Revision 802b31c0dd7f44c9ab44d39c6c4af22d958ad803 authored by Linus Torvalds on 14 March 2021, 20:29:38 UTC, committed by Linus Torvalds on 14 March 2021, 20:29:38 UTC
Pull timer fix from Thomas Gleixner: "A single fix in for hrtimers to prevent an interrupt storm caused by the lack of reevaluation of the timers which expire in softirq context under certain circumstances, e.g. when the clock was set" * tag 'timers-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: hrtimer: Update softirq_expires_next correctly after __hrtimer_get_next_event()
domain.c
// SPDX-License-Identifier: GPL-2.0
/*
* security/tomoyo/domain.c
*
* Copyright (C) 2005-2011 NTT DATA CORPORATION
*/
#include "common.h"
#include <linux/binfmts.h>
#include <linux/slab.h>
#include <linux/rculist.h>
/* Variables definitions.*/
/* The initial domain. */
struct tomoyo_domain_info tomoyo_kernel_domain;
/**
* tomoyo_update_policy - Update an entry for exception policy.
*
* @new_entry: Pointer to "struct tomoyo_acl_info".
* @size: Size of @new_entry in bytes.
* @param: Pointer to "struct tomoyo_acl_param".
* @check_duplicate: Callback function to find duplicated entry.
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size,
struct tomoyo_acl_param *param,
bool (*check_duplicate)(const struct tomoyo_acl_head
*,
const struct tomoyo_acl_head
*))
{
int error = param->is_delete ? -ENOENT : -ENOMEM;
struct tomoyo_acl_head *entry;
struct list_head *list = param->list;
if (mutex_lock_interruptible(&tomoyo_policy_lock))
return -ENOMEM;
list_for_each_entry_rcu(entry, list, list,
srcu_read_lock_held(&tomoyo_ss)) {
if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS)
continue;
if (!check_duplicate(entry, new_entry))
continue;
entry->is_deleted = param->is_delete;
error = 0;
break;
}
if (error && !param->is_delete) {
entry = tomoyo_commit_ok(new_entry, size);
if (entry) {
list_add_tail_rcu(&entry->list, list);
error = 0;
}
}
mutex_unlock(&tomoyo_policy_lock);
return error;
}
/**
* tomoyo_same_acl_head - Check for duplicated "struct tomoyo_acl_info" entry.
*
* @a: Pointer to "struct tomoyo_acl_info".
* @b: Pointer to "struct tomoyo_acl_info".
*
* Returns true if @a == @b, false otherwise.
*/
static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a,
const struct tomoyo_acl_info *b)
{
return a->type == b->type && a->cond == b->cond;
}
/**
* tomoyo_update_domain - Update an entry for domain policy.
*
* @new_entry: Pointer to "struct tomoyo_acl_info".
* @size: Size of @new_entry in bytes.
* @param: Pointer to "struct tomoyo_acl_param".
* @check_duplicate: Callback function to find duplicated entry.
* @merge_duplicate: Callback function to merge duplicated entry.
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size,
struct tomoyo_acl_param *param,
bool (*check_duplicate)(const struct tomoyo_acl_info
*,
const struct tomoyo_acl_info
*),
bool (*merge_duplicate)(struct tomoyo_acl_info *,
struct tomoyo_acl_info *,
const bool))
{
const bool is_delete = param->is_delete;
int error = is_delete ? -ENOENT : -ENOMEM;
struct tomoyo_acl_info *entry;
struct list_head * const list = param->list;
if (param->data[0]) {
new_entry->cond = tomoyo_get_condition(param);
if (!new_entry->cond)
return -EINVAL;
/*
* Domain transition preference is allowed for only
* "file execute" entries.
*/
if (new_entry->cond->transit &&
!(new_entry->type == TOMOYO_TYPE_PATH_ACL &&
container_of(new_entry, struct tomoyo_path_acl, head)
->perm == 1 << TOMOYO_TYPE_EXECUTE))
goto out;
}
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(entry, list, list,
srcu_read_lock_held(&tomoyo_ss)) {
if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS)
continue;
if (!tomoyo_same_acl_head(entry, new_entry) ||
!check_duplicate(entry, new_entry))
continue;
if (merge_duplicate)
entry->is_deleted = merge_duplicate(entry, new_entry,
is_delete);
else
entry->is_deleted = is_delete;
error = 0;
break;
}
if (error && !is_delete) {
entry = tomoyo_commit_ok(new_entry, size);
if (entry) {
list_add_tail_rcu(&entry->list, list);
error = 0;
}
}
mutex_unlock(&tomoyo_policy_lock);
out:
tomoyo_put_condition(new_entry->cond);
return error;
}
/**
* tomoyo_check_acl - Do permission check.
