[TOMOYO #9 (2.6.27-rc7-mm1) 3/6] Common functions for TOMOYO Linux.

Kentaro Takeda
2008-09-24T09:06:30Z

This file contains common functions (e.g. policy I/O, pattern matching).

Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Toshiharu Harada <haradats@nttdata.co.jp>
---
security/tomoyo/common.c | 2207 +++++++++++++++++++++++++++++++++++++++++++++++
security/tomoyo/common.h | 398 ++++++++
2 files changed, 2605 insertions(+)

--- /dev/null
+++ linux-2.6.27-rc7-mm1/security/tomoyo/common.c
@@ -0,0 +1,2207 @@
+/*
+ * security/tomoyo/common.c
+ *
+ * Common functions for TOMOYO.
+ *
+ * Copyright (C) 2005-2008 NTT DATA CORPORATION
+ *
+ * Version: 2.2.0-pre 2008/09/24
+ *
+ */
+
+#include <linux/uaccess.h>
+#include <linux/security.h>
+#include <linux/hardirq.h>
+#include "realpath.h"
+#include "common.h"
+#include "tomoyo.h"
+
+/* Set default specified by the kernel config. */
+#define MAX_ACCEPT_ENTRY 2048
+
+/* Has /sbin/init started? */
+bool sbin_init_started;
+
+/* String table for functionality that takes 4 modes. */
+static const char *mode_4[4] = {
+ "disabled", "learning", "permissive", "enforcing"
+};
+/* String table for functionality that takes 2 modes. */
+static const char *mode_2[4] = {
+ "disabled", "enabled", "enabled", "enabled"
+};
+
+/* Table for profile. */
+static struct {
+ const char *keyword;
+ unsigned int current_value;
+ const unsigned int max_value;
+} tmy_control_array[TMY_MAX_CONTROL_INDEX] = {
+ [TMY_TOMOYO_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 },
+ [TMY_TOMOYO_MAX_ACCEPT_ENTRY]
+ = { "MAX_ACCEPT_ENTRY", MAX_ACCEPT_ENTRY, INT_MAX },
+ [TMY_TOMOYO_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 },
+};
+
+/* Profile table. Memory is allocated as needed. */
+static struct profile {
+ unsigned int value[TMY_MAX_CONTROL_INDEX];
+ const struct path_info *comment;
+} *profile_ptr[MAX_PROFILES];
+
+/* Permit policy management by non-root user? */
+static bool manage_by_non_root;
+
+/* Utility functions. */
+
+/* Open operation for /sys/kernel/security/tomoyo/ interface. */
+static int tmy_open_control(const u8 type, struct file *file);
+/* Close /sys/kernel/security/tomoyo/ interface. */
+static int tmy_close_control(struct file *file);
+/* Read operation for /sys/kernel/security/tomoyo/ interface. */
+static int tmy_read_control(struct file *file, char __user *buffer,
+ const int buffer_len);
+/* Write operation for /sys/kernel/security/tomoyo/ interface. */
+static int tmy_write_control(struct file *file, const char __user *buffer,
+ const int buffer_len);
+
+/**
+ * is_byte_range - Check whether the string isa \ooo style octal value.
+ *
+ * @str: Pointer to the string.
+ *
+ * Returns true if @str is a \ooo style octal value, false otherwise.
+ */
+static bool is_byte_range(const char *str)
+{
+ return *str >= '0' && *str++ <= '3' &&
+ *str >= '0' && *str++ <= '7' &&
+ *str >= '0' && *str <= '7';
+}
+
+/**
+ * is_decimal - Check whether the character is a decimal character.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is a decimal character, false otherwise.
+ */
+static bool is_decimal(const char c)
+{
+ return c >= '0' && c <= '9';
+}
+
+/**
+ * is_hexadecimal - Check whether the character is a hexadecimal character.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is a hexadecimal character, false otherwise.
+ */
+static bool is_hexadecimal(const char c)
+{
+ return (c >= '0' && c <= '9') ||
+ (c >= 'A' && c <= 'F') ||
+ (c >= 'a' && c <= 'f');
+}
+
+/**
+ * is_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 bool is_alphabet_char(const char c)
+{
+ return (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f');
+}
+
+/**
+ * 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 u8 make_byte(const u8 c1, const u8 c2, const u8 c3)
+{
+ return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
+}
+
+/**
+ * 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.
+ */
+static bool 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;
+}
+
+/**
+ * normalize_line - Format string.
+ *
+ * @buffer: The line to normalize.
+ *
+ * Leading and trailing whitespaces are removed.
+ * Multiple whitespaces are packed into single space.
+ *
+ * Returns nothing.
+ */
+static void normalize_line(unsigned char *buffer)
+{
+ unsigned char *sp = buffer;
+ unsigned char *dp = buffer;
+ bool first = true;
+ while (*sp && (*sp <= ' ' || *sp >= 127))
+ sp++;
+ while (*sp) {
+ if (!first)
+ *dp++ = ' ';
+ first = false;
+ while (*sp > ' ' && *sp < 127)
+ *dp++ = *sp++;
+ while (*sp && (*sp <= ' ' || *sp >= 127))
+ sp++;
+ }
+ *dp = '\0';
+}
+
+/**
+ * tmy_is_correct_path - Validate a pathname.
+ * @filename: The pathname to check.
+ * @start_type: Should the pathname start with '/'?
+ * 1 = must / -1 = must not / 0 = don't care
+ * @pattern_type: Can the pathname contain a wildcard?
+ * 1 = must / -1 = must not / 0 = don't care
+ * @end_type: Should the pathname end with '/'?
+ * 1 = must / -1 = must not / 0 = don't care
+ * @function: The name of function calling me.
+ *
+ * Check whether the given filename follows the naming rules.
+ * Returns true if @filename follows the naming rules, false otherwise.
+ */
+bool tmy_is_correct_path(const char *filename, const s8 start_type,
+ const s8 pattern_type, const s8 end_type,
+ const char *function)
+{
+ bool contains_pattern = false;
+ unsigned char c;
+ unsigned char d;
+ unsigned char e;
+ const char *original_filename = filename;
+ if (!filename)
+ goto out;
+ c = *filename;
+ if (start_type == 1) { /* Must start with '/' */
+ if (c != '/')
+ goto out;
+ } else if (start_type == -1) { /* Must not start with '/' */
+ if (c == '/')
+ goto out;
+ }
+ if (c)
+ c = *(strchr(filename, '\0') - 1);
+ if (end_type == 1) { /* Must end with '/' */
+ if (c != '/')
+ goto out;
+ } else if (end_type == -1) { /* Must not end with '/' */
+ if (c == '/')
+ goto out;
+ }
+ while ((c = *filename++) != '\0') {
+ if (c == '\\') {
+ switch ((c = *filename++)) {
+ case '\\': /* "\\" */
+ continue;
+ case '$': /* "\$" */
+ case '+': /* "\+" */
+ case '?': /* "\?" */
+ case '*': /* "\*" */
+ case '@': /* "\@" */
+ case 'x': /* "\x" */
+ case 'X': /* "\X" */
+ case 'a': /* "\a" */
+ case 'A': /* "\A" */
+ case '-': /* "\-" */
+ if (pattern_type == -1)
+ break; /* Must not contain pattern */
+ contains_pattern = true;
+ continue;
+ case '0': /* "\ooo" */
+ case '1':
+ case '2':
+ case '3':
+ d = *filename++;
+ if (d < '0' || d > '7')
+ break;
+ e = *filename++;
+ if (e < '0' || e > '7')
+ break;
+ c = make_byte(c, d, e);
+ if (c && (c <= ' ' || c >= 127))
+ continue; /* pattern is not \000 */
+ }
+ goto out;
+ } else if (c <= ' ' || c >= 127) {
+ goto out;
+ }
+ }
+ if (pattern_type == 1) { /* Must contain pattern */
+ if (!contains_pattern)
+ goto out;
+ }
+ return true;
+out:
+ printk(KERN_DEBUG "%s: Invalid pathname '%s'\n", function,
+ original_filename);
+ return false;
+}
+
+/**
+ * tmy_is_correct_domain - Check whether the given domainname follows the naming rules.
+ * @domainname: The domainname to check.
+ * @function: The name of function calling me.
+ *
+ * Returns true if @domainname follows the naming rules, false otherwise.
+ */
+bool tmy_is_correct_domain(const unsigned char *domainname,
+ const char *function)
+{
+ unsigned char c;
+ unsigned char d;
+ unsigned char e;
+ const char *org_domainname = domainname;
+ if (!domainname || strncmp(domainname, ROOT_NAME, ROOT_NAME_LEN))
+ goto out;
+ domainname += ROOT_NAME_LEN;
+ if (!*domainname)
+ return true;
+ do {
+ if (*domainname++ != ' ')
+ goto out;
+ if (*domainname++ != '/')
+ goto out;
+ while ((c = *domainname) != '\0' && c != ' ') {
+ domainname++;
+ if (c == '\\') {
+ c = *domainname++;
+ switch ((c)) {
+ case '\\': /* "\\" */
+ continue;
+ case '0': /* "\ooo" */
+ case '1':
+ case '2':
+ case '3':
+ d = *domainname++;
+ if (d < '0' || d > '7')
+ break;
+ e = *domainname++;
+ if (e < '0' || e > '7')
+ break;
+ c = make_byte(c, d, e);
+ if (c && (c <= ' ' || c >= 127))
+ /* pattern is not \000 */
+ continue;
+ }
+ goto out;
+ } else if (c < ' ' || c >= 127) {
+ goto out;
+ }
+ }
+ } while (*domainname);
+ return true;
+out:
+ printk(KERN_DEBUG "%s: Invalid domainname '%s'\n", function,
+ org_domainname);
+ return false;
+}
+
+/**
+ * tmy_is_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 tmy_is_domain_def(const unsigned char *buffer)
+{
+ return !strncmp(buffer, ROOT_NAME, ROOT_NAME_LEN);
+}
+
+/**
+ * tmy_find_domain - Find a domain by the given name.
