Merge branch 'disintegrate-asm-generic' of git://git.infradead.org/users/dhowells/linux-headers into asm-generic

Patches from David Howells <dhowells@redhat.com>:

This is to complete part of the UAPI disintegration for which the
preparatory patches were pulled recently.

Note that there are some fixup patches which are at the base of the
branch aimed at you, plus all arches get the asm-generic branch merged in too.

* 'disintegrate-asm-generic' of git://git.infradead.org/users/dhowells/linux-headers:
  UAPI: (Scripted) Disintegrate include/asm-generic
  UAPI: Fix conditional header installation handling (notably kvm_para.h on m68k)
  c6x: remove c6x signal.h
  UAPI: Split compound conditionals containing __KERNEL__ in Arm64
  UAPI: Fix the guards on various asm/unistd.h files

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 155 insertions, 54 deletions

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 1a9583008aa..c7dacd2eab7 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -24,22 +24,29 @@
 #define IMA_MASK 	0x0002
 #define IMA_FSMAGIC	0x0004
 #define IMA_UID		0x0008
+#define IMA_FOWNER	0x0010
 
-enum ima_action { UNKNOWN = -1, DONT_MEASURE = 0, MEASURE };
+#define UNKNOWN		0
+#define MEASURE		0x0001	/* same as IMA_MEASURE */
+#define DONT_MEASURE	0x0002
+#define APPRAISE	0x0004	/* same as IMA_APPRAISE */
+#define DONT_APPRAISE	0x0008
+#define AUDIT		0x0040
 
 #define MAX_LSM_RULES 6
 enum lsm_rule_types { LSM_OBJ_USER, LSM_OBJ_ROLE, LSM_OBJ_TYPE,
 	LSM_SUBJ_USER, LSM_SUBJ_ROLE, LSM_SUBJ_TYPE
 };
 
-struct ima_measure_rule_entry {
+struct ima_rule_entry {
 	struct list_head list;
-	enum ima_action action;
+	int action;
 	unsigned int flags;
 	enum ima_hooks func;
 	int mask;
 	unsigned long fsmagic;
-	uid_t uid;
+	kuid_t uid;
+	kuid_t fowner;
 	struct {
 		void *rule;	/* LSM file metadata specific */
 		int type;	/* audit type */
@@ -48,7 +55,7 @@ struct ima_measure_rule_entry {
 
 /*
  * Without LSM specific knowledge, the default policy can only be
- * written in terms of .action, .func, .mask, .fsmagic, and .uid
+ * written in terms of .action, .func, .mask, .fsmagic, .uid, and .fowner
  */
 
 /*
@@ -57,7 +64,7 @@ struct ima_measure_rule_entry {
  * normal users can easily run the machine out of memory simply building
  * and running executables.
  */
-static struct ima_measure_rule_entry default_rules[] = {
+static struct ima_rule_entry default_rules[] = {
 	{.action = DONT_MEASURE,.fsmagic = PROC_SUPER_MAGIC,.flags = IMA_FSMAGIC},
 	{.action = DONT_MEASURE,.fsmagic = SYSFS_MAGIC,.flags = IMA_FSMAGIC},
 	{.action = DONT_MEASURE,.fsmagic = DEBUGFS_MAGIC,.flags = IMA_FSMAGIC},
@@ -71,23 +78,45 @@ static struct ima_measure_rule_entry default_rules[] = {
 	 .flags = IMA_FUNC | IMA_MASK},
 	{.action = MEASURE,.func = BPRM_CHECK,.mask = MAY_EXEC,
 	 .flags = IMA_FUNC | IMA_MASK},
-	{.action = MEASURE,.func = FILE_CHECK,.mask = MAY_READ,.uid = 0,
+	{.action = MEASURE,.func = FILE_CHECK,.mask = MAY_READ,.uid = GLOBAL_ROOT_UID,
 	 .flags = IMA_FUNC | IMA_MASK | IMA_UID},
 };
 
