[v2,13/13] LSM: Remove lsmblob scaffolding

Commit Message

Casey Schaufler Aug. 30, 2024, 12:34 a.m. UTC

Remove the scaffold member from the lsmblob. 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 111c1fc18f25..ca4f3b41f344 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -144,11 +144,6 @@  enum lockdown_reason {
 	LOCKDOWN_CONFIDENTIALITY_MAX,
 };
 
-/* scaffolding */
-struct lsmblob_scaffold {
-	u32 secid;
-};
-
 /*
  * Data exported by the security modules
  */
@@ -157,7 +152,6 @@  struct lsmblob {
 	struct lsmblob_smack smack;
 	struct lsmblob_apparmor apparmor;
 	struct lsmblob_bpf bpf;
-	struct lsmblob_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 758b75a9c1c5..120154a6d683 100644
--- a/security/apparmor/audit.c
+++ b/security/apparmor/audit.c
@@ -270,11 +270,7 @@  int aa_audit_rule_match(struct lsmblob *blob, u32 field, u32 op, void *vrule)
 	struct aa_label *label;
 	int found = 0;
 
-	/* scaffolding */
-	if (!blob->apparmor.label && blob->scaffold.secid)
-		label = aa_secid_to_label(blob->scaffold.secid);
-	else
-		label = blob->apparmor.label;
+	label = blob->apparmor.label;
 
 	if (!label)
 		return -ENOENT;
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 877c4e809ae8..08fde302c9fe 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -987,8 +987,6 @@  static void apparmor_current_getlsmblob_subj(struct lsmblob *blob)
 	struct aa_label *label = __begin_current_label_crit_section();
 
 	blob->apparmor.label = label;
-	/* scaffolding */
-	blob->scaffold.secid = label->secid;
 	__end_current_label_crit_section(label);
 }
 
@@ -998,8 +996,6 @@  static void apparmor_task_getlsmblob_obj(struct task_struct *p,
 	struct aa_label *label = aa_get_task_label(p);
 
 	blob->apparmor.label = label;
-	/* scaffolding */
-	blob->scaffold.secid = label->secid;
 	aa_put_label(label);
 }
 
diff --git a/security/apparmor/secid.c b/security/apparmor/secid.c
index 7ba48d0b3ee8..301a98d7cc6f 100644
--- a/security/apparmor/secid.c
+++ b/security/apparmor/secid.c
@@ -102,11 +102,7 @@  int apparmor_lsmblob_to_secctx(struct lsmblob *blob, char **secdata,
 {
 	struct aa_label *label;
 
-	/* scaffolding */
-	if (!blob->apparmor.label && blob->scaffold.secid)
-		label = aa_secid_to_label(blob->scaffold.secid);
-	else
-		label = blob->apparmor.label;
+	label = blob->apparmor.label;
 
 	return apparmor_label_to_secctx(label, secdata, seclen);
 }
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 076511c446bd..a81529c21517 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3510,8 +3510,6 @@  static void selinux_inode_getlsmblob(struct inode *inode, struct lsmblob *blob)
 	struct inode_security_struct *isec = inode_security_novalidate(inode);
 
 	blob->selinux.secid = isec->sid;
-	/* scaffolding */
-	blob->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_getlsmblob(const struct cred *c, struct lsmblob *blob)
 {
 	blob->selinux.secid = cred_sid(c);
-	/* scaffolding */
-	blob->scaffold.secid = blob->selinux.secid;
 }
 
 /*
@@ -4174,16 +4170,12 @@  static int selinux_task_getsid(struct task_struct *p)
 static void selinux_current_getlsmblob_subj(struct lsmblob *blob)
 {
 	blob->selinux.secid = current_sid();
-	/* scaffolding */
-	blob->scaffold.secid = blob->selinux.secid;
 }
 
 static void selinux_task_getlsmblob_obj(struct task_struct *p,
 					struct lsmblob *blob)
 {
 	blob->selinux.secid = task_sid_obj(p);
-	/* scaffolding */
-	blob->scaffold.secid = blob->selinux.secid;
 }
 
