From: syzbot <syzbot+9c3492b27d10dc49ffa6@syzkaller.appspotmail.com>
To: asml.silence@gmail.com, axboe@kernel.dk,
io-uring@vger.kernel.org, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: [syzbot] KASAN: use-after-free Read in tctx_task_work (2)
Date: Thu, 19 Aug 2021 01:10:18 -0700 [thread overview]
Message-ID: <000000000000e1a5d005c9e514ed@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: f26c3abc432a Add linux-next specific files for 20210818
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=169f1731300000
kernel config: https://syzkaller.appspot.com/x/.config?x=d472f8be79a62b44
dashboard link: https://syzkaller.appspot.com/bug?extid=9c3492b27d10dc49ffa6
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15f35e16300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=161c1765300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9c3492b27d10dc49ffa6@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in ctx_flush_and_put fs/io_uring.c:2031 [inline]
BUG: KASAN: use-after-free in tctx_task_work+0x307/0x310 fs/io_uring.c:2078
Read of size 4 at addr ffff88801da62358 by task syz-executor959/7251
CPU: 0 PID: 7251 Comm: syz-executor959 Not tainted 5.14.0-rc6-next-20210818-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+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256
__kasan_report mm/kasan/report.c:442 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
ctx_flush_and_put fs/io_uring.c:2031 [inline]
tctx_task_work+0x307/0x310 fs/io_uring.c:2078
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
exit_task_work include/linux/task_work.h:32 [inline]
do_exit+0xbae/0x2a30 kernel/exit.c:825
do_group_exit+0x129/0x310 kernel/exit.c:922
get_signal+0x482/0x2170 kernel/signal.c:2846
arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x446749
Code: Unable to access opcode bytes at RIP 0x44671f.
RSP: 002b:00007f2e177871e8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 000000000000039b RBX: 00000000004cb468 RCX: 0000000000446749
RDX: 0000000000000000 RSI: 0000000000006b46 RDI: 0000000000000006
RBP: 00000000004cb460 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004cb46c
R13: 00007ffe292df50f R14: 00007f2e17787300 R15: 0000000000022000
Allocated by task 7251:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
____kasan_kmalloc mm/kasan/common.c:472 [inline]
__kasan_kmalloc+0x9f/0xd0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:591 [inline]
kzalloc include/linux/slab.h:721 [inline]
io_ring_ctx_alloc fs/io_uring.c:1235 [inline]
io_uring_create fs/io_uring.c:9876 [inline]
io_uring_setup+0x27d/0x2d00 fs/io_uring.c:9982
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 6731:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free mm/kasan/common.c:328 [inline]
__kasan_slab_free+0xff/0x140 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1681 [inline]
slab_free_freelist_hook+0x82/0x190 mm/slub.c:1706
slab_free mm/slub.c:3463 [inline]
kfree+0xea/0x540 mm/slub.c:4523
io_ring_ctx_free fs/io_uring.c:8902 [inline]
io_ring_exit_work+0x13c7/0x1940 fs/io_uring.c:9051
process_one_work+0x9c9/0x16b0 kernel/workqueue.c:2297
worker_thread+0x65b/0x1200 kernel/workqueue.c:2444
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Last potentially related work creation:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348
insert_work+0x48/0x370 kernel/workqueue.c:1353
__queue_work+0x5d1/0xf30 kernel/workqueue.c:1519
queue_work_on+0xf6/0x110 kernel/workqueue.c:1546
queue_work include/linux/workqueue.h:502 [inline]
io_ring_ctx_wait_and_kill+0x314/0x3d0 fs/io_uring.c:9104
io_uring_release+0x3e/0x50 fs/io_uring.c:9112
__fput+0x288/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
exit_task_work include/linux/task_work.h:32 [inline]
do_exit+0xbae/0x2a30 kernel/exit.c:825
do_group_exit+0x129/0x310 kernel/exit.c:922
get_signal+0x482/0x2170 kernel/signal.c:2846
arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
