From patchwork Sun Sep 10 19:30:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 13378549 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 90B58C71153 for ; Sun, 10 Sep 2023 19:31:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231485AbjIJTbL (ORCPT ); Sun, 10 Sep 2023 15:31:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49192 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229973AbjIJTbL (ORCPT ); Sun, 10 Sep 2023 15:31:11 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 01438F5; Sun, 10 Sep 2023 12:31:05 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D595FC433C7; Sun, 10 Sep 2023 19:31:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1694374265; bh=I/kP+37/K+lXfBQv+3hW3TvS0OronJ3WjCcDiC1ontQ=; h=From:Date:Subject:To:Cc:From; b=B6pMg4gAlit/BExol/+r1OCdxqT8SMRltzVW4u9S1Z9bLBOHECHrsi7oS9Jxhud7j f2YCfofwBe1VpYmUJv9m0jcP1Aqav3MQs/QXAGtBRr/UAaZGCCR+TCuy+OrEw6sLe5 pwj6zXI2whMfByBRo9E6hj2HIX0YcLS9eGvVMlpHJISA7MSo5ByPCMxgFYtNcnvCvx 4bRKjsJQ9qm0qZoTSzmcIFz/XcKD8CW1YzfEgP+elUblfanMwdkO0ekHvOZKhG6Kzl Iz7j1oWb/eEP2AaFTc2q2NES6AaNTjUY2Rl5p3ftrICro3Xd02ewcxiO1IN7szTnY/ 2o8Etckjfm+dA== From: Jeff Layton Date: Sun, 10 Sep 2023 15:30:48 -0400 Subject: [PATCH v2] fs: add a new SB_NOUMASK flag MIME-Version: 1.0 Message-Id: <20230910-acl-fix-v2-1-38d6caa81419@kernel.org> X-B4-Tracking: v=1; b=H4sIAGcZ/mQC/2WMQQrCMBBFr1JmbSRNIKauvEfpoqaTdrCkMpGgl NzdsVv5q/f4vB0yMmGGa7MDY6FMWxIwpwbCMqYZFU3CYLSxutNejWFVkd7KRR+966yO1oC8n4y ij1I/CC+UXxt/jnBpf/a/UVolQ3e/uOCnEPztgZxwPW88w1Br/QIxLGcqnwAAAA== To: Alexander Viro , Christian Brauner , Trond Myklebust , Anna Schumaker , Ondrej Valousek Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, Jeff Layton X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=4464; i=jlayton@kernel.org; h=from:subject:message-id; bh=I/kP+37/K+lXfBQv+3hW3TvS0OronJ3WjCcDiC1ontQ=; b=owEBbQKS/ZANAwAIAQAOaEEZVoIVAcsmYgBk/hlyPgcnqzVp4IjuxmkebqY56MJ30B/+4sf9N YFs7m/So2mJAjMEAAEIAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCZP4ZcgAKCRAADmhBGVaC Ffb5EADDQdOcYm7xTa2UNEse4OkFjM6K48Pi7zTQcf0FEQrDqrDsZyT+tDoiOedfg7CJGTCrCrZ 3MYC4WYfDVTfdjRKSradTC1TcCmIxNU2o4KXLSYenzeIaDHeq2fDiJQitMKaEbpoUeM/WH/xg3H kOyKtnn9BuVIbTpdFmzWmIqw5WWRkyRy+1eN1D1N/8DtDmhzhE20aBu4xWA9uIJER93XDm1GZtN p1OUxnvXPjWsnxYl7ORCLPRrS7JfLlokYzNLS+HfI+SU1EjFaQXaZZPLyWgBRcDCAn7set7nnXP 1HY5349GlmeB7p2YreJBFGcyqaUQcB6Iglha25NRTrSM53IvMQF0eHz7vIld4WzaggPyu+GMSoz m+m5I+l32oM7ooxOkiECWTBu6ILFAHFFaw0JF9ZAuT8b3jpdWFG+VKt4HEawCbZzEwmrqLJQ/Kt CSrDD+MQTP5DT0dBNe1659Dj1izmPTk4YysdpJoxFRquyk5ANXSeK2EH0lTGNT9M20dIDr6qLJo L4SCKUAI/UnBLKmTibr8pUvzMTAnbgzJOnN1EjYPCYmA/f6VDIlQc9bgk4kdjj68QP4t5hc+LC3 B8Cm7OHpdEhH8AoA4lwzh+bNgBuH6JF2pYavr3fZQZXTch6aZhPFkEocvNXmmKtQHLEhzIjLgMu vDaXsOre8FgsFBQ== X-Developer-Key: i=jlayton@kernel.org; a=openpgp; fpr=4BC0D7B24471B2A184EAF5D3000E684119568215 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org SB_POSIXACL must be set when a filesystem supports POSIX ACLs, but NFSv4 also sets this flag to prevent the VFS from applying the umask on newly-created files. NFSv4 doesn't support POSIX ACLs however, which causes confusion when other subsystems try to test for them. Split the umask-stripping opt-out into a separate SB_NOUMASK flag, and have NFSv4 set that instead of SB_POSIXACL. Fix the appropriate places in the VFS to check for that flag (in addition to SB_POSIXACL) when stripping the umask. Signed-off-by: Jeff Layton --- Yet another approach to fixing