cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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environ.c (3153B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * security/tomoyo/environ.c
      4 *
      5 * Copyright (C) 2005-2011  NTT DATA CORPORATION
      6 */
      7
      8#include "common.h"
      9
     10/**
     11 * tomoyo_check_env_acl - Check permission for environment variable's name.
     12 *
     13 * @r:   Pointer to "struct tomoyo_request_info".
     14 * @ptr: Pointer to "struct tomoyo_acl_info".
     15 *
     16 * Returns true if granted, false otherwise.
     17 */
     18static bool tomoyo_check_env_acl(struct tomoyo_request_info *r,
     19				 const struct tomoyo_acl_info *ptr)
     20{
     21	const struct tomoyo_env_acl *acl =
     22		container_of(ptr, typeof(*acl), head);
     23
     24	return tomoyo_path_matches_pattern(r->param.environ.name, acl->env);
     25}
     26
     27/**
     28 * tomoyo_audit_env_log - Audit environment variable name log.
     29 *
     30 * @r: Pointer to "struct tomoyo_request_info".
     31 *
     32 * Returns 0 on success, negative value otherwise.
     33 */
     34static int tomoyo_audit_env_log(struct tomoyo_request_info *r)
     35{
     36	return tomoyo_supervisor(r, "misc env %s\n",
     37				 r->param.environ.name->name);
     38}
     39
     40/**
     41 * tomoyo_env_perm - Check permission for environment variable's name.
     42 *
     43 * @r:   Pointer to "struct tomoyo_request_info".
     44 * @env: The name of environment variable.
     45 *
     46 * Returns 0 on success, negative value otherwise.
     47 *
     48 * Caller holds tomoyo_read_lock().
     49 */
     50int tomoyo_env_perm(struct tomoyo_request_info *r, const char *env)
     51{
     52	struct tomoyo_path_info environ;
     53	int error;
     54
     55	if (!env || !*env)
     56		return 0;
     57	environ.name = env;
     58	tomoyo_fill_path_info(&environ);
     59	r->param_type = TOMOYO_TYPE_ENV_ACL;
     60	r->param.environ.name = &environ;
     61	do {
     62		tomoyo_check_acl(r, tomoyo_check_env_acl);
     63		error = tomoyo_audit_env_log(r);
     64	} while (error == TOMOYO_RETRY_REQUEST);
     65	return error;
     66}
     67
     68/**
     69 * tomoyo_same_env_acl - Check for duplicated "struct tomoyo_env_acl" entry.
     70 *
     71 * @a: Pointer to "struct tomoyo_acl_info".
     72 * @b: Pointer to "struct tomoyo_acl_info".
     73 *
     74 * Returns true if @a == @b, false otherwise.
     75 */
     76static bool tomoyo_same_env_acl(const struct tomoyo_acl_info *a,
     77				const struct tomoyo_acl_info *b)
     78{
     79	const struct tomoyo_env_acl *p1 = container_of(a, typeof(*p1), head);
     80	const struct tomoyo_env_acl *p2 = container_of(b, typeof(*p2), head);
     81
     82	return p1->env == p2->env;
     83}
     84
     85/**
     86 * tomoyo_write_env - Write "struct tomoyo_env_acl" list.
     87 *
     88 * @param: Pointer to "struct tomoyo_acl_param".
     89 *
     90 * Returns 0 on success, negative value otherwise.
     91 *
     92 * Caller holds tomoyo_read_lock().
     93 */
     94static int tomoyo_write_env(struct tomoyo_acl_param *param)
     95{
     96	struct tomoyo_env_acl e = { .head.type = TOMOYO_TYPE_ENV_ACL };
     97	int error = -ENOMEM;
     98	const char *data = tomoyo_read_token(param);
     99
    100	if (!tomoyo_correct_word(data) || strchr(data, '='))
    101		return -EINVAL;
    102	e.env = tomoyo_get_name(data);
    103	if (!e.env)
    104		return error;
    105	error = tomoyo_update_domain(&e.head, sizeof(e), param,
    106				  tomoyo_same_env_acl, NULL);
    107	tomoyo_put_name(e.env);
    108	return error;
    109}
    110
    111/**
    112 * tomoyo_write_misc - Update environment variable list.
    113 *
    114 * @param: Pointer to "struct tomoyo_acl_param".
    115 *
    116 * Returns 0 on success, negative value otherwise.
    117 */
    118int tomoyo_write_misc(struct tomoyo_acl_param *param)
    119{
    120	if (tomoyo_str_starts(&param->data, "env "))
    121		return tomoyo_write_env(param);
    122	return -EINVAL;
    123}