[syzbot] KASAN: use-after-free Write in gadgetfs_kill_sb

From: syzbot
Date: Tue Dec 13 2022 - 08:36:44 EST

Next message: Tomi Valkeinen: "Re: [PATCH v5 3/8] dt-bindings: media: add bindings for TI DS90UB913"
Previous message: Petr Pavlu: "Re: [PATCH v2] module: Don't wait for GOING modules"
Next in thread: Alan Stern: "Re: [syzbot] KASAN: use-after-free Write in gadgetfs_kill_sb"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Hello,

syzbot found the following issue on:

HEAD commit: 830b3c68c1fb Linux 6.1
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=137401b7880000
kernel config: https://syzkaller.appspot.com/x/.config?x=5a194ed4fc682723
dashboard link: https://syzkaller.appspot.com/bug?extid=33d7ad66d65044b93f16
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=176d36b7880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=109371b7880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/955d55d85d6c/disk-830b3c68.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7ef0e1f6a0c3/vmlinux-830b3c68.xz
kernel image: https://storage.googleapis.com/syzbot-assets/27601eb5ff0b/bzImage-830b3c68.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+33d7ad66d65044b93f16@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
BUG: KASAN: use-after-free in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:176 [inline]
BUG: KASAN: use-after-free in __refcount_sub_and_test include/linux/refcount.h:272 [inline]
BUG: KASAN: use-after-free in __refcount_dec_and_test include/linux/refcount.h:315 [inline]
BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:333 [inline]
BUG: KASAN: use-after-free in put_dev drivers/usb/gadget/legacy/inode.c:159 [inline]
BUG: KASAN: use-after-free in gadgetfs_kill_sb+0x33/0x100 drivers/usb/gadget/legacy/inode.c:2086
Write of size 4 at addr ffff8880276d7840 by task syz-executor126/18689

CPU: 0 PID: 18689 Comm: syz-executor126 Not tainted 6.1.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
print_address_description+0x74/0x340 mm/kasan/report.c:284
print_report+0x107/0x1f0 mm/kasan/report.c:395
kasan_report+0xcd/0x100 mm/kasan/report.c:495
kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189
instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:176 [inline]
__refcount_sub_and_test include/linux/refcount.h:272 [inline]
__refcount_dec_and_test include/linux/refcount.h:315 [inline]
refcount_dec_and_test include/linux/refcount.h:333 [inline]
put_dev drivers/usb/gadget/legacy/inode.c:159 [inline]
gadgetfs_kill_sb+0x33/0x100 drivers/usb/gadget/legacy/inode.c:2086
deactivate_locked_super+0xa7/0xf0 fs/super.c:332
vfs_get_super fs/super.c:1190 [inline]
get_tree_single+0xd0/0x160 fs/super.c:1207
vfs_get_tree+0x88/0x270 fs/super.c:1531
vfs_fsconfig_locked fs/fsopen.c:232 [inline]
__do_sys_fsconfig fs/fsopen.c:439 [inline]
__se_sys_fsconfig+0xbc0/0x1060 fs/fsopen.c:314
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f1ce0ecbdf9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff0005e5f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001af
RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f1ce0ecbdf9
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000206b5
R13: 00007fff0005e60c R14: 00007fff0005e620 R15: 00007fff0005e610
</TASK>

Allocated by task 18687:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x3d/0x60 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:371 [inline]
__kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380
kmalloc include/linux/slab.h:553 [inline]
kzalloc include/linux/slab.h:689 [inline]
dev_new drivers/usb/gadget/legacy/inode.c:170 [inline]
gadgetfs_fill_super+0x2f9/0x8a0 drivers/usb/gadget/legacy/inode.c:2041
vfs_get_super fs/super.c:1169 [inline]
get_tree_single+0xb4/0x160 fs/super.c:1207
vfs_get_tree+0x88/0x270 fs/super.c:1531
vfs_fsconfig_locked fs/fsopen.c:232 [inline]
__do_sys_fsconfig fs/fsopen.c:439 [inline]
__se_sys_fsconfig+0xbc0/0x1060 fs/fsopen.c:314
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 18687:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x3d/0x60 mm/kasan/common.c:52
kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:511
____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1750
slab_free mm/slub.c:3661 [inline]
__kmem_cache_free+0x71/0x110 mm/slub.c:3674
put_dev drivers/usb/gadget/legacy/inode.c:163 [inline]
gadgetfs_kill_sb+0x8a/0x100 drivers/usb/gadget/legacy/inode.c:2086
deactivate_locked_super+0xa7/0xf0 fs/super.c:332
put_fs_context+0x90/0x7a0 fs/fs_context.c:465
fscontext_release+0x61/0x80 fs/fsopen.c:73
__fput+0x3ba/0x880 fs/file_table.c:320
task_work_run+0x243/0x300 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0x664/0x2070 kernel/exit.c:820
do_group_exit+0x1fd/0x2b0 kernel/exit.c:950
__do_sys_exit_group kernel/exit.c:961 [inline]
__se_sys_exit_group kernel/exit.c:959 [inline]
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:959
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff8880276d7800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 64 bytes inside of
1024-byte region [ffff8880276d7800, ffff8880276d7c00)

