KASAN: slab-out-of-bounds Read in bitmap_port_gc

From: syzbot
Date: Sat Jan 18 2020 - 11:37:19 EST

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Hello,

syzbot found the following crash on:

HEAD commit: 25e73aad Merge tag 'io_uring-5.5-2020-01-16' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1788b166e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=d9290aeb7e6cf1c4
dashboard link: https://syzkaller.appspot.com/bug?extid=53cdd0ec0bbabd53370a
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16da6faee00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=115e8faee00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+53cdd0ec0bbabd53370a@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
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_port_gc_test net/netfilter/ipset/ip_set_bitmap_port.c:67 [inline]
BUG: KASAN: slab-out-of-bounds in bitmap_port_gc+0x112/0x4f0 net/netfilter/ipset/ip_set_bitmap_gen.h:277
Read of size 8 at addr ffff8880a3f9abc0 by task syz-executor663/10036

CPU: 0 PID: 10036 Comm: syz-executor663 Not tainted 5.5.0-rc6-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_port_gc_test net/netfilter/ipset/ip_set_bitmap_port.c:67 [inline]
bitmap_port_gc+0x112/0x4f0 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:write_comp_data+0x1e/0x70 kernel/kcov.c:208
Code: 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 c0 1e 02 00 65 8b 05 a8 28 8d 7e a9 00 01 1f 00 75 51 41 8b 80 80 13 00 00 <83> f8 03 75 45 49 8b 80 88 13 00 00 45 8b 80 84 13 00 00 4c 8b 08
RSP: 0000:ffffc90003777e00 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff819ffb83
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000005
RBP: ffffc90003777e08 R08: ffff88808f8e6040 R09: fffffbfff165e7ae
R10: ffff88808f8e68d8 R11: ffff88808f8e6040 R12: 0000000000000001
R13: 00000000006cb090 R14: dffffc0000000000 R15: ffff888095bf7000
vmacache_find+0x243/0x310 mm/vmacache.c:85
find_vma+0x23/0x170 mm/mmap.c:2223
do_user_addr_fault arch/x86/mm/fault.c:1402 [inline]
__do_page_fault+0x37a/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: 0033:0x400702
Code: 01 00 00 00 e8 ef 09 00 00 31 c0 b9 0c 00 00 00 ba 03 00 00 00 be 10 00 00 00 bf 29 00 00 00 e8 84 0c 04 00 48 83 f8 ff 74 07 <48> 89 05 87 a9 2c 00 48 b8 62 69 74 6d 61 70 3a 70 48 c7 04 25 40
RSP: 002b:00007fffcf827620 EFLAGS: 00010213
RAX: 0000000000000003 RBX: 0000000000000000 RCX: 0000000000441399
RDX: 000000000000000c RSI: 0000000000000003 RDI: 0000000000000010
RBP: 00000000000185b9 R08: 0000000000000004 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004021c0
R13: 0000000000402250 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 9665:
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_port net/netfilter/ipset/ip_set_bitmap_port.c:234 [inline]
bitmap_port_create+0x3dc/0x7c0 net/netfilter/ipset/ip_set_bitmap_port.c:276
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+0x58c/0x7d0 net/netlink/af_netlink.c:1328
netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:639 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:659
____sys_sendmsg+0x753/0x880 net/socket.c:2330
___sys_sendmsg+0x100/0x170 net/socket.c:2384
__sys_sendmsg+0x105/0x1d0 net/socket.c:2417
__do_sys_sendmsg net/socket.c:2426 [inline]
__se_sys_sendmsg net/socket.c:2424 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2424
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 9391:
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:3356 [inline]
path_openat+0x118b/0x3180 fs/namei.c:3473
do_filp_open+0x1a1/0x280 fs/namei.c:3503
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 ffff8880a3f9abc0
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
32-byte region [ffff8880a3f9abc0, ffff8880a3f9abe0)
The buggy address belongs to the page:
page:ffffea00028fe680 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff8880a3f9afc1
raw: 00fffe0000000200 ffffea00025ac3c8 ffffea0002a00088 ffff8880aa4001c0
raw: ffff8880a3f9afc1 ffff8880a3f9a000 000000010000002f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff8880a3f9aa80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
ffff8880a3f9ab00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8880a3f9ab80: fb fb fb fb fc fc fc fc 04 fc fc fc fc fc fc fc
^
ffff8880a3f9ac00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
ffff8880a3f9ac80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================

---
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