[syzbot] KASAN: use-after-free Read in reiserfs_find_actor

From: syzbot
Date: Mon Nov 28 2022 - 05:21:49 EST

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Hello,

syzbot found the following issue on:

HEAD commit: faf68e3523c2 Merge tag 'kbuild-fixes-v6.1-4' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13a257c5880000
kernel config: https://syzkaller.appspot.com/x/.config?x=8d01b6e3197974dd
dashboard link: https://syzkaller.appspot.com/bug?extid=e80d43036932e96e90bd
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, 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/3bfa6577f378/disk-faf68e35.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7bf0af58cde3/vmlinux-faf68e35.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3e15d7d640b0/bzImage-faf68e35.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e80d43036932e96e90bd@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: use-after-free in reiserfs_find_actor+0xdf/0x100 fs/reiserfs/inode.c:1625
Read of size 4 at addr ffff88803459e8f0 by task syz-executor.1/6406

CPU: 0 PID: 6406 Comm: syz-executor.1 Not tainted 6.1.0-rc6-syzkaller-00315-gfaf68e3523c2 #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+0x1b1/0x28e lib/dump_stack.c:106
print_address_description+0x74/0x340 mm/kasan/report.c:284
print_report+0x107/0x1f0 mm/kasan/report.c:395
kasan_report+0xcd/0x100 mm/kasan/report.c:495
reiserfs_find_actor+0xdf/0x100 fs/reiserfs/inode.c:1625
find_inode+0x1ac/0x4c0 fs/inode.c:915
inode_insert5+0xf3/0x500 fs/inode.c:1170
insert_inode_locked4+0x5a/0x90 fs/inode.c:1680
reiserfs_new_inode+0x4e5/0x1cd0 fs/reiserfs/inode.c:1960
reiserfs_create+0x39a/0x660 fs/reiserfs/namei.c:668
lookup_open fs/namei.c:3413 [inline]
open_last_lookups fs/namei.c:3481 [inline]
path_openat+0x12d0/0x2df0 fs/namei.c:3711
do_filp_open+0x264/0x4f0 fs/namei.c:3741
do_sys_openat2+0x124/0x4e0 fs/open.c:1310
do_sys_open fs/open.c:1326 [inline]
__do_sys_openat fs/open.c:1342 [inline]
__se_sys_openat fs/open.c:1337 [inline]
__x64_sys_openat+0x243/0x290 fs/open.c:1337
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
RIP: 0033:0x7f6c04c8c0d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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:00007f6c059de168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f6c04dac050 RCX: 00007f6c04c8c0d9
RDX: 000000000000275a RSI: 0000000020000280 RDI: ffffffffffffff9c
RBP: 00007f6c04ce7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd8cc8768f R14: 00007f6c059de300 R15: 0000000000022000
</TASK>

Allocated by task 30009:
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:737 [inline]
slab_alloc_node mm/slub.c:3398 [inline]
slab_alloc mm/slub.c:3406 [inline]
__kmem_cache_alloc_lru mm/slub.c:3413 [inline]
kmem_cache_alloc_lru+0x180/0x2e0 mm/slub.c:3429
alloc_inode_sb include/linux/fs.h:3117 [inline]
f2fs_alloc_inode+0x14d/0x520 fs/f2fs/super.c:1366
alloc_inode fs/inode.c:259 [inline]
iget_locked+0x191/0x830 fs/inode.c:1286
f2fs_iget+0x51/0x4bb0 fs/f2fs/inode.c:505
f2fs_fill_super+0x52c4/0x6c40 fs/f2fs/super.c:4333
mount_bdev+0x26c/0x3a0 fs/super.c:1401
legacy_get_tree+0xea/0x180 fs/fs_context.c:610
vfs_get_tree+0x88/0x270 fs/super.c:1531
do_new_mount+0x289/0xad0 fs/namespace.c:3040
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
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

Last potentially related work creation:
kasan_save_stack+0x2b/0x50 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:481
call_rcu+0x163/0x9c0 kernel/rcu/tree.c:2798
f2fs_put_super+0x5c7/0xb60 fs/f2fs/super.c:1596
generic_shutdown_super+0x130/0x310 fs/super.c:492
kill_block_super+0x79/0xd0 fs/super.c:1428
kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4612
deactivate_locked_super+0xa7/0xf0 fs/super.c:332
cleanup_mnt+0x494/0x520 fs/namespace.c:1186
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

