Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1101 insertions, 0 deletions

diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c
new file mode 100644
index 000000000..11dd8260c
--- /dev/null
+++ b/security/tomoyo/util.c
@@ -0,0 +1,1101 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/util.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include <linux/slab.h>
+#include <linux/rculist.h>
+
+#include "common.h"
+
+/* Lock for protecting policy. */
+DEFINE_MUTEX(tomoyo_policy_lock);
+
+/* Has /sbin/init started? */
+bool tomoyo_policy_loaded;
+
+/*
+ * Mapping table from "enum tomoyo_mac_index" to
+ * "enum tomoyo_mac_category_index".
+ */
+const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX] = {
+	/* CONFIG::file group */
+	[TOMOYO_MAC_FILE_EXECUTE]    = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_OPEN]       = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_CREATE]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_UNLINK]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_GETATTR]    = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_MKDIR]      = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_RMDIR]      = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_MKFIFO]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_MKSOCK]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_TRUNCATE]   = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_SYMLINK]    = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_MKBLOCK]    = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_MKCHAR]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_LINK]       = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_RENAME]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_CHMOD]      = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_CHOWN]      = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_CHGRP]      = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_IOCTL]      = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_CHROOT]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_MOUNT]      = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_UMOUNT]     = TOMOYO_MAC_CATEGORY_FILE,
+	[TOMOYO_MAC_FILE_PIVOT_ROOT] = TOMOYO_MAC_CATEGORY_FILE,
+	/* CONFIG::network group */
+	[TOMOYO_MAC_NETWORK_INET_STREAM_BIND]       =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN]     =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT]    =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_INET_DGRAM_BIND]        =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_INET_DGRAM_SEND]        =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_INET_RAW_BIND]          =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_INET_RAW_SEND]          =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND]       =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN]     =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT]    =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND]        =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND]        =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND]    =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN]  =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] =
+	TOMOYO_MAC_CATEGORY_NETWORK,
+	/* CONFIG::misc group */
+	[TOMOYO_MAC_ENVIRON]         = TOMOYO_MAC_CATEGORY_MISC,
+};
+
+/**
+ * tomoyo_convert_time - Convert time_t to YYYY/MM/DD hh/mm/ss.
+ *
+ * @time:  Seconds since 1970/01/01 00:00:00.
+ * @stamp: Pointer to "struct tomoyo_time".
+ *
+ * Returns nothing.
+ */
+void tomoyo_convert_time(time64_t time64, struct tomoyo_time *stamp)
+{
+	struct tm tm;
+
+	time64_to_tm(time64, 0, &tm);
+	stamp->sec = tm.tm_sec;
+	stamp->min = tm.tm_min;
+	stamp->hour = tm.tm_hour;
+	stamp->day = tm.tm_mday;
+	stamp->month = tm.tm_mon + 1;
+	stamp->year = tm.tm_year + 1900;
+}
+
+/**
+ * tomoyo_permstr - Find permission keywords.
+ *
+ * @string: String representation for permissions in foo/bar/buz format.
+ * @keyword: Keyword to find from @string/
+ *
+ * Returns true if @keyword was found in @string, false otherwise.
+ *
+ * This function assumes that strncmp(w1, w2, strlen(w1)) != 0 if w1 != w2.
+ */
+bool tomoyo_permstr(const char *string, const char *keyword)
+{
+	const char *cp = strstr(string, keyword);
+
+	if (cp)
+		return cp == string || *(cp - 1) == '/';
+	return false;
+}
+
+/**
+ * tomoyo_read_token - Read a word from a line.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns a word on success, "" otherwise.
+ *
+ * To allow the caller to skip NULL check, this function returns "" rather than
+ * NULL if there is no more words to read.
+ */
+char *tomoyo_read_token(struct tomoyo_acl_param *param)
+{
+	char *pos = param->data;
+	char *del = strchr(pos, ' ');
+
+	if (del)
+		*del++ = '\0';
+	else
+		del = pos + strlen(pos);
+	param->data = del;
+	return pos;
+}
+
+static bool tomoyo_correct_path2(const char *filename, const size_t len);
+
+/**
+ * tomoyo_get_domainname - Read a domainname from a line.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns a domainname on success, NULL otherwise.
