From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f207.google.com (mail-il1-f207.google.com [209.85.166.207]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9F17B15A864 for ; Sun, 9 Mar 2025 11:40:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741520428; cv=none; b=EUXJY2VEUo+ZNz/aDn7DkVFL8EOkZfMyFv8bBubWGzKRq5husMfpT1WfDZp8f8y9pm1g1287/VesXHqQDV2cO9eR+d24C+QMSVEajmryZdVP2S1VlBEq3z2TgOzM6cgSV6+8p7marOxqcZyL6r5U8pASbPmn7SQrCZO3NDxbSi8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741520428; c=relaxed/simple; bh=A7jmwshfHMtHvmApSaG25IVfOUzBcuAuyZmSDluHo48=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=guUIx8D5DTkBT2bLtNSvvN+TuZKJZFod5ddm310O4cXVMYDp2YtoOfifMmEbMi1WsJurSpYVewM9BLeMpoHNmNH5+NXDaH0fsPvZcezw42ddUEBN2yMTv7E8qZpa87r95JP/u/8g2vuDtsqg4fyuwFfa25Z97bQMRgwfMYJoTrk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.207 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f207.google.com with SMTP id e9e14a558f8ab-3d44b221f0dso31651755ab.1 for ; Sun, 09 Mar 2025 04:40:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1741520426; x=1742125226; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=p9PJXD/jSiwFyiuecIvnhM1qNW/tF7+/fyvR00xRfU0=; b=I7N5chac2e3DZFFxxAA7YefDU/UrOsZIScMj6Q2rwj6yUuJW804kRJHqL3tyCzr5Ps PgTlO+syZEybY2gB9GE3bxGx6waPpCKcTevYedNQQziK+JgtffdfTzA9phFrjZiY35MF pxCqFqqOsBiWciMrXCLGPkkIREvkegh8o0TM/b5SZd79nX2O8GBVBheecSb1vxxhsqnO OXBJbwN4BUbXzh9/Nberdp5r9S1qGX1QG89cdiB8aYQ6hx2qwVaDKrehOM3oacYX2aG8 x1Ev7dvYdc9H8nS7vNOXLvvKR7oxahrx2UGUwHbB1dMZQkgoRjlbmFy9M4rLGMAr+6hq rS/A== X-Forwarded-Encrypted: i=1; AJvYcCV7jeDaWbM7stntaFROImF71a+d3ydruba+wOuSMdp0SJcFcv3wi8FvA3eCNviMFTihGrCcvANIXxDEIxE=@vger.kernel.org X-Gm-Message-State: AOJu0Yx9yPqedW4NMT/XfC4HKkTmvzlIjX6sh5Pof0cHYOZa7ASN8yNU S6WoWai1BIsdGFVyt5/087mgjYYvzL1oWCf0SVRQTCjRmWoMsvAddeu741UExtXzRywqc/UMiE6 nN9ej1E1cKjKSiwlEGLXIFBKjFBqsT3njeZL5T41Xp+u7pH2UJvzBo2g= X-Google-Smtp-Source: AGHT+IErptT0tInK262zP60/UqsMh6kXrpP3aaCRPMgoIPi1iPw09F23416AriWDQdT2Iz6XIGCs2mgG3fb80/3Zuwfh7m6Xy5CY Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3008:b0:3d3:d07d:20a3 with SMTP id e9e14a558f8ab-3d4418cf719mr115685665ab.10.1741520425780; Sun, 09 Mar 2025 04:40:25 -0700 (PDT) Date: Sun, 09 Mar 2025 04:40:25 -0700 In-Reply-To: <67483b75.050a0220.253251.007c.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67cd7e29.050a0220.e1a89.0007.GAE@google.com> Subject: Re: [syzbot] [ocfs2?] KASAN: slab-out-of-bounds Read in ocfs2_dx_dir_lookup_rec From: syzbot To: jlbec@evilplan.org, joseph.qi@linux.alibaba.com, linux-kernel@vger.kernel.org, mark@fasheh.com, ocfs2-devel@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: b7c90e3e717a Merge tag 'x86-urgent-2025-03-08' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14f8fa54580000 kernel config: https://syzkaller.appspot.com/x/.config?x=2040405600e83619 dashboard link: https://syzkaller.appspot.com/bug?extid=20282c1b2184a857ac4c compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17c58664580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17b1d878580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-b7c90e3e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b1f83f46f4b5/vmlinux-b7c90e3e.xz kernel image: https://storage.googleapis.com/syzbot-assets/7d502ab93205/bzImage-b7c90e3e.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/e57bf738b48c/mount_7.