[PATCH 51/58] LSM: Use lsm_context in inode_setsecctx hooks

[Casey Schaufler]

Convert SELinux and Smack 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  | 5 ++---
 security/security.c        | 6 +++++-
 security/selinux/hooks.c   | 6 ++++--
 security/smack/smack_lsm.c | 5 +++--
 4 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index d1235a3cd8e9..088985d10a69 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1383,8 +1383,7 @@
  *	operation.
  *	Must be called with inode->i_mutex locked.
  *	@dentry contains the inode we wish to set the security context of.
- *	@ctx contains the string which we wish to set in the inode.
- *	@ctxlen contains the length of @ctx.
+ *	@cp contains the string which we wish to set in the inode.
  *
  * @inode_getsecctx:
  *	On success, returns 0 and fills out @cp with the security
@@ -1661,7 +1660,7 @@ union security_list_options {
 
 	void (*inode_invalidate_secctx)(struct inode *inode);
 	int (*inode_notifysecctx)(struct inode *inode, struct lsm_context *cp);
-	int (*inode_setsecctx)(struct dentry *dentry, void *ctx, u32 ctxlen);
+	int (*inode_setsecctx)(struct dentry *dentry, struct lsm_context *cp);
 	int (*inode_getsecctx)(struct inode *inode, struct lsm_context *cp);
 
 #ifdef CONFIG_SECURITY_NETWORK
diff --git a/security/security.c b/security/security.c
index c8ce190dcdda..9d09c774a1e9 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2008,7 +2008,11 @@ EXPORT_SYMBOL(security_inode_notifysecctx);
 
 int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
 {
-	return call_int_hook(inode_setsecctx, 0, dentry, ctx, ctxlen);
+	struct lsm_context lc;
+
+	lc.context = ctx;
+	lc.len = ctxlen;
+	return call_int_hook(inode_setsecctx, 0, dentry, &lc);
 }
 EXPORT_SYMBOL(security_inode_setsecctx);
 
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 0e347a26c3d8..af0d98f4dd37 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -6356,9 +6356,11 @@ static int selinux_inode_notifysecctx(struct inode *inode,
 /*
  *	called with inode->i_mutex locked
  */
-static int selinux_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
+static int selinux_inode_setsecctx(struct dentry *dentry,
+				   struct lsm_context *cp)
 {
-	return __vfs_setxattr_noperm(dentry, XATTR_NAME_SELINUX, ctx, ctxlen, 0);
+	return __vfs_setxattr_noperm(dentry, XATTR_NAME_SELINUX, cp->context,
+				     cp->len, 0);
 }
 
 static int selinux_inode_getsecctx(struct inode *inode, struct lsm_context *cp)
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index e00346799cdf..4570e8cac1b3 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4480,9 +4480,10 @@ static int smack_inode_notifysecctx(struct inode *inode, struct lsm_context *cp)
 				       cp->len, 0);
 }
 
-static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
+static int smack_inode_setsecctx(struct dentry *dentry, struct lsm_context *cp)
 {
-	return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
+	return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, cp->context,
+				     cp->len, 0);
 }
 
 static int smack_inode_getsecctx(struct inode *inode, struct lsm_context *cp)
-- 
2.19.1