[PATCH 08/27] Add a secctx_to_secid() LSM hook to go along with the existing [try #2]

[David Howells <dhowells@xxxxxxxxxx>]

secid_to_secctx() LSM hook.  This patch also includes the SELinux
implementation for this hook.

Signed-off-by: Paul Moore <paul.moore@xxxxxx>
Acked-by: Stephen Smalley <sds@xxxxxxxxxxxxx>
---

 include/linux/security.h |   13 +++++++++++++
 security/dummy.c         |    6 ++++++
 security/security.c      |    6 ++++++
 security/selinux/hooks.c |    6 ++++++
 4 files changed, 31 insertions(+), 0 deletions(-)


diff --git a/include/linux/security.h b/include/linux/security.h
index b7ba073..e8f2f2d 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1200,6 +1200,10 @@ struct request_sock;
  *	Convert secid to security context.
  *	@secid contains the security ID.
  *	@secdata contains the pointer that stores the converted security context.
+ * @secctx_to_secid:
+ *      Convert security context to secid.
+ *      @secid contains the pointer to the generated security ID.
+ *      @secdata contains the security context.
  *
  * @release_secctx:
  *	Release the security context.
@@ -1389,6 +1393,7 @@ struct security_operations {
  	int (*getprocattr)(struct task_struct *p, char *name, char **value);
  	int (*setprocattr)(struct task_struct *p, char *name, void *value, size_t size);
 	int (*secid_to_secctx)(u32 secid, char **secdata, u32 *seclen);
+	int (*secctx_to_secid)(char *secdata, u32 seclen, u32 *secid);
 	void (*release_secctx)(char *secdata, u32 seclen);
 
 #ifdef CONFIG_SECURITY_NETWORK
@@ -1623,6 +1628,7 @@ int security_setprocattr(struct task_struct *p, char *name, void *value, size_t
 int security_netlink_send(struct sock *sk, struct sk_buff *skb);
 int security_netlink_recv(struct sk_buff *skb, int cap);
 int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen);
+int security_secctx_to_secid(char *secdata, u32 seclen, u32 *secid);
 void security_release_secctx(char *secdata, u32 seclen);
 
 #else /* CONFIG_SECURITY */
@@ -2305,6 +2311,13 @@ static inline int security_secid_to_secctx(u32 secid, char **secdata, u32 *secle
 	return -EOPNOTSUPP;
 }
 
+static inline int security_secctx_to_secid(char *secdata,
+					   u32 seclen,
+					   u32 *secid)
+{
+	return -EOPNOTSUPP;
+}
+
 static inline void security_release_secctx(char *secdata, u32 seclen)
 {
 }
diff --git a/security/dummy.c b/security/dummy.c
index 6f97089..72f1666 100644
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -943,6 +943,11 @@ static int dummy_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
 	return -EOPNOTSUPP;
 }
 
+static int dummy_secctx_to_secid(char *secdata, u32 seclen, u32 *secid)
+{
+	return -EOPNOTSUPP;
+}
+
 static void dummy_release_secctx(char *secdata, u32 seclen)
 {
 }
@@ -1109,6 +1114,7 @@ void security_fixup_ops (struct security_operations *ops)
  	set_to_dummy_if_null(ops, getprocattr);
  	set_to_dummy_if_null(ops, setprocattr);
  	set_to_dummy_if_null(ops, secid_to_secctx);
+	set_to_dummy_if_null(ops, secctx_to_secid);
  	set_to_dummy_if_null(ops, release_secctx);
 #ifdef CONFIG_SECURITY_NETWORK
 	set_to_dummy_if_null(ops, unix_stream_connect);
diff --git a/security/security.c b/security/security.c
index 92d66d6..1ef4908 100644
--- a/security/security.c
+++ b/security/security.c
@@ -821,6 +821,12 @@ int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
 }
 EXPORT_SYMBOL(security_secid_to_secctx);
 
+int security_secctx_to_secid(char *secdata, u32 seclen, u32 *secid)
+{
+	return security_ops->secctx_to_secid(secdata, seclen, secid);
+}
+EXPORT_SYMBOL(security_secctx_to_secid);
+
 void security_release_secctx(char *secdata, u32 seclen)
 {
 	return security_ops->release_secctx(secdata, seclen);
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 20a6b55..1d3eab7 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -4734,6 +4734,11 @@ static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
 	return security_sid_to_context(secid, secdata, seclen);
 }
 
+static int selinux_secctx_to_secid(char *secdata, u32 seclen, u32 *secid)
+{
+	return security_context_to_sid(secdata, seclen, secid);
+}
+
 static void selinux_release_secctx(char *secdata, u32 seclen)
 {
 	kfree(secdata);
@@ -4937,6 +4942,7 @@ static struct security_operations selinux_ops = {
 	.setprocattr =                  selinux_setprocattr,
 
 	.secid_to_secctx =		selinux_secid_to_secctx,
+	.secctx_to_secid =		selinux_secctx_to_secid,
 	.release_secctx =		selinux_release_secctx,
 
         .unix_stream_connect =		selinux_socket_unix_stream_connect,

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