selinux/stable-5.13 PR 20210426

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Merge tag 'selinux-pr-20210426' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux

Pull selinux updates from Paul Moore:

 - Add support for measuring the SELinux state and policy capabilities
   using IMA.

 - A handful of SELinux/NFS patches to compare the SELinux state of one
   mount with a set of mount options. Olga goes into more detail in the
   patch descriptions, but this is important as it allows more
   flexibility when using NFS and SELinux context mounts.

 - Properly differentiate between the subjective and objective LSM
   credentials; including support for the SELinux and Smack. My clumsy
   attempt at a proper fix for AppArmor didn't quite pass muster so John
   is working on a proper AppArmor patch, in the meantime this set of
   patches shouldn't change the behavior of AppArmor in any way. This
   change explains the bulk of the diffstat beyond security/.

 - Fix a problem where we were not properly terminating the permission
   list for two SELinux object classes.

* tag 'selinux-pr-20210426' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
  selinux: add proper NULL termination to the secclass_map permissions
  smack: differentiate between subjective and objective task credentials
  selinux: clarify task subjective and objective credentials
  lsm: separate security_task_getsecid() into subjective and objective variants
  nfs: account for selinux security context when deciding to share superblock
  nfs: remove unneeded null check in nfs_fill_super()
  lsm,selinux: add new hook to compare new mount to an existing mount
  selinux: fix misspellings using codespell tool
  selinux: fix misspellings using codespell tool
  selinux: measure state and policy capabilities
  selinux: Allow context mounts for unpriviliged overlayfs

drivers/android/binder.c

@@ -2713,7 +2713,16 @@ static void binder_transaction(struct binder_proc *proc,
 		u32 secid;
 		size_t added_size;
 
-		security_task_getsecid(proc->tsk, &secid);
+		/*
+		 * Arguably this should be the task's subjective LSM secid but
+		 * we can't reliably access the subjective creds of a task
+		 * other than our own so we must use the objective creds, which
+		 * are safe to access.  The downside is that if a task is
+		 * temporarily overriding it's creds it will not be reflected
+		 * here; however, it isn't clear that binder would handle that
+		 * case well anyway.
+		 */
+		security_task_getsecid_obj(proc->tsk, &secid);
 		ret = security_secid_to_secctx(secid, &secctx, &secctx_sz);
 		if (ret) {
 			return_error = BR_FAILED_REPLY;

fs/nfs/fs_context.c

@@ -463,6 +463,9 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
 	if (opt < 0)
 		return ctx->sloppy ? 1 : opt;
 
+	if (fc->security)
+		ctx->has_sec_mnt_opts = 1;
+
 	switch (opt) {
 	case Opt_source:
 		if (fc->source)

fs/nfs/internal.h

@@ -96,6 +96,7 @@ struct nfs_fs_context {
 	char			*fscache_uniq;
 	unsigned short		protofamily;
 	unsigned short		mountfamily;
+	bool			has_sec_mnt_opts;
 
 	struct {
 		union {

fs/nfs/super.c

@@ -1045,7 +1045,7 @@ static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx)
 	sb->s_blocksize = 0;
 	sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
 	sb->s_op = server->nfs_client->cl_nfs_mod->sops;
-	if (ctx && ctx->bsize)
+	if (ctx->bsize)
 		sb->s_blocksize = nfs_block_size(ctx->bsize, &sb->s_blocksize_bits);
 
 	if (server->nfs_client->rpc_ops->version != 2) {
@@ -1077,6 +1077,7 @@ static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx)
 						 &sb->s_blocksize_bits);
 
 	nfs_super_set_maxbytes(sb, server->maxfilesize);
+	server->has_sec_mnt_opts = ctx->has_sec_mnt_opts;
 }
 
 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b,
@@ -1193,6 +1194,9 @@ static int nfs_compare_super(struct super_block *sb, struct fs_context *fc)
 		return 0;
 	if (!nfs_compare_userns(old, server))
 		return 0;
+	if ((old->has_sec_mnt_opts || fc->security) &&
+			security_sb_mnt_opts_compat(sb, fc->security))
+		return 0;
 	return nfs_compare_mount_options(sb, server, fc);
 }
 

include/linux/cred.h

@@ -140,7 +140,7 @@ struct cred {
 	struct key	*request_key_auth; /* assumed request_key authority */
 #endif
 #ifdef CONFIG_SECURITY
-	void		*security;	/* subjective LSM security */
+	void		*security;	/* LSM security */
 #endif
 	struct user_struct *user;	/* real user ID subscription */
 	struct user_namespace *user_ns; /* user_ns the caps and keyrings are relative to. */

include/linux/lsm_hook_defs.h

@@ -62,6 +62,7 @@ LSM_HOOK(int, 0, sb_alloc_security, struct super_block *sb)
 LSM_HOOK(void, LSM_RET_VOID, sb_free_security, struct super_block *sb)
 LSM_HOOK(void, LSM_RET_VOID, sb_free_mnt_opts, void *mnt_opts)
 LSM_HOOK(int, 0, sb_eat_lsm_opts, char *orig, void **mnt_opts)
+LSM_HOOK(int, 0, sb_mnt_opts_compat, struct super_block *sb, void *mnt_opts)
 LSM_HOOK(int, 0, sb_remount, struct super_block *sb, void *mnt_opts)
 LSM_HOOK(int, 0, sb_kern_mount, struct super_block *sb)
 LSM_HOOK(int, 0, sb_show_options, struct seq_file *m, struct super_block *sb)
@@ -203,7 +204,10 @@ LSM_HOOK(int, 0, task_fix_setgid, struct cred *new, const struct cred * old,
 LSM_HOOK(int, 0, task_setpgid, struct task_struct *p, pid_t pgid)
 LSM_HOOK(int, 0, task_getpgid, struct task_struct *p)
 LSM_HOOK(int, 0, task_getsid, struct task_struct *p)
-LSM_HOOK(void, LSM_RET_VOID, task_getsecid, struct task_struct *p, u32 *secid)
+LSM_HOOK(void, LSM_RET_VOID, task_getsecid_subj,
+	 struct task_struct *p, u32 *secid)
+LSM_HOOK(void, LSM_RET_VOID, task_getsecid_obj,
+	 struct task_struct *p, u32 *secid)
 LSM_HOOK(int, 0, task_setnice, struct task_struct *p, int nice)
 LSM_HOOK(int, 0, task_setioprio, struct task_struct *p, int ioprio)
 LSM_HOOK(int, 0, task_getioprio, struct task_struct *p)

