KASAN: use-after-free Read in debugfs_remove
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syzbot
Apr 17, 2019, 2:08:06 AM4/17/19
to syzkaller...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 1ec8f1f0 Linux 4.14.111
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14cc8db7200000
kernel config: https://syzkaller.appspot.com/x/.config?x=fdadf290ea9fc6f9
dashboard link: https://syzkaller.appspot.com/bug?extid=b995cedcc70f92f10fc4
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b995ce...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in debugfs_remove fs/debugfs/inode.c:657 [inline]
BUG: KASAN: use-after-free in debugfs_remove+0xfb/0x120
fs/debugfs/inode.c:649
Read of size 8 at addr ffff88807492e9e0 by task syz-executor.0/16255
CPU: 1 PID: 16255 Comm: syz-executor.0 Not tainted 4.14.111 #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x138/0x19c lib/dump_stack.c:53
print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report mm/kasan/report.c:409 [inline]
kasan_report.cold+0xaf/0x2b5 mm/kasan/report.c:393
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
debugfs_remove fs/debugfs/inode.c:657 [inline]
debugfs_remove+0xfb/0x120 fs/debugfs/inode.c:649
blk_trace_free+0x38/0x140 kernel/trace/blktrace.c:324
blk_trace_cleanup kernel/trace/blktrace.c:351 [inline]
blk_trace_remove+0x59/0x80 kernel/trace/blktrace.c:364
blk_trace_ioctl+0x21d/0x270 kernel/trace/blktrace.c:708
blkdev_ioctl+0x106/0x1880 block/ioctl.c:580
block_ioctl+0xde/0x120 fs/block_dev.c:1881
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7b9/0x1070 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x458c29
RSP: 002b:00007f568e66fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000005
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f568e6706d4
R13: 00000000004c012d R14: 00000000004d2540 R15: 00000000ffffffff
Allocated by task 16224:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc mm/kasan/kasan.c:551 [inline]
kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529
kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:489
kmem_cache_alloc+0x12e/0x780 mm/slab.c:3552
__d_alloc+0x2d/0x9f0 fs/dcache.c:1623
d_alloc+0x4d/0x270 fs/dcache.c:1710
__lookup_hash fs/namei.c:1570 [inline]
__lookup_hash+0x58/0x190 fs/namei.c:1562
lookup_one_len+0x281/0x3b0 fs/namei.c:2538
start_creating fs/debugfs/inode.c:309 [inline]
start_creating+0xa6/0x1b0 fs/debugfs/inode.c:285
__debugfs_create_file+0x53/0x3d0 fs/debugfs/inode.c:348
debugfs_create_file+0x5a/0x70 fs/debugfs/inode.c:399
do_blk_trace_setup+0x32d/0xb10 kernel/trace/blktrace.c:529
blk_trace_setup+0xbd/0x140 kernel/trace/blktrace.c:579
blk_trace_ioctl+0x147/0x270 kernel/trace/blktrace.c:694
blkdev_ioctl+0x106/0x1880 block/ioctl.c:580
block_ioctl+0xde/0x120 fs/block_dev.c:1881
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7b9/0x1070 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
Freed by task 7018:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3496 [inline]
kmem_cache_free+0x83/0x2b0 mm/slab.c:3758
__d_free+0x20/0x30 fs/dcache.c:270
__rcu_reclaim kernel/rcu/rcu.h:195 [inline]
rcu_do_batch kernel/rcu/tree.c:2699 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2929 [inline]
rcu_process_callbacks+0x7c0/0x12c0 kernel/rcu/tree.c:2946
__do_softirq+0x24e/0x9ae kernel/softirq.c:288
The buggy address belongs to the object at ffff88807492e9a0
which belongs to the cache dentry of size 288
The buggy address is located 64 bytes inside of
288-byte region [ffff88807492e9a0, ffff88807492eac0)
The buggy address belongs to the page:
page:ffffea0001d24b80 count:1 mapcount:0 mapping:ffff88807492e000 index:0x0
flags: 0x1fffc0000000100(slab)
raw: 01fffc0000000100 ffff88807492e000 0000000000000000 000000010000000b
raw: ffffea0002916c60 ffffea0002682920 ffff88821f8b5680 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88807492e880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88807492e900: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
> ffff88807492e980: fc fc fc fc fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807492ea00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807492ea80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