-static LIST_HEAD(measure_default_rules);
-static LIST_HEAD(measure_policy_rules);
-static struct list_head *ima_measure;
+static struct ima_rule_entry default_appraise_rules[] = {
+	{.action = DONT_APPRAISE,.fsmagic = PROC_SUPER_MAGIC,.flags = IMA_FSMAGIC},
+	{.action = DONT_APPRAISE,.fsmagic = SYSFS_MAGIC,.flags = IMA_FSMAGIC},
+	{.action = DONT_APPRAISE,.fsmagic = DEBUGFS_MAGIC,.flags = IMA_FSMAGIC},
+	{.action = DONT_APPRAISE,.fsmagic = TMPFS_MAGIC,.flags = IMA_FSMAGIC},
+	{.action = DONT_APPRAISE,.fsmagic = RAMFS_MAGIC,.flags = IMA_FSMAGIC},
+	{.action = DONT_APPRAISE,.fsmagic = DEVPTS_SUPER_MAGIC,.flags = IMA_FSMAGIC},
+	{.action = DONT_APPRAISE,.fsmagic = BINFMTFS_MAGIC,.flags = IMA_FSMAGIC},
+	{.action = DONT_APPRAISE,.fsmagic = SECURITYFS_MAGIC,.flags = IMA_FSMAGIC},
+	{.action = DONT_APPRAISE,.fsmagic = SELINUX_MAGIC,.flags = IMA_FSMAGIC},
+	{.action = DONT_APPRAISE,.fsmagic = CGROUP_SUPER_MAGIC,.flags = IMA_FSMAGIC},
+	{.action = APPRAISE,.fowner = GLOBAL_ROOT_UID,.flags = IMA_FOWNER},
+};
+
+static LIST_HEAD(ima_default_rules);
+static LIST_HEAD(ima_policy_rules);
+static struct list_head *ima_rules;
 
-static DEFINE_MUTEX(ima_measure_mutex);
+static DEFINE_MUTEX(ima_rules_mutex);
 
 static bool ima_use_tcb __initdata;
-static int __init default_policy_setup(char *str)
+static int __init default_measure_policy_setup(char *str)
 {
 	ima_use_tcb = 1;
 	return 1;
 }
-__setup("ima_tcb", default_policy_setup);
+__setup("ima_tcb", default_measure_policy_setup);
+
+static bool ima_use_appraise_tcb __initdata;
+static int __init default_appraise_policy_setup(char *str)
+{
+	ima_use_appraise_tcb = 1;
+	return 1;
+}
+__setup("ima_appraise_tcb", default_appraise_policy_setup);
 
 /**
  * ima_match_rules - determine whether an inode matches the measure rule.
@@ -98,7 +127,7 @@ __setup("ima_tcb", default_policy_setup);
  *
  * Returns true on rule match, false on failure.
  */
-static bool ima_match_rules(struct ima_measure_rule_entry *rule,
+static bool ima_match_rules(struct ima_rule_entry *rule,
 			    struct inode *inode, enum ima_hooks func, int mask)
 {
 	struct task_struct *tsk = current;
@@ -112,7 +141,9 @@ static bool ima_match_rules(struct ima_measure_rule_entry *rule,
 	if ((rule->flags & IMA_FSMAGIC)
 	    && rule->fsmagic != inode->i_sb->s_magic)
 		return false;
-	if ((rule->flags & IMA_UID) && rule->uid != cred->uid)
+	if ((rule->flags & IMA_UID) && !uid_eq(rule->uid, cred->uid))
+		return false;
+	if ((rule->flags & IMA_FOWNER) && !uid_eq(rule->fowner, inode->i_uid))
 		return false;
 	for (i = 0; i < MAX_LSM_RULES; i++) {
 		int rc = 0;
@@ -163,39 +194,61 @@ static bool ima_match_rules(struct ima_measure_rule_entry *rule,
  * as elements in the list are never deleted, nor does the list
  * change.)
  */
-int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask)
+int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
+		     int flags)
 {
-	struct ima_measure_rule_entry *entry;
+	struct ima_rule_entry *entry;
+	int action = 0, actmask = flags | (flags << 1);
+
+	list_for_each_entry(entry, ima_rules, list) {
+
+		if (!(entry->action & actmask))
+			continue;
+
+		if (!ima_match_rules(entry, inode, func, mask))
+			continue;
 
-	list_for_each_entry(entry, ima_measure, list) {
-		bool rc;
+		action |= entry->action & IMA_DO_MASK;
+		if (entry->action & IMA_DO_MASK)
+			actmask &= ~(entry->action | entry->action << 1);
+		else
+			actmask &= ~(entry->action | entry->action >> 1);
 
-		rc = ima_match_rules(entry, inode, func, mask);
-		if (rc)
-			return entry->action;
+		if (!actmask)
+			break;
 	}
-	return 0;
+
+	return action;
 }
 