*
* @r: Pointer to "struct tomoyo_request_info".
* @check_entry: Callback function to check type specific parameters.
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
void tomoyo_check_acl(struct tomoyo_request_info *r,
bool (*check_entry)(struct tomoyo_request_info *,
const struct tomoyo_acl_info *))
{
const struct tomoyo_domain_info *domain = r->domain;
struct tomoyo_acl_info *ptr;
const struct list_head *list = &domain->acl_info_list;
u16 i = 0;
retry:
list_for_each_entry_rcu(ptr, list, list,
srcu_read_lock_held(&tomoyo_ss)) {
if (ptr->is_deleted || ptr->type != r->param_type)
continue;
if (!check_entry(r, ptr))
continue;
if (!tomoyo_condition(r, ptr->cond))
continue;
r->matched_acl = ptr;
r->granted = true;
return;
}
for (; i < TOMOYO_MAX_ACL_GROUPS; i++) {
if (!test_bit(i, domain->group))
continue;
list = &domain->ns->acl_group[i++];
goto retry;
}
r->granted = false;
}
/* The list for "struct tomoyo_domain_info". */
LIST_HEAD(tomoyo_domain_list);
/**
* tomoyo_last_word - Get last component of a domainname.
*
* @name: Domainname to check.
*
* Returns the last word of @domainname.
*/
static const char *tomoyo_last_word(const char *name)
{
const char *cp = strrchr(name, ' ');
if (cp)
return cp + 1;
return name;
}
/**
* tomoyo_same_transition_control - Check for duplicated "struct tomoyo_transition_control" entry.
*
* @a: Pointer to "struct tomoyo_acl_head".
* @b: Pointer to "struct tomoyo_acl_head".
*
* Returns true if @a == @b, false otherwise.
*/
static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a,
const struct tomoyo_acl_head *b)
{
const struct tomoyo_transition_control *p1 = container_of(a,
typeof(*p1),
head);
const struct tomoyo_transition_control *p2 = container_of(b,
typeof(*p2),
head);
return p1->type == p2->type && p1->is_last_name == p2->is_last_name
&& p1->domainname == p2->domainname
&& p1->program == p2->program;
}
/**
* tomoyo_write_transition_control - Write "struct tomoyo_transition_control" list.
*
* @param: Pointer to "struct tomoyo_acl_param".
* @type: Type of this entry.
*
* Returns 0 on success, negative value otherwise.
*/
int tomoyo_write_transition_control(struct tomoyo_acl_param *param,
const u8 type)
{
struct tomoyo_transition_control e = { .type = type };
int error = param->is_delete ? -ENOENT : -ENOMEM;
char *program = param->data;
char *domainname = strstr(program, " from ");
if (domainname) {
*domainname = '\0';
domainname += 6;
} else if (type == TOMOYO_TRANSITION_CONTROL_NO_KEEP ||
type == TOMOYO_TRANSITION_CONTROL_KEEP) {
domainname = program;
program = NULL;
}
if (program && strcmp(program, "any")) {
if (!tomoyo_correct_path(program))
return -EINVAL;
e.program = tomoyo_get_name(program);
if (!e.program)
goto out;
}
if (domainname && strcmp(domainname, "any")) {
if (!tomoyo_correct_domain(domainname)) {
if (!tomoyo_correct_path(domainname))
goto out;
e.is_last_name = true;
}
e.domainname = tomoyo_get_name(domainname);
if (!e.domainname)
goto out;
}
param->list = ¶m->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
error = tomoyo_update_policy(&e.head, sizeof(e), param,
tomoyo_same_transition_control);
out:
tomoyo_put_name(e.domainname);
tomoyo_put_name(e.program);
return error;
}
/**
* tomoyo_scan_transition - Try to find specific domain transition type.
*
* @list: Pointer to "struct list_head".
* @domainname: The name of current domain.
* @program: The name of requested program.
* @last_name: The last component of @domainname.
* @type: One of values in "enum tomoyo_transition_type".