include/linux/lsm_hooks.h

@@ -142,6 +142,12 @@
  *	@orig the original mount data copied from userspace.
  *	@copy copied data which will be passed to the security module.
  *	Returns 0 if the copy was successful.
+ * @sb_mnt_opts_compat:
+ *	Determine if the new mount options in @mnt_opts are allowed given
+ *	the existing mounted filesystem at @sb.
+ *	@sb superblock being compared
+ *	@mnt_opts new mount options
+ *	Return 0 if options are compatible.
  * @sb_remount:
  *	Extracts security system specific mount options and verifies no changes
  *	are being made to those options.
@@ -707,9 +713,15 @@
  *	@p.
  *	@p contains the task_struct for the process.
  *	Return 0 if permission is granted.
- * @task_getsecid:
+ * @task_getsecid_subj:
- *	Retrieve the security identifier of the process @p.
+ *	Retrieve the subjective security identifier of the task_struct in @p
- *	@p contains the task_struct for the process and place is into @secid.
+ *	and return it in @secid.  Special care must be taken to ensure that @p
+ *	is the either the "current" task, or the caller has exclusive access
+ *	to @p.
+ *	In case of failure, @secid will be set to zero.
+ * @task_getsecid_obj:
+ *	Retrieve the objective security identifier of the task_struct in @p
+ *	and return it in @secid.
  *	In case of failure, @secid will be set to zero.
  *
  * @task_setnice:

include/linux/nfs_fs_sb.h

@@ -256,6 +256,7 @@ struct nfs_server {
 
 	/* User namespace info */
 	const struct cred	*cred;
+	bool			has_sec_mnt_opts;
 };
 
 /* Server capabilities */

include/linux/security.h

@@ -294,6 +294,7 @@ int security_sb_alloc(struct super_block *sb);
 void security_sb_free(struct super_block *sb);
 void security_free_mnt_opts(void **mnt_opts);
 int security_sb_eat_lsm_opts(char *options, void **mnt_opts);
+int security_sb_mnt_opts_compat(struct super_block *sb, void *mnt_opts);
 int security_sb_remount(struct super_block *sb, void *mnt_opts);
 int security_sb_kern_mount(struct super_block *sb);
 int security_sb_show_options(struct seq_file *m, struct super_block *sb);
@@ -414,7 +415,8 @@ int security_task_fix_setgid(struct cred *new, const struct cred *old,
 int security_task_setpgid(struct task_struct *p, pid_t pgid);
 int security_task_getpgid(struct task_struct *p);
 int security_task_getsid(struct task_struct *p);
-void security_task_getsecid(struct task_struct *p, u32 *secid);
+void security_task_getsecid_subj(struct task_struct *p, u32 *secid);
+void security_task_getsecid_obj(struct task_struct *p, u32 *secid);
 int security_task_setnice(struct task_struct *p, int nice);
 int security_task_setioprio(struct task_struct *p, int ioprio);
 int security_task_getioprio(struct task_struct *p);
@@ -646,6 +648,13 @@ static inline int security_sb_remount(struct super_block *sb,
 	return 0;
 }
 
+static inline int security_sb_mnt_opts_compat(struct super_block *sb,
+					      void *mnt_opts)
+{
+	return 0;
+}
+
+
 static inline int security_sb_kern_mount(struct super_block *sb)
 {
 	return 0;
@@ -1098,7 +1107,12 @@ static inline int security_task_getsid(struct task_struct *p)
 	return 0;
 }
 
-static inline void security_task_getsecid(struct task_struct *p, u32 *secid)
+static inline void security_task_getsecid_subj(struct task_struct *p, u32 *secid)
+{
+	*secid = 0;
+}
+
+static inline void security_task_getsecid_obj(struct task_struct *p, u32 *secid)
 {
 	*secid = 0;
 }

kernel/audit.c

@@ -2132,7 +2132,7 @@ int audit_log_task_context(struct audit_buffer *ab)
 	int error;
 	u32 sid;
 
-	security_task_getsecid(current, &sid);
+	security_task_getsecid_subj(current, &sid);
 	if (!sid)
 		return 0;
 
@@ -2353,7 +2353,7 @@ int audit_signal_info(int sig, struct task_struct *t)
 			audit_sig_uid = auid;
 		else
 			audit_sig_uid = uid;
-		security_task_getsecid(current, &audit_sig_sid);
+		security_task_getsecid_subj(current, &audit_sig_sid);
 	}
 
 	return audit_signal_info_syscall(t);

kernel/auditfilter.c

@@ -1359,7 +1359,8 @@ int audit_filter(int msgtype, unsigned int listtype)
 			case AUDIT_SUBJ_SEN:
 			case AUDIT_SUBJ_CLR:
 				if (f->lsm_rule) {
-					security_task_getsecid(current, &sid);
+					security_task_getsecid_subj(current,
+								    &sid);
 					result = security_audit_rule_match(sid,
 						   f->type, f->op, f->lsm_rule);
 				}

kernel/auditsc.c

@@ -667,7 +667,7 @@ static int audit_filter_rules(struct task_struct *tsk,
 			   logged upon error */
 			if (f->lsm_rule) {
 				if (need_sid) {
-					security_task_getsecid(tsk, &sid);
+					security_task_getsecid_subj(tsk, &sid);
 					need_sid = 0;
 				}
 				result = security_audit_rule_match(sid, f->type,
@@ -2400,7 +2400,7 @@ void __audit_ptrace(struct task_struct *t)
 	context->target_auid = audit_get_loginuid(t);
 	context->target_uid = task_uid(t);
 	context->target_sessionid = audit_get_sessionid(t);
-	security_task_getsecid(t, &context->target_sid);
+	security_task_getsecid_obj(t, &context->target_sid);
 	memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
 }
 
