lsm: remove lsm_prop scaffolding

Remove the scaffold member from the lsm_prop. Remove the
remaining places it is being set.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
[PM: subj line tweak]
Signed-off-by: Paul Moore <paul@paul-moore.com>

include/linux/security.h

@@ -156,11 +156,6 @@ enum lockdown_reason {
 	LOCKDOWN_CONFIDENTIALITY_MAX,
 };
 
-/* scaffolding */
-struct lsm_prop_scaffold {
-	u32 secid;
-};
-
 /*
  * Data exported by the security modules
  */
@@ -169,7 +164,6 @@ struct lsm_prop {
 	struct lsm_prop_smack smack;
 	struct lsm_prop_apparmor apparmor;
 	struct lsm_prop_bpf bpf;
-	struct lsm_prop_scaffold scaffold;
 };
 
 extern const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1];

security/apparmor/audit.c

@@ -270,11 +270,7 @@ int aa_audit_rule_match(struct lsm_prop *prop, u32 field, u32 op, void *vrule)
 	struct aa_label *label;
 	int found = 0;
 
-	/* scaffolding */
+	label = prop->apparmor.label;
-	if (!prop->apparmor.label && prop->scaffold.secid)
-		label = aa_secid_to_label(prop->scaffold.secid);
-	else
-		label = prop->apparmor.label;
 
 	if (!label)
 		return -ENOENT;

security/apparmor/lsm.c

@@ -987,8 +987,6 @@ static void apparmor_current_getlsmprop_subj(struct lsm_prop *prop)
 	struct aa_label *label = __begin_current_label_crit_section();
 
 	prop->apparmor.label = label;
-	/* scaffolding */
-	prop->scaffold.secid = label->secid;
 	__end_current_label_crit_section(label);
 }
 
@@ -998,8 +996,6 @@ static void apparmor_task_getlsmprop_obj(struct task_struct *p,
 	struct aa_label *label = aa_get_task_label(p);
 
 	prop->apparmor.label = label;
-	/* scaffolding */
-	prop->scaffold.secid = label->secid;
 	aa_put_label(label);
 }
 

security/apparmor/secid.c

@@ -102,11 +102,7 @@ int apparmor_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata,
 {
 	struct aa_label *label;
 
-	/* scaffolding */
+	label = prop->apparmor.label;
-	if (!prop->apparmor.label && prop->scaffold.secid)
-		label = aa_secid_to_label(prop->scaffold.secid);
-	else
-		label = prop->apparmor.label;
 
 	return apparmor_label_to_secctx(label, secdata, seclen);
 }

security/selinux/hooks.c

@@ -3508,8 +3508,6 @@ static void selinux_inode_getlsmprop(struct inode *inode, struct lsm_prop *prop)
 	struct inode_security_struct *isec = inode_security_novalidate(inode);
 
 	prop->selinux.secid = isec->sid;
-	/* scaffolding */
-	prop->scaffold.secid = isec->sid;
 }
 
 static int selinux_inode_copy_up(struct dentry *src, struct cred **new)
@@ -4040,8 +4038,6 @@ static void selinux_cred_getsecid(const struct cred *c, u32 *secid)
 static void selinux_cred_getlsmprop(const struct cred *c, struct lsm_prop *prop)
 {
 	prop->selinux.secid = cred_sid(c);
-	/* scaffolding */
-	prop->scaffold.secid = prop->selinux.secid;
 }
 
 /*
@@ -4182,16 +4178,12 @@ static int selinux_task_getsid(struct task_struct *p)
 static void selinux_current_getlsmprop_subj(struct lsm_prop *prop)
 {
 	prop->selinux.secid = current_sid();
-	/* scaffolding */
-	prop->scaffold.secid = prop->selinux.secid;
 }
 
 static void selinux_task_getlsmprop_obj(struct task_struct *p,
 					struct lsm_prop *prop)
 {
 	prop->selinux.secid = task_sid_obj(p);
-	/* scaffolding */
-	prop->scaffold.secid = prop->selinux.secid;
 }
 
 static int selinux_task_setnice(struct task_struct *p, int nice)
@@ -6339,8 +6331,6 @@ static void selinux_ipc_getlsmprop(struct kern_ipc_perm *ipcp,
 {
 	struct ipc_security_struct *isec = selinux_ipc(ipcp);
 	prop->selinux.secid = isec->sid;
-	/* scaffolding */
-	prop->scaffold.secid = isec->sid;
 }
 
