[syzbot] KASAN: use-after-free Write in _atomic_dec_and_lock_irqsave

From: syzbot
Date: Fri Aug 20 2021 - 06:48:21 EST

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Hello,

syzbot found the following issue on:

HEAD commit: d6d09a694205 Merge tag 'for-5.14-rc6-tag' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13e6c341300000
kernel config: https://syzkaller.appspot.com/x/.config?x=f61012d0b1cd846f
dashboard link: https://syzkaller.appspot.com/bug?extid=c59302ca1658701a11fc
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.1

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c59302ca1658701a11fc@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in atomic_add_unless include/asm-generic/atomic-instrumented.h:570 [inline]
BUG: KASAN: use-after-free in _atomic_dec_and_lock_irqsave+0x2f/0x150 lib/dec_and_lock.c:41
Write of size 4 at addr ffff88802a10111c by task ksoftirqd/1/19

CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.14.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1ae/0x29f lib/dump_stack.c:105
print_address_description+0x66/0x3b0 mm/kasan/report.c:233
__kasan_report mm/kasan/report.c:419 [inline]
kasan_report+0x163/0x210 mm/kasan/report.c:436
check_region_inline mm/kasan/generic.c:135 [inline]
kasan_check_range+0x2b5/0x2f0 mm/kasan/generic.c:189
instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
atomic_add_unless include/asm-generic/atomic-instrumented.h:570 [inline]
_atomic_dec_and_lock_irqsave+0x2f/0x150 lib/dec_and_lock.c:41
put_ucounts+0x7c/0x1a0 kernel/ucount.c:204
put_cred_rcu+0x221/0x400 kernel/cred.c:124
rcu_do_batch kernel/rcu/tree.c:2550 [inline]
rcu_core+0x906/0x14b0 kernel/rcu/tree.c:2785
__do_softirq+0x372/0x783 kernel/softirq.c:558
run_ksoftirqd+0xa2/0x100 kernel/softirq.c:920
smpboot_thread_fn+0x533/0x9d0 kernel/smpboot.c:164
kthread+0x453/0x480 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Allocated by task 20438:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc+0xc4/0xf0 mm/kasan/common.c:513
kasan_kmalloc include/linux/kasan.h:264 [inline]
kmem_cache_alloc_trace+0x96/0x340 mm/slub.c:2986
kmalloc include/linux/slab.h:591 [inline]
kzalloc include/linux/slab.h:721 [inline]
alloc_ucounts+0x1b1/0x5d0 kernel/ucount.c:173
set_cred_ucounts+0x220/0x2d0 kernel/cred.c:684
__sys_setresuid+0x6d5/0x920 kernel/sys.c:702
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 8456:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x3d/0x70 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0x109/0x150 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1628 [inline]
slab_free_freelist_hook+0x1d8/0x290 mm/slub.c:1653
slab_free mm/slub.c:3213 [inline]
kfree+0xcf/0x2e0 mm/slub.c:4267
put_ucounts+0x15c/0x1a0 kernel/ucount.c:207
put_cred_rcu+0x221/0x400 kernel/cred.c:124
rcu_do_batch kernel/rcu/tree.c:2550 [inline]
rcu_core+0x906/0x14b0 kernel/rcu/tree.c:2785
__do_softirq+0x372/0x783 kernel/softirq.c:558

