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

From: syzbot
Date: Tue Nov 29 2022 - 05:22:42 EST

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Hello,

syzbot found the following issue on:

HEAD commit: ca57f02295f1 afs: Fix fileserver probe RTT handling
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=166cc703880000
kernel config: https://syzkaller.appspot.com/x/.config?x=2325e409a9a893e1
dashboard link: https://syzkaller.appspot.com/bug?extid=909a2191a4352fd77d25
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=1563673d880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=134d9425880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/af66f1d3a389/disk-ca57f022.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c0c7ec393108/vmlinux-ca57f022.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ea8871940eaa/bzImage-ca57f022.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/a53b54c6bf3b/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+909a2191a4352fd77d25@xxxxxxxxxxxxxxxxxxxxxxxxx

REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
==================================================================
BUG: KASAN: use-after-free in reiserfs_release_objectid+0x528/0x7c0 fs/reiserfs/objectid.c:165
Read of size 14568 at addr ffff8880737890d0 by task syz-executor198/3632

CPU: 1 PID: 3632 Comm: syz-executor198 Not tainted 6.1.0-rc7-syzkaller-00012-gca57f02295f1 #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
kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189
memmove+0x25/0x60 mm/kasan/shadow.c:54
reiserfs_release_objectid+0x528/0x7c0 fs/reiserfs/objectid.c:165
remove_save_link+0x2f6/0x4a0 fs/reiserfs/super.c:542
reiserfs_evict_inode+0x35a/0x460 fs/reiserfs/inode.c:91
evict+0x2a4/0x620 fs/inode.c:664
__dentry_kill+0x3b1/0x5b0 fs/dcache.c:607
dentry_kill+0xbb/0x290
dput+0x1f3/0x410 fs/dcache.c:913
do_renameat2+0xb60/0x1370 fs/namei.c:4932
__do_sys_rename fs/namei.c:4976 [inline]
__se_sys_rename fs/namei.c:4974 [inline]
__x64_sys_rename+0x82/0x90 fs/namei.c:4974
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: 0033:0x7f4da5b02e99
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 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:00007ffdba5119c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007ffdba511ba8 RCX: 00007f4da5b02e99
RDX: 00007f4da5b02e99 RSI: 0000000020000200 RDI: 0000000020000140
RBP: 0000000000000000 R08: 00007ffdba511a30 R09: 00007ffdba511a30
R10: 00007ffdba511a30 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdba511a30 R14: 00007ffdba511a10 R15: 0000000000000000
</TASK>

The buggy address belongs to the physical page:
page:ffffea0001cde240 refcount:2 mapcount:0 mapping:ffff888012c275f8 index:0x10 pfn:0x73789
memcg:ffff888140150000
aops:def_blk_aops ino:700000
flags: 0xfff00000022036(referenced|uptodate|lru|active|private|mappedtodisk|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000022036 ffffea0001ccdf88 ffffea0001cd8cc8 ffff888012c275f8
raw: 0000000000000010 ffff888072933cb0 00000002ffffffff ffff888140150000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 3632, tgid 3632 (syz-executor198), ts 54744108099, free_ts 54728652923
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4291
__alloc_pages+0x259/0x560 mm/page_alloc.c:5558
folio_alloc+0x1a/0x50 mm/mempolicy.c:2295
filemap_alloc_folio+0x7e/0x1c0 mm/filemap.c:971
__filemap_get_folio+0x898/0x1260 mm/filemap.c:1965
pagecache_get_page+0x28/0x260 mm/folio-compat.c:110
find_or_create_page include/linux/pagemap.h:613 [inline]
grow_dev_page+0xba/0x920 fs/buffer.c:946
grow_buffers fs/buffer.c:1011 [inline]
__getblk_slow fs/buffer.c:1038 [inline]
__getblk_gfp+0x16c/0x290 fs/buffer.c:1333
__bread_gfp+0x28/0x320 fs/buffer.c:1367
sb_bread include/linux/buffer_head.h:338 [inline]
read_super_block+0x93/0x820 fs/reiserfs/super.c:1604
reiserfs_fill_super+0x7ff/0x24a0 fs/reiserfs/super.c:1966
mount_bdev+0x26c/0x3a0 fs/super.c:1401
legacy_get_tree+0xea/0x180 fs/fs_context.c:610
vfs_get_tree+0x88/0x270 fs/super.c:1531
do_new_mount+0x289/0xad0 fs/namespace.c:3040
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
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_list+0xb4/0x7b0 mm/page_alloc.c:3529
release_pages+0x232a/0x25c0 mm/swap.c:1055
tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:256 [inline]
tlb_flush_mmu+0x850/0xa70 mm/mmu_gather.c:263
tlb_finish_mmu+0xcb/0x200 mm/mmu_gather.c:363
unmap_region+0x2af/0x300 mm/mmap.c:2191
do_mas_align_munmap+0xd18/0x14e0 mm/mmap.c:2444
do_mas_munmap+0x245/0x2b0 mm/mmap.c:2502
__vm_munmap+0x23c/0x340 mm/mmap.c:2779
__do_sys_munmap mm/mmap.c:2804 [inline]
__se_sys_munmap mm/mmap.c:2801 [inline]
__x64_sys_munmap+0x5c/0x70 mm/mmap.c:2801
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:
ffff88807378af00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88807378af80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807378b000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff88807378b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88807378b100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

---
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Next message: Heiko Stübner: "Re: [PATCH 1/2] dt-bindings: net: rockchip-dwmac: add rk3568 xpcs compatible"
Previous message: Paolo Abeni: "Re: [PATCH RESEND net-next] tcp: socket-specific version of WARN_ON_ONCE()"
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