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

From: syzbot
Date: Tue Jan 31 2023 - 08:48:57 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 7c46948a6e9c Merge tag 'fs.fuse.acl.v6.2-rc6' of git://git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12c1d8ed480000
kernel config: https://syzkaller.appspot.com/x/.config?x=c8d5c2ee6c2bd4b8
dashboard link: https://syzkaller.appspot.com/bug?extid=552d3bff86d241487b03
compiler: Debian clang version 13.0.1-6~deb11u1, GNU ld (GNU Binutils for Debian) 2.35.2

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cc51645b6401/disk-7c46948a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/be036b5604a3/vmlinux-7c46948a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/274f5abf2c8f/bzImage-7c46948a.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+552d3bff86d241487b03@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:72 [inline]
BUG: KASAN: use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
BUG: KASAN: use-after-free in queued_write_trylock include/asm-generic/qrwlock.h:67 [inline]
BUG: KASAN: use-after-free in do_raw_write_trylock+0x6e/0x1f0 kernel/locking/spinlock_debug.c:216
Read of size 4 at addr ffff8880276cd510 by task syz-executor.1/5105

CPU: 0 PID: 5105 Comm: syz-executor.1 Not tainted 6.2.0-rc5-syzkaller-00047-g7c46948a6e9c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106
print_address_description+0x74/0x340 mm/kasan/report.c:306
print_report+0x107/0x1f0 mm/kasan/report.c:417
kasan_report+0xcd/0x100 mm/kasan/report.c:517
kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189
instrument_atomic_read include/linux/instrumented.h:72 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
queued_write_trylock include/asm-generic/qrwlock.h:67 [inline]
do_raw_write_trylock+0x6e/0x1f0 kernel/locking/spinlock_debug.c:216
__raw_write_trylock include/linux/rwlock_api_smp.h:132 [inline]
_raw_write_trylock+0x1c/0x70 kernel/locking/spinlock.c:292
__shrink_extent_tree+0x85d/0xc50 fs/f2fs/extent_cache.c:1015
f2fs_leave_shrinker+0x80/0x250 fs/f2fs/shrinker.c:142
f2fs_put_super+0x59b/0xc20 fs/f2fs/super.c:1597
generic_shutdown_super+0x130/0x310 fs/super.c:492
kill_block_super+0x79/0xd0 fs/super.c:1386
kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4640
deactivate_locked_super+0xa7/0xf0 fs/super.c:332
cleanup_mnt+0x494/0x520 fs/namespace.c:1291
task_work_run+0x243/0x300 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:171
exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:203
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:296
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f779e88d537
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 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:00007fff5ea91f98 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f779e88d537
RDX: 00007fff5ea9206a RSI: 000000000000000a RDI: 00007fff5ea92060
RBP: 00007fff5ea92060 R08: 00000000ffffffff R09: 00007fff5ea91e30
R10: 0000555555e448b3 R11: 0000000000000246 R12: 00007f779e8e6b24
R13: 00007fff5ea93120 R14: 0000555555e44810 R15: 00007fff5ea93160
</TASK>

Allocated by task 9209:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x3d/0x60 mm/kasan/common.c:52
__kasan_slab_alloc+0x65/0x70 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+0x1b3/0x350 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+0x19b/0x420 fs/f2fs/extent_cache.c:423
f2fs_init_extent_tree+0x20c/0x450 fs/f2fs/extent_cache.c:533
f2fs_new_inode+0xd89/0x1060 fs/f2fs/namei.c:312
__f2fs_tmpfile+0xa5/0x380 fs/f2fs/namei.c:852
f2fs_ioc_start_atomic_write+0x3ec/0x970 fs/f2fs/file.c:2098
__f2fs_ioctl+0x137d/0xb540
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
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 9242:
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:518
____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:1781 [inline]
slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807
slab_free mm/slub.c:3787 [inline]
kmem_cache_free+0x94/0x1d0 mm/slub.c:3809
__destroy_extent_tree+0x6fa/0x880 fs/f2fs/extent_cache.c:1193
f2fs_destroy_extent_tree+0x13/0x20 fs/f2fs/extent_cache.c:1204
f2fs_evict_inode+0x324/0x1310 fs/f2fs/inode.c:789
evict+0x2a4/0x620 fs/inode.c:664
f2fs_abort_atomic_write+0xc7/0x410 fs/f2fs/segment.c:196
f2fs_ioc_abort_atomic_write fs/f2fs/file.c:2182 [inline]
__f2fs_ioctl+0x3294/0xb540 fs/f2fs/file.c:4156
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
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 ffff8880276cd4e0
which belongs to the cache f2fs_extent_tree of size 144
The buggy address is located 48 bytes inside of
144-byte region [ffff8880276cd4e0, ffff8880276cd570)

