在 2024/11/27 13:57, Bernard Metzler 写道:
-----Original Message-----
From: syzbot <syzbot+67a887427af54ecb7c93@xxxxxxxxxxxxxxxxxxxxxxxxx>
Sent: Wednesday, November 27, 2024 10:49 AM
To: Bernard Metzler <BMT@xxxxxxxxxxxxxx>; jgg@xxxxxxxx; leon@xxxxxxxxxx;
linux-kernel@xxxxxxxxxxxxxxx; linux-rdma@xxxxxxxxxxxxxxx;
netdev@xxxxxxxxxxxxxxx; syzkaller-bugs@xxxxxxxxxxxxxxxx
Subject: [EXTERNAL] [syzbot] [rdma?] KASAN: slab-use-after-free Read in
siw_query_port (2)
Hello,
syzbot found the following issue on:
HEAD commit: 5d066766c5f1 net/l2tp: fix warning in l2tp_exit_net found
..
git tree: net
console output: https%
3A__syzkaller.appspot.com_x_log.txt-3Fx-
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kernel config: https%
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3D83e9a7f9e94ea674&d=DwIBaQ&c=BSDicqBQBDjDI9RkVyTcHQ&r=4ynb4Sj_4MUcZXbhvovE
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compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for
Debian) 2.40
syz repro: https%
3A__syzkaller.appspot.com_x_repro.syz-3Fx-
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IMPORTANT: if you fix the issue, please add the following tag to the
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Reported-by: syzbot+67a887427af54ecb7c93@xxxxxxxxxxxxxxxxxxxxxxxxx
xfrm0 speed is unknown, defaulting to 1000
==================================================================
BUG: KASAN: slab-use-after-free in siw_query_port+0x348/0x440
drivers/infiniband/sw/siw/siw_verbs.c:183
Read of size 4 at addr ffff88802ff88038 by task kworker/0:5/5883
CPU: 0 UID: 0 PID: 5883 Comm: kworker/0:5 Not tainted 6.12.0-syzkaller-
05491-g5d066766c5f1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 09/13/2024
Workqueue: infiniband ib_cache_event_task
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
siw_query_port+0x348/0x440 drivers/infiniband/sw/siw/siw_verbs.c:183
ib_cache_update+0x1a9/0xb80 drivers/infiniband/core/cache.c:1494
ib_cache_event_task+0xf3/0x1e0 drivers/infiniband/core/cache.c:1568
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Here siw is getting a use-after-free when accessing the netdev in
query_port() verb, since the netdev got free'd already. I was
assuming the rdma core would serialize device deallocation
and driver access accordingly. Seems not to be the case?
Looking at somewhat similar rxe driver, I see a mutex protecting
netdev access in rxe_query_port() - 'rxe->usdev_lock'. That
mutex is used only right there and I don't see how it is useful.
@Zhu, was it intended to serialize netdev access?
I will delve into this problem and reply you later.
Zhu Yanjun
Many thanks,
Bernard.
Allocated by task 10564:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:257 [inline]
__do_kmalloc_node mm/slub.c:4264 [inline]
__kmalloc_node_noprof+0x22a/0x440 mm/slub.c:4270
__kvmalloc_node_noprof+0x72/0x190 mm/util.c:658
alloc_netdev_mqs+0xa4/0x1080 net/core/dev.c:11203
rtnl_create_link+0x2f9/0xc20 net/core/rtnetlink.c:3595
rtnl_newlink_create+0x210/0xa30 net/core/rtnetlink.c:3770
__rtnl_newlink net/core/rtnetlink.c:3897 [inline]
rtnl_newlink+0x17dd/0x24f0 net/core/rtnetlink.c:4007
rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6917
netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2542
netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]
netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1347
netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1891
sock_sendmsg_nosec net/socket.c:711 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:726
__sys_sendto+0x363/0x4c0 net/socket.c:2197
__do_sys_sendto net/socket.c:2204 [inline]
__se_sys_sendto net/socket.c:2200 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2200
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 35:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:2342 [inline]
slab_free mm/slub.c:4579 [inline]
kfree+0x1a0/0x440 mm/slub.c:4727
device_release+0x99/0x1c0
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x22f/0x480 lib/kobject.c:737
netdev_run_todo+0xe79/0x1000 net/core/dev.c:10918
cleanup_net+0x762/0xcc0 net/core/net_namespace.c:628
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
The buggy address belongs to the object at ffff88802ff88000
which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 56 bytes inside of
freed 4096-byte region [ffff88802ff88000, ffff88802ff89000)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ff88
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888031975541
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b04f500 ffffea0001f8f800 dead000000000002
raw: 0000000000000000 0000000000040004 00000001f5000000 ffff888031975541
head: 00fff00000000040 ffff88801b04f500 ffffea0001f8f800 dead000000000002
head: 0000000000000000 0000000000040004 00000001f5000000 ffff888031975541
head: 00fff00000000003 ffffea0000bfe201 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 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_NOMEM
ALLOC), pid 7294, tgid 7294 (udevd), ts 104300491113, free_ts 104288279948
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556
prep_new_page mm/page_alloc.c:1564 [inline]
get_page_from_freelist+0x3649/0x3790 mm/page_alloc.c:3474
__alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4751
alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
alloc_slab_page+0x6a/0x140 mm/slub.c:2412
allocate_slab+0x5a/0x2f0 mm/slub.c:2578
new_slab mm/slub.c:2631 [inline]
___slab_alloc+0xcd1/0x14b0 mm/slub.c:3818
__slab_alloc+0x58/0xa0 mm/slub.c:3908
__slab_alloc_node mm/slub.c:3961 [inline]
slab_alloc_node mm/slub.c:4122 [inline]
__do_kmalloc_node mm/slub.c:4263 [inline]
__kmalloc_node_noprof+0x286/0x440 mm/slub.c:4270
__kvmalloc_node_noprof+0x72/0x190 mm/util.c:658
seq_buf_alloc fs/seq_file.c:38 [inline]
seq_read_iter+0x20c/0xd70 fs/seq_file.c:210
new_sync_read fs/read_write.c:484 [inline]
vfs_read+0x991/0xb70 fs/read_write.c:565
ksys_read+0x18f/0x2b0 fs/read_write.c:708
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7342 tgid 7342 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1127 [inline]
free_unref_page+0xdf9/0x1140 mm/page_alloc.c:2657
discard_slab mm/slub.c:2677 [inline]
__put_partials+0xeb/0x130 mm/slub.c:3145
put_cpu_partial+0x17c/0x250 mm/slub.c:3220
__slab_free+0x2ea/0x3d0 mm/slub.c:4449
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:247 [inline]
slab_post_alloc_hook mm/slub.c:4085 [inline]
slab_alloc_node mm/slub.c:4134 [inline]
kmem_cache_alloc_lru_noprof+0x139/0x2b0 mm/slub.c:4153
sock_alloc_inode+0x28/0xc0 net/socket.c:307
alloc_inode+0x65/0x1a0 fs/inode.c:336
sock_alloc net/socket.c:615 [inline]
__sock_create+0x127/0xa30 net/socket.c:1522
sock_create net/socket.c:1616 [inline]
__sys_socket_create net/socket.c:1653 [inline]
__sys_socket+0x150/0x3c0 net/socket.c:1700
__do_sys_socket net/socket.c:1714 [inline]
__se_sys_socket net/socket.c:1712 [inline]
__x64_sys_socket+0x7a/0x90 net/socket.c:1712
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88802ff87f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88802ff87f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88802ff88000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802ff88080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802ff88100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
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