Last potentially related work creation:
kasan_save_stack+0x27/0x50 mm/kasan/common.c:38
kasan_record_aux_stack+0xee/0x120 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:3029 [inline]
call_rcu+0x1a0/0xa20 kernel/rcu/tree.c:3109
inetdev_destroy net/ipv4/devinet.c:325 [inline]
inetdev_event+0x79a/0x14d0 net/ipv4/devinet.c:1598
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:410
call_netdevice_notifiers_info net/core/dev.c:2123 [inline]
call_netdevice_notifiers_extack net/core/dev.c:2135 [inline]
call_netdevice_notifiers net/core/dev.c:2149 [inline]
unregister_netdevice_many+0xf7e/0x1980 net/core/dev.c:11093
ip_tunnel_delete_nets+0x325/0x370 net/ipv4/ip_tunnel.c:1122
ops_exit_list net/core/net_namespace.c:178 [inline]
cleanup_net+0x7ec/0xc60 net/core/net_namespace.c:595
process_one_work+0x833/0x10c0 kernel/workqueue.c:2276
worker_thread+0xac1/0x1320 kernel/workqueue.c:2422
kthread+0x453/0x480 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Second to last potentially related work creation:
kasan_save_stack+0x27/0x50 mm/kasan/common.c:38
kasan_record_aux_stack+0xee/0x120 mm/kasan/generic.c:348
insert_work+0x54/0x400 kernel/workqueue.c:1332
__queue_work+0x928/0xc60 kernel/workqueue.c:1498
queue_work_on+0x111/0x200 kernel/workqueue.c:1525
queue_work include/linux/workqueue.h:507 [inline]
call_usermodehelper_exec+0x283/0x470 kernel/umh.c:435
kobject_uevent_env+0x1337/0x1700 lib/kobject_uevent.c:618
netdev_queue_add_kobject net/core/net-sysfs.c:1621 [inline]
netdev_queue_update_kobjects+0x1c6/0x400 net/core/net-sysfs.c:1655
register_queue_kobjects net/core/net-sysfs.c:1716 [inline]
netdev_register_kobject+0x263/0x310 net/core/net-sysfs.c:1959
register_netdevice+0x12a1/0x1c20 net/core/dev.c:10349
register_netdev+0x37/0x50 net/core/dev.c:10473
sixpack_open+0x5be/0x9e0 drivers/net/hamradio/6pack.c:623
tty_ldisc_open drivers/tty/tty_ldisc.c:449 [inline]
tty_set_ldisc+0x530/0x950 drivers/tty/tty_ldisc.c:579
tiocsetd drivers/tty/tty_io.c:2455 [inline]
tty_ioctl+0x1394/0x1720 drivers/tty/tty_io.c:2741
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:1069 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:1055
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff88802a101100
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 28 bytes inside of
192-byte region [ffff88802a101100, ffff88802a1011c0)
The buggy address belongs to the page:
page:ffffea0000a84040 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2a101
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea00005d2100 0000000900000007 ffff888011041a00
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 8456, ts 148626461315, free_ts 148608362928
prep_new_page mm/page_alloc.c:2436 [inline]
get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4169
__alloc_pages+0x26c/0x5f0 mm/page_alloc.c:5391
alloc_slab_page mm/slub.c:1691 [inline]
allocate_slab+0xf1/0x540 mm/slub.c:1831
new_slab mm/slub.c:1894 [inline]
new_slab_objects mm/slub.c:2640 [inline]
___slab_alloc+0x1cf/0x350 mm/slub.c:2803
__slab_alloc mm/slub.c:2843 [inline]
slab_alloc_node mm/slub.c:2925 [inline]
slab_alloc mm/slub.c:2967 [inline]
kmem_cache_alloc_trace+0x29d/0x340 mm/slub.c:2984
kmalloc include/linux/slab.h:591 [inline]
netdevice_queue_work drivers/infiniband/core/roce_gid_mgmt.c:643 [inline]
netdevice_event+0x3af/0x970 drivers/infiniband/core/roce_gid_mgmt.c:802
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:410
__dev_notify_flags+0x306/0x5d0 net/core/dev.c:2123
dev_change_flags+0xe3/0x190 net/core/dev.c:8898
do_setlink+0xcbd/0x3f70 net/core/rtnetlink.c:2721
__rtnl_newlink net/core/rtnetlink.c:3393 [inline]
rtnl_newlink+0x16e4/0x1cd0 net/core/rtnetlink.c:3508
rtnetlink_rcv_msg+0x91c/0xe50 net/core/rtnetlink.c:5574
netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2504
netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
netlink_unicast+0x7de/0x9b0 net/netlink/af_netlink.c:1340
netlink_sendmsg+0x9e7/0xe00 net/netlink/af_netlink.c:1929
sock_sendmsg_nosec net/socket.c:703 [inline]
sock_sendmsg net/socket.c:723 [inline]
__sys_sendto+0x541/0x720 net/socket.c:2019
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1346 [inline]
free_pcp_prepare+0xc29/0xd20 mm/page_alloc.c:1397
free_unref_page_prepare mm/page_alloc.c:3332 [inline]
free_unref_page+0x7e/0x550 mm/page_alloc.c:3411
free_slab mm/slub.c:1934 [inline]
discard_slab mm/slub.c:1940 [inline]
__slab_free+0x5c0/0x6b0 mm/slub.c:3143
do_slab_free mm/slub.c:3201 [inline]
___cache_free+0xfc/0x120 mm/slub.c:3220
qlist_free_all mm/kasan/quarantine.c:165 [inline]
kasan_quarantine_reduce+0x151/0x1c0 mm/kasan/quarantine.c:272
__kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook mm/slab.h:519 [inline]
slab_alloc_node mm/slub.c:2959 [inline]
slab_alloc mm/slub.c:2967 [inline]
kmem_cache_alloc_trace+0x209/0x340 mm/slub.c:2984
kmalloc include/linux/slab.h:591 [inline]
kzalloc include/linux/slab.h:721 [inline]
ipv6_add_addr+0x408/0x1480 net/ipv6/addrconf.c:1083
add_addr+0x194/0x470 net/ipv6/addrconf.c:3077
addrconf_notify+0x179f/0x2110 net/ipv6/addrconf.c:3589
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:410
__dev_notify_flags+0x306/0x5d0 net/core/dev.c:2123
dev_change_flags+0xe3/0x190 net/core/dev.c:8898
do_setlink+0xcbd/0x3f70 net/core/rtnetlink.c:2721
__rtnl_newlink net/core/rtnetlink.c:3393 [inline]
rtnl_newlink+0x16e4/0x1cd0 net/core/rtnetlink.c:3508
rtnetlink_rcv_msg+0x91c/0xe50 net/core/rtnetlink.c:5574

Memory state around the buggy address:
ffff88802a101000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802a101080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff88802a101100: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802a101180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88802a101200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

---
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Next message: Chao Yu: "Re: [f2fs-dev] [PATCH v4 2/2] f2fs: introduce periodic iostat io latency traces"
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