[syzbot] KASAN: use-after-free Read in hdr_find_e

syzbot
2022-09-27T11:46:49Z

Hello,

syzbot found the following issue on:

HEAD commit: 3800a713b607 Merge tag 'mm-hotfixes-stable-2022-09-26' of ..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10156150880000
kernel config: https://syzkaller.appspot.com/x/.config?x=ba0d23aa7e1ffaf5
dashboard link: https://syzkaller.appspot.com/bug?extid=c986d2a447ac6fb27b02
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=17ffc374880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=102db9ff080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c986d2a447ac6fb27b02@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 264192
ntfs3: loop0: Failed to load $Extend.
==================================================================
BUG: KASAN: use-after-free in hdr_find_e+0x255/0x580 fs/ntfs3/index.c:689
Read of size 2 at addr ffff8880786eb820 by task syz-executor222/3600

CPU: 0 PID: 3600 Comm: syz-executor222 Not tainted 6.0.0-rc7-syzkaller-00029-g3800a713b607 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
print_address_description+0x65/0x4b0 mm/kasan/report.c:317
print_report+0x108/0x1f0 mm/kasan/report.c:433
kasan_report+0xc3/0xf0 mm/kasan/report.c:495
hdr_find_e+0x255/0x580 fs/ntfs3/index.c:689
indx_find+0x4ff/0xb20 fs/ntfs3/index.c:1085
dir_search_u+0x161/0x320 fs/ntfs3/dir.c:254
ntfs_lookup+0x112/0x1b0 fs/ntfs3/namei.c:83
lookup_open fs/namei.c:3391 [inline]
open_last_lookups fs/namei.c:3481 [inline]
path_openat+0x10e6/0x2df0 fs/namei.c:3688
do_filp_open+0x264/0x4f0 fs/namei.c:3718
do_sys_openat2+0x124/0x4e0 fs/open.c:1313
do_sys_open fs/open.c:1329 [inline]
__do_sys_openat fs/open.c:1345 [inline]
__se_sys_openat fs/open.c:1340 [inline]
__x64_sys_openat+0x243/0x290 fs/open.c:1340
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: 0033:0x7f6ebc72f029
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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffda4fbe348 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6ebc72f029
RDX: 000000000000275a RSI: 00000000200001c0 RDI: 00000000ffffff9c
RBP: 00007f6ebc6ee890 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6ebc6ee920
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>

Allocated by task 3253:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:437 [inline]
__kasan_slab_alloc+0xa3/0xd0 mm/kasan/common.c:470
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:727 [inline]
slab_alloc_node mm/slub.c:3248 [inline]
slab_alloc mm/slub.c:3256 [inline]
__kmem_cache_alloc_lru mm/slub.c:3263 [inline]
kmem_cache_alloc+0x1a6/0x310 mm/slub.c:3273
getname_flags+0xb8/0x4e0 fs/namei.c:139
user_path_at_empty+0x2a/0x1a0 fs/namei.c:2875
user_path_at include/linux/namei.h:57 [inline]
user_statfs fs/statfs.c:103 [inline]
__do_sys_statfs fs/statfs.c:195 [inline]
__se_sys_statfs fs/statfs.c:192 [inline]
__x64_sys_statfs+0x106/0x230 fs/statfs.c:192
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

Freed by task 3253:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x3d/0x60 mm/kasan/common.c:45
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370
____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:367
kasan_slab_free include/linux/kasan.h:200 [inline]
slab_free_hook mm/slub.c:1759 [inline]
slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1785
slab_free mm/slub.c:3539 [inline]
kmem_cache_free+0x95/0x1d0 mm/slub.c:3556
putname fs/namei.c:271 [inline]
user_path_at_empty+0x149/0x1a0 fs/namei.c:2878
user_path_at include/linux/namei.h:57 [inline]
user_statfs fs/statfs.c:103 [inline]
__do_sys_statfs fs/statfs.c:195 [inline]
__se_sys_statfs fs/statfs.c:192 [inline]
__x64_sys_statfs+0x106/0x230 fs/statfs.c:192
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 ffff8880786eb300
which belongs to the cache names_cache of size 4096
The buggy address is located 1312 bytes inside of
4096-byte region [ffff8880786eb300, ffff8880786ec300)

The buggy address belongs to the physical page:
page:ffffea0001e1ba00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x786e8
head:ffffea0001e1ba00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff8880121db500
raw: 0000000000000000 0000000000070007 00000001ffffffff 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3253, tgid 3253 (rm), ts 23835929867, free_ts 23812724158
prep_new_page mm/page_alloc.c:2532 [inline]
get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283
__alloc_pages+0x259/0x560 mm/page_alloc.c:5549
alloc_slab_page+0x70/0xf0 mm/slub.c:1829
allocate_slab+0x5e/0x520 mm/slub.c:1974
new_slab mm/slub.c:2034 [inline]
___slab_alloc+0x3ee/0xc40 mm/slub.c:3036
__slab_alloc mm/slub.c:3123 [inline]
slab_alloc_node mm/slub.c:3214 [inline]
slab_alloc mm/slub.c:3256 [inline]
__kmem_cache_alloc_lru mm/slub.c:3263 [inline]
kmem_cache_alloc+0x25d/0x310 mm/slub.c:3273
getname_flags+0xb8/0x4e0 fs/namei.c:139
do_sys_openat2+0xba/0x4e0 fs/open.c:1307
do_sys_open fs/open.c:1329 [inline]
__do_sys_openat fs/open.c:1345 [inline]
__se_sys_openat fs/open.c:1340 [inline]
__x64_sys_openat+0x243/0x290 fs/open.c:1340
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
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1449 [inline]
free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499
free_unref_page_prepare mm/page_alloc.c:3380 [inline]
free_unref_page+0x7d/0x5f0 mm/page_alloc.c:3476
free_slab mm/slub.c:2073 [inline]
discard_slab mm/slub.c:2079 [inline]
__unfreeze_partials+0x1ab/0x200 mm/slub.c:2553
put_cpu_partial+0x106/0x170 mm/slub.c:2629
qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:447
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:727 [inline]
slab_alloc_node mm/slub.c:3248 [inline]
slab_alloc mm/slub.c:3256 [inline]
__kmalloc+0x1bd/0x370 mm/slub.c:4425
kmalloc include/linux/slab.h:605 [inline]
load_elf_phdrs fs/binfmt_elf.c:481 [inline]
load_elf_binary+0x2eb/0x27c0 fs/binfmt_elf.c:861
search_binary_handler fs/exec.c:1727 [inline]
exec_binprm fs/exec.c:1768 [inline]
bprm_execve+0x8dc/0x1590 fs/exec.c:1837
do_execveat_common+0x59b/0x750 fs/exec.c:1942
do_execve fs/exec.c:2016 [inline]
__do_sys_execve fs/exec.c:2092 [inline]
__se_sys_execve fs/exec.c:2087 [inline]
__x64_sys_execve+0x8e/0xa0 fs/exec.c:2087
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

Memory state around the buggy address:
ffff8880786eb700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880786eb780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880786eb800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880786eb880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880786eb900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

---
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