[syzbot] [f2fs?] KASAN: slab-use-after-free Read in kill_f2fs_super

From: syzbot
Date: Fri Jan 12 2024 - 12:48:40 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 70d201a40823 Merge tag 'f2fs-for-6.8-rc1' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17e19adbe80000
kernel config: https://syzkaller.appspot.com/x/.config?x=4607bc15d1c4bb90
dashboard link: https://syzkaller.appspot.com/bug?extid=8f477ac014ff5b32d81f
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4faf0f99e43c/disk-70d201a4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/23f59e40d2ef/vmlinux-70d201a4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a0bc6007f0a4/bzImage-70d201a4.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8f477ac014ff5b32d81f@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: slab-use-after-free in destroy_device_list fs/f2fs/super.c:1606 [inline]
BUG: KASAN: slab-use-after-free in kill_f2fs_super+0x618/0x690 fs/f2fs/super.c:4932
Read of size 4 at addr ffff88801e12d77c by task syz-executor.1/9994

CPU: 1 PID: 9994 Comm: syz-executor.1 Not tainted 6.7.0-syzkaller-06264-g70d201a40823 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x163/0x540 mm/kasan/report.c:488
kasan_report+0x142/0x170 mm/kasan/report.c:601
destroy_device_list fs/f2fs/super.c:1606 [inline]
kill_f2fs_super+0x618/0x690 fs/f2fs/super.c:4932
deactivate_locked_super+0xc1/0x130 fs/super.c:477
mount_bdev+0x222/0x2d0 fs/super.c:1665
legacy_get_tree+0xef/0x190 fs/fs_context.c:662
vfs_get_tree+0x8c/0x2a0 fs/super.c:1784
do_new_mount+0x2be/0xb40 fs/namespace.c:3352
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f0966e7e4aa
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f0967ca6ef8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f0967ca6f80 RCX: 00007f0966e7e4aa
RDX: 0000000020000040 RSI: 0000000020000080 RDI: 00007f0967ca6f40
RBP: 0000000020000040 R08: 00007f0967ca6f80 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000080
R13: 00007f0967ca6f40 R14: 00000000000054f9 R15: 00000000200004c0
</TASK>

Allocated by task 9994:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x70 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:372 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:389
kasan_kmalloc include/linux/kasan.h:211 [inline]
kmalloc_trace+0x1d6/0x360 mm/slub.c:4012
kmalloc include/linux/slab.h:590 [inline]
kzalloc include/linux/slab.h:711 [inline]
f2fs_fill_super+0xce/0x8170 fs/f2fs/super.c:4397
mount_bdev+0x206/0x2d0 fs/super.c:1663
legacy_get_tree+0xef/0x190 fs/fs_context.c:662
vfs_get_tree+0x8c/0x2a0 fs/super.c:1784
do_new_mount+0x2be/0xb40 fs/namespace.c:3352
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b

Freed by task 9994:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x70 mm/kasan/common.c:68
kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:634
poison_slab_object+0xa6/0xe0 mm/kasan/common.c:241
__kasan_slab_free+0x34/0x60 mm/kasan/common.c:257
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2121 [inline]
slab_free mm/slub.c:4299 [inline]
kfree+0x14a/0x380 mm/slub.c:4409
f2fs_fill_super+0x6b04/0x8170 fs/f2fs/super.c:4882
mount_bdev+0x206/0x2d0 fs/super.c:1663
legacy_get_tree+0xef/0x190 fs/fs_context.c:662
vfs_get_tree+0x8c/0x2a0 fs/super.c:1784
do_new_mount+0x2be/0xb40 fs/namespace.c:3352
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b

The buggy address belongs to the object at ffff88801e12c000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 6012 bytes inside of
freed 8192-byte region [ffff88801e12c000, ffff88801e12e000)

The buggy address belongs to the physical page:
page:ffffea0000784a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1e128
head:ffffea0000784a00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888012c42280 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000020002 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 5039, tgid 5039 (syz-executor), ts 52116408241, free_ts 43224752194
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1533
prep_new_page mm/page_alloc.c:1540 [inline]
get_page_from_freelist+0x33ea/0x3570 mm/page_alloc.c:3311
__alloc_pages+0x255/0x680 mm/page_alloc.c:4567
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
alloc_slab_page+0x5f/0x160 mm/slub.c:2190
allocate_slab mm/slub.c:2354 [inline]
new_slab+0x84/0x2f0 mm/slub.c:2407
___slab_alloc+0xd17/0x13d0 mm/slub.c:3540
__slab_alloc mm/slub.c:3625 [inline]
__slab_alloc_node mm/slub.c:3678 [inline]
slab_alloc_node mm/slub.c:3850 [inline]
kmalloc_trace+0x25d/0x360 mm/slub.c:4007
kmalloc include/linux/slab.h:590 [inline]
kzalloc include/linux/slab.h:711 [inline]
cgroup1_root_to_use kernel/cgroup/cgroup-v1.c:1217 [inline]
cgroup1_get_tree+0x52e/0x8c0 kernel/cgroup/cgroup-v1.c:1244
vfs_get_tree+0x8c/0x2a0 fs/super.c:1784
do_new_mount+0x2be/0xb40 fs/namespace.c:3352
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
page last free pid 4924 tgid 4924 stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1140 [inline]
free_unref_page_prepare+0x959/0xa80 mm/page_alloc.c:2346
free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486
discard_slab mm/slub.c:2453 [inline]
__put_partials+0xeb/0x130 mm/slub.c:2922
put_cpu_partial+0x17b/0x250 mm/slub.c:2997
__slab_free+0x2fe/0x410 mm/slub.c:4166
qlink_free mm/kasan/quarantine.c:160 [inline]
qlist_free_all+0x6d/0xd0 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:324
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slub.c:3813 [inline]
slab_alloc_node mm/slub.c:3860 [inline]
__do_kmalloc_node mm/slub.c:3980 [inline]
__kmalloc+0x1dd/0x490 mm/slub.c:3994
kmalloc include/linux/slab.h:594 [inline]
tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x2b7/0x730 security/tomoyo/file.c:822
security_inode_getattr+0xd3/0x120 security/security.c:2237
vfs_getattr+0x46/0x430 fs/stat.c:173
vfs_fstat fs/stat.c:198 [inline]
vfs_fstatat+0xd6/0x190 fs/stat.c:300
__do_sys_newfstatat fs/stat.c:468 [inline]
__se_sys_newfstatat fs/stat.c:462 [inline]
__x64_sys_newfstatat+0x117/0x190 fs/stat.c:462
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83

Memory state around the buggy address:
ffff88801e12d600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801e12d680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801e12d700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801e12d780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801e12d800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

---
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Next message: Jason Gunthorpe: "[GIT PULL] Please pull IOMMUFD subsystem changes"
Previous message: Krzysztof Kozlowski: "Re: [PATCH v1 1/2] dt-bindings: arm: nuvoton: add Facebook Yosemite 4 board"
Next in thread: syzbot: "Re: [syzbot] [f2fs?] KASAN: slab-use-after-free Read in kill_f2fs_super"
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