[PATCH 47/97] LSM: Use lsm_context in inode_notifysecctx hooks

From: Casey Schaufler <casey@schaufler-ca.com>
To: jmorris@namei.org, linux-security-module@vger.kernel.org,
	selinux@vger.kernel.org
Cc: keescook@chromium.org, john.johansen@canonical.com,
	penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com
Subject: [PATCH 47/97] LSM: Use lsm_context in inode_notifysecctx hooks
Date: Thu, 28 Feb 2019 14:18:43 -0800	[thread overview]
Message-ID: <20190228221933.2551-48-casey@schaufler-ca.com> (raw)
In-Reply-To: <20190228221933.2551-1-casey@schaufler-ca.com>

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@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 713378bdd69a..a7a68be7e507 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1367,8 +1367,7 @@
  *	Must be called with inode->i_mutex locked.
  *
  *	@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_setsecctx:
  *	Change the security context of an inode.  Updates the
@@ -1658,7 +1657,7 @@ union security_list_options {
 	void (*release_secctx)(char *secdata, u32 seclen);
 
 	void (*inode_invalidate_secctx)(struct inode *inode);
-	int (*inode_notifysecctx)(struct inode *inode, void *ctx, u32 ctxlen);
+	int (*inode_notifysecctx)(struct inode *inode, struct lsm_context *cp);
 	int (*inode_setsecctx)(struct dentry *dentry, void *ctx, u32 ctxlen);
 	int (*inode_getsecctx)(struct inode *inode, struct lsm_context *cp);
 
diff --git a/security/security.c b/security/security.c
index b2aa50a583c7..a0c4ae7da840 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2014,7 +2014,11 @@ EXPORT_SYMBOL(security_inode_invalidate_secctx);
 
 int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
 {
-	return call_int_hook(inode_notifysecctx, 0, inode, ctx, ctxlen);
+	struct lsm_context lc;
+
+	lc.context = ctx;
+	lc.len = ctxlen;
+	return call_int_hook(inode_notifysecctx, 0, inode, &lc);
 }
 EXPORT_SYMBOL(security_inode_notifysecctx);
 
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index a67b8a3e6b9c..33e58efe59ce 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -6232,9 +6232,11 @@ static void selinux_inode_invalidate_secctx(struct inode *inode)
 /*
  *	called with inode->i_mutex locked
  */
-static int selinux_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
+static int selinux_inode_notifysecctx(struct inode *inode,
+				      struct lsm_context *cp)
 {
-	return selinux_inode_setsecurity(inode, XATTR_SELINUX_SUFFIX, ctx, ctxlen, 0);
+	return selinux_inode_setsecurity(inode, XATTR_SELINUX_SUFFIX,
+						cp->context, cp->len, 0);
 }
 
 /*
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index b3d4410696a6..26cf42ddba0e 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4389,9 +4389,10 @@ static void smack_release_secctx(char *secdata, u32 seclen)
 {
 }
 
-static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
+static int smack_inode_notifysecctx(struct inode *inode, struct lsm_context *cp)
 {
-	return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
+	return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, cp->context,
+				       cp->len, 0);
 }
 
 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
-- 
2.17.0