*
* Returns true if found one, false otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static inline bool tomoyo_scan_transition
(const struct list_head *list, const struct tomoyo_path_info *domainname,
const struct tomoyo_path_info *program, const char *last_name,
const enum tomoyo_transition_type type)
{
const struct tomoyo_transition_control *ptr;
list_for_each_entry_rcu(ptr, list, head.list,
srcu_read_lock_held(&tomoyo_ss)) {
if (ptr->head.is_deleted || ptr->type != type)
continue;
if (ptr->domainname) {
if (!ptr->is_last_name) {
if (ptr->domainname != domainname)
continue;
} else {
/*
* Use direct strcmp() since this is
* unlikely used.
*/
if (strcmp(ptr->domainname->name, last_name))
continue;
}
}
if (ptr->program && tomoyo_pathcmp(ptr->program, program))
continue;
return true;
}
return false;
}
/**
* tomoyo_transition_type - Get domain transition type.
*
* @ns: Pointer to "struct tomoyo_policy_namespace".
* @domainname: The name of current domain.
* @program: The name of requested program.
*
* Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes
* domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if
* executing @program reinitializes domain transition within that namespace,
* TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname ,
* others otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static enum tomoyo_transition_type tomoyo_transition_type
(const struct tomoyo_policy_namespace *ns,
const struct tomoyo_path_info *domainname,
const struct tomoyo_path_info *program)
{
const char *last_name = tomoyo_last_word(domainname->name);
enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET;
while (type < TOMOYO_MAX_TRANSITION_TYPE) {
const struct list_head * const list =
&ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
if (!tomoyo_scan_transition(list, domainname, program,
last_name, type)) {
type++;
continue;
}
if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET &&
type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE)
break;
/*
* Do not check for reset_domain if no_reset_domain matched.
* Do not check for initialize_domain if no_initialize_domain
* matched.
*/
type++;
type++;
}
return type;
}
/**
* tomoyo_same_aggregator - Check for duplicated "struct tomoyo_aggregator" entry.
*
* @a: Pointer to "struct tomoyo_acl_head".
* @b: Pointer to "struct tomoyo_acl_head".
*
* Returns true if @a == @b, false otherwise.
*/
static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a,
const struct tomoyo_acl_head *b)
{
const struct tomoyo_aggregator *p1 = container_of(a, typeof(*p1),
head);
const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2),
head);
return p1->original_name == p2->original_name &&
p1->aggregated_name == p2->aggregated_name;
}
/**
* tomoyo_write_aggregator - Write "struct tomoyo_aggregator" list.
*
* @param: Pointer to "struct tomoyo_acl_param".
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
int tomoyo_write_aggregator(struct tomoyo_acl_param *param)
{
struct tomoyo_aggregator e = { };
int error = param->is_delete ? -ENOENT : -ENOMEM;
const char *original_name = tomoyo_read_token(param);
const char *aggregated_name = tomoyo_read_token(param);
if (!tomoyo_correct_word(original_name) ||
!tomoyo_correct_path(aggregated_name))
return -EINVAL;
e.original_name = tomoyo_get_name(original_name);
e.aggregated_name = tomoyo_get_name(aggregated_name);
if (!e.original_name || !e.aggregated_name ||
e.aggregated_name->is_patterned) /* No patterns allowed. */
goto out;
param->list = ¶m->ns->policy_list[TOMOYO_ID_AGGREGATOR];
error = tomoyo_update_policy(&e.head, sizeof(e), param,
tomoyo_same_aggregator);
out:
tomoyo_put_name(e.original_name);
tomoyo_put_name(e.aggregated_name);
return error;
}
/**
* tomoyo_find_namespace - Find specified namespace.
*
* @name: Name of namespace to find.
* @len: Length of @name.
*
* Returns pointer to "struct tomoyo_policy_namespace" if found,
* NULL otherwise.
*
* Caller holds tomoyo_read_lock().
*/
static struct tomoyo_policy_namespace *tomoyo_find_namespace
(const char *name, const unsigned int len)
{
struct tomoyo_policy_namespace *ns;
list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) {
if (strncmp(name, ns->name, len) ||
(name[len] && name[len] != ' '))
continue;
return ns;
}
return NULL;
}
/**
* tomoyo_assign_namespace - Create a new namespace.
*
* @domainname: Name of namespace to create.
*
* Returns pointer to "struct tomoyo_policy_namespace" on success,
* NULL otherwise.