@@ -2427,7 +2427,7 @@ int audit_signal_info_syscall(struct task_struct *t)
 		ctx->target_auid = audit_get_loginuid(t);
 		ctx->target_uid = t_uid;
 		ctx->target_sessionid = audit_get_sessionid(t);
-		security_task_getsecid(t, &ctx->target_sid);
+		security_task_getsecid_obj(t, &ctx->target_sid);
 		memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
 		return 0;
 	}
@@ -2448,7 +2448,7 @@ int audit_signal_info_syscall(struct task_struct *t)
 	axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
 	axp->target_uid[axp->pid_count] = t_uid;
 	axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
-	security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
+	security_task_getsecid_obj(t, &axp->target_sid[axp->pid_count]);
 	memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
 	axp->pid_count++;
 

kernel/bpf/bpf_lsm.c

@@ -209,7 +209,8 @@ BTF_ID(func, bpf_lsm_socket_socketpair)
 
 BTF_ID(func, bpf_lsm_syslog)
 BTF_ID(func, bpf_lsm_task_alloc)
-BTF_ID(func, bpf_lsm_task_getsecid)
+BTF_ID(func, bpf_lsm_task_getsecid_subj)
+BTF_ID(func, bpf_lsm_task_getsecid_obj)
 BTF_ID(func, bpf_lsm_task_prctl)
 BTF_ID(func, bpf_lsm_task_setscheduler)
 BTF_ID(func, bpf_lsm_task_to_inode)

net/netlabel/netlabel_unlabeled.c

@@ -1539,7 +1539,7 @@ int __init netlbl_unlabel_defconf(void)
 	/* Only the kernel is allowed to call this function and the only time
 	 * it is called is at bootup before the audit subsystem is reporting
 	 * messages so don't worry to much about these values. */
-	security_task_getsecid(current, &audit_info.secid);
+	security_task_getsecid_subj(current, &audit_info.secid);
 	audit_info.loginuid = GLOBAL_ROOT_UID;
 	audit_info.sessionid = 0;
 

net/netlabel/netlabel_user.h

@@ -34,7 +34,7 @@
 static inline void netlbl_netlink_auditinfo(struct sk_buff *skb,
 					    struct netlbl_audit *audit_info)
 {
-	security_task_getsecid(current, &audit_info->secid);
+	security_task_getsecid_subj(current, &audit_info->secid);
 	audit_info->loginuid = audit_get_loginuid(current);
 	audit_info->sessionid = audit_get_sessionid(current);
 }

security/apparmor/lsm.c

@@ -1252,7 +1252,8 @@ static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
 
 	LSM_HOOK_INIT(task_free, apparmor_task_free),
 	LSM_HOOK_INIT(task_alloc, apparmor_task_alloc),
-	LSM_HOOK_INIT(task_getsecid, apparmor_task_getsecid),
+	LSM_HOOK_INIT(task_getsecid_subj, apparmor_task_getsecid),
+	LSM_HOOK_INIT(task_getsecid_obj, apparmor_task_getsecid),
 	LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
 	LSM_HOOK_INIT(task_kill, apparmor_task_kill),
 

security/integrity/ima/ima_appraise.c

@@ -76,7 +76,7 @@ int ima_must_appraise(struct user_namespace *mnt_userns, struct inode *inode,
 	if (!ima_appraise)
 		return 0;
 
-	security_task_getsecid(current, &secid);
+	security_task_getsecid_subj(current, &secid);
 	return ima_match_policy(mnt_userns, inode, current_cred(), secid, func,
 				mask, IMA_APPRAISE | IMA_HASH, NULL, NULL, NULL);
 }

security/integrity/ima/ima_main.c

@@ -391,7 +391,7 @@ int ima_file_mmap(struct file *file, unsigned long prot)
 	u32 secid;
 
 	if (file && (prot & PROT_EXEC)) {
-		security_task_getsecid(current, &secid);
+		security_task_getsecid_subj(current, &secid);
 		return process_measurement(file, current_cred(), secid, NULL,
 					   0, MAY_EXEC, MMAP_CHECK);
 	}
@@ -429,7 +429,7 @@ int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot)
 	    !(prot & PROT_EXEC) || (vma->vm_flags & VM_EXEC))
 		return 0;
 
-	security_task_getsecid(current, &secid);
+	security_task_getsecid_subj(current, &secid);
 	inode = file_inode(vma->vm_file);
 	action = ima_get_action(file_mnt_user_ns(vma->vm_file), inode,
 				current_cred(), secid, MAY_EXEC, MMAP_CHECK,
@@ -470,7 +470,7 @@ int ima_bprm_check(struct linux_binprm *bprm)
 	int ret;
 	u32 secid;
 
-	security_task_getsecid(current, &secid);
+	security_task_getsecid_subj(current, &secid);
 	ret = process_measurement(bprm->file, current_cred(), secid, NULL, 0,
 				  MAY_EXEC, BPRM_CHECK);
 	if (ret)
@@ -495,7 +495,7 @@ int ima_file_check(struct file *file, int mask)
 {
 	u32 secid;
 
-	security_task_getsecid(current, &secid);
+	security_task_getsecid_subj(current, &secid);
 	return process_measurement(file, current_cred(), secid, NULL, 0,
 				   mask & (MAY_READ | MAY_WRITE | MAY_EXEC |
 					   MAY_APPEND), FILE_CHECK);
@@ -686,7 +686,7 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id,
 
