[v3,13/13] LSM: Remove lsm_prop scaffolding

Commit Message

Casey Schaufler Sept. 10, 2024, 6:41 p.m. UTC

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

Signed-off-by: Casey Schaufler <[e-mail]>
---
 include/linux/security.h       |  6 ------
 security/apparmor/audit.c      |  6 +-----
 security/apparmor/lsm.c        |  4 ----
 security/apparmor/secid.c      |  6 +-----
 security/selinux/hooks.c       | 18 +-----------------
 security/selinux/ss/services.c |  4 ----
 security/smack/smack_lsm.c     | 33 ++++-----------------------------
 7 files changed, 7 insertions(+), 70 deletions(-)

Patch

diff --git a/include/linux/security.h b/include/linux/security.h
index ed13cf5bbe1f..86610ae0a9d2 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -144,11 +144,6 @@  enum lockdown_reason {
 	LOCKDOWN_CONFIDENTIALITY_MAX,
 };
 
-/* scaffolding */
-struct lsm_prop_scaffold {
-	u32 secid;
-};
-
 /*
  * Data exported by the security modules
  */
@@ -157,7 +152,6 @@  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];
diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c
index 87df6fa2a48d..73087d76f649 100644
--- a/security/apparmor/audit.c
+++ b/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 */
-	if (!prop->apparmor.label && prop->scaffold.secid)
-		label = aa_secid_to_label(prop->scaffold.secid);
-	else
-		label = prop->apparmor.label;
+	label = prop->apparmor.label;
 
 	if (!label)
 		return -ENOENT;
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 824a85d2ee85..e2e83519d5c3 100644
--- a/security/apparmor/lsm.c
+++ b/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);
 }
 
diff --git a/security/apparmor/secid.c b/security/apparmor/secid.c
index 34610888559f..6350d107013a 100644
--- a/security/apparmor/secid.c
+++ b/security/apparmor/secid.c
@@ -102,11 +102,7 @@  int apparmor_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata,
 {
 	struct aa_label *label;
 
-	/* scaffolding */
-	if (!prop->apparmor.label && prop->scaffold.secid)
-		label = aa_secid_to_label(prop->scaffold.secid);
-	else
-		label = prop->apparmor.label;
+	label = prop->apparmor.label;
 
 	return apparmor_label_to_secctx(label, secdata, seclen);
 }
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index a523f38faca0..3177d39faf79 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3510,8 +3510,6 @@  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)
@@ -4032,8 +4030,6 @@  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;
 }
 
 /*
@@ -4174,16 +4170,12 @@  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)
@@ -6348,8 +6340,6 @@  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)
@@ -6634,13 +6624,7 @@  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;
-
-	/* scaffolding */
-	if (!secid)
-		secid = prop->scaffold.secid;
-
-	return selinux_secid_to_secctx(secid, secdata, seclen);
+	return selinux_secid_to_secctx(prop->selinux.secid, secdata, seclen);
 }
 
 static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 74b1aafda399..14c583d171fc 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -3659,10 +3659,6 @@  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",
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 4d236a5ea5c6..e5b47342c274 100644
--- a/security/smack/smack_lsm.c
+++ b/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 = skp;
-	/* scaffolding */
-	prop->scaffold.secid = skp->smk_secid;
+	prop->smack.skp = smk_of_inode(inode);
 }
 
 /*
@@ -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 = skp;
-	/* scaffolding */
-	prop->scaffold.secid = skp->smk_secid;
+	prop->smack.skp = smk_of_current();
 }
 
 /**
@@ -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 = skp;
-	/* scaffolding */
-	prop->scaffold.secid = skp->smk_secid;
+	prop->smack.skp = smk_of_task_struct_obj(p);
 }
 
 /**
@@ -3473,11 +3459,8 @@  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;
-	/* scaffolding */
-	prop->scaffold.secid = iskp->smk_secid;
+	prop->smack.skp = *iskpp;
 }
 
 /**
@@ -4824,10 +4807,6 @@  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
@@ -4888,10 +4867,6 @@  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);