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