From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (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 713B817BA1 for ; Tue, 31 Dec 2024 13:10:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735650629; cv=none; b=TPus5dqk3VUWScThq4yfYvkEFgyl+NBCYG+yigYH9wZAdwfFqgmRLqPMG8dXxdLNyVJK1zcNZ/IVNWSqOewU6WGG17LH1zHwsgHgL5BwJqtP/GI0r0Ie1qtFL5rJUOTJPPcX4w2dqjBI6IlwM/L2jXMLmA3RrLPrV22BohjY/nk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735650629; c=relaxed/simple; bh=AjCqaO/c2C/1RVEwiGokVYVRzXvQ/dPY0ku/Xu31DRI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=QYxb4IKYLqN/kaDLB++D133m0Up2jq9jvBk0f2Zktfrbqu0uay5IcqUiZrXxvcRmO3lXlNa6/Gr6P6GTHcC3Yeybd/uys74bFL07/+MPETnyYjb/jd7UoQHxkhl57pNn40DNh/H81ZNsWlfKekVl9Qi7r9Iwlx6mVooKkIhTato= 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=209.85.166.208 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-f208.google.com with SMTP id e9e14a558f8ab-3a9cbe8fea1so104282395ab.3 for ; Tue, 31 Dec 2024 05:10:26 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1735650625; x=1736255425; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=7TiVZTCLlQn31lb/WNkxKEnOV/dYgmRGEbigOHLfObQ=; b=iv9ZFfJ1HSiMHqoHAzV4I7QI9R+Dl38fvhFZvCKZoedYPizeyIo252hs1DPcY4x3xu OnyqK+UjZP68lAimvTaUhCfiMWIWb5bDUuQivHMpQAl20sS26wKznQrttYdbqRbM26V0 WGdVHQi9sChGEreuHxKf15ErmMYQ8cxnCgpP5hNR4yLFBn+omyh1rWV/XPPp2bKmqh/S 3/COklrA06eLDGOTwECGNL0HbKzEryRKNxn+ju+U24EVvZeL5wq3PeKBjTnWP/96HoFs DRKbW6Fl9FHW2BT/K5TKbfVhdQFAb/ggl3Z/+wHfijpw875HLahLaC+CVKj9uL2Ru8or Em6w== X-Gm-Message-State: AOJu0YxbtwkV744PomjmB7q2v4M79LzRjRfk7la9V7aNFfGvNQFiTlf1 9Xri3pLzVscR8EzoAAZOVL2sGThmR4aEWKZa3zdJIqSucy42Z42VYQpXOTciG/UePLtkmQP3IfW 4aIAH/Gb6AoQQYbOSjyKh3o7AlhDqWRORQKMyMoQhaxgD4QJ1dsj/m7Jr2A== X-Google-Smtp-Source: AGHT+IE6OzQorZvdhq+z5mFvPRoea3wmFwX5FM+x7wOva8whmvhvOdYWo3EKlGyqef48YR3LVabgPYdqr41ea5ijB0qtFj6Pe0gR Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1685:b0:3a7:6e59:33ad with SMTP id e9e14a558f8ab-3c2d4e6c573mr255226405ab.17.1735650625403; Tue, 31 Dec 2024 05:10:25 -0800 (PST) Date: Tue, 31 Dec 2024 05:10:25 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6773ed41.050a0220.25abdd.08f6.GAE@google.com> Subject: [syzbot] [fuse?] BUG: unable to handle kernel NULL pointer dereference in fuse_copy_one From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, miklos@szeredi.hu, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: ccb98ccef0e5 Merge tag 'platform-drivers-x86-v6.13-4' of g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14d4f50f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=86dd15278dbfe19f dashboard link: https://syzkaller.appspot.com/bug?extid=43f6243d6c4946b26405 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-ccb98cce.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/75a6223b351c/vmlinux-ccb98cce.xz kernel image: https://storage.googleapis.com/syzbot-assets/beea89d50f58/bzImage-ccb98cce.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+43f6243d6c4946b26405@syzkaller.appspotmail.com BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 6a754067 P4D 6a754067 PUD 68142067 PMD 0 Oops: Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 7523 Comm: syz.2.395 Not tainted 6.13.0-rc5-syzkaller-00004-gccb98ccef0e5 #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:memcpy+0xc/0x20 arch/x86/lib/memcpy_64.S:38 Code: e9 44 fd ff ff 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 48 89 f8 48 89 d1 a4 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 RSP: 0018:ffffc9000370f8b0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffc9000370fc50 RCX: 0000000000000004 RDX: 0000000000000004 RSI: ffff88804ef5d710 RDI: 0000000000000000 RBP: 0000000000000004 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 R13: 0000000000000000 R14: 0000000000000004 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88802b400000(0063) knlGS:00000000f5080b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000006ba72000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fuse_copy_do fs/fuse/dev.c:809 [inline] fuse_copy_one+0x1cc/0x230 fs/fuse/dev.c:1065 fuse_copy_args+0x109/0x690 fs/fuse/dev.c:1083 copy_out_args fs/fuse/dev.c:1966 [inline] fuse_dev_do_write+0x1b0a/0x3100 fs/fuse/dev.c:2052 fuse_dev_write+0x160/0x1f0 fs/fuse/dev.c:2087 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:679 ksys_write+0x12b/0x250 fs/read_write.c:731 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf708e579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5080500 EFLAGS: 00000293 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000700 RDX: 0000000000000014 RSI: 00000000f73c3ff4 RDI: 0000000000000000 RBP: 0000000020008380 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: CR2: 0000000000000000 ---[ end trace 0000000000000000 ]--- RIP: 0010:memcpy+0xc/0x20 arch/x86/lib/memcpy_64.S:38 Code: e9 44 fd ff ff 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 48 89 f8 48 89 d1 a4 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 RSP: 0018:ffffc9000370f8b0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffc9000370fc50 RCX: 0000000000000004 RDX: 0000000000000004 RSI: ffff88804ef5d710 RDI: 0000000000000000 RBP: 0000000000000004 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 R13: 0000000000000000 R14: 0000000000000004 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88802b400000(0063) knlGS:00000000f5080b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000006ba72000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: e9 44 fd ff ff jmp 0xfffffd49 5: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1) c: 00 00 e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: f3 0f 1e fa endbr64 22: 66 90 xchg %ax,%ax 24: 48 89 f8 mov %rdi,%rax 27: 48 89 d1 mov %rdx,%rcx * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: c3 ret 2d: cc int3 2e: cc int3 2f: cc int3 30: cc int3 31: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) 38: 00 00 00 00 3c: 66 90 xchg %ax,%ax 3e: 90 nop 3f: 90 nop --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup