mirror of https://gitee.com/openkylin/linux.git
TOMOYO: Enable conditional ACL.
Enable conditional ACL by passing object's pointers. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Tetsuo Handa
James Morris
parent
5b636857fe
commit
97fb35e413
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@ -836,7 +836,8 @@ int tomoyo_path2_perm(const u8 operation, struct path *path1,
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struct path *path2);
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int tomoyo_path_number_perm(const u8 operation, struct path *path,
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unsigned long number);
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int tomoyo_path_perm(const u8 operation, struct path *path);
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int tomoyo_path_perm(const u8 operation, struct path *path,
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const char *target);
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int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
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const struct tomoyo_path_info *filename);
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int tomoyo_poll_control(struct file *file, poll_table *wait);
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@ -575,23 +575,27 @@ struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
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*/
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int tomoyo_find_next_domain(struct linux_binprm *bprm)
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{
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struct tomoyo_request_info r;
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char *tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
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struct tomoyo_domain_info *old_domain = tomoyo_domain();
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struct tomoyo_domain_info *domain = NULL;
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const char *original_name = bprm->filename;
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u8 mode;
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bool is_enforce;
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int retval = -ENOMEM;
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bool need_kfree = false;
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bool reject_on_transition_failure = false;
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struct tomoyo_path_info rn = { }; /* real name */
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mode = tomoyo_init_request_info(&r, NULL, TOMOYO_MAC_FILE_EXECUTE);
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is_enforce = (mode == TOMOYO_CONFIG_ENFORCING);
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if (!tmp)
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goto out;
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struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS);
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if (!ee)
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return -ENOMEM;
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ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
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if (!ee->tmp) {
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kfree(ee);
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return -ENOMEM;
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}
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/* ee->dump->data is allocated by tomoyo_dump_page(). */
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tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE);
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ee->r.ee = ee;
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ee->bprm = bprm;
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ee->r.obj = &ee->obj;
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ee->obj.path1 = bprm->file->f_path;
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retry:
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if (need_kfree) {
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kfree(rn.name);
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@ -625,7 +629,7 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
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}
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/* Check execute permission. */
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retval = tomoyo_path_permission(&r, TOMOYO_TYPE_EXECUTE, &rn);
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retval = tomoyo_path_permission(&ee->r, TOMOYO_TYPE_EXECUTE, &rn);
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if (retval == TOMOYO_RETRY_REQUEST)
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goto retry;
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if (retval < 0)
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@ -636,12 +640,12 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
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* wildcard) rather than the pathname passed to execve()
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* (which never contains wildcard).
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*/
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if (r.param.path.matched_path) {
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if (ee->r.param.path.matched_path) {
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if (need_kfree)
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kfree(rn.name);
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need_kfree = false;
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/* This is OK because it is read only. */
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rn = *r.param.path.matched_path;
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rn = *ee->r.param.path.matched_path;
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}
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/* Calculate domain to transit to. */
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@ -649,7 +653,7 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
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&rn)) {
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case TOMOYO_TRANSITION_CONTROL_RESET:
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/* Transit to the root of specified namespace. */
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snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", rn.name);
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snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", rn.name);
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/*
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* Make do_execve() fail if domain transition across namespaces
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* has failed.