+ *
+ * @domainname: The domainname to find.
+ *
+ * Returns pointer to "struct domain_info" if found, NULL otherwise.
+ */
+struct domain_info *tmy_find_domain(const char *domainname)
+{
+ struct domain_info *domain;
+ struct path_info name;
+ name.name = domainname;
+ tmy_fill_path_info(&name);
+ list1_for_each_entry(domain, &domain_list, list) {
+ if (!domain->is_deleted &&
+ !tmy_pathcmp(&name, domain->domainname))
+ return domain;
+ }
+ return NULL;
+}
+
+/**
+ * path_depth - Evaluate the number of '/' in a string.
+ *
+ * @pathname: The string to evaluate.
+ *
+ * Returns path depth of the string.
+ *
+ * I score 2 for each of the '/' in the @pathname
+ * and score 1 if the @pathname ends with '/'.
+ */
+static int path_depth(const char *pathname)
+{
+ int i = 0;
+ if (pathname) {
+ char *ep = strchr(pathname, '\0');
+ if (pathname < ep--) {
+ if (*ep != '/')
+ i++;
+ while (pathname <= ep)
+ if (*ep-- == '/')
+ i += 2;
+ }
+ }
+ return i;
+}
+
+/**
+ * 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 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;
+}
+
+/**
+ * tmy_fill_path_info - Fill in "struct path_info" members.
+ *
+ * @ptr: Pointer to "struct path_info" to fill in.
+ *
+ * The caller sets "struct path_info"->name.
+ */
+void tmy_fill_path_info(struct path_info *ptr)
+{
+ const char *name = ptr->name;
+ const int len = strlen(name);
+ ptr->total_len = len;
+ ptr->const_len = const_part_length(name);
+ ptr->is_dir = len && (name[len - 1] == '/');
+ ptr->is_patterned = (ptr->const_len < len);
+ ptr->hash = full_name_hash(name, len);
+ ptr->depth = path_depth(name);
+}
+
+/**
+ * file_matches_to_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 file_matches_to_pattern2(const char *filename,
+ const char *filename_end,
+ const char *pattern,
+ const char *pattern_end)
+{
+ while (filename < filename_end && pattern < pattern_end) {
+ char c;
+ if (*pattern != '\\') {
+ if (*filename++ != *pattern++)
+ return false;
+ continue;
+ }
+ c = *filename;
+ pattern++;
+ switch (*pattern) {
+ int i;
+ int j;
+ case '?':
+ if (c == '/') {
+ return false;
+ } else if (c == '\\') {
+ if (filename[1] == '\\')
+ filename++;
+ else if (is_byte_range(filename + 1))
+ filename += 3;
+ else
+ return false;
+ }
+ break;
+ case '\\':
+ if (c != '\\')
+ return false;
+ if (*++filename != '\\')
+ return false;
+ break;
+ case '+':
+ if (!is_decimal(c))
+ return false;
+ break;
+ case 'x':
+ if (!is_hexadecimal(c))
+ return false;
+ break;
+ case 'a':
+ if (!is_alphabet_char(c))
+ return false;
+ break;
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ if (c == '\\' && is_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 (file_matches_to_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 (is_byte_range(filename + i + 1))
+ i += 3;
+ else
+ break; /* Bad pattern. */
+ }
+ return false; /* Not matched. */
+ default:
+ j = 0;
+ c = *pattern;
+ if (c == '$') {
+ while (is_decimal(filename[j]))
+ j++;
+ } else if (c == 'X') {
+ while (is_hexadecimal(filename[j]))
+ j++;
+ } else if (c == 'A') {
+ while (is_alphabet_char(filename[j]))
+ j++;
+ }
+ for (i = 1; i <= j; i++) {
+ if (file_matches_to_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;
+}
+
+/**
+ * file_matches_to_pattern - Pattern matching without 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 file_matches_to_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 = file_matches_to_pattern2(filename, filename_end,
+ pattern_start, pattern - 2);
+ if (first)
+ result = !result;
+ if (result)
+ return false;
+ first = false;
+ pattern_start = pattern;
+ }
+ result = file_matches_to_pattern2(filename, filename_end,
+ pattern_start, pattern_end);
+ return first ? result : !result;
+}
+
+/**
+ * tmy_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.
+ * \* More than or equals to 0 character other than '/'.
+ * \@ More than or equals to 0 character other than '/' or '.'.
+ * \? 1 byte character other than '/'.
+ * \$ More than or equals to 1 decimal digit.
+ * \+ 1 decimal digit.
+ * \X More than or equals to 1 hexadecimal digit.
+ * \x 1 hexadecimal digit.
+ * \A More than or equals to 1 alphabet character.
+ * \a 1 alphabet character.
+ * \- Subtraction operator.
+ */
+bool tmy_path_matches_pattern(const struct path_info *filename,
+ const struct path_info *pattern)
+{
+ /*
+ if (!filename || !pattern)
+ return false;
+ */
+ 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 !tmy_pathcmp(filename, pattern);
+ /* Dont compare if the number of '/' differs. */
+ if (filename->depth != pattern->depth)
+ return false;
+ /* Compare the initial length without patterns. */
+ if (strncmp(f, p, len))
+ return false;
+ f += len;
+ p += len;
+ /* Main loop. Compare each directory component. */
+ while (*f && *p) {
+ const char *f_delimiter = strchr(f, '/');
+ const char *p_delimiter = strchr(p, '/');
+ if (!f_delimiter)
+ f_delimiter = strchr(f, '\0');
+ if (!p_delimiter)
+ p_delimiter = strchr(p, '\0');
+ if (!file_matches_to_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;
+}
+
+/**
+ * tmy_io_printf - Transactional printf() to "struct tmy_io_buffer" structure.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ * @fmt: The printf()'s format string, followed by parameters.
+ *
+ * Returns true on success, false otherwise.
+ *
+ * The snprintf() will truncate, but tmy_io_printf() won't.
+ */
+bool tmy_io_printf(struct tmy_io_buffer *head, const char *fmt, ...)
+{
+ va_list args;
+ int len;
+ int pos = head->read_avail;
+ int size = head->readbuf_size - pos;
+ if (size <= 0)
+ return false;
+ va_start(args, fmt);
+ len = vsnprintf(head->read_buf + pos, size, fmt, args);
+ va_end(args);
+ if (pos + len >= head->readbuf_size)
+ return false;
+ head->read_avail += len;
+ return true;
+}
+
+/**
+ * tmy_get_exe - Get tmy_realpath() of current process.
+ *
+ * Returns the tmy_realpath() of current process on success, NULL otherwise.
+ *
+ * This function uses tmy_alloc(), so the caller must tmy_free()
+ * if this function didn't return NULL.
+ */
+static const char *tmy_get_exe(void)
+{
+ struct mm_struct *mm = current->mm;
+ struct vm_area_struct *vma;
+ const char *cp = NULL;
+ if (!mm)
+ return NULL;
+ down_read(&mm->mmap_sem);
+ for (vma = mm->mmap; vma; vma = vma->vm_next) {
+ if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
+ cp = tmy_realpath_from_dentry(vma->vm_file->f_dentry,
+ vma->vm_file->f_vfsmnt);
+ break;
+ }
+ }
+ up_read(&mm->mmap_sem);
+ return cp;
+}
+
+/**
+ * tmy_get_msg - Get warning message.
+ *
+ * @is_enforce: Is it enforcing mode?
+ *
+ * Returns "ERROR" or "WARNING".
+ */
+const char *tmy_get_msg(const bool is_enforce)
+{
+ if (is_enforce)
+ return "ERROR";
+ else
+ return "WARNING";
+}
+
+/**
+ * tmy_check_flags_no_sleep_check - Check mode for specified functionality.
+ *
+ * @index: The functionality to check mode.
+ *
+ * Returns the mode of specified functionality.
+ */
+static unsigned int tmy_check_flags_no_sleep_check(const u8 index)
+{
+ const u8 profile = tmy_domain(current)->profile;
+ return sbin_init_started && index < TMY_MAX_CONTROL_INDEX
+#if MAX_PROFILES != 256
+ && profile < MAX_PROFILES
+#endif
+ && profile_ptr[profile] ?
+ profile_ptr[profile]->value[index] : 0;
+}
+
+/**
+ * sleep_check - Check whether it is permitted to do operations that may sleep.
+ *
+ * Returns true if it is permitted to do operations that may sleep,
+ * false otherwise.
+ *
+ * TOMOYO Linux supports interactive enforcement that lets processes
+ * wait for the administrator's decision.
+ * All hooks but the one for tmy_may_autobind() are inserted where
+ * it is permitted to do operations that may sleep.
+ * Thus, this warning should not happen.
+ */
+static bool sleep_check(void)
+{
+ static u8 count = 20;
+ if (likely(!in_interrupt()))
+ return true;
+ if (count) {
+ count--;
+ printk(KERN_ERR "BUG: sleeping function called "
+ "from invalid context.\n");
+ dump_stack();
+ }
+ return false;
+}
+
+/**
+ * tmy_check_flags - Check mode for specified functionality.
+ *
+ * @index: The functionality to check mode.
+ *
+ * Returns the mode of specified functionality.
+ */
+unsigned int tmy_check_flags(const u8 index)
+{
+ return sleep_check() ? tmy_check_flags_no_sleep_check(index) : 0;
+}
+
+/**
+ * tmy_verbose_mode - Check whether TOMOYO is verbose mode.
+ *
+ * Returns true if domain policy violation warning should be printed to
+ * console.
+ */
+bool tmy_verbose_mode(void)
+{
+ return tmy_check_flags(TMY_TOMOYO_VERBOSE) != 0;
+}
+
+/**
+ * tmy_check_domain_quota - Check for domain's quota.
+ *
+ * @domain: Pointer to "struct domain_info".
+ *
+ * Returns true if the domain is not exceeded quota, false otherwise.