 	/* Read entire file for all partial reads. */
 	func = read_idmap[read_id] ?: FILE_CHECK;
-	security_task_getsecid(current, &secid);
+	security_task_getsecid_subj(current, &secid);
 	return process_measurement(file, current_cred(), secid, NULL,
 				   0, MAY_READ, func);
 }
@@ -729,7 +729,7 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
 	}
 
 	func = read_idmap[read_id] ?: FILE_CHECK;
-	security_task_getsecid(current, &secid);
+	security_task_getsecid_subj(current, &secid);
 	return process_measurement(file, current_cred(), secid, buf, size,
 				   MAY_READ, func);
 }
@@ -872,7 +872,7 @@ void process_buffer_measurement(struct user_namespace *mnt_userns,
 	 * buffer measurements.
 	 */
 	if (func) {
-		security_task_getsecid(current, &secid);
+		security_task_getsecid_subj(current, &secid);
 		action = ima_get_action(mnt_userns, inode, current_cred(),
 					secid, 0, func, &pcr, &template,
 					func_data);

security/security.c

@@ -890,6 +890,13 @@ int security_sb_eat_lsm_opts(char *options, void **mnt_opts)
 }
 EXPORT_SYMBOL(security_sb_eat_lsm_opts);
 
+int security_sb_mnt_opts_compat(struct super_block *sb,
+				void *mnt_opts)
+{
+	return call_int_hook(sb_mnt_opts_compat, 0, sb, mnt_opts);
+}
+EXPORT_SYMBOL(security_sb_mnt_opts_compat);
+
 int security_sb_remount(struct super_block *sb,
 			void *mnt_opts)
 {
@@ -1762,12 +1769,19 @@ int security_task_getsid(struct task_struct *p)
 	return call_int_hook(task_getsid, 0, p);
 }
 
-void security_task_getsecid(struct task_struct *p, u32 *secid)
+void security_task_getsecid_subj(struct task_struct *p, u32 *secid)
 {
 	*secid = 0;
-	call_void_hook(task_getsecid, p, secid);
+	call_void_hook(task_getsecid_subj, p, secid);
 }
-EXPORT_SYMBOL(security_task_getsecid);
+EXPORT_SYMBOL(security_task_getsecid_subj);
+
+void security_task_getsecid_obj(struct task_struct *p, u32 *secid)
+{
+	*secid = 0;
+	call_void_hook(task_getsecid_obj, p, secid);
+}
+EXPORT_SYMBOL(security_task_getsecid_obj);
 
 int security_task_setnice(struct task_struct *p, int nice)
 {

security/selinux/hooks.c

@@ -229,10 +229,23 @@ static inline u32 cred_sid(const struct cred *cred)
 	return tsec->sid;
 }
 
+/*
+ * get the subjective security ID of a task
+ */
+static inline u32 task_sid_subj(const struct task_struct *task)
+{
+	u32 sid;
+
+	rcu_read_lock();
+	sid = cred_sid(rcu_dereference(task->cred));
+	rcu_read_unlock();
+	return sid;
+}
+
 /*
  * get the objective security ID of a task
  */
-static inline u32 task_sid(const struct task_struct *task)
+static inline u32 task_sid_obj(const struct task_struct *task)
 {
 	u32 sid;
 
@@ -242,6 +255,29 @@ static inline u32 task_sid(const struct task_struct *task)
 	return sid;
 }
 
+/*
+ * get the security ID of a task for use with binder
+ */
+static inline u32 task_sid_binder(const struct task_struct *task)
+{
+	/*
+	 * In many case where this function is used we should be using the
+	 * task's subjective SID, but we can't reliably access the subjective
+	 * creds of a task other than our own so we must use the objective
+	 * creds/SID, which are safe to access.  The downside is that if a task
+	 * is temporarily overriding it's creds it will not be reflected here;
+	 * however, it isn't clear that binder would handle that case well
+	 * anyway.
+	 *
+	 * If this ever changes and we can safely reference the subjective
+	 * creds/SID of another task, this function will make it easier to
+	 * identify the various places where we make use of the task SIDs in
+	 * the binder code.  It is also likely that we will need to adjust
+	 * the main drivers/android binder code as well.
+	 */
+	return task_sid_obj(task);
+}
+
 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry);
 
 /*
@@ -760,7 +796,8 @@ static int selinux_set_mnt_opts(struct super_block *sb,
 	if (sb->s_user_ns != &init_user_ns &&
 	    strcmp(sb->s_type->name, "tmpfs") &&
 	    strcmp(sb->s_type->name, "ramfs") &&
-	    strcmp(sb->s_type->name, "devpts")) {
+	    strcmp(sb->s_type->name, "devpts") &&
+	    strcmp(sb->s_type->name, "overlay")) {
 		if (context_sid || fscontext_sid || rootcontext_sid ||
 		    defcontext_sid) {
 			rc = -EACCES;
@@ -2034,11 +2071,8 @@ static inline u32 open_file_to_av(struct file *file)
 
 static int selinux_binder_set_context_mgr(struct task_struct *mgr)
 {
-	u32 mysid = current_sid();
-	u32 mgrsid = task_sid(mgr);
-
 	return avc_has_perm(&selinux_state,
-			    mysid, mgrsid, SECCLASS_BINDER,
+			    current_sid(), task_sid_binder(mgr), SECCLASS_BINDER,
 			    BINDER__SET_CONTEXT_MGR, NULL);
 }
 
@@ -2046,8 +2080,7 @@ static int selinux_binder_transaction(struct task_struct *from,
 				      struct task_struct *to)
 {
 	u32 mysid = current_sid();
-	u32 fromsid = task_sid(from);
+	u32 fromsid = task_sid_binder(from);
-	u32 tosid = task_sid(to);
 	int rc;
 
 	if (mysid != fromsid) {
@@ -2058,19 +2091,16 @@ static int selinux_binder_transaction(struct task_struct *from,
 			return rc;
 	}
 
