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    Subject[TOMOYO #16 19/25] TOMOYO: Add policy I/O handler.
    This patch contains code for handling policy I/O.

    tomoyo_read_lock()/tomoyo_read_unlock() protects the data against the garbage
    collector. I call tomoyo_read_lock() when /sys/kernel/security/tomoyo/
    interface is open()ed and call tomoyo_read_unlock() when
    /sys/kernel/security/tomoyo/ interface is close()d rather than calling
    tomoyo_read_lock()/tomoyo_read_unlock() upon individual read()/write()
    requests. In this way, the pointers saved in "struct tomoyo_io_buffer" are
    guaranteed to be valid. Please ignore

    warning: context imbalance in 'tomoyo_open_control' - wrong count at exit
    warning: context imbalance in 'tomoyo_close_control' - unexpected unlock

    messages when built with "C=1" option.

    I don't call tomoyo_read_lock()/tomoyo_read_unlock() for
    /sys/kernel/security/tomoyo/query (for interactive enforcement) and
    /sys/kernel/security/tomoyo/grant_log (for access granted logs) and
    /sys/kernel/security/tomoyo/reject_log (for access rejected logs) because the
    data which these interfaces access is not subjected to the garbage collection.

    The "struct tomoyo_profile *"->name is not subjected to GC. It is manually
    garbage collected. Thus, to protect it against tomoyo_read_profile(),
    tomoyo_write_profile() uses tomoyo_profile_comment_lock spinlock.

    Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
    ---
    security/tomoyo/policy_io.c | 2734 ++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 2734 insertions(+)

    --- /dev/null
    +++ security-testing-2.6/security/tomoyo/policy_io.c
    @@ -0,0 +1,2734 @@
    +/*
    + * security/tomoyo/policy_io.c
    + *
    + * Copyright (C) 2005-2009 NTT DATA CORPORATION
    + */
    +
    +#include "internal.h"
    +
    +static struct tomoyo_profile tomoyo_default_profile = {
    + .learning = &tomoyo_default_profile.preference,
    + .permissive = &tomoyo_default_profile.preference,
    + .enforcing = &tomoyo_default_profile.preference,
    + .audit = &tomoyo_default_profile.preference,
    +#ifdef CONFIG_SECURITY_TOMOYO_AUDIT
    + .preference.audit_max_grant_log = CONFIG_SECURITY_TOMOYO_MAX_GRANT_LOG,
    + .preference.audit_max_reject_log
    + = CONFIG_SECURITY_TOMOYO_MAX_REJECT_LOG,
    +#endif
    + .preference.audit_task_info = true,
    + .preference.audit_path_info = true,
    + .preference.enforcing_penalty = 0,
    + .preference.enforcing_verbose = true,
    + .preference.learning_max_entry
    + = CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY,
    + .preference.learning_verbose = false,
    + .preference.learning_exec_realpath = true,
    + .preference.learning_exec_argv0 = true,
    + .preference.learning_symlink_target = true,
    + .preference.permissive_verbose = true
    +};
    +
    +/* Profile table. Memory is allocated as needed. */
    +static struct tomoyo_profile *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
    +
    +/* Lock for protecting "struct tomoyo_profile *"->comment */
    +static DEFINE_SPINLOCK(tomoyo_profile_comment_lock);
    +
    +/* String table for functionality that takes 4 modes. */
    +static const char *tomoyo_mode_4[4] = {
    + "disabled", "learning", "permissive", "enforcing"
    +};
    +
    +/* String table for /sys/kernel/security/tomoyo/profile */
    +static const char *tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX +
    + TOMOYO_MAX_CAPABILITY_INDEX +
    + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
    + [TOMOYO_MAC_FILE_EXECUTE]
    + = "file::execute",
    + [TOMOYO_MAC_FILE_OPEN]
    + = "file::open",
    + [TOMOYO_MAC_FILE_CREATE]
    + = "file::create",
    + [TOMOYO_MAC_FILE_UNLINK]
    + = "file::unlink",
    + [TOMOYO_MAC_FILE_MKDIR]
    + = "file::mkdir",
    + [TOMOYO_MAC_FILE_RMDIR]
    + = "file::rmdir",
    + [TOMOYO_MAC_FILE_MKFIFO]
    + = "file::mkfifo",
    + [TOMOYO_MAC_FILE_MKSOCK]
    + = "file::mksock",
    + [TOMOYO_MAC_FILE_TRUNCATE]
    + = "file::truncate",
    + [TOMOYO_MAC_FILE_SYMLINK]
    + = "file::symlink",
    + [TOMOYO_MAC_FILE_REWRITE]
    + = "file::rewrite",
    + [TOMOYO_MAC_FILE_MKBLOCK]
    + = "file::mkblock",
    + [TOMOYO_MAC_FILE_MKCHAR]
    + = "file::mkchar",
    + [TOMOYO_MAC_FILE_LINK]
    + = "file::link",
    + [TOMOYO_MAC_FILE_RENAME]
    + = "file::rename",
    + [TOMOYO_MAC_FILE_CHMOD]
    + = "file::chmod",
    + [TOMOYO_MAC_FILE_CHOWN]
    + = "file::chown",
    + [TOMOYO_MAC_FILE_CHGRP]
    + = "file::chgrp",
    + [TOMOYO_MAC_FILE_IOCTL]
    + = "file::ioctl",
    + [TOMOYO_MAC_FILE_CHROOT]
    + = "file::chroot",
    + [TOMOYO_MAC_FILE_MOUNT]
    + = "file::mount",
    + [TOMOYO_MAC_FILE_UMOUNT]
    + = "file::umount",
    + [TOMOYO_MAC_FILE_PIVOT_ROOT]
    + = "file::pivot_root",
    + [TOMOYO_MAC_ENVIRON]
    + = "misc::env",
    + [TOMOYO_MAC_NETWORK_UDP_BIND]
    + = "network::inet_udp_bind",
    + [TOMOYO_MAC_NETWORK_UDP_CONNECT]
    + = "network::inet_udp_connect",
    + [TOMOYO_MAC_NETWORK_TCP_BIND]
    + = "network::inet_tcp_bind",
    + [TOMOYO_MAC_NETWORK_TCP_LISTEN]
    + = "network::inet_tcp_listen",
    + [TOMOYO_MAC_NETWORK_TCP_CONNECT]
    + = "network::inet_tcp_connect",
    + [TOMOYO_MAC_NETWORK_TCP_ACCEPT]
    + = "network::inet_tcp_accept",
    + [TOMOYO_MAC_NETWORK_RAW_BIND]
    + = "network::inet_raw_bind",
    + [TOMOYO_MAC_NETWORK_RAW_CONNECT]
    + = "network::inet_raw_connect",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_INET_STREAM_SOCKET_CREATE]
    + = "capability::inet_tcp_create",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_INET_STREAM_SOCKET_LISTEN]
    + = "capability::inet_tcp_listen",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_INET_STREAM_SOCKET_CONNECT]
    + = "capability::inet_tcp_connect",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_USE_INET_DGRAM_SOCKET]
    + = "capability::use_inet_udp",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_USE_INET_RAW_SOCKET]
    + = "capability::use_inet_ip",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_USE_ROUTE_SOCKET]
    + = "capability::use_route",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_USE_PACKET_SOCKET]
    + = "capability::use_packet",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_MOUNT]
    + = "capability::SYS_MOUNT",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_UMOUNT]
    + = "capability::SYS_UMOUNT",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_CHROOT]
    + = "capability::SYS_CHROOT",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_CREATE_FIFO]
    + = "capability::create_fifo",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_CREATE_BLOCK_DEV]
    + = "capability::create_block_dev",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_CREATE_CHAR_DEV]
    + = "capability::create_char_dev",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_CREATE_UNIX_SOCKET]
    + = "capability::create_unix_socket",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_LINK]
    + = "capability::SYS_LINK",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_SYMLINK]
    + = "capability::SYS_SYMLINK",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_RENAME]
    + = "capability::SYS_RENAME",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_UNLINK]
    + = "capability::SYS_UNLINK",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_CHMOD]
    + = "capability::SYS_CHMOD",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_CHOWN]
    + = "capability::SYS_CHOWN",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_IOCTL]
    + = "capability::SYS_IOCTL",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_SYS_PIVOT_ROOT]
    + = "capability::SYS_PIVOT_ROOT",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_CAPABILITY_INDEX
    + + TOMOYO_MAC_CATEGORY_FILE] = "file",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_CAPABILITY_INDEX
    + + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_CAPABILITY_INDEX
    + + TOMOYO_MAC_CATEGORY_MISC] = "misc",
    + [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_CAPABILITY_INDEX
    + + TOMOYO_MAC_CATEGORY_CAPABILITY] = "capability",
    +};
    +
    +/* Permit policy management by non-root user? */
    +static bool tomoyo_manage_by_non_root;
    +
    +/**
    + * tomoyo_cap2keyword - Convert capability operation to capability name.
    + *
    + * @operation: The capability index.
    + *
    + * Returns the name of the specified capability's name.
    + */
    +const char *tomoyo_cap2keyword(const u8 operation)
    +{
    + return operation < TOMOYO_MAX_CAPABILITY_INDEX
    + ? tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX + operation] + 12 :
    + NULL;
    +}
    +
    +/**
    + * tomoyo_yesno - Return "yes" or "no".
    + *
    + * @value: Bool value.
    + */
    +static const char *tomoyo_yesno(const unsigned int value)
    +{
    + return value ? "yes" : "no";
    +}
    +
    +/**
    + * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @fmt: The printf()'s format string, followed by parameters.
    + *
    + * Returns true on success, false otherwise.
    + *
    + * The snprintf() will truncate, but tomoyo_io_printf() won't.
    + */
    +bool tomoyo_io_printf(struct tomoyo_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;
    +}
    +
    +/**
    + * tomoyo_find_or_assign_new_profile - Create a new profile.
    + *
    + * @profile: Profile number to create.
    + *
    + * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
    + */
    +static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned
    + int profile)
    +{
    + struct tomoyo_profile *ptr;
    + struct tomoyo_profile *entry;
    + if (profile >= TOMOYO_MAX_PROFILES)
    + return NULL;
    + ptr = tomoyo_profile_ptr[profile];
    + if (ptr)
    + return ptr;
    + entry = kzalloc(sizeof(*entry), GFP_KERNEL);
    + mutex_lock(&tomoyo_policy_lock);
    + ptr = tomoyo_profile_ptr[profile];
    + if (!ptr && tomoyo_memory_ok(entry, sizeof(*entry))) {
    + ptr = entry;
    + ptr->audit = &tomoyo_default_profile.preference;
    + ptr->learning = &tomoyo_default_profile.preference;
    + ptr->permissive = &tomoyo_default_profile.preference;
    + ptr->enforcing = &tomoyo_default_profile.preference;
    + ptr->default_config = TOMOYO_CONFIG_DISABLED |
    + TOMOYO_CONFIG_WANT_GRANT_LOG |
    + TOMOYO_CONFIG_WANT_REJECT_LOG;
    + memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
    + sizeof(ptr->config));
    + mb(); /* Avoid out-of-order execution. */
    + tomoyo_profile_ptr[profile] = ptr;
    + entry = NULL;
    + }
    + mutex_unlock(&tomoyo_policy_lock);
    + kfree(entry);
    + return ptr;
    +}
    +
    +/**
    + * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
    + */
    +void tomoyo_check_profile(void)
    +{
    + struct tomoyo_domain_info *domain;
    + tomoyo_policy_loaded = true;
    + list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
    + const u8 profile = domain->profile;
    + if (tomoyo_profile_ptr[profile])
    + continue;
    + panic("Profile %u (used by '%s') not defined.\n",
    + profile, domain->domainname->name);
    + }
    +}
    +
    +/**
    + * tomoyo_profile - Find a profile.
