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: Wed, 18 Jan 2023 07:27:18 -0800 [thread overview]
Message-ID: <000000000000a9632e05f28b7373@google.com> (raw)
In-Reply-To: <20230118150448.3071-1-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_req_caches_free
==================================================================
BUG: KASAN: use-after-free in wq_stack_extract io_uring/slist.h:126 [inline]
BUG: KASAN: use-after-free in io_alloc_req io_uring/io_uring.h:356 [inline]
BUG: KASAN: use-after-free in io_req_caches_free+0x1a8/0x201 io_uring/io_uring.c:2745
Read of size 8 at addr ffff8880711c7938 by task kworker/u4:5/1184
CPU: 1 PID: 1184 Comm: kworker/u4:5 Not tainted 6.2.0-rc3-next-20230112-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Workqueue: events_unbound io_ring_exit_work
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
wq_stack_extract io_uring/slist.h:126 [inline]
io_alloc_req io_uring/io_uring.h:356 [inline]
io_req_caches_free+0x1a8/0x201 io_uring/io_uring.c:2745
io_ring_exit_work+0x2e7/0xc80 io_uring/io_uring.c:2977
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
</TASK>
Allocated by task 5597:
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:1063
io_alloc_req_refill io_uring/io_uring.h:348 [inline]
io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2415
__do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3439
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 1184:
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+0x1c4/0x201 io_uring/io_uring.c:2747
io_ring_exit_work+0x2e7/0xc80 io_uring/io_uring.c:2977
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 ffff8880711c78c0
which belongs to the cache io_kiocb of size 224
The buggy address is located 120 bytes inside of
224-byte region [ffff8880711c78c0, ffff8880711c79a0)
The buggy address belongs to the physical page:
page:ffffea0001c471c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x711c7
memcg:ffff88802b0a9f01
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffff88801c3f03c0 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800c000c 00000001ffffffff ffff88802b0a9f01
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 5597, tgid 5596 (syz-executor.0), ts 92319099413, free_ts 80415300921
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:1063
io_alloc_req_refill io_uring/io_uring.h:348 [inline]
io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2415
__do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3439
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
__folio_put_small mm/swap.c:106 [inline]
__folio_put+0xc5/0x140 mm/swap.c:129
folio_put include/linux/mm.h:1203 [inline]
put_page include/linux/mm.h:1272 [inline]
anon_pipe_buf_release+0x3fb/0x4c0 fs/pipe.c:138
pipe_buf_release include/linux/pipe_fs_i.h:183 [inline]
pipe_read+0x614/0x1110 fs/pipe.c:324
call_read_iter include/linux/fs.h:1846 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x7fa/0x930 fs/read_write.c:470
ksys_read+0x1ec/0x250 fs/read_write.c:613
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
Memory state around the buggy address:
ffff8880711c7800: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
ffff8880711c7880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
>ffff8880711c7900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880711c7980: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880711c7a00: 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=11b06c96480000
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=1056f519480000
next parent reply other threads:[~2023-01-18 15:28 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20230118150448.3071-1-hdanton@sina.com>
2023-01-18 15:27 ` 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] <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] <20230115074631.1541-1-hdanton@sina.com>
2023-01-15 8:06 ` 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=000000000000a9632e05f28b7373@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.