From: syzbot <syzbot+e29d28728f38190cecfc@syzkaller.appspotmail.com>
To: hdanton@sina.com, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Read in snd_pcm_post_stop
Date: Sun, 15 Jan 2023 00:06:16 -0800 [thread overview]
Message-ID: <000000000000e4620105f248f04d@google.com> (raw)
In-Reply-To: <20230115074631.1541-1-hdanton@sina.com>
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: use-after-free Read in io_fallback_tw
==================================================================
BUG: KASAN: use-after-free in io_fallback_tw+0x6d/0x119 io_uring/io_uring.c:1253
Read of size 8 at addr ffff888029b7c948 by task syz-executor.0/5601
CPU: 1 PID: 5601 Comm: syz-executor.0 Not tainted 6.2.0-rc3-next-20230112-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:306 [inline]
print_report+0x15e/0x45d mm/kasan/report.c:417
kasan_report+0xc0/0xf0 mm/kasan/report.c:517
io_fallback_tw+0x6d/0x119 io_uring/io_uring.c:1253
tctx_task_work.cold+0xf/0x2c io_uring/io_uring.c:1223
task_work_run+0x16f/0x270 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xb17/0x2a90 kernel/exit.c:867
do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
get_signal+0x225f/0x24f0 kernel/signal.c:2859
arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f9fa6c8c0c9
Code: Unable to access opcode bytes at 0x7f9fa6c8c09f.
RSP: 002b:00007f9fa7a98168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: fffffffffffffe00 RBX: 00007f9fa6dabf80 RCX: 00007f9fa6c8c0c9
RDX: 0000000000002020 RSI: 00000000200021c0 RDI: 0000000000000006
RBP: 00007f9fa6ce7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdca0565bf R14: 00007f9fa7a98300 R15: 0000000000022000
</TASK>
Allocated by task 5601:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
__kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:325
kasan_slab_alloc include/linux/kasan.h:186 [inline]
slab_post_alloc_hook mm/slab.h:769 [inline]
kmem_cache_alloc_bulk+0x3aa/0x730 mm/slub.c:4033
__io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1064
io_alloc_req_refill io_uring/io_uring.h:348 [inline]
io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2412
__do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3434
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+0x63/0xcd
Freed by task 33:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:162 [inline]
slab_free_hook mm/slub.c:1781 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
slab_free mm/slub.c:3787 [inline]
kmem_cache_free+0xec/0x4e0 mm/slub.c:3809
io_req_caches_free+0x1a9/0x1e6 io_uring/io_uring.c:2742
io_ring_exit_work+0x2e7/0xc80 io_uring/io_uring.c:2972
process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293
worker_thread+0x669/0x1090 kernel/workqueue.c:2440
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
The buggy address belongs to the object at ffff888029b7c8c0
which belongs to the cache io_kiocb of size 224
The buggy address is located 136 bytes inside of
224-byte region [ffff888029b7c8c0, ffff888029b7c9a0)
The buggy address belongs to the physical page:
page:ffffea0000a6df00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29b7c
memcg:ffff88801de69981
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffff888146395500 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800c000c 00000001ffffffff ffff88801de69981
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5601, tgid 5600 (syz-executor.0), ts 79202512513, free_ts 51400073995
prep_new_page mm/page_alloc.c:2549 [inline]
get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4324
__alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5590
alloc_pages+0x1aa/0x270 mm/mempolicy.c:2281
alloc_slab_page mm/slub.c:1851 [inline]
allocate_slab+0x25f/0x350 mm/slub.c:1998
new_slab mm/slub.c:2051 [inline]
___slab_alloc+0xa91/0x1400 mm/slub.c:3193
__kmem_cache_alloc_bulk mm/slub.c:3951 [inline]
kmem_cache_alloc_bulk+0x23d/0x730 mm/slub.c:4026
