selinux: stop passing selinux_state pointers and their offspring

Linus observed that the pervasive passing of selinux_state pointers
introduced by me in commit aa8e712cee93 ("selinux: wrap global selinux
state") adds overhead and complexity without providing any
benefit. The original idea was to pave the way for SELinux namespaces
but those have not yet been implemented and there isn't currently
a concrete plan to do so. Remove the passing of the selinux_state
pointers, reverting to direct use of the single global selinux_state,
and likewise remove passing of child pointers like the selinux_avc.
The selinux_policy pointer remains as it is needed for atomic switching
of policies.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202303101057.mZ3Gv5fK-lkp@intel.com/
Signed-off-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

1 files changed, 65 insertions, 106 deletions

diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h
index 393aff41d3ef..cb38d1894cfc 100644
--- a/security/selinux/include/security.h
+++ b/security/selinux/include/security.h
@@ -86,7 +86,6 @@ extern int selinux_enabled_boot;
 /* limitation of boundary depth  */
 #define POLICYDB_BOUNDS_MAXDEPTH	4
 
-struct selinux_avc;
 struct selinux_policy;
 
 struct selinux_state {
@@ -103,72 +102,71 @@ struct selinux_state {
 	struct page *status_page;
 	struct mutex status_lock;
 
-	struct selinux_avc *avc;
 	struct selinux_policy __rcu *policy;
 	struct mutex policy_mutex;
 } __randomize_layout;
 
-void selinux_avc_init(struct selinux_avc **avc);
+void selinux_avc_init(void);
 
 extern struct selinux_state selinux_state;
 
-static inline bool selinux_initialized(const struct selinux_state *state)
+static inline bool selinux_initialized(void)
 {
 	/* do a synchronized load to avoid race conditions */
-	return smp_load_acquire(&state->initialized);
+	return smp_load_acquire(&selinux_state.initialized);
 }
 
-static inline void selinux_mark_initialized(struct selinux_state *state)
+static inline void selinux_mark_initialized(void)
 {
 	/* do a synchronized write to avoid race conditions */
-	smp_store_release(&state->initialized, true);
+	smp_store_release(&selinux_state.initialized, true);
 }
 
 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
-static inline bool enforcing_enabled(struct selinux_state *state)
+static inline bool enforcing_enabled(void)
 {
-	return READ_ONCE(state->enforcing);
+	return READ_ONCE(selinux_state.enforcing);
 }
 
-static inline void enforcing_set(struct selinux_state *state, bool value)
+static inline void enforcing_set(bool value)
 {
-	WRITE_ONCE(state->enforcing, value);
+	WRITE_ONCE(selinux_state.enforcing, value);
 }
 #else
-static inline bool enforcing_enabled(struct selinux_state *state)
+static inline bool enforcing_enabled(void)
 {
 	return true;
 }
 
-static inline void enforcing_set(struct selinux_state *state, bool value)
+static inline void enforcing_set(bool value)
 {
 }
 #endif
 
-static inline bool checkreqprot_get(const struct selinux_state *state)
+static inline bool checkreqprot_get(void)
 {
-	return READ_ONCE(state->checkreqprot);
+	return READ_ONCE(selinux_state.checkreqprot);
 }
 
-static inline void checkreqprot_set(struct selinux_state *state, bool value)
+static inline void checkreqprot_set(bool value)
 {
 	if (value)
 		pr_err("SELinux: https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-checkreqprot\n");
-	WRITE_ONCE(state->checkreqprot, value);
+	WRITE_ONCE(selinux_state.checkreqprot, value);
 }
 
 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
-static inline bool selinux_disabled(struct selinux_state *state)
+static inline bool selinux_disabled(void)
 {
-	return READ_ONCE(state->disabled);
+	return READ_ONCE(selinux_state.disabled);
 }
 
-static inline void selinux_mark_disabled(struct selinux_state *state)
+static inline void selinux_mark_disabled(void)
 {
-	WRITE_ONCE(state->disabled, true);
+	WRITE_ONCE(selinux_state.disabled, true);
 }
 #else
-static inline bool selinux_disabled(struct selinux_state *state)
+static inline bool selinux_disabled(void)
 {
 	return false;
 }
@@ -237,20 +235,14 @@ struct selinux_load_state {
 	struct selinux_policy_convert_data *convert_data;
 };
 
