[syzbot] KASAN: slab-out-of-bounds Read in ext4_enable_quotas

From: syzbot
Date: Mon Sep 26 2022 - 09:24:41 EST

Next message: Greg Kroah-Hartman: "[PATCH 5.15 092/148] of: mdio: Add of_node_put() when breaking out of for_each_xx"
Previous message: Mathias Nyman: "Re: [PATCH] fix: add XHCI_SPURIOUS_SUCCESS to ASM1042 despite being a V0.96 controller"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Hello,

syzbot found the following issue on:

HEAD commit: bf682942cd26 Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12e7f318880000
kernel config: https://syzkaller.appspot.com/x/.config?x=c221af36f6d1d811
dashboard link: https://syzkaller.appspot.com/bug?extid=ea70429cd5cf47ba8937
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/a27f1315833f/disk-bf682942.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/10067330020a/vmlinux-bf682942.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ea70429cd5cf47ba8937@xxxxxxxxxxxxxxxxxxxxxxxxx

loop0: detected capacity change from 0 to 4096
==================================================================
BUG: KASAN: slab-out-of-bounds in lockdep_set_quota_inode fs/ext4/super.c:6677 [inline]
BUG: KASAN: slab-out-of-bounds in ext4_quota_enable fs/ext4/super.c:6787 [inline]
BUG: KASAN: slab-out-of-bounds in ext4_enable_quotas+0x577/0xcf0 fs/ext4/super.c:6814
Read of size 8 at addr ffff8880512c1a60 by task syz-executor.0/14097

CPU: 0 PID: 14097 Comm: syz-executor.0 Not tainted 6.0.0-rc6-syzkaller-00210-gbf682942cd26 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
print_address_description+0x65/0x4b0 mm/kasan/report.c:317
print_report+0x108/0x1f0 mm/kasan/report.c:433
kasan_report+0xc3/0xf0 mm/kasan/report.c:495
lockdep_set_quota_inode fs/ext4/super.c:6677 [inline]
ext4_quota_enable fs/ext4/super.c:6787 [inline]
ext4_enable_quotas+0x577/0xcf0 fs/ext4/super.c:6814
__ext4_fill_super+0x9305/0x9a10 fs/ext4/super.c:5363
ext4_fill_super+0x313/0x700 fs/ext4/super.c:5517
get_tree_bdev+0x400/0x620 fs/super.c:1323
vfs_get_tree+0x88/0x270 fs/super.c:1530
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
RIP: 0033:0x7f473308bb9a
Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 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:00007f4731ffdf88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f473308bb9a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f4731ffdfe0
RBP: 00007f4731ffe020 R08: 00007f4731ffe020 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f4731ffdfe0 R15: 0000000020000080
</TASK>

Allocated by task 8066:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:437 [inline]
__kasan_slab_alloc+0xa3/0xd0 mm/kasan/common.c:470
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:727 [inline]
slab_alloc_node mm/slub.c:3248 [inline]
slab_alloc mm/slub.c:3256 [inline]
__kmem_cache_alloc_lru mm/slub.c:3263 [inline]
kmem_cache_alloc_lru+0x175/0x2d0 mm/slub.c:3280
alloc_inode_sb include/linux/fs.h:3103 [inline]
f2fs_alloc_inode+0x14d/0x520 fs/f2fs/super.c:1361
alloc_inode fs/inode.c:260 [inline]
iget_locked+0x191/0x830 fs/inode.c:1287
f2fs_iget+0x52/0x4930 fs/f2fs/inode.c:489
f2fs_fill_super+0x4fd6/0x6c90 fs/f2fs/super.c:4265
mount_bdev+0x26c/0x3a0 fs/super.c:1400
legacy_get_tree+0xea/0x180 fs/fs_context.c:610
vfs_get_tree+0x88/0x270 fs/super.c:1530
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:38
__kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348
call_rcu+0x163/0x970 kernel/rcu/tree.c:2793
f2fs_fill_super+0x537b/0x6c90 fs/f2fs/super.c:4448
mount_bdev+0x26c/0x3a0 fs/super.c:1400
legacy_get_tree+0xea/0x180 fs/fs_context.c:610
vfs_get_tree+0x88/0x270 fs/super.c:1530
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

