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

From: syzbot
Date: Fri Jan 12 2024 - 13:14:39 EST

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syzbot has found a reproducer for the following issue on:

HEAD commit: 70d201a40823 Merge tag 'f2fs-for-6.8-rc1' of git://git.ker..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13973ca5e80000
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
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16b910ede80000

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
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/47520ebdcfe6/mount_0.gz
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/bc946d522410/mount_1.gz

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 ffff88801c6bd77c by task syz-executor.0/5218

CPU: 1 PID: 5218 Comm: syz-executor.0 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: 0033:0x7ff92ca7e4aa
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:00007fffd484f9b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fffd484fa40 RCX: 00007ff92ca7e4aa
RDX: 0000000020000040 RSI: 0000000020000080 RDI: 00007fffd484fa00
RBP: 0000000020000040 R08: 00007fffd484fa40 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000080
R13: 00007fffd484fa00 R14: 00000000000054f9 R15: 00000000200004c0
</TASK>

Allocated by task 5218:
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 5218:
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 ffff88801c6bc000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 6012 bytes inside of
freed 8192-byte region [ffff88801c6bc000, ffff88801c6be000)

The buggy address belongs to the physical page:
page:ffffea000071ae00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1c6b8
head:ffffea000071ae00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888012c42280 dead000000000122 0000000000000000
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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5217, tgid 5217 (syz-executor.2), ts 94314184798, free_ts 94276562119
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]
__do_kmalloc_node mm/slub.c:3980 [inline]
__kmalloc_node+0x2d2/0x4e0 mm/slub.c:3988
kmalloc_node include/linux/slab.h:610 [inline]
kvmalloc_node+0x72/0x180 mm/util.c:617
build_sit_info fs/f2fs/segment.c:4402 [inline]
f2fs_build_segment_manager+0x1036/0x3270 fs/f2fs/segment.c:5252
f2fs_fill_super+0x5792/0x8170 fs/f2fs/super.c:4609
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
page last free pid 4503 tgid 4503 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]
kmem_cache_alloc+0x16f/0x340 mm/slub.c:3867
getname_flags+0xbc/0x4f0 fs/namei.c:140
user_path_at_empty+0x2c/0x60 fs/namei.c:2909
do_readlinkat+0x118/0x3b0 fs/stat.c:499
__do_sys_readlink fs/stat.c:532 [inline]
__se_sys_readlink fs/stat.c:529 [inline]
__x64_sys_readlink+0x7f/0x90 fs/stat.c:529
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

Memory state around the buggy address:
ffff88801c6bd600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801c6bd680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801c6bd700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801c6bd780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801c6bd800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

---
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Next message: Yonghong Song: "Re: [PATCH v3 2/2] selftests/bpf: Add tests for alu on PTR_TO_FLOW_KEYS"
Previous message: Sidhartha Kumar: "[PATCH v2] fs/hugetlbfs/inode.c: mm/memory-failure.c: fix hugetlbfs hwpoison handling"
In reply to: syzbot: "[syzbot] [f2fs?] KASAN: slab-use-after-free Read in kill_f2fs_super"
Next in thread: Hillf Danton: "Re: [syzbot] [f2fs?] KASAN: slab-use-after-free Read in kill_f2fs_super"
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