+ */
+const struct tomoyo_path_info *tomoyo_get_domainname
+(struct tomoyo_acl_param *param)
+{
+	char *start = param->data;
+	char *pos = start;
+
+	while (*pos) {
+		if (*pos++ != ' ' ||
+		    tomoyo_correct_path2(pos, strchrnul(pos, ' ') - pos))
+			continue;
+		*(pos - 1) = '\0';
+		break;
+	}
+	param->data = pos;
+	if (tomoyo_correct_domain(start))
+		return tomoyo_get_name(start);
+	return NULL;
+}
+
+/**
+ * tomoyo_parse_ulong - Parse an "unsigned long" value.
+ *
+ * @result: Pointer to "unsigned long".
+ * @str:    Pointer to string to parse.
+ *
+ * Returns one of values in "enum tomoyo_value_type".
+ *
+ * The @src is updated to point the first character after the value
+ * on success.
+ */
+u8 tomoyo_parse_ulong(unsigned long *result, char **str)
+{
+	const char *cp = *str;
+	char *ep;
+	int base = 10;
+
+	if (*cp == '0') {
+		char c = *(cp + 1);
+
+		if (c == 'x' || c == 'X') {
+			base = 16;
+			cp += 2;
+		} else if (c >= '0' && c <= '7') {
+			base = 8;
+			cp++;
+		}
+	}
+	*result = simple_strtoul(cp, &ep, base);
+	if (cp == ep)
+		return TOMOYO_VALUE_TYPE_INVALID;
+	*str = ep;
+	switch (base) {
+	case 16:
+		return TOMOYO_VALUE_TYPE_HEXADECIMAL;
+	case 8:
+		return TOMOYO_VALUE_TYPE_OCTAL;
+	default:
+		return TOMOYO_VALUE_TYPE_DECIMAL;
+	}
+}
+
+/**
+ * tomoyo_print_ulong - Print an "unsigned long" value.
+ *
+ * @buffer:     Pointer to buffer.
+ * @buffer_len: Size of @buffer.
+ * @value:      An "unsigned long" value.
+ * @type:       Type of @value.
+ *
+ * Returns nothing.
+ */
+void tomoyo_print_ulong(char *buffer, const int buffer_len,
+			const unsigned long value, const u8 type)
+{
+	if (type == TOMOYO_VALUE_TYPE_DECIMAL)
+		snprintf(buffer, buffer_len, "%lu", value);
+	else if (type == TOMOYO_VALUE_TYPE_OCTAL)
+		snprintf(buffer, buffer_len, "0%lo", value);
+	else if (type == TOMOYO_VALUE_TYPE_HEXADECIMAL)
+		snprintf(buffer, buffer_len, "0x%lX", value);
+	else
+		snprintf(buffer, buffer_len, "type(%u)", type);
+}
+
+/**
+ * tomoyo_parse_name_union - Parse a tomoyo_name_union.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ * @ptr:   Pointer to "struct tomoyo_name_union".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_parse_name_union(struct tomoyo_acl_param *param,
+			     struct tomoyo_name_union *ptr)
+{
+	char *filename;
+
+	if (param->data[0] == '@') {
+		param->data++;
+		ptr->group = tomoyo_get_group(param, TOMOYO_PATH_GROUP);
+		return ptr->group != NULL;
+	}
+	filename = tomoyo_read_token(param);
+	if (!tomoyo_correct_word(filename))
+		return false;
+	ptr->filename = tomoyo_get_name(filename);
+	return ptr->filename != NULL;
+}
+
+/**
+ * tomoyo_parse_number_union - Parse a tomoyo_number_union.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ * @ptr:   Pointer to "struct tomoyo_number_union".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_parse_number_union(struct tomoyo_acl_param *param,
+			       struct tomoyo_number_union *ptr)
+{
+	char *data;
+	u8 type;
+	unsigned long v;
+
+	memset(ptr, 0, sizeof(*ptr));
+	if (param->data[0] == '@') {
+		param->data++;
+		ptr->group = tomoyo_get_group(param, TOMOYO_NUMBER_GROUP);
+		return ptr->group != NULL;
+	}
+	data = tomoyo_read_token(param);
+	type = tomoyo_parse_ulong(&v, &data);
+	if (type == TOMOYO_VALUE_TYPE_INVALID)
+		return false;
+	ptr->values[0] = v;
+	ptr->value_type[0] = type;
+	if (!*data) {
+		ptr->values[1] = v;
+		ptr->value_type[1] = type;
+		return true;
+	}
+	if (*data++ != '-')
+		return false;
+	type = tomoyo_parse_ulong(&v, &data);
+	if (type == TOMOYO_VALUE_TYPE_INVALID || *data || ptr->values[0] > v)
+		return false;
+	ptr->values[1] = v;
+	ptr->value_type[1] = type;
+	return true;
+}
+
+/**
+ * tomoyo_byte_range - Check whether the string is a \ooo style octal value.
