1 /*
2 * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
3 * Copyright (c) 2019-2023, Intel Corporation. All rights reserved.
4 * Copyright (c) 2024, Altera Corporation. All rights reserved.
5 *
6 * SPDX-License-Identifier: BSD-3-Clause
7 */
8
9 #include <assert.h>
10 #include <errno.h>
11
12 #include "../lib/sha/sha.h"
13
14 #include <arch_helpers.h>
15 #include <common/bl_common.h>
16 #include <common/debug.h>
17 #include <common/desc_image_load.h>
18 #include <common/tbbr/tbbr_img_def.h>
19 #include <drivers/delay_timer.h>
20 #include <lib/mmio.h>
21 #include <lib/utils.h>
22 #include <plat/common/platform.h>
23 #include <tools_share/firmware_image_package.h>
24
25 #include "socfpga_mailbox.h"
26 #include "socfpga_vab.h"
27
get_img_size(uint8_t * img_buf,size_t img_buf_sz)28 size_t get_img_size(uint8_t *img_buf, size_t img_buf_sz)
29 {
30 uint8_t *img_buf_end = img_buf + img_buf_sz;
31 uint32_t cert_sz = get_unaligned_le32(img_buf_end - sizeof(uint32_t));
32 uint8_t *p = img_buf_end - cert_sz - sizeof(uint32_t);
33
34 /* Ensure p is pointing within the img_buf */
35 if (p < img_buf || p > (img_buf_end - VAB_CERT_HEADER_SIZE))
36 return 0;
37
38 if (get_unaligned_le32(p) == SDM_CERT_MAGIC_NUM)
39 return (size_t)(p - img_buf);
40
41 return 0;
42 }
43
socfpga_vab_init(unsigned int image_id)44 int socfpga_vab_init(unsigned int image_id)
45 {
46 int ret = 0;
47 size_t image_size;
48 void *image_base_ptr;
49 /*
50 * Get information about the images to load.
51 */
52 bl_mem_params_node_t *bl_mem_params = get_bl_mem_params_node(image_id);
53
54 assert(bl_mem_params);
55
56 if (bl_mem_params == NULL) {
57 ERROR("SOCFPGA VAB Init failed\n");
58 return -EINITREJECTED;
59 }
60
61 if ((image_id == BL31_IMAGE_ID) || (image_id == BL33_IMAGE_ID)) {
62 image_base_ptr = (void *)bl_mem_params->image_info.image_base;
63 image_size = bl_mem_params->image_info.image_size;
64 ret = socfpga_vab_authentication(&image_base_ptr, &image_size);
65 }
66
67 return ret;
68 }
69
socfpga_vab_authentication(void ** p_image,size_t * p_size)70 int socfpga_vab_authentication(void **p_image, size_t *p_size)
71 {
72 int retry_count = 20;
73 uint8_t hash384[FCS_SHA384_WORD_SIZE];
74 uint64_t img_addr, mbox_data_addr;
75 uint32_t img_sz, mbox_data_sz;
76 uint8_t *cert_hash_ptr, *mbox_relocate_data_addr;
77 uint32_t resp = 0, resp_len = 1;
78 int ret = 0;
79 uint8_t u8_buf_static[MBOX_DATA_MAX_LEN];
80
81 mbox_relocate_data_addr = u8_buf_static;
82
83 img_addr = (uintptr_t)*p_image;
84 img_sz = get_img_size((uint8_t *)img_addr, *p_size);
85
86 if (!img_sz) {
87 ERROR("VAB certificate not found in image!\n");
88 return -ENOVABCERT;
89 }
90
91 if (!IS_BYTE_ALIGNED(img_sz, sizeof(uint32_t))) {
92 ERROR("Image size (%d bytes) not aliged to 4 bytes!\n", img_sz);
93 return -EIMGERR;
94 }
95
96 /* Generate HASH384 from the image */
97 sha384_start((uint8_t *)img_addr, img_sz, hash384, CHUNKSZ_PER_WD_RESET);
98 cert_hash_ptr = (uint8_t *)(img_addr + img_sz + VAB_CERT_MAGIC_OFFSET +
99 VAB_CERT_FIT_SHA384_OFFSET);
100
101 /*
102 * Compare the SHA384 found in certificate against the SHA384
103 * calculated from image
104 */
105 if (memcmp(hash384, cert_hash_ptr, FCS_SHA384_WORD_SIZE)) {
106 ERROR("SHA384 does not match!\n");
107 return -EKEYREJECTED;
108 }
109
110 mbox_data_addr = img_addr + img_sz - sizeof(uint32_t);
111 /* Size in word (32bits) */
112 mbox_data_sz = (BYTE_ALIGN(*p_size - img_sz, sizeof(uint32_t))) >> 2;
113
114 VERBOSE("mbox_data_addr = %lx mbox_data_sz = %d\n", mbox_data_addr, mbox_data_sz);
115
116 memcpy_s(mbox_relocate_data_addr, mbox_data_sz * sizeof(uint32_t),
117 (uint8_t *)mbox_data_addr, mbox_data_sz * sizeof(uint32_t));
118
119 *((unsigned int *)mbox_relocate_data_addr) = CCERT_CMD_TEST_PGM_MASK;
120
121 do {
122 /* Invoke SMC call to ATF to send the VAB certificate to SDM */
123 ret = mailbox_send_cmd(MBOX_JOB_ID, MBOX_CMD_VAB_SRC_CERT,
124 (uint32_t *)mbox_relocate_data_addr, mbox_data_sz, 0, &resp, &resp_len);
125
126 /* If SDM is not available, just delay 50ms and retry again */
127 /* 0x1FF = The device is busy */
128 if (ret == MBOX_RESP_ERR(0x1FF)) {
129 mdelay(50);
130 } else {
131 break;
132 }
133 } while (--retry_count);
134
135 /* Free the relocate certificate memory space */
136 zeromem((void *)&mbox_relocate_data_addr, sizeof(uint32_t));
137
138 /* Exclude the size of the VAB certificate from image size */
139 *p_size = img_sz;
140
141 if (ret) {
142 /*
143 * Unsupported mailbox command or device not in the
144 * owned/secure state
145 */
146 /* 0x85 = Not allowed under current security setting */
147 if (ret == MBOX_RESP_ERR(0x85)) {
148 /* SDM bypass authentication */
149 ERROR("Image Authentication bypassed at address\n");
150 return 0;
151 }
152 ERROR("VAB certificate authentication failed in SDM\n");
153 /* 0x1FF = The device is busy */
154 if (ret == MBOX_RESP_ERR(0x1FF)) {
155 ERROR("Operation timed out\n");
156 return -ETIMEOUT;
157 } else if (ret == MBOX_WRONG_ID) {
158 ERROR("No such process\n");
159 return -EPROCESS;
160 }
161 return -EAUTH;
162 } else {
163 /* If Certificate Process Status has error */
164 if (resp) {
165 ERROR("VAB certificate execution format error\n");
166 return -EIMGERR;
167 }
168 }
169
170 NOTICE("%s 0x%lx (%d bytes)\n", "Image Authentication passed at address", img_addr, img_sz);
171 return ret;
172 }
173
get_unaligned_le32(const void * p)174 uint32_t get_unaligned_le32(const void *p)
175 {
176 return le32_to_cpue((uint32_t *)p);
177 }
178