*
* Caller holds tomoyo_read_lock().
*/
struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname)
{
struct tomoyo_policy_namespace *ptr;
struct tomoyo_policy_namespace *entry;
const char *cp = domainname;
unsigned int len = 0;
while (*cp && *cp++ != ' ')
len++;
ptr = tomoyo_find_namespace(domainname, len);
if (ptr)
return ptr;
if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname))
return NULL;
entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS | __GFP_NOWARN);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
ptr = tomoyo_find_namespace(domainname, len);
if (!ptr && tomoyo_memory_ok(entry)) {
char *name = (char *) (entry + 1);
ptr = entry;
memmove(name, domainname, len);
name[len] = '\0';
entry->name = name;
tomoyo_init_policy_namespace(entry);
entry = NULL;
}
mutex_unlock(&tomoyo_policy_lock);
out:
kfree(entry);
return ptr;
}
/**
* tomoyo_namespace_jump - Check for namespace jump.
*
* @domainname: Name of domain.
*
* Returns true if namespace differs, false otherwise.
*/
static bool tomoyo_namespace_jump(const char *domainname)
{
const char *namespace = tomoyo_current_namespace()->name;
const int len = strlen(namespace);
return strncmp(domainname, namespace, len) ||
(domainname[len] && domainname[len] != ' ');
}
/**
* tomoyo_assign_domain - Create a domain or a namespace.
*
* @domainname: The name of domain.
* @transit: True if transit to domain found or created.
*
* Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise.
*
* Caller holds tomoyo_read_lock().
*/
struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
const bool transit)
{
struct tomoyo_domain_info e = { };
struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname);
bool created = false;
if (entry) {
if (transit) {
/*
* Since namespace is created at runtime, profiles may
* not be created by the moment the process transits to
* that domain. Do not perform domain transition if
* profile for that domain is not yet created.
*/
if (tomoyo_policy_loaded &&
!entry->ns->profile_ptr[entry->profile])
return NULL;
}
return entry;
}
/* Requested domain does not exist. */
/* Don't create requested domain if domainname is invalid. */
if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 ||
!tomoyo_correct_domain(domainname))
return NULL;
/*
* Since definition of profiles and acl_groups may differ across
* namespaces, do not inherit "use_profile" and "use_group" settings
* by automatically creating requested domain upon domain transition.
*/
if (transit && tomoyo_namespace_jump(domainname))
return NULL;
e.ns = tomoyo_assign_namespace(domainname);
if (!e.ns)
return NULL;
/*
* "use_profile" and "use_group" settings for automatically created
* domains are inherited from current domain. These are 0 for manually
* created domains.
*/
if (transit) {
const struct tomoyo_domain_info *domain = tomoyo_domain();
e.profile = domain->profile;
memcpy(e.group, domain->group, sizeof(e.group));
}
e.domainname = tomoyo_get_name(domainname);
if (!e.domainname)
return NULL;
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
entry = tomoyo_find_domain(domainname);
if (!entry) {
entry = tomoyo_commit_ok(&e, sizeof(e));
if (entry) {
INIT_LIST_HEAD(&entry->acl_info_list);
list_add_tail_rcu(&entry->list, &tomoyo_domain_list);
created = true;
}
}
mutex_unlock(&tomoyo_policy_lock);
out:
tomoyo_put_name(e.domainname);
if (entry && transit) {
if (created) {
struct tomoyo_request_info r;
int i;
tomoyo_init_request_info(&r, entry,
TOMOYO_MAC_FILE_EXECUTE);
r.granted = false;
tomoyo_write_log(&r, "use_profile %u\n",
entry->profile);
for (i = 0; i < TOMOYO_MAX_ACL_GROUPS; i++)
if (test_bit(i, entry->group))
tomoyo_write_log(&r, "use_group %u\n",
i);
tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
}
}
return entry;
}
/**
* tomoyo_environ - Check permission for environment variable names.
*
* @ee: Pointer to "struct tomoyo_execve".
*
* Returns 0 on success, negative value otherwise.
