linux-kernel - [RFC PATCH v2 02/14] vfs: Remove explicit devcgroup

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Message-Id: <20231018105033.13669-3-michael.weiss@aisec.fraunhofer.de>
Date:   Wed, 18 Oct 2023 12:50:21 +0200
From:   Michael Weiß <michael.weiss@...ec.fraunhofer.de>
To:     Alexander Mikhalitsyn <alexander@...alicyn.com>,
        Christian Brauner <brauner@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Paul Moore <paul@...l-moore.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Quentin Monnet <quentin@...valent.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Miklos Szeredi <miklos@...redi.hu>,
        Amir Goldstein <amir73il@...il.com>,
        "Serge E. Hallyn" <serge@...lyn.com>, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        gyroidos@...ec.fraunhofer.de,
        Michael Weiß <michael.weiss@...ec.fraunhofer.de>
Subject: [RFC PATCH v2 02/14] vfs: Remove explicit devcgroup_inode calls

Since the new lsm-based cgroup device access control is settled,
the explicit calls to devcgroup_inode_permission and
devcgroup_inode_mknod in fs/namei.c are redundant and can safely
be dropped. The corresponding security_inode_permission and
security_inode_mknod hooks are taking over.

Signed-off-by: Michael Weiß <michael.weiss@...ec.fraunhofer.de>
---
 fs/namei.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 567ee547492b..f601fcbdc4d2 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -34,7 +34,6 @@
 #include <linux/capability.h>
 #include <linux/file.h>
 #include <linux/fcntl.h>
-#include <linux/device_cgroup.h>
 #include <linux/fs_struct.h>
 #include <linux/posix_acl.h>
 #include <linux/hash.h>
@@ -529,10 +528,6 @@ int inode_permission(struct mnt_idmap *idmap,
 	if (retval)
 		return retval;
 
-	retval = devcgroup_inode_permission(inode, mask);
-	if (retval)
-		return retval;
-
 	return security_inode_permission(inode, mask);
 }
 EXPORT_SYMBOL(inode_permission);
@@ -3987,9 +3982,6 @@ int vfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
 		return -EPERM;
 
 	mode = vfs_prepare_mode(idmap, dir, mode, mode, mode);
-	error = devcgroup_inode_mknod(mode, dev);
-	if (error)
-		return error;
 
 	error = security_inode_mknod(dir, dentry, mode, dev);
 	if (error)
-- 
2.30.2