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From: Casey Schaufler <casey@schaufler-ca.com>
To: casey.schaufler@intel.com, jmorris@namei.org,
	linux-security-module@vger.kernel.org, selinux@vger.kernel.org
Cc: casey@schaufler-ca.com, keescook@chromium.org,
	john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp,
	paul@paul-moore.com, sds@tycho.nsa.gov
Subject: [PATCH v8 25/28] LSM: Provide an user space interface for the default display
Date: Thu, 29 Aug 2019 16:29:32 -0700
Message-ID: <20190829232935.7099-26-casey@schaufler-ca.com> (raw)
In-Reply-To: <20190829232935.7099-1-casey@schaufler-ca.com>

Create /sys/kernel/security/lsm_display_default which contains
the name of the security module used when no display value
has been set.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 security/inode.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/security/inode.c b/security/inode.c
index b7772a9b315e..538a4d6796da 100644
--- a/security/inode.c
+++ b/security/inode.c
@@ -321,6 +321,22 @@ static const struct file_operations lsm_ops = {
 	.read = lsm_read,
 	.llseek = generic_file_llseek,
 };
+
+static struct dentry *lsm_display_default_dentry;
+static ssize_t lsm_display_default_read(struct file *filp, char __user *buf,
+					size_t count, loff_t *ppos)
+{
+	const char *name = security_lsm_slot_name(0);
+
+	if (name == NULL)
+		return 0;
+	return simple_read_from_buffer(buf, count, ppos, name, strlen(name));
+}
+
+static const struct file_operations lsm_display_default_ops = {
+	.read = lsm_display_default_read,
+	.llseek = generic_file_llseek,
+};
 #endif
 
 static int __init securityfs_init(void)
@@ -337,8 +353,10 @@ static int __init securityfs_init(void)
 		return retval;
 	}
 #ifdef CONFIG_SECURITY
-	lsm_dentry = securityfs_create_file("lsm", 0444, NULL, NULL,
-						&lsm_ops);
+	lsm_dentry = securityfs_create_file("lsm", 0444, NULL, NULL, &lsm_ops);
+	lsm_display_default_dentry = securityfs_create_file(
+					"lsm_display_default", 0444, NULL,
+					NULL, &lsm_display_default_ops);
 #endif
 	return 0;
 }
-- 
2.20.1


  parent reply index

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-29 23:29 [PATCH v8 00/28] LSM: Module stacking for AppArmor Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 01/28] LSM: Infrastructure management of the superblock Casey Schaufler
2019-09-16 18:19   ` Stephen Smalley
2019-08-29 23:29 ` [PATCH v8 02/28] LSM: Infrastructure management of the sock security Casey Schaufler
2019-09-16 18:42   ` Stephen Smalley
2019-09-18  7:19     ` John Johansen
2019-08-29 23:29 ` [PATCH v8 03/28] LSM: Infrastructure management of the key blob Casey Schaufler
2019-09-16 18:47   ` Stephen Smalley
2019-08-29 23:29 ` [PATCH v8 04/28] LSM: Create and manage the lsmblob data structure Casey Schaufler
2019-09-16 19:15   ` Stephen Smalley
2019-09-23 15:56     ` Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 05/28] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 06/28] LSM: Use lsmblob in security_kernel_act_as Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 07/28] net: Prepare UDS for security module stacking Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 08/28] LSM: Use lsmblob in security_secctx_to_secid Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 09/28] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 10/28] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 11/28] LSM: Use lsmblob in security_task_getsecid Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 12/28] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 13/28] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 14/28] IMA: Change internal interfaces to use lsmblobs Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 15/28] LSM: Specify which LSM to display Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 16/28] LSM: Ensure the correct LSM context releaser Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 17/28] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 18/28] LSM: Use lsmcontext in security_dentry_init_security Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 19/28] LSM: Use lsmcontext in security_inode_getsecctx Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 20/28] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 21/28] NET: Store LSM netlabel data in a lsmblob Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 22/28] SELinux: Verify LSM display sanity in binder Casey Schaufler
2019-09-18 17:43   ` Stephen Smalley
2019-08-29 23:29 ` [PATCH v8 23/28] Audit: Add subj_LSM fields when necessary Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 24/28] Audit: Include object data for all security modules Casey Schaufler
2019-08-29 23:29 ` Casey Schaufler [this message]
2019-08-29 23:29 ` [PATCH v8 26/28] NET: Add SO_PEERCONTEXT for multiple LSMs Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 27/28] LSM: Add /proc attr entry for full LSM context Casey Schaufler
2019-08-29 23:29 ` [PATCH v8 28/28] AppArmor: Remove the exclusive flag Casey Schaufler
2019-09-04 19:13 ` [PATCH v8 00/28] LSM: Module stacking for AppArmor Casey Schaufler
2019-09-06 13:46   ` Stephen Smalley

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