linux-kernel - [PATCH v5 2/2] selinux: expose policy brief via selinuxfs

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Date:   Tue, 16 May 2017 18:51:21 +0900
From:   Sebastien Buisson <sbuisson.ddn@...il.com>
To:     linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, selinux@...ho.nsa.gov
Cc:     serge@...lyn.com, james.l.morris@...cle.com, eparis@...isplace.org,
        sds@...ho.nsa.gov, paul@...l-moore.com,
        Sebastien Buisson <sbuisson@....com>
Subject: [PATCH v5 2/2] selinux: expose policy brief via selinuxfs

Expose policy brief via selinuxfs.

Signed-off-by: Sebastien Buisson <sbuisson@....com>
---
 security/selinux/selinuxfs.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index e8fe914..2561f96 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -99,6 +99,7 @@ enum sel_inos {
 	SEL_STATUS,	/* export current status using mmap() */
 	SEL_POLICY,	/* allow userspace to read the in kernel policy */
 	SEL_VALIDATE_TRANS, /* compute validatetrans decision */
+	SEL_POLICYBRIEF,/* return policy summary */
 	SEL_INO_NEXT,	/* The next inode number to use */
 };
 
@@ -314,6 +315,29 @@ static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
 	.llseek		= generic_file_llseek,
 };
 
+static ssize_t sel_read_policybrief(struct file *filp, char __user *buf,
+				    size_t count, loff_t *ppos)
+{
+	char *tmpbuf;
+	size_t len;
+	ssize_t rc;
+
+	rc = security_policydb_brief(&tmpbuf, &len, true);
+	if (rc)
+		return rc;
+
+	rc = simple_read_from_buffer(buf, count, ppos, tmpbuf, len);
+
+	kfree(tmpbuf);
+
+	return rc;
+}
+
+static const struct file_operations sel_policybrief_ops = {
+	.read		= sel_read_policybrief,
+	.llseek		= generic_file_llseek,
+};
+
 /* declaration for sel_write_load */
 static int sel_make_bools(void);
 static int sel_make_classes(void);
@@ -1827,6 +1851,8 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent)
 		[SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
 		[SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
 					S_IWUGO},
+		[SEL_POLICYBRIEF] = {"policybrief", &sel_policybrief_ops,
+				     S_IRUGO},
 		/* last one */ {""}
 	};
 	ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
-- 
1.8.3.1