Re: [syzbot] [usb?] KASAN: slab-use-after-free Read in raw_process_ep_io

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On Mon, Sep 16, 2024 at 11:10 PM syzbot
<syzbot+1412b4c05666882f1a0d@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    20371ba12063 Merge tag 'drm-fixes-2024-08-30' of https://g..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=17be4453980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c33ac4f18fd4c6c7
> dashboard link: https://syzkaller.appspot.com/bug?extid=1412b4c05666882f1a0d
> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> userspace arch: i386
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-20371ba1.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/6c05996bb727/vmlinux-20371ba1.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/88ec4a9fc0cc/bzImage-20371ba1.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+1412b4c05666882f1a0d@xxxxxxxxxxxxxxxxxxxxxxxxx
>
> usblp0: error -71 reading from printer
> ==================================================================
> BUG: KASAN: slab-use-after-free in usb_endpoint_dir_in include/uapi/linux/usb/ch9.h:494 [inline]
> BUG: KASAN: slab-use-after-free in raw_process_ep_io+0x848/0xb90 drivers/usb/gadget/legacy/raw_gadget.c:1098
> Read of size 1 at addr ffff8880125e09e2 by task syz.3.365/6589
>
> CPU: 2 UID: 0 PID: 6589 Comm: syz.3.365 Not tainted 6.11.0-rc5-syzkaller-00176-g20371ba12063 #0
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> Call Trace:
>  <TASK>
>  __dump_stack lib/dump_stack.c:93 [inline]
>  dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119
>  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
>  usb_endpoint_dir_in include/uapi/linux/usb/ch9.h:494 [inline]
>  raw_process_ep_io+0x848/0xb90 drivers/usb/gadget/legacy/raw_gadget.c:1098
>  raw_ioctl_ep_write drivers/usb/gadget/legacy/raw_gadget.c:1152 [inline]
>  raw_ioctl+0xc9c/0x2a50 drivers/usb/gadget/legacy/raw_gadget.c:1324
>  __do_compat_sys_ioctl+0x2c3/0x330 fs/ioctl.c:1007
>  do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
>  __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
>  do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
>  entry_SYSENTER_compat_after_hwframe+0x84/0x8e
> RIP: 0023:0xf7f68579
> Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
> RSP: 002b:00000000f5705514 EFLAGS: 00000292 ORIG_RAX: 0000000000000036
> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000040085507
> RDX: 00000000f5705558 RSI: 00000000f73f0ff4 RDI: 00000000f57055e4
> RBP: 00000000f5706578 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>  </TASK>
>
> Allocated by task 6592:
>  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:4158 [inline]
>  __kmalloc_node_track_caller_noprof+0x20f/0x440 mm/slub.c:4177
>  memdup_user+0x2a/0xd0 mm/util.c:226
>  raw_ioctl_ep_enable drivers/usb/gadget/legacy/raw_gadget.c:847 [inline]
>  raw_ioctl+0x105d/0x2a50 drivers/usb/gadget/legacy/raw_gadget.c:1318
>  __do_compat_sys_ioctl+0x2c3/0x330 fs/ioctl.c:1007
>  do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
>  __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
>  do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
>  entry_SYSENTER_compat_after_hwframe+0x84/0x8e
>
> Freed by task 6589:
>  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:2252 [inline]
>  slab_free mm/slub.c:4473 [inline]
>  kfree+0x12a/0x3b0 mm/slub.c:4594
>  dev_free+0x446/0x700 drivers/usb/gadget/legacy/raw_gadget.c:225
>  kref_put include/linux/kref.h:65 [inline]
>  raw_release+0x16e/0x2c0 drivers/usb/gadget/legacy/raw_gadget.c:473
>  __fput+0x408/0xbb0 fs/file_table.c:422
>  __fput_sync+0x47/0x50 fs/file_table.c:507
>  __do_sys_close fs/open.c:1566 [inline]
>  __se_sys_close fs/open.c:1551 [inline]
>  __ia32_sys_close+0x86/0x100 fs/open.c:1551
>  do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
>  __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
>  do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
>  entry_SYSENTER_compat_after_hwframe+0x84/0x8e
>
> The buggy address belongs to the object at ffff8880125e09e0
>  which belongs to the cache kmalloc-16 of size 16
> The buggy address is located 2 bytes inside of
>  freed 16-byte region [ffff8880125e09e0, ffff8880125e09f0)
>
> The buggy address belongs to the physical page:
> page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880125e0ce0 pfn:0x125e0
> flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
> page_type: 0xfdffffff(slab)
> raw: 00fff00000000200 ffff88801ac42640 ffffea00008a5b10 ffff88801ac40408
> raw: ffff8880125e0ce0 0000000000800076 00000001fdffffff 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 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 5359, tgid 5359 (syz-executor), ts 61887753741, free_ts 58155057252