kobject: 'loop2' (ffff8880a49245e0): kobject_uevent_env
==================================================================
kobject: 'loop2' (ffff8880a49245e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
---
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 syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following crash on:
HEAD commit: 1ec8f1f0 Linux 4.14.111
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14cc8db7200000
kernel config: https://syzkaller.appspot.com/x/.config?x=fdadf290ea9fc6f9
dashboard link: https://syzkaller.appspot.com/bug?extid=b995cedcc70f92f10fc4
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b995ce...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in debugfs_remove fs/debugfs/inode.c:657 [inline]
BUG: KASAN: use-after-free in debugfs_remove+0xfb/0x120
fs/debugfs/inode.c:649
Read of size 8 at addr ffff88807492e9e0 by task syz-executor.0/16255
CPU: 1 PID: 16255 Comm: syz-executor.0 Not tainted 4.14.111 #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x138/0x19c lib/dump_stack.c:53
print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report mm/kasan/report.c:409 [inline]
kasan_report.cold+0xaf/0x2b5 mm/kasan/report.c:393
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
debugfs_remove fs/debugfs/inode.c:657 [inline]
debugfs_remove+0xfb/0x120 fs/debugfs/inode.c:649
blk_trace_free+0x38/0x140 kernel/trace/blktrace.c:324
blk_trace_cleanup kernel/trace/blktrace.c:351 [inline]
blk_trace_remove+0x59/0x80 kernel/trace/blktrace.c:364
blk_trace_ioctl+0x21d/0x270 kernel/trace/blktrace.c:708
blkdev_ioctl+0x106/0x1880 block/ioctl.c:580
block_ioctl+0xde/0x120 fs/block_dev.c:1881
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7b9/0x1070 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x458c29
RSP: 002b:00007f568e66fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000005
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f568e6706d4
R13: 00000000004c012d R14: 00000000004d2540 R15: 00000000ffffffff
Allocated by task 16224:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc mm/kasan/kasan.c:551 [inline]
kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529
kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:489
kmem_cache_alloc+0x12e/0x780 mm/slab.c:3552
__d_alloc+0x2d/0x9f0 fs/dcache.c:1623
d_alloc+0x4d/0x270 fs/dcache.c:1710
__lookup_hash fs/namei.c:1570 [inline]
__lookup_hash+0x58/0x190 fs/namei.c:1562
lookup_one_len+0x281/0x3b0 fs/namei.c:2538
start_creating fs/debugfs/inode.c:309 [inline]
start_creating+0xa6/0x1b0 fs/debugfs/inode.c:285
__debugfs_create_file+0x53/0x3d0 fs/debugfs/inode.c:348
debugfs_create_file+0x5a/0x70 fs/debugfs/inode.c:399
do_blk_trace_setup+0x32d/0xb10 kernel/trace/blktrace.c:529
blk_trace_setup+0xbd/0x140 kernel/trace/blktrace.c:579
blk_trace_ioctl+0x147/0x270 kernel/trace/blktrace.c:694
blkdev_ioctl+0x106/0x1880 block/ioctl.c:580
block_ioctl+0xde/0x120 fs/block_dev.c:1881
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7b9/0x1070 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
Freed by task 7018:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3496 [inline]
kmem_cache_free+0x83/0x2b0 mm/slab.c:3758
__d_free+0x20/0x30 fs/dcache.c:270
__rcu_reclaim kernel/rcu/rcu.h:195 [inline]
rcu_do_batch kernel/rcu/tree.c:2699 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2929 [inline]
rcu_process_callbacks+0x7c0/0x12c0 kernel/rcu/tree.c:2946
__do_softirq+0x24e/0x9ae kernel/softirq.c:288
The buggy address belongs to the object at ffff88807492e9a0
which belongs to the cache dentry of size 288
The buggy address is located 64 bytes inside of
288-byte region [ffff88807492e9a0, ffff88807492eac0)
The buggy address belongs to the page:
page:ffffea0001d24b80 count:1 mapcount:0 mapping:ffff88807492e000 index:0x0
flags: 0x1fffc0000000100(slab)
raw: 01fffc0000000100 ffff88807492e000 0000000000000000 000000010000000b
raw: ffffea0002916c60 ffffea0002682920 ffff88821f8b5680 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88807492e880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88807492e900: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