+ *
+ * @str: Pointer to the string.
+ *
+ * Returns true if @str is a \ooo style octal value, false otherwise.
+ *
+ * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF.
+ * This function verifies that \ooo is in valid range.
+ */
+static inline bool tomoyo_byte_range(const char *str)
+{
+	return *str >= '0' && *str++ <= '3' &&
+		*str >= '0' && *str++ <= '7' &&
+		*str >= '0' && *str <= '7';
+}
+
+/**
+ * tomoyo_alphabet_char - Check whether the character is an alphabet.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is an alphabet character, false otherwise.
+ */
+static inline bool tomoyo_alphabet_char(const char c)
+{
+	return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
+}
+
+/**
+ * tomoyo_make_byte - Make byte value from three octal characters.
+ *
+ * @c1: The first character.
+ * @c2: The second character.
+ * @c3: The third character.
+ *
+ * Returns byte value.
+ */
+static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3)
+{
+	return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
+}
+
+/**
+ * tomoyo_valid - Check whether the character is a valid char.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is a valid character, false otherwise.
+ */
+static inline bool tomoyo_valid(const unsigned char c)
+{
+	return c > ' ' && c < 127;
+}
+
+/**
+ * tomoyo_invalid - Check whether the character is an invalid char.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is an invalid character, false otherwise.
+ */
+static inline bool tomoyo_invalid(const unsigned char c)
+{
+	return c && (c <= ' ' || c >= 127);
+}
+
+/**
+ * tomoyo_str_starts - Check whether the given string starts with the given keyword.
+ *
+ * @src:  Pointer to pointer to the string.
+ * @find: Pointer to the keyword.
+ *
+ * Returns true if @src starts with @find, false otherwise.
+ *
+ * The @src is updated to point the first character after the @find
+ * if @src starts with @find.
+ */
+bool tomoyo_str_starts(char **src, const char *find)
+{
+	const int len = strlen(find);
+	char *tmp = *src;
+
+	if (strncmp(tmp, find, len))
+		return false;
+	tmp += len;
+	*src = tmp;
+	return true;
+}
+
+/**
+ * tomoyo_normalize_line - Format string.
+ *
+ * @buffer: The line to normalize.
+ *
+ * Leading and trailing whitespaces are removed.
+ * Multiple whitespaces are packed into single space.
+ *
+ * Returns nothing.
+ */
+void tomoyo_normalize_line(unsigned char *buffer)
+{
+	unsigned char *sp = buffer;
+	unsigned char *dp = buffer;
+	bool first = true;
+
+	while (tomoyo_invalid(*sp))
+		sp++;
+	while (*sp) {
+		if (!first)
+			*dp++ = ' ';
+		first = false;
+		while (tomoyo_valid(*sp))
+			*dp++ = *sp++;
+		while (tomoyo_invalid(*sp))
+			sp++;
+	}
+	*dp = '\0';
+}
+
+/**
+ * tomoyo_correct_word2 - Validate a string.
+ *
+ * @string: The string to check. Maybe non-'\0'-terminated.
+ * @len:    Length of @string.
+ *
+ * Check whether the given string follows the naming rules.
+ * Returns true if @string follows the naming rules, false otherwise.
