1 // SPDX-License-Identifier: BSD-2-Clause 2 /* 3 * Copyright (c) 2014, STMicroelectronics International N.V. 4 * Copyright (c) 2015, Linaro Limited 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright notice, 11 * this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright notice, 14 * this list of conditions and the following disclaimer in the documentation 15 * and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 21 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <kernel/tee_ta_manager.h> 31 #include <mm/tee_mmu.h> 32 #include <tee/cache.h> 33 #include <tee/svc_cache.h> 34 35 TEE_Result syscall_cache_operation(void *va, size_t len, unsigned long op) 36 { 37 TEE_Result res; 38 struct tee_ta_session *sess; 39 struct user_ta_ctx *utc; 40 41 res = tee_ta_get_current_session(&sess); 42 if (res != TEE_SUCCESS) 43 return res; 44 45 if ((sess->ctx->flags & TA_FLAG_CACHE_MAINTENANCE) == 0) 46 return TEE_ERROR_NOT_SUPPORTED; 47 48 utc = to_user_ta_ctx(sess->ctx); 49 50 /* 51 * TAs are allowed to operate cache maintenance on TA memref parameters 52 * only, not on the TA private memory. 53 */ 54 if (tee_mmu_is_vbuf_intersect_ta_private(utc, va, len)) 55 return TEE_ERROR_ACCESS_DENIED; 56 57 res = tee_mmu_check_access_rights(utc, TEE_MEMORY_ACCESS_READ | 58 TEE_MEMORY_ACCESS_ANY_OWNER, 59 (uaddr_t)va, len); 60 if (res != TEE_SUCCESS) 61 return TEE_ERROR_ACCESS_DENIED; 62 63 return cache_operation(op, va, len); 64 } 65