[PATCH 42/58] LSM: Use lsm_context in security_dentry_init_security

[Casey Schaufler]

From: Casey Schaufler <cschaufler at schaufler-ca.com>

Convert security_dentry_init_security 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>
---
 fs/nfs/nfs4proc.c        |  5 ++++-
 include/linux/security.h |  7 +++----
 security/security.c      | 14 ++++----------
 3 files changed, 11 insertions(+), 15 deletions(-)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 4dbb0ee23432..de000649f9f3 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -113,6 +113,7 @@ static inline struct nfs4_label *
 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 	struct iattr *sattr, struct nfs4_label *label)
 {
+	struct lsm_context lc; /* Scaffolding -Casey */
 	int err;
 
 	if (label == NULL)
@@ -122,7 +123,9 @@ nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 		return NULL;
 
 	err = security_dentry_init_security(dentry, sattr->ia_mode,
-				&dentry->d_name, (void **)&label->label, &label->len);
+					    &dentry->d_name, &lc);
+	label->label = lc.context;
+	label->len = lc.len;
 	if (err == 0)
 		return label;
 
diff --git a/include/linux/security.h b/include/linux/security.h
index e12b169deed6..6c3a74a44a59 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -302,8 +302,8 @@ int security_sb_clone_mnt_opts(const struct super_block *oldsb,
 int security_add_mnt_opt(const char *option, const char *val,
 				int len, void **mnt_opts);
 int security_dentry_init_security(struct dentry *dentry, int mode,
-					const struct qstr *name, void **ctx,
-					u32 *ctxlen);
+					const struct qstr *name,
+					struct lsm_context *cp);
 int security_dentry_create_files_as(struct dentry *dentry, int mode,
 					struct qstr *name,
 					const struct cred *old,
@@ -674,8 +674,7 @@ static inline void security_inode_free(struct inode *inode)
 static inline int security_dentry_init_security(struct dentry *dentry,
 						 int mode,
 						 const struct qstr *name,
-						 void **ctx,
-						 u32 *ctxlen)
+						 struct lsm_context *cp)
 {
 	return -EOPNOTSUPP;
 }
diff --git a/security/security.c b/security/security.c
index c04b334370a5..628287180ce7 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1014,17 +1014,11 @@ void security_inode_free(struct inode *inode)
 }
 
 int security_dentry_init_security(struct dentry *dentry, int mode,
-					const struct qstr *name, void **ctx,
-					u32 *ctxlen)
+					const struct qstr *name,
+					struct lsm_context *cp)
 {
-	struct lsm_context lc = { .context = NULL, .len = 0, };
-	int rc;
-
-	rc = call_int_hook(dentry_init_security, -EOPNOTSUPP, dentry, mode,
-				name, &lc);
-	*ctx = (void *)lc.context;
-	*ctxlen = lc.len;
-	return rc;
+	return call_int_hook(dentry_init_security, -EOPNOTSUPP, dentry, mode,
+			     name, cp);
 }
 EXPORT_SYMBOL(security_dentry_init_security);
 
-- 
2.19.1