1 // SPDX-License-Identifier: BSD-2-Clause 2 /* 3 * Copyright (c) 2014, STMicroelectronics International N.V. 4 */ 5 6 #include <kernel/mutex.h> 7 #include <stdlib.h> 8 #include <string.h> 9 #include <tee/tee_pobj.h> 10 #include <trace.h> 11 12 static TAILQ_HEAD(tee_pobjs, tee_pobj) tee_pobjs = 13 TAILQ_HEAD_INITIALIZER(tee_pobjs); 14 static struct mutex pobjs_mutex = MUTEX_INITIALIZER; 15 16 static TEE_Result tee_pobj_check_access(uint32_t oflags, uint32_t nflags) 17 { 18 /* meta is exclusive */ 19 if ((oflags & TEE_DATA_FLAG_ACCESS_WRITE_META) || 20 (nflags & TEE_DATA_FLAG_ACCESS_WRITE_META)) 21 return TEE_ERROR_ACCESS_CONFLICT; 22 23 /* 24 * Excerpt of TEE Internal Core API Specification v1.1: 25 * If more than one handle is opened on the same object, and if any 26 * of these object handles was opened with the flag 27 * TEE_DATA_FLAG_ACCESS_READ, then all the object handles MUST have been 28 * opened with the flag TEE_DATA_FLAG_SHARE_READ 29 */ 30 if (((oflags & TEE_DATA_FLAG_ACCESS_READ) || 31 (nflags & TEE_DATA_FLAG_ACCESS_READ)) && 32 !((nflags & TEE_DATA_FLAG_SHARE_READ) && 33 (oflags & TEE_DATA_FLAG_SHARE_READ))) 34 return TEE_ERROR_ACCESS_CONFLICT; 35 36 /* 37 * Excerpt of TEE Internal Core API Specification v1.1: 38 * An object can be opened with only share flags, which locks the access 39 * to an object against a given mode. 40 * An object can be opened with no flag set, which completely locks all 41 * subsequent attempts to access the object 42 */ 43 if ((nflags & TEE_DATA_FLAG_SHARE_READ) != 44 (oflags & TEE_DATA_FLAG_SHARE_READ)) 45 return TEE_ERROR_ACCESS_CONFLICT; 46 47 /* Same on WRITE access */ 48 if (((oflags & TEE_DATA_FLAG_ACCESS_WRITE) || 49 (nflags & 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 if ((nflags & TEE_DATA_FLAG_SHARE_WRITE) != 54 (oflags & TEE_DATA_FLAG_SHARE_WRITE)) 55 return TEE_ERROR_ACCESS_CONFLICT; 56 57 return TEE_SUCCESS; 58 } 59 60 TEE_Result tee_pobj_get(TEE_UUID *uuid, void *obj_id, uint32_t obj_id_len, 61 uint32_t flags, enum tee_pobj_usage usage, 62 const struct tee_file_operations *fops, 63 struct tee_pobj **obj) 64 { 65 bool temporary = (usage == TEE_POBJ_USAGE_CREATE); 66 TEE_Result res = TEE_SUCCESS; 67 struct tee_pobj *o = NULL; 68 69 *obj = NULL; 70 71 mutex_lock(&pobjs_mutex); 72 /* Check if file is open */ 73 TAILQ_FOREACH(o, &tee_pobjs, link) { 74 if ((obj_id_len == o->obj_id_len) && 75 (memcmp(obj_id, o->obj_id, obj_id_len) == 0) && 76 (memcmp(uuid, &o->uuid, sizeof(TEE_UUID)) == 0) && 77 (fops == o->fops)) { 78 *obj = o; 79 } 80 } 81 82 if (*obj) { 83 if (usage == TEE_POBJ_USAGE_ENUM) { 84 (*obj)->refcnt++; 85 goto out; 86 } 87 if (temporary != (*obj)->temporary) { 88 res = TEE_ERROR_ACCESS_CONFLICT; 89 goto out; 90 } 91 res = tee_pobj_check_access((*obj)->flags, flags); 92 if (res == TEE_SUCCESS) 93 (*obj)->refcnt++; 94 goto out; 95 } 96 97 /* new file */ 98 o = calloc(1, sizeof(struct tee_pobj)); 99 if (!o) { 100 res = TEE_ERROR_OUT_OF_MEMORY; 101 goto out; 102 } 103 104 o->refcnt = 1; 105 memcpy(&o->uuid, uuid, sizeof(TEE_UUID)); 106 o->flags = flags; 107 o->fops = fops; 108 o->temporary = temporary; 109 110 o->obj_id = malloc(obj_id_len); 111 if (o->obj_id == NULL) { 112 free(o); 113 res = TEE_ERROR_OUT_OF_MEMORY; 114 goto out; 115 } 116 memcpy(o->obj_id, obj_id, obj_id_len); 117 o->obj_id_len = obj_id_len; 118 119 TAILQ_INSERT_TAIL(&tee_pobjs, o, link); 120 *obj = o; 121 122 res = TEE_SUCCESS; 123 out: 124 if (res != TEE_SUCCESS) 125 *obj = NULL; 126 mutex_unlock(&pobjs_mutex); 127 return res; 128 } 129 130 TEE_Result tee_pobj_release(struct tee_pobj *obj) 131 { 132 if (obj == NULL) 133 return TEE_ERROR_BAD_PARAMETERS; 134 135 mutex_lock(&pobjs_mutex); 136 obj->refcnt--; 137 if (obj->refcnt == 0) { 138 TAILQ_REMOVE(&tee_pobjs, obj, link); 139 free(obj->obj_id); 140 free(obj); 141 } 142 mutex_unlock(&pobjs_mutex); 143 144 return TEE_SUCCESS; 145 } 146 147 TEE_Result tee_pobj_rename(struct tee_pobj *obj, void *obj_id, 148 uint32_t obj_id_len) 149 { 150 TEE_Result res = TEE_SUCCESS; 151 void *new_obj_id = NULL; 152 153 if (obj == NULL || obj_id == NULL) 154 return TEE_ERROR_BAD_PARAMETERS; 155 156 mutex_lock(&pobjs_mutex); 157 if (obj->refcnt != 1) { 158 res = TEE_ERROR_BAD_STATE; 159 goto exit; 160 } 161 162 new_obj_id = malloc(obj_id_len); 163 if (new_obj_id == NULL) { 164 res = TEE_ERROR_OUT_OF_MEMORY; 165 goto exit; 166 } 167 memcpy(new_obj_id, obj_id, obj_id_len); 168 169 /* update internal data */ 170 free(obj->obj_id); 171 obj->obj_id = new_obj_id; 172 obj->obj_id_len = obj_id_len; 173 new_obj_id = NULL; 174 175 exit: 176 mutex_unlock(&pobjs_mutex); 177 free(new_obj_id); 178 return res; 179 } 180