From: syzbot <syzbot+33fc3ad6fa11675e1a7e@syzkaller.appspotmail.com>
To: coreteam@netfilter.org, davem@davemloft.net,
florent.fourcot@wifirst.fr, fw@strlen.de, jeremy@azazel.net,
johannes.berg@intel.com, kadlec@netfilter.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
netfilter-devel@vger.kernel.org, pablo@netfilter.org,
syzkaller-bugs@googlegroups.com
Subject: KASAN: use-after-free Read in bitmap_ipmac_ext_cleanup
Date: Sun, 19 Jan 2020 15:57:09 -0800 [thread overview]
Message-ID: <000000000000c7999e059c86eebe@google.com> (raw)
Hello,
syzbot found the following crash on:
HEAD commit: 7f013ede Merge git://git.kernel.org/pub/scm/linux/kernel/g..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=11c41495e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=66d8660c57ff3c98
dashboard link: https://syzkaller.appspot.com/bug?extid=33fc3ad6fa11675e1a7e
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15102cc9e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17e38faee00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+33fc3ad6fa11675e1a7e@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
BUG: KASAN: use-after-free in bitmap_ipmac_ext_cleanup+0xd8/0x290 net/netfilter/ipset/ip_set_bitmap_gen.h:51
Read of size 8 at addr ffff8880a2ac3a40 by task syz-executor324/9651
CPU: 0 PID: 9651 Comm: syz-executor324 Not tainted 5.5.0-rc5-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+0x197/0x210 lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
__kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
kasan_report+0x12/0x20 mm/kasan/common.c:639
check_memory_region_inline mm/kasan/generic.c:185 [inline]
check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
__kasan_check_read+0x11/0x20 mm/kasan/common.c:95
test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
bitmap_ipmac_ext_cleanup+0xd8/0x290 net/netfilter/ipset/ip_set_bitmap_gen.h:51
bitmap_ipmac_destroy+0x17c/0x1d0 net/netfilter/ipset/ip_set_bitmap_gen.h:65
ip_set_create+0xe47/0x1500 net/netfilter/ipset/ip_set_core.c:1165
nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229
netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
nfnetlink_rcv+0x1ba/0x460 net/netfilter/nfnetlink.c:563
netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1328
netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:672
____sys_sendmsg+0x753/0x880 net/socket.c:2343
___sys_sendmsg+0x100/0x170 net/socket.c:2397
__sys_sendmsg+0x105/0x1d0 net/socket.c:2430
__do_sys_sendmsg net/socket.c:2439 [inline]
__se_sys_sendmsg net/socket.c:2437 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x442239
Code: e8 6c aa 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffc7958b8c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442239
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003
RBP: 0000000000016edc R08: 00000000004030f0 R09: 00000000004030f0
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000403060
R13: 00000000004030f0 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 9651:
save_stack+0x23/0x90 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
__kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527
__do_kmalloc mm/slab.c:3656 [inline]
__kmalloc+0x163/0x770 mm/slab.c:3665
kmalloc include/linux/slab.h:561 [inline]
kzalloc include/linux/slab.h:670 [inline]
ip_set_alloc+0x38/0x5e net/netfilter/ipset/ip_set_core.c:255
init_map_ipmac net/netfilter/ipset/ip_set_bitmap_ipmac.c:302 [inline]
bitmap_ipmac_create+0x4e8/0xa00 net/netfilter/ipset/ip_set_bitmap_ipmac.c:365
ip_set_create+0x6f1/0x1500 net/netfilter/ipset/ip_set_core.c:1111
nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229
netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
nfnetlink_rcv+0x1ba/0x460 net/netfilter/nfnetlink.c:563
netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1328
netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:672
____sys_sendmsg+0x753/0x880 net/socket.c:2343
___sys_sendmsg+0x100/0x170 net/socket.c:2397
__sys_sendmsg+0x105/0x1d0 net/socket.c:2430
__do_sys_sendmsg net/socket.c:2439 [inline]
__se_sys_sendmsg net/socket.c:2437 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 9651:
save_stack+0x23/0x90 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
kasan_set_free_info mm/kasan/common.c:335 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:474
kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
__cache_free mm/slab.c:3426 [inline]
kfree+0x10a/0x2c0 mm/slab.c:3757
kvfree+0x61/0x70 mm/util.c:603
ip_set_free+0x16/0x20 net/netfilter/ipset/ip_set_core.c:276
bitmap_ipmac_destroy+0xae/0x1d0 net/netfilter/ipset/ip_set_bitmap_gen.h:63
ip_set_create+0xe47/0x1500 net/netfilter/ipset/ip_set_core.c:1165
nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229
netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
nfnetlink_rcv+0x1ba/0x460 net/netfilter/nfnetlink.c:563
netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1328
netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:672
____sys_sendmsg+0x753/0x880 net/socket.c:2343
___sys_sendmsg+0x100/0x170 net/socket.c:2397
__sys_sendmsg+0x105/0x1d0 net/socket.c:2430
__do_sys_sendmsg net/socket.c:2439 [inline]
__se_sys_sendmsg net/socket.c:2437 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8880a2ac3a40
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
32-byte region [ffff8880a2ac3a40, ffff8880a2ac3a60)
The buggy address belongs to the page:
page:ffffea00028ab0c0 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff8880a2ac3fc1
raw: 00fffe0000000200 ffffea000293f948 ffffea00025764c8 ffff8880aa4001c0
raw: ffff8880a2ac3fc1 ffff8880a2ac3000 000000010000003f 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a2ac3900: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
ffff8880a2ac3980: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8880a2ac3a00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
^
ffff8880a2ac3a80: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc
ffff8880a2ac3b00: fb fb fb fb fc fc fc fc 00 03 fc fc fc fc fc fc
==================================================================
---
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.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
next reply other threads:[~2020-01-19 23:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-19 23:57 syzbot [this message]
2020-01-20 23:16 ` KASAN: use-after-free Read in bitmap_ipmac_ext_cleanup syzbot
2020-02-19 15:46 ` syzbot
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