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 30 #include <string.h> 31 #include <stdlib.h> 32 33 static TAILQ_HEAD(tee_pobjs, tee_pobj) tee_pobjs = 34 TAILQ_HEAD_INITIALIZER(tee_pobjs); 35 36 static TEE_Result tee_pobj_check_access(uint32_t oflags, uint32_t nflags) 37 { 38 /* meta is exclusive */ 39 if (oflags | TEE_DATA_FLAG_ACCESS_WRITE_META || 40 nflags | TEE_DATA_FLAG_ACCESS_WRITE_META) 41 return TEE_ERROR_ACCESS_CONFLICT; 42 43 if (oflags | TEE_DATA_FLAG_ACCESS_READ && 44 !((nflags | TEE_DATA_FLAG_SHARE_READ) && 45 oflags | TEE_DATA_FLAG_SHARE_READ)) 46 return TEE_ERROR_ACCESS_CONFLICT; 47 48 if (oflags | TEE_DATA_FLAG_ACCESS_WRITE && 49 !((nflags | TEE_DATA_FLAG_SHARE_WRITE) && 50 oflags | TEE_DATA_FLAG_SHARE_WRITE)) 51 return TEE_ERROR_ACCESS_CONFLICT; 52 53 return TEE_SUCCESS; 54 } 55 56 TEE_Result tee_pobj_get(TEE_UUID *uuid, void *obj_id, uint32_t obj_id_len, 57 uint32_t flags, struct tee_pobj **obj) 58 { 59 struct tee_pobj *o; 60 TEE_Result res; 61 62 *obj = NULL; 63 64 /* Check if file is open */ 65 TAILQ_FOREACH(o, &tee_pobjs, link) { 66 if ((obj_id_len == o->obj_id_len) && 67 (memcmp(obj_id, o->obj_id, obj_id_len) == 0) && 68 (memcmp(uuid, &o->uuid, sizeof(TEE_UUID)) == 0)) { 69 *obj = o; 70 } 71 } 72 73 if (*obj) { 74 res = tee_pobj_check_access((*obj)->flags, flags); 75 if (res != TEE_SUCCESS) { 76 *obj = NULL; 77 return res; 78 } 79 80 (*obj)->refcnt++; 81 return TEE_SUCCESS; 82 } 83 84 /* new file */ 85 o = calloc(sizeof(struct tee_pobj), 1); 86 87 if (o == NULL) 88 return TEE_ERROR_OUT_OF_MEMORY; 89 90 o->refcnt = 1; 91 memcpy(&o->uuid, uuid, sizeof(TEE_UUID)); 92 o->flags = flags; 93 94 o->obj_id = malloc(obj_id_len); 95 if (o->obj_id == NULL) { 96 free(o); 97 return TEE_ERROR_OUT_OF_MEMORY; 98 } 99 memcpy(o->obj_id, obj_id, obj_id_len); 100 o->obj_id_len = obj_id_len; 101 102 TAILQ_INSERT_TAIL(&tee_pobjs, o, link); 103 *obj = o; 104 105 return TEE_SUCCESS; 106 } 107 108 TEE_Result tee_pobj_release(struct tee_pobj *obj) 109 { 110 if (obj == NULL) 111 return TEE_ERROR_BAD_PARAMETERS; 112 113 obj->refcnt--; 114 if (obj->refcnt == 0) { 115 TAILQ_REMOVE(&tee_pobjs, obj, link); 116 free(obj->obj_id); 117 free(obj); 118 } 119 120 return TEE_SUCCESS; 121 } 122 123 TEE_Result tee_pobj_rename(struct tee_pobj *obj, void *obj_id, 124 uint32_t obj_id_len) 125 { 126 TEE_Result res = TEE_SUCCESS; 127 void *new_obj_id = NULL; 128 129 if (obj == NULL || obj_id == NULL) 130 return TEE_ERROR_BAD_PARAMETERS; 131 132 if (obj->refcnt != 1) 133 return TEE_ERROR_BAD_STATE; 134 135 new_obj_id = malloc(obj_id_len); 136 if (new_obj_id == NULL) { 137 res = TEE_ERROR_OUT_OF_MEMORY; 138 goto exit; 139 } 140 memcpy(new_obj_id, obj_id, obj_id_len); 141 142 /* update internal data */ 143 free(obj->obj_id); 144 obj->obj_id = new_obj_id; 145 obj->obj_id_len = obj_id_len; 146 new_obj_id = NULL; 147 148 exit: 149 free(new_obj_id); 150 return res; 151 } 152 153 void tee_pobj_init(void) 154 { 155 TAILQ_INIT(&tee_pobjs); 156 } 157