The buggy address belongs to the physical page:
page:ffffea00009db400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x276d0
head:ffffea00009db400 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888012841dc0
raw: 0000000000000000 0000000000100010 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 3626, tgid 3626 (sshd), ts 64243807059, free_ts 64103482939
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4291
__alloc_pages+0x259/0x560 mm/page_alloc.c:5558
alloc_slab_page+0xbd/0x190 mm/slub.c:1794
allocate_slab+0x5e/0x4b0 mm/slub.c:1939
new_slab mm/slub.c:1992 [inline]
___slab_alloc+0x782/0xe20 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
__kmem_cache_alloc_node+0x252/0x310 mm/slub.c:3437
__do_kmalloc_node mm/slab_common.c:954 [inline]
__kmalloc_node_track_caller+0x9c/0x190 mm/slab_common.c:975
kmalloc_reserve net/core/skbuff.c:437 [inline]
__alloc_skb+0x112/0x2b0 net/core/skbuff.c:509
alloc_skb_fclone include/linux/skbuff.h:1317 [inline]
tcp_stream_alloc_skb+0x3c/0x300 net/ipv4/tcp.c:862
tcp_sendmsg_locked+0xd70/0x40d0 net/ipv4/tcp.c:1325
tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1483
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg net/socket.c:734 [inline]
sock_write_iter+0x3d4/0x540 net/socket.c:1108
call_write_iter include/linux/fs.h:2199 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x7dc/0xc50 fs/read_write.c:584
ksys_write+0x177/0x2a0 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1459 [inline]
free_pcp_prepare+0x80c/0x8f0 mm/page_alloc.c:1509
free_unref_page_prepare mm/page_alloc.c:3387 [inline]
free_unref_page+0x7d/0x5f0 mm/page_alloc.c:3483
free_slab mm/slub.c:2031 [inline]
discard_slab mm/slub.c:2037 [inline]
__unfreeze_partials+0x1ab/0x200 mm/slub.c:2586
put_cpu_partial+0x106/0x170 mm/slub.c:2662
qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:302
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slab.h:737 [inline]
slab_alloc_node mm/slub.c:3398 [inline]
kmem_cache_alloc_node+0x1ca/0x340 mm/slub.c:3443
__alloc_skb+0xcf/0x2b0 net/core/skbuff.c:497
alloc_skb_fclone include/linux/skbuff.h:1317 [inline]
tcp_stream_alloc_skb+0x3c/0x300 net/ipv4/tcp.c:862
tcp_sendmsg_locked+0xd70/0x40d0 net/ipv4/tcp.c:1325
tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1483
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg net/socket.c:734 [inline]
sock_write_iter+0x3d4/0x540 net/socket.c:1108
call_write_iter include/linux/fs.h:2199 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x7dc/0xc50 fs/read_write.c:584
ksys_write+0x177/0x2a0 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80

Memory state around the buggy address:
ffff8880276d7700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880276d7780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880276d7800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880276d7880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880276d7900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

---
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.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

Next message: Tomi Valkeinen: "Re: [PATCH v5 3/8] dt-bindings: media: add bindings for TI DS90UB913"
Previous message: Petr Pavlu: "Re: [PATCH v2] module: Don't wait for GOING modules"
Next in thread: Alan Stern: "Re: [syzbot] KASAN: use-after-free Write in gadgetfs_kill_sb"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]