[syzbot] [erofs?] KASAN: slab-use-after-free Read in z_erofs_decompress_queue
syzbot
syzbot+7ff87b095e7ca0c5ac39 at syzkaller.appspotmail.com
Sun Dec 1 18:37:25 AEDT 2024
Hello,
syzbot found the following issue on:
HEAD commit: 2ba9f676d0a2 Merge tag 'drm-next-2024-11-29' of https://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14a9ff5f980000
kernel config: https://syzkaller.appspot.com/x/.config?x=7903df3280dd39ea
dashboard link: https://syzkaller.appspot.com/bug?extid=7ff87b095e7ca0c5ac39
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e84f83a0add4/disk-2ba9f676.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7468420d8610/vmlinux-2ba9f676.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fd3f74d41f94/bzImage-2ba9f676.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7ff87b095e7ca0c5ac39 at syzkaller.appspotmail.com
erofs (device loop7): failed to decompress -41 in[4096, 0] out[9000]
==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: slab-use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
BUG: KASAN: slab-use-after-free in queued_spin_trylock include/asm-generic/qspinlock.h:92 [inline]
BUG: KASAN: slab-use-after-free in do_raw_spin_trylock+0x72/0x1f0 kernel/locking/spinlock_debug.c:123
Read of size 4 at addr ffff888057feb0b0 by task kworker/u9:4/5836
CPU: 0 UID: 0 PID: 5836 Comm: kworker/u9:4 Not tainted 6.12.0-syzkaller-11677-g2ba9f676d0a2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: erofs_worker z_erofs_decompressqueue_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0x169/0x550 mm/kasan/report.c:489
kasan_report+0x143/0x180 mm/kasan/report.c:602
kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
instrument_atomic_read include/linux/instrumented.h:68 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
queued_spin_trylock include/asm-generic/qspinlock.h:92 [inline]
do_raw_spin_trylock+0x72/0x1f0 kernel/locking/spinlock_debug.c:123
__raw_spin_trylock include/linux/spinlock_api_smp.h:89 [inline]
_raw_spin_trylock+0x20/0x80 kernel/locking/spinlock.c:138
spin_trylock include/linux/spinlock.h:361 [inline]
z_erofs_put_pcluster fs/erofs/zdata.c:959 [inline]
z_erofs_decompress_pcluster fs/erofs/zdata.c:1403 [inline]
z_erofs_decompress_queue+0x3798/0x3ef0 fs/erofs/zdata.c:1425
z_erofs_decompressqueue_work+0x99/0xe0 fs/erofs/zdata.c:1437
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa68/0x1840 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Allocated by task 9865:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__kmalloc_cache_noprof+0x243/0x390 mm/slub.c:4314
kmalloc_noprof include/linux/slab.h:901 [inline]
kzalloc_noprof include/linux/slab.h:1037 [inline]
erofs_init_fs_context+0x55/0x2c0 fs/erofs/super.c:790
alloc_fs_context+0x68c/0x800 fs/fs_context.c:318
do_new_mount+0x160/0xb40 fs/namespace.c:3486
do_mount fs/namespace.c:3847 [inline]
__do_sys_mount fs/namespace.c:4057 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 8390:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2338 [inline]
slab_free mm/slub.c:4598 [inline]
kfree+0x196/0x430 mm/slub.c:4746
erofs_kill_sb+0x197/0x1c0 fs/erofs/super.c:824
deactivate_locked_super+0xc6/0x130 fs/super.c:473
cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
task_work_run+0x251/0x310 kernel/task_work.c:239
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888057feb000
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 176 bytes inside of
freed 1024-byte region [ffff888057feb000, ffff888057feb400)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x57fe8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801ac41dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000001f5000000 0000000000000000
head: 00fff00000000040 ffff88801ac41dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000001f5000000 0000000000000000
head: 00fff00000000003 ffffea00015ffa01 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5838, tgid 5838 (syz-executor), ts 79303051865, free_ts 23181394506
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556
prep_new_page mm/page_alloc.c:1564 [inline]
get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3474
__alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4751
alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
alloc_slab_page+0x6a/0x140 mm/slub.c:2408
allocate_slab+0x5a/0x2f0 mm/slub.c:2574
new_slab mm/slub.c:2627 [inline]
___slab_alloc+0xcd1/0x14b0 mm/slub.c:3815
__slab_alloc+0x58/0xa0 mm/slub.c:3905
__slab_alloc_node mm/slub.c:3980 [inline]
slab_alloc_node mm/slub.c:4141 [inline]
__do_kmalloc_node mm/slub.c:4282 [inline]
__kmalloc_node_track_caller_noprof+0x2e9/0x4c0 mm/slub.c:4302
kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:609
__alloc_skb+0x1f3/0x440 net/core/skbuff.c:678
alloc_skb include/linux/skbuff.h:1323 [inline]
nlmsg_new include/net/netlink.h:1018 [inline]
inet6_rt_notify+0xba/0x240 net/ipv6/route.c:6195
fib6_add_rt2node net/ipv6/ip6_fib.c:1259 [inline]
fib6_add+0x1e33/0x4420 net/ipv6/ip6_fib.c:1488
__ip6_ins_rt net/ipv6/route.c:1317 [inline]
ip6_route_add+0x8b/0x160 net/ipv6/route.c:3857
addrconf_prefix_route net/ipv6/addrconf.c:2486 [inline]
addrconf_add_linklocal+0x61a/0xa30 net/ipv6/addrconf.c:3338
addrconf_addr_gen+0x510/0xbb0
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1127 [inline]
free_unref_page+0xdef/0x1130 mm/page_alloc.c:2657
free_contig_range+0x152/0x550 mm/page_alloc.c:6630
destroy_args+0x92/0x910 mm/debug_vm_pgtable.c:1017
debug_vm_pgtable+0x4be/0x550 mm/debug_vm_pgtable.c:1397
do_one_initcall+0x24a/0x870 init/main.c:1266
do_initcall_level+0x157/0x210 init/main.c:1328
do_initcalls+0x3f/0x80 init/main.c:1344
kernel_init_freeable+0x435/0x5d0 init/main.c:1577
kernel_init+0x1d/0x2b0 init/main.c:1466
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Memory state around the buggy address:
ffff888057feaf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888057feb000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888057feb080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888057feb100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888057feb180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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