+ */
+bool tmy_check_domain_quota(struct domain_info * const domain)
+{
+ unsigned int count = 0;
+ struct acl_info *ptr;
+ if (!domain)
+ return true;
+ list1_for_each_entry(ptr, &domain->acl_info_list, list) {
+ if (ptr->type & ACL_DELETED)
+ continue;
+ switch (tmy_acl_type2(ptr)) {
+ struct single_path_acl_record *acl1;
+ struct double_path_acl_record *acl2;
+ u16 perm;
+ case TYPE_SINGLE_PATH_ACL:
+ acl1 = container_of(ptr, struct single_path_acl_record,
+ head);
+ perm = acl1->perm;
+ if (perm & (1 << TMY_TYPE_EXECUTE_ACL))
+ count++;
+ if (perm &
+ ((1 << TMY_TYPE_READ_ACL) |
+ (1 << TMY_TYPE_WRITE_ACL)))
+ count++;
+ if (perm & (1 << TMY_TYPE_CREATE_ACL))
+ count++;
+ if (perm & (1 << TMY_TYPE_UNLINK_ACL))
+ count++;
+ if (perm & (1 << TMY_TYPE_MKDIR_ACL))
+ count++;
+ if (perm & (1 << TMY_TYPE_RMDIR_ACL))
+ count++;
+ if (perm & (1 << TMY_TYPE_MKFIFO_ACL))
+ count++;
+ if (perm & (1 << TMY_TYPE_MKSOCK_ACL))
+ count++;
+ if (perm & (1 << TMY_TYPE_MKBLOCK_ACL))
+ count++;
+ if (perm & (1 << TMY_TYPE_MKCHAR_ACL))
+ count++;
+ if (perm & (1 << TMY_TYPE_TRUNCATE_ACL))
+ count++;
+ if (perm & (1 << TMY_TYPE_SYMLINK_ACL))
+ count++;
+ if (perm & (1 << TMY_TYPE_REWRITE_ACL))
+ count++;
+ break;
+ case TYPE_DOUBLE_PATH_ACL:
+ acl2 = container_of(ptr, struct double_path_acl_record,
+ head);
+ perm = acl2->perm;
+ if (perm & (1 << TMY_TYPE_LINK_ACL))
+ count++;
+ if (perm & (1 << TMY_TYPE_RENAME_ACL))
+ count++;
+ break;
+ }
+ }
+ if (count < tmy_check_flags(TMY_TOMOYO_MAX_ACCEPT_ENTRY))
+ return true;
+ if (!domain->quota_warned) {
+ domain->quota_warned = true;
+ printk(KERN_WARNING "TOMOYO-WARNING: "
+ "Domain '%s' has so many ACLs to hold. "
+ "Stopped learning mode.\n", domain->domainname->name);
+ }
+ return false;
+}
+
+/**
+ * tmy_find_or_assign_new_profile - Create a new profile.
+ *
+ * @profile: Profile number to create.
+ *
+ * Returns pointer to "struct profile" on success, NULL otherwise.
+ */
+static struct profile *tmy_find_or_assign_new_profile(const unsigned int
+ profile)
+{
+ static DEFINE_MUTEX(profile_lock);
+ struct profile *ptr = NULL;
+ mutex_lock(&profile_lock);
+ if (profile < MAX_PROFILES) {
+ ptr = profile_ptr[profile];
+ if (ptr)
+ goto ok;
+ ptr = tmy_alloc_element(sizeof(*ptr));
+ if (ptr) {
+ int i;
+ for (i = 0; i < TMY_MAX_CONTROL_INDEX; i++)
+ ptr->value[i]
+ = tmy_control_array[i].current_value;
+ mb(); /* Avoid out-of-order execution. */
+ profile_ptr[profile] = ptr;
+ }
+ }
+ok:
+ mutex_unlock(&profile_lock);
+ return ptr;
+}
+
+/**
+ * write_profile - Write profile table.
+ *
+ * @head: Pointer to "struct tmy_io_buffer"
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int write_profile(struct tmy_io_buffer *head)
+{
+ char *data = head->write_buf;
+ unsigned int i;
+ unsigned int value;
+ char *cp;
+ struct profile *profile;
+ unsigned long num;
+ cp = strchr(data, '-');
+ if (cp)
+ *cp = '\0';
+ if (strict_strtoul(data, 10, &num))
+ return -EINVAL;
+ if (cp)
+ data = cp + 1;
+ profile = tmy_find_or_assign_new_profile(num);
+ if (!profile)
+ return -EINVAL;
+ cp = strchr(data, '=');
+ if (!cp)
+ return -EINVAL;
+ *cp = '\0';
+ tmy_update_counter(TMY_UPDATES_COUNTER_PROFILE);
+ if (!strcmp(data, "COMMENT")) {
+ profile->comment = tmy_save_name(cp + 1);
+ return 0;
+ }
+ for (i = 0; i < TMY_MAX_CONTROL_INDEX; i++) {
+ if (strcmp(data, tmy_control_array[i].keyword))
+ continue;
+ if (sscanf(cp + 1, "%u", &value) != 1) {
+ int j;
+ const char **modes;
+ switch (i) {
+ case TMY_TOMOYO_VERBOSE:
+ modes = mode_2;
+ break;
+ default:
+ modes = mode_4;
+ break;
+ }
+ for (j = 0; j < 4; j++) {
+ if (strcmp(cp + 1, modes[j]))
+ continue;
+ value = j;
+ break;
+ }
+ if (j == 4)
+ return -EINVAL;
+ } else if (value > tmy_control_array[i].max_value) {
+ value = tmy_control_array[i].max_value;
+ }
+ profile->value[i] = value;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+/**
+ * read_profile - Read profile table.
+ *
+ * @head: Pointer to "struct tmy_io_buffer"
+ *
+ * Returns 0.
+ */
+static int read_profile(struct tmy_io_buffer *head)
+{
+ static const int total
+ = TMY_MAX_CONTROL_INDEX + 1;
+ int step;
+ if (head->read_eof)
+ return 0;
+ for (step = head->read_step; step < MAX_PROFILES * total; step++) {
+ const u8 index = step / total;
+ u8 type = step % total;
+ const struct profile *profile = profile_ptr[index];
+ head->read_step = step;
+ if (!profile)
+ continue;
+ if (!type) { /* Print profile' comment tag. */
+ if (!tmy_io_printf(head, "%u-COMMENT=%s\n",
+ index, profile->comment ?
+ profile->comment->name : ""))
+ break;
+ continue;
+ }
+ type--;
+ if (type < TMY_MAX_CONTROL_INDEX) {
+ const unsigned int value = profile->value[type];
+ const char **modes = NULL;
+ const char *keyword = tmy_control_array[type].keyword;
+ switch (tmy_control_array[type].max_value) {
+ case 3:
+ modes = mode_4;
+ break;
+ case 1:
+ modes = mode_2;
+ break;
+ }
+ if (modes) {
+ if (!tmy_io_printf(head, "%u-%s=%s\n", index,
+ keyword, modes[value]))
+ break;
+ } else {
+ if (!tmy_io_printf(head, "%u-%s=%u\n", index,
+ keyword, value))
+ break;
+ }
+ }
+ }
+ if (step == MAX_PROFILES * total)
+ head->read_eof = true;
+ return 0;
+}
+
+/* Structure for policy manager. */
+struct policy_manager_entry {
+ struct list1_head list;
+ /* A path to program or a domainname. */
+ const struct path_info *manager;
+ bool is_domain; /* True if manager is a domainname. */
+ bool is_deleted; /* True if this entry is deleted. */
+};
+
+/* The list for "struct policy_manager_entry". */
+static LIST1_HEAD(policy_manager_list);
+
+/**
+ * update_manager_entry - Add a manager entry.
+ *
+ * @manager: The path to manager or the domainnamme.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int update_manager_entry(const char *manager, const bool is_delete)
+{
+ struct policy_manager_entry *new_entry;
+ struct policy_manager_entry *ptr;
+ static DEFINE_MUTEX(lock);
+ const struct path_info *saved_manager;
+ int error = -ENOMEM;
+ bool is_domain = false;
+ if (tmy_is_domain_def(manager)) {
+ if (!tmy_is_correct_domain(manager, __func__))
+ return -EINVAL;
+ is_domain = true;
+ } else {
+ if (!tmy_is_correct_path(manager, 1, -1, -1, __func__))
+ return -EINVAL;
+ }
+ saved_manager = tmy_save_name(manager);
+ if (!saved_manager)
+ return -ENOMEM;
+ mutex_lock(&lock);
+ list1_for_each_entry(ptr, &policy_manager_list, list) {
+ if (ptr->manager != saved_manager)
+ continue;
+ ptr->is_deleted = is_delete;
+ error = 0;
+ goto out;
+ }
+ if (is_delete) {
+ error = -ENOENT;
+ goto out;
+ }
+ new_entry = tmy_alloc_element(sizeof(*new_entry));
+ if (!new_entry)
+ goto out;
+ new_entry->manager = saved_manager;
+ new_entry->is_domain = is_domain;
+ list1_add_tail_mb(&new_entry->list, &policy_manager_list);
+ error = 0;
+out:
+ mutex_unlock(&lock);
+ if (!error)
+ tmy_update_counter(TMY_UPDATES_COUNTER_MANAGER);
+ return error;
+}
+
+/**
+ * write_manager_policy - Write manager policy.
+ *
+ * @head: Pointer to "struct tmy_io_buffer"
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int write_manager_policy(struct tmy_io_buffer *head)
+{
+ char *data = head->write_buf;
+ bool is_delete = str_starts(&data, KEYWORD_DELETE);
+ if (!strcmp(data, "manage_by_non_root")) {
+ manage_by_non_root = !is_delete;
+ return 0;
+ }
+ return update_manager_entry(data, is_delete);
+}
+
+/**
+ * read_manager_policy - Read manager policy.
+ *
+ * @head: Pointer to "struct tmy_io_buffer"
+ *
+ * Returns 0.