    + *
    + * @profile: Profile number to find.
    + *
    + * Returns pointer to "struct tomoyo_profile".
    + */
    +struct tomoyo_profile *tomoyo_profile(const u8 profile)
    +{
    + struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile];
    + if (!tomoyo_policy_loaded)
    + return &tomoyo_default_profile;
    + BUG_ON(!ptr);
    + return ptr;
    +}
    +
    +/**
    + * tomoyo_write_profile - Write profile table.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + *
    + * Returns 0 on success, negative value otherwise.
    + */
    +static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
    +{
    + char *data = head->write_buf;
    + unsigned int i;
    + int value;
    + int mode;
    + u8 config;
    + bool use_default = false;
    + char *cp;
    + struct tomoyo_profile *profile;
    + i = simple_strtoul(data, &cp, 10);
    + if (data == cp) {
    + profile = &tomoyo_default_profile;
    + } else {
    + if (*cp != '-')
    + return -EINVAL;
    + data = cp + 1;
    + profile = tomoyo_find_or_assign_new_profile(i);
    + if (!profile)
    + return -EINVAL;
    + }
    + cp = strchr(data, '=');
    + if (!cp)
    + return -EINVAL;
    + *cp++ = '\0';
    + if (profile != &tomoyo_default_profile)
    + use_default = strstr(cp, "use_default") != NULL;
    + if (strstr(cp, "verbose=yes"))
    + value = 1;
    + else if (strstr(cp, "verbose=no"))
    + value = 0;
    + else
    + value = -1;
    + if (!strcmp(data, "PREFERENCE::audit")) {
    +#ifdef CONFIG_SECURITY_TOMOYO_AUDIT
    + char *cp2;
    +#endif
    + if (use_default) {
    + profile->audit = &tomoyo_default_profile.preference;
    + return 0;
    + }
    + profile->audit = &profile->preference;
    +#ifdef CONFIG_SECURITY_TOMOYO_AUDIT
    + cp2 = strstr(cp, "max_grant_log=");
    + if (cp2)
    + sscanf(cp2 + 14, "%u",
    + &profile->preference.audit_max_grant_log);
    + cp2 = strstr(cp, "max_reject_log=");
    + if (cp2)
    + sscanf(cp2 + 15, "%u",
    + &profile->preference.audit_max_reject_log);
    +#endif
    + if (strstr(cp, "task_info=yes"))
    + profile->preference.audit_task_info = true;
    + else if (strstr(cp, "task_info=no"))
    + profile->preference.audit_task_info = false;
    + if (strstr(cp, "path_info=yes"))
    + profile->preference.audit_path_info = true;
    + else if (strstr(cp, "path_info=no"))
    + profile->preference.audit_path_info = false;
    + return 0;
    + }
    + if (!strcmp(data, "PREFERENCE::enforcing")) {
    + char *cp2;
    + if (use_default) {
    + profile->enforcing
    + = &tomoyo_default_profile.preference;
    + return 0;
    + }
    + profile->enforcing = &profile->preference;
    + if (value >= 0)
    + profile->preference.enforcing_verbose = value;
    + cp2 = strstr(cp, "penalty=");
    + if (cp2)
    + sscanf(cp2 + 8, "%u",
    + &profile->preference.enforcing_penalty);
    + return 0;
    + }
    + if (!strcmp(data, "PREFERENCE::permissive")) {
    + if (use_default) {
    + profile->permissive
    + = &tomoyo_default_profile.preference;
    + return 0;
    + }
    + profile->permissive = &profile->preference;
    + if (value >= 0)
    + profile->preference.permissive_verbose = value;
    + return 0;
    + }
    + if (!strcmp(data, "PREFERENCE::learning")) {
    + char *cp2;
    + if (use_default) {
    + profile->learning = &tomoyo_default_profile.preference;
    + return 0;
    + }
    + profile->learning = &profile->preference;
    + if (value >= 0)
    + profile->preference.learning_verbose = value;
    + cp2 = strstr(cp, "max_entry=");
    + if (cp2)
    + sscanf(cp2 + 10, "%u",
    + &profile->preference.learning_max_entry);
    + if (strstr(cp, "exec.realpath=yes"))
    + profile->preference.learning_exec_realpath = true;
    + else if (strstr(cp, "exec.realpath=no"))
    + profile->preference.learning_exec_realpath = false;
    + if (strstr(cp, "exec.argv0=yes"))
    + profile->preference.learning_exec_argv0 = true;
    + else if (strstr(cp, "exec.argv0=no"))
    + profile->preference.learning_exec_argv0 = false;
    + if (strstr(cp, "symlink.target=yes"))
    + profile->preference.learning_symlink_target = true;
    + else if (strstr(cp, "symlink.target=no"))
    + profile->preference.learning_symlink_target = false;
    + return 0;
    + }
    + if (profile == &tomoyo_default_profile)
    + return -EINVAL;
    + if (!strcmp(data, "COMMENT")) {
    + const struct tomoyo_path_info *new_comment
    + = tomoyo_get_name(cp);
    + const struct tomoyo_path_info *old_comment;
    + /* Protect reader from tomoyo_put_name(). */
    + spin_lock(&tomoyo_profile_comment_lock);
    + old_comment = profile->comment;
    + profile->comment = new_comment;
    + spin_unlock(&tomoyo_profile_comment_lock);
    + tomoyo_put_name(old_comment);
    + return 0;
    + }
    + if (!strcmp(data, "CONFIG")) {
    + i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_CAPABILITY_INDEX
    + + TOMOYO_MAX_MAC_CATEGORY_INDEX;
    + config = profile->default_config;
    + } else if (tomoyo_str_starts(&data, "CONFIG::")) {
    + config = 0;
    + for (i = 0; i < TOMOYO_MAX_MAC_INDEX
    + + TOMOYO_MAX_CAPABILITY_INDEX
    + + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
    + if (strcmp(data, tomoyo_mac_keywords[i]))
    + continue;
    + config = profile->config[i];
    + break;
    + }
    + if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_CAPABILITY_INDEX
    + + TOMOYO_MAX_MAC_CATEGORY_INDEX)
    + return -EINVAL;
    + } else {
    + return -EINVAL;
    + }
    + if (use_default) {
    + config = TOMOYO_CONFIG_USE_DEFAULT;
    + } else {
    + for (mode = 3; mode >= 0; mode--)
    + if (strstr(cp, tomoyo_mode_4[mode]))
    + /*
    + * Update lower 3 bits in order to distinguish
    + * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
    + */
    + config = (config & ~7) | mode;
    +#ifdef CONFIG_SECURITY_TOMOYO_AUDIT
    + if (config != TOMOYO_CONFIG_USE_DEFAULT) {
    + if (strstr(cp, "grant_log=yes"))
    + config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
    + else if (strstr(cp, "grant_log=no"))
    + config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
    + if (strstr(cp, "reject_log=yes"))
    + config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
    + else if (strstr(cp, "reject_log=no"))
    + config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
    + }
    +#endif
    + }
    + if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_CAPABILITY_INDEX
    + + TOMOYO_MAX_MAC_CATEGORY_INDEX)
    + profile->config[i] = config;
    + else if (config != TOMOYO_CONFIG_USE_DEFAULT)
    + profile->default_config = config;
    + return 0;
    +}
    +
    +/**
    + * tomoyo_read_profile - Read profile table.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + */
    +static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
    +{
    + int index;
    + if (head->read_eof)
    + return;
    + if (head->read_bit)
    + goto body;
    + tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903");
    + tomoyo_io_printf(head, "PREFERENCE::audit={ "
    +#ifdef CONFIG_SECURITY_TOMOYO_AUDIT
    + "max_grant_log=%u max_reject_log=%u "
    +#endif
    + "task_info=%s path_info=%s }\n",
    +#ifdef CONFIG_SECURITY_TOMOYO_AUDIT
    + tomoyo_default_profile.preference.audit_max_grant_log,
    + tomoyo_default_profile.preference.
    + audit_max_reject_log,
    +#endif
    + tomoyo_yesno(tomoyo_default_profile.preference.
    + audit_task_info),
    + tomoyo_yesno(tomoyo_default_profile.preference.
    + audit_path_info));
    + tomoyo_io_printf(head, "PREFERENCE::learning={ verbose=%s "
    + "max_entry=%u exec.realpath=%s exec.argv0=%s "
    + "symlink.target=%s }\n",
    + tomoyo_yesno(tomoyo_default_profile.preference.
    + learning_verbose),
    + tomoyo_default_profile.preference.learning_max_entry,
    + tomoyo_yesno(tomoyo_default_profile.preference.
    + learning_exec_realpath),
    + tomoyo_yesno(tomoyo_default_profile.preference.
    + learning_exec_argv0),
    + tomoyo_yesno(tomoyo_default_profile.preference.
    + learning_symlink_target));
    + tomoyo_io_printf(head, "PREFERENCE::permissive={ verbose=%s }\n",
    + tomoyo_yesno(tomoyo_default_profile.preference.
    + permissive_verbose));
    + tomoyo_io_printf(head, "PREFERENCE::enforcing={ verbose=%s penalty=%u "
    + "}\n",
    + tomoyo_yesno(tomoyo_default_profile.preference.
    + enforcing_verbose),
    + tomoyo_default_profile.preference.enforcing_penalty);
    + head->read_bit = 1;
    + body:
    + for (index = head->read_step; index < TOMOYO_MAX_PROFILES; index++) {
    + bool done;
    + u8 config;
    + int i;
    + int pos;
    + const struct tomoyo_profile *profile
    + = tomoyo_profile_ptr[index];
    + head->read_step = index;
    + if (!profile)
    + continue;
    + pos = head->read_avail;
    + spin_lock(&tomoyo_profile_comment_lock);
    + done = tomoyo_io_printf(head, "%u-COMMENT=%s\n", index,
    + profile->comment ?