> ffff88807492e980: fc fc fc fc fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807492ea00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807492ea80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
kobject: 'loop2' (ffff8880a49245e0): kobject_uevent_env
==================================================================
kobject: 'loop2' (ffff8880a49245e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
---
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 syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
Jul 22, 2019, 4:49:06 AM7/22/19
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following crash on:
HEAD commit: ff33472c Linux 4.14.134
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=165a5cf0600000
kernel config: https://syzkaller.appspot.com/x/.config?x=3559c2b3fb5dd4b2
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1425c958600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b995ce...@syzkaller.appspotmail.com
audit: type=1400 audit(1563785144.910:36): avc: denied { map } for
pid=7219 comm="syz-executor652" path="/root/syz-executor652679038"
dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
==================================================================
BUG: KASAN: use-after-free in debugfs_remove /fs/debugfs/inode.c:662
Read of size 8 at addr ffff88809475e640 by task kworker/1:2/2505
CPU: 1 PID: 2505 Comm: kworker/1:2 Not tainted 4.14.134 #29
Call Trace:
__dump_stack /lib/dump_stack.c:17 [inline]
dump_stack+0x138/0x19c /lib/dump_stack.c:53
print_address_description.cold+0x7c/0x1dc /mm/kasan/report.c:252
kasan_report_error /mm/kasan/report.c:351 [inline]
kasan_report /mm/kasan/report.c:409 [inline]
kasan_report.cold+0xa9/0x2af /mm/kasan/report.c:393
__asan_report_load8_noabort+0x14/0x20 /mm/kasan/report.c:430
debugfs_remove /fs/debugfs/inode.c:662 [inline]
debugfs_remove+0xfb/0x120 /fs/debugfs/inode.c:654
blk_trace_free+0x38/0x140 /kernel/trace/blktrace.c:324
blk_trace_cleanup /kernel/trace/blktrace.c:351 [inline]
blk_trace_remove+0x59/0x80 /kernel/trace/blktrace.c:364
blk_trace_shutdown+0x4f/0x60 /kernel/trace/blktrace.c:728
__blk_release_queue+0x1f3/0x480 /block/blk-sysfs.c:827
process_one_work+0x863/0x1600 /kernel/workqueue.c:2114
worker_thread+0x5d9/0x1050 /kernel/workqueue.c:2248
kthread+0x319/0x430 /kernel/kthread.c:232
ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:404
Allocated by task 7239:
save_stack_trace+0x16/0x20 /arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 /mm/kasan/kasan.c:447
set_track /mm/kasan/kasan.c:459 [inline]
kasan_kmalloc /mm/kasan/kasan.c:551 [inline]
kasan_kmalloc+0xce/0xf0 /mm/kasan/kasan.c:529
kasan_slab_alloc+0xf/0x20 /mm/kasan/kasan.c:489
kmem_cache_alloc+0x12e/0x780 /mm/slab.c:3552
__d_alloc+0x2d/0x9f0 /fs/dcache.c:1623
d_alloc+0x4d/0x270 /fs/dcache.c:1710
__lookup_hash /fs/namei.c:1570 [inline]
__lookup_hash+0x58/0x180 /fs/namei.c:1562
lookup_one_len+0x27b/0x3a0 /fs/namei.c:2538
start_creating /fs/debugfs/inode.c:314 [inline]
start_creating+0xa6/0x1b0 /fs/debugfs/inode.c:290
__debugfs_create_file+0x53/0x3d0 /fs/debugfs/inode.c:353
debugfs_create_file+0x5a/0x70 /fs/debugfs/inode.c:404
do_blk_trace_setup+0x32d/0xb10 /kernel/trace/blktrace.c:529
blk_trace_setup+0xbd/0x140 /kernel/trace/blktrace.c:579
kobject: 'queue' (ffff8880a0b8c298): kobject_add_internal: parent: 'loop0',
set: '<NULL>'
blk_trace_ioctl+0x147/0x270 /kernel/trace/blktrace.c:694
blkdev_ioctl+0x100/0x1860 /block/ioctl.c:580
block_ioctl+0xde/0x120 /fs/block_dev.c:1881
vfs_ioctl /fs/ioctl.c:46 [inline]
file_ioctl /fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7ae/0x1060 /fs/ioctl.c:684
SYSC_ioctl /fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 /fs/ioctl.c:692
kobject: 'mq' (ffff8880a0b8c2d8): kobject_add_internal: parent: 'loop0',
set: '<NULL>'
do_syscall_64+0x1e8/0x640 /arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
kobject: 'mq' (ffff8880a0b8c2d8): kobject_uevent_env
Freed by task 17:
save_stack_trace+0x16/0x20 /arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 /mm/kasan/kasan.c:447
set_track /mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x75/0xc0 /mm/kasan/kasan.c:524
kobject: 'mq' (ffff8880a0b8c2d8): kobject_uevent_env: filter function
caused the event to drop!
