[syzbot] KASAN: slab-out-of-bounds Write in hfs_asc2mac

From: syzbot
Date: Fri Nov 25 2022 - 04:47:22 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 4312098baf37 Merge tag 'spi-fix-v6.1-rc6' of git://git.ker..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11fd0a73880000
kernel config: https://syzkaller.appspot.com/x/.config?x=8d01b6e3197974dd
dashboard link: https://syzkaller.appspot.com/bug?extid=dc3b1cf9111ab5fe98e7
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13e49a3d880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11a15a73880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4b7073d20a37/disk-4312098b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/36a0367a5593/vmlinux-4312098b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/265bedb3086b/bzImage-4312098b.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/cf5f83add496/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dc3b1cf9111ab5fe98e7@xxxxxxxxxxxxxxxxxxxxxxxxx

loop0: detected capacity change from 0 to 64
==================================================================
BUG: KASAN: slab-out-of-bounds in hfs_asc2mac+0x467/0x9a0 fs/hfs/trans.c:133
Write of size 1 at addr ffff88801848314e by task syz-executor391/3632

CPU: 0 PID: 3632 Comm: syz-executor391 Not tainted 6.1.0-rc6-syzkaller-00012-g4312098baf37 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
print_address_description+0x74/0x340 mm/kasan/report.c:284
print_report+0x107/0x1f0 mm/kasan/report.c:395
kasan_report+0xcd/0x100 mm/kasan/report.c:495
hfs_asc2mac+0x467/0x9a0 fs/hfs/trans.c:133
hfs_cat_build_key+0x92/0x170 fs/hfs/catalog.c:28
hfs_lookup+0x1ab/0x2c0 fs/hfs/dir.c:31
lookup_open fs/namei.c:3391 [inline]
open_last_lookups fs/namei.c:3481 [inline]
path_openat+0x10e6/0x2df0 fs/namei.c:3710
do_filp_open+0x264/0x4f0 fs/namei.c:3740
do_sys_openat2+0x124/0x4e0 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+0x221/0x270 fs/open.c:1330
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: 0033:0x7fdc79c9d839
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd57f47648 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdc79c9d839
RDX: 0000000000000100 RSI: 0000000000002000 RDI: 0000000020000800
RBP: 00007fdc79c5d0d0 R08: 0000000000000245 R09: 0000000000000000
R10: 00007ffd57f47510 R11: 0000000000000246 R12: 00007fdc79c5d160
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>

Allocated by task 3632:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x3d/0x60 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:371 [inline]
__kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slab_common.c:955 [inline]
__kmalloc+0xaf/0x1a0 mm/slab_common.c:968
kmalloc include/linux/slab.h:558 [inline]
hfs_find_init+0x8b/0x1e0 fs/hfs/bfind.c:21
hfs_lookup+0x105/0x2c0 fs/hfs/dir.c:28
lookup_open fs/namei.c:3391 [inline]
open_last_lookups fs/namei.c:3481 [inline]
path_openat+0x10e6/0x2df0 fs/namei.c:3710
do_filp_open+0x264/0x4f0 fs/namei.c:3740
do_sys_openat2+0x124/0x4e0 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+0x221/0x270 fs/open.c:1330
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 ffff888018483100
which belongs to the cache kmalloc-96 of size 96
The buggy address is located 78 bytes inside of
96-byte region [ffff888018483100, ffff888018483160)

The buggy address belongs to the physical page:
page:ffffea00006120c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x18483
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 dead000000000100 dead000000000122 ffff888012841780
raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 2311131230, free_ts 0
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4288
__alloc_pages+0x259/0x560 mm/page_alloc.c:5555
alloc_page_interleave+0x22/0x1c0 mm/mempolicy.c:2118
alloc_slab_page+0x70/0xf0 mm/slub.c:1794
allocate_slab+0x5e/0x4b0 mm/slub.c:1939
new_slab mm/slub.c:1992 [inline]
___slab_alloc+0x782/0xe20 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
__kmem_cache_alloc_node+0x252/0x310 mm/slub.c:3437
__do_kmalloc_node mm/slab_common.c:954 [inline]
__kmalloc_node_track_caller+0x9c/0x190 mm/slab_common.c:975
__do_krealloc mm/slab_common.c:1348 [inline]
krealloc+0x61/0xf0 mm/slab_common.c:1381
add_sysfs_param+0x134/0x800 kernel/params.c:660
kernel_add_sysfs_param+0xb0/0x126 kernel/params.c:812
param_sysfs_builtin+0x1fb/0x2a5 kernel/params.c:851
param_sysfs_init+0x68/0x6c kernel/params.c:970
do_one_initcall+0x1c9/0x400 init/main.c:1303
do_initcall_level+0x168/0x218 init/main.c:1376
do_initcalls+0x4b/0x8c init/main.c:1392
page_owner free stack trace missing

Memory state around the buggy address:
ffff888018483000: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888018483080: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
>ffff888018483100: 00 00 00 00 00 00 00 00 00 06 fc fc fc fc fc fc
^
ffff888018483180: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
ffff888018483200: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
==================================================================

---
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