    + profile->comment->name : "");
    + spin_unlock(&tomoyo_profile_comment_lock);
    + if (!done)
    + goto out;
    + config = profile->default_config;
    +#ifdef CONFIG_SECURITY_TOMOYO_AUDIT
    + if (!tomoyo_io_printf(head, "%u-CONFIG={ mode=%s grant_log=%s "
    + "reject_log=%s }\n", index,
    + tomoyo_mode_4[config & 3],
    + tomoyo_yesno(config &
    + TOMOYO_CONFIG_WANT_GRANT_LOG),
    + tomoyo_yesno(config &
    + TOMOYO_CONFIG_WANT_REJECT_LOG)))
    + goto out;
    +#else
    + if (!tomoyo_io_printf(head, "%u-CONFIG={ mode=%s }\n", index,
    + tomoyo_mode_4[config & 3]))
    + goto out;
    +#endif
    + for (i = 0; i < TOMOYO_MAX_MAC_INDEX
    + + TOMOYO_MAX_CAPABILITY_INDEX
    + + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
    +#ifdef CONFIG_SECURITY_TOMOYO_AUDIT
    + const char *g;
    + const char *r;
    +#endif
    + config = profile->config[i];
    + if (config == TOMOYO_CONFIG_USE_DEFAULT)
    + continue;
    +#ifdef CONFIG_SECURITY_TOMOYO_AUDIT
    + g = tomoyo_yesno(config &
    + TOMOYO_CONFIG_WANT_GRANT_LOG);
    + r = tomoyo_yesno(config &
    + TOMOYO_CONFIG_WANT_REJECT_LOG);
    + if (!tomoyo_io_printf(head, "%u-CONFIG::%s={ mode=%s "
    + "grant_log=%s reject_log=%s }\n",
    + index, tomoyo_mac_keywords[i],
    + tomoyo_mode_4[config & 3], g, r))
    + goto out;
    +#else
    + if (!tomoyo_io_printf(head,
    + "%u-CONFIG::%s={ mode=%s }\n",
    + index, tomoyo_mac_keywords[i],
    + tomoyo_mode_4[config & 3]))
    + goto out;
    +#endif
    + }
    + if (profile->audit != &tomoyo_default_profile.preference &&
    + !tomoyo_io_printf(head, "%u-PREFERENCE::audit={ "
    +#ifdef CONFIG_SECURITY_TOMOYO_AUDIT
    + "max_grant_log=%u max_reject_log=%u "
    +#endif
    + "task_info=%s path_info=%s }\n", index,
    +#ifdef CONFIG_SECURITY_TOMOYO_AUDIT
    + profile->preference.audit_max_grant_log,
    + profile->preference.audit_max_reject_log,
    +#endif
    + tomoyo_yesno(profile->preference.
    + audit_task_info),
    + tomoyo_yesno(profile->preference.
    + audit_path_info)))
    + goto out;
    + if (profile->learning != &tomoyo_default_profile.preference &&
    + !tomoyo_io_printf(head, "%u-PREFERENCE::learning={ "
    + "verbose=%s max_entry=%u "
    + "exec.realpath=%s exec.argv0=%s "
    + "symlink.target=%s }\n", index,
    + tomoyo_yesno(profile->preference.
    + learning_verbose),
    + profile->preference.learning_max_entry,
    + tomoyo_yesno(profile->preference.
    + learning_exec_realpath),
    + tomoyo_yesno(profile->preference.
    + learning_exec_argv0),
    + tomoyo_yesno(profile->preference.
    + learning_symlink_target)))
    + goto out;
    + if (profile->permissive != &tomoyo_default_profile.preference
    + && !tomoyo_io_printf(head, "%u-PREFERENCE::permissive={ "
    + "verbose=%s }\n", index,
    + tomoyo_yesno(profile->preference.
    + permissive_verbose)))
    + goto out;
    + if (profile->enforcing != &tomoyo_default_profile.preference &&
    + !tomoyo_io_printf(head, "%u-PREFERENCE::enforcing={ "
    + "verbose=%s penalty=%u }\n", index,
    + tomoyo_yesno(profile->preference.
    + enforcing_verbose),
    + profile->preference.enforcing_penalty))
    + goto out;
    + continue;
    + out:
    + head->read_avail = pos;
    + break;
    + }
    + if (index == TOMOYO_MAX_PROFILES)
    + head->read_eof = true;
    +}
    +
    +/*
    + * tomoyo_policy_manager_list is used for holding list of domainnames or
    + * programs which are permitted to modify configuration via
    + * /sys/kernel/security/tomoyo/ interface.
    + *
    + * An entry is added by
    + *
    + * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \
    + * /sys/kernel/security/tomoyo/manager
    + * (if you want to specify by a domainname)
    + *
    + * or
    + *
    + * # echo '/usr/lib/ccs/editpolicy' > /sys/kernel/security/tomoyo/manager
    + * (if you want to specify by a program's location)
    + *
    + * and is deleted by
    + *
    + * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \
    + * /sys/kernel/security/tomoyo/manager
    + *
    + * or
    + *
    + * # echo 'delete /usr/lib/ccs/editpolicy' > \
    + * /sys/kernel/security/tomoyo/manager
    + *
    + * and all entries are retrieved by
    + *
    + * # cat /sys/kernel/security/tomoyo/manager
    + */
    +LIST_HEAD(tomoyo_policy_manager_list);
    +
    +/**
    + * tomoyo_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 tomoyo_update_manager_entry(const char *manager,
    + const bool is_delete)
    +{
    + struct tomoyo_policy_manager_entry *entry = NULL;
    + struct tomoyo_policy_manager_entry *ptr;
    + struct tomoyo_policy_manager_entry e = { };
    + int error = is_delete ? -ENOENT : -ENOMEM;
    + if (tomoyo_is_domain_def(manager)) {
    + if (!tomoyo_is_correct_domain(manager))
    + return -EINVAL;
    + e.is_domain = true;
    + } else {
    + if (!tomoyo_is_correct_path(manager, 1, -1, -1))
    + return -EINVAL;
    + }
    + e.manager = tomoyo_get_name(manager);
    + if (!e.manager)
    + return -ENOMEM;
    + if (!is_delete)
    + entry = kmalloc(sizeof(e), GFP_KERNEL);
    + mutex_lock(&tomoyo_policy_lock);
    + list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
    + if (ptr->manager != e.manager)
    + continue;
    + ptr->is_deleted = is_delete;
    + error = 0;
    + break;
    + }
    + if (!is_delete && error && tomoyo_commit_ok(entry, &e, sizeof(e))) {
    + list_add_tail_rcu(&entry->list, &tomoyo_policy_manager_list);
    + entry = NULL;
    + error = 0;
    + }
    + mutex_unlock(&tomoyo_policy_lock);
    + tomoyo_put_name(e.manager);
    + kfree(entry);
    + return error;
    +}
    +
    +/**
    + * tomoyo_write_manager_policy - Write manager policy.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + *
    + * Returns 0 on success, negative value otherwise.
    + */
    +static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
    +{
    + char *data = head->write_buf;
    + bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
    + if (!strcmp(data, "manage_by_non_root")) {
    + tomoyo_manage_by_non_root = !is_delete;
    + return 0;
    + }
    + return tomoyo_update_manager_entry(data, is_delete);
    +}
    +
    +/**
    + * tomoyo_read_manager_policy - Read manager policy.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + *
    + * Caller holds tomoyo_read_lock().
    + */
    +static void tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
    +{
    + struct list_head *pos;
    + if (head->read_eof)
    + return;
    + list_for_each_cookie(pos, head->read_var2,
    + &tomoyo_policy_manager_list) {
    + struct tomoyo_policy_manager_entry *ptr;
    + ptr = list_entry(pos, struct tomoyo_policy_manager_entry,
    + list);
    + if (ptr->is_deleted)
    + continue;
    + if (!tomoyo_io_printf(head, "%s\n", ptr->manager->name))
    + return;
    + }
    + head->read_eof = true;
    +}
    +
    +/**
    + * tomoyo_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.
    + *
    + * Caller holds tomoyo_read_lock().
    + */
    +static bool tomoyo_is_policy_manager(void)
    +{
    + struct tomoyo_policy_manager_entry *ptr;
    + const char *exe;
    + struct task_struct *task = current;
    + const struct tomoyo_path_info *domainname
    + = tomoyo_current_domain()->domainname;
    + bool found = false;
    + if (!tomoyo_policy_loaded)
    + return true;
    + if (task->tomoyo_flags & TOMOYO_TASK_IS_POLICY_MANAGER)
    + return true;
    + if (!tomoyo_manage_by_non_root && (current_uid() || current_euid()))
    + return false;
    + list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
    + if (!ptr->is_deleted && ptr->is_domain
    + && !tomoyo_pathcmp(domainname, ptr->manager)) {
    + /* Set manager flag. */
    + task->tomoyo_flags |= TOMOYO_TASK_IS_POLICY_MANAGER;
    + return true;
    + }
    + }
    + exe = tomoyo_get_exe();
    + if (!exe)
    + return false;
    + list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
    + if (!ptr->is_deleted && !ptr->is_domain
    + && !strcmp(exe, ptr->manager->name)) {
    + found = true;
    + /* Set manager flag. */
    + task->tomoyo_flags |= TOMOYO_TASK_IS_POLICY_MANAGER;
    + break;
    + }
    + }
    + if (!found) { /* Reduce error messages. */
    + static pid_t tomoyo_last_pid;
    + const pid_t pid = current->pid;
    + if (tomoyo_last_pid != pid) {
    + printk(KERN_WARNING "%s ( %s ) is not permitted to "
    + "update policies.\n", domainname->name, exe);
    + tomoyo_last_pid = pid;
    + }
    + }
    + kfree(exe);
    + return found;
    +}
    +
    +/**
    + * tomoyo_find_condition_part - Find condition part from the statement.
    + *
    + * @data: String to parse.
    + *
    + * Returns pointer to the condition part if it was found in the statement,
    + * NULL otherwise.
    + */
    +static char *tomoyo_find_condition_part(char *data)
    +{
    + char *cp = strstr(data, " if ");
    + if (cp) {
    + while (1) {
    + char *cp2 = strstr(cp + 3, " if ");
    + if (!cp2)
    + break;
    + cp = cp2;
    + }
    + *cp++ = '\0';
    + } else {
    + cp = strstr(data, " ; set ");
    + if (cp)
    + *cp++ = '\0';
    + }
    + return cp;
    +}
    +
    +/**
    + * tomoyo_is_select_one - Parse select command.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @data: String to parse.
    + *
    + * Returns true on success, false otherwise.
    + *
    + * Caller holds tomoyo_read_lock().
    + */
    +static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head,
    + const char *data)
    +{
    + unsigned int pid;
    + struct tomoyo_domain_info *domain = NULL;
    + bool global_pid = false;
    + if (!strcmp(data, "allow_execute")) {
    + head->read_execute_only = true;
    + return true;
    + }
    + if (sscanf(data, "pid=%u", &pid) == 1 ||
    + (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
    + struct task_struct *p;
    + read_lock(&tasklist_lock);
    + if (global_pid)
    + p = find_task_by_pid_ns(pid, &init_pid_ns);
    + else
    + p = find_task_by_vpid(pid);
    + if (p)
    + domain = tomoyo_task_domain(p);
    + read_unlock(&tasklist_lock);
    + } else if (!strncmp(data, "domain=", 7)) {
    + if (tomoyo_is_domain_def(data + 7))
    + domain = tomoyo_find_domain(data + 7);
    + } else
    + return false;
    + head->write_var1 = domain;
    + /* Accessing read_buf is safe because head->io_sem is held. */
    + if (!head->read_buf)
    + return true; /* Do nothing if open(O_WRONLY). */
    + head->read_avail = 0;
    + tomoyo_io_printf(head, "# select %s\n", data);
    + head->read_single_domain = true;
    + head->read_eof = !domain;
    + if (domain) {
    + struct tomoyo_domain_info *d;
    + head->read_var1 = NULL;
    + list_for_each_entry_rcu(d, &tomoyo_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)
    + tomoyo_io_printf(head,
    + "# This is a deleted domain.\n");
    + }
    + return true;
    +}
    +
    +static int tomoyo_write_domain_policy2(char *data,
    + struct tomoyo_domain_info *domain,
    + struct tomoyo_condition *cond,
    + const bool is_delete)
    +{
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_CAPABILITY))
    + return tomoyo_write_capability_policy(data, domain, cond,
    + is_delete);
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_NETWORK))
    + return tomoyo_write_network_policy(data, domain, cond,
    + is_delete);
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_ENV))
    + return tomoyo_write_env_policy(data, domain, cond, is_delete);
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT))
    + return tomoyo_write_mount_policy(data, domain, cond,
    + is_delete);
    + return tomoyo_write_file_policy(data, domain, cond, is_delete);
    +}
    +
    +/**
    + * tomoyo_write_domain_policy - Write domain policy.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + *
    + * Returns 0 on success, negative value otherwise.
