[PATCH 47/59] LSM: Use lsm_context in release_secctx hooks

[Casey Schaufler]

Convert SELinux, Smack and AppAror to use the lsm_context structure
instead of a context/secid pair. There is some scaffolding involved
that will be removed when the related data is updated.

Signed-off-by: Casey Schaufler <casey at schaufler-ca.com>
---
 include/linux/lsm_hooks.h         | 3 +--
 security/apparmor/include/secid.h | 2 +-
 security/apparmor/secid.c         | 4 ++--
 security/security.c               | 7 +++++--
 security/selinux/hooks.c          | 4 ++--
 security/smack/smack_lsm.c        | 4 ++--
 6 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index f60ec98596c8..11bfa0a4f188 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1332,7 +1332,6 @@
  * @release_secctx:
  *	Release the security context.
  *	@secdata contains the security context.
- *	@seclen contains the length of the security context.
  *
  * Security hooks for Audit
  *
@@ -1671,7 +1670,7 @@ union security_list_options {
 	int (*secid_to_secctx)(struct lsm_export *l, struct lsm_context *cp);
 	int (*secctx_to_secid)(const struct lsm_context *cp,
 				struct lsm_export *l);
-	void (*release_secctx)(char *secdata, u32 seclen);
+	void (*release_secctx)(struct lsm_context *cp);
 
 	void (*inode_invalidate_secctx)(struct inode *inode);
 	int (*inode_notifysecctx)(struct inode *inode, struct lsm_context *cp);
diff --git a/security/apparmor/include/secid.h b/security/apparmor/include/secid.h
index acfcf99bff0e..a780e56d4f5b 100644
--- a/security/apparmor/include/secid.h
+++ b/security/apparmor/include/secid.h
@@ -29,7 +29,7 @@ struct aa_label *aa_secid_to_label(struct lsm_export *l);
 int apparmor_secid_to_secctx(struct lsm_export *l, struct lsm_context *cp);
 int apparmor_secctx_to_secid(const struct lsm_context *cp,
 			     struct lsm_export *l);
-void apparmor_release_secctx(char *secdata, u32 seclen);
+void apparmor_release_secctx(struct lsm_context *cp);
 
 
 int aa_alloc_secid(struct aa_label *label, gfp_t gfp);
diff --git a/security/apparmor/secid.c b/security/apparmor/secid.c
index 35df38592b6e..46c8b9a67ac7 100644
--- a/security/apparmor/secid.c
+++ b/security/apparmor/secid.c
@@ -123,9 +123,9 @@ int apparmor_secctx_to_secid(const struct lsm_context *cp, struct lsm_export *l)
 	return 0;
 }
 
-void apparmor_release_secctx(char *secdata, u32 seclen)
+void apparmor_release_secctx(struct lsm_context *cp)
 {
-	kfree(secdata);
+	kfree(cp->context);
 }
 
 /**
diff --git a/security/security.c b/security/security.c
index f51ea4a134ae..149cceb5e366 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2004,7 +2004,6 @@ EXPORT_SYMBOL(security_secid_to_secctx);
 
 int security_secctx_to_secid(struct lsm_context *cp, struct lsm_export *l)
 {
-
 	lsm_export_init(l);
 	return call_one_int_hook(secctx_to_secid, 0, cp, l);
 }
@@ -2012,7 +2011,11 @@ EXPORT_SYMBOL(security_secctx_to_secid);
 
 void security_release_secctx(char *secdata, u32 seclen)
 {
-	call_one_void_hook(release_secctx, secdata, seclen);
+	struct lsm_context lc;
+
+	lc.context = secdata;
+	lc.len = seclen;
+	call_one_void_hook(release_secctx, &lc);
 }
 EXPORT_SYMBOL(security_release_secctx);
 
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index fe09905d013c..332296f69f76 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -6322,9 +6322,9 @@ static int selinux_secctx_to_secid(const struct lsm_context *cp,
 	return rc;
 }
 
-static void selinux_release_secctx(char *secdata, u32 seclen)
+static void selinux_release_secctx(struct lsm_context *cp)
 {
-	kfree(secdata);
+	kfree(cp->context);
 }
 
 static void selinux_inode_invalidate_secctx(struct inode *inode)
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 3d24503029e5..cf27905ccaa5 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4468,9 +4468,9 @@ static int smack_secctx_to_secid(const struct lsm_context *cp,
 }
 
 /*
- * There smack_release_secctx hook does nothing
+ * The smack_release_secctx hook does nothing
  */
-static void smack_release_secctx(char *secdata, u32 seclen)
+static void smack_release_secctx(struct lsm_context *cp)
 {
 }
 
-- 
2.19.1