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* KASAN: use-after-free Read in blk_update_request
@ 2020-11-14 11:18 syzbot
  2021-02-21  1:28 ` syzbot
  0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2020-11-14 11:18 UTC (permalink / raw)
  To: andrii, ast, axboe, bpf, daniel, john.fastabend, kafai, kpsingh,
	linux-block, linux-kernel, netdev, songliubraving,
	syzkaller-bugs, yhs

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@syzkaller.appspotmail.com

==================================================================
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
==================================================================


---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: KASAN: use-after-free Read in blk_update_request
  2020-11-14 11:18 KASAN: use-after-free Read in blk_update_request syzbot
@ 2021-02-21  1:28 ` syzbot
  0 siblings, 0 replies; 2+ messages in thread
From: syzbot @ 2021-02-21  1:28 UTC (permalink / raw)
  To: andrii, ast, axboe, bpf, daniel, john.fastabend, kafai, kpsingh,
	kpsingh, linux-block, linux-kernel, netdev, songliubraving,
	syzkaller-bugs, yhs

syzbot has found a reproducer for the following issue on:

HEAD commit:    f40ddce8 Linux 5.11
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1156374ad00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4b919ebed7b4902
dashboard link: https://syzkaller.appspot.com/bug?extid=a3f809f70c0f239cda46
compiler:       Debian clang version 11.0.1-2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=143ee67ad00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1585d40cd00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a3f809f70c0f239cda46@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in debug_spin_unlock kernel/locking/spinlock_debug.c:97 [inline]
BUG: KASAN: use-after-free in do_raw_spin_unlock+0x481/0x8a0 kernel/locking/spinlock_debug.c:138
Read of size 4 at addr ffff888020c03154 by task ksoftirqd/0/12

CPU: 0 PID: 12 Comm: ksoftirqd/0 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x137/0x1be lib/dump_stack.c:120
 print_address_description+0x5f/0x3a0 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report+0x15e/0x200 mm/kasan/report.c:413
 debug_spin_unlock kernel/locking/spinlock_debug.c:97 [inline]
 do_raw_spin_unlock+0x481/0x8a0 kernel/locking/spinlock_debug.c:138
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:159 [inline]
 _raw_spin_unlock_irqrestore+0x20/0x60 kernel/locking/spinlock.c:191
 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
 __wake_up_common_lock kernel/sched/wait.c:140 [inline]
 __wake_up+0xe2/0x140 kernel/sched/wait.c:157
 req_bio_endio block/blk-core.c:264 [inline]
 blk_update_request+0x7f7/0x14f0 block/blk-core.c:1462
 blk_mq_end_request+0x39/0x70 block/blk-mq.c:564
 blk_done_softirq+0x2fd/0x380 block/blk-mq.c:588
 __do_softirq+0x318/0x714 kernel/softirq.c:343
 run_ksoftirqd+0x63/0xa0 kernel/softirq.c:650
 smpboot_thread_fn+0x572/0x970 kernel/smpboot.c:165
 kthread+0x39a/0x3c0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Allocated by task 8906:
 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:401 [inline]
 ____kasan_kmalloc+0xbd/0xf0 mm/kasan/common.c:429
 kasan_kmalloc include/linux/kasan.h:219 [inline]
 kmem_cache_alloc_trace+0x200/0x300 mm/slub.c:2919
 kmalloc include/linux/slab.h:552 [inline]
 lbmLogInit fs/jfs/jfs_logmgr.c:1829 [inline]
 lmLogInit+0x26e/0x1530 fs/jfs/jfs_logmgr.c:1278
 open_inline_log fs/jfs/jfs_logmgr.c:1183 [inline]
 lmLogOpen+0x4c6/0xeb0 fs/jfs/jfs_logmgr.c:1077
 jfs_mount_rw+0x91/0x4a0 fs/jfs/jfs_mount.c:259
 jfs_fill_super+0x57e/0x960 fs/jfs/super.c:571
 mount_bdev+0x26c/0x3a0 fs/super.c:1366
 legacy_get_tree+0xea/0x180 fs/fs_context.c:592
 vfs_get_tree+0x86/0x270 fs/super.c:1496
 do_new_mount fs/namespace.c:2881 [inline]
 path_mount+0x17ad/0x2a00 fs/namespace.c:3211
 do_mount fs/namespace.c:3224 [inline]
 __do_sys_mount fs/namespace.c:3432 [inline]
 __se_sys_mount+0x28c/0x320 fs/namespace.c:3409
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 8906:
 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:356
 ____kasan_slab_free+0xe2/0x110 mm/kasan/common.c:362
 kasan_slab_free include/linux/kasan.h:192 [inline]
 slab_free_hook mm/slub.c:1547 [inline]
 slab_free_freelist_hook+0xd6/0x1a0 mm/slub.c:1580
 slab_free mm/slub.c:3143 [inline]
 kfree+0xd1/0x2a0 mm/slub.c:4139
 lbmLogShutdown fs/jfs/jfs_logmgr.c:1872 [inline]
 lmLogInit+0xfb5/0x1530 fs/jfs/jfs_logmgr.c:1423
 open_inline_log fs/jfs/jfs_logmgr.c:1183 [inline]
 lmLogOpen+0x4c6/0xeb0 fs/jfs/jfs_logmgr.c:1077
 jfs_mount_rw+0x91/0x4a0 fs/jfs/jfs_mount.c:259
 jfs_fill_super+0x57e/0x960 fs/jfs/super.c:571
 mount_bdev+0x26c/0x3a0 fs/super.c:1366
 legacy_get_tree+0xea/0x180 fs/fs_context.c:592
 vfs_get_tree+0x86/0x270 fs/super.c:1496
 do_new_mount fs/namespace.c:2881 [inline]
 path_mount+0x17ad/0x2a00 fs/namespace.c:3211
 do_mount fs/namespace.c:3224 [inline]
 __do_sys_mount fs/namespace.c:3432 [inline]
 __se_sys_mount+0x28c/0x320 fs/namespace.c:3409
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Last potentially related work creation:
 kasan_save_stack+0x27/0x50 mm/kasan/common.c:38
 kasan_record_aux_stack+0xcc/0x100 mm/kasan/generic.c:344
 insert_work+0x54/0x400 kernel/workqueue.c:1331
 __queue_work+0x97f/0xcc0 kernel/workqueue.c:1497
 queue_work_on+0xc1/0x120 kernel/workqueue.c:1524
 queue_work include/linux/workqueue.h:507 [inline]
 call_usermodehelper_exec+0x206/0x3d0 kernel/umh.c:433
 kobject_uevent_env+0x1349/0x1730 lib/kobject_uevent.c:617
 kobject_synth_uevent+0x368/0x8a0 lib/kobject_uevent.c:208
 uevent_store+0x47/0x70 drivers/base/bus.c:585
 kernfs_fop_write_iter+0x3b6/0x510 fs/kernfs/file.c:296
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x896/0xab0 fs/read_write.c:605
 ksys_write+0x11b/0x220 fs/read_write.c:658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888020c03100
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 84 bytes inside of
 192-byte region [ffff888020c03100, ffff888020c031c0)
The buggy address belongs to the page:
page:000000004af063c2 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x20c03
flags: 0xfff00000000200(slab)
raw: 00fff00000000200 ffffea000083b4c0 0000000300000003 ffff888011041500
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888020c03000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888020c03080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888020c03100: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff888020c03180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888020c03200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


^ permalink raw reply	[flat|nested] 2+ messages in thread

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2020-11-14 11:18 KASAN: use-after-free Read in blk_update_request syzbot
2021-02-21  1:28 ` syzbot

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