From: syzbot <syzbot+4c597a574a3f5a251bda@syzkaller.appspotmail.com>
To: Kernel-team@fb.com, asml.silence@gmail.com, axboe@kernel.dk,
dylany@fb.com, io-uring@vger.kernel.org,
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Write in io_sendrecv_fail
Date: Fri, 23 Sep 2022 09:41:37 -0700 [thread overview]
Message-ID: <000000000000020c4805e95ada45@google.com> (raw)
In-Reply-To: <0000000000005ec0e805e9575c11@google.com>
syzbot has found a reproducer for the following issue on:
HEAD commit: aaa11ce2ffc8 Add linux-next specific files for 20220923
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=158bdb90880000
kernel config: https://syzkaller.appspot.com/x/.config?x=186d1ff305f10294
dashboard link: https://syzkaller.appspot.com/bug?extid=4c597a574a3f5a251bda
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14d95fd8880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17d0c2ef080000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4c597a574a3f5a251bda@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in io_sendrecv_fail+0x3b0/0x3e0 io_uring/net.c:1221
Write of size 8 at addr ffff888021163080 by task syz-executor258/3615
CPU: 1 PID: 3615 Comm: syz-executor258 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x15e/0x45d mm/kasan/report.c:395
kasan_report+0xbb/0x1f0 mm/kasan/report.c:495
io_sendrecv_fail+0x3b0/0x3e0 io_uring/net.c:1221
io_req_complete_failed+0x155/0x1b0 io_uring/io_uring.c:873
io_drain_req io_uring/io_uring.c:1648 [inline]
io_queue_sqe_fallback.cold+0x29f/0x788 io_uring/io_uring.c:1931
io_submit_sqe io_uring/io_uring.c:2160 [inline]
io_submit_sqes+0x1180/0x1df0 io_uring/io_uring.c:2276
__do_sys_io_uring_enter+0xac6/0x2410 io_uring/io_uring.c:3216
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8db2983dc9
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffe363f568 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f8db2983dc9
RDX: 0000000000000000 RSI: 0000000000002a6e RDI: 0000000000000003
RBP: 00007f8db2947f70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8db2948000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Allocated by task 3615:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
kasan_set_track+0x21/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:371 [inline]
____kasan_kmalloc mm/kasan/common.c:330 [inline]
__kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slab_common.c:934 [inline]
__kmalloc+0x54/0xc0 mm/slab_common.c:947
kmalloc include/linux/slab.h:564 [inline]
io_alloc_async_data+0x9b/0x160 io_uring/io_uring.c:1590
io_msg_alloc_async io_uring/net.c:138 [inline]
io_msg_alloc_async_prep io_uring/net.c:147 [inline]
io_sendmsg_prep_async+0x19b/0x3c0 io_uring/net.c:221
io_req_prep_async+0x1d9/0x300 io_uring/io_uring.c:1613
io_drain_req io_uring/io_uring.c:1645 [inline]
io_queue_sqe_fallback.cold+0x281/0x788 io_uring/io_uring.c:1931
io_submit_sqe io_uring/io_uring.c:2160 [inline]
io_submit_sqes+0x1180/0x1df0 io_uring/io_uring.c:2276
__do_sys_io_uring_enter+0xac6/0x2410 io_uring/io_uring.c:3216
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed by task 3615:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
kasan_set_track+0x21/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511
____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:177 [inline]
slab_free_hook mm/slub.c:1669 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695
slab_free mm/slub.c:3599 [inline]
__kmem_cache_free+0xab/0x3b0 mm/slub.c:3612
io_sendrecv_fail+0x2a4/0x3e0 io_uring/net.c:1220
io_req_complete_failed+0x155/0x1b0 io_uring/io_uring.c:873
io_drain_req io_uring/io_uring.c:1648 [inline]
io_queue_sqe_fallback.cold+0x29f/0x788 io_uring/io_uring.c:1931
io_submit_sqe io_uring/io_uring.c:2160 [inline]
io_submit_sqes+0x1180/0x1df0 io_uring/io_uring.c:2276
__do_sys_io_uring_enter+0xac6/0x2410 io_uring/io_uring.c:3216
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The buggy address belongs to the object at ffff888021163000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 128 bytes inside of
512-byte region [ffff888021163000, ffff888021163200)
The buggy address belongs to the physical page:
page:ffffea0000845800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffffea0000854700 pfn:0x21160
head:ffffea0000845800 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff888011841c80 dead000080100010 0000000000000000
raw: ffffea0000854700 dead000000000002 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1501, tgid 1501 (kworker/u4:5), ts 8710207687, free_ts 0
prep_new_page mm/page_alloc.c:2538 [inline]
get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4287
__alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546
alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280
alloc_slab_page mm/slub.c:1739 [inline]
allocate_slab+0x213/0x300 mm/slub.c:1884
new_slab mm/slub.c:1937 [inline]
___slab_alloc+0xac1/0x1430 mm/slub.c:3119
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217
slab_alloc_node mm/slub.c:3302 [inline]
__kmem_cache_alloc_node+0x18a/0x3d0 mm/slub.c:3375
kmalloc_trace+0x22/0x60 mm/slab_common.c:1014
kmalloc include/linux/slab.h:559 [inline]
kzalloc include/linux/slab.h:695 [inline]
alloc_bprm+0x51/0x900 fs/exec.c:1510
kernel_execve+0xab/0x500 fs/exec.c:1969
call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:113
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
page_owner free stack trace missing
Memory state around the buggy address:
ffff888021162f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888021163000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888021163080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888021163100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888021163180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
prev parent reply other threads:[~2022-09-23 16:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-23 12:31 [syzbot] KASAN: use-after-free Write in io_sendrecv_fail syzbot
2022-09-23 16:41 ` syzbot [this message]
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=000000000000020c4805e95ada45@google.com \
--to=syzbot+4c597a574a3f5a251bda@syzkaller.appspotmail.com \
--cc=Kernel-team@fb.com \
--cc=asml.silence@gmail.com \
--cc=axboe@kernel.dk \
--cc=dylany@fb.com \
--cc=io-uring@vger.kernel.org \
--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.