Messages in this thread | | | Date | Mon, 22 Apr 2024 08:35:25 -0700 | Subject | [syzbot] [pm?] KASAN: use-after-free Read in netdev_unregister_kobject | From | syzbot <> |
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Hello,
syzbot found the following issue on:
HEAD commit: 3cdb45594619 Merge tag 's390-6.9-4' of git://git.kernel.or.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=13d23353180000 kernel config: https://syzkaller.appspot.com/x/.config?x=d239903bd07761e5 dashboard link: https://syzkaller.appspot.com/bug?extid=6cf5652d3df49fae2e3f compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=172afcbf180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=144067cb180000
Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5135044ea611/disk-3cdb4559.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3c5a5ab80ba8/vmlinux-3cdb4559.xz kernel image: https://storage.googleapis.com/syzbot-assets/e215eb6531dd/bzImage-3cdb4559.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6cf5652d3df49fae2e3f@syzkaller.appspotmail.com
================================================================== BUG: KASAN: use-after-free in device_for_each_child+0xa7/0x170 drivers/base/core.c:4044 Read of size 8 at addr ffff88807bee95f8 by task kbnepd bnep0/5202
CPU: 0 PID: 5202 Comm: kbnepd bnep0 Not tainted 6.9.0-rc4-syzkaller-00173-g3cdb45594619 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 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 device_for_each_child+0xa7/0x170 drivers/base/core.c:4044 pm_runtime_set_memalloc_noio+0x114/0x260 drivers/base/power/runtime.c:248 netdev_unregister_kobject+0x178/0x250 net/core/net-sysfs.c:2106 unregister_netdevice_many_notify+0x11dd/0x16e0 net/core/dev.c:11135 unregister_netdevice_many net/core/dev.c:11163 [inline] unregister_netdevice_queue+0x303/0x370 net/core/dev.c:11042 unregister_netdevice include/linux/netdevice.h:3115 [inline] unregister_netdev+0x1c/0x30 net/core/dev.c:11181 bnep_session+0x2e09/0x3000 net/bluetooth/bnep/core.c:525 kthread+0x2f2/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK>
The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x400000000 pfn:0x7bee9 flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffffff() raw: 00fff80000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000400000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 2, migratetype Unmovable, gfp_mask 0x40dc0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), pid 5095, tgid -432259438 (syz-executor223), ts 5095, free_ts 96070220809 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317 __alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] __kmalloc_large_node+0x91/0x1f0 mm/slub.c:3911 __do_kmalloc_node mm/slub.c:3954 [inline] __kmalloc+0x320/0x4a0 mm/slub.c:3979 kmalloc include/linux/slab.h:632 [inline] kzalloc include/linux/slab.h:749 [inline] hci_alloc_dev_priv+0x27/0x2030 net/bluetooth/hci_core.c:2500 hci_alloc_dev include/net/bluetooth/hci_core.h:1672 [inline] __vhci_create_device drivers/bluetooth/hci_vhci.c:406 [inline] vhci_create_device+0x12e/0x720 drivers/bluetooth/hci_vhci.c:480 vhci_get_user drivers/bluetooth/hci_vhci.c:537 [inline] vhci_write+0x3cb/0x480 drivers/bluetooth/hci_vhci.c:617 call_write_iter include/linux/fs.h:2110 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa86/0xcb0 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5095 tgid 5095 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x986/0xab0 mm/page_alloc.c:2347 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487 __folio_put_large+0x13f/0x190 mm/swap.c:132 __folio_put+0x299/0x390 mm/swap.c:140 folio_put include/linux/mm.h:1506 [inline] free_large_kmalloc+0x105/0x1c0 mm/slub.c:4361 kfree+0x1ca/0x3a0 mm/slub.c:4384 hci_release_dev+0x1516/0x16a0 net/bluetooth/hci_core.c:2833 bt_host_release+0x83/0x90 net/bluetooth/hci_sysfs.c:94 device_release+0x9b/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+0x231/0x480 lib/kobject.c:737 vhci_release+0x8b/0xd0 drivers/bluetooth/hci_vhci.c:675 __fput+0x42b/0x8a0 fs/file_table.c:422 task_work_run+0x251/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa1b/0x27e0 kernel/exit.c:878 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 __do_sys_exit_group kernel/exit.c:1038 [inline] __se_sys_exit_group kernel/exit.c:1036 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036
Memory state around the buggy address: ffff88807bee9480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88807bee9500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88807bee9580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88807bee9600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88807bee9680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================
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