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

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 1b929c02afd3 Linux 6.2-rc1
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14467b44480000
kernel config: https://syzkaller.appspot.com/x/.config?x=2651619a26b4d687
dashboard link: https://syzkaller.appspot.com/bug?extid=823000d23b3400619f7c
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12597238480000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11ae9d7f880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d562ace1a56c/disk-1b929c02.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/39f000fe6b9e/vmlinux-1b929c02.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1c67e48de5a0/bzImage-1b929c02.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/7397ce24df87/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+823000...@syzkaller.appspotmail.com

F2FS-fs (loop0): Found nat_bits in checkpoint
F2FS-fs (loop0): Try to recover 1th superblock, ret: 0
F2FS-fs (loop0): Mounted with checkpoint version = 753bd00b
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x3ee7/0x56d0 kernel/locking/lockdep.c:4925
Read of size 8 at addr ffff8880728e9048 by task syz-executor277/5099

CPU: 0 PID: 5099 Comm: syz-executor277 Not tainted 6.2.0-rc1-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+0xd1/0x138 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:306 [inline]
print_report+0x15e/0x45d mm/kasan/report.c:417
kasan_report+0xbf/0x1f0 mm/kasan/report.c:517
__lock_acquire+0x3ee7/0x56d0 kernel/locking/lockdep.c:4925
lock_acquire kernel/locking/lockdep.c:5668 [inline]
lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
__raw_write_lock include/linux/rwlock_api_smp.h:209 [inline]
_raw_write_lock+0x2e/0x40 kernel/locking/spinlock.c:300
__update_extent_tree_range+0x9c2/0x1740 fs/f2fs/extent_cache.c:692
__update_extent_cache fs/f2fs/extent_cache.c:960 [inline]
f2fs_update_read_extent_cache+0x287/0x360 fs/f2fs/extent_cache.c:1050
f2fs_outplace_write_data+0x1eb/0x280 fs/f2fs/segment.c:3454
f2fs_do_write_data_page+0x9c7/0x1e20 fs/f2fs/data.c:2745
f2fs_write_single_data_page+0x13f0/0x1920 fs/f2fs/data.c:2863
f2fs_write_cache_pages+0xaa8/0x2010 fs/f2fs/data.c:3115
__f2fs_write_data_pages fs/f2fs/data.c:3265 [inline]
f2fs_write_data_pages+0x4c7/0x1230 fs/f2fs/data.c:3292
do_writepages+0x1af/0x690 mm/page-writeback.c:2581
filemap_fdatawrite_wbc mm/filemap.c:388 [inline]
filemap_fdatawrite_wbc+0x147/0x1b0 mm/filemap.c:378
__filemap_fdatawrite_range+0xb8/0xf0 mm/filemap.c:421
file_write_and_wait_range+0xce/0x140 mm/filemap.c:777
f2fs_do_sync_file+0x3a4/0x2a20 fs/f2fs/file.c:275
f2fs_sync_file+0x13a/0x190 fs/f2fs/file.c:393
vfs_fsync_range+0x13e/0x230 fs/sync.c:188
generic_write_sync include/linux/fs.h:2882 [inline]
f2fs_file_write_iter+0x1840/0x31c0 fs/f2fs/file.c:4721
call_write_iter include/linux/fs.h:2186 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x9ed/0xdd0 fs/read_write.c:584
ksys_write+0x12b/0x250 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7faeb95879a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 31 18 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007faeb9524208 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007faeb9614708 RCX: 00007faeb95879a9
RDX: 000000000000fd14 RSI: 0000000020000080 RDI: 0000000000000005
RBP: 00007faeb9614700 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007faeb961470c
R13: 00007ffe6bd47dff R14: 00007faeb9524300 R15: 0000000000022000
</TASK>

