linux-kernel - Re: [syzbot] [ntfs3?] WARNING in indx_insert_into

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Message-ID: <68e5a23e.050a0220.256323.002d.GAE@google.com>
Date: Tue, 07 Oct 2025 16:29:02 -0700
From: syzbot <syzbot+3a1878433bc1cb97b42a@...kaller.appspotmail.com>
To: jkoolstra@...all.nl, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ntfs3?] WARNING in indx_insert_into_buffer (3)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in indx_insert_into_buffer

loop0: detected capacity change from 0 to 4096
------------[ cut here ]------------
memcpy: detected field-spanning write (size 3656) of single field "&n1->index->blk" at fs/ntfs3/index.c:1927 (size 16)
WARNING: CPU: 1 PID: 6418 at fs/ntfs3/index.c:1927 indx_insert_into_buffer.isra.0+0x109a/0x1320 fs/ntfs3/index.c:1927
Modules linked in:
CPU: 1 UID: 0 PID: 6418 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:indx_insert_into_buffer.isra.0+0x109a/0x1320 fs/ntfs3/index.c:1927
Code: 0c d5 a3 fe c6 05 3a ad 30 0d 01 90 48 8b 74 24 68 b9 10 00 00 00 48 c7 c2 60 68 a7 8b 48 c7 c7 c0 68 a7 8b e8 87 5b 62 fe 90 <0f> 0b 90 90 e9 b0 fd ff ff e8 38 56 0b ff e9 f4 f3 ff ff e8 2e 56
RSP: 0018:ffffc90003a0f748 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 00000000ffffffe4 RCX: ffffffff817a4b08
RDX: ffff888025980000 RSI: ffffffff817a4b15 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88807927e800
R13: ffff88805862a800 R14: dffffc0000000000 R15: 0000000000000e48
FS:  00007f94fb6426c0(0000) GS:ffff888124f62000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3ee058dd30 CR3: 00000000616dd000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 indx_insert_entry+0x1a0/0x460 fs/ntfs3/index.c:1996
 ni_add_name+0x4dd/0x820 fs/ntfs3/frecord.c:2995
 ni_rename+0x98/0x170 fs/ntfs3/frecord.c:3026
 ntfs_rename+0xab9/0xf00 fs/ntfs3/namei.c:332
 vfs_rename+0xfa3/0x2290 fs/namei.c:5216
 do_renameat2+0x7d8/0xc20 fs/namei.c:5364
 __do_sys_rename fs/namei.c:5411 [inline]
 __se_sys_rename fs/namei.c:5409 [inline]
 __x64_sys_rename+0x7d/0xa0 fs/namei.c:5409
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f94fa78eec9
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:00007f94fb642038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f94fa9e5fa0 RCX: 00007f94fa78eec9
RDX: 0000000000000000 RSI: 0000200000000f40 RDI: 00002000000003c0
RBP: 00007f94fa811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f94fa9e6038 R14: 00007f94fa9e5fa0 R15: 00007ffce10dde88
 </TASK>


Tested on:

commit:         a8cdf51c Merge tag 'hardening-fix1-v6.18-rc1' of git:/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16277334580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7e89ecd5e8107dd4
dashboard link: https://syzkaller.appspot.com/bug?extid=3a1878433bc1cb97b42a
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14a8e892580000