+ */
+static int read_manager_policy(struct tmy_io_buffer *head)
+{
+ struct list1_head *pos;
+ if (head->read_eof)
+ return 0;
+ list1_for_each_cookie(pos, head->read_var2, &policy_manager_list) {
+ struct policy_manager_entry *ptr;
+ ptr = list1_entry(pos, struct policy_manager_entry, list);
+ if (ptr->is_deleted)
+ continue;
+ if (!tmy_io_printf(head, "%s\n", ptr->manager->name))
+ return 0;
+ }
+ head->read_eof = true;
+ return 0;
+}
+
+/**
+ * is_policy_manager - Check whether the current process is a policy manager.
+ *
+ * Returns true if the current process is permitted to modify policy
+ * via /sys/kernel/security/tomoyo/ interface.
+ */
+static bool is_policy_manager(void)
+{
+ struct policy_manager_entry *ptr;
+ const char *exe;
+ const struct task_struct *task = current;
+ const struct path_info *domainname = tmy_domain(current)->domainname;
+ bool found = false;
+ if (!sbin_init_started)
+ return true;
+ if (!manage_by_non_root && (task->cred->uid || task->cred->euid))
+ return false;
+ list1_for_each_entry(ptr, &policy_manager_list, list) {
+ if (!ptr->is_deleted && ptr->is_domain
+ && !tmy_pathcmp(domainname, ptr->manager))
+ return true;
+ }
+ exe = tmy_get_exe();
+ if (!exe)
+ return false;
+ list1_for_each_entry(ptr, &policy_manager_list, list) {
+ if (!ptr->is_deleted && !ptr->is_domain
+ && !strcmp(exe, ptr->manager->name)) {
+ found = true;
+ break;
+ }
+ }
+ if (!found) { /* Reduce error messages. */
+ static pid_t last_pid;
+ const pid_t pid = current->pid;
+ if (last_pid != pid) {
+ printk(KERN_WARNING "%s ( %s ) is not permitted to "
+ "update policies.\n", domainname->name, exe);
+ last_pid = pid;
+ }
+ }
+ tmy_free(exe);
+ return found;
+}
+
+
+/**
+ * is_select_one - Parse select command.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ * @data: String to parse.
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool is_select_one(struct tmy_io_buffer *head, const char *data)
+{
+ unsigned int pid;
+ struct domain_info *domain = NULL;
+ if (sscanf(data, "pid=%u", &pid) == 1) {
+ struct task_struct *p;
+ /***** CRITICAL SECTION START *****/
+ read_lock(&tasklist_lock);
+ p = find_task_by_vpid(pid);
+ if (p) {
+ rcu_read_lock();
+ domain = tmy_domain(p);
+ rcu_read_unlock();
+ }
+ read_unlock(&tasklist_lock);
+ /***** CRITICAL SECTION END *****/
+ } else if (!strncmp(data, "domain=", 7)) {
+ if (tmy_is_domain_def(data + 7))
+ domain = tmy_find_domain(data + 7);
+ } else
+ return false;
+ head->read_avail = 0;
+ tmy_io_printf(head, "# select %s\n", data);
+ head->read_single_domain = true;
+ head->read_eof = !domain;
+ if (domain) {
+ struct domain_info *d;
+ head->read_var1 = NULL;
+ list1_for_each_entry(d, &domain_list, list) {
+ if (d == domain)
+ break;
+ head->read_var1 = &d->list;
+ }
+ head->read_var2 = NULL;
+ head->read_bit = 0;
+ head->read_step = 0;
+ if (domain->is_deleted)
+ tmy_io_printf(head, "# This is a deleted domain.\n");
+ }
+ head->write_var1 = domain;
+ return true;
+}
+
+/**
+ * write_domain_policy - Write domain policy.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int write_domain_policy(struct tmy_io_buffer *head)
+{
+ char *data = head->write_buf;
+ struct domain_info *domain = head->write_var1;
+ bool is_delete = false;
+ bool is_select = false;
+ bool is_undelete = false;
+ unsigned int profile;
+ if (str_starts(&data, KEYWORD_DELETE))
+ is_delete = true;
+ else if (str_starts(&data, KEYWORD_SELECT))
+ is_select = true;
+ else if (str_starts(&data, KEYWORD_UNDELETE))
+ is_undelete = true;
+ if (is_select && is_select_one(head, data))
+ return 0;
+ /* Don't allow updating policies by non manager programs. */
+ if (!is_policy_manager())
+ return -EPERM;
+ if (tmy_is_domain_def(data)) {
+ domain = NULL;
+ if (is_delete)
+ tmy_delete_domain(data);
+ else if (is_select)
+ domain = tmy_find_domain(data);
+ else if (is_undelete)
+ domain = tmy_undelete_domain(data);
+ else
+ domain = tmy_find_or_assign_new_domain(data, 0);
+ head->write_var1 = domain;
+ tmy_update_counter(TMY_UPDATES_COUNTER_DOMAIN_POLICY);
+ return 0;
+ }
+ if (!domain)
+ return -EINVAL;
+
+ if (sscanf(data, KEYWORD_USE_PROFILE "%u", &profile) == 1
+ && profile < MAX_PROFILES) {
+ if (profile_ptr[profile] || !sbin_init_started)
+ domain->profile = (u8) profile;
+ return 0;
+ }
+ if (!strcmp(data, KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
+ tmy_set_domain_flag(domain, is_delete,
+ DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ);
+ return 0;
+ }
+ return tmy_write_file_policy(data, domain, is_delete);
+}
+
+/**
+ * print_single_path_acl - Print a single path ACL entry.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ * @ptr: Pointer to "struct single_path_acl_record".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool print_single_path_acl(struct tmy_io_buffer *head,
+ struct single_path_acl_record *ptr)
+{
+ int pos;
+ u8 bit;
+ const char *atmark = "";
+ const char *filename;
+ const u16 perm = ptr->perm;
+ filename = ptr->filename->name;
+ for (bit = head->read_bit; bit < MAX_SINGLE_PATH_OPERATION; bit++) {
+ const char *msg;
+ if (!(perm & (1 << bit)))
+ continue;
+ /* Print "read/write" instead of "read" and "write". */
+ if ((bit == TMY_TYPE_READ_ACL || bit == TMY_TYPE_WRITE_ACL)
+ && (perm & (1 << TMY_TYPE_READ_WRITE_ACL)))
+ continue;
+ msg = tmy_sp2keyword(bit);
+ pos = head->read_avail;
+ if (!tmy_io_printf(head, "allow_%s %s%s\n", msg,
+ atmark, filename))
+ goto out;
+ }
+ head->read_bit = 0;
+ return true;
+out:
+ head->read_bit = bit;
+ head->read_avail = pos;
+ return false;
+}
+
+/**
+ * print_double_path_acl - Print a double path ACL entry.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ * @ptr: Pointer to "struct double_path_acl_record".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool print_double_path_acl(struct tmy_io_buffer *head,
+ struct double_path_acl_record *ptr)
+{
+ int pos;
+ const char *atmark1 = "";
+ const char *atmark2 = "";
+ const char *filename1;
+ const char *filename2;
+ const u8 perm = ptr->perm;
+ u8 bit;
+ filename1 = ptr->filename1->name;
+ filename2 = ptr->filename2->name;
+ for (bit = head->read_bit; bit < MAX_DOUBLE_PATH_OPERATION; bit++) {
+ const char *msg;
+ if (!(perm & (1 << bit)))
+ continue;
+ msg = tmy_dp2keyword(bit);
+ pos = head->read_avail;
+ if (!tmy_io_printf(head, "allow_%s %s%s %s%s\n", msg,
+ atmark1, filename1, atmark2, filename2))
+ goto out;
+ }
+ head->read_bit = 0;
+ return true;
+out:
+ head->read_bit = bit;
+ head->read_avail = pos;
+ return false;
+}
+
+/**
+ * print_entry - Print an ACL entry.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ * @ptr: Pointer to an ACL entry.
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool print_entry(struct tmy_io_buffer *head, struct acl_info *ptr)
+{
+ const u8 acl_type = tmy_acl_type2(ptr);
+ if (acl_type & ACL_DELETED)
+ return true;
+ if (acl_type == TYPE_SINGLE_PATH_ACL) {
+ struct single_path_acl_record *acl
+ = container_of(ptr, struct single_path_acl_record,
+ head);
+ return print_single_path_acl(head, acl);
+ }
+ if (acl_type == TYPE_DOUBLE_PATH_ACL) {
+ struct double_path_acl_record *acl
+ = container_of(ptr, struct double_path_acl_record,
+ head);
+ return print_double_path_acl(head, acl);
+ }
+ BUG(); /* This must not happen. */
+ return false;
+}
+
+/**
+ * read_domain_policy - Read domain policy.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ *
+ * Returns 0.
+ */
+static int read_domain_policy(struct tmy_io_buffer *head)
+{
+ struct list1_head *dpos;
+ struct list1_head *apos;
+ if (head->read_eof)
+ return 0;
+ if (head->read_step == 0)
+ head->read_step = 1;
+ list1_for_each_cookie(dpos, head->read_var1, &domain_list) {
+ struct domain_info *domain;
+ const char *quota_exceeded = "";
+ const char *transition_failed = "";
+ const char *ignore_global_allow_read = "";
+ domain = list1_entry(dpos, struct domain_info, list);
+ if (head->read_step != 1)
+ goto acl_loop;
+ if (domain->is_deleted && !head->read_single_domain)
+ continue;
+ /* Print domainname and flags. */
+ if (domain->quota_warned)
+ quota_exceeded = "quota_exceeded\n";
+ if (domain->flags & DOMAIN_FLAGS_TRANSITION_FAILED)
+ transition_failed = "transition_failed\n";
+ if (domain->flags & DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ)
+ ignore_global_allow_read
+ = KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
+ if (!tmy_io_printf(head, "%s\n" KEYWORD_USE_PROFILE "%u\n"
+ "%s%s%s\n", domain->domainname->name,
+ domain->profile, quota_exceeded,
+ transition_failed, ignore_global_allow_read))
+ return 0;
+ head->read_step = 2;
+acl_loop:
+ if (head->read_step == 3)
+ goto tail_mark;
+ /* Print ACL entries in the domain. */
+ list1_for_each_cookie(apos, head->read_var2,
+ &domain->acl_info_list) {
+ struct acl_info *ptr
+ = list1_entry(apos, struct acl_info, list);
+ if (!print_entry(head, ptr))
+ return 0;
+ }
+ head->read_step = 3;
+tail_mark:
+ if (!tmy_io_printf(head, "\n"))
+ return 0;
+ head->read_step = 1;
+ if (head->read_single_domain)
+ break;
+ }
+ head->read_eof = true;
+ return 0;
+}
+
+/**
+ * write_domain_profile - Assign profile for specified domain.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ *
+ * Returns 0 on success, -EINVAL otherwise.