+ */
+static bool tomoyo_correct_word2(const char *string, size_t len)
+{
+	const char *const start = string;
+	bool in_repetition = false;
+	unsigned char c;
+	unsigned char d;
+	unsigned char e;
+
+	if (!len)
+		goto out;
+	while (len--) {
+		c = *string++;
+		if (c == '\\') {
+			if (!len--)
+				goto out;
+			c = *string++;
+			switch (c) {
+			case '\\':  /* "\\" */
+				continue;
+			case '$':   /* "\$" */
+			case '+':   /* "\+" */
+			case '?':   /* "\?" */
+			case '*':   /* "\*" */
+			case '@':   /* "\@" */
+			case 'x':   /* "\x" */
+			case 'X':   /* "\X" */
+			case 'a':   /* "\a" */
+			case 'A':   /* "\A" */
+			case '-':   /* "\-" */
+				continue;
+			case '{':   /* "/\{" */
+				if (string - 3 < start || *(string - 3) != '/')
+					break;
+				in_repetition = true;
+				continue;
+			case '}':   /* "\}/" */
+				if (*string != '/')
+					break;
+				if (!in_repetition)
+					break;
+				in_repetition = false;
+				continue;
+			case '0':   /* "\ooo" */
+			case '1':
+			case '2':
+			case '3':
+				if (!len-- || !len--)
+					break;
+				d = *string++;
+				e = *string++;
+				if (d < '0' || d > '7' || e < '0' || e > '7')
+					break;
+				c = tomoyo_make_byte(c, d, e);
+				if (c <= ' ' || c >= 127)
+					continue;
+			}
+			goto out;
+		} else if (in_repetition && c == '/') {
+			goto out;
+		} else if (c <= ' ' || c >= 127) {
+			goto out;
+		}
+	}
+	if (in_repetition)
+		goto out;
+	return true;
+ out:
+	return false;
+}
+
+/**
+ * tomoyo_correct_word - Validate a string.
+ *
+ * @string: The string to check.
+ *
+ * Check whether the given string follows the naming rules.
+ * Returns true if @string follows the naming rules, false otherwise.
+ */
+bool tomoyo_correct_word(const char *string)
+{
+	return tomoyo_correct_word2(string, strlen(string));
+}
+
+/**
+ * tomoyo_correct_path2 - Check whether the given pathname follows the naming rules.
+ *
+ * @filename: The pathname to check.
+ * @len:      Length of @filename.
+ *
+ * Returns true if @filename follows the naming rules, false otherwise.
+ */
+static bool tomoyo_correct_path2(const char *filename, const size_t len)
+{
+	const char *cp1 = memchr(filename, '/', len);
+	const char *cp2 = memchr(filename, '.', len);
+
+	return cp1 && (!cp2 || (cp1 < cp2)) && tomoyo_correct_word2(filename, len);
+}
+
+/**
+ * tomoyo_correct_path - Validate a pathname.
+ *
+ * @filename: The pathname to check.
+ *
+ * Check whether the given pathname follows the naming rules.
+ * Returns true if @filename follows the naming rules, false otherwise.
+ */
+bool tomoyo_correct_path(const char *filename)
+{
+	return tomoyo_correct_path2(filename, strlen(filename));
+}
+
+/**
+ * tomoyo_correct_domain - Check whether the given domainname follows the naming rules.
+ *
+ * @domainname: The domainname to check.
+ *
+ * Returns true if @domainname follows the naming rules, false otherwise.
+ */
+bool tomoyo_correct_domain(const unsigned char *domainname)
+{
+	if (!domainname || !tomoyo_domain_def(domainname))
+		return false;
+	domainname = strchr(domainname, ' ');
+	if (!domainname++)
+		return true;
+	while (1) {
+		const unsigned char *cp = strchr(domainname, ' ');
+
+		if (!cp)
+			break;
+		if (!tomoyo_correct_path2(domainname, cp - domainname))
+			return false;
+		domainname = cp + 1;
+	}
+	return tomoyo_correct_path(domainname);
+}
+
+/**
+ * tomoyo_domain_def - Check whether the given token can be a domainname.
+ *
+ * @buffer: The token to check.
