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

Status: upstream: reported on 2024/05/17 08:44
Subsystems: bluetooth
[Documentation on labels]
Reported-by: syzbot+683f8cb11b94b1824c77@syzkaller.appspotmail.com
First crash: 33d, last: 1d17h
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bluetooth?] KASAN: slab-use-after-free Read in skb_queue_purge_reason (2) 0 (1) 2024/05/17 08:44
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-use-after-free Read in skb_queue_purge_reason bluetooth 1 170d 166d 0/27 auto-obsoleted due to no activity on 2024/03/26 16:32

Sample crash report:
==================================================================
BUG: KASAN: slab-use-after-free in skb_queue_empty_lockless include/linux/skbuff.h:1840 [inline]
BUG: KASAN: slab-use-after-free in skb_queue_purge_reason+0x37b/0x410 net/core/skbuff.c:3877
Read of size 8 at addr ffff88807db81058 by task syz-executor.3/17535

CPU: 0 PID: 17535 Comm: syz-executor.3 Not tainted 6.10.0-rc3-syzkaller-00022-gcea2a26553ac #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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
 skb_queue_empty_lockless include/linux/skbuff.h:1840 [inline]
 skb_queue_purge_reason+0x37b/0x410 net/core/skbuff.c:3877
 vhci_flush+0x40/0x50 drivers/bluetooth/hci_vhci.c:65
 hci_dev_do_reset net/bluetooth/hci_core.c:625 [inline]
 hci_dev_reset+0x22e/0x530 net/bluetooth/hci_core.c:665
 hci_sock_ioctl+0x3d2/0x880 net/bluetooth/hci_sock.c:1133
 sock_do_ioctl+0x116/0x280 net/socket.c:1222
 sock_ioctl+0x22e/0x6c0 net/socket.c:1341
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:893
 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
RIP: 0033:0x7f956767cea9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f956840d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f95677b4050 RCX: 00007f956767cea9
RDX: 0000000000000000 RSI: 00000000400448cb RDI: 0000000000000008
RBP: 00007f95676ebff4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f95677b4050 R15: 00007ffc6177cf48
 </TASK>

Allocated by task 17234:
 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
 kmalloc_noprof include/linux/slab.h:660 [inline]
 kzalloc_noprof include/linux/slab.h:778 [inline]
 vhci_open+0x4c/0x440 drivers/bluetooth/hci_vhci.c:636
 misc_open+0x3da/0x4c0 drivers/char/misc.c:165
 chrdev_open+0x26d/0x6f0 fs/char_dev.c:414
 do_dentry_open+0x910/0x1930 fs/open.c:955
 do_open fs/namei.c:3650 [inline]
 path_openat+0x1e3a/0x29f0 fs/namei.c:3807
 do_filp_open+0x1dc/0x430 fs/namei.c:3834
 do_sys_openat2+0x17a/0x1e0 fs/open.c:1405
 do_sys_open fs/open.c:1420 [inline]
 __do_sys_openat fs/open.c:1436 [inline]
 __se_sys_openat fs/open.c:1431 [inline]
 __x64_sys_openat+0x175/0x210 fs/open.c:1431
 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 17234:
 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:4437 [inline]
 kfree+0x12a/0x3b0 mm/slub.c:4558
 vhci_release+0xc4/0x100 drivers/bluetooth/hci_vhci.c:672
 __fput+0x408/0xbb0 fs/file_table.c:422
 task_work_run+0x14e/0x250 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa9b/0x2ba0 kernel/exit.c:874
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1023
 __do_sys_exit_group kernel/exit.c:1034 [inline]
 __se_sys_exit_group kernel/exit.c:1032 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1032
 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 ffff88807db81000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 88 bytes inside of
 freed 1024-byte region [ffff88807db81000, ffff88807db81400)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7db80
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffefff(slab)
raw: 00fff00000000040 ffff888015441dc0 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000001ffffefff 0000000000000000
head: 00fff00000000040 ffff888015441dc0 0000000000000000 dead000000000001
head: 0000000000000000 0000000000100010 00000001ffffefff 0000000000000000
head: 00fff00000000003 ffffea0001f6e001 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_NOMEMALLOC), pid 4887, tgid 4887 (dhcpcd), ts 76500517859, free_ts 76413306886
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1468
 prep_new_page mm/page_alloc.c:1476 [inline]
 get_page_from_freelist+0x136a/0x2e50 mm/page_alloc.c:3420
 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4678
 __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:3989 [inline]
 __do_kmalloc_node mm/slub.c:4121 [inline]
 kmalloc_node_track_caller_noprof+0x355/0x430 mm/slub.c:4142
 kmemdup_noprof+0x29/0x60 mm/util.c:131
 kmemdup_noprof include/linux/fortify-string.h:757 [inline]
 bpf_prog_store_orig_filter+0xff/0x1d0 net/core/filter.c:1154
 bpf_prog_create_from_user+0x1c3/0x2d0 net/core/filter.c:1438
 seccomp_prepare_filter kernel/seccomp.c:680 [inline]
 seccomp_prepare_user_filter kernel/seccomp.c:717 [inline]
 seccomp_set_mode_filter kernel/seccomp.c:1935 [inline]
 do_seccomp+0x7b6/0x2580 kernel/seccomp.c:2055
 prctl_set_seccomp+0x4b/0x70 kernel/seccomp.c:2108
 __do_sys_prctl+0xc83/0x1e40 kernel/sys.c:2539
 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
page last free pid 4885 tgid 4885 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1088 [inline]
 free_unref_page+0x64a/0xe40 mm/page_alloc.c:2583
 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:3941 [inline]
 slab_alloc_node mm/slub.c:4001 [inline]
 kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4008
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:139
 getname_flags include/linux/audit.h:322 [inline]
 getname+0x8f/0xe0 fs/namei.c:218
 do_sys_openat2+0x104/0x1e0 fs/open.c:1399
 do_sys_open fs/open.c:1420 [inline]
 __do_sys_openat fs/open.c:1436 [inline]
 __se_sys_openat fs/open.c:1431 [inline]
 __x64_sys_openat+0x175/0x210 fs/open.c:1431
 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:
 ffff88807db80f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807db80f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807db81000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff88807db81080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807db81100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/13 10:47 upstream cea2a26553ac 2aa5052f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: slab-use-after-free Read in skb_queue_purge_reason
2024/06/04 16:36 upstream f06ce441457d a1feae05 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: slab-use-after-free Read in skb_queue_purge_reason
2024/06/12 04:27 net 36534d3c5453 4d75f4f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce KASAN: slab-use-after-free Read in skb_queue_purge_reason
2024/06/11 09:47 net 36534d3c5453 048c640a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce KASAN: slab-use-after-free Read in skb_queue_purge_reason
2024/05/16 11:00 net 621cde16e49b ef5d53ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce KASAN: slab-use-after-free Read in skb_queue_purge_reason
2024/05/12 23:06 net 1164057b3c00 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce KASAN: slab-use-after-free Read in skb_queue_purge_reason
2024/05/23 05:04 net-next 4b377b4868ef 4d098039 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce KASAN: slab-use-after-free Read in skb_queue_purge_reason
2024/06/01 18:34 linux-next 0e1980c40b6e 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-use-after-free Read in skb_queue_purge_reason
* Struck through repros no longer work on HEAD.