Message-ID: <000000000000ea3c3105ef377a12@google.com>
Date:   Tue, 06 Dec 2022 23:00:47 -0800
From:   syzbot <syzbot+9fcea5ef6dc4dc72d334@...kaller.appspotmail.com>
To:     almaz.alexandrovich@...agon-software.com,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        nathan@...nel.org, ndesaulniers@...gle.com, ntfs3@...ts.linux.dev,
        syzkaller-bugs@...glegroups.com, trix@...hat.com
Subject: [syzbot] KASAN: slab-out-of-bounds Read in ntfs_listxattr

Hello,

syzbot found the following issue on:

HEAD commit:    8ed710da2873 Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=10027d97880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=50de433dd4debef8
dashboard link: https://syzkaller.appspot.com/bug?extid=9fcea5ef6dc4dc72d334
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=160e0797880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16bf79d5880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/75851d210874/disk-8ed710da.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c70846514634/vmlinux-8ed710da.xz
kernel image: https://storage.googleapis.com/syzbot-assets/34393d745af1/bzImage-8ed710da.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/ce942d5850e5/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9fcea5ef6dc4dc72d334@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 4096
ntfs3: loop0: Different NTFS' sector size (1024) and media sector size (512)
==================================================================
BUG: KASAN: slab-out-of-bounds in ntfs_list_ea fs/ntfs3/xattr.c:191 [inline]
BUG: KASAN: slab-out-of-bounds in ntfs_listxattr+0x401/0x570 fs/ntfs3/xattr.c:710
Read of size 1 at addr ffff888021acaf3d by task syz-executor128/3632

CPU: 1 PID: 3632 Comm: syz-executor128 Not tainted 6.1.0-rc8-syzkaller-00014-g8ed710da2873 #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+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description+0x74/0x340 mm/kasan/report.c:284
 print_report+0x107/0x220 mm/kasan/report.c:395
 kasan_report+0x139/0x170 mm/kasan/report.c:495
 ntfs_list_ea fs/ntfs3/xattr.c:191 [inline]
 ntfs_listxattr+0x401/0x570 fs/ntfs3/xattr.c:710
 vfs_listxattr fs/xattr.c:457 [inline]
 listxattr+0x293/0x2d0 fs/xattr.c:804
 path_listxattr fs/xattr.c:828 [inline]
 __do_sys_llistxattr fs/xattr.c:846 [inline]
 __se_sys_llistxattr fs/xattr.c:843 [inline]
 __x64_sys_llistxattr+0x174/0x230 fs/xattr.c:843
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbd70b66749
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:00007fff05b9d818 EFLAGS: 00000246 ORIG_RAX: 00000000000000c3
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fbd70b66749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0
RBP: 00007fbd70b25fe0 R08: 000000000001f6fe R09: 0000000000000000
R10: 00007fff05b9d6e0 R11: 0000000000000246 R12: 00007fbd70b26070
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 3632:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x70 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]
 ntfs_read_ea+0x437/0x820 fs/ntfs3/xattr.c:110
 ntfs_list_ea fs/ntfs3/xattr.c:168 [inline]
 ntfs_listxattr+0x184/0x570 fs/ntfs3/xattr.c:710
 vfs_listxattr fs/xattr.c:457 [inline]
 listxattr+0x293/0x2d0 fs/xattr.c:804
 path_listxattr fs/xattr.c:828 [inline]
 __do_sys_llistxattr fs/xattr.c:846 [inline]
 __se_sys_llistxattr fs/xattr.c:843 [inline]
 __x64_sys_llistxattr+0x174/0x230 fs/xattr.c:843
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888021acaf00
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 61 bytes inside of
 64-byte region [ffff888021acaf00, ffff888021acaf40)

The buggy address belongs to the physical page:
page:ffffea000086b280 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888021aca080 pfn:0x21aca
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0000796a40 dead000000000005 ffff888012841640
raw: ffff888021aca080 000000008020001d 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 46, tgid 46 (kworker/u4:3), ts 7050450825, free_ts 6956530319
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4291
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5558
 alloc_slab_page+0xbd/0x190 mm/slub.c:1794
 allocate_slab+0x5e/0x4b0 mm/slub.c:1939
 new_slab mm/slub.c:1992 [inline]
 ___slab_alloc+0x7f4/0xeb0 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
 kmalloc_node_trace+0x23/0x60 mm/slab_common.c:1058
 kmalloc_node include/linux/slab.h:575 [inline]
 kzalloc_node include/linux/slab.h:700 [inline]
 __get_vm_area_node+0x13f/0x380 mm/vmalloc.c:2494
 __vmalloc_node_range+0x3a6/0x1400 mm/vmalloc.c:3173
 alloc_thread_stack_node+0x307/0x500 kernel/fork.c:311
 dup_task_struct+0x8b/0x490 kernel/fork.c:974
 copy_process+0x637/0x3fc0 kernel/fork.c:2084
 kernel_clone+0x227/0x640 kernel/fork.c:2671
 user_mode_thread+0x12d/0x190 kernel/fork.c:2747
 call_usermodehelper_exec_work+0x57/0x220 kernel/umh.c:175
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1459 [inline]
 free_pcp_prepare+0x80c/0x8f0 mm/page_alloc.c:1509
 free_unref_page_prepare mm/page_alloc.c:3387 [inline]
 free_unref_page+0x7d/0x630 mm/page_alloc.c:3483
 __vunmap+0x867/0x9d0 mm/vmalloc.c:2713
 free_work+0x66/0x90 mm/vmalloc.c:97
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Memory state around the buggy address:
 ffff888021acae00: 00 00 00 00 01 fc fc fc fc fc fc fc fc fc fc fc
 ffff888021acae80: 00 00 00 00 01 fc fc fc fc fc fc fc fc fc fc fc
>ffff888021acaf00: 00 00 00 00 00 00 00 04 fc fc fc fc fc fc fc fc
                                        ^
 ffff888021acaf80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888021acb000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
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