>  set_page_owner include/linux/page_owner.h:32 [inline]
>  post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1493
>  prep_new_page mm/page_alloc.c:1501 [inline]
>  get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3439
>  __alloc_pages_slowpath mm/page_alloc.c:4228 [inline]
>  __alloc_pages_noprof+0x6ad/0x2460 mm/page_alloc.c:4708
>  __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
>  alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
>  alloc_slab_page+0x4e/0xf0 mm/slub.c:2321
>  allocate_slab mm/slub.c:2484 [inline]
>  new_slab+0x84/0x260 mm/slub.c:2537
>  ___slab_alloc+0xdac/0x1870 mm/slub.c:3723
>  __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3813
>  __slab_alloc_node mm/slub.c:3866 [inline]
>  slab_alloc_node mm/slub.c:4025 [inline]
>  __do_kmalloc_node mm/slub.c:4157 [inline]
>  __kmalloc_node_noprof+0x367/0x440 mm/slub.c:4164
>  __kvmalloc_node_noprof+0x9d/0x1a0 mm/util.c:650
>  xt_jumpstack_alloc net/netfilter/x_tables.c:1355 [inline]
>  xt_replace_table+0x1c7/0x910 net/netfilter/x_tables.c:1394
>  __do_replace+0x1d9/0x9c0 net/ipv4/netfilter/arp_tables.c:912
>  compat_do_replace+0x3ca/0x500 net/ipv4/netfilter/ip_tables.c:1529
>  do_ip6t_set_ctl+0x686/0xc20 net/ipv6/netfilter/ip6_tables.c:1641
>  nf_setsockopt+0x8a/0xf0 net/netfilter/nf_sockopt.c:101
>  ipv6_setsockopt+0x133/0x1a0 net/ipv6/ipv6_sockglue.c:998
>  tcp_setsockopt+0xa4/0x100 net/ipv4/tcp.c:3768
> page last free pid 5359 tgid 5359 stack trace:
>  reset_page_owner include/linux/page_owner.h:25 [inline]
>  free_pages_prepare mm/page_alloc.c:1094 [inline]
>  free_unref_page+0x64a/0xe40 mm/page_alloc.c:2612
>  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:3988 [inline]
>  slab_alloc_node mm/slub.c:4037 [inline]
>  __kmalloc_cache_noprof+0x11e/0x310 mm/slub.c:4184
>  kmalloc_noprof include/linux/slab.h:681 [inline]
>  kzalloc_noprof include/linux/slab.h:807 [inline]
>  kset_create lib/kobject.c:965 [inline]
>  kset_create_and_add+0x4d/0x190 lib/kobject.c:1008
>  register_queue_kobjects net/core/net-sysfs.c:1887 [inline]
>  netdev_register_kobject+0x1cd/0x3f0 net/core/net-sysfs.c:2140
>  register_netdevice+0x1473/0x1e20 net/core/dev.c:10444
>  veth_newlink+0x4fb/0x9e0 drivers/net/veth.c:1860
>  rtnl_newlink_create net/core/rtnetlink.c:3510 [inline]
>  __rtnl_newlink+0x119c/0x1920 net/core/rtnetlink.c:3730
>  rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3743
>  rtnetlink_rcv_msg+0x3c7/0xea0 net/core/rtnetlink.c:6647
>  netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2550
>  netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
>  netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1357
>  netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1901
>  sock_sendmsg_nosec net/socket.c:730 [inline]
>  __sock_sendmsg net/socket.c:745 [inline]
>  __sys_sendto+0x47f/0x4e0 net/socket.c:2204
>
> Memory state around the buggy address:
>  ffff8880125e0880: 00 00 fc fc 00 00 fc fc 00 00 fc fc 00 00 fc fc
>  ffff8880125e0900: 00 00 fc fc fa fb fc fc 00 00 fc fc 00 03 fc fc
> >ffff8880125e0980: 00 01 fc fc 00 00 fc fc 00 03 fc fc fa fb fc fc
>                                                        ^
>  ffff8880125e0a00: 00 03 fc fc 00 00 fc fc 00 04 fc fc 00 00 fc fc
>  ffff8880125e0a80: 00 00 fc fc 00 04 fc fc 00 00 fc fc 00 00 fc fc
> ==================================================================
> ----------------
> Code disassembly (best guess), 2 bytes skipped:
>    0:   10 06                   adc    %al,(%rsi)
>    2:   03 74 b4 01             add    0x1(%rsp,%rsi,4),%esi
>    6:   10 07                   adc    %al,(%rdi)
>    8:   03 74 b0 01             add    0x1(%rax,%rsi,4),%esi
>    c:   10 08                   adc    %cl,(%rax)
>    e:   03 74 d8 01             add    0x1(%rax,%rbx,8),%esi
>   1e:   00 51 52                add    %dl,0x52(%rcx)
>   21:   55                      push   %rbp
>   22:   89 e5                   mov    %esp,%ebp
>   24:   0f 34                   sysenter
>   26:   cd 80                   int    $0x80
> * 28:   5d                      pop    %rbp <-- trapping instruction
>   29:   5a                      pop    %rdx
>   2a:   59                      pop    %rcx
>   2b:   c3                      ret
>   2c:   90                      nop
>   2d:   90                      nop
>   2e:   90                      nop
>   2f:   90                      nop
>   30:   8d b4 26 00 00 00 00    lea    0x0(%rsi,%riz,1),%esi
>   37:   8d b4 26 00 00 00 00    lea    0x0(%rsi,%riz,1),%esi
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want to overwrite report's subsystems, reply with:
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> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup

#syz dup: KASAN: invalid-free in dev_free





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