__cache_free /mm/slab.c:3496 [inline]
kmem_cache_free+0x83/0x2b0 /mm/slab.c:3758
__d_free+0x20/0x30 /fs/dcache.c:270
__rcu_reclaim /kernel/rcu/rcu.h:195 [inline]
rcu_do_batch /kernel/rcu/tree.c:2699 [inline]
invoke_rcu_callbacks /kernel/rcu/tree.c:2962 [inline]
__rcu_process_callbacks /kernel/rcu/tree.c:2929 [inline]
rcu_process_callbacks+0x7b8/0x12b0 /kernel/rcu/tree.c:2946
__do_softirq+0x244/0x9a0 /kernel/softirq.c:288
kobject: '0' (ffff8880994a98e8): kobject_add_internal: parent: 'mq',
set: '<NULL>'
The buggy address belongs to the object at ffff88809475e600
index:0xffff88809475ece0
kobject: 'cpu0' (ffffe8ffffc2d318): kobject_add_internal: parent: '0',
set: '<NULL>'
flags: 0x1fffc0000000100(slab)
raw: 01fffc0000000100 ffff88809475e080 ffff88809475ece0 0000000100000004
raw: ffffea000251d420 ffffea0002516a20 ffff88821f8b5680 0000000000000000
set: '<NULL>'
Memory state around the buggy address:
ffff88809475e500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88809475e580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
> ffff88809475e600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88809475e680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
kobject: 'queue' (ffff8880a0b8c298): kobject_uevent_env
ffff88809475e700: fb fb fb fb fc fc fc fc fc fc fc fc fb fb fb fb
==================================================================
HEAD commit: ff33472c Linux 4.14.134
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=165a5cf0600000
kernel config: https://syzkaller.appspot.com/x/.config?x=3559c2b3fb5dd4b2
dashboard link: https://syzkaller.appspot.com/bug?extid=b995cedcc70f92f10fc4
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=152aa064600000
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1425c958600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b995ce...@syzkaller.appspotmail.com
pid=7219 comm="syz-executor652" path="/root/syz-executor652679038"
dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
==================================================================
BUG: KASAN: use-after-free in debugfs_remove /fs/debugfs/inode.c:662
[inline]
BUG: KASAN: use-after-free in debugfs_remove+0xfb/0x120
/fs/debugfs/inode.c:654
BUG: KASAN: use-after-free in debugfs_remove+0xfb/0x120
Read of size 8 at addr ffff88809475e640 by task kworker/1:2/2505
CPU: 1 PID: 2505 Comm: kworker/1:2 Not tainted 4.14.134 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: events __blk_release_queue
Google 01/01/2011
Call Trace:
__dump_stack /lib/dump_stack.c:17 [inline]
dump_stack+0x138/0x19c /lib/dump_stack.c:53
print_address_description.cold+0x7c/0x1dc /mm/kasan/report.c:252
kasan_report_error /mm/kasan/report.c:351 [inline]
kasan_report /mm/kasan/report.c:409 [inline]
kasan_report.cold+0xa9/0x2af /mm/kasan/report.c:393
__asan_report_load8_noabort+0x14/0x20 /mm/kasan/report.c:430
debugfs_remove /fs/debugfs/inode.c:662 [inline]
debugfs_remove+0xfb/0x120 /fs/debugfs/inode.c:654
blk_trace_free+0x38/0x140 /kernel/trace/blktrace.c:324
blk_trace_cleanup /kernel/trace/blktrace.c:351 [inline]
blk_trace_remove+0x59/0x80 /kernel/trace/blktrace.c:364
blk_trace_shutdown+0x4f/0x60 /kernel/trace/blktrace.c:728
__blk_release_queue+0x1f3/0x480 /block/blk-sysfs.c:827
process_one_work+0x863/0x1600 /kernel/workqueue.c:2114
worker_thread+0x5d9/0x1050 /kernel/workqueue.c:2248
kthread+0x319/0x430 /kernel/kthread.c:232
ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:404
Allocated by task 7239:
save_stack_trace+0x16/0x20 /arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 /mm/kasan/kasan.c:447