+ *
+ * Returns true if @buffer possibly be a domainname, false otherwise.
+ */
+bool tomoyo_domain_def(const unsigned char *buffer)
+{
+	const unsigned char *cp;
+	int len;
+
+	if (*buffer != '<')
+		return false;
+	cp = strchr(buffer, ' ');
+	if (!cp)
+		len = strlen(buffer);
+	else
+		len = cp - buffer;
+	if (buffer[len - 1] != '>' ||
+	    !tomoyo_correct_word2(buffer + 1, len - 2))
+		return false;
+	return true;
+}
+
+/**
+ * tomoyo_find_domain - Find a domain by the given name.
+ *
+ * @domainname: The domainname to find.
+ *
+ * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
+{
+	struct tomoyo_domain_info *domain;
+	struct tomoyo_path_info name;
+
+	name.name = domainname;
+	tomoyo_fill_path_info(&name);
+	list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
+				srcu_read_lock_held(&tomoyo_ss)) {
+		if (!domain->is_deleted &&
+		    !tomoyo_pathcmp(&name, domain->domainname))
+			return domain;
+	}
+	return NULL;
+}
+
+/**
+ * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token.
+ *
+ * @filename: The string to evaluate.
+ *
+ * Returns the initial length without a pattern in @filename.
+ */
+static int tomoyo_const_part_length(const char *filename)
+{
+	char c;
+	int len = 0;
+
+	if (!filename)
+		return 0;
+	while ((c = *filename++) != '\0') {
+		if (c != '\\') {
+			len++;
+			continue;
+		}
+		c = *filename++;
+		switch (c) {
+		case '\\':  /* "\\" */
+			len += 2;
+			continue;
+		case '0':   /* "\ooo" */
+		case '1':
+		case '2':
+		case '3':
+			c = *filename++;
+			if (c < '0' || c > '7')
+				break;
+			c = *filename++;
+			if (c < '0' || c > '7')
+				break;
+			len += 4;
+			continue;
+		}
+		break;
+	}
+	return len;
+}
+
+/**
+ * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members.
+ *
+ * @ptr: Pointer to "struct tomoyo_path_info" to fill in.
+ *
+ * The caller sets "struct tomoyo_path_info"->name.
+ */
+void tomoyo_fill_path_info(struct tomoyo_path_info *ptr)
+{
+	const char *name = ptr->name;
+	const int len = strlen(name);
+
+	ptr->const_len = tomoyo_const_part_length(name);
+	ptr->is_dir = len && (name[len - 1] == '/');
+	ptr->is_patterned = (ptr->const_len < len);
+	ptr->hash = full_name_hash(NULL, name, len);
+}
+
+/**
+ * tomoyo_file_matches_pattern2 - Pattern matching without '/' character and "\-" pattern.
+ *
+ * @filename:     The start of string to check.
+ * @filename_end: The end of string to check.
+ * @pattern:      The start of pattern to compare.
+ * @pattern_end:  The end of pattern to compare.
+ *
+ * Returns true if @filename matches @pattern, false otherwise.