The buggy address belongs to the physical page:
page:ffffea00009db340 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880276cd820 pfn:0x276cd
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffff8880193cab40 dead000000000122 0000000000000000
raw: ffff8880276cd820 000000008013000b 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 0x112c50(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 6721, tgid 6674 (syz-executor.5), ts 321161536352, free_ts 299722486648
prep_new_page mm/page_alloc.c:2531 [inline]
get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283
__alloc_pages+0x259/0x560 mm/page_alloc.c:5549
alloc_slab_page+0xbd/0x190 mm/slub.c:1851
allocate_slab+0x5e/0x3c0 mm/slub.c:1998
new_slab mm/slub.c:2051 [inline]
___slab_alloc+0x782/0xe20 mm/slub.c:3193
__slab_alloc mm/slub.c:3292 [inline]
__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+0x268/0x350 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+0x19b/0x420 fs/f2fs/extent_cache.c:423
f2fs_init_extent_tree+0x20c/0x450 fs/f2fs/extent_cache.c:533
f2fs_new_inode+0xd89/0x1060 fs/f2fs/namei.c:312
__f2fs_tmpfile+0xa5/0x380 fs/f2fs/namei.c:852
f2fs_ioc_start_atomic_write+0x3ec/0x970 fs/f2fs/file.c:2098
__f2fs_ioctl+0x137d/0xb540
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
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:1446 [inline]
free_pcp_prepare+0x751/0x780 mm/page_alloc.c:1496
free_unref_page_prepare mm/page_alloc.c:3369 [inline]
free_unref_page+0x19/0x4c0 mm/page_alloc.c:3464
qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x156/0x170 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:761 [inline]
slab_alloc_node mm/slub.c:3452 [inline]
__kmem_cache_alloc_node+0x1e0/0x340 mm/slub.c:3491
__do_kmalloc_node mm/slab_common.c:967 [inline]
__kmalloc+0x9e/0x190 mm/slab_common.c:981
kmalloc include/linux/slab.h:584 [inline]
kzalloc include/linux/slab.h:720 [inline]
tomoyo_encode2 security/tomoyo/realpath.c:45 [inline]
tomoyo_encode+0x26f/0x540 security/tomoyo/realpath.c:80
tomoyo_path_perm+0x344/0x670 security/tomoyo/file.c:831
tomoyo_path_symlink+0xda/0x110 security/tomoyo/tomoyo.c:211
security_path_symlink+0xd6/0x160 security/security.c:1212
do_symlinkat+0x11b/0x5f0 fs/namei.c:4425
__do_sys_symlinkat fs/namei.c:4447 [inline]
__se_sys_symlinkat fs/namei.c:4444 [inline]
__x64_sys_symlinkat+0x95/0xa0 fs/namei.c:4444
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

Memory state around the buggy address:
ffff8880276cd400: fc fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880276cd480: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb
>ffff8880276cd500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
^
ffff8880276cd580: fc fc fc fc fc fc fb fb fb fb fb fb fb fb fb fb
ffff8880276cd600: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================

---
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Next message: David Hildenbrand: "Re: [GIT PULL] iov_iter: Improve page extraction (pin or just list)"
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