Merge branch 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

Pull security subsystem updates from James Morris:

 - Extend LSM stacking to allow sharing of cred, file, ipc, inode, and
   task blobs. This paves the way for more full-featured LSMs to be
   merged, and is specifically aimed at LandLock and SARA LSMs. This
   work is from Casey and Kees.

 - There's a new LSM from Micah Morton: "SafeSetID gates the setid
   family of syscalls to restrict UID/GID transitions from a given
   UID/GID to only those approved by a system-wide whitelist." This
   feature is currently shipping in ChromeOS.

* 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (62 commits)
  keys: fix missing __user in KEYCTL_PKEY_QUERY
  LSM: Update list of SECURITYFS users in Kconfig
  LSM: Ignore "security=" when "lsm=" is specified
  LSM: Update function documentation for cap_capable
  security: mark expected switch fall-throughs and add a missing break
  tomoyo: Bump version.
  LSM: fix return value check in safesetid_init_securityfs()
  LSM: SafeSetID: add selftest
  LSM: SafeSetID: remove unused include
  LSM: SafeSetID: 'depend' on CONFIG_SECURITY
  LSM: Add 'name' field for SafeSetID in DEFINE_LSM
  LSM: add SafeSetID module that gates setid calls
  LSM: add SafeSetID module that gates setid calls
  tomoyo: Allow multiple use_group lines.
  tomoyo: Coding style fix.
  tomoyo: Swicth from cred->security to task_struct->security.
  security: keys: annotate implicit fall throughs
  security: keys: annotate implicit fall throughs
  security: keys: annotate implicit fall through
  capabilities:: annotate implicit fall through
  ...

5 files changed, 59 insertions, 70 deletions

diff --git a/include/linux/capability.h b/include/linux/capability.h
index f640dcbc880c..c3f9a4d558a0 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -209,6 +209,7 @@ extern bool has_ns_capability_noaudit(struct task_struct *t,
 extern bool capable(int cap);
 extern bool ns_capable(struct user_namespace *ns, int cap);
 extern bool ns_capable_noaudit(struct user_namespace *ns, int cap);
+extern bool ns_capable_setid(struct user_namespace *ns, int cap);
 #else
 static inline bool has_capability(struct task_struct *t, int cap)
 {
@@ -240,6 +241,10 @@ static inline bool ns_capable_noaudit(struct user_namespace *ns, int cap)
 {
 	return true;
 }
+static inline bool ns_capable_setid(struct user_namespace *ns, int cap)
+{
+	return true;
+}
 #endif /* CONFIG_MULTIUSER */
 extern bool privileged_wrt_inode_uidgid(struct user_namespace *ns, const struct inode *inode);
 extern bool capable_wrt_inode_uidgid(const struct inode *inode, int cap);
diff --git a/include/linux/cred.h b/include/linux/cred.h
index 4907c9df86b3..ddd45bb74887 100644
--- a/include/linux/cred.h
+++ b/include/linux/cred.h
@@ -15,7 +15,6 @@
 #include <linux/capability.h>
 #include <linux/init.h>
 #include <linux/key.h>
-#include <linux/selinux.h>
 #include <linux/atomic.h>
 #include <linux/uidgid.h>
 #include <linux/sched.h>
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 9a0bdf91e646..22fc786d723a 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1270,7 +1270,7 @@
  *	@cred contains the credentials to use.
  *	@ns contains the user namespace we want the capability in
  *	@cap contains the capability <include/linux/capability.h>.
- *	@audit contains whether to write an audit message or not
+ *	@opts contains options for the capable check <include/linux/security.h>
  *	Return 0 if the capability is granted for @tsk.
  * @syslog:
  *	Check permission before accessing the kernel message ring or changing
@@ -1446,8 +1446,10 @@ union security_list_options {
 			const kernel_cap_t *effective,
 			const kernel_cap_t *inheritable,
 			const kernel_cap_t *permitted);
-	int (*capable)(const struct cred *cred, struct user_namespace *ns,
-			int cap, int audit);
+	int (*capable)(const struct cred *cred,
+			struct user_namespace *ns,
+			int cap,
+			unsigned int opts);
 	int (*quotactl)(int cmds, int type, int id, struct super_block *sb);
 	int (*quota_on)(struct dentry *dentry);
 	int (*syslog)(int type);
@@ -2028,6 +2030,18 @@ struct security_hook_list {
 } __randomize_layout;
 