+ *
+ * This is equivalent to doing
+ *
+ * ( echo "select " $domainname; echo "use_profile " $profile ) |
+ * /usr/lib/ccs/loadpolicy -d
+ */
+static int write_domain_profile(struct tmy_io_buffer *head)
+{
+ char *data = head->write_buf;
+ char *cp = strchr(data, ' ');
+ struct domain_info *domain;
+ unsigned long profile;
+ if (!cp)
+ return -EINVAL;
+ *cp = '\0';
+ domain = tmy_find_domain(cp + 1);
+ strict_strtoul(data, 10, &profile);
+ if (domain && profile < MAX_PROFILES
+ && (profile_ptr[profile] || !sbin_init_started))
+ domain->profile = (u8) profile;
+ tmy_update_counter(TMY_UPDATES_COUNTER_DOMAIN_POLICY);
+ return 0;
+}
+
+/**
+ * read_domain_profile - Read only domainname and profile.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ *
+ * Returns list of profile number and domainname pairs.
+ *
+ * This is equivalent to doing
+ *
+ * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
+ * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
+ * domainname = $0; } else if ( $1 == "use_profile" ) {
+ * print $2 " " domainname; domainname = ""; } } ; '
+ */
+static int read_domain_profile(struct tmy_io_buffer *head)
+{
+ struct list1_head *pos;
+ if (head->read_eof)
+ return 0;
+ list1_for_each_cookie(pos, head->read_var1, &domain_list) {
+ struct domain_info *domain;
+ domain = list1_entry(pos, struct domain_info, list);
+ if (domain->is_deleted)
+ continue;
+ if (!tmy_io_printf(head, "%u %s\n", domain->profile,
+ domain->domainname->name))
+ return 0;
+ }
+ head->read_eof = true;
+ return 0;
+}
+
+/**
+ * write_pid: Specify PID to obtain domainname.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ *
+ * Returns 0.
+ */
+static int write_pid(struct tmy_io_buffer *head)
+{
+ unsigned long pid;
+ strict_strtoul(head->write_buf, 10, &pid);
+ head->read_step = (int) pid;
+ head->read_eof = false;
+ return 0;
+}
+
+/**
+ * read_pid - Get domainname of the specified PID.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ *
+ * Returns the domainname which the specified PID is in on success,
+ * empty string otherwise.
+ * The PID is specified by write_pid() so that the user can obtain
+ * using read()/write() interface rather than sysctl() interface.
+ */
+static int read_pid(struct tmy_io_buffer *head)
+{
+ if (head->read_avail == 0 && !head->read_eof) {
+ const int pid = head->read_step;
+ struct task_struct *p;
+ struct domain_info *domain = NULL;
+ /***** CRITICAL SECTION START *****/
+ read_lock(&tasklist_lock);
+ p = find_task_by_vpid(pid);
+ if (p) {
+ rcu_read_lock();
+ domain = tmy_domain(p);
+ rcu_read_unlock();
+ }
+ read_unlock(&tasklist_lock);
+ /***** CRITICAL SECTION END *****/
+ if (domain)
+ tmy_io_printf(head, "%d %u %s", pid, domain->profile,
+ domain->domainname->name);
+ head->read_eof = true;
+ }
+ return 0;
+}
+
+/**
+ * write_exception_policy - Write exception policy.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int write_exception_policy(struct tmy_io_buffer *head)
+{
+ char *data = head->write_buf;
+ bool is_delete = str_starts(&data, KEYWORD_DELETE);
+ if (str_starts(&data, KEYWORD_KEEP_DOMAIN))
+ return tmy_write_domain_keeper_policy(data, false, is_delete);
+ if (str_starts(&data, KEYWORD_NO_KEEP_DOMAIN))
+ return tmy_write_domain_keeper_policy(data, true, is_delete);
+ if (str_starts(&data, KEYWORD_INITIALIZE_DOMAIN))
+ return tmy_write_domain_initializer_policy(data, false,
+ is_delete);
+ if (str_starts(&data, KEYWORD_NO_INITIALIZE_DOMAIN))
+ return tmy_write_domain_initializer_policy(data, true,
+ is_delete);
+ if (str_starts(&data, KEYWORD_ALIAS))
+ return tmy_write_alias_policy(data, is_delete);
+ if (str_starts(&data, KEYWORD_ALLOW_READ))
+ return tmy_write_globally_readable_policy(data, is_delete);
+ if (str_starts(&data, KEYWORD_FILE_PATTERN))
+ return tmy_write_pattern_policy(data, is_delete);
+ if (str_starts(&data, KEYWORD_DENY_REWRITE))
+ return tmy_write_no_rewrite_policy(data, is_delete);
+ return -EINVAL;
+}
+
+/**
+ * read_exception_policy - Read exception policy.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ *
+ * Returns 0 on success, -EINVAL otherwise.
+ */
+static int read_exception_policy(struct tmy_io_buffer *head)
+{
+ if (!head->read_eof) {
+ switch (head->read_step) {
+ case 0:
+ head->read_var2 = NULL;
+ head->read_step = 1;
+ case 1:
+ if (!tmy_read_domain_keeper_policy(head))
+ break;
+ head->read_var2 = NULL;
+ head->read_step = 2;
+ case 2:
+ if (!tmy_read_globally_readable_policy(head))
+ break;
+ head->read_var2 = NULL;
+ head->read_step = 3;
+ case 3:
+ head->read_var2 = NULL;
+ head->read_step = 4;
+ case 4:
+ if (!tmy_read_domain_initializer_policy(head))
+ break;
+ head->read_var2 = NULL;
+ head->read_step = 5;
+ case 5:
+ if (!tmy_read_alias_policy(head))
+ break;
+ head->read_var2 = NULL;
+ head->read_step = 6;
+ case 6:
+ head->read_var2 = NULL;
+ head->read_step = 7;
+ case 7:
+ if (!tmy_read_file_pattern(head))
+ break;
+ head->read_var2 = NULL;
+ head->read_step = 8;
+ case 8:
+ if (!tmy_read_no_rewrite_policy(head))
+ break;
+ head->read_var2 = NULL;
+ head->read_step = 9;
+ case 9:
+ head->read_eof = true;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+/* path to policy loader */
+static const char *tmy_loader = "/sbin/tomoyo-init";
+
+/**
+ * policy_loader_exists - Check whether /sbin/tomoyo-init exists.
+ *
+ * Returns true if /sbin/tomoyo-init exists, false otherwise.
+ */
+static bool policy_loader_exists(void)
+{
+ /*
+ * Don't activate MAC if the policy loader doesn't exist.
+ * If the initrd includes /sbin/init but real-root-dev has not
+ * mounted on / yet, activating MAC will block the system since
+ * policies are not loaded yet.
+ * Thus, let do_execve() call this function everytime.
+ */
+ struct nameidata nd;
+ if (path_lookup(tmy_loader, LOOKUP_FOLLOW, &nd)) {
+ printk(KERN_INFO "Not activating Mandatory Access Control now "
+ "since %s doesn't exist.\n", tmy_loader);
+ return false;
+ }
+ path_put(&nd.path);
+ return true;
+}
+
+/**
+ * tmy_load_policy - Run external policy loader to load policy.
+ *
+ * @filename: The program about to start.
+ *
+ * This function checks whether @filename is /sbin/init , and if so
+ * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
+ * and then continues invocation of /sbin/init.
+ * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
+ * writes to /sys/kernel/security/tomoyo/ interfaces.
+ *
+ * Returns nothing.
+ */
+void tmy_load_policy(const char *filename)
+{
+ char *argv[2];
+ char *envp[3];
+ if (sbin_init_started)
+ return;
+ /*
+ * Check filename is /sbin/init or /sbin/tomoyo-start.
+ * /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't
+ * be passed.
+ * You can create /sbin/tomoyo-start by
+ * "ln -s /bin/true /sbin/tomoyo-start".
+ */
+ if (strcmp(filename, "/sbin/init") &&
+ strcmp(filename, "/sbin/tomoyo-start"))
+ return;
+ if (!policy_loader_exists())
+ return;
+
+ printk(KERN_INFO "Calling %s to load policy. Please wait.\n",
+ tmy_loader);
+ argv[0] = (char *) tmy_loader;
+ argv[1] = NULL;
+ envp[0] = "HOME=/";
+ envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
+ envp[2] = NULL;
+ call_usermodehelper(argv[0], argv, envp, 1);
+
+ printk(KERN_INFO "TOMOYO: 2.2.0-pre 2008/09/24\n");
+ printk(KERN_INFO "Mandatory Access Control activated.\n");
+ sbin_init_started = true;
+ { /* Check all profiles currently assigned to domains are defined. */
+ struct domain_info *domain;
+ list1_for_each_entry(domain, &domain_list, list) {
+ const u8 profile = domain->profile;
+ if (profile_ptr[profile])
+ continue;
+ panic("Profile %u (used by '%s') not defined.\n",
+ profile, domain->domainname->name);
+ }
+ }
+}
+
+/* Policy updates counter. */
+static unsigned int updates_counter[MAX_TMY_UPDATES_COUNTER];
+
+/* Policy updates counter lock. */
+static DEFINE_SPINLOCK(updates_counter_lock);
+
+/**
+ * tmy_update_counter - Increment policy change counter.
