575 [inline]
> BUG: KASAN: null-ptr-deref in atomic_add_unless include/linux/atomic.h:597
> [inline]
> BUG: KASAN: null-ptr-deref in dst_hold_safe include/net/dst.h:308 [inline]
> BUG: KASAN: null-ptr-deref in ip6_hold_safe+0xca/0x620 net/ipv6/route.c:1021
> Read of size 4 at addr 0000000000000068 by task syz-executor4/21421
>
> CPU: 0 PID: 21421 Comm: syz-executor4 Not tainted 4.20.0+ #3
> 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+0x1db/0x2d0 lib/dump_stack.c:113
> kasan_report_error mm/kasan/report.c:352 [inline]
> kasan_report mm/kasan/report.c:412 [inline]
> kasan_report.cold+0x19f/0x2ba mm/kasan/report.c:396
> check_memory_region_inline mm/kasan/kasan.c:260 [inline]
> check_memory_region+0x123/0x190 mm/kasan/kasan.c:267
> kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272
> atomic_read include/asm-generic/atomic-instrumented.h:21 [inline]
> atomic_fetch_add_unless include/linux/atomic.h:575 [inline]
> atomic_add_unless include/linux/atomic.h:597 [inline]
> dst_hold_safe include/net/dst.h:308 [inline]
> ip6_hold_safe+0xca/0x620 net/ipv6/route.c:1021
> rt6_get_pcpu_route net/ipv6/route.c:1241 [inline]
> ip6_pol_route+0x3a3/0x1490 net/ipv6/route.c:1890
> ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2066
> fib6_rule_lookup+0x277/0x870 net/ipv6/fib6_rules.c:122
> ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2095
> ip6_route_output include/net/ip6_route.h:88 [inline]
> ip6_dst_lookup_tail+0xe18/0x1d50 net/ipv6/ip6_output.c:958
> ip6_dst_lookup_flow+0xca/0x270 net/ipv6/ip6_output.c:1086
> ip6_sk_dst_lookup_flow net/ipv6/ip6_output.c:1124 [inline]
> ip6_sk_dst_lookup_flow+0x5d6/0xbf0 net/ipv6/ip6_output.c:1114
> udpv6_sendmsg+0x20d7/0x3550 net/ipv6/udp.c:1441
> inet_sendmsg+0x1af/0x740 net/ipv4/af_inet.c:798
> sock_sendmsg_nosec net/socket.c:621 [inline]
> sock_sendmsg+0xdd/0x130 net/socket.c:631
> ___sys_sendmsg+0x7ec/0x910 net/socket.c:2116
> __sys_sendmsg+0x112/0x270 net/socket.c:2154
> __do_sys_sendmsg net/socket.c:2163 [inline]
> __se_sys_sendmsg net/socket.c:2161 [inline]
> __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161
> protocol 88fb is buggy, dev hsr_slave_0
> do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
> protocol 88fb is buggy, dev hsr_slave_1
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x457ec9
> Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
> 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
> ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007fb05ac4ac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9
> RDX: 0000000000000000 RSI: 0000000020013000 RDI: 0000000000000004
> RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb05ac4b6d4
> R13: 00000000004c4d2e R14: 00000000004d8650 R15: 00000000ffffffff
> ==================================================================
>
>
> ---
> 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.
>
> --
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2019-01-14 6:52 KASAN: null-ptr-deref Read in ip6_hold_safe syzbot
2019-01-14 6:55 ` Dmitry Vyukov
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