 /*
+ * Security blob size or offset data.
+ */
+struct lsm_blob_sizes {
+	int	lbs_cred;
+	int	lbs_file;
+	int	lbs_inode;
+	int	lbs_ipc;
+	int	lbs_msg_msg;
+	int	lbs_task;
+};
+
+/*
  * Initializing a security_hook_list structure takes
  * up a lot of space in a source file. This macro takes
  * care of the common case and reduces the amount of
@@ -2042,9 +2056,21 @@ extern char *lsm_names;
 extern void security_add_hooks(struct security_hook_list *hooks, int count,
 				char *lsm);
 
+#define LSM_FLAG_LEGACY_MAJOR	BIT(0)
+#define LSM_FLAG_EXCLUSIVE	BIT(1)
+
+enum lsm_order {
+	LSM_ORDER_FIRST = -1,	/* This is only for capabilities. */
+	LSM_ORDER_MUTABLE = 0,
+};
+
 struct lsm_info {
 	const char *name;	/* Required. */
+	enum lsm_order order;	/* Optional: default is LSM_ORDER_MUTABLE */
+	unsigned long flags;	/* Optional: flags describing LSM */
+	int *enabled;		/* Optional: controlled by CONFIG_LSM */
 	int (*init)(void);	/* Required. */
+	struct lsm_blob_sizes *blobs; /* Optional: for blob sharing. */
 };
 
 extern struct lsm_info __start_lsm_info[], __end_lsm_info[];
@@ -2084,17 +2110,6 @@ static inline void security_delete_hooks(struct security_hook_list *hooks,
 #define __lsm_ro_after_init	__ro_after_init
 #endif /* CONFIG_SECURITY_WRITABLE_HOOKS */
 
-extern int __init security_module_enable(const char *module);
-extern void __init capability_add_hooks(void);
-#ifdef CONFIG_SECURITY_YAMA
-extern void __init yama_add_hooks(void);
-#else
-static inline void __init yama_add_hooks(void) { }
-#endif
-#ifdef CONFIG_SECURITY_LOADPIN
-void __init loadpin_add_hooks(void);
-#else
-static inline void loadpin_add_hooks(void) { };
-#endif
+extern int lsm_inode_alloc(struct inode *inode);
 
 #endif /* ! __LINUX_LSM_HOOKS_H */
diff --git a/include/linux/security.h b/include/linux/security.h
index dbfb5a66babb..13537a49ae97 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -54,9 +54,12 @@ struct xattr;
 struct xfrm_sec_ctx;
 struct mm_struct;
 
+/* Default (no) options for the capable function */
+#define CAP_OPT_NONE 0x0
 /* If capable should audit the security request */
-#define SECURITY_CAP_NOAUDIT 0
-#define SECURITY_CAP_AUDIT 1
+#define CAP_OPT_NOAUDIT BIT(1)
+/* If capable is being called by a setid function */
+#define CAP_OPT_INSETID BIT(2)
 
 /* LSM Agnostic defines for sb_set_mnt_opts */
 #define SECURITY_LSM_NATIVE_LABELS	1
@@ -72,7 +75,7 @@ enum lsm_event {
 
