[syzbot] KASAN: use-after-free Read in vlan_dev_real_dev (2)

From: syzbot
Date: Mon Oct 11 2021 - 13:38:32 EST

Next message: Luis Chamberlain: "Re: [PATCH v8 03/12] selftests: add tests_sysfs module"
Previous message: Naveen Naidu: "[PATCH 01/22] PCI: Add PCI_ERROR_RESPONSE and it's related defintions"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Hello,

syzbot found the following issue on:

HEAD commit: 732b74d64704 virtio-net: fix for skb_over_panic inside big..
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=1751d798b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=e2ffb281e6323643
dashboard link: https://syzkaller.appspot.com/bug?extid=e4df4e1389e28972e955
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=103828fb300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14613277300000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e4df4e1389e28972e955@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: use-after-free in is_vlan_dev include/linux/if_vlan.h:74 [inline]
BUG: KASAN: use-after-free in vlan_dev_real_dev+0xf9/0x120 net/8021q/vlan_core.c:106
Read of size 4 at addr ffff8880781120c4 by task kworker/u4:1/10

CPU: 1 PID: 10 Comm: kworker/u4:1 Not tainted 5.15.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: gid-cache-wq netdevice_event_work_handler
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256
__kasan_report mm/kasan/report.c:442 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
is_vlan_dev include/linux/if_vlan.h:74 [inline]
vlan_dev_real_dev+0xf9/0x120 net/8021q/vlan_core.c:106
rdma_vlan_dev_real_dev include/rdma/ib_addr.h:267 [inline]
is_eth_port_of_netdev_filter.part.0+0xb1/0x2c0 drivers/infiniband/core/roce_gid_mgmt.c:157
is_eth_port_of_netdev_filter+0x28/0x40 drivers/infiniband/core/roce_gid_mgmt.c:153
ib_enum_roce_netdev+0x177/0x2f0 drivers/infiniband/core/device.c:2302
ib_enum_all_roce_netdevs+0xbd/0x130 drivers/infiniband/core/device.c:2331
netdevice_event_work_handler+0x9c/0x230 drivers/infiniband/core/roce_gid_mgmt.c:627
process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297
worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Allocated by task 6877:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
____kasan_kmalloc mm/kasan/common.c:472 [inline]
__kasan_kmalloc+0xa4/0xd0 mm/kasan/common.c:522
kmalloc_node include/linux/slab.h:614 [inline]
kvmalloc_node+0x61/0x120 mm/util.c:587
kvmalloc include/linux/mm.h:805 [inline]
kvzalloc include/linux/mm.h:813 [inline]
alloc_netdev_mqs+0x98/0xe80 net/core/dev.c:10794
rtnl_create_link+0x95a/0xb80 net/core/rtnetlink.c:3183
__rtnl_newlink+0xf73/0x1750 net/core/rtnetlink.c:3448
rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3506
rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2510
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1935
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
___sys_sendmsg+0xf3/0x170 net/socket.c:2463
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2492
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

Freed by task 6874:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free mm/kasan/common.c:328 [inline]
__kasan_slab_free+0xff/0x130 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1700 [inline]
slab_free_freelist_hook+0x81/0x190 mm/slub.c:1725
slab_free mm/slub.c:3483 [inline]
kfree+0xe4/0x530 mm/slub.c:4543
kvfree+0x42/0x50 mm/util.c:620
device_release+0x9f/0x240 drivers/base/core.c:2231
kobject_cleanup lib/kobject.c:705 [inline]
kobject_release lib/kobject.c:736 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1c8/0x540 lib/kobject.c:753
put_device+0x1b/0x30 drivers/base/core.c:3502
free_netdev+0x3e0/0x5b0 net/core/dev.c:10934
ppp_destroy_interface+0x2ab/0x340 drivers/net/ppp/ppp_generic.c:3397
ppp_release+0x1bf/0x240 drivers/net/ppp/ppp_generic.c:410
__fput+0x288/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff888078112000
which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 196 bytes inside of
4096-byte region [ffff888078112000, ffff888078113000)
The buggy address belongs to the page:
page:ffffea0001e04400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78110
head:ffffea0001e04400 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888010c4c280
raw: 0000000000000000 0000000000040004 00000001ffffffff 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_NOMEMALLOC), pid 6880, ts 73160788272, free_ts 73155121785
prep_new_page mm/page_alloc.c:2424 [inline]
get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4153
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5375
alloc_pages+0x1a7/0x300 mm/mempolicy.c:2197
alloc_slab_page mm/slub.c:1763 [inline]
allocate_slab mm/slub.c:1900 [inline]
new_slab+0x319/0x490 mm/slub.c:1963
___slab_alloc+0x921/0xfe0 mm/slub.c:2994
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3081
slab_alloc_node mm/slub.c:3172 [inline]
__kmalloc_node+0x2d2/0x370 mm/slub.c:4435
kmalloc_node include/linux/slab.h:614 [inline]
kvmalloc_node+0x61/0x120 mm/util.c:587
kvmalloc include/linux/mm.h:805 [inline]
seq_buf_alloc fs/seq_file.c:38 [inline]
seq_read_iter+0x7e7/0x1240 fs/seq_file.c:210
kernfs_fop_read_iter+0x44f/0x5f0 fs/kernfs/file.c:241
call_read_iter include/linux/fs.h:2157 [inline]
new_sync_read+0x421/0x6e0 fs/read_write.c:404
vfs_read+0x35c/0x600 fs/read_write.c:485
ksys_read+0x12d/0x250 fs/read_write.c:623
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:1338 [inline]
free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1389
free_unref_page_prepare mm/page_alloc.c:3315 [inline]
free_unref_page+0x19/0x690 mm/page_alloc.c:3394
__unfreeze_partials+0x340/0x360 mm/slub.c:2495
qlink_free mm/kasan/quarantine.c:146 [inline]
qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
__kasan_slab_alloc+0x95/0xb0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook mm/slab.h:519 [inline]
slab_alloc_node mm/slub.c:3206 [inline]
slab_alloc mm/slub.c:3214 [inline]
kmem_cache_alloc+0x142/0x390 mm/slub.c:3219
anon_vma_alloc mm/rmap.c:90 [inline]
anon_vma_fork+0xed/0x630 mm/rmap.c:355
dup_mmap kernel/fork.c:569 [inline]
dup_mm+0xa07/0x13e0 kernel/fork.c:1453
copy_mm kernel/fork.c:1505 [inline]
copy_process+0x6fcf/0x7580 kernel/fork.c:2194
kernel_clone+0xe7/0xac0 kernel/fork.c:2584
__do_sys_clone+0xc8/0x110 kernel/fork.c:2701
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

Memory state around the buggy address:
ffff888078111f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888078112000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888078112080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888078112100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888078112180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

---
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@xxxxxxxxxxxxxxxx.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

Next message: Luis Chamberlain: "Re: [PATCH v8 03/12] selftests: add tests_sysfs module"
Previous message: Naveen Naidu: "[PATCH 01/22] PCI: Add PCI_ERROR_RESPONSE and it's related defintions"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]