 /**
  * ima_init_policy - initialize the default measure rules.
  *
- * ima_measure points to either the measure_default_rules or the
- * the new measure_policy_rules.
+ * ima_rules points to either the ima_default_rules or the
+ * the new ima_policy_rules.
  */
 void __init ima_init_policy(void)
 {
-	int i, entries;
+	int i, measure_entries, appraise_entries;
 
 	/* if !ima_use_tcb set entries = 0 so we load NO default rules */
-	if (ima_use_tcb)
-		entries = ARRAY_SIZE(default_rules);
-	else
-		entries = 0;
-
-	for (i = 0; i < entries; i++)
-		list_add_tail(&default_rules[i].list, &measure_default_rules);
-	ima_measure = &measure_default_rules;
+	measure_entries = ima_use_tcb ? ARRAY_SIZE(default_rules) : 0;
+	appraise_entries = ima_use_appraise_tcb ?
+			 ARRAY_SIZE(default_appraise_rules) : 0;
+	
+	for (i = 0; i < measure_entries + appraise_entries; i++) {
+		if (i < measure_entries)
+			list_add_tail(&default_rules[i].list,
+				      &ima_default_rules);
+		else {
+			int j = i - measure_entries;
+
+			list_add_tail(&default_appraise_rules[j].list,
+				      &ima_default_rules);
+		}
+	}
+
+	ima_rules = &ima_default_rules;
 }
 
 /**
@@ -212,8 +265,8 @@ void ima_update_policy(void)
 	int result = 1;
 	int audit_info = 0;
 
-	if (ima_measure == &measure_default_rules) {
-		ima_measure = &measure_policy_rules;
+	if (ima_rules == &ima_default_rules) {
+		ima_rules = &ima_policy_rules;
 		cause = "complete";
 		result = 0;
 	}
@@ -224,14 +277,19 @@ void ima_update_policy(void)
 enum {
 	Opt_err = -1,
 	Opt_measure = 1, Opt_dont_measure,
+	Opt_appraise, Opt_dont_appraise,
+	Opt_audit,
 	Opt_obj_user, Opt_obj_role, Opt_obj_type,
 	Opt_subj_user, Opt_subj_role, Opt_subj_type,
-	Opt_func, Opt_mask, Opt_fsmagic, Opt_uid
+	Opt_func, Opt_mask, Opt_fsmagic, Opt_uid, Opt_fowner
 };
 
 static match_table_t policy_tokens = {
 	{Opt_measure, "measure"},
 	{Opt_dont_measure, "dont_measure"},
+	{Opt_appraise, "appraise"},
+	{Opt_dont_appraise, "dont_appraise"},
+	{Opt_audit, "audit"},
 	{Opt_obj_user, "obj_user=%s"},
 	{Opt_obj_role, "obj_role=%s"},
 	{Opt_obj_type, "obj_type=%s"},
@@ -242,10 +300,11 @@ static match_table_t policy_tokens = {
 	{Opt_mask, "mask=%s"},
 	{Opt_fsmagic, "fsmagic=%s"},
 	{Opt_uid, "uid=%s"},
+	{Opt_fowner, "fowner=%s"},
 	{Opt_err, NULL}
 };
 
-static int ima_lsm_rule_init(struct ima_measure_rule_entry *entry,
+static int ima_lsm_rule_init(struct ima_rule_entry *entry,
 			     char *args, int lsm_rule, int audit_type)
 {
 	int result;
@@ -269,7 +328,7 @@ static void ima_log_string(struct audit_buffer *ab, char *key, char *value)
 	audit_log_format(ab, " ");
 }
 
-static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry)
+static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
 {
 	struct audit_buffer *ab;
 	char *p;
@@ -277,7 +336,8 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry)
 
 	ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_INTEGRITY_RULE);
 