 static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode)
@@ -6625,13 +6615,7 @@ static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
 static int selinux_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata,
 				     u32 *seclen)
 {
-	u32 secid = prop->selinux.secid;
+	return selinux_secid_to_secctx(prop->selinux.secid, secdata, seclen);
-
-	/* scaffolding */
-	if (!secid)
-		secid = prop->scaffold.secid;
-
-	return selinux_secid_to_secctx(secid, secdata, seclen);
 }
 
 static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)

security/selinux/ss/services.c

@@ -3661,10 +3661,6 @@ int selinux_audit_rule_match(struct lsm_prop *prop, u32 field, u32 op, void *vru
 		goto out;
 	}
 
-	/* scaffolding */
-	if (!prop->selinux.secid && prop->scaffold.secid)
-		prop->selinux.secid = prop->scaffold.secid;
-
 	ctxt = sidtab_search(policy->sidtab, prop->selinux.secid);
 	if (unlikely(!ctxt)) {
 		WARN_ONCE(1, "selinux_audit_rule_match: unrecognized SID %d\n",

security/smack/smack_lsm.c

@@ -1655,11 +1655,7 @@ static int smack_inode_listsecurity(struct inode *inode, char *buffer,
  */
 static void smack_inode_getlsmprop(struct inode *inode, struct lsm_prop *prop)
 {
-	struct smack_known *skp = smk_of_inode(inode);
+	prop->smack.skp = smk_of_inode(inode);
-
-	prop->smack.skp = skp;
-	/* scaffolding */
-	prop->scaffold.secid = skp->smk_secid;
 }
 
 /*
@@ -2162,8 +2158,6 @@ static void smack_cred_getlsmprop(const struct cred *cred,
 {
 	rcu_read_lock();
 	prop->smack.skp = smk_of_task(smack_cred(cred));
-	/* scaffolding */
-	prop->scaffold.secid = prop->smack.skp->smk_secid;
 	rcu_read_unlock();
 }
 
@@ -2265,11 +2259,7 @@ static int smack_task_getsid(struct task_struct *p)
  */
 static void smack_current_getlsmprop_subj(struct lsm_prop *prop)
 {
-	struct smack_known *skp = smk_of_current();
+	prop->smack.skp = smk_of_current();
-
-	prop->smack.skp = skp;
-	/* scaffolding */
-	prop->scaffold.secid = skp->smk_secid;
 }
 
 /**
@@ -2282,11 +2272,7 @@ static void smack_current_getlsmprop_subj(struct lsm_prop *prop)
 static void smack_task_getlsmprop_obj(struct task_struct *p,
 				      struct lsm_prop *prop)
 {
-	struct smack_known *skp = smk_of_task_struct_obj(p);
+	prop->smack.skp = smk_of_task_struct_obj(p);
-
-	prop->smack.skp = skp;
-	/* scaffolding */
-	prop->scaffold.secid = skp->smk_secid;
 }
 
 /**
@@ -3466,11 +3452,8 @@ static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
 static void smack_ipc_getlsmprop(struct kern_ipc_perm *ipp, struct lsm_prop *prop)
 {
 	struct smack_known **iskpp = smack_ipc(ipp);
-	struct smack_known *iskp = *iskpp;
 
-	prop->smack.skp = iskp;
+	prop->smack.skp = *iskpp;
-	/* scaffolding */
-	prop->scaffold.secid = iskp->smk_secid;
 }
 
 /**
@@ -4805,10 +4788,6 @@ static int smack_audit_rule_match(struct lsm_prop *prop, u32 field, u32 op,
 	if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
 		return 0;
 
-	/* scaffolding */
-	if (!skp && prop->scaffold.secid)
-		skp = smack_from_secid(prop->scaffold.secid);
-
 	/*
 	 * No need to do string comparisons. If a match occurs,
 	 * both pointers will point to the same smack_known
@@ -4869,10 +4848,6 @@ static int smack_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata,
 {
 	struct smack_known *skp = prop->smack.skp;
 
-	/* scaffolding */
-	if (!skp && prop->scaffold.secid)
-		skp = smack_from_secid(prop->scaffold.secid);
-
 	if (secdata)
 		*secdata = skp->smk_known;
 	*seclen = strlen(skp->smk_known);