-	return avc_has_perm(&selinux_state,
+	return avc_has_perm(&selinux_state, fromsid, task_sid_binder(to),
-			    fromsid, tosid, SECCLASS_BINDER, BINDER__CALL,
+			    SECCLASS_BINDER, BINDER__CALL, NULL);
-			    NULL);
 }
 
 static int selinux_binder_transfer_binder(struct task_struct *from,
 					  struct task_struct *to)
 {
-	u32 fromsid = task_sid(from);
-	u32 tosid = task_sid(to);
-
 	return avc_has_perm(&selinux_state,
-			    fromsid, tosid, SECCLASS_BINDER, BINDER__TRANSFER,
+			    task_sid_binder(from), task_sid_binder(to),
+			    SECCLASS_BINDER, BINDER__TRANSFER,
 			    NULL);
 }
 
@@ -2078,7 +2108,7 @@ static int selinux_binder_transfer_file(struct task_struct *from,
 					struct task_struct *to,
 					struct file *file)
 {
-	u32 sid = task_sid(to);
+	u32 sid = task_sid_binder(to);
 	struct file_security_struct *fsec = selinux_file(file);
 	struct dentry *dentry = file->f_path.dentry;
 	struct inode_security_struct *isec;
@@ -2114,10 +2144,10 @@ static int selinux_binder_transfer_file(struct task_struct *from,
 }
 
 static int selinux_ptrace_access_check(struct task_struct *child,
-				     unsigned int mode)
+				       unsigned int mode)
 {
 	u32 sid = current_sid();
-	u32 csid = task_sid(child);
+	u32 csid = task_sid_obj(child);
 
 	if (mode & PTRACE_MODE_READ)
 		return avc_has_perm(&selinux_state,
@@ -2130,15 +2160,15 @@ static int selinux_ptrace_access_check(struct task_struct *child,
 static int selinux_ptrace_traceme(struct task_struct *parent)
 {
 	return avc_has_perm(&selinux_state,
-			    task_sid(parent), current_sid(), SECCLASS_PROCESS,
+			    task_sid_subj(parent), task_sid_obj(current),
-			    PROCESS__PTRACE, NULL);
+			    SECCLASS_PROCESS, PROCESS__PTRACE, NULL);
 }
 
 static int selinux_capget(struct task_struct *target, kernel_cap_t *effective,
 			  kernel_cap_t *inheritable, kernel_cap_t *permitted)
 {
 	return avc_has_perm(&selinux_state,
-			    current_sid(), task_sid(target), SECCLASS_PROCESS,
+			    current_sid(), task_sid_obj(target), SECCLASS_PROCESS,
 			    PROCESS__GETCAP, NULL);
 }
 
@@ -2263,7 +2293,7 @@ static u32 ptrace_parent_sid(void)
 	rcu_read_lock();
 	tracer = ptrace_parent(current);
 	if (tracer)
-		sid = task_sid(tracer);
+		sid = task_sid_obj(tracer);
 	rcu_read_unlock();
 
 	return sid;
@@ -2684,6 +2714,61 @@ free_opt:
 	return rc;
 }
 
+static int selinux_sb_mnt_opts_compat(struct super_block *sb, void *mnt_opts)
+{
+	struct selinux_mnt_opts *opts = mnt_opts;
+	struct superblock_security_struct *sbsec = sb->s_security;
+	u32 sid;
+	int rc;
+
+	/*
+	 * Superblock not initialized (i.e. no options) - reject if any
+	 * options specified, otherwise accept.
+	 */
+	if (!(sbsec->flags & SE_SBINITIALIZED))
+		return opts ? 1 : 0;
+
+	/*
+	 * Superblock initialized and no options specified - reject if
+	 * superblock has any options set, otherwise accept.
+	 */
+	if (!opts)
+		return (sbsec->flags & SE_MNTMASK) ? 1 : 0;
+
+	if (opts->fscontext) {
+		rc = parse_sid(sb, opts->fscontext, &sid);
+		if (rc)
+			return 1;
+		if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid))
+			return 1;
+	}
+	if (opts->context) {
+		rc = parse_sid(sb, opts->context, &sid);
+		if (rc)
+			return 1;
+		if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid))
+			return 1;
+	}
+	if (opts->rootcontext) {
+		struct inode_security_struct *root_isec;
+
+		root_isec = backing_inode_security(sb->s_root);
+		rc = parse_sid(sb, opts->rootcontext, &sid);
+		if (rc)
+			return 1;
+		if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid))
+			return 1;
+	}
+	if (opts->defcontext) {
+		rc = parse_sid(sb, opts->defcontext, &sid);
+		if (rc)
+			return 1;
+		if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid))
+			return 1;
+	}
+	return 0;
+}
+
 static int selinux_sb_remount(struct super_block *sb, void *mnt_opts)
 {
 	struct selinux_mnt_opts *opts = mnt_opts;
@@ -3920,7 +4005,7 @@ static int selinux_file_send_sigiotask(struct task_struct *tsk,
 				       struct fown_struct *fown, int signum)
 {
 	struct file *file;
-	u32 sid = task_sid(tsk);
+	u32 sid = task_sid_obj(tsk);
 	u32 perm;
 	struct file_security_struct *fsec;
 
@@ -4139,47 +4224,52 @@ static int selinux_kernel_load_data(enum kernel_load_data_id id, bool contents)
 static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
 {
 	return avc_has_perm(&selinux_state,
-			    current_sid(), task_sid(p), SECCLASS_PROCESS,
+			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
 			    PROCESS__SETPGID, NULL);
 }
 
 static int selinux_task_getpgid(struct task_struct *p)
 {
 	return avc_has_perm(&selinux_state,
-			    current_sid(), task_sid(p), SECCLASS_PROCESS,
+			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
 			    PROCESS__GETPGID, NULL);
 }
 
 static int selinux_task_getsid(struct task_struct *p)
 {
 	return avc_has_perm(&selinux_state,
-			    current_sid(), task_sid(p), SECCLASS_PROCESS,
+			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
 			    PROCESS__GETSESSION, NULL);
 }
 