+ *
+ * @index: Type of policy.
+ *
+ * Returns nothing.
+ */
+void tmy_update_counter(const unsigned char index)
+{
+ /***** CRITICAL SECTION START *****/
+ spin_lock(&updates_counter_lock);
+ if (index < MAX_TMY_UPDATES_COUNTER)
+ updates_counter[index]++;
+ spin_unlock(&updates_counter_lock);
+ /***** CRITICAL SECTION END *****/
+}
+
+/**
+ * read_updates_counter - Check for policy change counter.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ *
+ * Returns how many times policy has changed since the previous check.
+ */
+static int read_updates_counter(struct tmy_io_buffer *head)
+{
+ unsigned int counter[MAX_TMY_UPDATES_COUNTER];
+ if (head->read_eof)
+ return 0;
+ /***** CRITICAL SECTION START *****/
+ spin_lock(&updates_counter_lock);
+ memmove(counter, updates_counter, sizeof(updates_counter));
+ memset(updates_counter, 0, sizeof(updates_counter));
+ spin_unlock(&updates_counter_lock);
+ /***** CRITICAL SECTION END *****/
+ tmy_io_printf(head,
+ "/sys/kernel/security/tomoyo/domain_policy: %10u\n"
+ "/sys/kernel/security/tomoyo/exception_policy: %10u\n"
+ "/sys/kernel/security/tomoyo/profile: %10u\n"
+ "/sys/kernel/security/tomoyo/manager: %10u\n",
+ counter[TMY_UPDATES_COUNTER_DOMAIN_POLICY],
+ counter[TMY_UPDATES_COUNTER_EXCEPTION_POLICY],
+ counter[TMY_UPDATES_COUNTER_PROFILE],
+ counter[TMY_UPDATES_COUNTER_MANAGER]);
+ head->read_eof = true;
+ return 0;
+}
+
+/**
+ * read_version: Get version.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ *
+ * Returns version information.
+ */
+static int read_version(struct tmy_io_buffer *head)
+{
+ if (!head->read_eof) {
+ tmy_io_printf(head, "2.2.0-pre");
+ head->read_eof = true;
+ }
+ return 0;
+}
+
+/**
+ * read_self_domain - Get the current process's domainname.
+ *
+ * @head: Pointer to "struct tmy_io_buffer".
+ *
+ * Returns the current process's domainname.
+ */
+static int read_self_domain(struct tmy_io_buffer *head)
+{
+ if (!head->read_eof) {
+ /*
+ * tmy_domain(current)->domainname != NULL
+ * because every process belongs to a domain and
+ * the domain's name cannot be NULL.
+ */
+ tmy_io_printf(head, "%s",
+ tmy_domain(current)->domainname->name);
+ head->read_eof = true;
+ }
+ return 0;
+}
+
+/**
+ * tmy_open_control - open() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @type: Type of interface.
+ * @file: Pointer to "struct file".
+ *
+ * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
+ */
+static int tmy_open_control(const u8 type, struct file *file)
+{
+ struct tmy_io_buffer *head = tmy_alloc(sizeof(*head));
+ if (!head)
+ return -ENOMEM;
+ mutex_init(&head->io_sem);
+ switch (type) {
+ case TMY_DOMAINPOLICY:
+ /* /sys/kernel/security/tomoyo/domain_policy */
+ head->write = write_domain_policy;
+ head->read = read_domain_policy;
+ break;
+ case TMY_EXCEPTIONPOLICY:
+ /* /sys/kernel/security/tomoyo/exception_policy */
+ head->write = write_exception_policy;
+ head->read = read_exception_policy;
+ break;
+ case TMY_SELFDOMAIN:
+ /* /sys/kernel/security/tomoyo/self_domain */
+ head->read = read_self_domain;
+ break;
+ case TMY_DOMAIN_STATUS:
+ /* /sys/kernel/security/tomoyo/.domain_status */
+ head->write = write_domain_profile;
+ head->read = read_domain_profile;
+ break;
+ case TMY_PROCESS_STATUS:
+ /* /sys/kernel/security/tomoyo/.process_status */
+ head->write = write_pid;
+ head->read = read_pid;
+ break;
+ case TMY_VERSION:
+ /* /sys/kernel/security/tomoyo/version */
+ head->read = read_version;
+ head->readbuf_size = 128;
+ break;
+ case TMY_MEMINFO:
+ /* /sys/kernel/security/tomoyo/meminfo */
+ head->write = tmy_write_memory_quota;
+ head->read = tmy_read_memory_counter;
+ head->readbuf_size = 512;
+ break;
+ case TMY_PROFILE:
+ /* /sys/kernel/security/tomoyo/profile */
+ head->write = write_profile;
+ head->read = read_profile;
+ break;
+ case TMY_MANAGER:
+ /* /sys/kernel/security/tomoyo/manager */
+ head->write = write_manager_policy;
+ head->read = read_manager_policy;
+ break;
+ case TMY_UPDATESCOUNTER:
+ /* /sys/kernel/security/tomoyo/.updates_counter */
+ head->read = read_updates_counter;
+ break;
+ }
+ if (!(file->f_mode & FMODE_READ)) {
+ /*
+ * No need to allocate read_buf since it is not opened
+ * for reading.
+ */
+ head->read = NULL;
+ } else {
+ if (!head->readbuf_size)
+ head->readbuf_size = 4096 * 2;
+ head->read_buf = tmy_alloc(head->readbuf_size);
+ if (!head->read_buf) {
+ tmy_free(head);
+ return -ENOMEM;
+ }
+ }
+ if (!(file->f_mode & FMODE_WRITE)) {
+ /*
+ * No need to allocate write_buf since it is not opened
+ * for writing.
+ */
+ head->write = NULL;
+ } else if (head->write) {
+ head->writebuf_size = 4096 * 2;
+ head->write_buf = tmy_alloc(head->writebuf_size);
+ if (!head->write_buf) {
+ tmy_free(head->read_buf);
+ tmy_free(head);
+ return -ENOMEM;
+ }
+ }
+ file->private_data = head;
+ /*
+ * Call the handler now if the file is
+ * /sys/kernel/security/tomoyo/self_domain
+ * so that the user can use
+ * cat < /sys/kernel/security/tomoyo/self_domain"
+ * to know the current process's domainname.
+ */
+ if (type == TMY_SELFDOMAIN)
+ tmy_read_control(file, NULL, 0);
+ return 0;
+}
+
+/**
+ * tmy_read_control - read() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file: Pointer to "struct file".
+ * @buffer: Poiner to buffer to write to.
+ * @buffer_len: Size of @buffer.
+ *
+ * Returns bytes read on success, negative value otherwise.
+ */
+static int tmy_read_control(struct file *file, char __user *buffer,
+ const int buffer_len)
+{
+ int len = 0;
+ struct tmy_io_buffer *head = file->private_data;
+ char *cp;
+ if (!head->read)
+ return -ENOSYS;
+ if (!access_ok(VERIFY_WRITE, buffer, buffer_len))
+ return -EFAULT;
+ if (mutex_lock_interruptible(&head->io_sem))
+ return -EINTR;
+ /* Call the policy handler. */
+ len = head->read(head);
+ if (len < 0)
+ goto out;
+ /* Write to buffer. */
+ len = head->read_avail;
+ if (len > buffer_len)
+ len = buffer_len;
+ if (!len)
+ goto out;
+ /* head->read_buf changes by some functions. */
+ cp = head->read_buf;
+ if (copy_to_user(buffer, cp, len)) {
+ len = -EFAULT;
+ goto out;
+ }
+ head->read_avail -= len;
+ memmove(cp, cp + len, head->read_avail);
+out:
+ mutex_unlock(&head->io_sem);
+ return len;
+}
+
+/**
+ * tmy_write_control - write() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file: Pointer to "struct file".
+ * @buffer: Pointer to buffer to read from.
+ * @buffer_len: Size of @buffer.
+ *
+ * Returns @buffer_len on success, negative value otherwise.
+ */
+static int tmy_write_control(struct file *file, const char __user *buffer,
+ const int buffer_len)
+{
+ struct tmy_io_buffer *head = file->private_data;
+ int error = buffer_len;
+ int avail_len = buffer_len;
+ char *cp0 = head->write_buf;
+ if (!head->write)
+ return -ENOSYS;
+ if (!access_ok(VERIFY_READ, buffer, buffer_len))
+ return -EFAULT;
+ /* Don't allow updating policies by non manager programs. */
+ if (head->write != write_pid && head->write != write_domain_policy &&
+ !is_policy_manager())
+ return -EPERM;
+ if (mutex_lock_interruptible(&head->io_sem))
+ return -EINTR;
+ /* Read a line and dispatch it to the policy handler. */
+ while (avail_len > 0) {
+ char c;
+ if (head->write_avail >= head->writebuf_size - 1) {
+ error = -ENOMEM;
+ break;
+ } else if (get_user(c, buffer)) {
+ error = -EFAULT;
+ break;
+ }
+ buffer++;
+ avail_len--;
+ cp0[head->write_avail++] = c;
+ if (c != '\n')
+ continue;
+ cp0[head->write_avail - 1] = '\0';
+ head->write_avail = 0;
+ normalize_line(cp0);
+ head->write(head);
+ }
+ mutex_unlock(&head->io_sem);
+ return error;
+}
+
+/**
+ * tmy_close_control - close() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file: Pointer to "struct file".
+ *
+ * Releases memory and returns 0.
+ */
+static int tmy_close_control(struct file *file)
+{
+ struct tmy_io_buffer *head = file->private_data;
+ /* Release memory used for policy I/O. */
+ tmy_free(head->read_buf);
+ head->read_buf = NULL;
+ tmy_free(head->write_buf);
+ head->write_buf = NULL;
+ tmy_free(head);
+ head = NULL;
+ file->private_data = NULL;
+ return 0;
+}
+
+/**
+ * tmy_alloc_acl_element - Allocate permanent memory for ACL entry.
