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Message-ID: <682c32e0.a00a0220.29bc26.0274.GAE@google.com>
Date: Tue, 20 May 2025 00:44:32 -0700
From: syzbot <syzbot+a15182e1a4094a69cbec@...kaller.appspotmail.com>
To: Dai.Ngo@...cle.com, anna@...nel.org, chuck.lever@...cle.com,
davem@...emloft.net, edumazet@...gle.com, horms@...nel.org,
jlayton@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org,
linux-nfs@...r.kernel.org, neilb@...e.de, netdev@...r.kernel.org,
okorniev@...hat.com, pabeni@...hat.com, syzkaller-bugs@...glegroups.com,
tom@...pey.com, trondmy@...nel.org
Subject: [syzbot] [net?] [nfs?] KASAN: slab-out-of-bounds Read in cache_clean
Hello,
syzbot found the following issue on:
HEAD commit: 088d13246a46 Merge tag 'kbuild-fixes-v6.15' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1047ce70580000
kernel config: https://syzkaller.appspot.com/x/.config?x=30181bfb60dbb0a9
dashboard link: https://syzkaller.appspot.com/bug?extid=a15182e1a4094a69cbec
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-088d1324.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/273390076ad5/vmlinux-088d1324.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3de2f79595a2/bzImage-088d1324.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a15182e1a4094a69cbec@...kaller.appspotmail.com
==================================================================
BUG: KASAN: slab-out-of-bounds in hlist_empty include/linux/list.h:972 [inline]
BUG: KASAN: slab-out-of-bounds in cache_clean+0x8a0/0x990 net/sunrpc/cache.c:468
Read of size 8 at addr ffff88802ae03800 by task kworker/1:2/1335
CPU: 1 UID: 0 PID: 1335 Comm: kworker/1:2 Not tainted 6.15.0-rc6-syzkaller-00105-g088d13246a46 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: events_power_efficient do_cache_clean
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xc3/0x670 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
hlist_empty include/linux/list.h:972 [inline]
cache_clean+0x8a0/0x990 net/sunrpc/cache.c:468
do_cache_clean net/sunrpc/cache.c:519 [inline]
do_cache_clean+0x29/0xa0 net/sunrpc/cache.c:512
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 19792:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4327 [inline]
__kmalloc_noprof+0x223/0x510 mm/slub.c:4339
kmalloc_noprof include/linux/slab.h:909 [inline]
kmalloc_array_noprof include/linux/slab.h:948 [inline]
cache_create_net+0x9d/0x220 net/sunrpc/cache.c:1746
nfsd_idmap_init+0x62/0x250 fs/nfsd/nfs4idmap.c:470
nfsd_net_init+0x69/0x3d0 fs/nfsd/nfsctl.c:2198
ops_init+0x1df/0x5f0 net/core/net_namespace.c:138
setup_net+0x21e/0x850 net/core/net_namespace.c:364
copy_net_ns+0x2a6/0x5f0 net/core/net_namespace.c:518
create_new_namespaces+0x3ea/0xad0 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:228
ksys_unshare+0x45b/0xa40 kernel/fork.c:3375
__do_sys_unshare kernel/fork.c:3446 [inline]
__se_sys_unshare kernel/fork.c:3444 [inline]
__x64_sys_unshare+0x31/0x40 kernel/fork.c:3444
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88802ae03000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 0 bytes to the right of
allocated 2048-byte region [ffff88802ae03000, ffff88802ae03800)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ae00
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b442f00 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b442f00 0000000000000000 dead000000000001
head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000ab8001 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 837, tgid 837 (kworker/3:2), ts 32884542472, free_ts 32014442038
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab mm/slub.c:2618 [inline]
new_slab+0x244/0x340 mm/slub.c:2672
___slab_alloc+0xd9c/0x1940 mm/slub.c:3858
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__do_kmalloc_node mm/slub.c:4326 [inline]
__kmalloc_node_track_caller_noprof+0x2ee/0x510 mm/slub.c:4346
kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:599
__alloc_skb+0x166/0x380 net/core/skbuff.c:668
alloc_skb include/linux/skbuff.h:1340 [inline]
mld_newpack.isra.0+0x18e/0xa20 net/ipv6/mcast.c:1788
add_grhead+0x299/0x340 net/ipv6/mcast.c:1899
add_grec+0x112a/0x1680 net/ipv6/mcast.c:2037
mld_send_cr net/ipv6/mcast.c:2163 [inline]
mld_ifc_work+0x41f/0xca0 net/ipv6/mcast.c:2702
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
page last free pid 5792 tgid 5792 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725
discard_slab mm/slub.c:2716 [inline]
__put_partials+0x16d/0x1c0 mm/slub.c:3185
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4147 [inline]
slab_alloc_node mm/slub.c:4196 [inline]
__do_kmalloc_node mm/slub.c:4326 [inline]
__kmalloc_noprof+0x1d4/0x510 mm/slub.c:4339
kmalloc_noprof include/linux/slab.h:909 [inline]
tomoyo_realpath_from_path+0xc2/0x6e0 security/tomoyo/realpath.c:251
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x274/0x460 security/tomoyo/file.c:822
security_inode_getattr+0x116/0x290 security/security.c:2377
vfs_getattr fs/stat.c:256 [inline]
vfs_fstat+0x4b/0xd0 fs/stat.c:278
__do_sys_newfstat+0x91/0x110 fs/stat.c:546
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88802ae03700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88802ae03780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88802ae03800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88802ae03880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88802ae03900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
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@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
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