*/
static int tomoyo_environ(struct tomoyo_execve *ee)
{
struct tomoyo_request_info *r = &ee->r;
struct linux_binprm *bprm = ee->bprm;
/* env_page.data is allocated by tomoyo_dump_page(). */
struct tomoyo_page_dump env_page = { };
char *arg_ptr; /* Size is TOMOYO_EXEC_TMPSIZE bytes */
int arg_len = 0;
unsigned long pos = bprm->p;
int offset = pos % PAGE_SIZE;
int argv_count = bprm->argc;
int envp_count = bprm->envc;
int error = -ENOMEM;
ee->r.type = TOMOYO_MAC_ENVIRON;
ee->r.profile = r->domain->profile;
ee->r.mode = tomoyo_get_mode(r->domain->ns, ee->r.profile,
TOMOYO_MAC_ENVIRON);
if (!r->mode || !envp_count)
return 0;
arg_ptr = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
if (!arg_ptr)
goto out;
while (error == -ENOMEM) {
if (!tomoyo_dump_page(bprm, pos, &env_page))
goto out;
pos += PAGE_SIZE - offset;
/* Read. */
while (argv_count && offset < PAGE_SIZE) {
if (!env_page.data[offset++])
argv_count--;
}
if (argv_count) {
offset = 0;
continue;
}
while (offset < PAGE_SIZE) {
const unsigned char c = env_page.data[offset++];
if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) {
if (c == '=') {
arg_ptr[arg_len++] = '\0';
} else 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';
}
if (c)
continue;
if (tomoyo_env_perm(r, arg_ptr)) {
error = -EPERM;
break;
}
if (!--envp_count) {
error = 0;
break;
}
arg_len = 0;
}
offset = 0;
}
out:
if (r->mode != TOMOYO_CONFIG_ENFORCING)
error = 0;
kfree(env_page.data);
kfree(arg_ptr);
return error;
}
/**
* tomoyo_find_next_domain - Find a domain.
*
* @bprm: Pointer to "struct linux_binprm".
*
* Returns 0 on success, negative value otherwise.
*
* Caller holds tomoyo_read_lock().
*/
int tomoyo_find_next_domain(struct linux_binprm *bprm)
{
struct tomoyo_domain_info *old_domain = tomoyo_domain();
struct tomoyo_domain_info *domain = NULL;
const char *original_name = bprm->filename;
int retval = -ENOMEM;
bool reject_on_transition_failure = false;
const struct tomoyo_path_info *candidate;
struct tomoyo_path_info exename;
struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS);
if (!ee)
return -ENOMEM;
ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
if (!ee->tmp) {
kfree(ee);
return -ENOMEM;
}
/* ee->dump->data is allocated by tomoyo_dump_page(). */
tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE);
ee->r.ee = ee;
ee->bprm = bprm;
ee->r.obj = &ee->obj;
ee->obj.path1 = bprm->file->f_path;
/* Get symlink's pathname of program. */
retval = -ENOENT;
exename.name = tomoyo_realpath_nofollow(original_name);
if (!exename.name)
goto out;
tomoyo_fill_path_info(&exename);
retry:
/* Check 'aggregator' directive. */
{
struct tomoyo_aggregator *ptr;
struct list_head *list =
&old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR];
/* Check 'aggregator' directive. */
candidate = &exename;
list_for_each_entry_rcu(ptr, list, head.list,
srcu_read_lock_held(&tomoyo_ss)) {
if (ptr->head.is_deleted ||
!tomoyo_path_matches_pattern(&exename,
ptr->original_name))
continue;
candidate = ptr->aggregated_name;
break;
}
}
/* Check execute permission. */
retval = tomoyo_execute_permission(&ee->r, candidate);
if (retval == TOMOYO_RETRY_REQUEST)
goto retry;
if (retval < 0)
goto out;
/*
* To be able to specify domainnames with wildcards, use the
* pathname specified in the policy (which may contain
* wildcard) rather than the pathname passed to execve()
* (which never contains wildcard).
*/
if (ee->r.param.path.matched_path)
candidate = ee->r.param.path.matched_path;
/*
* Check for domain transition preference if "file execute" matched.
* If preference is given, make execve() fail if domain transition
* has failed, for domain transition preference should be used with
* destination domain defined.
