loop0: detected capacity change from 0 to 256
exfat: Deprecated parameter 'namecase'
exFAT-fs (loop0): failed to load upcase table (idx : 0x00010000, chksum : 0x5441951d, utbl_chksum : 0xe619d30d)
==================================================================
BUG: KASAN: stack-out-of-bounds in exfat_nls_to_ucs2+0x706/0x730 fs/exfat/nls.c:619
Read of size 1 at addr ffffc9000383fcc8 by task syz.0.17/5984
CPU: 1 UID: 0 PID: 5984 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
exfat_nls_to_ucs2+0x706/0x730 fs/exfat/nls.c:619
exfat_nls_to_utf16+0xa6/0xf0 fs/exfat/nls.c:647
exfat_ioctl_set_volume_label+0x15d/0x230 fs/exfat/file.c:524
exfat_ioctl+0x929/0x1630 fs/exfat/file.c:554
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbf7418eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd30025cd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbf743e5fa0 RCX: 00007fbf7418eec9
RDX: 00002000000001c0 RSI: 0000000041009432 RDI: 0000000000000004
RBP: 00007fbf74211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbf743e5fa0 R14: 00007fbf743e5fa0 R15: 0000000000000003
</TASK>
The buggy address belongs to stack of task syz.0.17/5984
and is located at offset 960 in frame:
exfat_ioctl_set_volume_label+0x0/0x230 fs/exfat/file.c:507
This frame has 3 objects:
[32, 36) 'lossy'
[48, 568) 'uniname'
[704, 960) 'label'
The buggy address belongs to a vmalloc virtual mapping
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888078e7c000 pfn:0x78e7c
memcg:ffff88803262e802
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: ffff888078e7c000 0000000000000000 00000001ffffffff ffff88803262e802
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_ZERO|__GFP_NOWARN), pid 5950, tgid 5950 (dhcpcd-run-hook), ts 127646754846, free_ts 127600338916
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x10a3/0x3a30 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x25f/0x2470 mm/page_alloc.c:5183
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
alloc_pages_noprof+0x131/0x390 mm/mempolicy.c:2507
vm_area_alloc_pages mm/vmalloc.c:3647 [inline]
__vmalloc_area_node mm/vmalloc.c:3724 [inline]
__vmalloc_node_range_noprof+0x6f8/0x1480 mm/vmalloc.c:3897
__vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:3960
alloc_thread_stack_node kernel/fork.c:311 [inline]
dup_task_struct kernel/fork.c:881 [inline]
copy_process+0x2c77/0x76a0 kernel/fork.c:2012
kernel_clone+0xfc/0x930 kernel/fork.c:2609
__do_sys_clone+0xce/0x120 kernel/fork.c:2750
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 12 tgid 12 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0x7df/0x1160 mm/page_alloc.c:2906
rcu_do_batch kernel/rcu/tree.c:2605 [inline]
rcu_core+0x79c/0x1530 kernel/rcu/tree.c:2861
handle_softirqs+0x219/0x8e0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
sysvec_call_function_single+0xa4/0xc0 arch/x86/kernel/smp.c:266
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:704
Memory state around the buggy address:
ffffc9000383fb80: f2 f2 f2 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00
ffffc9000383fc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000383fc80: 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3
^
ffffc9000383fd00: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffffc9000383fd80: 00 00 00 00 f1 f1 f1 f1 f1 f1 00 00 00 f2 f2 f2
==================================================================