this issue. I think this way is probably the best, since makes the purpose of these flags clearer, and stops NFS from relying on SB_POSIXACL to avoid umask stripping. --- Changes in v2: - new approach: add a new SB_NOUMASK flag that NFSv4 can use instead of SB_POSIXACL - Link to v1: https://lore.kernel.org/r/20230908-acl-fix-v1-1-1e6b76c8dcc8@kernel.org --- fs/init.c | 4 ++-- fs/namei.c | 2 +- fs/nfs/super.c | 2 +- include/linux/fs.h | 4 +++- 4 files changed, 7 insertions(+), 5 deletions(-) --- base-commit: a48fa7efaf1161c1c898931fe4c7f0070964233a change-id: 20230908-acl-fix-6f8f86930f32 Best regards, diff --git a/fs/init.c b/fs/init.c index 9684406a8416..157404bb7d19 100644 --- a/fs/init.c +++ b/fs/init.c @@ -153,7 +153,7 @@ int __init init_mknod(const char *filename, umode_t mode, unsigned int dev) if (IS_ERR(dentry)) return PTR_ERR(dentry); - if (!IS_POSIXACL(path.dentry->d_inode)) + if (!IS_NOUMASK(path.dentry->d_inode)) mode &= ~current_umask(); error = security_path_mknod(&path, dentry, mode, dev); if (!error) @@ -229,7 +229,7 @@ int __init init_mkdir(const char *pathname, umode_t mode) dentry = kern_path_create(AT_FDCWD, pathname, &path, LOOKUP_DIRECTORY); if (IS_ERR(dentry)) return PTR_ERR(dentry); - if (!IS_POSIXACL(path.dentry->d_inode)) + if (!IS_NOUMASK(path.dentry->d_inode)) mode &= ~current_umask(); error = security_path_mkdir(&path, dentry, mode); if (!error) diff --git a/fs/namei.c b/fs/namei.c index 567ee547492b..905fdfec5d26 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -3117,7 +3117,7 @@ EXPORT_SYMBOL(unlock_rename); */ static inline umode_t mode_strip_umask(const struct inode *dir, umode_t mode) { - if (!IS_POSIXACL(dir)) + if (!IS_NOUMASK(dir)) mode &= ~current_umask(); return mode; } diff --git a/fs/nfs/super.c b/fs/nfs/super.c index 0d6473cb00cb..81cd11c4db3d 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -1071,7 +1071,7 @@ static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx) sb->s_export_op = &nfs_export_ops; break; case 4: - sb->s_flags |= SB_POSIXACL; + sb->s_flags |= SB_NOUMASK; sb->s_time_gran = 1; sb->s_time_min = S64_MIN; sb->s_time_max = S64_MAX; diff --git a/include/linux/fs.h b/include/linux/fs.h index 4aeb3fa11927..51ad013ca716 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1119,13 +1119,14 @@ extern int send_sigurg(struct fown_struct *fown); #define SB_NOATIME BIT(10) /* Do not update access times. */ #define SB_NODIRATIME BIT(11) /* Do not update directory access times */ #define SB_SILENT BIT(15) -#define SB_POSIXACL BIT(16) /* VFS does not apply the umask */ +#define SB_POSIXACL BIT(16) /* POSIX ACLs are supported (implies NOUMASK) */ #define SB_INLINECRYPT BIT(17) /* Use blk-crypto for encrypted files */ #define SB_KERNMOUNT BIT(22) /* this is a kern_mount call */ #define SB_I_VERSION BIT(23) /* Update inode I_version field */ #define SB_LAZYTIME BIT(25) /* Update the on-disk [acm]times lazily */ /* These sb flags are internal to the kernel */ +#define SB_NOUMASK BIT(20) /* VFS does not apply the umask */ #define SB_DEAD BIT(21) #define SB_DYING BIT(24) #define SB_SUBMOUNT BIT(26) @@ -2111,6 +2112,7 @@ static inline bool sb_rdonly(const struct super_block *sb) { return sb->s_flags #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) #define IS_POSIXACL(inode) __IS_FLG(inode, SB_POSIXACL) +#define IS_NOUMASK(inode) __IS_FLG(inode, SB_POSIXACL|SB_NOUMASK) #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)