The buggy address belongs to the object at ffff8880512c11b0
which belongs to the cache f2fs_inode_cache of size 2136
The buggy address is located 88 bytes to the right of
2136-byte region [ffff8880512c11b0, ffff8880512c1a08)

The buggy address belongs to the physical page:
page:ffffea000144b000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880512c2c38 pfn:0x512c0
head:ffffea000144b000 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88807cbb6e01
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff88801bf883c0
raw: ffff8880512c2c38 00000000800e0009 00000001ffffffff ffff88807cbb6e01
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 7508, tgid 7507 (syz-executor.5), ts 142200130740, free_ts 141953283665
prep_new_page mm/page_alloc.c:2532 [inline]
get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283
__alloc_pages+0x259/0x560 mm/page_alloc.c:5515
alloc_slab_page+0x70/0xf0 mm/slub.c:1829
allocate_slab+0x5e/0x520 mm/slub.c:1974
new_slab mm/slub.c:2034 [inline]
___slab_alloc+0x3ee/0xc40 mm/slub.c:3036
__slab_alloc mm/slub.c:3123 [inline]
slab_alloc_node mm/slub.c:3214 [inline]
slab_alloc mm/slub.c:3256 [inline]
__kmem_cache_alloc_lru mm/slub.c:3263 [inline]
kmem_cache_alloc_lru+0x225/0x2d0 mm/slub.c:3280
alloc_inode_sb include/linux/fs.h:3103 [inline]
f2fs_alloc_inode+0x14d/0x520 fs/f2fs/super.c:1361
alloc_inode fs/inode.c:260 [inline]
iget_locked+0x191/0x830 fs/inode.c:1287
f2fs_iget+0x52/0x4930 fs/f2fs/inode.c:489
f2fs_fill_super+0x38c1/0x6c90 fs/f2fs/super.c:4157
mount_bdev+0x26c/0x3a0 fs/super.c:1400
legacy_get_tree+0xea/0x180 fs/fs_context.c:610
vfs_get_tree+0x88/0x270 fs/super.c:1530
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:1449 [inline]
free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499
free_unref_page_prepare mm/page_alloc.c:3380 [inline]
free_unref_page+0x7d/0x5f0 mm/page_alloc.c:3476
qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:447
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:727 [inline]
slab_alloc_node mm/slub.c:3248 [inline]
kmem_cache_alloc_node+0x1cc/0x350 mm/slub.c:3298
__alloc_skb+0xcf/0x2b0 net/core/skbuff.c:422
alloc_skb include/linux/skbuff.h:1257 [inline]
alloc_skb_with_frags+0xaf/0x810 net/core/skbuff.c:6021
sock_alloc_send_pskb+0x938/0xa70 net/core/sock.c:2665
unix_dgram_sendmsg+0x5ab/0x2010 net/unix/af_unix.c:1912
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg net/socket.c:734 [inline]
sock_write_iter+0x3d4/0x540 net/socket.c:1108
call_write_iter include/linux/fs.h:2187 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x7dc/0xc50 fs/read_write.c:578
ksys_write+0x177/0x2a0 fs/read_write.c:631
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:
ffff8880512c1900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880512c1980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880512c1a00: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8880512c1a80: fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8880512c1b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

Next message: Greg Kroah-Hartman: "[PATCH 5.15 092/148] of: mdio: Add of_node_put() when breaking out of for_each_xx"
Previous message: Mathias Nyman: "Re: [PATCH] fix: add XHCI_SPURIOUS_SUCCESS to ASM1042 despite being a V0.96 controller"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]