    + */
    +static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
    +{
    + char *data = head->write_buf;
    + struct tomoyo_domain_info *domain = head->write_var1;
    + bool is_delete = false;
    + bool is_select = false;
    + unsigned int profile;
    + struct tomoyo_condition *cond = NULL;
    + char *cp;
    + int error;
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
    + is_delete = true;
    + else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
    + is_select = true;
    + if (is_select && tomoyo_is_select_one(head, data))
    + return 0;
    + /* Don't allow updating policies by non manager programs. */
    + if (!tomoyo_is_policy_manager())
    + return -EPERM;
    + if (tomoyo_is_domain_def(data)) {
    + domain = NULL;
    + if (is_delete)
    + tomoyo_delete_domain(data);
    + else if (is_select)
    + domain = tomoyo_find_domain(data);
    + else
    + domain = tomoyo_find_or_assign_new_domain(data, 0);
    + head->write_var1 = domain;
    + return 0;
    + }
    + if (!domain)
    + return -EINVAL;
    +
    + if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
    + && profile < TOMOYO_MAX_PROFILES) {
    + if (!tomoyo_policy_loaded || tomoyo_profile_ptr[(u8) profile])
    + domain->profile = (u8) profile;
    + return 0;
    + }
    + if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
    + domain->ignore_global_allow_read = !is_delete;
    + return 0;
    + }
    + if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_ENV)) {
    + domain->ignore_global_allow_env = !is_delete;
    + return 0;
    + }
    + cp = tomoyo_find_condition_part(data);
    + if (cp) {
    + cond = tomoyo_get_condition(cp);
    + if (!cond)
    + return -EINVAL;
    + }
    + error = tomoyo_write_domain_policy2(data, domain, cond, is_delete);
    + if (cond)
    + tomoyo_put_condition(cond);
    + return error;
    +}
    +
    +/**
    + * tomoyo_print_name_union - Print a tomoyo_name_union.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to "struct tomoyo_name_union".
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_name_union(struct tomoyo_io_buffer *head,
    + const struct tomoyo_name_union *ptr)
    +{
    + int pos = head->read_avail;
    + if (pos && head->read_buf[pos - 1] == ' ')
    + head->read_avail--;
    + if (ptr->is_group)
    + return tomoyo_io_printf(head, " @%s",
    + ptr->group->group_name->name);
    + return tomoyo_io_printf(head, " %s", ptr->filename->name);
    +}
    +
    +/**
    + * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with double quotes.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to "struct tomoyo_name_union".
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
    + const struct tomoyo_name_union *ptr)
    +{
    + if (ptr->is_group)
    + return tomoyo_io_printf(head, "@%s",
    + ptr->group->group_name->name);
    + return tomoyo_io_printf(head, "\"%s\"", ptr->filename->name);
    +}
    +
    +/**
    + * tomoyo_print_number_union_common - Print a tomoyo_number_union.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to "struct tomoyo_number_union".
    + * @need_space: True if a space character is needed.
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_number_union_common
    +(struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr,
    + const bool need_space)
    +{
    + unsigned long min;
    + unsigned long max;
    + u8 min_type;
    + u8 max_type;
    + if (need_space && !tomoyo_io_printf(head, " "))
    + return false;
    + if (ptr->is_group)
    + return tomoyo_io_printf(head, "@%s",
    + ptr->group->group_name->name);
    + min_type = ptr->min_type;
    + max_type = ptr->max_type;
    + min = ptr->values[0];
    + max = ptr->values[1];
    + switch (min_type) {
    + case TOMOYO_VALUE_TYPE_HEXADECIMAL:
    + if (!tomoyo_io_printf(head, "0x%lX", min))
    + return false;
    + break;
    + case TOMOYO_VALUE_TYPE_OCTAL:
    + if (!tomoyo_io_printf(head, "0%lo", min))
    + return false;
    + break;
    + default:
    + if (!tomoyo_io_printf(head, "%lu", min))
    + return false;
    + break;
    + }
    + if (min == max && min_type == max_type)
    + return true;
    + switch (max_type) {
    + case TOMOYO_VALUE_TYPE_HEXADECIMAL:
    + return tomoyo_io_printf(head, "-0x%lX", max);
    + case TOMOYO_VALUE_TYPE_OCTAL:
    + return tomoyo_io_printf(head, "-0%lo", max);
    + default:
    + return tomoyo_io_printf(head, "-%lu", max);
    + }
    +}
    +
    +/**
    + * tomoyo_print_number_union - Print a tomoyo_number_union.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to "struct tomoyo_number_union".
    + *
    + * Returns true on success, false otherwise.
    + */
    +bool tomoyo_print_number_union(struct tomoyo_io_buffer *head,
    + const struct tomoyo_number_union *ptr)
    +{
    + return tomoyo_print_number_union_common(head, ptr, true);
    +}
    +
    +/**
    + * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space character.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to "struct tomoyo_number_union".
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_number_union_nospace
    +(struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
    +{
    + return tomoyo_print_number_union_common(head, ptr, false);
    +}
    +
    +/**
    + * tomoyo_print_condition - Print condition part.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @cond: Pointer to "struct tomoyo_condition". May be NULL.
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
    + const struct tomoyo_condition *cond)
    +{
    + const struct tomoyo_condition_element *condp;
    + const struct tomoyo_number_union *numbers_p;
    + const struct tomoyo_name_union *names_p;
    + const struct tomoyo_argv_entry *argv;
    + const struct tomoyo_envp_entry *envp;
    + u16 condc;
    + u16 i;
    + u16 j;
    + char buffer[32];
    + if (!cond)
    + goto no_condition;
    + condc = cond->condc;
    + condp = (const struct tomoyo_condition_element *) (cond + 1);
    + numbers_p = (const struct tomoyo_number_union *) (condp + condc);
    + names_p = (const struct tomoyo_name_union *)
    + (numbers_p + cond->numbers_count);
    + argv = (const struct tomoyo_argv_entry *) (names_p + cond->names_count);
    + envp = (const struct tomoyo_envp_entry *) (argv + cond->argc);
    + memset(buffer, 0, sizeof(buffer));
    + if (condc && !tomoyo_io_printf(head, "%s", " if"))
    + goto out;
    + for (i = 0; i < condc; i++) {
    + const u8 match = condp->equals;
    + const u8 left = condp->left;
    + const u8 right = condp->right;
    + condp++;
    + switch (left) {
    + case TOMOYO_ARGV_ENTRY:
    + if (!tomoyo_io_printf(head, " exec.argv[%u]%s\"%s\"",
    + argv->index, argv->is_not ?
    + "!=" : "=", argv->value->name))
    + goto out;
    + argv++;
    + continue;
    + case TOMOYO_ENVP_ENTRY:
    + if (!tomoyo_io_printf(head, " exec.envp[\"%s\"]%s",
    + envp->name->name, envp->is_not ?
    + "!=" : "="))
    + goto out;
    + if (envp->value) {
    + if (!tomoyo_io_printf(head, "\"%s\"",
    + envp->value->name))
    + goto out;
    + } else {
    + if (!tomoyo_io_printf(head, "NULL"))
    + goto out;
    + }
    + envp++;
    + continue;
    + case TOMOYO_NUMBER_UNION:
    + if (!tomoyo_print_number_union(head, numbers_p++))
    + goto out;
    + break;
    + default:
    + if (left >= TOMOYO_MAX_CONDITION_KEYWORD)
    + goto out;
    + if (!tomoyo_io_printf(head, " %s",
    + tomoyo_condition_keyword[left]))
    + goto out;
    + break;
    + }
    + if (!tomoyo_io_printf(head, "%s", match ? "=" : "!="))
    + goto out;
    + switch (right) {
    + case TOMOYO_NAME_UNION:
    + if (!tomoyo_print_name_union_quoted(head, names_p++))
    + goto out;
    + break;
    + case TOMOYO_NUMBER_UNION:
    + if (!tomoyo_print_number_union_nospace(head,
    + numbers_p++))
    + goto out;
    + break;
    + default:
    + if (right >= TOMOYO_MAX_CONDITION_KEYWORD)
    + goto out;
    + if (!tomoyo_io_printf(head, "%s",
    + tomoyo_condition_keyword[right]))
    + goto out;
    + break;
    + }
    + }
    + i = cond->post_state[3];
    + if (!i)
    + goto no_condition;
    + if (!tomoyo_io_printf(head, " ; set"))
    + goto out;
    + for (j = 0; j < 3; j++) {
    + if (!(i & (1 << j)))
    + continue;
    + if (!tomoyo_io_printf(head, " task.state[%u]=%u", j,
    + cond->post_state[j]))
    + goto out;
    + }
    + no_condition:
    + if (tomoyo_io_printf(head, "\n"))
    + return true;
    + out:
    + return false;
    +}
    +
    +/**
    + * tomoyo_print_path_acl - Print a single path ACL entry.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to "struct tomoyo_path_acl".
    + * @cond: Pointer to "struct tomoyo_condition". May be NULL.
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head,
    + struct tomoyo_path_acl *ptr,
    + const struct tomoyo_condition *cond)
    +{
    + int pos;
    + u8 bit;
    + const u16 perm = ptr->perm;
    + for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
    + if (!(perm & (1 << bit)))
    + continue;
    + if (head->read_execute_only && bit != TOMOYO_TYPE_EXECUTE)
    + continue;
    + /* Print "read/write" instead of "read" and "write". */
    + if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE)
    + && (perm & (1 << TOMOYO_TYPE_READ_WRITE)))
    + continue;
    + pos = head->read_avail;
    + if (!tomoyo_io_printf(head, "allow_%s",
    + tomoyo_path2keyword(bit)) ||
    + !tomoyo_print_name_union(head, &ptr->name) ||
    + !tomoyo_print_condition(head, cond)) {
    + head->read_bit = bit;
    + head->read_avail = pos;
    + return false;
    + }
    + }
    + head->read_bit = 0;
    + return true;
    +}
    +
    +/**
    + * tomoyo_print_path_number3_acl - Print a path_number3 ACL entry.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to "struct tomoyo_path_number3_acl".
    + * @cond: Pointer to "struct tomoyo_condition". May be NULL.
