[PATCH 39/59] LSM: Use lsm_context in secctx_to_secid hooks

[Casey Schaufler]

Convert SELinux, Smack and AppArmor 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         | 4 ++--
 security/apparmor/include/secid.h | 2 +-
 security/apparmor/secid.c         | 7 +++----
 security/security.c               | 6 +++++-
 security/selinux/hooks.c          | 4 ++--
 security/smack/smack_lsm.c        | 4 ++--
 6 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 566714aa0caf..8b842fd13fb4 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1327,8 +1327,8 @@
  *	context.
  * @secctx_to_secid:
  *	Convert security context to exported lsm data.
+ *	@cp contains the security context.
  *	@l contains the pointer to the generated security data.
- *	@secdata contains the security context.
  *
  * @release_secctx:
  *	Release the security context.
@@ -1672,7 +1672,7 @@ union security_list_options {
 	int (*setprocattr)(const char *name, void *value, size_t size);
 	int (*ismaclabel)(const char *name);
 	int (*secid_to_secctx)(struct lsm_export *l, struct lsm_context *cp);
-	int (*secctx_to_secid)(const char *secdata, u32 seclen,
+	int (*secctx_to_secid)(const struct lsm_context *cp,
 				struct lsm_export *l);
 	void (*release_secctx)(char *secdata, u32 seclen);
 
diff --git a/security/apparmor/include/secid.h b/security/apparmor/include/secid.h
index 964d3dc92635..acfcf99bff0e 100644
--- a/security/apparmor/include/secid.h
+++ b/security/apparmor/include/secid.h
@@ -27,7 +27,7 @@ struct aa_label;
 
 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 char *secdata, u32 seclen,
+int apparmor_secctx_to_secid(const struct lsm_context *cp,
 			     struct lsm_export *l);
 void apparmor_release_secctx(char *secdata, u32 seclen);
 
diff --git a/security/apparmor/secid.c b/security/apparmor/secid.c
index 4e11434605d6..35df38592b6e 100644
--- a/security/apparmor/secid.c
+++ b/security/apparmor/secid.c
@@ -110,13 +110,12 @@ int apparmor_secid_to_secctx(struct lsm_export *l, struct lsm_context *cp)
 	return 0;
 }
 
-int apparmor_secctx_to_secid(const char *secdata, u32 seclen,
-			     struct lsm_export *l)
+int apparmor_secctx_to_secid(const struct lsm_context *cp, struct lsm_export *l)
 {
 	struct aa_label *label;
 
-	label = aa_label_strn_parse(&root_ns->unconfined->label, secdata,
-				    seclen, GFP_KERNEL, false, false);
+	label = aa_label_strn_parse(&root_ns->unconfined->label, cp->context,
+				    cp->len, GFP_KERNEL, false, false);
 	if (IS_ERR(label))
 		return PTR_ERR(label);
 	aa_export_secid(l, label->secid);
diff --git a/security/security.c b/security/security.c
index 7cf8e268a45c..f3788840019a 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2005,8 +2005,12 @@ EXPORT_SYMBOL(security_secid_to_secctx);
 int security_secctx_to_secid(const char *secdata, u32 seclen,
 			     struct lsm_export *l)
 {
+	struct lsm_context lc;
+
+	lc.context = secdata;
+	lc.len = seclen;
 	lsm_export_init(l);
-	return call_one_int_hook(secctx_to_secid, 0, secdata, seclen, l);
+	return call_one_int_hook(secctx_to_secid, 0, &lc, l);
 }
 EXPORT_SYMBOL(security_secctx_to_secid);
 
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 6a2a82dcd948..a2257ccaee5c 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -6310,13 +6310,13 @@ static int selinux_secid_to_secctx(struct lsm_export *l, struct lsm_context *cp)
 				       &cp->context, &cp->len);
 }
 
-static int selinux_secctx_to_secid(const char *secdata, u32 seclen,
+static int selinux_secctx_to_secid(const struct lsm_context *cp,
 				   struct lsm_export *l)
 {
 	u32 secid;
 	int rc;
 
-	rc = security_context_to_sid(&selinux_state, secdata, seclen,
+	rc = security_context_to_sid(&selinux_state, cp->context, cp->len,
 				     &secid, GFP_KERNEL);
 	selinux_export_secid(l, secid);
 	return rc;
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 10d6c6a1a001..78c01ef707eb 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4455,10 +4455,10 @@ static int smack_secid_to_secctx(struct lsm_export *l, struct lsm_context *cp)
  *
  * Exists for audit and networking code.
  */
-static int smack_secctx_to_secid(const char *secdata, u32 seclen,
+static int smack_secctx_to_secid(const struct lsm_context *cp,
 				 struct lsm_export *l)
 {
-	struct smack_known *skp = smk_find_entry(secdata);
+	struct smack_known *skp = smk_find_entry(cp->context);
 
 	if (skp)
 		smack_export_secid(l, skp->smk_secid);
-- 
2.19.1