syzbot


KASAN: slab-use-after-free Read in __lock_sock (2)

Status: upstream: reported C repro on 2024/06/16 09:53
Subsystems: bluetooth
[Documentation on labels]
Reported-by: syzbot+9486ac2c18a7693c45d6@syzkaller.appspotmail.com
First crash: 31d, last: 12d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bluetooth?] KASAN: slab-use-after-free Read in __lock_sock (2) 1 (3) 2024/06/17 11:12
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-use-after-free Read in __lock_sock bluetooth C 1 233d 233d 0/27 auto-obsoleted due to no activity on 2024/03/01 14:18
upstream KASAN: use-after-free Read in __lock_sock sctp syz done error 26 1249d 2065d 20/27 fixed on 2022/03/08 16:11
Last patch testing requests (4)
Created Duration User Patch Repo Result
2024/06/27 02:23 19m retest repro upstream report log
2024/06/27 02:23 19m retest repro upstream report log
2024/06/27 02:23 20m retest repro upstream report log
2024/06/17 10:48 22m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git cea2a26553ac OK log

Sample crash report:
==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x2dd6/0x3b30 kernel/locking/lockdep.c:5005
Read of size 8 at addr ffff88802857d1d8 by task kworker/u33:1/4634

CPU: 1 PID: 4634 Comm: kworker/u33:1 Not tainted 6.10.0-rc5-syzkaller-00282-g8282d5af7be8 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: hci0 hci_rx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:488
 kasan_report+0xd9/0x110 mm/kasan/report.c:601
 __lock_acquire+0x2dd6/0x3b30 kernel/locking/lockdep.c:5005
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
 _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:356 [inline]
 __lock_sock+0x147/0x270 net/core/sock.c:2960
 lock_sock_nested+0xda/0xf0 net/core/sock.c:3539
 lock_sock include/net/sock.h:1602 [inline]
 l2cap_sock_recv_cb+0x54/0x3d0 net/bluetooth/l2cap_sock.c:1488
 l2cap_conless_channel net/bluetooth/l2cap_core.c:6774 [inline]
 l2cap_recv_frame+0x1c4c/0x8e50 net/bluetooth/l2cap_core.c:6827
 l2cap_recv_acldata+0x9ac/0xb60 net/bluetooth/l2cap_core.c:7510
 hci_acldata_packet net/bluetooth/hci_core.c:3842 [inline]
 hci_rx_work+0xaa7/0x1610 net/bluetooth/hci_core.c:4079
 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3248
 process_scheduled_works kernel/workqueue.c:3329 [inline]
 worker_thread+0x6c8/0xf30 kernel/workqueue.c:3409
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 5252:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:4123 [inline]
 __kmalloc_noprof+0x1ec/0x410 mm/slub.c:4136
 kmalloc_noprof include/linux/slab.h:664 [inline]
 sk_prot_alloc+0x1a8/0x2a0 net/core/sock.c:2080
 sk_alloc+0x36/0xb90 net/core/sock.c:2133
 bt_sock_alloc+0x3b/0x3a0 net/bluetooth/af_bluetooth.c:148
 l2cap_sock_alloc.constprop.0+0x35/0x180 net/bluetooth/l2cap_sock.c:1869
 l2cap_sock_create+0x123/0x1f0 net/bluetooth/l2cap_sock.c:1909
 bt_sock_create+0x182/0x350 net/bluetooth/af_bluetooth.c:132
 __sock_create+0x32e/0x800 net/socket.c:1571
 sock_create net/socket.c:1622 [inline]
 __sys_socket_create net/socket.c:1659 [inline]
 __sys_socket+0x14f/0x260 net/socket.c:1706
 __do_sys_socket net/socket.c:1720 [inline]
 __se_sys_socket net/socket.c:1718 [inline]
 __x64_sys_socket+0x72/0xb0 net/socket.c:1718
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5252:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240
 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2196 [inline]
 slab_free mm/slub.c:4438 [inline]
 kfree+0x12a/0x3b0 mm/slub.c:4559
 sk_prot_free net/core/sock.c:2116 [inline]
 __sk_destruct+0x5d8/0x730 net/core/sock.c:2208
 sk_destruct+0xc2/0xf0 net/core/sock.c:2223
 __sk_free+0xf4/0x3e0 net/core/sock.c:2234
 sk_free+0x7c/0xa0 net/core/sock.c:2245
 sock_put include/net/sock.h:1879 [inline]
 l2cap_sock_kill net/bluetooth/l2cap_sock.c:1246 [inline]
 l2cap_sock_kill+0x22f/0x270 net/bluetooth/l2cap_sock.c:1235
 l2cap_sock_release+0x189/0x210 net/bluetooth/l2cap_sock.c:1417
 __sock_release+0xb0/0x270 net/socket.c:659
 sock_close+0x1c/0x30 net/socket.c:1421