-	entry->uid = -1;
+	entry->uid = INVALID_UID;
+	entry->fowner = INVALID_UID;
 	entry->action = UNKNOWN;
 	while ((p = strsep(&rule, " \t")) != NULL) {
 		substring_t args[MAX_OPT_ARGS];
@@ -306,11 +366,35 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry)
 
 			entry->action = DONT_MEASURE;
 			break;
+		case Opt_appraise:
+			ima_log_string(ab, "action", "appraise");
+
+			if (entry->action != UNKNOWN)
+				result = -EINVAL;
+
+			entry->action = APPRAISE;
+			break;
+		case Opt_dont_appraise:
+			ima_log_string(ab, "action", "dont_appraise");
+
+			if (entry->action != UNKNOWN)
+				result = -EINVAL;
+
+			entry->action = DONT_APPRAISE;
+			break;
+		case Opt_audit:
+			ima_log_string(ab, "action", "audit");
+
+			if (entry->action != UNKNOWN)
+				result = -EINVAL;
+
+			entry->action = AUDIT;
+			break;
 		case Opt_func:
 			ima_log_string(ab, "func", args[0].from);
 
 			if (entry->func)
-				result  = -EINVAL;
+				result = -EINVAL;
 
 			if (strcmp(args[0].from, "FILE_CHECK") == 0)
 				entry->func = FILE_CHECK;
@@ -361,20 +445,37 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry)
 		case Opt_uid:
 			ima_log_string(ab, "uid", args[0].from);
 
-			if (entry->uid != -1) {
+			if (uid_valid(entry->uid)) {
 				result = -EINVAL;
 				break;
 			}
 
 			result = strict_strtoul(args[0].from, 10, &lnum);
 			if (!result) {
-				entry->uid = (uid_t) lnum;
-				if (entry->uid != lnum)
+				entry->uid = make_kuid(current_user_ns(), (uid_t)lnum);
+				if (!uid_valid(entry->uid) || (((uid_t)lnum) != lnum))
 					result = -EINVAL;
 				else
 					entry->flags |= IMA_UID;
 			}
 			break;
+		case Opt_fowner:
+			ima_log_string(ab, "fowner", args[0].from);
+
+			if (uid_valid(entry->fowner)) {
+				result = -EINVAL;
+				break;
+			}
+
+			result = strict_strtoul(args[0].from, 10, &lnum);
+			if (!result) {
+				entry->fowner = make_kuid(current_user_ns(), (uid_t)lnum);
+				if (!uid_valid(entry->fowner) || (((uid_t)lnum) != lnum))
+					result = -EINVAL;
+				else
+					entry->flags |= IMA_FOWNER;
+			}
+			break;
 		case Opt_obj_user:
 			ima_log_string(ab, "obj_user", args[0].from);
 			result = ima_lsm_rule_init(entry, args[0].from,
@@ -426,7 +527,7 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry)
 }
 
 /**
- * ima_parse_add_rule - add a rule to measure_policy_rules
+ * ima_parse_add_rule - add a rule to ima_policy_rules
  * @rule - ima measurement policy rule
  *
  * Uses a mutex to protect the policy list from multiple concurrent writers.
@@ -436,12 +537,12 @@ ssize_t ima_parse_add_rule(char *rule)
 {
 	const char *op = "update_policy";
 	char *p;
-	struct ima_measure_rule_entry *entry;
+	struct ima_rule_entry *entry;
 	ssize_t result, len;
 	int audit_info = 0;
 
 	/* Prevent installed policy from changing */
-	if (ima_measure != &measure_default_rules) {
+	if (ima_rules != &ima_default_rules) {
 		integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL,
 				    NULL, op, "already exists",
 				    -EACCES, audit_info);
@@ -474,9 +575,9 @@ ssize_t ima_parse_add_rule(char *rule)
 		return result;
 	}
 
-	mutex_lock(&ima_measure_mutex);
-	list_add_tail(&entry->list, &measure_policy_rules);
-	mutex_unlock(&ima_measure_mutex);
+	mutex_lock(&ima_rules_mutex);
+	list_add_tail(&entry->list, &ima_policy_rules);
+	mutex_unlock(&ima_rules_mutex);
 
 	return len;
 }
@@ -484,12 +585,12 @@ ssize_t ima_parse_add_rule(char *rule)
 /* ima_delete_rules called to cleanup invalid policy */
 void ima_delete_rules(void)
 {
-	struct ima_measure_rule_entry *entry, *tmp;
+	struct ima_rule_entry *entry, *tmp;
 
-	mutex_lock(&ima_measure_mutex);
-	list_for_each_entry_safe(entry, tmp, &measure_policy_rules, list) {
+	mutex_lock(&ima_rules_mutex);
+	list_for_each_entry_safe(entry, tmp, &ima_policy_rules, list) {
 		list_del(&entry->list);
 		kfree(entry);
 	}
-	mutex_unlock(&ima_measure_mutex);
+	mutex_unlock(&ima_rules_mutex);
 }