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SubjectRe: KASAN: use-after-free Read in cfusbl_device_notify
On Fri, Jun 24, 2022 at 8:08 AM Dae R. Jeong <threeearcat@gmail.com> wrote:
>
> Hello,
>
> We observed a crash "KASAN: use-after-free Read in cfusbl_device_notify" during fuzzing.
>
> Unfortunately, we have not found a reproducer for the crash yet. We
> will inform you if we have any update on this crash.
>
> Detailed crash information is attached at the end of this email.
>
>
> Best regards,
> Dae R. Jeong.
> ------
>
> - Kernel commit:
> b13baccc3850ca
>
> - Crash report:
> ==================================================================
> BUG: KASAN: use-after-free in cfusbl_device_notify+0x155/0xf40 net/caif/caif_usb.c:138
> Read of size 8 at addr ffff88804bc4c6f0 by task kworker/u8:0/18109

This is a known problem.

Some drivers do not like NETDEV_UNREGISTER being delivered multiple times.

Make sure in your fuzzing to have NET_DEV_REFCNT_TRACKER=y

Thanks.


>
> CPU: 1 PID: 18109 Comm: kworker/u8:0 Not tainted 5.19.0-rc2-31838-gef9c98f9637f #2
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
> Workqueue: netns cleanup_net
> Call Trace:
> <TASK>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0x240/0x35a lib/dump_stack.c:106
> print_address_description+0x65/0x4f0 mm/kasan/report.c:313
> print_report+0xf4/0x1e0 mm/kasan/report.c:429
> kasan_report+0xe5/0x110 mm/kasan/report.c:491
> cfusbl_device_notify+0x155/0xf40 net/caif/caif_usb.c:138
> notifier_call_chain kernel/notifier.c:87 [inline]
> raw_notifier_call_chain+0xd4/0x170 kernel/notifier.c:455
> call_netdevice_notifiers_info net/core/dev.c:1943 [inline]
> call_netdevice_notifiers_extack net/core/dev.c:1981 [inline]
> call_netdevice_notifiers net/core/dev.c:1995 [inline]
> netdev_wait_allrefs_any net/core/dev.c:10225 [inline]
> netdev_run_todo+0x14e6/0x23c0 net/core/dev.c:10337
> default_device_exit_batch+0x99a/0xa10 net/core/dev.c:11329
> ops_exit_list net/core/net_namespace.c:167 [inline]
> cleanup_net+0xd23/0x15a0 net/core/net_namespace.c:594
> process_one_work+0x909/0x12b0 kernel/workqueue.c:2289
> worker_thread+0xab1/0x1320 kernel/workqueue.c:2436
> kthread+0x294/0x330 kernel/kthread.c:376
> ret_from_fork+0x1f/0x30
> </TASK>
>
> Allocated by task 6688:
> kasan_save_stack mm/kasan/common.c:38 [inline]
> kasan_set_track mm/kasan/common.c:45 [inline]
> set_alloc_info mm/kasan/common.c:436 [inline]
> ____kasan_kmalloc mm/kasan/common.c:515 [inline]
> __kasan_kmalloc+0xac/0xe0 mm/kasan/common.c:524
> kasan_kmalloc include/linux/kasan.h:234 [inline]
> __kmalloc_node+0xed/0x780 mm/slub.c:4465
> kmalloc_node include/linux/slab.h:623 [inline]
> kvmalloc_node+0x6e/0x1a0 mm/util.c:613
> kvmalloc include/linux/slab.h:750 [inline]
> kvzalloc include/linux/slab.h:758 [inline]
> alloc_netdev_mqs+0x94/0x1da0 net/core/dev.c:10576
> rtnl_create_link+0x4ec/0x1360 net/core/rtnetlink.c:3241
> veth_newlink+0x4a9/0x1810 drivers/net/veth.c:1749
> rtnl_newlink_create net/core/rtnetlink.c:3363 [inline]
> __rtnl_newlink net/core/rtnetlink.c:3580 [inline]
> rtnl_newlink+0x251d/0x2fc0 net/core/rtnetlink.c:3593
> rtnetlink_rcv_msg+0x1103/0x1a60 net/core/rtnetlink.c:6089
> netlink_rcv_skb+0x2b6/0x670 net/netlink/af_netlink.c:2501
> netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
> netlink_unicast+0xc68/0xff0 net/netlink/af_netlink.c:1345
> netlink_sendmsg+0x11a0/0x1680 net/netlink/af_netlink.c:1921
> sock_sendmsg_nosec net/socket.c:693 [inline]
> sock_sendmsg net/socket.c:713 [inline]
> __sys_sendto+0x544/0x770 net/socket.c:2098
> __do_sys_sendto net/socket.c:2110 [inline]
> __se_sys_sendto net/socket.c:2106 [inline]
> __x64_sys_sendto+0x1bb/0x250 net/socket.c:2106
> do_syscall_x64 arch/x86/entry/common.c:51 [inline]
> do_syscall_64+0x4e/0xa0 arch/x86/entry/common.c:82
> entry_SYSCALL_64_after_hwframe+0x46/0xb0
>
> Freed by task 18109:
> kasan_save_stack mm/kasan/common.c:38 [inline]
> kasan_set_track+0x3d/0x60 mm/kasan/common.c:45
> kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370
> ____kasan_slab_free+0xb2/0xf0 mm/kasan/common.c:366