__io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1064
io_alloc_req_refill io_uring/io_uring.h:348 [inline]
io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2412
__do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3434
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+0x63/0xcd
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1451 [inline]
free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1501
free_unref_page_prepare mm/page_alloc.c:3387 [inline]
free_unref_page+0x1d/0x490 mm/page_alloc.c:3482
__vunmap+0x7fe/0xc00 mm/vmalloc.c:2746
__vfree+0x3c/0xd0 mm/vmalloc.c:2794
vfree+0x5e/0x90 mm/vmalloc.c:2825
kcov_put kernel/kcov.c:428 [inline]
kcov_put+0x26/0x40 kernel/kcov.c:424
kcov_close+0x10/0x20 kernel/kcov.c:524
__fput+0x27c/0xa90 fs/file_table.c:321
task_work_run+0x16f/0x270 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xb17/0x2a90 kernel/exit.c:867
do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
get_signal+0x225f/0x24f0 kernel/signal.c:2859
arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
Memory state around the buggy address:
ffff888029b7c800: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888029b7c880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
>ffff888029b7c900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888029b7c980: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
ffff888029b7ca00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
Tested on:
commit: 0a093b28 Add linux-next specific files for 20230112
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
console output: https://syzkaller.appspot.com/x/log.txt?x=14412b16480000
kernel config: https://syzkaller.appspot.com/x/.config?x=835f3591019836d5
dashboard link: https://syzkaller.appspot.com/bug?extid=e29d28728f38190cecfc
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
patch: https://syzkaller.appspot.com/x/patch.diff?x=15c09ea6480000
next parent reply other threads:[~2023-01-15 8:06 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20230115074631.1541-1-hdanton@sina.com>
2023-01-15 8:06 ` syzbot [this message]
[not found] <20230201233318.593-1-hdanton@sina.com>
2023-02-02 5:24 ` [syzbot] KASAN: use-after-free Read in snd_pcm_post_stop syzbot
[not found] <20230119081633.3470-1-hdanton@sina.com>
2023-02-01 16:41 ` syzbot
[not found] <20230119030102.3388-1-hdanton@sina.com>
2023-01-19 3:18 ` syzbot
[not found] <20230119012145.3304-1-hdanton@sina.com>
2023-01-19 2:01 ` syzbot
[not found] <20230118222858.3127-1-hdanton@sina.com>
2023-01-19 1:13 ` syzbot
[not found] <20230118150448.3071-1-hdanton@sina.com>
2023-01-18 15:27 ` syzbot
[not found] <20230118094915.2906-1-hdanton@sina.com>
2023-01-18 14:07 ` syzbot
[not found] <20230118055330.2780-1-hdanton@sina.com>
2023-01-18 7:06 ` syzbot
[not found] <20230118023942.2716-1-hdanton@sina.com>
2023-01-18 2:59 ` syzbot
[not found] <20230117093837.2433-1-hdanton@sina.com>
2023-01-17 17:54 ` syzbot
[not found] <20230117015907.2238-1-hdanton@sina.com>
2023-01-17 2:39 ` syzbot
[not found] <20230116053340.1952-1-hdanton@sina.com>
2023-01-16 12:44 ` syzbot
[not found] <20230116012417.1876-1-hdanton@sina.com>
2023-01-16 1:55 ` syzbot
[not found] <20230116000718.1809-1-hdanton@sina.com>
2023-01-16 0:34 ` syzbot
[not found] <20230115232650.1752-1-hdanton@sina.com>
2023-01-15 23:43 ` syzbot
[not found] <20230115220938.1677-1-hdanton@sina.com>
2023-01-15 22:31 ` syzbot
[not found] <20230115122106.1614-1-hdanton@sina.com>
2023-01-15 16:04 ` syzbot
[not found] <20230113113404.879-1-hdanton@sina.com>
2023-01-13 11:59 ` syzbot
2023-01-13 7:30 syzbot
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=000000000000e4620105f248f04d@google.com \
--to=syzbot+e29d28728f38190cecfc@syzkaller.appspotmail.com \
--cc=hdanton@sina.com \
--cc=linux-kernel@vger.kernel.org \
--cc=syzkaller-bugs@googlegroups.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.