Allocated by task 5105:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
__kasan_slab_alloc+0x82/0x90 mm/kasan/common.c:325
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slab.h:761 [inline]
slab_alloc_node mm/slub.c:3452 [inline]
slab_alloc mm/slub.c:3460 [inline]
__kmem_cache_alloc_lru mm/slub.c:3467 [inline]
kmem_cache_alloc+0x1e4/0x430 mm/slub.c:3476
f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2796 [inline]
f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2806 [inline]
__grab_extent_tree+0x278/0x5a0 fs/f2fs/extent_cache.c:423
f2fs_init_extent_tree+0x57/0x80 fs/f2fs/extent_cache.c:533
f2fs_new_inode+0xdfa/0x2760 fs/f2fs/namei.c:312
__f2fs_tmpfile+0xba/0x440 fs/f2fs/namei.c:852
f2fs_ioc_start_atomic_write+0x409/0x1260 fs/f2fs/file.c:2098
__f2fs_ioctl+0x3f2a/0xaaf0 fs/f2fs/file.c:4150
f2fs_ioctl+0x18e/0x220 fs/f2fs/file.c:4242
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 5105:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1781 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
slab_free mm/slub.c:3787 [inline]
kmem_cache_free+0xee/0x5c0 mm/slub.c:3809
__destroy_extent_tree+0x1f8/0x7f0 fs/f2fs/extent_cache.c:1191
f2fs_destroy_extent_tree+0x17/0x30 fs/f2fs/extent_cache.c:1202
f2fs_evict_inode+0x38b/0x1df0 fs/f2fs/inode.c:789
evict+0x2ed/0x6b0 fs/inode.c:664
iput_final fs/inode.c:1747 [inline]
iput.part.0+0x59b/0x880 fs/inode.c:1773
iput+0x5c/0x80 fs/inode.c:1763
f2fs_abort_atomic_write+0xea/0x4f0 fs/f2fs/segment.c:196
f2fs_file_flush+0x79/0xa0 fs/f2fs/file.c:1884
filp_close+0xb8/0x160 fs/open.c:1420
__range_close fs/file.c:714 [inline]
__close_range+0x454/0x980 fs/file.c:776
__do_sys_close_range fs/open.c:1465 [inline]
__se_sys_close_range fs/open.c:1462 [inline]
__x64_sys_close_range+0x73/0xb0 fs/open.c:1462
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff8880728e9000
which belongs to the cache f2fs_extent_tree of size 144
The buggy address is located 72 bytes inside of
144-byte region [ffff8880728e9000, ffff8880728e9090)

The buggy address belongs to the physical page:
page:ffffea0001ca3a40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x728e9
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffff88801be69a00 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080130013 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x12c50(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_RECLAIMABLE), pid 5105, tgid 5098 (syz-executor277), ts 675484271130, free_ts 11304318576
prep_new_page mm/page_alloc.c:2531 [inline]
get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283
__alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5549
alloc_pages+0x1aa/0x270 mm/mempolicy.c:2286
alloc_slab_page mm/slub.c:1851 [inline]
allocate_slab+0x25f/0x350 mm/slub.c:1998
new_slab mm/slub.c:2051 [inline]
___slab_alloc+0xa91/0x1400 mm/slub.c:3193
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292
__slab_alloc_node mm/slub.c:3345 [inline]
slab_alloc_node mm/slub.c:3442 [inline]
slab_alloc mm/slub.c:3460 [inline]
__kmem_cache_alloc_lru mm/slub.c:3467 [inline]
kmem_cache_alloc+0x379/0x430 mm/slub.c:3476
f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2796 [inline]
f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2806 [inline]
__grab_extent_tree+0x278/0x5a0 fs/f2fs/extent_cache.c:423
f2fs_init_extent_tree+0x57/0x80 fs/f2fs/extent_cache.c:533
f2fs_new_inode+0xdfa/0x2760 fs/f2fs/namei.c:312
__f2fs_tmpfile+0xba/0x440 fs/f2fs/namei.c:852
f2fs_ioc_start_atomic_write+0x409/0x1260 fs/f2fs/file.c:2098
__f2fs_ioctl+0x3f2a/0xaaf0 fs/f2fs/file.c:4150
f2fs_ioctl+0x18e/0x220 fs/f2fs/file.c:4242
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1446 [inline]
free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1496
free_unref_page_prepare mm/page_alloc.c:3369 [inline]
free_unref_page+0x1d/0x490 mm/page_alloc.c:3464
free_contig_range+0xb5/0x180 mm/page_alloc.c:9485
destroy_args+0xa8/0x64c mm/debug_vm_pgtable.c:998
debug_vm_pgtable+0x28de/0x296f mm/debug_vm_pgtable.c:1318
do_one_initcall+0x141/0x790 init/main.c:1306
do_initcall_level init/main.c:1379 [inline]
do_initcalls init/main.c:1395 [inline]
do_basic_setup init/main.c:1414 [inline]
kernel_init_freeable+0x6f9/0x782 init/main.c:1634
kernel_init+0x1e/0x1d0 init/main.c:1522
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Memory state around the buggy address:
ffff8880728e8f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880728e8f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880728e9000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880728e9080: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880728e9100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


---
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[syzbot]

syzbot has bisected this issue to:

commit 3db1de0e582c358dd013f3703cd55b5fe4076436
Author: Daeho Jeong <daeho...@google.com>
Date: Thu Apr 28 18:18:09 2022 +0000

f2fs: change the current atomic write way

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15c77d38480000
start commit: 1b929c02afd3 Linux 6.2-rc1
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=17c77d38480000
console output: https://syzkaller.appspot.com/x/log.txt?x=13c77d38480000

kernel config: https://syzkaller.appspot.com/x/.config?x=2651619a26b4d687
dashboard link: https://syzkaller.appspot.com/bug?extid=823000d23b3400619f7c

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12597238480000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11ae9d7f880000

Reported-by: syzbot+823000...@syzkaller.appspotmail.com
Fixes: 3db1de0e582c ("f2fs: change the current atomic write way")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection