syzbot


KASAN: slab-use-after-free Read in team_device_event

Status: fixed on 2023/10/12 12:48
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+44ae022028805f4600fc@syzkaller.appspotmail.com
Fix commit: 6afcf0fb9270 Revert "net: team: do not use dynamic lockdep key"
First crash: 285d, last: 284d
Cause bisection: introduced by (bisect log) :
commit 39285e124edbc752331e98ace37cc141a6a3747a
Author: Taehee Yoo <ap420073@gmail.com>
Date: Tue Sep 5 08:46:10 2023 +0000

  net: team: do not use dynamic lockdep key

Crash: KASAN: slab-use-after-free Read in team_device_event (log)
Repro: C syz .config
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [net?] KASAN: slab-use-after-free Read in team_device_event 0 (1) 2023/09/07 15:22
Last patch testing requests (4)
Created Duration User Patch Repo Result
2023/09/10 03:17 22m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git f8fdd54ee6a1 OK log
2023/09/09 09:20 31m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git f8fdd54ee6a1 report log
2023/09/09 04:07 18m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git f8fdd54ee6a1 report log
2023/09/09 02:56 35m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git f8fdd54ee6a1 report log

Sample crash report:
8021q: adding VLAN 0 to HW filter on device bond1
==================================================================
BUG: KASAN: slab-out-of-bounds in team_device_event+0xa3b/0xad0 drivers/net/team/team.c:3021
Read of size 8 at addr ffff888143fdc1a8 by task syz-executor133/5151

CPU: 0 PID: 5151 Comm: syz-executor133 Not tainted 6.5.0-syzkaller-04043-gf8fdd54ee6a1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:475
 kasan_report+0xda/0x110 mm/kasan/report.c:588
 team_device_event+0xa3b/0xad0 drivers/net/team/team.c:3021
 notifier_call_chain+0xb6/0x3b0 kernel/notifier.c:93
 call_netdevice_notifiers_info+0xb9/0x130 net/core/dev.c:1970
 call_netdevice_notifiers_extack net/core/dev.c:2008 [inline]
 call_netdevice_notifiers net/core/dev.c:2022 [inline]
 netdev_features_change net/core/dev.c:1333 [inline]
 netdev_update_features net/core/dev.c:9874 [inline]
 netdev_update_features net/core/dev.c:9871 [inline]
 dev_disable_lro+0x224/0x3e0 net/core/dev.c:1606
 team_port_add drivers/net/team/team.c:1248 [inline]
 team_add_slave+0x1a4d/0x2310 drivers/net/team/team.c:1977
 do_set_master+0x1bc/0x220 net/core/rtnetlink.c:2674
 do_setlink+0xa07/0x3fa0 net/core/rtnetlink.c:2873
 __rtnl_newlink+0xc1d/0x1940 net/core/rtnetlink.c:3671
 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3718
 rtnetlink_rcv_msg+0x439/0xd30 net/core/rtnetlink.c:6444
 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2545
 netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]
 netlink_unicast+0x536/0x810 net/netlink/af_netlink.c:1368
 netlink_sendmsg+0x93c/0xe40 net/netlink/af_netlink.c:1910
 sock_sendmsg_nosec net/socket.c:728 [inline]
 sock_sendmsg+0xd9/0x180 net/socket.c:751
 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2539
 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2593
 __sys_sendmsg+0x117/0x1e0 net/socket.c:2622
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff3deaf85d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd3e202a18 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007ff3deaf85d9
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 5151:
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:196 [inline]
 __do_kmalloc_node mm/slab_common.c:985 [inline]
 __kmalloc_node_track_caller+0x5e/0x100 mm/slab_common.c:1005
 kstrdup+0x3c/0x70 mm/util.c:62
 kstrdup_const+0x5f/0x70 mm/util.c:85
 __kernfs_new_node+0x9c/0x8a0 fs/kernfs/dir.c:607
 kernfs_new_node+0x94/0x110 fs/kernfs/dir.c:675
 kernfs_create_link+0xcc/0x230 fs/kernfs/symlink.c:39
 sysfs_do_create_link_sd+0x90/0x140 fs/sysfs/symlink.c:44
 sysfs_do_create_link fs/sysfs/symlink.c:80 [inline]
 sysfs_create_link+0x61/0xc0 fs/sysfs/symlink.c:92
 netdev_adjacent_sysfs_add net/core/dev.c:7481 [inline]
 __netdev_adjacent_dev_insert+0x751/0xb40 net/core/dev.c:7537
 __netdev_adjacent_dev_link_lists net/core/dev.c:7619 [inline]
 __netdev_adjacent_dev_link_neighbour net/core/dev.c:7643 [inline]
 __netdev_upper_dev_link+0x410/0x840 net/core/dev.c:7703
 netdev_upper_dev_link+0x92/0xc0 net/core/dev.c:7749
 macsec_newlink+0x800/0x1a30 drivers/net/macsec.c:4087
 rtnl_newlink_create net/core/rtnetlink.c:3485 [inline]
 __rtnl_newlink+0x1177/0x1940 net/core/rtnetlink.c:3705
 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3718
 rtnetlink_rcv_msg+0x439/0xd30 net/core/rtnetlink.c:6444
 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2545
 netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]
 netlink_unicast+0x536/0x810 net/netlink/af_netlink.c:1368
 netlink_sendmsg+0x93c/0xe40 net/netlink/af_netlink.c:1910
 sock_sendmsg_nosec net/socket.c:728 [inline]
 sock_sendmsg+0xd9/0x180 net/socket.c:751
 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2539
 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2593
 __sys_sendmsg+0x117/0x1e0 net/socket.c:2622
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888143fdc1a0
 which belongs to the cache kmalloc-16 of size 16
The buggy address is located 8 bytes inside of
 allocated 12-byte region [ffff888143fdc1a0, ffff888143fdc1ac)

