Created attachment 300818 [details]
case.c

I have encountered a bug in F2FS file system in kernel v5.17.

I have uploaded the system call sequence as case.c, and a fuzzed image can be found in google net disk (https://drive.google.com/file/d/1PKx2vYljtEEn88AdYHZElKfahOjtzfh2/view?usp=sharing).

The kernel should enable CONFIG_KASAN=y and CONFIG_KASAN_INLINE=y. You can reproduce the bug by running the following commands:

gcc -o case case.c
losetup /dev/loop0 case.img
mount -o "background_gc=on,disable_roll_forward,nodiscard,noacl,flush_merge,nobarrier,fastboot,extent_cache,checkpoint=disable,usrquota,test_dummy_encryption" -t f2fs /dev/loop0 /root/mnt
./case

The kernel message is shown below:

6,828,84762553,-;loop0: detected capacity change from 0 to 131072
6,829,84800241,-;F2FS-fs (loop0): Mismatch start address, segment0(512) cp_blkaddr(4060086784)
3,830,84800254,-;F2FS-fs (loop0): Can't find valid F2FS filesystem in 2th superblock
4,831,84800328,-;F2FS-fs (loop0): Test dummy encryption mount option ignored
5,832,84804081,-;F2FS-fs (loop0): Disable nat_bits due to incorrect cp_ver (17468725613732348634, 17765647070955881174)
4,833,84831908,-;F2FS-fs (loop0): Start checkpoint disabled!
6,834,85341039,-;F2FS-fs (loop0): Try to recover 2th superblock, ret: 0
5,835,85341048,-;F2FS-fs (loop0): Mounted with checkpoint version = 7548c2db
4,836,85400108,-;------------[ cut here ]------------
2,837,85400113,-;kernel BUG at fs/inode.c:611!
4,838,85400126,-;invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
4,839,85400132,-;CPU: 3 PID: 1067 Comm: case Not tainted 5.17.0 #2
4,840,85400138,-;Hardware name: Dell Inc. OptiPlex 9020/03CPWF, BIOS A14 09/14/2015
4,841,85400142,-;RIP: 0010:clear_inode+0xdf/0x120
4,842,85400150,-;Code: fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 75 42 48 8b 83 18 01 00 00 48 39 c5 75 16 48 c7 83 98 00 00 00 60 00 00 00 5b 5d c3 <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b e8 22 61 f8 ff e9 43 ff ff ff e8 18
4,843,85400158,-;RSP: 0018:ffff8881147d7c48 EFLAGS: 00010002
4,844,85400164,-;RAX: dffffc0000000000 RBX: ffff88814bbd1360 RCX: ffffffff9f4d4923
4,845,85400168,-;RDX: 1ffff1102977a2a9 RSI: 0000000000000004 RDI: ffff88814bbd1548
4,846,85400172,-;RBP: ffff88814bbd14d0 R08: 0000000000000001 R09: ffffed10228faf7f
4,847,85400176,-;R10: 0000000000000003 R11: ffffed10228faf7e R12: ffff88814bbd13f8
4,848,85400179,-;R13: ffff88814bbd1388 R14: ffffffff9fbc2fc0 R15: ffff888107473508
4,849,85400184,-;FS:  00007f32d4133540(0000) GS:ffff8881d56c0000(0000) knlGS:0000000000000000
4,850,85400189,-;CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
4,851,85400192,-;CR2: 00007ffd60dc7f5c CR3: 000000012b5fc002 CR4: 00000000001706e0
4,852,85400196,-;Call Trace:
4,853,85400199,-; <TASK>
4,854,85400202,-; evict+0x282/0x4e0
4,855,85400206,-; __dentry_kill+0x2b2/0x4d0
4,856,85400211,-; dput+0x2dd/0x720
4,857,85400215,-; do_renameat2+0x596/0x970
4,858,85400220,-; ? __x64_sys_link+0x90/0x90
4,859,85400224,-; ? _raw_spin_lock_irqsave+0x88/0xe0
4,860,85400230,-; ? kmem_cache_alloc+0xc4/0x220
4,861,85400234,-; ? _raw_spin_unlock_irqrestore+0x3d/0x70
4,862,85400239,-; ? kasan_unpoison+0x23/0x50
4,863,85400244,-; ? getname_flags+0xf8/0x4e0
4,864,85400250,-; __x64_sys_rename+0x78/0x90
4,865,85400254,-; do_syscall_64+0x3b/0x90
4,866,85400259,-; entry_SYSCALL_64_after_hwframe+0x44/0xae
4,867,85400264,-;RIP: 0033:0x7f32d405876d
4,868,85400267,-;Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 8b 0d f3 36 0d 00 f7 d8 64 89 01 48
4,869,85400274,-;RSP: 002b:00007ffd60dc7f48 EFLAGS: 00000286 ORIG_RAX: 0000000000000052
4,870,85400280,-;RAX: ffffffffffffffda RBX: 0000557225962190 RCX: 00007f32d405876d
4,871,85400284,-;RDX: ffffffffffffff80 RSI: 00007ffd60dc807a RDI: 00007ffd60dc802c
4,872,85400288,-;RBP: 00007ffd611c8340 R08: 00007ffd611c8438 R09: 00007ffd611c8438
4,873,85400292,-;R10: 00007ffd611c8438 R11: 0000000000000286 R12: 00005572259610a0
4,874,85400295,-;R13: 00007ffd611c8430 R14: 0000000000000000 R15: 0000000000000000
4,875,85400300,-; </TASK>
4,876,85400302,-;Modules linked in: x86_pkg_temp_thermal efivarfs
4,877,85400310,-;---[ end trace 0000000000000000 ]---