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=171a1fa0580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+20282c1b2184a857ac4c@syzkaller.appspotmail.com On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted. OCFS2: File system is now read-only. (syz-executor398,5304,0):ocfs2_find_entry_dx:1029 ERROR: status = -30 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 5304 Comm: syz-executor398 Not tainted 6.14.0-rc5-syzkaller-00234-gb7c90e3e717a #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:ocfs2_dx_dir_lookup_rec+0x325/0x810 fs/ocfs2/dir.c:812 Code: 20 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 4a 4b 6f fe 48 8b 03 48 89 44 24 30 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 c0 03 00 00 45 8b 3c 24 4c 89 f0 48 c1 RSP: 0018:ffffc9000d14eb40 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8880447788b8 RCX: ffff8880006f2440 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880447788a0 RBP: ffffc9000d14ec50 R08: ffffffff83b9ce2e R09: ffffc9000d14ece0 R10: 23ec6d672c196c9a R11: 608b7c562adf3b03 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8880491092c0 R15: ffff8880491092c0 FS: 000055556a600380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055721be84000 CR3: 000000003ef6e000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ocfs2_dx_dir_lookup+0x163/0x930 fs/ocfs2/dir.c:860 ocfs2_dx_dir_search fs/ocfs2/dir.c:920 [inline] ocfs2_find_entry_dx fs/ocfs2/dir.c:1034 [inline] ocfs2_find_entry+0x1309/0x2570 fs/ocfs2/dir.c:1071 ocfs2_check_dir_for_entry+0x17b/0x4a0 fs/ocfs2/dir.c:2040 ocfs2_mknod+0x83c/0x2b30 fs/ocfs2/namei.c:288 ocfs2_create+0x1ab/0x470 fs/ocfs2/namei.c:673 lookup_open fs/namei.c:3651 [inline] open_last_lookups fs/namei.c:3750 [inline] path_openat+0x193c/0x3590 fs/namei.c:3986 do_filp_open+0x27f/0x4e0 fs/namei.c:4016 do_sys_openat2+0x13e/0x1d0 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1454 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4c42698bf9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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:00007ffef4145088 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f4c426649e3 RCX: 00007f4c42698bf9 RDX: 0000000000105042 RSI: 0000400000000080 RDI: 00000000ffffff9c RBP: 0000400000000040 R08: 00000000000b45f8 R09: 00000000000b45f8 R10: 00000000000001ff R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffef4145258 R14: 0000000000000001 R15: 0000000000000001 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ocfs2_dx_dir_lookup_rec+0x325/0x810 fs/ocfs2/dir.c:812 Code: 20 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 4a 4b 6f fe 48 8b 03 48 89 44 24 30 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 c0 03 00 00 45 8b 3c 24 4c 89 f0 48 c1 RSP: 0018:ffffc9000d14eb40 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8880447788b8 RCX: ffff8880006f2440 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880447788a0 RBP: ffffc9000d14ec50 R08: ffffffff83b9ce2e R09: ffffc9000d14ece0 R10: 23ec6d672c196c9a R11: 608b7c562adf3b03 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8880491092c0 R15: ffff8880491092c0 FS: 000055556a600380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055721bea2000 CR3: 000000003ef6e000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 20 48 83 and %cl,-0x7d(%rax) 3: c3 ret 4: 40 rex 5: 48 89 d8 mov %rbx,%rax 8: 48 c1 e8 03 shr $0x3,%rax c: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 11: 74 08 je 0x1b 13: 48 89 df mov %rbx,%rdi 16: e8 4a 4b 6f fe call 0xfe6f4b65 1b: 48 8b 03 mov (%rbx),%rax 1e: 48 89 44 24 30 mov %rax,0x30(%rsp) 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 c0 03 00 00 jne 0x3f7 37: 45 8b 3c 24 mov (%r12),%r15d 3b: 4c 89 f0 mov %r14,%rax 3e: 48 rex.W 3f: c1 .byte 0xc1 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.