+ */
+static bool tomoyo_file_matches_pattern2(const char *filename,
+					 const char *filename_end,
+					 const char *pattern,
+					 const char *pattern_end)
+{
+	while (filename < filename_end && pattern < pattern_end) {
+		char c;
+		int i;
+		int j;
+
+		if (*pattern != '\\') {
+			if (*filename++ != *pattern++)
+				return false;
+			continue;
+		}
+		c = *filename;
+		pattern++;
+		switch (*pattern) {
+		case '?':
+			if (c == '/') {
+				return false;
+			} else if (c == '\\') {
+				if (filename[1] == '\\')
+					filename++;
+				else if (tomoyo_byte_range(filename + 1))
+					filename += 3;
+				else
+					return false;
+			}
+			break;
+		case '\\':
+			if (c != '\\')
+				return false;
+			if (*++filename != '\\')
+				return false;
+			break;
+		case '+':
+			if (!isdigit(c))
+				return false;
+			break;
+		case 'x':
+			if (!isxdigit(c))
+				return false;
+			break;
+		case 'a':
+			if (!tomoyo_alphabet_char(c))
+				return false;
+			break;
+		case '0':
+		case '1':
+		case '2':
+		case '3':
+			if (c == '\\' && tomoyo_byte_range(filename + 1)
+			    && strncmp(filename + 1, pattern, 3) == 0) {
+				filename += 3;
+				pattern += 2;
+				break;
+			}
+			return false; /* Not matched. */
+		case '*':
+		case '@':
+			for (i = 0; i <= filename_end - filename; i++) {
+				if (tomoyo_file_matches_pattern2(
+						    filename + i, filename_end,
+						    pattern + 1, pattern_end))
+					return true;
+				c = filename[i];
+				if (c == '.' && *pattern == '@')
+					break;
+				if (c != '\\')
+					continue;
+				if (filename[i + 1] == '\\')
+					i++;
+				else if (tomoyo_byte_range(filename + i + 1))
+					i += 3;
+				else
+					break; /* Bad pattern. */
+			}
+			return false; /* Not matched. */
+		default:
+			j = 0;
+			c = *pattern;
+			if (c == '$') {
+				while (isdigit(filename[j]))
+					j++;
+			} else if (c == 'X') {
+				while (isxdigit(filename[j]))
+					j++;
+			} else if (c == 'A') {
+				while (tomoyo_alphabet_char(filename[j]))
+					j++;
+			}
+			for (i = 1; i <= j; i++) {
+				if (tomoyo_file_matches_pattern2(
+						    filename + i, filename_end,
+						    pattern + 1, pattern_end))
+					return true;
+			}
+			return false; /* Not matched or bad pattern. */
+		}
+		filename++;
+		pattern++;
+	}
+	while (*pattern == '\\' &&
+	       (*(pattern + 1) == '*' || *(pattern + 1) == '@'))
+		pattern += 2;
+	return filename == filename_end && pattern == pattern_end;
+}
+
+/**
+ * tomoyo_file_matches_pattern - Pattern matching without '/' character.
+ *
+ * @filename:     The start of string to check.
+ * @filename_end: The end of string to check.
+ * @pattern:      The start of pattern to compare.
+ * @pattern_end:  The end of pattern to compare.
+ *
+ * Returns true if @filename matches @pattern, false otherwise.
+ */
+static bool tomoyo_file_matches_pattern(const char *filename,
+					const char *filename_end,
+					const char *pattern,
+					const char *pattern_end)
+{
+	const char *pattern_start = pattern;
+	bool first = true;
+	bool result;
+
+	while (pattern < pattern_end - 1) {
+		/* Split at "\-" pattern. */
+		if (*pattern++ != '\\' || *pattern++ != '-')
+			continue;
+		result = tomoyo_file_matches_pattern2(filename,
+						      filename_end,
+						      pattern_start,
+						      pattern - 2);
+		if (first)
+			result = !result;
+		if (result)
+			return false;
+		first = false;
+		pattern_start = pattern;
+	}
+	result = tomoyo_file_matches_pattern2(filename, filename_end,
+					      pattern_start, pattern_end);
+	return first ? result : !result;
+}
+
+/**
+ * tomoyo_path_matches_pattern2 - Do pathname pattern matching.
+ *
+ * @f: The start of string to check.
+ * @p: The start of pattern to compare.
+ *
+ * Returns true if @f matches @p, false otherwise.
+ */
+static bool tomoyo_path_matches_pattern2(const char *f, const char *p)
+{
+	const char *f_delimiter;
+	const char *p_delimiter;
+
+	while (*f && *p) {
+		f_delimiter = strchr(f, '/');
+		if (!f_delimiter)
+			f_delimiter = f + strlen(f);
+		p_delimiter = strchr(p, '/');
+		if (!p_delimiter)
+			p_delimiter = p + strlen(p);
+		if (*p == '\\' && *(p + 1) == '{')
+			goto recursive;
+		if (!tomoyo_file_matches_pattern(f, f_delimiter, p,
+						 p_delimiter))
+			return false;
+		f = f_delimiter;
+		if (*f)
+			f++;
+		p = p_delimiter;
+		if (*p)
+			p++;
+	}
+	/* Ignore trailing "\*" and "\@" in @pattern. */
+	while (*p == '\\' &&
+	       (*(p + 1) == '*' || *(p + 1) == '@'))
+		p += 2;
+	return !*f && !*p;
+ recursive:
+	/*
+	 * The "\{" pattern is permitted only after '/' character.