+ *
+ * @acl_type: Type of ACL entry.
+ *
+ * Returns pointer to the ACL entry on success, NULL otherwise.
+ */
+void *tmy_alloc_acl_element(const u8 acl_type)
+{
+ int len;
+ struct acl_info *ptr;
+ switch (acl_type) {
+ case TYPE_SINGLE_PATH_ACL:
+ len = sizeof(struct single_path_acl_record);
+ break;
+ case TYPE_DOUBLE_PATH_ACL:
+ len = sizeof(struct double_path_acl_record);
+ break;
+ default:
+ return NULL;
+ }
+ ptr = tmy_alloc_element(len);
+ if (!ptr)
+ return NULL;
+ ptr->type = acl_type;
+ return ptr;
+}
+
+/**
+ * tmy_open - open() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @inode: Pointer to "struct inode".
+ * @file: Pointer to "struct file".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tmy_open(struct inode *inode, struct file *file)
+{
+ return tmy_open_control(((u8 *) file->f_dentry->d_inode->i_private)
+ - ((u8 *) NULL), file);
+}
+
+/**
+ * tmy_release - close() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @inode: Pointer to "struct inode".
+ * @file: Pointer to "struct file".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tmy_release(struct inode *inode, struct file *file)
+{
+ return tmy_close_control(file);
+}
+
+/**
+ * tmy_read - read() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file: Pointer to "struct file".
+ * @buf: Pointer to buffer.
+ * @count: Size of @buf.
+ * @ppos: Unused.
+ *
+ * Returns bytes read on success, negative value otherwise.
+ */
+static ssize_t tmy_read(struct file *file, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ return tmy_read_control(file, buf, count);
+}
+
+/**
+ * tmy_write - write() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file: Pointer to "struct file".
+ * @buf: Pointer to buffer.
+ * @count: Size of @buf.
+ * @ppos: Unused.
+ *
+ * Returns @count on success, negative value otherwise.
+ */
+static ssize_t tmy_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ return tmy_write_control(file, buf, count);
+}
+
+/* Operations for /sys/kernel/security/tomoyo/interface. */
+static struct file_operations tmy_operations = {
+ .open = tmy_open,
+ .release = tmy_release,
+ .read = tmy_read,
+ .write = tmy_write,
+};
+
+/**
+ * create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
+ *
+ * @name: The name of the interface file.
+ * @mode: The permission of the interface file.
+ * @parent: The parent directory.
+ * @key: Type of interface.
+ *
+ * Returns nothing.
+ */
+static void __init create_entry(const char *name, const mode_t mode,
+ struct dentry *parent, const u8 key)
+{
+ securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
+ &tmy_operations);
+}
+
+/**
+ * tmy_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
+ *
+ * Returns 0.
+ */
+static int __init tmy_initerface_init(void)
+{
+ struct dentry *tmy_dir;
+ tmy_dir = securityfs_create_dir("tomoyo", NULL);
+ create_entry("domain_policy", 0600, tmy_dir, TMY_DOMAINPOLICY);
+ create_entry("exception_policy", 0600, tmy_dir, TMY_EXCEPTIONPOLICY);
+ create_entry("self_domain", 0400, tmy_dir, TMY_SELFDOMAIN);
+ create_entry(".domain_status", 0600, tmy_dir, TMY_DOMAIN_STATUS);
+ create_entry(".process_status", 0600, tmy_dir, TMY_PROCESS_STATUS);
+ create_entry("meminfo", 0600, tmy_dir, TMY_MEMINFO);
+ create_entry("profile", 0600, tmy_dir, TMY_PROFILE);
+ create_entry("manager", 0600, tmy_dir, TMY_MANAGER);
+ create_entry(".updates_counter", 0400, tmy_dir, TMY_UPDATESCOUNTER);
+ create_entry("version", 0400, tmy_dir, TMY_VERSION);
+ return 0;
+}
+
+fs_initcall(tmy_initerface_init);
--- /dev/null
+++ linux-2.6.27-rc7-mm1/security/tomoyo/common.h
@@ -0,0 +1,398 @@
+/*
+ * security/tomoyo/common.h
+ *
+ * Common functions for TOMOYO.
+ *
+ * Copyright (C) 2005-2008 NTT DATA CORPORATION
+ *
+ * Version: 2.2.0-pre 2008/09/24
+ *
+ */
+
+#ifndef _LINUX_TMY_COMMON_H
+#define _LINUX_TMY_COMMON_H
+
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/file.h>
+#include <linux/kmod.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/namei.h>
+#include <linux/mount.h>
+
+struct dentry;
+struct vfsmount;
+
+#define false 0
+#define true 1
+
+/*
+ * Singly linked list.
+ */
+struct list1_head {
+ struct list1_head *next;
+};
+
+#define LIST1_HEAD_INIT(name) { &(name) }
+#define LIST1_HEAD(name) struct list1_head name = LIST1_HEAD_INIT(name)
+
+static inline void INIT_LIST1_HEAD(struct list1_head *list)
+{
+ list->next = list;
+}
+
+/**
+ * list1_entry - get the struct for this entry
+ * @ptr: the &struct list1_head pointer.
+ * @type: the type of the struct this is embedded in.
+ * @member: the name of the list1_struct within the struct.
+ */
+#define list1_entry(ptr, type, member) container_of(ptr, type, member)
+
+/**
+ * list1_for_each - iterate over a list
+ * @pos: the &struct list1_head to use as a loop cursor.
+ * @head: the head for your list.
+ */
+#define list1_for_each(pos, head) \
+ for (pos = (head)->next; prefetch(pos->next), pos != (head); \
+ pos = pos->next)
+
+/**
+ * list1_for_each_entry - iterate over list of given type
+ * @pos: the type * to use as a loop cursor.
+ * @head: the head for your list.
+ * @member: the name of the list1_struct within the struct.
+ */
+#define list1_for_each_entry(pos, head, member) \
+ for (pos = list1_entry((head)->next, typeof(*pos), member); \
+ prefetch(pos->member.next), &pos->member != (head); \
+ pos = list1_entry(pos->member.next, typeof(*pos), member))
+
+/**
+ * list1_for_each_cookie - iterate over a list with cookie.
+ * @pos: the &struct list1_head to use as a loop cursor.
+ * @cookie: the &struct list1_head to use as a cookie.
+ * @head: the head for your list.
+ *
+ * Same with list_for_each except that this primitive uses cookie
+ * so that we can continue iteration.
+ */
+#define list1_for_each_cookie(pos, cookie, head) \
+ for (({ if (!cookie) \
+ cookie = head; }), pos = (cookie)->next; \
+ prefetch(pos->next), pos != (head) || ((cookie) = NULL); \
+ (cookie) = pos, pos = pos->next)
+
+/**
+ * list_add_tail_mb - add a new entry with memory barrier.
+ * @new: new entry to be added.
+ * @head: list head to add it before.
+ *
+ * Same with list_add_tail_rcu() except that this primitive uses mb()
+ * so that we can traverse forwards using list_for_each() and
+ * list_for_each_cookie().
+ */
+static inline void list1_add_tail_mb(struct list1_head *new,
+ struct list1_head *head)
+{
+ struct list1_head *pos = head;
+ new->next = head;
+ mb(); /* Avoid out-of-order execution. */
+ while (pos->next != head)
+ pos = pos->next;
+ pos->next = new;
+}
+
+/* Temporary buffer for holding pathnames. */
+struct tmy_page_buffer {
+ char buffer[4096];
+};
+
+/* Structure for attribute checks in addition to pathname checks. */
+struct obj_info {
+ struct tmy_page_buffer *tmp;
+};
+
+/* Structure for holding a token. */
+struct path_info {
+ const char *name;
+ u32 hash; /* = full_name_hash(name, strlen(name)) */
+ u16 total_len; /* = strlen(name) */
+ u16 const_len; /* = const_part_length(name) */
+ bool is_dir; /* = strendswith(name, "/") */
+ bool is_patterned; /* = path_contains_pattern(name) */
+ u16 depth; /* = path_depth(name) */
+};
+
+/*
+ * This is the max length of a token.
+ *
+ * A token consists of only ASCII printable characters.
+ * Non printable characters in a token is represented in \ooo style
+ * octal string. Thus, \ itself is represented as \\.
+ */
+#define TMY_MAX_PATHNAME_LEN 4000
+
+/* Structure for holding requested pathname. */
+struct path_info_with_data {
+ /* Keep "head" first, for this pointer is passed to tmy_free(). */
+ struct path_info head;
+ char bariier1[16]; /* Safeguard for overrun. */
+ char body[TMY_MAX_PATHNAME_LEN];
+ char barrier2[16]; /* Safeguard for overrun. */
+};
+
+/* Common header for holding ACL entries. */
+struct acl_info {
+ struct list1_head list;
+ /*
+ * Type of this ACL entry.
+ *
+ * MSB is is_deleted flag.
+ */
+ u8 type;
+} __attribute__((__packed__));
+
+/* This ACL entry is deleted. */
+#define ACL_DELETED 0x80
+
+/* Structure for domain information. */
+struct domain_info {
+ struct list1_head list;
+ struct list1_head acl_info_list;
+ /* Name of this domain. Never NULL. */
+ const struct path_info *domainname;
+ u8 profile; /* Profile number to use. */
+ u8 is_deleted; /* Delete flag. */
+ bool quota_warned; /* Quota warnning flag. */
+ /* DOMAIN_FLAGS_*. Use tmy_set_domain_flag() to modify. */
+ u8 flags;
+};
+
+/* Profile number is an integer between 0 and 255. */
+#define MAX_PROFILES 256
+
+/* Ignore "allow_read" directive in exception policy. */
+#define DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ 1
+/*
+ * This domain was unable to create a new domain at tmy_find_next_domain()
+ * because the name of the domain to be created was too long or
+ * it could not allocate memory.
+ * More than one process continued execve() without domain transition.
