linux-kernel - [PATCH v4 12/16] securityfs: Extend securityfs with namespacing support

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Date:   Tue,  7 Dec 2021 15:21:23 -0500
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     linux-integrity@...r.kernel.org
Cc:     zohar@...ux.ibm.com, serge@...lyn.com,
        christian.brauner@...ntu.com, containers@...ts.linux.dev,
        dmitry.kasatkin@...il.com, ebiederm@...ssion.com,
        krzysztof.struczynski@...wei.com, roberto.sassu@...wei.com,
        mpeters@...hat.com, lhinds@...hat.com, lsturman@...hat.com,
        puiterwi@...hat.com, jejb@...ux.ibm.com, jamjoom@...ibm.com,
        linux-kernel@...r.kernel.org, paul@...l-moore.com, rgb@...hat.com,
        linux-security-module@...r.kernel.org, jmorris@...ei.org,
        Stefan Berger <stefanb@...ux.ibm.com>,
        James Bottomley <James.Bottomley@...senPartnership.com>
Subject: [PATCH v4 12/16] securityfs: Extend securityfs with namespacing support

Extend 'securityfs' for support of IMA namespacing so that each
IMA (user) namespace can have its own front-end for showing the currently
active policy, the measurement list, number of violations and so on.

Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@...senPartnership.com>
---
 security/inode.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/security/inode.c b/security/inode.c
index 1a720b2c566d..121ac1874dde 100644
--- a/security/inode.c
+++ b/security/inode.c
@@ -54,7 +54,7 @@ static int securityfs_fill_super(struct super_block *sb, struct fs_context *fc)
 
 static int securityfs_get_tree(struct fs_context *fc)
 {
-	return get_tree_single(fc, securityfs_fill_super);
+	return get_tree_keyed(fc, securityfs_fill_super, fc->user_ns);
 }
 
 static const struct fs_context_operations securityfs_context_ops = {
@@ -67,11 +67,17 @@ static int securityfs_init_fs_context(struct fs_context *fc)
 	return 0;
 }
 
+static void securityfs_kill_super(struct super_block *sb)
+{
+	kill_litter_super(sb);
+}
+
 static struct file_system_type fs_type = {
 	.owner =	THIS_MODULE,
 	.name =		"securityfs",
 	.init_fs_context = securityfs_init_fs_context,
-	.kill_sb =	kill_litter_super,
+	.kill_sb =	securityfs_kill_super,
+	.fs_flags =	FS_USERNS_MOUNT,
 };
 
 /**
@@ -130,6 +136,8 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode,
 	if (!parent) {
 		if (ns == &init_user_ns)
 			parent = securityfs_mount->mnt_root;
+		else
+			return ERR_PTR(-EINVAL);
 	}
 
 	dir = d_inode(parent);
-- 
2.31.1