+	 * This guarantees that below "*(p - 1)" is safe.
+	 * Also, the "\}" pattern is permitted only before '/' character
+	 * so that "\{" + "\}" pair will not break the "\-" operator.
+	 */
+	if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' ||
+	    *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\')
+		return false; /* Bad pattern. */
+	do {
+		/* Compare current component with pattern. */
+		if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2,
+						 p_delimiter - 2))
+			break;
+		/* Proceed to next component. */
+		f = f_delimiter;
+		if (!*f)
+			break;
+		f++;
+		/* Continue comparison. */
+		if (tomoyo_path_matches_pattern2(f, p_delimiter + 1))
+			return true;
+		f_delimiter = strchr(f, '/');
+	} while (f_delimiter);
+	return false; /* Not matched. */
+}
+
+/**
+ * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern.
+ *
+ * @filename: The filename to check.
+ * @pattern:  The pattern to compare.
+ *
+ * Returns true if matches, false otherwise.
+ *
+ * The following patterns are available.
+ *   \\     \ itself.
+ *   \ooo   Octal representation of a byte.
+ *   \*     Zero or more repetitions of characters other than '/'.
+ *   \@     Zero or more repetitions of characters other than '/' or '.'.
+ *   \?     1 byte character other than '/'.
+ *   \$     One or more repetitions of decimal digits.
+ *   \+     1 decimal digit.
+ *   \X     One or more repetitions of hexadecimal digits.
+ *   \x     1 hexadecimal digit.
+ *   \A     One or more repetitions of alphabet characters.
+ *   \a     1 alphabet character.
+ *
+ *   \-     Subtraction operator.
+ *
+ *   /\{dir\}/   '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/
+ *               /dir/dir/dir/ ).
+ */
+bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
+				 const struct tomoyo_path_info *pattern)
+{
+	const char *f = filename->name;
+	const char *p = pattern->name;
+	const int len = pattern->const_len;
+
+	/* If @pattern doesn't contain pattern, I can use strcmp(). */
+	if (!pattern->is_patterned)
+		return !tomoyo_pathcmp(filename, pattern);
+	/* Don't compare directory and non-directory. */
+	if (filename->is_dir != pattern->is_dir)
+		return false;
+	/* Compare the initial length without patterns. */
+	if (strncmp(f, p, len))
+		return false;
+	f += len;
+	p += len;
+	return tomoyo_path_matches_pattern2(f, p);
+}
+
+/**
+ * tomoyo_get_exe - Get tomoyo_realpath() of current process.
+ *
+ * Returns the tomoyo_realpath() of current process on success, NULL otherwise.
+ *
+ * This function uses kzalloc(), so the caller must call kfree()
+ * if this function didn't return NULL.
+ */
+const char *tomoyo_get_exe(void)
+{
+	struct file *exe_file;
+	const char *cp;
+	struct mm_struct *mm = current->mm;
+
+	if (!mm)
+		return NULL;
+	exe_file = get_mm_exe_file(mm);
+	if (!exe_file)
+		return NULL;
+
+	cp = tomoyo_realpath_from_path(&exe_file->f_path);
+	fput(exe_file);
+	return cp;
+}
+
+/**
+ * tomoyo_get_mode - Get MAC mode.
+ *
+ * @ns:      Pointer to "struct tomoyo_policy_namespace".
+ * @profile: Profile number.
+ * @index:   Index number of functionality.
+ *
+ * Returns mode.
+ */
+int tomoyo_get_mode(const struct tomoyo_policy_namespace *ns, const u8 profile,
+		    const u8 index)
+{
+	u8 mode;
+	struct tomoyo_profile *p;
+
+	if (!tomoyo_policy_loaded)
+		return TOMOYO_CONFIG_DISABLED;
+	p = tomoyo_profile(ns, profile);
+	mode = p->config[index];
+	if (mode == TOMOYO_CONFIG_USE_DEFAULT)
+		mode = p->config[tomoyo_index2category[index]
+				 + TOMOYO_MAX_MAC_INDEX];
+	if (mode == TOMOYO_CONFIG_USE_DEFAULT)
+		mode = p->default_config;
+	return mode & 3;
+}
+
+/**
+ * tomoyo_init_request_info - Initialize "struct tomoyo_request_info" members.