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_path_number3_acl(struct tomoyo_io_buffer *head,
    + struct tomoyo_path_number3_acl *ptr,
    + const struct tomoyo_condition *cond)
    +{
    + int pos;
    + u8 bit;
    + const u16 perm = ptr->perm;
    + for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER3_OPERATION;
    + bit++) {
    + if (!(perm & (1 << bit)))
    + continue;
    + pos = head->read_avail;
    + if (!tomoyo_io_printf(head, "allow_%s",
    + tomoyo_path_number32keyword(bit)) ||
    + !tomoyo_print_name_union(head, &ptr->name) ||
    + !tomoyo_print_number_union(head, &ptr->mode) ||
    + !tomoyo_print_number_union(head, &ptr->major) ||
    + !tomoyo_print_number_union(head, &ptr->minor) ||
    + !tomoyo_print_condition(head, cond)) {
    + head->read_bit = bit;
    + head->read_avail = pos;
    + return false;
    + }
    + }
    + head->read_bit = 0;
    + return true;
    +}
    +
    +/**
    + * tomoyo_print_path2_acl - Print a path2 ACL entry.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to "struct tomoyo_path2_acl".
    + * @cond: Pointer to "struct tomoyo_condition". May be NULL.
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head,
    + struct tomoyo_path2_acl *ptr,
    + const struct tomoyo_condition *cond)
    +{
    + int pos;
    + u8 bit;
    + const u8 perm = ptr->perm;
    + for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
    + if (!(perm & (1 << bit)))
    + continue;
    + pos = head->read_avail;
    + if (!tomoyo_io_printf(head, "allow_%s",
    + tomoyo_path22keyword(bit)) ||
    + !tomoyo_print_name_union(head, &ptr->name1) ||
    + !tomoyo_print_name_union(head, &ptr->name2) ||
    + !tomoyo_print_condition(head, cond)) {
    + head->read_bit = bit;
    + head->read_avail = pos;
    + return false;
    + }
    + }
    + head->read_bit = 0;
    + return true;
    +}
    +
    +/**
    + * tomoyo_print_path_number_acl - Print a path_number ACL entry.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to "struct tomoyo_path_number_acl".
    + * @cond: Pointer to "struct tomoyo_condition". May be NULL.
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head,
    + struct tomoyo_path_number_acl *ptr,
    + const struct tomoyo_condition *cond)
    +{
    + int pos;
    + u8 bit;
    + const u8 perm = ptr->perm;
    + for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION;
    + bit++) {
    + if (!(perm & (1 << bit)))
    + continue;
    + pos = head->read_avail;
    + if (!tomoyo_io_printf(head, "allow_%s",
    + tomoyo_path_number2keyword(bit)) ||
    + !tomoyo_print_name_union(head, &ptr->name) ||
    + !tomoyo_print_number_union(head, &ptr->number) ||
    + !tomoyo_print_condition(head, cond)) {
    + head->read_bit = bit;
    + head->read_avail = pos;
    + return false;
    + }
    + }
    + head->read_bit = 0;
    + return true;
    +}
    +
    +/**
    + * tomoyo_print_env_acl - Print an evironment variable name's ACL entry.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to "struct tomoyo_env_acl".
    + * @cond: Pointer to "struct tomoyo_condition". May be NULL.
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_env_acl(struct tomoyo_io_buffer *head,
    + struct tomoyo_env_acl *ptr,
    + const struct tomoyo_condition *cond)
    +{
    + const int pos = head->read_avail;
    + if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_ENV "%s",
    + ptr->env->name) ||
    + !tomoyo_print_condition(head, cond)) {
    + head->read_avail = pos;
    + return false;
    + }
    + return true;
    +}
    +
    +/**
    + * tomoyo_print_capability_acl - Print a capability ACL entry.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to "struct tomoyo_capability_acl".
    + * @cond: Pointer to "struct tomoyo_condition". May be NULL.
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_capability_acl(struct tomoyo_io_buffer *head,
    + struct tomoyo_capability_acl *ptr,
    + const struct tomoyo_condition *cond)
    +{
    + const int pos = head->read_avail;
    + if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_CAPABILITY "%s",
    + tomoyo_cap2keyword(ptr->operation)) ||
    + !tomoyo_print_condition(head, cond)) {
    + head->read_avail = pos;
    + return false;
    + }
    + return true;
    +}
    +
    +/**
    + * tomoyo_print_ipv4_entry - Print IPv4 address of a network ACL entry.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to "struct tomoyo_ip_network_acl".
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_ipv4_entry(struct tomoyo_io_buffer *head,
    + struct tomoyo_ip_network_acl *ptr)
    +{
    + const u32 min_address = ptr->address.ipv4.min;
    + const u32 max_address = ptr->address.ipv4.max;
    + if (!tomoyo_io_printf(head, "%u.%u.%u.%u", HIPQUAD(min_address)))
    + return false;
    + if (min_address != max_address
    + && !tomoyo_io_printf(head, "-%u.%u.%u.%u", HIPQUAD(max_address)))
    + return false;
    + return true;
    +}
    +
    +/**
    + * tomoyo_print_ipv6_entry - Print IPv6 address of a network ACL entry.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to "struct tomoyo_ip_network_acl".
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_ipv6_entry(struct tomoyo_io_buffer *head,
    + struct tomoyo_ip_network_acl *ptr)
    +{
    + char buf[64];
    + const struct in6_addr *min_address = ptr->address.ipv6.min;
    + const struct in6_addr *max_address = ptr->address.ipv6.max;
    + tomoyo_print_ipv6(buf, sizeof(buf), min_address);
    + if (!tomoyo_io_printf(head, "%s", buf))
    + return false;
    + if (min_address != max_address) {
    + tomoyo_print_ipv6(buf, sizeof(buf), max_address);
    + if (!tomoyo_io_printf(head, "-%s", buf))
    + return false;
    + }
    + return true;
    +}
    +
    +/**
    + * tomoyo_print_network_acl - Print a network ACL entry.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to "struct tomoyo_ip_network_acl".
    + * @cond: Pointer to "struct tomoyo_condition". May be NULL.
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_network_acl(struct tomoyo_io_buffer *head,
    + struct tomoyo_ip_network_acl *ptr,
    + const struct tomoyo_condition *cond)
    +{
    + int pos;
    + u8 bit;
    + const u16 perm = ptr->perm;
    + for (bit = head->read_bit; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
    + if (!(perm & (1 << bit)))
    + continue;
    + pos = head->read_avail;
    + if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_NETWORK "%s ",
    + tomoyo_net2keyword(bit)))
    + goto out;
    + switch (ptr->address_type) {
    + case TOMOYO_IP_ADDRESS_TYPE_ADDRESS_GROUP:
    + if (!tomoyo_io_printf(head, "@%s", ptr->address.group->
    + group_name->name))
    + goto out;
    + break;
    + case TOMOYO_IP_ADDRESS_TYPE_IPv4:
    + if (!tomoyo_print_ipv4_entry(head, ptr))
    + goto out;
    + break;
    + case TOMOYO_IP_ADDRESS_TYPE_IPv6:
    + if (!tomoyo_print_ipv6_entry(head, ptr))
    + goto out;
    + break;
    + }
    + if (!tomoyo_print_number_union(head, &ptr->port) ||
    + !tomoyo_print_condition(head, cond))
    + goto out;
    + }
    + head->read_bit = 0;
    + return true;
    + out:
    + head->read_bit = bit;
    + head->read_avail = pos;
    + return false;
    +}
    +
    +/**
    + * tomoyo_print_execute_handler_record - Print an execute handler ACL entry.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @keyword: Name of the keyword.
    + * @ptr: Pointer to "struct tomoyo_execute_handler_record".
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_execute_handler_record
    +(struct tomoyo_io_buffer *head, const char *keyword,
    + struct tomoyo_execute_handler_record *ptr)
    +{
    + return tomoyo_io_printf(head, "%s %s\n", keyword, ptr->handler->name);
    +}
    +
    +/**
    + * tomoyo_print_mount_acl - Print a mount ACL entry.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to "struct tomoyo_mount_acl".
    + * @cond: Pointer to "struct tomoyo_condition". May be NULL.
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head,
    + struct tomoyo_mount_acl *ptr,
    + const struct tomoyo_condition *cond)
    +{
    + const int pos = head->read_avail;
    + if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) ||
    + !tomoyo_print_name_union(head, &ptr->dev_name) ||
    + !tomoyo_print_name_union(head, &ptr->dir_name) ||
    + !tomoyo_print_name_union(head, &ptr->fs_type) ||
    + !tomoyo_print_number_union(head, &ptr->flags) ||
    + !tomoyo_print_condition(head, cond)) {
    + head->read_avail = pos;
    + return false;
    + }
    + return true;
    +}
    +
    +/**
    + * tomoyo_print_entry - Print an ACL entry.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + * @ptr: Pointer to an ACL entry.
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
    + struct tomoyo_acl_info *ptr)
    +{
    + const struct tomoyo_condition *cond = ptr->cond;
    + const u8 acl_type = ptr->type;
    + if (ptr->is_deleted)
    + return true;
    + if (acl_type == TOMOYO_TYPE_PATH_ACL) {
    + struct tomoyo_path_acl *acl
    + = container_of(ptr, struct tomoyo_path_acl, head);
    + return tomoyo_print_path_acl(head, acl, cond);
    + }
    + if (acl_type == TOMOYO_TYPE_EXECUTE_HANDLER) {
    + struct tomoyo_execute_handler_record *acl
    + = container_of(ptr,
    + struct tomoyo_execute_handler_record,
    + head);
    + const char *keyword = TOMOYO_KEYWORD_EXECUTE_HANDLER;
    + return tomoyo_print_execute_handler_record(head, keyword, acl);
    + }
    + if (acl_type == TOMOYO_TYPE_DENIED_EXECUTE_HANDLER) {
    + struct tomoyo_execute_handler_record *acl
    + = container_of(ptr,
    + struct tomoyo_execute_handler_record,
    + head);
    + const char *keyword = TOMOYO_KEYWORD_DENIED_EXECUTE_HANDLER;
    + return tomoyo_print_execute_handler_record(head, keyword, acl);
    + }
    + if (head->read_execute_only)
    + return true;
    + if (acl_type == TOMOYO_TYPE_PATH_NUMBER3_ACL) {
    + struct tomoyo_path_number3_acl *acl
    + = container_of(ptr, struct tomoyo_path_number3_acl,
    + head);
    + return tomoyo_print_path_number3_acl(head, acl, cond);
    + }
    + if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
    + struct tomoyo_path2_acl *acl
    + = container_of(ptr, struct tomoyo_path2_acl,
    + head);
    + return tomoyo_print_path2_acl(head, acl, cond);
    + }
    + if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
    + struct tomoyo_path_number_acl *acl
    + = container_of(ptr, struct tomoyo_path_number_acl,
    + head);
    + return tomoyo_print_path_number_acl(head, acl, cond);
    + }
    + if (acl_type == TOMOYO_TYPE_ENV_ACL) {
    + struct tomoyo_env_acl *acl
    + = container_of(ptr, struct tomoyo_env_acl, head);
    + return tomoyo_print_env_acl(head, acl, cond);
    + }
    + if (acl_type == TOMOYO_TYPE_CAPABILITY_ACL) {
    + struct tomoyo_capability_acl *acl
    + = container_of(ptr, struct tomoyo_capability_acl,
    + head);
    + return tomoyo_print_capability_acl(head, acl, cond);
    + }
    + if (acl_type == TOMOYO_TYPE_IP_NETWORK_ACL) {
    + struct tomoyo_ip_network_acl *acl
    + = container_of(ptr, struct tomoyo_ip_network_acl,
    + head);
    + return tomoyo_print_network_acl(head, acl, cond);
    + }
    + if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
    + struct tomoyo_mount_acl *acl
    + = container_of(ptr, struct tomoyo_mount_acl, head);
    + return tomoyo_print_mount_acl(head, acl, cond);
    + }
    + BUG(); /* This must not happen. */
    + return false;
    +}
    +
    +/**
    + * tomoyo_read_domain_policy - Read domain policy.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + *
    + * Caller holds tomoyo_read_lock().