The buggy address belongs to the physical page:
page:ffffea00050ff700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x143fdc
flags: 0x57ff00000000200(slab|node=1|zone=2|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 057ff00000000200 ffff8880128413c0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080800080 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 10509138456, free_ts 0
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1570
 prep_new_page mm/page_alloc.c:1577 [inline]
 get_page_from_freelist+0x10a9/0x31e0 mm/page_alloc.c:3221
 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4477
 alloc_page_interleave+0x1e/0x250 mm/mempolicy.c:2131
 alloc_pages+0x22a/0x270 mm/mempolicy.c:2293
 alloc_slab_page mm/slub.c:1862 [inline]
 allocate_slab+0x24e/0x380 mm/slub.c:2009
 new_slab mm/slub.c:2062 [inline]
 ___slab_alloc+0x8bc/0x1570 mm/slub.c:3215
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3314
 __slab_alloc_node mm/slub.c:3367 [inline]
 slab_alloc_node mm/slub.c:3460 [inline]
 __kmem_cache_alloc_node+0x137/0x350 mm/slub.c:3509
 __do_kmalloc_node mm/slab_common.c:984 [inline]
 __kmalloc_node_track_caller+0x4d/0x100 mm/slab_common.c:1005
 kstrdup+0x3c/0x70 mm/util.c:62
 kstrdup_const+0x5f/0x70 mm/util.c:85
 __kernfs_new_node+0x9c/0x8a0 fs/kernfs/dir.c:607
 kernfs_new_node fs/kernfs/dir.c:675 [inline]
 kernfs_create_dir_ns+0x9a/0x210 fs/kernfs/dir.c:1036
 sysfs_create_dir_ns+0x13b/0x2a0 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:65 [inline]
 kobject_add_internal+0x2c8/0x990 lib/kobject.c:233
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888143fdc080: 00 04 fc fc fb fb fc fc fb fb fc fc fb fb fc fc
 ffff888143fdc100: 00 04 fc fc 00 04 fc fc 00 00 fc fc 00 00 fc fc
>ffff888143fdc180: 00 00 fc fc 00 04 fc fc 00 07 fc fc 00 04 fc fc
                                  ^
 ffff888143fdc200: 00 04 fc fc 00 04 fc fc 00 00 fc fc 00 00 fc fc
 ffff888143fdc280: fa fb fc fc fa fb fc fc 00 00 fc fc 00 07 fc fc
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/09/06 11:25 net f8fdd54ee6a1 8bc9053e .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce KASAN: slab-out-of-bounds Read in team_device_event
2023/09/06 07:39 net f8fdd54ee6a1 8bc9053e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce KASAN: slab-use-after-free Read in team_device_event
* Struck through repros no longer work on HEAD.