> kasan_slab_free include/linux/kasan.h:200 [inline]
> slab_free_hook mm/slub.c:1727 [inline]
> slab_free_freelist_hook+0x20c/0x540 mm/slub.c:1753
> slab_free mm/slub.c:3507 [inline]
> kfree+0x117/0x7e0 mm/slub.c:4555
> device_release+0xf5/0x390
> kobject_cleanup+0x340/0x4e0 lib/kobject.c:673
> netdev_run_todo+0x211c/0x23c0 net/core/dev.c:10358
> default_device_exit_batch+0x99a/0xa10 net/core/dev.c:11329
> ops_exit_list net/core/net_namespace.c:167 [inline]
> cleanup_net+0xd23/0x15a0 net/core/net_namespace.c:594
> process_one_work+0x909/0x12b0 kernel/workqueue.c:2289
> worker_thread+0xab1/0x1320 kernel/workqueue.c:2436
> kthread+0x294/0x330 kernel/kthread.c:376
> ret_from_fork+0x1f/0x30
>
> The buggy address belongs to the object at ffff88804bc4c000
> which belongs to the cache kmalloc-cg-4k of size 4096
> The buggy address is located 1776 bytes inside of
> 4096-byte region [ffff88804bc4c000, ffff88804bc4d000)
>
> The buggy address belongs to the physical page:
> page:ffffea00012f1200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4bc48
> head:ffffea00012f1200 order:3 compound_mapcount:0 compound_pincount:0
> flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
> raw: 00fff00000010200 0000000000000000 dead000000000122 ffff88801844c140
> 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 6688, tgid 6688 (syz-executor.0), ts 297836664488, free_ts 31867390869
> prep_new_page mm/page_alloc.c:2456 [inline]
> get_page_from_freelist+0xa7c/0xf50 mm/page_alloc.c:4198
> __alloc_pages+0x30e/0x710 mm/page_alloc.c:5426
> alloc_slab_page+0x66/0x250 mm/slub.c:1797
> allocate_slab+0xc0/0xe40 mm/slub.c:1942
> new_slab mm/slub.c:2002 [inline]
> ___slab_alloc+0x629/0x17a0 mm/slub.c:3002
> __slab_alloc mm/slub.c:3089 [inline]
> slab_alloc_node mm/slub.c:3180 [inline]
> slab_alloc mm/slub.c:3222 [inline]
> __kmalloc_track_caller+0x53a/0x600 mm/slub.c:4919
> kmemdup+0x21/0x50 mm/util.c:129
> _Z7kmemdupPKvU17pass_object_size0mj include/linux/fortify-string.h:456 [inline]
> __addrconf_sysctl_register+0x97/0x680 net/ipv6/addrconf.c:7061
> addrconf_sysctl_register+0x1c3/0x2a0 net/ipv6/addrconf.c:7126
> ipv6_add_dev+0x170e/0x1f80 net/ipv6/addrconf.c:450
> addrconf_notify+0xa36/0x3730 net/ipv6/addrconf.c:3532
> notifier_call_chain kernel/notifier.c:87 [inline]
> raw_notifier_call_chain+0xd4/0x170 kernel/notifier.c:455
> call_netdevice_notifiers_info net/core/dev.c:1943 [inline]
> call_netdevice_notifiers_extack net/core/dev.c:1981 [inline]
> call_netdevice_notifiers net/core/dev.c:1995 [inline]
> register_netdevice+0x23b1/0x32c0 net/core/dev.c:10078
> hsr_dev_finalize+0x803/0xd50 net/hsr/hsr_device.c:539
> hsr_newlink+0xba5/0xcf0 net/hsr/hsr_netlink.c:102
> rtnl_newlink_create net/core/rtnetlink.c:3363 [inline]
> __rtnl_newlink net/core/rtnetlink.c:3580 [inline]
> rtnl_newlink+0x251d/0x2fc0 net/core/rtnetlink.c:3593
> page last free stack trace:
> reset_page_owner include/linux/page_owner.h:24 [inline]
> free_pages_prepare mm/page_alloc.c:1371 [inline]
> free_pcp_prepare+0xa65/0xc90 mm/page_alloc.c:1421
> free_unref_page_prepare mm/page_alloc.c:3343 [inline]
> free_unref_page+0x7e/0x740 mm/page_alloc.c:3438
> free_contig_range+0xd9/0x240 mm/page_alloc.c:9314
> destroy_args+0x153/0xee4 mm/debug_vm_pgtable.c:1031
> debug_vm_pgtable+0x4bd/0x553 mm/debug_vm_pgtable.c:1354
> do_one_initcall+0x1a8/0x410 init/main.c:1295
> do_initcall_level+0x168/0x21d init/main.c:1368
> do_initcalls+0x50/0x91 init/main.c:1384
> kernel_init_freeable+0x40d/0x59a init/main.c:1610
> kernel_init+0x19/0x2c0 init/main.c:1499
> ret_from_fork+0x1f/0x30
>
> Memory state around the buggy address:
> ffff88804bc4c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff88804bc4c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >ffff88804bc4c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ^
> ffff88804bc4c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff88804bc4c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ==================================================================

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