linux-kernel - [PATCH 15/19] CacheFiles: Get the SID under which the CacheFiles module should operate

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Message-Id: <20061114200654.12943.1073.stgit@warthog.cambridge.redhat.com>
Date:	Tue, 14 Nov 2006 20:06:54 +0000
From:	David Howells <dhowells@...hat.com>
To:	torvalds@...l.org, akpm@...l.org, sds@...ho.nsa.gov,
	trond.myklebust@....uio.no
Cc:	dhowells@...hat.com, selinux@...ho.nsa.gov,
	linux-kernel@...r.kernel.org, aviro@...hat.com, steved@...hat.com
Subject: [PATCH 15/19] CacheFiles: Get the SID under which the CacheFiles module should operate

Get the SID under which the CacheFiles module should operate so that the
SELinux security system can control the accesses it makes.

Signed-Off-By: David Howells <dhowells@...hat.com>
---

 include/linux/security.h |   20 ++++++++++++++++++++
 security/dummy.c         |    7 +++++++
 security/selinux/hooks.c |    7 +++++++
 3 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/include/linux/security.h b/include/linux/security.h
index 5913ae7..8cfeefc 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1171,6 +1171,14 @@ #ifdef CONFIG_SECURITY
  *      owning security ID, and return the security ID as which the process was
  *      previously acting.
  *
+ * @cachefiles_get_secid:
+ *	Determine the security ID for the CacheFiles module to use when
+ *	accessing the filesystem containing the cache.
+ *	@secid contains the security ID under which cachefiles daemon is
+ *      running.
+ *	@modsecid contains the pointer to where the security ID for the module
+ *	is to be stored.
+ *
  * This is the main security structure.
  */
 struct security_operations {
@@ -1358,6 +1366,7 @@ struct security_operations {
 	u32 (*set_fscreate_secid)(u32 secid);
 	u32 (*act_as_secid)(u32 secid);
 	u32 (*act_as_self)(void);
+	int (*cachefiles_get_secid)(u32 secid, u32 *modsecid);
 
 #ifdef CONFIG_SECURITY_NETWORK
 	int (*unix_stream_connect) (struct socket * sock,
@@ -2180,6 +2189,11 @@ static inline u32 security_act_as_self(v
 	return security_ops->act_as_self();
 }
 
+static inline int security_cachefiles_get_secid(u32 secid, u32 *modsecid)
+{
+	return security_ops->cachefiles_get_secid(secid, modsecid);
+}
+
 /* prototypes */
 extern int security_init	(void);
 extern int register_security	(struct security_operations *ops);
@@ -2885,6 +2899,12 @@ static inline u32 security_act_as_self(v
 	return 0;
 }
 
+static inline int security_cachefiles_get_secid(u32 secid, u32 *modsecid)
+{
+	*modsecid = 0;
+	return 0;
+}
+
 #endif	/* CONFIG_SECURITY */
 
 #ifdef CONFIG_SECURITY_NETWORK
diff --git a/security/dummy.c b/security/dummy.c
index 3401ea3..30096ec 100644
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -952,6 +952,12 @@ static u32 dummy_act_as_self(void)
 	return 0;
 }
 
+static int dummy_cachefiles_get_secid(u32 secid, u32 *modsecid)
+{
+	*modsecid = 0;
+	return 0;
+}
+
 #ifdef CONFIG_KEYS
 static inline int dummy_key_alloc(struct key *key, struct task_struct *ctx,
 				  unsigned long flags)
@@ -1111,6 +1117,7 @@ void security_fixup_ops (struct security
  	set_to_dummy_if_null(ops, set_fscreate_secid);
  	set_to_dummy_if_null(ops, act_as_secid);
  	set_to_dummy_if_null(ops, act_as_self);
+ 	set_to_dummy_if_null(ops, cachefiles_get_secid);
 #ifdef CONFIG_SECURITY_NETWORK
 	set_to_dummy_if_null(ops, unix_stream_connect);
 	set_to_dummy_if_null(ops, unix_may_send);
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index ddac1bc..3a52698 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -4586,6 +4586,12 @@ static u32 selinux_act_as_self(void)
 	return oldactor_sid;
 }
 
+static int selinux_cachefiles_get_secid(u32 secid, u32 *modsecid)
+{
+	return security_transition_sid(secid, SECINITSID_KERNEL,
+				       SECCLASS_PROCESS, modsecid);
+}
+
 #ifdef CONFIG_KEYS
 
 static int selinux_key_alloc(struct key *k, struct task_struct *tsk,
@@ -4773,6 +4779,7 @@ static struct security_operations selinu
 	.set_fscreate_secid =		selinux_set_fscreate_secid,
 	.act_as_secid =			selinux_act_as_secid,
 	.act_as_self =			selinux_act_as_self,
+	.cachefiles_get_secid =		selinux_cachefiles_get_secid,
 
         .unix_stream_connect =		selinux_socket_unix_stream_connect,
 	.unix_may_send =		selinux_socket_unix_may_send,
-
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