 /* These functions are in security/commoncap.c */
 extern int cap_capable(const struct cred *cred, struct user_namespace *ns,
-		       int cap, int audit);
+		       int cap, unsigned int opts);
 extern int cap_settime(const struct timespec64 *ts, const struct timezone *tz);
 extern int cap_ptrace_access_check(struct task_struct *child, unsigned int mode);
 extern int cap_ptrace_traceme(struct task_struct *parent);
@@ -207,10 +210,10 @@ int security_capset(struct cred *new, const struct cred *old,
 		    const kernel_cap_t *effective,
 		    const kernel_cap_t *inheritable,
 		    const kernel_cap_t *permitted);
-int security_capable(const struct cred *cred, struct user_namespace *ns,
-			int cap);
-int security_capable_noaudit(const struct cred *cred, struct user_namespace *ns,
-			     int cap);
+int security_capable(const struct cred *cred,
+		       struct user_namespace *ns,
+		       int cap,
+		       unsigned int opts);
 int security_quotactl(int cmds, int type, int id, struct super_block *sb);
 int security_quota_on(struct dentry *dentry);
 int security_syslog(int type);
@@ -366,8 +369,10 @@ int security_sem_semctl(struct kern_ipc_perm *sma, int cmd);
 int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops,
 			unsigned nsops, int alter);
 void security_d_instantiate(struct dentry *dentry, struct inode *inode);
-int security_getprocattr(struct task_struct *p, char *name, char **value);
-int security_setprocattr(const char *name, void *value, size_t size);
+int security_getprocattr(struct task_struct *p, const char *lsm, char *name,
+			 char **value);
+int security_setprocattr(const char *lsm, const char *name, void *value,
+			 size_t size);
 int security_netlink_send(struct sock *sk, struct sk_buff *skb);
 int security_ismaclabel(const char *name);
 int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen);
@@ -462,14 +467,11 @@ static inline int security_capset(struct cred *new,
 }
 
 static inline int security_capable(const struct cred *cred,
-				   struct user_namespace *ns, int cap)
+				   struct user_namespace *ns,
+				   int cap,
+				   unsigned int opts)
 {
-	return cap_capable(cred, ns, cap, SECURITY_CAP_AUDIT);
-}
-
-static inline int security_capable_noaudit(const struct cred *cred,
-					   struct user_namespace *ns, int cap) {
-	return cap_capable(cred, ns, cap, SECURITY_CAP_NOAUDIT);
+	return cap_capable(cred, ns, cap, opts);
 }
 
 static inline int security_quotactl(int cmds, int type, int id,
@@ -1112,15 +1114,18 @@ static inline int security_sem_semop(struct kern_ipc_perm *sma,
 	return 0;
 }
 
-static inline void security_d_instantiate(struct dentry *dentry, struct inode *inode)
+static inline void security_d_instantiate(struct dentry *dentry,
+					  struct inode *inode)
 { }
 
-static inline int security_getprocattr(struct task_struct *p, char *name, char **value)
+static inline int security_getprocattr(struct task_struct *p, const char *lsm,
+				       char *name, char **value)
 {
 	return -EINVAL;
 }
 
-static inline int security_setprocattr(char *name, void *value, size_t size)
+static inline int security_setprocattr(const char *lsm, char *name,
+				       void *value, size_t size)
 {
 	return -EINVAL;
 }
diff --git a/include/linux/selinux.h b/include/linux/selinux.h
deleted file mode 100644
index 44f459612690..000000000000
--- a/include/linux/selinux.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/*
- * SELinux services exported to the rest of the kernel.
- *
- * Author: James Morris <jmorris@redhat.com>
- *
- * Copyright (C) 2005 Red Hat, Inc., James Morris <jmorris@redhat.com>
- * Copyright (C) 2006 Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
- * Copyright (C) 2006 IBM Corporation, Timothy R. Chavez <tinytim@us.ibm.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2,
- * as published by the Free Software Foundation.
- */
-#ifndef _LINUX_SELINUX_H
-#define _LINUX_SELINUX_H
-
-struct selinux_audit_rule;
-struct audit_context;
-struct kern_ipc_perm;
-
-#ifdef CONFIG_SECURITY_SELINUX
-
-/**
- * selinux_is_enabled - is SELinux enabled?
- */
-bool selinux_is_enabled(void);
-#else
-
-static inline bool selinux_is_enabled(void)
-{
-	return false;
-}
-#endif	/* CONFIG_SECURITY_SELINUX */
-
-#endif /* _LINUX_SELINUX_H */