-int security_mls_enabled(struct selinux_state *state);
-int security_load_policy(struct selinux_state *state,
-			 void *data, size_t len,
+int security_mls_enabled(void);
+int security_load_policy(void *data, size_t len,
 			 struct selinux_load_state *load_state);
-void selinux_policy_commit(struct selinux_state *state,
-			   struct selinux_load_state *load_state);
-void selinux_policy_cancel(struct selinux_state *state,
-			   struct selinux_load_state *load_state);
-int security_read_policy(struct selinux_state *state,
-			 void **data, size_t *len);
-int security_read_state_kernel(struct selinux_state *state,
-			       void **data, size_t *len);
-int security_policycap_supported(struct selinux_state *state,
-				 unsigned int req_cap);
+void selinux_policy_commit(struct selinux_load_state *load_state);
+void selinux_policy_cancel(struct selinux_load_state *load_state);
+int security_read_policy(void **data, size_t *len);
+int security_read_state_kernel(void **data, size_t *len);
+int security_policycap_supported(unsigned int req_cap);
 
 #define SEL_VEC_MAX 32
 struct av_decision {
@@ -287,94 +279,68 @@ struct extended_perms {
 /* definitions of av_decision.flags */
 #define AVD_FLAGS_PERMISSIVE	0x0001
 
-void security_compute_av(struct selinux_state *state,
-			 u32 ssid, u32 tsid,
+void security_compute_av(u32 ssid, u32 tsid,
 			 u16 tclass, struct av_decision *avd,
 			 struct extended_perms *xperms);
 
-void security_compute_xperms_decision(struct selinux_state *state,
-				      u32 ssid, u32 tsid, u16 tclass,
+void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass,
 				      u8 driver,
 				      struct extended_perms_decision *xpermd);
 
-void security_compute_av_user(struct selinux_state *state,
-			      u32 ssid, u32 tsid,
+void security_compute_av_user(u32 ssid, u32 tsid,
 			      u16 tclass, struct av_decision *avd);
 
-int security_transition_sid(struct selinux_state *state,
-			    u32 ssid, u32 tsid, u16 tclass,
+int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
 			    const struct qstr *qstr, u32 *out_sid);
 
-int security_transition_sid_user(struct selinux_state *state,
-				 u32 ssid, u32 tsid, u16 tclass,
+int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
 				 const char *objname, u32 *out_sid);
 
-int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
-			u16 tclass, u32 *out_sid);
+int security_member_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
 
-int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
-			u16 tclass, u32 *out_sid);
+int security_change_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
 
-int security_sid_to_context(struct selinux_state *state, u32 sid,
-			    char **scontext, u32 *scontext_len);
+int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len);
 
-int security_sid_to_context_force(struct selinux_state *state,
-				  u32 sid, char **scontext, u32 *scontext_len);
+int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
 
-int security_sid_to_context_inval(struct selinux_state *state,
-				  u32 sid, char **scontext, u32 *scontext_len);
+int security_sid_to_context_inval(u32 sid, char **scontext, u32 *scontext_len);
 
-int security_context_to_sid(struct selinux_state *state,
-			    const char *scontext, u32 scontext_len,
+int security_context_to_sid(const char *scontext, u32 scontext_len,
 			    u32 *out_sid, gfp_t gfp);
 
-int security_context_str_to_sid(struct selinux_state *state,
-				const char *scontext, u32 *out_sid, gfp_t gfp);
+int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp);
 
-int security_context_to_sid_default(struct selinux_state *state,
-				    const char *scontext, u32 scontext_len,
+int security_context_to_sid_default(const char *scontext, u32 scontext_len,
 				    u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
 
-int security_context_to_sid_force(struct selinux_state *state,
-				  const char *scontext, u32 scontext_len,
+int security_context_to_sid_force(const char *scontext, u32 scontext_len,
 				  u32 *sid);
 
-int security_get_user_sids(struct selinux_state *state,
-			   u32 callsid, char *username,
-			   u32 **sids, u32 *nel);
+int security_get_user_sids(u32 callsid, char *username, u32 **sids, u32 *nel);
 
-int security_port_sid(struct selinux_state *state,
-		      u8 protocol, u16 port, u32 *out_sid);
+int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
 
-int security_ib_pkey_sid(struct selinux_state *state,
-			 u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
+int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
 
-int security_ib_endport_sid(struct selinux_state *state,
-			    const char *dev_name, u8 port_num, u32 *out_sid);
+int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid);
 
-int security_netif_sid(struct selinux_state *state,
-		       char *name, u32 *if_sid);
+int security_netif_sid(char *name, u32 *if_sid);
 
-int security_node_sid(struct selinux_state *state,
-		      u16 domain, void *addr, u32 addrlen,
+int security_node_sid(u16 domain, void *addr, u32 addrlen,
 		      u32 *out_sid);
 