Second to last potentially related work creation:
kasan_save_stack+0x2b/0x50 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:481
call_rcu+0x163/0x9c0 kernel/rcu/tree.c:2798
f2fs_put_super+0x606/0xb60 fs/f2fs/super.c:1599
generic_shutdown_super+0x130/0x310 fs/super.c:492
kill_block_super+0x79/0xd0 fs/super.c:1428
kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4612
deactivate_locked_super+0xa7/0xf0 fs/super.c:332
cleanup_mnt+0x494/0x520 fs/namespace.c:1186
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

The buggy address belongs to the object at ffff88803459e1a0
which belongs to the cache f2fs_inode_cache of size 2144
The buggy address is located 1872 bytes inside of
2144-byte region [ffff88803459e1a0, ffff88803459ea00)

The buggy address belongs to the physical page:
page:ffffea0000d16600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888034599aa0 pfn:0x34598
head:ffffea0000d16600 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff8880222cf501
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000d35a00 dead000000000002 ffff88801cb74c80
raw: ffff888034599aa0 00000000800e0005 00000001ffffffff ffff8880222cf501
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 27886, tgid 27885 (syz-executor.1), ts 1184915928737, free_ts 1175787154919
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4291
__alloc_pages+0x259/0x560 mm/page_alloc.c:5558
alloc_slab_page+0x70/0xf0 mm/slub.c:1794
allocate_slab+0x5e/0x4b0 mm/slub.c:1939
new_slab mm/slub.c:1992 [inline]
___slab_alloc+0x782/0xe20 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
slab_alloc mm/slub.c:3406 [inline]
__kmem_cache_alloc_lru mm/slub.c:3413 [inline]
kmem_cache_alloc_lru+0x233/0x2e0 mm/slub.c:3429
alloc_inode_sb include/linux/fs.h:3117 [inline]
f2fs_alloc_inode+0x14d/0x520 fs/f2fs/super.c:1366
alloc_inode fs/inode.c:259 [inline]
iget_locked+0x191/0x830 fs/inode.c:1286
f2fs_iget+0x51/0x4bb0 fs/f2fs/inode.c:505
f2fs_fill_super+0x5382/0x6c40 fs/f2fs/super.c:4341
mount_bdev+0x26c/0x3a0 fs/super.c:1401
legacy_get_tree+0xea/0x180 fs/fs_context.c:610
vfs_get_tree+0x88/0x270 fs/super.c:1531
do_new_mount+0x289/0xad0 fs/namespace.c:3040
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/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:1459 [inline]
free_pcp_prepare+0x80c/0x8f0 mm/page_alloc.c:1509
free_unref_page_prepare mm/page_alloc.c:3387 [inline]
free_unref_page+0x7d/0x5f0 mm/page_alloc.c:3483
free_slab mm/slub.c:2031 [inline]
discard_slab mm/slub.c:2037 [inline]
__unfreeze_partials+0x1ab/0x200 mm/slub.c:2586
put_cpu_partial+0x106/0x170 mm/slub.c:2662
qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x169/0x180 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:737 [inline]
slab_alloc_node mm/slub.c:3398 [inline]
__kmem_cache_alloc_node+0x1d7/0x310 mm/slub.c:3437
__do_kmalloc_node mm/slab_common.c:954 [inline]
__kmalloc+0x9e/0x1a0 mm/slab_common.c:968
kmalloc include/linux/slab.h:558 [inline]
tomoyo_realpath_from_path+0xcd/0x5f0 security/tomoyo/realpath.c:251
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_number_perm+0x1d3/0x760 security/tomoyo/file.c:723
security_file_ioctl+0x55/0xb0 security/security.c:1554
__do_sys_ioctl fs/ioctl.c:864 [inline]
__se_sys_ioctl+0x48/0x170 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

Memory state around the buggy address:
ffff88803459e780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88803459e800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88803459e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88803459e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88803459e980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

---
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