 __fput+0x408/0xbb0 fs/file_table.c:422
 __fput_sync+0x47/0x50 fs/file_table.c:507
 __do_sys_close fs/open.c:1555 [inline]
 __se_sys_close fs/open.c:1540 [inline]
 __x64_sys_close+0x86/0x100 fs/open.c:1540
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802857d000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 472 bytes inside of
 freed 2048-byte region [ffff88802857d000, ffff88802857d800)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28578
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffefff(slab)
raw: 00fff00000000040 ffff888015442f00 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000080008 00000001ffffefff 0000000000000000
head: 00fff00000000040 ffff888015442f00 dead000000000122 0000000000000000
head: 0000000000000000 0000000000080008 00000001ffffefff 0000000000000000
head: 00fff00000000003 ffffea0000a15e01 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5248, tgid 5248 (syz-executor332), ts 54620783854, free_ts 54075826268
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1473
 prep_new_page mm/page_alloc.c:1481 [inline]
 get_page_from_freelist+0x1353/0x2e50 mm/page_alloc.c:3425
 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4683
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page+0x56/0x110 mm/slub.c:2265
 allocate_slab mm/slub.c:2428 [inline]
 new_slab+0x84/0x260 mm/slub.c:2481
 ___slab_alloc+0xdac/0x1870 mm/slub.c:3667
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3757
 __slab_alloc_node mm/slub.c:3810 [inline]
 slab_alloc_node mm/slub.c:3990 [inline]
 kmalloc_trace_noprof+0x2b4/0x300 mm/slub.c:4149
 kmalloc_noprof include/linux/slab.h:660 [inline]
 kzalloc_noprof include/linux/slab.h:778 [inline]
 l2cap_chan_create+0x44/0x920 net/bluetooth/l2cap_core.c:449
 l2cap_sock_alloc.constprop.0+0xf3/0x180 net/bluetooth/l2cap_sock.c:1878
 l2cap_sock_create+0x123/0x1f0 net/bluetooth/l2cap_sock.c:1909
 bt_sock_create+0x182/0x350 net/bluetooth/af_bluetooth.c:132
 __sock_create+0x32e/0x800 net/socket.c:1571
 sock_create net/socket.c:1622 [inline]
 __sys_socket_create net/socket.c:1659 [inline]
 __sys_socket+0x14f/0x260 net/socket.c:1706
 __do_sys_socket net/socket.c:1720 [inline]
 __se_sys_socket net/socket.c:1718 [inline]
 __x64_sys_socket+0x72/0xb0 net/socket.c:1718
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
page last free pid 5188 tgid 5188 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1093 [inline]
 free_unref_page+0x64a/0xe40 mm/page_alloc.c:2588
 __put_partials+0x14c/0x170 mm/slub.c:2995
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3940 [inline]
 slab_alloc_node mm/slub.c:4002 [inline]
 kmem_cache_alloc_node_noprof+0x153/0x310 mm/slub.c:4045
 __alloc_skb+0x2b1/0x380 net/core/skbuff.c:656
 alloc_skb_fclone include/linux/skbuff.h:1358 [inline]
 tcp_stream_alloc_skb+0x34/0x570 net/ipv4/tcp.c:879
 tcp_sendmsg_locked+0xecc/0x3550 net/ipv4/tcp.c:1161
 tcp_sendmsg+0x2e/0x50 net/ipv4/tcp.c:1351
 inet_sendmsg+0xb9/0x140 net/ipv4/af_inet.c:853
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 sock_write_iter+0x4b8/0x5c0 net/socket.c:1160
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6b6/0x1140 fs/read_write.c:590
 ksys_write+0x1f8/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88802857d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802857d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802857d180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff88802857d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802857d280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/30 16:06 upstream 8282d5af7be8 757f06b1 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in __lock_sock
2024/06/13 02:16 upstream cea2a26553ac c2e07261 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in __lock_sock
2024/06/13 02:03 upstream cea2a26553ac c2e07261 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in __lock_sock
2024/06/12 09:45 upstream 2ef5971ff345 c2e07261 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in __lock_sock
2024/06/28 12:02 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b4a3f9b4863a b62c7d46 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-use-after-free Read in __lock_sock
* Struck through repros no longer work on HEAD.