+ */
+#define DOMAIN_FLAGS_TRANSITION_FAILED 2
+
+/*
+ * Structure for "allow_read/write", "allow_execute", "allow_read",
+ * "allow_write", "allow_create", "allow_unlink", "allow_mkdir", "allow_rmdir",
+ * "allow_mkfifo", "allow_mksock", "allow_mkblock", "allow_mkchar",
+ * "allow_truncate", "allow_symlink" and "allow_rewrite" directive.
+ */
+struct single_path_acl_record {
+ struct acl_info head; /* type = TYPE_SINGLE_PATH_ACL */
+ u16 perm;
+ /* Pointer to single pathname. */
+ const struct path_info *filename;
+};
+
+/* Structure for "allow_rename" and "allow_link" directive. */
+struct double_path_acl_record {
+ struct acl_info head; /* type = TYPE_DOUBLE_PATH_ACL */
+ u8 perm;
+ /* Pointer to single pathname. */
+ const struct path_info *filename1;
+ /* Pointer to single pathname. */
+ const struct path_info *filename2;
+};
+
+/* Keywords for ACLs. */
+#define KEYWORD_ALIAS "alias "
+#define KEYWORD_ALLOW_READ "allow_read "
+#define KEYWORD_DELETE "delete "
+#define KEYWORD_DENY_REWRITE "deny_rewrite "
+#define KEYWORD_FILE_PATTERN "file_pattern "
+#define KEYWORD_INITIALIZE_DOMAIN "initialize_domain "
+#define KEYWORD_KEEP_DOMAIN "keep_domain "
+#define KEYWORD_NO_INITIALIZE_DOMAIN "no_initialize_domain "
+#define KEYWORD_NO_KEEP_DOMAIN "no_keep_domain "
+#define KEYWORD_SELECT "select "
+#define KEYWORD_UNDELETE "undelete "
+#define KEYWORD_USE_PROFILE "use_profile "
+#define KEYWORD_IGNORE_GLOBAL_ALLOW_READ "ignore_global_allow_read"
+/* A domain definition starts with <kernel>. */
+#define ROOT_NAME "<kernel>"
+#define ROOT_NAME_LEN (sizeof(ROOT_NAME) - 1)
+
+/* Index numbers for Access Controls. */
+#define TMY_TOMOYO_MAC_FOR_FILE 0 /* domain_policy.conf */
+#define TMY_TOMOYO_MAX_ACCEPT_ENTRY 1
+#define TMY_TOMOYO_VERBOSE 2
+#define TMY_MAX_CONTROL_INDEX 3
+
+/* Index numbers for updates counter. */
+#define TMY_UPDATES_COUNTER_DOMAIN_POLICY 0
+#define TMY_UPDATES_COUNTER_EXCEPTION_POLICY 1
+#define TMY_UPDATES_COUNTER_PROFILE 2
+#define TMY_UPDATES_COUNTER_MANAGER 3
+#define MAX_TMY_UPDATES_COUNTER 4
+
+/* Structure for reading/writing policy via securityfs interfaces. */
+struct tmy_io_buffer {
+ int (*read) (struct tmy_io_buffer *);
+ int (*write) (struct tmy_io_buffer *);
+ /* Exclusive lock for this structure. */
+ struct mutex io_sem;
+ /* The position currently reading from. */
+ struct list1_head *read_var1;
+ /* Extra variables for reading. */
+ struct list1_head *read_var2;
+ /* The position currently writing to. */
+ struct domain_info *write_var1;
+ /* The step for reading. */
+ int read_step;
+ /* Buffer for reading. */
+ char *read_buf;
+ /* EOF flag for reading. */
+ bool read_eof;
+ /* Read domain ACL of specified PID? */
+ bool read_single_domain;
+ /* Extra variable for reading. */
+ u8 read_bit;
+ /* Bytes available for reading. */
+ int read_avail;
+ /* Size of read buffer. */
+ int readbuf_size;
+ /* Buffer for writing. */
+ char *write_buf;
+ /* Bytes available for writing. */
+ int write_avail;
+ /* Size of write buffer. */
+ int writebuf_size;
+};
+
+/* Check whether the domain has too many ACL entries to hold. */
+bool tmy_check_domain_quota(struct domain_info * const domain);
+/* Transactional sprintf() for policy dump. */
+bool tmy_io_printf(struct tmy_io_buffer *head, const char *fmt, ...)
+ __attribute__ ((format(printf, 2, 3)));
+/* Check whether the domainname is correct. */
+bool tmy_is_correct_domain(const unsigned char *domainname,
+ const char *function);
+/* Check whether the token is correct. */
+bool tmy_is_correct_path(const char *filename, const s8 start_type,
+ const s8 pattern_type, const s8 end_type,
+ const char *function);
+/* Check whether the token can be a domainname. */
+bool tmy_is_domain_def(const unsigned char *buffer);
+/* Check whether the given filename matches the given pattern. */
+bool tmy_path_matches_pattern(const struct path_info *filename,
+ const struct path_info *pattern);
+/* Read "alias" entry in exception policy. */
+bool tmy_read_alias_policy(struct tmy_io_buffer *head);
+/*
+ * Read "initialize_domain" and "no_initialize_domain" entry
+ * in exception policy.
+ */
+bool tmy_read_domain_initializer_policy(struct tmy_io_buffer *head);
+/* Read "keep_domain" and "no_keep_domain" entry in exception policy. */
+bool tmy_read_domain_keeper_policy(struct tmy_io_buffer *head);
+/* Read "file_pattern" entry in exception policy. */
+bool tmy_read_file_pattern(struct tmy_io_buffer *head);
+/* Read "allow_read" entry in exception policy. */
+bool tmy_read_globally_readable_policy(struct tmy_io_buffer *head);
+/* Read "deny_rewrite" entry in exception policy. */
+bool tmy_read_no_rewrite_policy(struct tmy_io_buffer *head);
+/* Write domain policy violation warning message to console? */
+bool tmy_verbose_mode(void);
+/* Convert double path operation to operation name. */
+const char *tmy_dp2keyword(const u8 operation);
+/* Get the last component of the given domainname. */
+const char *tmy_get_last_name(const struct domain_info *domain);
+/* Get warning message. */
+const char *tmy_get_msg(const bool is_enforce);
+/* Convert single path operation to operation name. */
+const char *tmy_sp2keyword(const u8 operation);
+/* Add an ACL entry to domain's ACL list. */
+int tmy_add_domain_acl(struct domain_info *domain, struct acl_info *acl);
+/* Delete an ACL entry from domain's ACL list. */
+int tmy_del_domain_acl(struct acl_info *acl);
+/* Delete a domain. */
+int tmy_delete_domain(char *data);
+/* Create "alias" entry in exception policy. */
+int tmy_write_alias_policy(char *data, const bool is_delete);
+/*
+ * Create "initialize_domain" and "no_initialize_domain" entry
+ * in exception policy.
+ */
+int tmy_write_domain_initializer_policy(char *data, const bool is_not,
+ const bool is_delete);
+/* Create "keep_domain" and "no_keep_domain" entry in exception policy. */
+int tmy_write_domain_keeper_policy(char *data, const bool is_not,
+ const bool is_delete);
+/*
+ * Create "allow_read/write", "allow_execute", "allow_read", "allow_write",
+ * "allow_create", "allow_unlink", "allow_mkdir", "allow_rmdir",
+ * "allow_mkfifo", "allow_mksock", "allow_mkblock", "allow_mkchar",
+ * "allow_truncate", "allow_symlink", "allow_rewrite", "allow_rename" and
+ * "allow_link" entry in domain policy.
+ */
+int tmy_write_file_policy(char *data, struct domain_info *domain,
+ const bool is_delete);
+/* Create "allow_read" entry in exception policy. */
+int tmy_write_globally_readable_policy(char *data, const bool is_delete);
+/* Create "deny_rewrite" entry in exception policy. */
+int tmy_write_no_rewrite_policy(char *data, const bool is_delete);
+/* Create "file_pattern" entry in exception policy. */
+int tmy_write_pattern_policy(char *data, const bool is_delete);
+/* Find a domain by the given name. */
+struct domain_info *tmy_find_domain(const char *domainname);
+/* Find or create a domain by the given name. */
+struct domain_info *tmy_find_or_assign_new_domain(const char *domainname,
+ const u8 profile);
+/* Undelete a domain. */
+struct domain_info *tmy_undelete_domain(const char *domainname);
+/* Check mode for specified functionality. */
+unsigned int tmy_check_flags(const u8 index);
+/* Allocate memory for structures. */
+void *tmy_alloc_acl_element(const u8 acl_type);
+/* Fill in "struct path_info" members. */
+void tmy_fill_path_info(struct path_info *ptr);
+/* Run policy loader when /sbin/init starts. */
+void tmy_load_policy(const char *filename);
+/* Change "struct domain_info"->flags. */
+void tmy_set_domain_flag(struct domain_info *domain, const bool is_delete,
+ const u8 flags);
+/* Update the policy change counter. */
+void tmy_update_counter(const unsigned char index);
+
+/* strcmp() for "struct path_info" structure. */
+static inline bool tmy_pathcmp(const struct path_info *a,
+ const struct path_info *b)
+{
+ return a->hash != b->hash || strcmp(a->name, b->name);
+}
+
+/* Get type of an ACL entry. */
+static inline u8 tmy_acl_type1(struct acl_info *ptr)
+{
+ return ptr->type & ~ACL_DELETED;
+}
+
+/* Get type of an ACL entry. */
+static inline u8 tmy_acl_type2(struct acl_info *ptr)
+{
+ return ptr->type;
+}
+
+/* A linked list of domains. */
+extern struct list1_head domain_list;
+/* Has /sbin/init started? */
+extern bool sbin_init_started;
+/* The kernel's domain. */
+extern struct domain_info KERNEL_DOMAIN;
+/* Exclusive lock for updating domain policy. */
+extern struct mutex domain_acl_lock;
+
+#endif

--