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Message-ID: <001a1143c56ee814890563d9de79@google.com>
Date: Sun, 28 Jan 2018 09:58:02 -0800
From: syzbot <syzbot+7afeeb8e62e4716de370@...kaller.appspotmail.com>
To: coreteam@...filter.org, davem@...emloft.net, fw@...len.de,
kadlec@...ckhole.kfki.hu, kuznet@....inr.ac.ru,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
netfilter-devel@...r.kernel.org, pablo@...filter.org,
syzkaller-bugs@...glegroups.com, yoshfuji@...ux-ipv6.org
Subject: KASAN: slab-out-of-bounds Read in clusterip_tg_check
Hello,
syzbot hit the following crash on upstream commit
c4e0ca7fa24137e372d6135fe16e8df8e123f116 (Fri Jan 26 23:10:50 2018 +0000)
Merge tag 'riscv-for-linus-4.15-maintainers' of
git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux
So far this crash happened 5 times on net-next, upstream.
C reproducer is attached.
syzkaller reproducer is attached.
Raw console output is attached.
compiler: gcc (GCC) 7.1.1 20170620
.config is attached.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+7afeeb8e62e4716de370@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.
==================================================================
BUG: KASAN: slab-out-of-bounds in clusterip_config_init_nodelist
net/ipv4/netfilter/ipt_CLUSTERIP.c:172 [inline]
BUG: KASAN: slab-out-of-bounds in clusterip_config_init
net/ipv4/netfilter/ipt_CLUSTERIP.c:227 [inline]
BUG: KASAN: slab-out-of-bounds in clusterip_tg_check+0x150f/0x1570
net/ipv4/netfilter/ipt_CLUSTERIP.c:478
Read of size 2 at addr ffff8801d96d50c0 by task syzkaller761522/3685
CPU: 0 PID: 3685 Comm: syzkaller761522 Not tainted 4.15.0-rc9+ #283
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
print_address_description+0x73/0x250 mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report+0x25b/0x340 mm/kasan/report.c:409
__asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:428
clusterip_config_init_nodelist net/ipv4/netfilter/ipt_CLUSTERIP.c:172
[inline]
clusterip_config_init net/ipv4/netfilter/ipt_CLUSTERIP.c:227 [inline]
clusterip_tg_check+0x150f/0x1570 net/ipv4/netfilter/ipt_CLUSTERIP.c:478
xt_check_target+0x22c/0x7d0 net/netfilter/x_tables.c:845
check_target net/ipv4/netfilter/ip_tables.c:518 [inline]
find_check_entry.isra.8+0x8c8/0xcb0 net/ipv4/netfilter/ip_tables.c:559
translate_table+0xed1/0x1610 net/ipv4/netfilter/ip_tables.c:730
do_replace net/ipv4/netfilter/ip_tables.c:1148 [inline]
do_ipt_set_ctl+0x370/0x5f0 net/ipv4/netfilter/ip_tables.c:1682
nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1256
udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2408
sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968
SYSC_setsockopt net/socket.c:1831 [inline]
SyS_setsockopt+0x189/0x360 net/socket.c:1810
entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x440b49
RSP: 002b:00007ffca8f45648 EFLAGS: 00000203 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000440b49
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000006cb018 R08: 0000000000000320 R09: 0000000000000000
R10: 0000000020027000 R11: 0000000000000203 R12: 0000000000402470
R13: 0000000000402500 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 3685:
save_stack+0x43/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
__do_kmalloc_node mm/slab.c:3672 [inline]
__kmalloc_node+0x47/0x70 mm/slab.c:3679
kmalloc_node include/linux/slab.h:541 [inline]
kvmalloc_node+0x99/0xd0 mm/util.c:397
kvmalloc include/linux/mm.h:541 [inline]
xt_alloc_table_info+0x64/0xe0 net/netfilter/x_tables.c:1006
do_replace net/ipv4/netfilter/ip_tables.c:1137 [inline]
do_ipt_set_ctl+0x29b/0x5f0 net/ipv4/netfilter/ip_tables.c:1682
nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1256
udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2408
sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968
SYSC_setsockopt net/socket.c:1831 [inline]
SyS_setsockopt+0x189/0x360 net/socket.c:1810
entry_SYSCALL_64_fastpath+0x29/0xa0
Freed by task 0:
(stack is not available)
The buggy address belongs to the object at ffff8801d96d4dc0
which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 768 bytes inside of
1024-byte region [ffff8801d96d4dc0, ffff8801d96d51c0)
The buggy address belongs to the page:
page:ffffea000765b500 count:1 mapcount:0 mapping:ffff8801d96d4040 index:0x0
compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801d96d4040 0000000000000000 0000000100000007
raw: ffffea0006ebb120 ffffea0007641220 ffff8801dac00ac0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801d96d4f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8801d96d5000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ffff8801d96d5080: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
^
ffff8801d96d5100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8801d96d5180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@...glegroups.com.
syzbot will keep track of this bug report.
If you forgot to add the Reported-by tag, once the fix for this bug is
merged
into any tree, please reply to this email with:
#syz fix: exact-commit-title
If you want to test a patch for this bug, please reply with:
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Note: if the crash happens again, it will cause creation of a new bug
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View attachment "raw.log.txt" of type "text/plain" (10183 bytes)
View attachment "repro.syz.txt" of type "text/plain" (2809 bytes)
View attachment "repro.c.txt" of type "text/plain" (13382 bytes)
View attachment "config.txt" of type "text/plain" (135962 bytes)
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