    + */
    +static void tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
    +{
    + struct list_head *dpos;
    + struct list_head *apos;
    + if (head->read_eof)
    + return;
    + if (head->read_step == 0)
    + head->read_step = 1;
    + list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
    + struct tomoyo_domain_info *domain;
    + const char *quota_exceeded = "";
    + const char *transition_failed = "";
    + const char *ignore_global_allow_read = "";
    + const char *ignore_global_allow_env = "";
    + domain = list_entry(dpos, struct tomoyo_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->domain_transition_failed)
    + transition_failed = "transition_failed\n";
    + if (domain->ignore_global_allow_read)
    + ignore_global_allow_read
    + = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
    + if (domain->ignore_global_allow_env)
    + ignore_global_allow_env
    + = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_ENV "\n";
    + if (!tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE
    + "%u\n%s%s%s%s\n",
    + domain->domainname->name,
    + domain->profile, quota_exceeded,
    + transition_failed,
    + ignore_global_allow_read,
    + ignore_global_allow_env))
    + return;
    + head->read_step = 2;
    + acl_loop:
    + if (head->read_step == 3)
    + goto tail_mark;
    + /* Print ACL entries in the domain. */
    + list_for_each_cookie(apos, head->read_var2,
    + &domain->acl_info_list) {
    + struct tomoyo_acl_info *ptr
    + = list_entry(apos, struct tomoyo_acl_info,
    + list);
    + if (!tomoyo_print_entry(head, ptr))
    + return;
    + }
    + head->read_step = 3;
    + tail_mark:
    + if (!tomoyo_io_printf(head, "\n"))
    + return;
    + head->read_step = 1;
    + if (head->read_single_domain)
    + break;
    + }
    + head->read_eof = true;
    +}
    +
    +/**
    + * tomoyo_write_domain_profile - Assign profile for specified domain.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + *
    + * Returns 0 on success, -EINVAL otherwise.
    + *
    + * This is equivalent to doing
    + *
    + * ( echo "select " $domainname; echo "use_profile " $profile ) |
    + * /usr/sbin/tomoyo-loadpolicy -d
    + *
    + * Caller holds tomoyo_read_lock().
    + */
    +static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
    +{
    + char *data = head->write_buf;
    + char *cp = strchr(data, ' ');
    + struct tomoyo_domain_info *domain;
    + unsigned int profile;
    + if (!cp)
    + return -EINVAL;
    + *cp = '\0';
    + profile = simple_strtoul(data, NULL, 10);
    + if (profile >= TOMOYO_MAX_PROFILES)
    + return -EINVAL;
    + domain = tomoyo_find_domain(cp + 1);
    + if (domain && (!tomoyo_policy_loaded ||
    + tomoyo_profile_ptr[(u8) profile]))
    + domain->profile = (u8) profile;
    + return 0;
    +}
    +
    +/**
    + * tomoyo_read_domain_profile - Read only domainname and profile.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + *
    + * This is equivalent to doing
    + *
    + * grep -A 1 '^<kernel>' /sys/kernel/security/domain_policy |
    + * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
    + * domainname = $0; } else if ( $1 == "use_profile" ) {
    + * print $2 " " domainname; domainname = ""; } } ; '
    + *
    + * Caller holds tomoyo_read_lock().
    + */
    +static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
    +{
    + struct list_head *pos;
    + if (head->read_eof)
    + return;
    + list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
    + struct tomoyo_domain_info *domain;
    + domain = list_entry(pos, struct tomoyo_domain_info, list);
    + if (domain->is_deleted)
    + continue;
    + if (!tomoyo_io_printf(head, "%u %s\n", domain->profile,
    + domain->domainname->name))
    + return;
    + }
    + head->read_eof = true;
    +}
    +
    +/**
    + * tomoyo_write_pid: Specify PID to obtain domainname.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + *
    + * Returns 0.
    + */
    +static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
    +{
    + head->read_eof = false;
    + return 0;
    +}
    +
    +/**
    + * tomoyo_read_pid - Read information of a process.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + *
    + * Returns the domainname which the specified PID is in or
    + * process information of the specified PID on success,
    + * empty string otherwise.
    + *
    + * Caller holds tomoyo_read_lock().
    + */
    +static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
    +{
    + char *buf = head->write_buf;
    + bool task_info = false;
    + bool global_pid = false;
    + unsigned int pid;
    + struct task_struct *p;
    + struct tomoyo_domain_info *domain = NULL;
    + u32 tomoyo_flags = 0;
    + /* Accessing write_buf is safe because head->io_sem is held. */
    + if (!buf)
    + return; /* Do nothing if open(O_RDONLY). */
    + if (head->read_avail || head->read_eof)
    + return;
    + head->read_eof = true;
    + if (tomoyo_str_starts(&buf, "info "))
    + task_info = true;
    + if (tomoyo_str_starts(&buf, "global-pid "))
    + global_pid = true;
    + pid = (unsigned int) simple_strtoul(buf, NULL, 10);
    + read_lock(&tasklist_lock);
    + if (global_pid)
    + p = find_task_by_pid_ns(pid, &init_pid_ns);
    + else
    + p = find_task_by_vpid(pid);
    + if (p) {
    + domain = tomoyo_task_domain(p);
    + tomoyo_flags = p->tomoyo_flags;
    + }
    + read_unlock(&tasklist_lock);
    + if (!domain)
    + return;
    + if (!task_info)
    + tomoyo_io_printf(head, "%u %u %s", pid, domain->profile,
    + domain->domainname->name);
    + else
    + tomoyo_io_printf(head, "%u manager=%s execute_handler=%s "
    + "state[0]=%u state[1]=%u state[2]=%u", pid,
    + tomoyo_yesno(tomoyo_flags &
    + TOMOYO_TASK_IS_POLICY_MANAGER),
    + tomoyo_yesno(tomoyo_flags &
    + TOMOYO_TASK_IS_EXECUTE_HANDLER),
    + (u8) (tomoyo_flags >> 24),
    + (u8) (tomoyo_flags >> 16),
    + (u8) (tomoyo_flags >> 8));
    +}
    +
    +/**
    + * tomoyo_write_exception_policy - Write exception policy.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + *
    + * Returns 0 on success, negative value otherwise.
    + */
    +static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
    +{
    + char *data = head->write_buf;
    + bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN))
    + return tomoyo_write_domain_keeper_policy(data, false,
    + is_delete);
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN))
    + return tomoyo_write_domain_keeper_policy(data, true,
    + is_delete);
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN))
    + return tomoyo_write_domain_initializer_policy(data, false,
    + is_delete);
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN))
    + return tomoyo_write_domain_initializer_policy(data, true,
    + is_delete);
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR))
    + return tomoyo_write_aggregator_policy(data, is_delete);
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
    + return tomoyo_write_globally_readable_policy(data, is_delete);
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_ENV))
    + return tomoyo_write_globally_usable_env_policy(data,
    + is_delete);
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
    + return tomoyo_write_pattern_policy(data, is_delete);
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP))
    + return tomoyo_write_path_group_policy(data, is_delete);
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP))
    + return tomoyo_write_number_group_policy(data, is_delete);
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
    + return tomoyo_write_no_rewrite_policy(data, is_delete);
    + if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ADDRESS_GROUP))
    + return tomoyo_write_address_group_policy(data, is_delete);
    + return -EINVAL;
    +}
    +
    +/**
    + * tomoyo_read_exception_policy - Read exception policy.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + *
    + * Caller holds tomoyo_read_lock().
    + */
    +static void tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
    +{
    + if (head->read_eof)
    + return;
    + switch (head->read_step) {
    + case 0:
    + head->read_var2 = NULL;
    + head->read_step = 1;
    + case 1:
    + if (!tomoyo_read_domain_keeper_policy(head))
    + break;
    + head->read_var2 = NULL;
    + head->read_step = 2;
    + case 2:
    + if (!tomoyo_read_globally_readable_policy(head))
    + break;
    + head->read_var2 = NULL;
    + head->read_step = 3;
    + case 3:
    + if (!tomoyo_read_globally_usable_env_policy(head))
    + break;
    + head->read_var2 = NULL;
    + head->read_step = 4;
    + case 4:
    + if (!tomoyo_read_domain_initializer_policy(head))
    + break;
    + head->read_var2 = NULL;
    + head->read_step = 6;
    + case 6:
    + if (!tomoyo_read_aggregator_policy(head))
    + break;
    + head->read_var2 = NULL;
    + head->read_step = 7;
    + case 7:
    + if (!tomoyo_read_file_pattern(head))
    + break;
    + head->read_var2 = NULL;
    + head->read_step = 8;
    + case 8:
    + if (!tomoyo_read_no_rewrite_policy(head))
    + break;
    + head->read_var2 = NULL;
    + head->read_step = 9;
    + case 9:
    + if (!tomoyo_read_path_group_policy(head))
    + break;
    + head->read_var1 = NULL;
    + head->read_var2 = NULL;
    + head->read_step = 10;
    + case 10:
    + if (!tomoyo_read_number_group_policy(head))
    + break;
    + head->read_var1 = NULL;
    + head->read_var2 = NULL;
    + head->read_step = 11;
    + case 11:
    + if (!tomoyo_read_address_group_policy(head))
    + break;
    + head->read_var2 = NULL;
    + head->read_eof = true;
    + }
    +}
    +
    +/**
    + * tomoyo_get_argv0 - Get argv[0].
    + *
    + * @ee: Pointer to "struct tomoyo_execve_entry".
    + *
    + * Returns true on success, false otherwise.
    + */
    +static bool tomoyo_get_argv0(struct tomoyo_execve_entry *ee)
    +{
    + struct linux_binprm *bprm = ee->bprm;
    + char *arg_ptr = ee->tmp;
    + int arg_len = 0;
    + unsigned long pos = bprm->p;
    + int offset = pos % PAGE_SIZE;
    + bool done = false;
    + if (!bprm->argc)
    + goto out;
    + while (1) {
    + if (!tomoyo_dump_page(bprm, pos, &ee->dump))
    + goto out;
    + pos += PAGE_SIZE - offset;
    + /* Read. */
    + while (offset < PAGE_SIZE) {
    + const char *kaddr = ee->dump.data;
    + const unsigned char c = kaddr[offset++];
    + if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) {
    + if (c == '\\') {
    + arg_ptr[arg_len++] = '\\';
    + arg_ptr[arg_len++] = '\\';
    + } else if (c > ' ' && c < 127) {
    + arg_ptr[arg_len++] = c;
    + } else {
    + arg_ptr[arg_len++] = '\\';
    + arg_ptr[arg_len++] = (c >> 6) + '0';
    + arg_ptr[arg_len++]
    + = ((c >> 3) & 7) + '0';
    + arg_ptr[arg_len++] = (c & 7) + '0';
    + }
    + } else {
    + arg_ptr[arg_len] = '\0';
    + done = true;
    + break;
    + }
    + }
    + offset = 0;
    + if (done)
    + break;
    + }
    + return true;
    + out:
    + return false;
    +}
    +
    +/**
    + * tomoyo_get_execute_condition - Get condition part for execute requests.
