[PATCH v6 2/2] selinux: expose policy brief via selinuxfs

[Sebastien Buisson]

Expose policy brief via selinuxfs.

Signed-off-by: Sebastien Buisson <sbuis...@ddn.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