linux-kernel - Re: [syzbot] [ext4?] WARNING in ext4_xattr_block

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <0000000000003d606105fad075eb@google.com>
Date:   Wed, 03 May 2023 14:08:30 -0700
From:   syzbot <syzbot+6385d7d3065524c5ca6d@...kaller.appspotmail.com>
To:     adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: Re: [syzbot] [ext4?] WARNING in ext4_xattr_block_set (2)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in ext4_xattr_block_set

------------[ cut here ]------------
WARNING: CPU: 1 PID: 5863 at fs/ext4/xattr.c:2141 ext4_xattr_block_set+0x2ef2/0x3680
Modules linked in:
CPU: 1 PID: 5863 Comm: syz-executor.1 Not tainted 6.3.0-rc3-syzkaller-00111-gd4fab7b28e2f-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
RIP: 0010:ext4_xattr_block_set+0x2ef2/0x3680 fs/ext4/xattr.c:2141
Code: da 3f ff 48 8b 7c 24 50 4c 89 ee e8 98 36 c2 ff 45 31 ed e9 86 f4 ff ff e8 2b da 3f ff 45 31 ed e9 79 f4 ff ff e8 1e da 3f ff <0f> 0b e9 5d f2 ff ff e8 12 da 3f ff 0f 0b 43 80 3c 26 00 0f 85 6f
RSP: 0018:ffffc900062df4a0 EFLAGS: 00010293
RAX: ffffffff824a9302 RBX: 1ffff92000c5bf11 RCX: ffff888077008000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffc900062df6d0 R08: ffffffff82103f70 R09: ffffed100d986aae
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffffc900062df860
FS:  00007faf2d136700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1f5413f440 CR3: 000000006a2a8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_xattr_set_handle+0xcd4/0x15c0 fs/ext4/xattr.c:2458
 ext4_initxattrs+0xa3/0x110 fs/ext4/xattr_security.c:44
 security_inode_init_security+0x2df/0x3f0 security/security.c:1147
 __ext4_new_inode+0x341c/0x42e0 fs/ext4/ialloc.c:1322
 ext4_mkdir+0x425/0xce0 fs/ext4/namei.c:2991
 vfs_mkdir+0x29d/0x450 fs/namei.c:4038
 do_mkdirat+0x264/0x520 fs/namei.c:4061
 __do_sys_mkdirat fs/namei.c:4076 [inline]
 __se_sys_mkdirat fs/namei.c:4074 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4074
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7faf2c48c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007faf2d136168 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007faf2c5abf80 RCX: 00007faf2c48c0f9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000005
RBP: 00007faf2c4e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd76b57a0f R14: 00007faf2d136300 R15: 0000000000022000
 </TASK>


Tested on:

commit:         d4fab7b2 ext4: clean up error handling in __ext4_fill_..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
console output: https://syzkaller.appspot.com/x/log.txt?x=16366e18280000
kernel config:  https://syzkaller.appspot.com/x/.config?x=acdb62bf488a8fe5
dashboard link: https://syzkaller.appspot.com/bug?extid=6385d7d3065524c5ca6d
compiler:       Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
patch:          https://syzkaller.appspot.com/x/patch.diff?x=10c9cef2280000