 static int selinux_task_setnice(struct task_struct *p, int nice)
@@ -6348,8 +6340,6 @@  static void selinux_ipc_getlsmblob(struct kern_ipc_perm *ipcp,
 {
 	struct ipc_security_struct *isec = selinux_ipc(ipcp);
 	blob->selinux.secid = isec->sid;
-	/* scaffolding */
-	blob->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_lsmblob_to_secctx(struct lsmblob *blob, char **secdata,
 				     u32 *seclen)
 {
-	u32 secid = blob->selinux.secid;
-
-	/* scaffolding */
-	if (!secid)
-		secid = blob->scaffold.secid;
-
-	return security_sid_to_context(secid, secdata, seclen);
+	return security_sid_to_context(blob->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 43eb1d46942c..002072912800 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -3660,10 +3660,6 @@  int selinux_audit_rule_match(struct lsmblob *blob, u32 field, u32 op,
 		goto out;
 	}
 
-	/* scaffolding */
-	if (!blob->selinux.secid && blob->scaffold.secid)
-		blob->selinux.secid = blob->scaffold.secid;
-
 	ctxt = sidtab_search(policy->sidtab, blob->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 a2445e4f906d..f462051e683f 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_getlsmblob(struct inode *inode, struct lsmblob *blob)
 {
-	struct smack_known *skp = smk_of_inode(inode);
-
-	blob->smack.skp = skp;
-	/* scaffolding */
-	blob->scaffold.secid = skp->smk_secid;
+	blob->smack.skp = smk_of_inode(inode);
 }
 
 /*
@@ -2162,8 +2158,6 @@  static void smack_cred_getlsmblob(const struct cred *cred,
 {
 	rcu_read_lock();
 	blob->smack.skp = smk_of_task(smack_cred(cred));
-	/* scaffolding */
-	blob->scaffold.secid = blob->smack.skp->smk_secid;
 	rcu_read_unlock();
 }
 
@@ -2265,11 +2259,7 @@  static int smack_task_getsid(struct task_struct *p)
  */
 static void smack_current_getlsmblob_subj(struct lsmblob *blob)
 {
-	struct smack_known *skp = smk_of_current();
-
-	blob->smack.skp = skp;
-	/* scaffolding */
-	blob->scaffold.secid = skp->smk_secid;
+	blob->smack.skp = smk_of_current();
 }
 
 /**
@@ -2282,11 +2272,7 @@  static void smack_current_getlsmblob_subj(struct lsmblob *blob)
 static void smack_task_getlsmblob_obj(struct task_struct *p,
 				      struct lsmblob *blob)
 {
-	struct smack_known *skp = smk_of_task_struct_obj(p);
-
-	blob->smack.skp = skp;
-	/* scaffolding */
-	blob->scaffold.secid = skp->smk_secid;
+	blob->smack.skp = smk_of_task_struct_obj(p);
 }
 
 /**
@@ -3474,11 +3460,8 @@  static void smack_ipc_getlsmblob(struct kern_ipc_perm *ipp,
 				 struct lsmblob *blob)
 {
 	struct smack_known **iskpp = smack_ipc(ipp);
-	struct smack_known *iskp = *iskpp;
 
-	blob->smack.skp = iskp;
-	/* scaffolding */
-	blob->scaffold.secid = iskp->smk_secid;
+	blob->smack.skp = *iskpp;
 }
 
 /**
@@ -4825,10 +4808,6 @@  static int smack_audit_rule_match(struct lsmblob *blob, u32 field, u32 op,
 	if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
 		return 0;
 
-	/* scaffolding */
-	if (!skp && blob->scaffold.secid)
-		skp = smack_from_secid(blob->scaffold.secid);
-
 	/*
 	 * No need to do string comparisons. If a match occurs,
 	 * both pointers will point to the same smack_known
@@ -4889,10 +4868,6 @@  static int smack_lsmblob_to_secctx(struct lsmblob *blob, char **secdata,
 {
 	struct smack_known *skp = blob->smack.skp;
 
-	/* scaffolding */
-	if (!skp && blob->scaffold.secid)
-		skp = smack_from_secid(blob->scaffold.secid);
-
 	if (secdata)
 		*secdata = skp->smk_known;
 	*seclen = strlen(skp->smk_known);