lkml.org 
[lkml]   [2022]   [May]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
Subject[syzbot] KASAN: use-after-free Read in tipc_named_reinit (2)
From
Hello,

syzbot found the following issue on:

HEAD commit: 17d49e6e8012 Merge branch 'remove-NAPI_POLL_WEIGHT-copies'
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15a8a926f00000
kernel config: https://syzkaller.appspot.com/x/.config?x=4f67580b287bc88d
dashboard link: https://syzkaller.appspot.com/bug?extid=47af19f3307fc9c5c82e
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+47af19f3307fc9c5c82e@syzkaller.appspotmail.com

tipc: Node number set to 1
==================================================================
BUG: KASAN: use-after-free in tipc_named_reinit+0x94f/0x9b0 net/tipc/name_distr.c:413
Read of size 8 at addr ffff88805299a000 by task kworker/1:9/23764

CPU: 1 PID: 23764 Comm: kworker/1:9 Not tainted 5.18.0-rc4-syzkaller-00878-g17d49e6e8012 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events tipc_net_finalize_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313
print_report mm/kasan/report.c:429 [inline]
kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
tipc_named_reinit+0x94f/0x9b0 net/tipc/name_distr.c:413
tipc_net_finalize+0x234/0x3d0 net/tipc/net.c:138
process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
</TASK>

The buggy address belongs to the physical page:
page:ffffea00014a6680 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5299a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x140dc0(GFP_USER|__GFP_COMP|__GFP_ZERO), pid 32268, tgid 32268 (syz-executor.0), ts 2019363271552, free_ts 2022187878511
prep_new_page mm/page_alloc.c:2441 [inline]
get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4182
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408
alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272
kmalloc_order+0x34/0xf0 mm/slab_common.c:953
kmalloc_order_trace+0x14/0x120 mm/slab_common.c:969
kmalloc_large include/linux/slab.h:510 [inline]
kmalloc include/linux/slab.h:574 [inline]
kzalloc include/linux/slab.h:714 [inline]
tipc_nametbl_init+0x145/0x480 net/tipc/name_table.c:891
tipc_init_net+0x408/0x660 net/tipc/core.c:80
ops_init+0xaf/0x470 net/core/net_namespace.c:134
setup_net+0x5d1/0xc50 net/core/net_namespace.c:325
copy_net_ns+0x318/0x760 net/core/net_namespace.c:471
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x445/0x920 kernel/fork.c:3132
__do_sys_unshare kernel/fork.c:3203 [inline]
__se_sys_unshare kernel/fork.c:3201 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3201
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+0x44/0xae
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1356 [inline]
free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406
free_unref_page_prepare mm/page_alloc.c:3328 [inline]
free_unref_page+0x19/0x6a0 mm/page_alloc.c:3423
tipc_exit_net+0x132/0x560 net/tipc/core.c:117
ops_exit_list+0xb0/0x170 net/core/net_namespace.c:162
cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594
process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Memory state around the buggy address:
ffff888052999f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff888052999f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88805299a000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff88805299a080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88805299a100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================


---
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.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

\
 
 \ /
  Last update: 2022-05-03 08:22    [W:0.080 / U:0.696 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site