The buggy address belongs to the object at ffff88801da62000
which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 856 bytes inside of
4096-byte region [ffff88801da62000, ffff88801da63000)
The buggy address belongs to the page:
page:ffffea0000769800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1da60
head:ffffea0000769800 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010c42140
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 254, ts 8722226076, free_ts 8721850730
prep_new_page mm/page_alloc.c:2424 [inline]
get_page_from_freelist+0xa76/0x2f90 mm/page_alloc.c:4151
__alloc_pages+0x1ba/0x510 mm/page_alloc.c:5373
alloc_pages+0x1a7/0x300 mm/mempolicy.c:2188
alloc_slab_page mm/slub.c:1744 [inline]
allocate_slab mm/slub.c:1881 [inline]
new_slab+0x321/0x490 mm/slub.c:1944
___slab_alloc+0x90b/0xfb0 mm/slub.c:2974
__slab_alloc.constprop.0+0x51/0xa0 mm/slub.c:3061
slab_alloc_node mm/slub.c:3152 [inline]
slab_alloc mm/slub.c:3194 [inline]
kmem_cache_alloc_trace+0x30a/0x3c0 mm/slub.c:3211
kmalloc include/linux/slab.h:591 [inline]
kzalloc include/linux/slab.h:721 [inline]
kobject_uevent_env+0x240/0x1650 lib/kobject_uevent.c:524
device_add+0xbc6/0x21b0 drivers/base/core.c:3340
scsi_target_add drivers/scsi/scsi_sysfs.c:1309 [inline]
scsi_sysfs_add_sdev+0x464/0x750 drivers/scsi/scsi_sysfs.c:1336
scsi_sysfs_add_devices drivers/scsi/scsi_scan.c:1727 [inline]
scsi_finish_async_scan drivers/scsi/scsi_scan.c:1812 [inline]
do_scan_async+0x211/0x500 drivers/scsi/scsi_scan.c:1855
async_run_entry_fn+0x9d/0x550 kernel/async.c:127
process_one_work+0x9c9/0x16b0 kernel/workqueue.c:2297
worker_thread+0x65b/0x1200 kernel/workqueue.c:2444
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1338 [inline]
free_pcp_prepare+0x377/0x860 mm/page_alloc.c:1389
free_unref_page_prepare mm/page_alloc.c:3315 [inline]
free_unref_page+0x19/0x690 mm/page_alloc.c:3394
sbitmap_free include/linux/sbitmap.h:165 [inline]
scsi_device_dev_release_usercontext+0x65a/0xd60 drivers/scsi/scsi_sysfs.c:479
execute_in_process_context+0x37/0x160 kernel/workqueue.c:3358
device_release+0xa3/0x240 drivers/base/core.c:2195
kobject_cleanup lib/kobject.c:705 [inline]
kobject_release lib/kobject.c:736 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1d0/0x540 lib/kobject.c:753
put_device+0x1b/0x30 drivers/base/core.c:3466
__scsi_remove_device+0x1e1/0x3e0 drivers/scsi/scsi_sysfs.c:1477
scsi_probe_and_add_lun+0x266d/0x35a0 drivers/scsi/scsi_scan.c:1205
__scsi_scan_target+0x229/0xdc0 drivers/scsi/scsi_scan.c:1588
scsi_scan_channel drivers/scsi/scsi_scan.c:1676 [inline]
scsi_scan_channel+0x148/0x1e0 drivers/scsi/scsi_scan.c:1652
scsi_scan_host_selected+0x2df/0x3b0 drivers/scsi/scsi_scan.c:1705
do_scsi_scan_host+0x1eb/0x260 drivers/scsi/scsi_scan.c:1844
do_scan_async+0x3e/0x500 drivers/scsi/scsi_scan.c:1854
async_run_entry_fn+0x9d/0x550 kernel/async.c:127
process_one_work+0x9c9/0x16b0 kernel/workqueue.c:2297
Memory state around the buggy address:
ffff88801da62200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801da62280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801da62300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801da62380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801da62400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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.
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syzbot can test patches for this issue, for details see:
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next reply other threads:[~2021-08-19 8:10 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-19 8:10 syzbot [this message]
2021-08-19 10:03 ` [syzbot] KASAN: use-after-free Read in tctx_task_work (2) Pavel Begunkov
2021-08-19 10:44 ` syzbot
2021-08-19 11:13 ` Pavel Begunkov
2021-08-19 17:25 ` syzbot
2021-08-19 20:56 ` Pavel Begunkov
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