*/
if (ee->transition) {
const char *domainname = ee->transition->name;
reject_on_transition_failure = true;
if (!strcmp(domainname, "keep"))
goto force_keep_domain;
if (!strcmp(domainname, "child"))
goto force_child_domain;
if (!strcmp(domainname, "reset"))
goto force_reset_domain;
if (!strcmp(domainname, "initialize"))
goto force_initialize_domain;
if (!strcmp(domainname, "parent")) {
char *cp;
strncpy(ee->tmp, old_domain->domainname->name,
TOMOYO_EXEC_TMPSIZE - 1);
cp = strrchr(ee->tmp, ' ');
if (cp)
*cp = '\0';
} else if (*domainname == '<')
strncpy(ee->tmp, domainname, TOMOYO_EXEC_TMPSIZE - 1);
else
snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
old_domain->domainname->name, domainname);
goto force_jump_domain;
}
/*
* No domain transition preference specified.
* Calculate domain to transit to.
*/
switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname,
candidate)) {
case TOMOYO_TRANSITION_CONTROL_RESET:
force_reset_domain:
/* Transit to the root of specified namespace. */
snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>",
candidate->name);
/*
* Make execve() fail if domain transition across namespaces
* has failed.
*/
reject_on_transition_failure = true;
break;
case TOMOYO_TRANSITION_CONTROL_INITIALIZE:
force_initialize_domain:
/* Transit to the child of current namespace's root. */
snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
old_domain->ns->name, candidate->name);
break;
case TOMOYO_TRANSITION_CONTROL_KEEP:
force_keep_domain:
/* Keep current domain. */
domain = old_domain;
break;
default:
if (old_domain == &tomoyo_kernel_domain &&
!tomoyo_policy_loaded) {
/*
* Needn't to transit from kernel domain before
* starting /sbin/init. But transit from kernel domain
* if executing initializers because they might start
* before /sbin/init.
*/
domain = old_domain;
break;
}
force_child_domain:
/* Normal domain transition. */
snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
old_domain->domainname->name, candidate->name);
break;
}
force_jump_domain:
if (!domain)
domain = tomoyo_assign_domain(ee->tmp, true);
if (domain)
retval = 0;
else if (reject_on_transition_failure) {
pr_warn("ERROR: Domain '%s' not ready.\n", ee->tmp);
retval = -ENOMEM;
} else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING)
retval = -ENOMEM;
else {
retval = 0;
if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) {
old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true;
ee->r.granted = false;
tomoyo_write_log(&ee->r, "%s", tomoyo_dif
[TOMOYO_DIF_TRANSITION_FAILED]);
pr_warn("ERROR: Domain '%s' not defined.\n", ee->tmp);
}
}
out:
if (!domain)
domain = old_domain;
/* Update reference count on "struct tomoyo_domain_info". */
{
struct tomoyo_task *s = tomoyo_task(current);
s->old_domain_info = s->domain_info;
s->domain_info = domain;
atomic_inc(&domain->users);
}
kfree(exename.name);
if (!retval) {
ee->r.domain = domain;
retval = tomoyo_environ(ee);
}
kfree(ee->tmp);
kfree(ee->dump.data);
kfree(ee);
return retval;
}
/**
* tomoyo_dump_page - Dump a page to buffer.
*
* @bprm: Pointer to "struct linux_binprm".
* @pos: Location to dump.
* @dump: Pointer to "struct tomoyo_page_dump".
*
* Returns true on success, false otherwise.
*/
bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos,
struct tomoyo_page_dump *dump)
{
struct page *page;
/* dump->data is released by tomoyo_find_next_domain(). */
if (!dump->data) {
dump->data = kzalloc(PAGE_SIZE, GFP_NOFS);
if (!dump->data)
return false;
}
/* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */
#ifdef CONFIG_MMU
/*
* This is called at execve() time in order to dig around
* in the argv/environment of the new proceess
* (represented by bprm). 'current' is the process doing
* the execve().
*/
if (get_user_pages_remote(bprm->mm, pos, 1,
FOLL_FORCE, &page, NULL, NULL) <= 0)
return false;
#else
page = bprm->page[pos / PAGE_SIZE];
#endif
if (page != dump->page) {
const unsigned int offset = pos % PAGE_SIZE;
/*
* Maybe kmap()/kunmap() should be used here.
* But remove_arg_zero() uses kmap_atomic()/kunmap_atomic().
* So do I.
*/
char *kaddr = kmap_atomic(page);
dump->page = page;
memcpy(dump->data + offset, kaddr + offset,
PAGE_SIZE - offset);
kunmap_atomic(kaddr);
}
/* Same with put_arg_page(page) in fs/exec.c */
#ifdef CONFIG_MMU
put_page(page);
#endif
return true;
}
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