1 /* 2 * Copyright (c) 2014, STMicroelectronics International N.V. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <tee/tee_pobj.h> 29 #include <kernel/tee_core_trace.h> 30 31 #include <string.h> 32 #include <stdlib.h> 33 34 static TAILQ_HEAD(tee_pobjs, tee_pobj) tee_pobjs = 35 TAILQ_HEAD_INITIALIZER(tee_pobjs); 36 37 static TEE_Result tee_pobj_check_access(uint32_t oflags, uint32_t nflags) 38 { 39 /* meta is exclusive */ 40 if (oflags | TEE_DATA_FLAG_ACCESS_WRITE_META || 41 nflags | TEE_DATA_FLAG_ACCESS_WRITE_META) 42 return TEE_ERROR_ACCESS_CONFLICT; 43 44 if (oflags | TEE_DATA_FLAG_ACCESS_READ && 45 !((nflags | TEE_DATA_FLAG_SHARE_READ) && 46 oflags | TEE_DATA_FLAG_SHARE_READ)) 47 return TEE_ERROR_ACCESS_CONFLICT; 48 49 if (oflags | TEE_DATA_FLAG_ACCESS_WRITE && 50 !((nflags | TEE_DATA_FLAG_SHARE_WRITE) && 51 oflags | TEE_DATA_FLAG_SHARE_WRITE)) 52 return TEE_ERROR_ACCESS_CONFLICT; 53 54 return TEE_SUCCESS; 55 } 56 57 TEE_Result tee_pobj_get(TEE_UUID *uuid, void *obj_id, uint32_t obj_id_len, 58 uint32_t flags, struct tee_pobj **obj) 59 { 60 struct tee_pobj *o; 61 TEE_Result res; 62 63 *obj = NULL; 64 65 /* Check if file is open */ 66 TAILQ_FOREACH(o, &tee_pobjs, link) { 67 if ((obj_id_len == o->obj_id_len) && 68 (memcmp(obj_id, o->obj_id, obj_id_len) == 0) && 69 (memcmp(uuid, &o->uuid, sizeof(TEE_UUID)) == 0)) { 70 *obj = o; 71 } 72 } 73 74 if (*obj) { 75 res = tee_pobj_check_access((*obj)->flags, flags); 76 if (res != TEE_SUCCESS) { 77 *obj = NULL; 78 return res; 79 } 80 81 (*obj)->refcnt++; 82 return TEE_SUCCESS; 83 } 84 85 /* new file */ 86 o = calloc(sizeof(struct tee_pobj), 1); 87 88 if (o == NULL) 89 return TEE_ERROR_OUT_OF_MEMORY; 90 91 o->refcnt = 1; 92 memcpy(&o->uuid, uuid, sizeof(TEE_UUID)); 93 o->flags = flags; 94 95 o->obj_id = malloc(obj_id_len); 96 if (o->obj_id == NULL) { 97 free(o); 98 return TEE_ERROR_OUT_OF_MEMORY; 99 } 100 memcpy(o->obj_id, obj_id, obj_id_len); 101 o->obj_id_len = obj_id_len; 102 103 TAILQ_INSERT_TAIL(&tee_pobjs, o, link); 104 *obj = o; 105 106 return TEE_SUCCESS; 107 } 108 109 TEE_Result tee_pobj_release(struct tee_pobj *obj) 110 { 111 if (obj == NULL) 112 return TEE_ERROR_BAD_PARAMETERS; 113 114 obj->refcnt--; 115 if (obj->refcnt == 0) { 116 TAILQ_REMOVE(&tee_pobjs, obj, link); 117 free(obj->obj_id); 118 free(obj); 119 } 120 121 return TEE_SUCCESS; 122 } 123 124 TEE_Result tee_pobj_rename(struct tee_pobj *obj, void *obj_id, 125 uint32_t obj_id_len) 126 { 127 TEE_Result res = TEE_SUCCESS; 128 void *new_obj_id = NULL; 129 130 if (obj == NULL || obj_id == NULL) 131 return TEE_ERROR_BAD_PARAMETERS; 132 133 if (obj->refcnt != 1) 134 return TEE_ERROR_BAD_STATE; 135 136 new_obj_id = malloc(obj_id_len); 137 if (new_obj_id == NULL) { 138 res = TEE_ERROR_OUT_OF_MEMORY; 139 goto exit; 140 } 141 memcpy(new_obj_id, obj_id, obj_id_len); 142 143 /* update internal data */ 144 free(obj->obj_id); 145 obj->obj_id = new_obj_id; 146 obj->obj_id_len = obj_id_len; 147 new_obj_id = NULL; 148 149 exit: 150 free(new_obj_id); 151 return res; 152 } 153 154 void tee_pobj_init(void) 155 { 156 TAILQ_INIT(&tee_pobjs); 157 } 158