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@ -658,7 +662,7 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
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break;
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case TOMOYO_TRANSITION_CONTROL_INITIALIZE:
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/* Transit to the child of current namespace's root. */
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snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
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snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
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old_domain->ns->name, rn.name);
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break;
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case TOMOYO_TRANSITION_CONTROL_KEEP:
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@ -677,29 +681,30 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
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domain = old_domain;
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} else {
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/* Normal domain transition. */
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snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
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snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
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old_domain->domainname->name, rn.name);
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}
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break;
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}
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if (!domain)
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domain = tomoyo_assign_domain(tmp, true);
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domain = tomoyo_assign_domain(ee->tmp, true);
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if (domain)
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retval = 0;
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else if (reject_on_transition_failure) {
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printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n", tmp);
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printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n",
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ee->tmp);
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retval = -ENOMEM;
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} else if (r.mode == TOMOYO_CONFIG_ENFORCING)
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} else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING)
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retval = -ENOMEM;
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else {
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retval = 0;
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if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) {
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old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true;
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r.granted = false;
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tomoyo_write_log(&r, "%s", tomoyo_dif
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ee->r.granted = false;
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tomoyo_write_log(&ee->r, "%s", tomoyo_dif
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[TOMOYO_DIF_TRANSITION_FAILED]);
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printk(KERN_WARNING
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"ERROR: Domain '%s' not defined.\n", tmp);
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"ERROR: Domain '%s' not defined.\n", ee->tmp);
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}
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}
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out:
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@ -710,7 +715,9 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
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bprm->cred->security = domain;
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if (need_kfree)
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kfree(rn.name);
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kfree(tmp);
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kfree(ee->tmp);
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kfree(ee->dump.data);
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kfree(ee);
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return retval;
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}
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@ -667,6 +667,9 @@ int tomoyo_path_number_perm(const u8 type, struct path *path,
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unsigned long number)
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{
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struct tomoyo_request_info r;
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struct tomoyo_obj_info obj = {
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.path1 = *path,
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};
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int error = -ENOMEM;
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struct tomoyo_path_info buf;
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int idx;
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@ -677,6 +680,7 @@ int tomoyo_path_number_perm(const u8 type, struct path *path,
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idx = tomoyo_read_lock();
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if (!tomoyo_get_realpath(&buf, path))
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goto out;
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r.obj = &obj;
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if (type == TOMOYO_TYPE_MKDIR)
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tomoyo_add_slash(&buf);
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r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL;
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@ -711,6 +715,9 @@ int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
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int error = 0;
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struct tomoyo_path_info buf;
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struct tomoyo_request_info r;
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struct tomoyo_obj_info obj = {
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.path1 = *path,
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};
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int idx;
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buf.name = NULL;
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@ -723,6 +730,7 @@ int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
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error = -ENOMEM;
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goto out;
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}
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r.obj = &obj;
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if (acc_mode & MAY_READ)
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error = tomoyo_path_permission(&r, TOMOYO_TYPE_READ,
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&buf);
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@ -745,15 +753,21 @@ int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
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*
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* @operation: Type of operation.
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* @path: Pointer to "struct path".
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* @target: Symlink's target if @operation is TOMOYO_TYPE_SYMLINK,
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* NULL otherwise.
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*
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* Returns 0 on success, negative value otherwise.
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*/
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int tomoyo_path_perm(const u8 operation, struct path *path)
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int tomoyo_path_perm(const u8 operation, struct path *path, const char *target)
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{
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struct tomoyo_request_info r;
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struct tomoyo_obj_info obj = {
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.path1 = *path,
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};
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int error;
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struct tomoyo_path_info buf;
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bool is_enforce;
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struct tomoyo_path_info symlink_target;
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int idx;
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if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation])
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@ -765,13 +779,23 @@ int tomoyo_path_perm(const u8 operation, struct path *path)
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idx = tomoyo_read_lock();
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if (!tomoyo_get_realpath(&buf, path))
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goto out;
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r.obj = &obj;
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switch (operation) {
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case TOMOYO_TYPE_RMDIR:
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case TOMOYO_TYPE_CHROOT:
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tomoyo_add_slash(&buf);
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break;
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case TOMOYO_TYPE_SYMLINK:
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symlink_target.name = tomoyo_encode(target);
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if (!symlink_target.name)
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goto out;
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tomoyo_fill_path_info(&symlink_target);
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obj.symlink_target = &symlink_target;
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break;
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}
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error = tomoyo_path_permission(&r, operation, &buf);
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if (operation == TOMOYO_TYPE_SYMLINK)
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kfree(symlink_target.name);
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out:
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kfree(buf.name);
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tomoyo_read_unlock(idx);