-static void selinux_task_getsecid(struct task_struct *p, u32 *secid)
+static void selinux_task_getsecid_subj(struct task_struct *p, u32 *secid)
 {
-	*secid = task_sid(p);
+	*secid = task_sid_subj(p);
+}
+
+static void selinux_task_getsecid_obj(struct task_struct *p, u32 *secid)
+{
+	*secid = task_sid_obj(p);
 }
 
 static int selinux_task_setnice(struct task_struct *p, int nice)
 {
 	return avc_has_perm(&selinux_state,
-			    current_sid(), task_sid(p), SECCLASS_PROCESS,
+			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
 			    PROCESS__SETSCHED, NULL);
 }
 
 static int selinux_task_setioprio(struct task_struct *p, int ioprio)
 {
 	return avc_has_perm(&selinux_state,
-			    current_sid(), task_sid(p), SECCLASS_PROCESS,
+			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
 			    PROCESS__SETSCHED, NULL);
 }
 
 static int selinux_task_getioprio(struct task_struct *p)
 {
 	return avc_has_perm(&selinux_state,
-			    current_sid(), task_sid(p), SECCLASS_PROCESS,
+			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
 			    PROCESS__GETSCHED, NULL);
 }
 
@@ -4210,7 +4300,7 @@ static int selinux_task_setrlimit(struct task_struct *p, unsigned int resource,
 	   upon context transitions.  See selinux_bprm_committing_creds. */
 	if (old_rlim->rlim_max != new_rlim->rlim_max)
 		return avc_has_perm(&selinux_state,
-				    current_sid(), task_sid(p),
+				    current_sid(), task_sid_obj(p),
 				    SECCLASS_PROCESS, PROCESS__SETRLIMIT, NULL);
 
 	return 0;
@@ -4219,21 +4309,21 @@ static int selinux_task_setrlimit(struct task_struct *p, unsigned int resource,
 static int selinux_task_setscheduler(struct task_struct *p)
 {
 	return avc_has_perm(&selinux_state,
-			    current_sid(), task_sid(p), SECCLASS_PROCESS,
+			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
 			    PROCESS__SETSCHED, NULL);
 }
 
 static int selinux_task_getscheduler(struct task_struct *p)
 {
 	return avc_has_perm(&selinux_state,
-			    current_sid(), task_sid(p), SECCLASS_PROCESS,
+			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
 			    PROCESS__GETSCHED, NULL);
 }
 
 static int selinux_task_movememory(struct task_struct *p)
 {
 	return avc_has_perm(&selinux_state,
-			    current_sid(), task_sid(p), SECCLASS_PROCESS,
+			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
 			    PROCESS__SETSCHED, NULL);
 }
 
@@ -4252,14 +4342,14 @@ static int selinux_task_kill(struct task_struct *p, struct kernel_siginfo *info,
 	else
 		secid = cred_sid(cred);
 	return avc_has_perm(&selinux_state,
-			    secid, task_sid(p), SECCLASS_PROCESS, perm, NULL);
+			    secid, task_sid_obj(p), SECCLASS_PROCESS, perm, NULL);
 }
 
 static void selinux_task_to_inode(struct task_struct *p,
 				  struct inode *inode)
 {
 	struct inode_security_struct *isec = selinux_inode(inode);
-	u32 sid = task_sid(p);
+	u32 sid = task_sid_obj(p);
 
 	spin_lock(&isec->lock);
 	isec->sclass = inode_mode_to_security_class(inode->i_mode);
@@ -6152,7 +6242,7 @@ static int selinux_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *m
 	struct ipc_security_struct *isec;
 	struct msg_security_struct *msec;
 	struct common_audit_data ad;
-	u32 sid = task_sid(target);
+	u32 sid = task_sid_subj(target);
 	int rc;
 
 	isec = selinux_ipc(msq);
@@ -7077,6 +7167,7 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
 
 	LSM_HOOK_INIT(sb_free_security, selinux_sb_free_security),
 	LSM_HOOK_INIT(sb_free_mnt_opts, selinux_free_mnt_opts),
+	LSM_HOOK_INIT(sb_mnt_opts_compat, selinux_sb_mnt_opts_compat),
 	LSM_HOOK_INIT(sb_remount, selinux_sb_remount),
 	LSM_HOOK_INIT(sb_kern_mount, selinux_sb_kern_mount),
 	LSM_HOOK_INIT(sb_show_options, selinux_sb_show_options),
@@ -7148,7 +7239,8 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(task_setpgid, selinux_task_setpgid),
 	LSM_HOOK_INIT(task_getpgid, selinux_task_getpgid),
 	LSM_HOOK_INIT(task_getsid, selinux_task_getsid),
-	LSM_HOOK_INIT(task_getsecid, selinux_task_getsecid),
+	LSM_HOOK_INIT(task_getsecid_subj, selinux_task_getsecid_subj),
+	LSM_HOOK_INIT(task_getsecid_obj, selinux_task_getsecid_obj),
 	LSM_HOOK_INIT(task_setnice, selinux_task_setnice),
 	LSM_HOOK_INIT(task_setioprio, selinux_task_setioprio),
 	LSM_HOOK_INIT(task_getioprio, selinux_task_getioprio),

security/selinux/ima.c

@@ -13,18 +13,83 @@
 #include "ima.h"
 
