From nobody Sat Oct 4 21:02:20 2025 Received: from www262.sakura.ne.jp (www262.sakura.ne.jp [202.181.97.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BA8E92EA494 for ; Tue, 12 Aug 2025 14:52:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.181.97.72 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755010366; cv=none; b=QORoy0hcW9yCtouQ3Y1DL7Lg5dnFve5Y4B86LgYvQRxrCqkM4X3evnH0RRNyD3mC3hYmW/9ZqO8iUpdMamBpfm+ROdrB47BaOpBqehy+NqCrbrMWat2LXubE6SKAuU/kWWbdB7D9ogdO3hrQfG/nbCRwj/VUXu+KzIh3jMNMXzo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755010366; c=relaxed/simple; bh=k9ctZhc4mokvNOENdRBcjC6Dp/9kA8HiT2Ytp4Y9nQY=; h=Message-ID:Date:MIME-Version:To:From:Subject:Content-Type; b=MdPatfxzQWTecXuBtGnPrNPnGpOwpiP+s9FtxACkT4S6km/VTqX9rB+h6xnPN6EDzLcgAHv9avcoOY6I+hqp11E2V6gVkG+sMmtmU77JBVpNAY2sxEw8UIoAYyFX7XILyvq2F24KK18DcENnRnkVrW1V079nYECvvU5EM5PLSMw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=I-love.SAKURA.ne.jp; spf=pass smtp.mailfrom=I-love.SAKURA.ne.jp; arc=none smtp.client-ip=202.181.97.72 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=I-love.SAKURA.ne.jp Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=I-love.SAKURA.ne.jp Received: from www262.sakura.ne.jp (localhost [127.0.0.1]) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTP id 57CEqbe4091839; Tue, 12 Aug 2025 23:52:37 +0900 (JST) (envelope-from penguin-kernel@I-love.SAKURA.ne.jp) Received: from [192.168.1.10] (M106072142033.v4.enabler.ne.jp [106.72.142.33]) (authenticated bits=0) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTPSA id 57CEqbL2091836 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NO); Tue, 12 Aug 2025 23:52:37 +0900 (JST) (envelope-from penguin-kernel@I-love.SAKURA.ne.jp) Message-ID: Date: Tue, 12 Aug 2025 23:52:37 +0900 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: Nicolas Pitre , LKML From: Tetsuo Handa Subject: [PATCH] cramfs: Verify inode mode when loading from disk Content-Transfer-Encoding: quoted-printable X-Virus-Status: clean X-Anti-Virus-Server: fsav202.rs.sakura.ne.jp Content-Type: text/plain; charset="utf-8" The inode mode loaded from corrupted disk can be invalid. Do like what commit 0a9e74051313 ("isofs: Verify inode mode when loading from disk") does. Reported-by: syzbot Closes: https://syzkaller.appspot.com/bug?extid=3D895c23f6917da440ed0d Signed-off-by: Tetsuo Handa Acked-by: Nicolas Pitre --- fs/cramfs/inode.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c index b002e9b734f9..12daa85ed941 100644 --- a/fs/cramfs/inode.c +++ b/fs/cramfs/inode.c @@ -116,9 +116,18 @@ static struct inode *get_cramfs_inode(struct super_blo= ck *sb, inode_nohighmem(inode); inode->i_data.a_ops =3D &cramfs_aops; break; - default: + case S_IFCHR: + case S_IFBLK: + case S_IFIFO: + case S_IFSOCK: init_special_inode(inode, cramfs_inode->mode, old_decode_dev(cramfs_inode->size)); + break; + default: + printk(KERN_DEBUG "CRAMFS: Invalid file type 0%04o for inode %lu.\n", + inode->i_mode, inode->i_ino); + iget_failed(inode); + return ERR_PTR(-EIO); } =20 inode->i_mode =3D cramfs_inode->mode; --=20 2.50.1