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@ -794,6 +818,9 @@ int tomoyo_mkdev_perm(const u8 operation, struct path *path,
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const unsigned int mode, unsigned int dev)
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{
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struct tomoyo_request_info r;
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struct tomoyo_obj_info obj = {
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.path1 = *path,
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};
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int error = -ENOMEM;
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struct tomoyo_path_info buf;
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int idx;
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@ -804,6 +831,7 @@ int tomoyo_mkdev_perm(const u8 operation, struct path *path,
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idx = tomoyo_read_lock();
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error = -ENOMEM;
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if (tomoyo_get_realpath(&buf, path)) {
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r.obj = &obj;
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dev = new_decode_dev(dev);
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r.param_type = TOMOYO_TYPE_MKDEV_ACL;
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r.param.mkdev.filename = &buf;
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@ -837,6 +865,10 @@ int tomoyo_path2_perm(const u8 operation, struct path *path1,
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struct tomoyo_path_info buf1;
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struct tomoyo_path_info buf2;
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struct tomoyo_request_info r;
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struct tomoyo_obj_info obj = {
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.path1 = *path1,
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.path2 = *path2,
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};
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int idx;
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if (tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation])
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@ -861,6 +893,7 @@ int tomoyo_path2_perm(const u8 operation, struct path *path1,
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tomoyo_add_slash(&buf2);
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break;
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}
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r.obj = &obj;
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r.param_type = TOMOYO_TYPE_PATH2_ACL;
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r.param.path2.operation = operation;
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r.param.path2.filename1 = &buf1;
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@ -75,6 +75,7 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
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struct path *dir, const char *type,
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unsigned long flags)
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{
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struct tomoyo_obj_info obj = { };
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struct path path;
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struct file_system_type *fstype = NULL;
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const char *requested_type = NULL;
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@ -85,6 +86,7 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
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struct tomoyo_path_info rdir;
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int need_dev = 0;
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int error = -ENOMEM;
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r->obj = &obj;
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/* Get fstype. */
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requested_type = tomoyo_encode(type);
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@ -94,6 +96,7 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
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tomoyo_fill_path_info(&rtype);
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/* Get mount point. */
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obj.path2 = *dir;
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requested_dir_name = tomoyo_realpath_from_path(dir);
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if (!requested_dir_name) {
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error = -ENOMEM;
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@ -129,8 +132,8 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
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error = -ENOENT;
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goto out;
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}
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obj.path1 = path;
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requested_dev_name = tomoyo_realpath_from_path(&path);
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path_put(&path);
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if (!requested_dev_name) {
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error = -ENOENT;
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goto out;
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@ -163,6 +166,9 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
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if (fstype)
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put_filesystem(fstype);
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kfree(requested_type);
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/* Drop refcount obtained by kern_path(). */
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if (obj.path1.dentry)
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path_put(&obj.path1);
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return error;
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}
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@ -98,18 +98,18 @@ static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
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static int tomoyo_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
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{
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struct path path = { mnt, dentry };
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return tomoyo_path_perm(TOMOYO_TYPE_GETATTR, &path);
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return tomoyo_path_perm(TOMOYO_TYPE_GETATTR, &path, NULL);
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}
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static int tomoyo_path_truncate(struct path *path)
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{
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return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path);
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return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path, NULL);
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}
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static int tomoyo_path_unlink(struct path *parent, struct dentry *dentry)
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{
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struct path path = { parent->mnt, dentry };
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return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path);
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return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path, NULL);
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}
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static int tomoyo_path_mkdir(struct path *parent, struct dentry *dentry,
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@ -123,14 +123,14 @@ static int tomoyo_path_mkdir(struct path *parent, struct dentry *dentry,
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static int tomoyo_path_rmdir(struct path *parent, struct dentry *dentry)
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{
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struct path path = { parent->mnt, dentry };
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return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path);
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return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path, NULL);
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}
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static int tomoyo_path_symlink(struct path *parent, struct dentry *dentry,
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const char *old_name)
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{
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struct path path = { parent->mnt, dentry };
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return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path);
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return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path, old_name);
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}
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static int tomoyo_path_mknod(struct path *parent, struct dentry *dentry,
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@ -225,7 +225,7 @@ static int tomoyo_path_chown(struct path *path, uid_t uid, gid_t gid)
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static int tomoyo_path_chroot(struct path *path)
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{
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return tomoyo_path_perm(TOMOYO_TYPE_CHROOT, path);
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return tomoyo_path_perm(TOMOYO_TYPE_CHROOT, path, NULL);
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}
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static int tomoyo_sb_mount(char *dev_name, struct path *path,
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@ -237,7 +237,7 @@ static int tomoyo_sb_mount(char *dev_name, struct path *path,
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static int tomoyo_sb_umount(struct vfsmount *mnt, int flags)
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{
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struct path path = { mnt, mnt->mnt_root };
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return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path);
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return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path, NULL);
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}
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static int tomoyo_sb_pivotroot(struct path *old_path, struct path *new_path)
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