 /*
- * selinux_ima_measure_state - Measure hash of the SELinux policy
+ * selinux_ima_collect_state - Read selinux configuration settings
+ *
+ * @state: selinux_state
+ *
+ * On success returns the configuration settings string.
+ * On error, returns NULL.
+ */
+static char *selinux_ima_collect_state(struct selinux_state *state)
+{
+	const char *on = "=1;", *off = "=0;";
+	char *buf;
+	int buf_len, len, i, rc;
+
+	buf_len = strlen("initialized=0;enforcing=0;checkreqprot=0;") + 1;
+
+	len = strlen(on);
+	for (i = 0; i < __POLICYDB_CAPABILITY_MAX; i++)
+		buf_len += strlen(selinux_policycap_names[i]) + len;
+
+	buf = kzalloc(buf_len, GFP_KERNEL);
+	if (!buf)
+		return NULL;
+
+	rc = strscpy(buf, "initialized", buf_len);
+	WARN_ON(rc < 0);
+
+	rc = strlcat(buf, selinux_initialized(state) ? on : off, buf_len);
+	WARN_ON(rc >= buf_len);
+
+	rc = strlcat(buf, "enforcing", buf_len);
+	WARN_ON(rc >= buf_len);
+
+	rc = strlcat(buf, enforcing_enabled(state) ? on : off, buf_len);
+	WARN_ON(rc >= buf_len);
+
+	rc = strlcat(buf, "checkreqprot", buf_len);
+	WARN_ON(rc >= buf_len);
+
+	rc = strlcat(buf, checkreqprot_get(state) ? on : off, buf_len);
+	WARN_ON(rc >= buf_len);
+
+	for (i = 0; i < __POLICYDB_CAPABILITY_MAX; i++) {
+		rc = strlcat(buf, selinux_policycap_names[i], buf_len);
+		WARN_ON(rc >= buf_len);
+
+		rc = strlcat(buf, state->policycap[i] ? on : off, buf_len);
+		WARN_ON(rc >= buf_len);
+	}
+
+	return buf;
+}
+
+/*
+ * selinux_ima_measure_state_locked - Measure SELinux state and hash of policy
  *
  * @state: selinux state struct
- *
- * NOTE: This function must be called with policy_mutex held.
  */
-void selinux_ima_measure_state(struct selinux_state *state)
+void selinux_ima_measure_state_locked(struct selinux_state *state)
 {
+	char *state_str = NULL;
 	void *policy = NULL;
 	size_t policy_len;
 	int rc = 0;
 
+	WARN_ON(!mutex_is_locked(&state->policy_mutex));
+
+	state_str = selinux_ima_collect_state(state);
+	if (!state_str) {
+		pr_err("SELinux: %s: failed to read state.\n", __func__);
+		return;
+	}
+
+	ima_measure_critical_data("selinux", "selinux-state",
+				  state_str, strlen(state_str), false);
+
+	kfree(state_str);
+
 	/*
 	 * Measure SELinux policy only after initialization is completed.
 	 */
@@ -42,3 +107,17 @@ void selinux_ima_measure_state(struct selinux_state *state)
 
 	vfree(policy);
 }
+
+/*
+ * selinux_ima_measure_state - Measure SELinux state and hash of policy
+ *
+ * @state: selinux state struct
+ */
+void selinux_ima_measure_state(struct selinux_state *state)
+{
+	WARN_ON(mutex_is_locked(&state->policy_mutex));
+
+	mutex_lock(&state->policy_mutex);
+	selinux_ima_measure_state_locked(state);
+	mutex_unlock(&state->policy_mutex);
+}

security/selinux/include/classmap.h

@@ -242,11 +242,12 @@ struct security_class_mapping secclass_map[] = {
 	{ "infiniband_endport",
 	  { "manage_subnet", NULL } },
 	{ "bpf",
-	  {"map_create", "map_read", "map_write", "prog_load", "prog_run"} },
+	  { "map_create", "map_read", "map_write", "prog_load", "prog_run",
+	    NULL } },
 	{ "xdp_socket",
 	  { COMMON_SOCK_PERMS, NULL } },
 	{ "perf_event",
-	  {"open", "cpu", "kernel", "tracepoint", "read", "write"} },
+	  { "open", "cpu", "kernel", "tracepoint", "read", "write", NULL } },
 	{ "lockdown",
 	  { "integrity", "confidentiality", NULL } },
 	{ "anon_inode",

security/selinux/include/ima.h

@@ -15,10 +15,16 @@
 
 #ifdef CONFIG_IMA
 extern void selinux_ima_measure_state(struct selinux_state *selinux_state);
+extern void selinux_ima_measure_state_locked(
+			struct selinux_state *selinux_state);
 #else
 static inline void selinux_ima_measure_state(struct selinux_state *selinux_state)
 {
 }
+static inline void selinux_ima_measure_state_locked(
+			struct selinux_state *selinux_state)
+{
+}
 #endif
 
 #endif	/* _SELINUX_IMA_H_ */

security/selinux/include/security.h

@@ -426,7 +426,7 @@ extern struct page *selinux_kernel_status_page(struct selinux_state *state);
 
 #define SELINUX_KERNEL_STATUS_VERSION	1
 struct selinux_kernel_status {
-	u32	version;	/* version number of thie structure */
+	u32	version;	/* version number of the structure */
 	u32	sequence;	/* sequence number of seqlock logic */
 	u32	enforcing;	/* current setting of enforcing mode */
 	u32	policyload;	/* times of policy reloaded */

security/selinux/selinuxfs.c

@@ -41,6 +41,7 @@
 #include "security.h"
 #include "objsec.h"
 #include "conditional.h"
+#include "ima.h"
 
 enum sel_inos {
 	SEL_ROOT_INO = 2,
@@ -182,6 +183,8 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
 		selinux_status_update_setenforce(state, new_value);
 		if (!new_value)
 			call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
+
+		selinux_ima_measure_state(state);
 	}
 	length = count;
 out:
@@ -758,6 +761,9 @@ static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
 
 	checkreqprot_set(fsi->state, (new_value ? 1 : 0));
 	length = count;
+
+	selinux_ima_measure_state(fsi->state);
+
 out:
 	kfree(page);
 	return length;

security/selinux/ss/hashtab.c

@@ -13,7 +13,7 @@ static struct kmem_cache *hashtab_node_cachep __ro_after_init;
 
