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Message-ID: <000000000000717523059c6cabc9@google.com>
Date: Sat, 18 Jan 2020 08:37:10 -0800
From: syzbot <syzbot+df0d0f5895ef1f41a65b@...kaller.appspotmail.com>
To: coreteam@...filter.org, davem@...emloft.net, fw@...len.de,
info@...ux.net, jeremy@...zel.net, kadlec@...filter.org,
kstewart@...uxfoundation.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
pablo@...filter.org, syzkaller-bugs@...glegroups.com,
tglx@...utronix.de
Subject: KASAN: slab-out-of-bounds Read in bitmap_ip_gc
Hello,
syzbot found the following crash on:
HEAD commit: 56f200c7 netns: Constify exported functions
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=178b74c9e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=66d8660c57ff3c98
dashboard link: https://syzkaller.appspot.com/bug?extid=df0d0f5895ef1f41a65b
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17d78966e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1375b1d1e00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+df0d0f5895ef1f41a65b@...kaller.appspotmail.com
==================================================================
BUG: KASAN: slab-out-of-bounds in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
BUG: KASAN: slab-out-of-bounds in bitmap_ip_gc_test net/netfilter/ipset/ip_set_bitmap_ip.c:76 [inline]
BUG: KASAN: slab-out-of-bounds in bitmap_ip_gc+0x100/0x4f0 net/netfilter/ipset/ip_set_bitmap_gen.h:277
Read of size 8 at addr ffff8880987e3280 by task syz-executor158/9973
CPU: 1 PID: 9973 Comm: syz-executor158 Not tainted 5.5.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__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_ip_gc_test net/netfilter/ipset/ip_set_bitmap_ip.c:76 [inline]
bitmap_ip_gc+0x100/0x4f0 net/netfilter/ipset/ip_set_bitmap_gen.h:277
call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404
expire_timers kernel/time/timer.c:1449 [inline]
__run_timers kernel/time/timer.c:1773 [inline]
__run_timers kernel/time/timer.c:1740 [inline]
run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786
__do_softirq+0x262/0x98c kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x19b/0x1e0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
</IRQ>
RIP: 0010:get_lock_parent_ip include/linux/ftrace.h:796 [inline]
RIP: 0010:preempt_latency_start kernel/sched/core.c:3765 [inline]
RIP: 0010:preempt_latency_start kernel/sched/core.c:3762 [inline]
RIP: 0010:preempt_count_add+0x7a/0x160 kernel/sched/core.c:3790
Code: b6 c0 3d f4 00 00 00 7f 7f 65 8b 05 a8 73 b1 7e 25 ff ff ff 7f 39 c3 74 05 5b 41 5c 5d c3 48 8b 5d 08 48 89 df e8 36 ba 0a 00 <85> c0 75 39 65 4c 8b 24 25 c0 1e 02 00 49 8d bc 24 58 12 00 00 48
RSP: 0000:ffffc900036b7b50 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffffffff81a1bea3 RCX: 1ffffffff16cec9c
RDX: 0000000000000000 RSI: ffffffff81a1be96 RDI: ffffffff81a1bea3
RBP: ffffc900036b7b60 R08: ffff888093e3c440 R09: ffffed1015d2703d
R10: ffffed1015d2703c R11: ffff8880ae9381e3 R12: 0000000000004d00
R13: 0000000000000134 R14: 0000000000000000 R15: 0000000000000000
kmap_atomic include/linux/highmem.h:93 [inline]
clear_user_highpage include/linux/highmem.h:160 [inline]
clear_subpage+0x23/0x110 mm/memory.c:4673
process_huge_page mm/memory.c:4627 [inline]
clear_huge_page+0xb5/0x3e0 mm/memory.c:4687
__do_huge_pmd_anonymous_page mm/huge_memory.c:596 [inline]
do_huge_pmd_anonymous_page+0x6a6/0x1a50 mm/huge_memory.c:764
create_huge_pmd mm/memory.c:3888 [inline]
__handle_mm_fault+0x3145/0x3cc0 mm/memory.c:4098
handle_mm_fault+0x3b2/0xa50 mm/memory.c:4164
do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
__do_page_fault+0x536/0xd80 arch/x86/mm/fault.c:1506
do_page_fault+0x38/0x590 arch/x86/mm/fault.c:1530
page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1203
RIP: 0033:0x400713
Code: 03 00 00 00 be 10 00 00 00 bf 29 00 00 00 e8 24 0d 04 00 48 83 f8 ff 74 07 48 89 05 87 a9 2c 00 48 b8 62 69 74 6d 61 70 3a 69 <48> c7 04 25 00 03 00 20 00 00 00 00 c7 04 25 08 03 00 20 00 00 00
RSP: 002b:00007ffee78cceb0 EFLAGS: 00010213
RAX: 693a70616d746962 RBX: 0000000000000000 RCX: 0000000000441439
RDX: 000000000000000c RSI: 0000000000000003 RDI: 0000000000000010
RBP: 000000000001ba88 R08: 0000000000000004 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402260
R13: 00000000004022f0 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 9616:
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_ip net/netfilter/ipset/ip_set_bitmap_ip.c:223 [inline]
bitmap_ip_create+0x6ec/0xc20 net/netfilter/ipset/ip_set_bitmap_ip.c:327
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 9337:
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
tomoyo_check_open_permission+0x19e/0x3e0 security/tomoyo/file.c:786
tomoyo_file_open security/tomoyo/tomoyo.c:319 [inline]
tomoyo_file_open+0xa9/0xd0 security/tomoyo/tomoyo.c:314
security_file_open+0x71/0x300 security/security.c:1497
do_dentry_open+0x37a/0x1380 fs/open.c:784
vfs_open+0xa0/0xd0 fs/open.c:914
do_last fs/namei.c:3420 [inline]
path_openat+0x10df/0x4500 fs/namei.c:3537
do_filp_open+0x1a1/0x280 fs/namei.c:3567
do_sys_open+0x3fe/0x5d0 fs/open.c:1097
__do_sys_open fs/open.c:1115 [inline]
__se_sys_open fs/open.c:1110 [inline]
__x64_sys_open+0x7e/0xc0 fs/open.c:1110
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 ffff8880987e3280
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
32-byte region [ffff8880987e3280, ffff8880987e32a0)
The buggy address belongs to the page:
page:ffffea000261f8c0 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff8880987e3fc1
raw: 00fffe0000000200 ffffea000287c788 ffffea00029a0648 ffff8880aa4001c0
raw: ffff8880987e3fc1 ffff8880987e3000 000000010000003f 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880987e3180: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
ffff8880987e3200: 00 03 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8880987e3280: 04 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
^
ffff8880987e3300: 00 03 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
ffff8880987e3380: fb fb fb fb fc fc fc fc fb fb fb fb 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@...glegroups.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
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