set_track /mm/kasan/kasan.c:459 [inline]
kasan_kmalloc /mm/kasan/kasan.c:551 [inline]
kasan_kmalloc+0xce/0xf0 /mm/kasan/kasan.c:529
kasan_slab_alloc+0xf/0x20 /mm/kasan/kasan.c:489
kmem_cache_alloc+0x12e/0x780 /mm/slab.c:3552
__d_alloc+0x2d/0x9f0 /fs/dcache.c:1623
d_alloc+0x4d/0x270 /fs/dcache.c:1710
__lookup_hash /fs/namei.c:1570 [inline]
__lookup_hash+0x58/0x180 /fs/namei.c:1562
lookup_one_len+0x27b/0x3a0 /fs/namei.c:2538
start_creating /fs/debugfs/inode.c:314 [inline]
start_creating+0xa6/0x1b0 /fs/debugfs/inode.c:290
__debugfs_create_file+0x53/0x3d0 /fs/debugfs/inode.c:353
debugfs_create_file+0x5a/0x70 /fs/debugfs/inode.c:404
do_blk_trace_setup+0x32d/0xb10 /kernel/trace/blktrace.c:529
blk_trace_setup+0xbd/0x140 /kernel/trace/blktrace.c:579
kobject: 'queue' (ffff8880a0b8c298): kobject_add_internal: parent: 'loop0',
set: '<NULL>'
blk_trace_ioctl+0x147/0x270 /kernel/trace/blktrace.c:694
blkdev_ioctl+0x100/0x1860 /block/ioctl.c:580
block_ioctl+0xde/0x120 /fs/block_dev.c:1881
vfs_ioctl /fs/ioctl.c:46 [inline]
file_ioctl /fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7ae/0x1060 /fs/ioctl.c:684
SYSC_ioctl /fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 /fs/ioctl.c:692
kobject: 'mq' (ffff8880a0b8c2d8): kobject_add_internal: parent: 'loop0',
set: '<NULL>'
do_syscall_64+0x1e8/0x640 /arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
kobject: 'mq' (ffff8880a0b8c2d8): kobject_uevent_env
Freed by task 17:
save_stack_trace+0x16/0x20 /arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 /mm/kasan/kasan.c:447
set_track /mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x75/0xc0 /mm/kasan/kasan.c:524
kobject: 'mq' (ffff8880a0b8c2d8): kobject_uevent_env: filter function
caused the event to drop!
__cache_free /mm/slab.c:3496 [inline]
kmem_cache_free+0x83/0x2b0 /mm/slab.c:3758
__d_free+0x20/0x30 /fs/dcache.c:270
__rcu_reclaim /kernel/rcu/rcu.h:195 [inline]
rcu_do_batch /kernel/rcu/tree.c:2699 [inline]
invoke_rcu_callbacks /kernel/rcu/tree.c:2962 [inline]
__rcu_process_callbacks /kernel/rcu/tree.c:2929 [inline]
rcu_process_callbacks+0x7b8/0x12b0 /kernel/rcu/tree.c:2946
__do_softirq+0x244/0x9a0 /kernel/softirq.c:288
kobject: '0' (ffff8880994a98e8): kobject_add_internal: parent: 'mq',
set: '<NULL>'
The buggy address belongs to the object at ffff88809475e600
which belongs to the cache dentry of size 288
The buggy address is located 64 bytes inside of
288-byte region [ffff88809475e600, ffff88809475e720)
The buggy address is located 64 bytes inside of
The buggy address belongs to the page:
page:ffffea000251d780 count:1 mapcount:0 mapping:ffff88809475e080
index:0xffff88809475ece0
kobject: 'cpu0' (ffffe8ffffc2d318): kobject_add_internal: parent: '0',
set: '<NULL>'
flags: 0x1fffc0000000100(slab)
raw: 01fffc0000000100 ffff88809475e080 ffff88809475ece0 0000000100000004
raw: ffffea000251d420 ffffea0002516a20 ffff88821f8b5680 0000000000000000
page dumped because: kasan: bad access detected
kobject: 'cpu1' (ffffe8ffffd2d318): kobject_add_internal: parent: '0',
set: '<NULL>'
Memory state around the buggy address:
ffff88809475e580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
> ffff88809475e600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88809475e680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
kobject: 'queue' (ffff8880a0b8c298): kobject_uevent_env
ffff88809475e700: fb fb fb fb fc fc fc fc fc fc fc fc fb fb fb fb
==================================================================
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