    + *
    + * @ee: Pointer to "struct tomoyo_execve_entry".
    + *
    + * Returns pointer to "struct tomoyo_condition" on success, NULL otherwise.
    + */
    +static struct tomoyo_condition *tomoyo_get_execute_condition
    +(struct tomoyo_execve_entry *ee)
    +{
    + struct tomoyo_condition *cond;
    + char *buf;
    + int len = 256;
    + char *realpath = NULL;
    + char *argv0 = NULL;
    + const struct tomoyo_profile *profile
    + = tomoyo_profile(ee->r.domain->profile);
    + if (profile->learning->learning_exec_realpath) {
    + struct file *file = ee->bprm->file;
    + realpath = tomoyo_realpath_from_path(&file->f_path);
    + if (realpath)
    + len += strlen(realpath) + 17;
    + }
    + if (profile->learning->learning_exec_argv0) {
    + if (tomoyo_get_argv0(ee)) {
    + argv0 = ee->tmp;
    + len += strlen(argv0) + 16;
    + }
    + }
    + buf = kmalloc(len, GFP_KERNEL);
    + if (!buf) {
    + kfree(realpath);
    + return NULL;
    + }
    + snprintf(buf, len - 1, "if");
    + if (current->tomoyo_flags & TOMOYO_TASK_IS_EXECUTE_HANDLER) {
    + const int pos = strlen(buf);
    + snprintf(buf + pos, len - pos - 1,
    + " task.type=execute_handler");
    + }
    + if (realpath) {
    + const int pos = strlen(buf);
    + snprintf(buf + pos, len - pos - 1, " exec.realpath=\"%s\"",
    + realpath);
    + kfree(realpath);
    + }
    + if (argv0) {
    + const int pos = strlen(buf);
    + snprintf(buf + pos, len - pos - 1, " exec.argv[0]=\"%s\"",
    + argv0);
    + }
    + cond = tomoyo_get_condition(buf);
    + kfree(buf);
    + return cond;
    +}
    +
    +/**
    + * tomoyo_get_symlink_condition - Get condition part for symlink requests.
    + *
    + * @r: Pointer to "struct tomoyo_request_info".
    + *
    + * Returns pointer to "struct tomoyo_condition" on success, NULL otherwise.
    + */
    +static struct tomoyo_condition *tomoyo_get_symlink_condition
    +(struct tomoyo_request_info *r)
    +{
    + struct tomoyo_condition *cond;
    + char *buf;
    + int len = 256;
    + const char *symlink = NULL;
    + const struct tomoyo_profile *profile = tomoyo_profile(r->profile);
    + if (profile->learning->learning_symlink_target) {
    + symlink = r->obj->symlink_target->name;
    + len += strlen(symlink) + 18;
    + }
    + buf = kmalloc(len, GFP_KERNEL);
    + if (!buf)
    + return NULL;
    + snprintf(buf, len - 1, "if");
    + if (current->tomoyo_flags & TOMOYO_TASK_IS_EXECUTE_HANDLER) {
    + const int pos = strlen(buf);
    + snprintf(buf + pos, len - pos - 1,
    + " task.type=execute_handler");
    + }
    + if (symlink) {
    + const int pos = strlen(buf);
    + snprintf(buf + pos, len - pos - 1, " symlink.target=\"%s\"",
    + symlink);
    + }
    + cond = tomoyo_get_condition(buf);
    + kfree(buf);
    + return cond;
    +}
    +
    +/* Wait queue for tomoyo_query_list. */
    +static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
    +
    +/* Lock for manipulating tomoyo_query_list. */
    +static DEFINE_SPINLOCK(tomoyo_query_list_lock);
    +
    +/* Structure for query. */
    +struct tomoyo_query_entry {
    + struct list_head list;
    + char *query;
    + int query_len;
    + unsigned int serial;
    + int timer;
    + int answer;
    +};
    +
    +/* The list for "struct tomoyo_query_entry". */
    +static LIST_HEAD(tomoyo_query_list);
    +
    +/* Number of "struct file" referring /sys/kernel/security/query interface. */
    +static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
    +
    +/**
    + * tomoyo_supervisor - Ask for the supervisor's decision.
    + *
    + * @r: Pointer to "struct tomoyo_request_info".
    + * @fmt: The printf()'s format string, followed by parameters.
    + *
    + * Returns 0 if the supervisor decided to permit the access request which
    + * violated the policy in enforcing mode, 1 if the supervisor decided to
    + * retry the access request which violated the policy in enforcing mode,
    + * 0 if it is not in enforcing mode, -EPERM otherwise.
    + */
    +int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
    +{
    + va_list args;
    + int error = -EPERM;
    + int pos;
    + int len;
    + static unsigned int tomoyo_serial;
    + struct tomoyo_query_entry *tomoyo_query_entry = NULL;
    + bool quota_exceeded = false;
    + char *header;
    + if (!r->domain)
    + r->domain = tomoyo_current_domain();
    + switch (r->mode) {
    + char *buffer;
    + struct tomoyo_condition *cond;
    + case TOMOYO_CONFIG_LEARNING:
    + if (!tomoyo_domain_quota_ok(r))
    + return 0;
    + va_start(args, fmt);
    + len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4;
    + va_end(args);
    + buffer = kmalloc(len, GFP_KERNEL);
    + if (!buffer)
    + return 0;
    + va_start(args, fmt);
    + vsnprintf(buffer, len - 1, fmt, args);
    + va_end(args);
    + tomoyo_normalize_line(buffer);
    + if (r->ee && !strncmp(buffer, "allow_execute ", 14))
    + cond = tomoyo_get_execute_condition(r->ee);
    + else if (r->obj && r->obj->symlink_target)
    + cond = tomoyo_get_symlink_condition(r);
    + else if ((current->tomoyo_flags &
    + TOMOYO_TASK_IS_EXECUTE_HANDLER)) {
    + char str[] = "if task.type=execute_handler";
    + cond = tomoyo_get_condition(str);
    + } else
    + cond = NULL;
    + tomoyo_write_domain_policy2(buffer, r->domain, cond, false);
    + tomoyo_put_condition(cond);
    + kfree(buffer);
    + /* fall through */
    + case TOMOYO_CONFIG_PERMISSIVE:
    + return 0;
    + }
    + if (!atomic_read(&tomoyo_query_observers)) {
    + int i;
    + if (current->tomoyo_flags & TOMOYO_DONT_SLEEP_ON_ENFORCE_ERROR)
    + return -EPERM;
    + for (i = 0; i < tomoyo_profile(r->domain->profile)->enforcing->
    + enforcing_penalty; i++) {
    + set_current_state(TASK_INTERRUPTIBLE);
    + schedule_timeout(HZ / 10);
    + }
    + return -EPERM;
    + }
    + va_start(args, fmt);
    + len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32;
    + va_end(args);
    + header = tomoyo_init_audit_log(&len, r);
    + if (!header)
    + goto out;
    + tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_KERNEL);
    + if (!tomoyo_query_entry)
    + goto out;
    + len = tomoyo_round2(len);
    + tomoyo_query_entry->query = kzalloc(len, GFP_KERNEL);
    + if (!tomoyo_query_entry->query)
    + goto out;
    + INIT_LIST_HEAD(&tomoyo_query_entry->list);
    + spin_lock(&tomoyo_query_list_lock);
    + if (tomoyo_quota_for_query && tomoyo_query_memory_size + len +
    + sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) {
    + quota_exceeded = true;
    + } else {
    + tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry);
    + tomoyo_query_entry->serial = tomoyo_serial++;
    + }
    + spin_unlock(&tomoyo_query_list_lock);
    + if (quota_exceeded)
    + goto out;
    + pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s",
    + tomoyo_query_entry->serial, r->retry, header);
    + kfree(header);
    + header = NULL;
    + va_start(args, fmt);
    + vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args);
    + tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1;
    + va_end(args);
    + spin_lock(&tomoyo_query_list_lock);
    + list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list);
    + spin_unlock(&tomoyo_query_list_lock);
    + /* Give 10 seconds for supervisor's opinion. */
    + for (tomoyo_query_entry->timer = 0;
    + atomic_read(&tomoyo_query_observers) &&
    + tomoyo_query_entry->timer < 100;
    + tomoyo_query_entry->timer++) {
    + wake_up(&tomoyo_query_wait);
    + set_current_state(TASK_INTERRUPTIBLE);
    + schedule_timeout(HZ / 10);
    + if (tomoyo_query_entry->answer)
    + break;
    + }
    + spin_lock(&tomoyo_query_list_lock);
    + list_del(&tomoyo_query_entry->list);
    + tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry);
    + spin_unlock(&tomoyo_query_list_lock);
    + switch (tomoyo_query_entry->answer) {
    + case 3: /* Asked to retry by administrator. */
    + error = 1;
    + r->retry++;
    + break;
    + case 1:
    + /* Granted by administrator. */
    + error = 0;
    + break;
    + case 0:
    + /* Timed out. */
    + break;
    + default:
    + /* Rejected by administrator. */
    + break;
    + }
    + out:
    + if (tomoyo_query_entry)
    + kfree(tomoyo_query_entry->query);
    + kfree(tomoyo_query_entry);
    + kfree(header);
    + return error;
    +}
    +
    +/**
    + * tomoyo_poll_query - poll() for /sys/kernel/security/query.
    + *
    + * @file: Pointer to "struct file".
    + * @wait: Pointer to "poll_table".
    + *
    + * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
    + *
    + * Waits for access requests which violated policy in enforcing mode.
    + */
    +static int tomoyo_poll_query(struct file *file, poll_table *wait)
    +{
    + struct list_head *tmp;
    + bool found = false;
    + u8 i;
    + for (i = 0; i < 2; i++) {
    + spin_lock(&tomoyo_query_list_lock);
    + list_for_each(tmp, &tomoyo_query_list) {
    + struct tomoyo_query_entry *ptr
    + = list_entry(tmp, struct tomoyo_query_entry,
    + list);
    + if (ptr->answer)
    + continue;
    + found = true;
    + break;
    + }
    + spin_unlock(&tomoyo_query_list_lock);
    + if (found)
    + return POLLIN | POLLRDNORM;
    + if (i)
    + break;
    + poll_wait(file, &tomoyo_query_wait, wait);
    + }
    + return 0;
    +}
    +
    +/**
    + * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + */
    +static void tomoyo_read_query(struct tomoyo_io_buffer *head)
    +{
    + struct list_head *tmp;
    + int pos = 0;
    + int len = 0;
    + char *buf;
    + if (head->read_avail)
    + return;
    + if (head->read_buf) {
    + kfree(head->read_buf);
    + head->read_buf = NULL;
    + head->readbuf_size = 0;
    + }
    + spin_lock(&tomoyo_query_list_lock);
    + list_for_each(tmp, &tomoyo_query_list) {
    + struct tomoyo_query_entry *ptr
    + = list_entry(tmp, struct tomoyo_query_entry, list);
    + if (ptr->answer)
    + continue;
    + if (pos++ != head->read_step)
    + continue;
    + len = ptr->query_len;
    + break;
    + }
    + spin_unlock(&tomoyo_query_list_lock);
    + if (!len) {
    + head->read_step = 0;
    + return;
    + }
    + buf = kzalloc(len, GFP_KERNEL);
    + if (!buf)
    + return;
    + pos = 0;
    + spin_lock(&tomoyo_query_list_lock);
    + list_for_each(tmp, &tomoyo_query_list) {
    + struct tomoyo_query_entry *ptr
    + = list_entry(tmp, struct tomoyo_query_entry, list);
    + if (ptr->answer)
    + continue;
    + if (pos++ != head->read_step)
    + continue;
    + /*
    + * Some query can be skipped because tomoyo_query_list
    + * can change, but I don't care.