-int security_validate_transition(struct selinux_state *state,
-				 u32 oldsid, u32 newsid, u32 tasksid,
+int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
 				 u16 tclass);
 
-int security_validate_transition_user(struct selinux_state *state,
-				      u32 oldsid, u32 newsid, u32 tasksid,
+int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
 				      u16 tclass);
 
-int security_bounded_transition(struct selinux_state *state,
-				u32 oldsid, u32 newsid);
+int security_bounded_transition(u32 oldsid, u32 newsid);
 
-int security_sid_mls_copy(struct selinux_state *state,
-			  u32 sid, u32 mls_sid, u32 *new_sid);
+int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
 
-int security_net_peersid_resolve(struct selinux_state *state,
-				 u32 nlbl_sid, u32 nlbl_type,
+int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
 				 u32 xfrm_sid,
 				 u32 *peer_sid);
 
@@ -382,8 +348,8 @@ int security_get_classes(struct selinux_policy *policy,
 			 char ***classes, int *nclasses);
 int security_get_permissions(struct selinux_policy *policy,
 			     char *class, char ***perms, int *nperms);
-int security_get_reject_unknown(struct selinux_state *state);
-int security_get_allow_unknown(struct selinux_state *state);
+int security_get_reject_unknown(void);
+int security_get_allow_unknown(void);
 
 #define SECURITY_FS_USE_XATTR		1 /* use xattr */
 #define SECURITY_FS_USE_TRANS		2 /* use transition SIDs, e.g. devpts/tmpfs */
@@ -394,10 +360,9 @@ int security_get_allow_unknown(struct selinux_state *state);
 #define SECURITY_FS_USE_NATIVE		7 /* use native label support */
 #define SECURITY_FS_USE_MAX		7 /* Highest SECURITY_FS_USE_XXX */
 
-int security_fs_use(struct selinux_state *state, struct super_block *sb);
+int security_fs_use(struct super_block *sb);
 
-int security_genfs_sid(struct selinux_state *state,
-		       const char *fstype, const char *path, u16 sclass,
+int security_genfs_sid(const char *fstype, const char *path, u16 sclass,
 		       u32 *sid);
 
 int selinux_policy_genfs_sid(struct selinux_policy *policy,
@@ -405,23 +370,19 @@ int selinux_policy_genfs_sid(struct selinux_policy *policy,
 		       u32 *sid);
 
 #ifdef CONFIG_NETLABEL
-int security_netlbl_secattr_to_sid(struct selinux_state *state,
-				   struct netlbl_lsm_secattr *secattr,
+int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
 				   u32 *sid);
 
-int security_netlbl_sid_to_secattr(struct selinux_state *state,
-				   u32 sid,
+int security_netlbl_sid_to_secattr(u32 sid,
 				   struct netlbl_lsm_secattr *secattr);
 #else
-static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
-					    struct netlbl_lsm_secattr *secattr,
+static inline int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
 					    u32 *sid)
 {
 	return -EIDRM;
 }
 
-static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
-					 u32 sid,
+static inline int security_netlbl_sid_to_secattr(u32 sid,
 					 struct netlbl_lsm_secattr *secattr)
 {
 	return -ENOENT;
@@ -433,7 +394,7 @@ const char *security_get_initial_sid_context(u32 sid);
 /*
  * status notifier using mmap interface
  */
-extern struct page *selinux_kernel_status_page(struct selinux_state *state);
+extern struct page *selinux_kernel_status_page(void);
 
 #define SELINUX_KERNEL_STATUS_VERSION	1
 struct selinux_kernel_status {
@@ -447,12 +408,10 @@ struct selinux_kernel_status {
 	 */
 } __packed;
 
-extern void selinux_status_update_setenforce(struct selinux_state *state,
-					     int enforcing);
-extern void selinux_status_update_policyload(struct selinux_state *state,
-					     int seqno);
+extern void selinux_status_update_setenforce(int enforcing);
+extern void selinux_status_update_policyload(int seqno);
 extern void selinux_complete_init(void);
-extern int selinux_disable(struct selinux_state *state);
+extern int selinux_disable(void);
 extern void exit_sel_fs(void);
 extern struct path selinux_null;
 extern void selnl_notify_setenforce(int val);
@@ -462,6 +421,6 @@ extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
 extern void avtab_cache_init(void);
 extern void ebitmap_cache_init(void);
 extern void hashtab_cache_init(void);
-extern int security_sidtab_hash_stats(struct selinux_state *state, char *page);
+extern int security_sidtab_hash_stats(char *page);
 
 #endif /* _SELINUX_SECURITY_H_ */