+ *
+ * @r:      Pointer to "struct tomoyo_request_info" to initialize.
+ * @domain: Pointer to "struct tomoyo_domain_info". NULL for tomoyo_domain().
+ * @index:  Index number of functionality.
+ *
+ * Returns mode.
+ */
+int tomoyo_init_request_info(struct tomoyo_request_info *r,
+			     struct tomoyo_domain_info *domain, const u8 index)
+{
+	u8 profile;
+
+	memset(r, 0, sizeof(*r));
+	if (!domain)
+		domain = tomoyo_domain();
+	r->domain = domain;
+	profile = domain->profile;
+	r->profile = profile;
+	r->type = index;
+	r->mode = tomoyo_get_mode(domain->ns, profile, index);
+	return r->mode;
+}
+
+/**
+ * tomoyo_domain_quota_is_ok - Check for domain's quota.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ *
+ * Returns true if the domain is not exceeded quota, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
+{
+	unsigned int count = 0;
+	struct tomoyo_domain_info *domain = r->domain;
+	struct tomoyo_acl_info *ptr;
+
+	if (r->mode != TOMOYO_CONFIG_LEARNING)
+		return false;
+	if (!domain)
+		return true;
+	if (READ_ONCE(domain->flags[TOMOYO_DIF_QUOTA_WARNED]))
+		return false;
+	list_for_each_entry_rcu(ptr, &domain->acl_info_list, list,
+				srcu_read_lock_held(&tomoyo_ss)) {
+		u16 perm;
+
+		if (ptr->is_deleted)
+			continue;
+		/*
+		 * Reading perm bitmap might race with tomoyo_merge_*() because
+		 * caller does not hold tomoyo_policy_lock mutex. But exceeding
+		 * max_learning_entry parameter by a few entries does not harm.
+		 */
+		switch (ptr->type) {
+		case TOMOYO_TYPE_PATH_ACL:
+			perm = data_race(container_of(ptr, struct tomoyo_path_acl, head)->perm);
+			break;
+		case TOMOYO_TYPE_PATH2_ACL:
+			perm = data_race(container_of(ptr, struct tomoyo_path2_acl, head)->perm);
+			break;
+		case TOMOYO_TYPE_PATH_NUMBER_ACL:
+			perm = data_race(container_of(ptr, struct tomoyo_path_number_acl, head)
+				  ->perm);
+			break;
+		case TOMOYO_TYPE_MKDEV_ACL:
+			perm = data_race(container_of(ptr, struct tomoyo_mkdev_acl, head)->perm);
+			break;
+		case TOMOYO_TYPE_INET_ACL:
+			perm = data_race(container_of(ptr, struct tomoyo_inet_acl, head)->perm);
+			break;
+		case TOMOYO_TYPE_UNIX_ACL:
+			perm = data_race(container_of(ptr, struct tomoyo_unix_acl, head)->perm);
+			break;
+		case TOMOYO_TYPE_MANUAL_TASK_ACL:
+			perm = 0;
+			break;
+		default:
+			perm = 1;
+		}
+		count += hweight16(perm);
+	}
+	if (count < tomoyo_profile(domain->ns, domain->profile)->
+	    pref[TOMOYO_PREF_MAX_LEARNING_ENTRY])
+		return true;
+	WRITE_ONCE(domain->flags[TOMOYO_DIF_QUOTA_WARNED], true);
+	/* r->granted = false; */
+	tomoyo_write_log(r, "%s", tomoyo_dif[TOMOYO_DIF_QUOTA_WARNED]);
+#ifndef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
+	pr_warn("WARNING: Domain '%s' has too many ACLs to hold. Stopped learning mode.\n",
+		domain->domainname->name);
+#endif
+	return false;
+}