[syzbot] [xfs?] KASAN: use-after-free Read in xfs_inode_item_push

From: syzbot
Date: Fri Feb 10 2023 - 01:33:48 EST

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Hello,

syzbot found the following issue on:

HEAD commit: d2d11f342b17 Merge branch 'fixes' of git://git.kernel.org/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1529cd73480000
kernel config: https://syzkaller.appspot.com/x/.config?x=6bb1911ff9919df0
dashboard link: https://syzkaller.appspot.com/bug?extid=f0da51f81ea0b040c803
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, 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/6be923b8a63a/disk-d2d11f34.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9a426c0bf1d8/vmlinux-d2d11f34.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3c6af145650b/bzImage-d2d11f34.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f0da51f81ea0b040c803@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: use-after-free in xfs_inode_item_push+0x338/0x350 fs/xfs/xfs_inode_item.c:594
Read of size 8 at addr ffff88804bb907e0 by task xfsaild/loop3/17189

CPU: 0 PID: 17189 Comm: xfsaild/loop3 Not tainted 6.2.0-rc7-syzkaller-00002-gd2d11f342b17 #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+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
xfs_inode_item_push+0x338/0x350 fs/xfs/xfs_inode_item.c:594
xfsaild_push_item fs/xfs/xfs_trans_ail.c:414 [inline]
xfsaild_push fs/xfs/xfs_trans_ail.c:486 [inline]
xfsaild+0xd0f/0x27f0 fs/xfs/xfs_trans_ail.c:671
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>

Allocated by task 17140:
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
kmem_cache_zalloc include/linux/slab.h:710 [inline]
xfs_inode_item_init+0x24/0xc0 fs/xfs/xfs_inode_item.c:687
xfs_trans_ijoin+0xb3/0x100 fs/xfs/libxfs/xfs_trans_inode.c:36
xfs_init_new_inode+0x628/0x1910 fs/xfs/xfs_inode.c:902
xfs_create+0x77a/0x1250 fs/xfs/xfs_inode.c:1023
xfs_generic_create+0x5ee/0x790 fs/xfs/xfs_iops.c:199
lookup_open.isra.0+0xee7/0x1270 fs/namei.c:3413
open_last_lookups fs/namei.c:3481 [inline]
path_openat+0x975/0x2a50 fs/namei.c:3711
do_filp_open+0x1ba/0x410 fs/namei.c:3741
do_sys_openat2+0x16d/0x4c0 fs/open.c:1310
do_sys_open fs/open.c:1326 [inline]
__do_sys_open fs/open.c:1334 [inline]
__se_sys_open fs/open.c:1330 [inline]
__x64_sys_open+0x11d/0x1c0 fs/open.c:1330
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 5137:
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
xfs_inode_free_callback+0x159/0x240 fs/xfs/xfs_icache.c:145
rcu_do_batch kernel/rcu/tree.c:2246 [inline]
rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2506
__do_softirq+0x1fb/0xadc kernel/softirq.c:571

The buggy address belongs to the object at ffff88804bb907b0
which belongs to the cache xfs_ili of size 264
The buggy address is located 48 bytes inside of
264-byte region [ffff88804bb907b0, ffff88804bb908b8)

The buggy address belongs to the physical page:
page:ffffea00012ee400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88804bb90520 pfn:0x4bb90
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffff88801bf9fdc0 dead000000000122 0000000000000000
raw: ffff88804bb90520 00000000800c0006 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 12970, tgid 12969 (syz-executor.2), ts 689997984493, free_ts 627929371073
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:2287
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
kmem_cache_zalloc include/linux/slab.h:710 [inline]
xfs_inode_item_init+0x24/0xc0 fs/xfs/xfs_inode_item.c:687
xfs_trans_ijoin+0xb3/0x100 fs/xfs/libxfs/xfs_trans_inode.c:36
xfs_trans_alloc_ichange+0x156/0x590 fs/xfs/xfs_trans.c:1298
xfs_setattr_nonsize+0x18b/0xed0 fs/xfs/xfs_iops.c:709
xfs_vn_setattr+0x358/0x8d0 fs/xfs/xfs_iops.c:1024
notify_change+0xca7/0x1420 fs/attr.c:482
chown_common+0x60a/0x6f0 fs/open.c:736
do_fchownat+0x12a/0x1e0 fs/open.c:767
__do_sys_lchown fs/open.c:792 [inline]
__se_sys_lchown fs/open.c:790 [inline]
__x64_sys_lchown+0x7e/0xc0 fs/open.c:790
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
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x66/0x90 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+0x1ea/0x430 mm/slub.c:3491
__do_kmalloc_node mm/slab_common.c:967 [inline]
__kmalloc+0x4a/0xd0 mm/slab_common.c:981
kmalloc include/linux/slab.h:584 [inline]
kzalloc include/linux/slab.h:720 [inline]
tomoyo_encode2.part.0+0xe9/0x3a0 security/tomoyo/realpath.c:45
tomoyo_encode2 security/tomoyo/realpath.c:31 [inline]
tomoyo_encode+0x2c/0x50 security/tomoyo/realpath.c:80
tomoyo_path_perm+0x391/0x430 security/tomoyo/file.c:831
tomoyo_path_symlink+0x98/0xe0 security/tomoyo/tomoyo.c:211
security_path_symlink+0xe3/0x160 security/security.c:1212
do_symlinkat+0x10a/0x2c0 fs/namei.c:4425
__do_sys_symlink fs/namei.c:4452 [inline]
__se_sys_symlink fs/namei.c:4450 [inline]
__x64_sys_symlink+0x79/0x90 fs/namei.c:4450
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

Memory state around the buggy address:
ffff88804bb90680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804bb90700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
>ffff88804bb90780: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb
^
ffff88804bb90800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804bb90880: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fa
==================================================================

---
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