KASAN: use-after-free Read in blk_update_request

From: syzbot
Date: Sat Nov 14 2020 - 06:18:44 EST


Hello,

syzbot found the following issue on:

HEAD commit: 407ab579 Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1532ba76500000
kernel config: https://syzkaller.appspot.com/x/.config?x=37bf5609aacce0b6
dashboard link: https://syzkaller.appspot.com/bug?extid=a3f809f70c0f239cda46
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b)

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+a3f809f70c0f239cda46@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x98/0x6250 kernel/locking/lockdep.c:4701
Read of size 8 at addr ffff8880119c1068 by task ksoftirqd/1/16

CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.10.0-rc3-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+0x137/0x1be lib/dump_stack.c:118
print_address_description+0x6c/0x660 mm/kasan/report.c:385
__kasan_report mm/kasan/report.c:545 [inline]
kasan_report+0x136/0x1e0 mm/kasan/report.c:562
__lock_acquire+0x98/0x6250 kernel/locking/lockdep.c:4701
lock_acquire+0x114/0x5e0 kernel/locking/lockdep.c:5436
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x73/0xa0 kernel/locking/spinlock.c:159
__wake_up_common_lock kernel/sched/wait.c:122 [inline]
__wake_up+0xb8/0x140 kernel/sched/wait.c:142
req_bio_endio block/blk-core.c:263 [inline]
blk_update_request+0x7b7/0x1510 block/blk-core.c:1467
blk_mq_end_request+0x39/0x70 block/blk-mq.c:562
blk_done_softirq+0x2fd/0x380 block/blk-mq.c:586
__do_softirq+0x307/0x6be kernel/softirq.c:298
run_ksoftirqd+0x63/0xa0 kernel/softirq.c:653
smpboot_thread_fn+0x572/0x970 kernel/smpboot.c:165
kthread+0x36b/0x390 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Allocated by task 32733:
kasan_save_stack mm/kasan/common.c:48 [inline]
kasan_set_track mm/kasan/common.c:56 [inline]
__kasan_kmalloc+0x111/0x140 mm/kasan/common.c:461
kmem_cache_alloc_trace+0x14b/0x250 mm/slub.c:2918
kmalloc include/linux/slab.h:552 [inline]
lbmLogInit fs/jfs/jfs_logmgr.c:1829 [inline]
lmLogInit+0x26f/0x1750 fs/jfs/jfs_logmgr.c:1278
open_inline_log fs/jfs/jfs_logmgr.c:1183 [inline]
lmLogOpen+0x4a9/0xe50 fs/jfs/jfs_logmgr.c:1077
jfs_mount_rw+0x92/0x4a0 fs/jfs/jfs_mount.c:259
jfs_fill_super+0x592/0x9a0 fs/jfs/super.c:571
mount_bdev+0x24f/0x360 fs/super.c:1419
legacy_get_tree+0xea/0x180 fs/fs_context.c:592
vfs_get_tree+0x88/0x270 fs/super.c:1549
do_new_mount fs/namespace.c:2875 [inline]
path_mount+0x17b4/0x2a20 fs/namespace.c:3205
do_mount fs/namespace.c:3218 [inline]
__do_sys_mount fs/namespace.c:3426 [inline]
__se_sys_mount+0x28c/0x320 fs/namespace.c:3403
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 32733:
kasan_save_stack mm/kasan/common.c:48 [inline]
kasan_set_track+0x3d/0x70 mm/kasan/common.c:56
kasan_set_free_info+0x17/0x30 mm/kasan/generic.c:355
__kasan_slab_free+0x108/0x140 mm/kasan/common.c:422
slab_free_hook mm/slub.c:1544 [inline]
slab_free_freelist_hook+0xd6/0x1a0 mm/slub.c:1577
slab_free mm/slub.c:3142 [inline]
kfree+0xd1/0x280 mm/slub.c:4124
lbmLogShutdown fs/jfs/jfs_logmgr.c:1872 [inline]
lmLogInit+0x1195/0x1750 fs/jfs/jfs_logmgr.c:1423
open_inline_log fs/jfs/jfs_logmgr.c:1183 [inline]
lmLogOpen+0x4a9/0xe50 fs/jfs/jfs_logmgr.c:1077
jfs_mount_rw+0x92/0x4a0 fs/jfs/jfs_mount.c:259
jfs_fill_super+0x592/0x9a0 fs/jfs/super.c:571
mount_bdev+0x24f/0x360 fs/super.c:1419
legacy_get_tree+0xea/0x180 fs/fs_context.c:592
vfs_get_tree+0x88/0x270 fs/super.c:1549
do_new_mount fs/namespace.c:2875 [inline]
path_mount+0x17b4/0x2a20 fs/namespace.c:3205
do_mount fs/namespace.c:3218 [inline]
__do_sys_mount fs/namespace.c:3426 [inline]
__se_sys_mount+0x28c/0x320 fs/namespace.c:3403
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9

Last call_rcu():
kasan_save_stack+0x27/0x50 mm/kasan/common.c:48
kasan_record_aux_stack+0xc7/0x100 mm/kasan/generic.c:346
__call_rcu kernel/rcu/tree.c:2953 [inline]
call_rcu+0x10f/0x820 kernel/rcu/tree.c:3027
inetdev_destroy net/ipv4/devinet.c:325 [inline]
inetdev_event+0x730/0x14a0 net/ipv4/devinet.c:1599
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:2035 [inline]
call_netdevice_notifiers_extack net/core/dev.c:2047 [inline]
call_netdevice_notifiers net/core/dev.c:2061 [inline]
rollback_registered_many+0xeb8/0x16c0 net/core/dev.c:9422
rollback_registered net/core/dev.c:9467 [inline]
unregister_netdevice_queue+0x2f3/0x4b0 net/core/dev.c:10607
unregister_netdevice include/linux/netdevice.h:2824 [inline]
__tun_detach+0x646/0x1d40 drivers/net/tun.c:673
tun_detach drivers/net/tun.c:690 [inline]
tun_chr_close+0xed/0x130 drivers/net/tun.c:3390
__fput+0x34f/0x7b0 fs/file_table.c:281
task_work_run+0x137/0x1c0 kernel/task_work.c:151
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop kernel/entry/common.c:164 [inline]
exit_to_user_mode_prepare+0xe4/0x170 kernel/entry/common.c:191
syscall_exit_to_user_mode+0x4a/0x170 kernel/entry/common.c:266
entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff8880119c1000
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 104 bytes inside of
192-byte region [ffff8880119c1000, ffff8880119c10c0)
The buggy address belongs to the page:
page:00000000fe180338 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x119c1
flags: 0xfff00000000200(slab)
raw: 00fff00000000200 ffffea000044d6c0 0000000600000006 ffff888010441500
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff8880119c0f00: fc fc fc fc 00 00 00 00 00 00 00 fc fc fc fc fb
ffff8880119c0f80: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
>ffff8880119c1000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880119c1080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8880119c1100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================


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