 /*
  * Here we simply round the number of elements up to the nearest power of two.
- * I tried also other options like rouding down or rounding to the closest
+ * I tried also other options like rounding down or rounding to the closest
  * power of two (up or down based on which is closer), but I was unable to
  * find any significant difference in lookup/insert performance that would
  * justify switching to a different (less intuitive) formula. It could be that

security/selinux/ss/services.c

@@ -2202,7 +2202,7 @@ static void selinux_notify_policy_change(struct selinux_state *state,
 	selinux_status_update_policyload(state, seqno);
 	selinux_netlbl_cache_invalidate();
 	selinux_xfrm_notify_policyload();
-	selinux_ima_measure_state(state);
+	selinux_ima_measure_state_locked(state);
 }
 
 void selinux_policy_commit(struct selinux_state *state,

security/smack/smack.h

@@ -383,7 +383,23 @@ static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
 	return tsp->smk_task;
 }
 
-static inline struct smack_known *smk_of_task_struct(
+static inline struct smack_known *smk_of_task_struct_subj(
+						const struct task_struct *t)
+{
+	struct smack_known *skp;
+	const struct cred *cred;
+
+	rcu_read_lock();
+
+	cred = rcu_dereference(t->cred);
+	skp = smk_of_task(smack_cred(cred));
+
+	rcu_read_unlock();
+
+	return skp;
+}
+
+static inline struct smack_known *smk_of_task_struct_obj(
 						const struct task_struct *t)
 {
 	struct smack_known *skp;

security/smack/smack_lsm.c

@@ -159,7 +159,7 @@ static int smk_bu_current(char *note, struct smack_known *oskp,
 static int smk_bu_task(struct task_struct *otp, int mode, int rc)
 {
 	struct task_smack *tsp = smack_cred(current_cred());
-	struct smack_known *smk_task = smk_of_task_struct(otp);
+	struct smack_known *smk_task = smk_of_task_struct_obj(otp);
 	char acc[SMK_NUM_ACCESS_TYPE + 1];
 
 	if (rc <= 0)
@@ -479,7 +479,7 @@ static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
 {
 	struct smack_known *skp;
 
-	skp = smk_of_task_struct(ctp);
+	skp = smk_of_task_struct_obj(ctp);
 
 	return smk_ptrace_rule_check(current, skp, mode, __func__);
 }
@@ -2033,7 +2033,7 @@ static int smk_curacc_on_task(struct task_struct *p, int access,
 				const char *caller)
 {
 	struct smk_audit_info ad;
-	struct smack_known *skp = smk_of_task_struct(p);
+	struct smack_known *skp = smk_of_task_struct_subj(p);
 	int rc;
 
 	smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
@@ -2078,15 +2078,29 @@ static int smack_task_getsid(struct task_struct *p)
 }
 
 /**
- * smack_task_getsecid - get the secid of the task
+ * smack_task_getsecid_subj - get the subjective secid of the task
- * @p: the object task
+ * @p: the task
  * @secid: where to put the result
  *
- * Sets the secid to contain a u32 version of the smack label.
+ * Sets the secid to contain a u32 version of the task's subjective smack label.
  */
-static void smack_task_getsecid(struct task_struct *p, u32 *secid)
+static void smack_task_getsecid_subj(struct task_struct *p, u32 *secid)
 {
-	struct smack_known *skp = smk_of_task_struct(p);
+	struct smack_known *skp = smk_of_task_struct_subj(p);
+
+	*secid = skp->smk_secid;
+}
+
+/**
+ * smack_task_getsecid_obj - get the objective secid of the task
+ * @p: the task
+ * @secid: where to put the result
+ *
+ * Sets the secid to contain a u32 version of the task's objective smack label.
+ */
+static void smack_task_getsecid_obj(struct task_struct *p, u32 *secid)
+{
+	struct smack_known *skp = smk_of_task_struct_obj(p);
 
 	*secid = skp->smk_secid;
 }
@@ -2174,7 +2188,7 @@ static int smack_task_kill(struct task_struct *p, struct kernel_siginfo *info,
 {
 	struct smk_audit_info ad;
 	struct smack_known *skp;
-	struct smack_known *tkp = smk_of_task_struct(p);
+	struct smack_known *tkp = smk_of_task_struct_obj(p);
 	int rc;
 
 	if (!sig)
@@ -2212,7 +2226,7 @@ static int smack_task_kill(struct task_struct *p, struct kernel_siginfo *info,
 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
 {
 	struct inode_smack *isp = smack_inode(inode);
-	struct smack_known *skp = smk_of_task_struct(p);
+	struct smack_known *skp = smk_of_task_struct_obj(p);
 
 	isp->smk_inode = skp;
 	isp->smk_flags |= SMK_INODE_INSTANT;
@@ -3483,7 +3497,7 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
  */
 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
 {
-	struct smack_known *skp = smk_of_task_struct(p);
+	struct smack_known *skp = smk_of_task_struct_subj(p);
 	char *cp;
 	int slen;
 
@@ -4759,7 +4773,8 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(task_setpgid, smack_task_setpgid),
 	LSM_HOOK_INIT(task_getpgid, smack_task_getpgid),
 	LSM_HOOK_INIT(task_getsid, smack_task_getsid),
-	LSM_HOOK_INIT(task_getsecid, smack_task_getsecid),
+	LSM_HOOK_INIT(task_getsecid_subj, smack_task_getsecid_subj),
+	LSM_HOOK_INIT(task_getsecid_obj, smack_task_getsecid_obj),
 	LSM_HOOK_INIT(task_setnice, smack_task_setnice),
 	LSM_HOOK_INIT(task_setioprio, smack_task_setioprio),
 	LSM_HOOK_INIT(task_getioprio, smack_task_getioprio),