    + */
    + if (len == ptr->query_len)
    + memmove(buf, ptr->query, len);
    + break;
    + }
    + spin_unlock(&tomoyo_query_list_lock);
    + if (buf[0]) {
    + head->read_avail = len;
    + head->readbuf_size = head->read_avail;
    + head->read_buf = buf;
    + head->read_step++;
    + } else {
    + kfree(buf);
    + }
    +}
    +
    +/**
    + * tomoyo_write_answer - Write the supervisor's decision.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + *
    + * Returns 0 on success, -EINVAL otherwise.
    + */
    +static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
    +{
    + char *data = head->write_buf;
    + struct list_head *tmp;
    + unsigned int serial;
    + unsigned int answer;
    + spin_lock(&tomoyo_query_list_lock);
    + list_for_each(tmp, &tomoyo_query_list) {
    + struct tomoyo_query_entry *ptr
    + = list_entry(tmp, struct tomoyo_query_entry, list);
    + ptr->timer = 0;
    + }
    + spin_unlock(&tomoyo_query_list_lock);
    + if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
    + return -EINVAL;
    + spin_lock(&tomoyo_query_list_lock);
    + list_for_each(tmp, &tomoyo_query_list) {
    + struct tomoyo_query_entry *ptr
    + = list_entry(tmp, struct tomoyo_query_entry, list);
    + if (ptr->serial != serial)
    + continue;
    + if (!ptr->answer)
    + ptr->answer = answer;
    + break;
    + }
    + spin_unlock(&tomoyo_query_list_lock);
    + return 0;
    +}
    +
    +/**
    + * tomoyo_read_version: Get version.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + */
    +static void tomoyo_read_version(struct tomoyo_io_buffer *head)
    +{
    + if (head->read_eof)
    + return;
    + tomoyo_io_printf(head, "2.3.0-pre");
    + head->read_eof = true;
    +}
    +
    +/**
    + * tomoyo_read_self_domain - Get the current process's domainname.
    + *
    + * @head: Pointer to "struct tomoyo_io_buffer".
    + */
    +static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
    +{
    + if (head->read_eof)
    + return;
    + /*
    + * tomoyo_current_domain()->domainname != NULL because every process
    + * belongs to a domain and the domain's name cannot be NULL.
    + */
    + tomoyo_io_printf(head, "%s",
    + tomoyo_current_domain()->domainname->name);
    + head->read_eof = true;
    +}
    +
    +/**
    + * tomoyo_open_control - open() for /sys/kernel/security/ interface.
    + *
    + * @type: Type of interface.
    + * @file: Pointer to "struct file".
    + *
    + * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
    + */
    +int tomoyo_open_control(const u8 type, struct file *file)
    +{
    + struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_KERNEL);
    + if (!head)
    + return -ENOMEM;
    + mutex_init(&head->io_sem);
    + head->type = type;
    + switch (type) {
    + case TOMOYO_DOMAINPOLICY:
    + /* /sys/kernel/security/tomoyo/domain_policy */
    + head->write = tomoyo_write_domain_policy;
    + head->read = tomoyo_read_domain_policy;
    + break;
    + case TOMOYO_EXCEPTIONPOLICY:
    + /* /sys/kernel/security/tomoyo/exception_policy */
    + head->write = tomoyo_write_exception_policy;
    + head->read = tomoyo_read_exception_policy;
    + break;
    +#ifdef CONFIG_SECURITY_TOMOYO_AUDIT
    + case TOMOYO_GRANTLOG: /* /sys/kernel/security/tomoyo/grant_log */
    + head->poll = tomoyo_poll_grant_log;
    + head->read = tomoyo_read_grant_log;
    + break;
    + case TOMOYO_REJECTLOG: /* /sys/kernel/security/tomoyo/reject_log */
    + head->poll = tomoyo_poll_reject_log;
    + head->read = tomoyo_read_reject_log;
    + break;
    +#endif
    + case TOMOYO_SELFDOMAIN: /* /sys/kernel/security/tomoyo/self_domain */
    + head->read = tomoyo_read_self_domain;
    + break;
    + case TOMOYO_DOMAIN_STATUS:
    + /* /sys/kernel/security/tomoyo/.domain_status */
    + head->write = tomoyo_write_domain_profile;
    + head->read = tomoyo_read_domain_profile;
    + break;
    + case TOMOYO_EXECUTE_HANDLER:
    + /* /sys/kernel/security/tomoyo/.execute_handler */
    + /* Allow execute_handler to read process's status. */
    + if (!(current->tomoyo_flags &
    + TOMOYO_TASK_IS_EXECUTE_HANDLER)) {
    + kfree(head);
    + return -EPERM;
    + }
    + /* fall through */
    + case TOMOYO_PROCESS_STATUS:
    + /* /sys/kernel/security/tomoyo/.process_status */
    + head->write = tomoyo_write_pid;
    + head->read = tomoyo_read_pid;
    + break;
    + case TOMOYO_VERSION: /* /sys/kernel/security/tomoyo/version */
    + head->read = tomoyo_read_version;
    + head->readbuf_size = 128;
    + break;
    + case TOMOYO_MEMINFO: /* /sys/kernel/security/tomoyo/meminfo */
    + head->write = tomoyo_write_memory_quota;
    + head->read = tomoyo_read_memory_counter;
    + head->readbuf_size = 512;
    + break;
    + case TOMOYO_PROFILE: /* /sys/kernel/security/tomoyo/profile */
    + head->write = tomoyo_write_profile;
    + head->read = tomoyo_read_profile;
    + break;
    + case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
    + head->poll = tomoyo_poll_query;
    + head->write = tomoyo_write_answer;
    + head->read = tomoyo_read_query;
    + break;
    + case TOMOYO_MANAGER: /* /sys/kernel/security/tomoyo/manager */
    + head->write = tomoyo_write_manager_policy;
    + head->read = tomoyo_read_manager_policy;
    + break;
    + }
    + if (!(file->f_mode & FMODE_READ)) {
    + /*
    + * No need to allocate read_buf since it is not opened
    + * for reading.
    + */
    + head->read = NULL;
    + head->poll = NULL;
    + } else if (!head->poll) {
    + /* Don't allocate read_buf for poll() access. */
    + if (!head->readbuf_size)
    + head->readbuf_size = 4096;
    + head->read_buf = kzalloc(head->readbuf_size, GFP_KERNEL);
    + if (!head->read_buf) {
    + kfree(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;
    + head->write_buf = kzalloc(head->writebuf_size, GFP_KERNEL);
    + if (!head->write_buf) {
    + kfree(head->read_buf);
    + kfree(head);
    + return -ENOMEM;
    + }
    + }
    + /* This lock is released at tomoyo_close_control(). */
    + if (type != TOMOYO_QUERY &&
    + type != TOMOYO_GRANTLOG && type != TOMOYO_REJECTLOG)
    + head->reader_idx = tomoyo_read_lock();
    + 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 == TOMOYO_SELFDOMAIN)
    + tomoyo_read_control(file, NULL, 0);
    + /*
    + * If the file is /sys/kernel/security/tomoyo/query ,
    + * increment the observer counter.
    + * The obserber counter is used by tomoyo_supervisor() to see if
    + * there is some process monitoring /sys/kernel/security/tomoyo/query.
    + */
    + else if (type == TOMOYO_QUERY)
    + atomic_inc(&tomoyo_query_observers);
    + return 0;
    +}
    +
    +/**
    + * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
    + *
    + * @file: Pointer to "struct file".
    + * @wait: Pointer to "poll_table".
    + *
    + * Waits for read readiness.
    + * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
    + * /sys/kernel/security/tomoyo/grant_log and
    + * /sys/kernel/security/tomoyo/reject_log are handled by
    + * /usr/sbin/tomoyo-auditd .
    + */
    +int tomoyo_poll_control(struct file *file, poll_table *wait)
    +{
    + struct tomoyo_io_buffer *head = file->private_data;
    + if (!head->poll)
    + return -ENOSYS;
    + return head->poll(file, wait);
    +}
    +
    +/**
    + * tomoyo_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.
    + */
    +int tomoyo_read_control(struct file *file, char __user *buffer,
    + const int buffer_len)
    +{
    + int len = 0;
    + struct tomoyo_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;
    + while (1) {
    + /* Call the policy handler. */
    + head->read(head);
    + /* Write to buffer. */
    + len = head->read_avail;
    + if (len || head->poll || head->read_eof)
    + break;
    + len = head->readbuf_size * 2;
    + cp = kzalloc(len, GFP_KERNEL);
    + if (!cp) {
    + len = -ENOMEM;
    + goto out;
    + }
    + kfree(head->read_buf);
    + head->read_buf = cp;
    + head->readbuf_size = len;
    + }
    + 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;
    +}
    +
    +/**
    + * tomoyo_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.
    + */
    +int tomoyo_write_control(struct file *file, const char __user *buffer,
    + const int buffer_len)
    +{
    + struct tomoyo_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 != tomoyo_write_pid &&
    + head->write != tomoyo_write_domain_policy &&
    + !tomoyo_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) {
    + const int len = head->writebuf_size * 2;
    + char *cp = kzalloc(len, GFP_KERNEL);
    + if (!cp) {
    + error = -ENOMEM;
    + break;
    + }
    + memmove(cp, cp0, head->write_avail);
    + kfree(cp0);
    + head->write_buf = cp;
    + cp0 = cp;
    + head->writebuf_size = len;
    + }
    + 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;
    + tomoyo_normalize_line(cp0);
    + head->write(head);
    + }
    + mutex_unlock(&head->io_sem);
    + return error;
    +}
    +
    +/**
    + * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
    + *
    + * @file: Pointer to "struct file".
    + *
    + * Releases memory and returns 0.
    + */
    +int tomoyo_close_control(struct file *file)
    +{
    + struct tomoyo_io_buffer *head = file->private_data;
    + const bool is_write = head->write_buf != NULL;
    + const u8 type = head->type;
    + /*
    + * If the file is /sys/kernel/security/tomoyo/query ,
    + * decrement the observer counter.
    + */
    + if (type == TOMOYO_QUERY)
    + atomic_dec(&tomoyo_query_observers);
    + /* This lock is acquired at tomoyo_open_control(). */
    + if (type != TOMOYO_QUERY &&
    + type != TOMOYO_GRANTLOG && type != TOMOYO_REJECTLOG)
    + tomoyo_read_unlock(head->reader_idx);
    + /* Release memory used for policy I/O. */
    + kfree(head->read_buf);
    + head->read_buf = NULL;
    + kfree(head->write_buf);
    + head->write_buf = NULL;
    + kfree(head);
    + head = NULL;
    + file->private_data = NULL;
    + if (is_write)
    + tomoyo_run_gc();
    + return 0;
    +}
    --


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