xref: /openbmc/u-boot/lib/optee/optee.c (revision c916075f)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2017 Linaro
4  * Bryan O'Donoghue <bryan.odonoghue@linaro.org>
5  */
6 
7 #include <common.h>
8 #include <tee/optee.h>
9 
10 #define optee_hdr_err_msg \
11 	"OPTEE verification error:" \
12 	"\n\thdr=%p image=0x%08lx magic=0x%08x tzdram 0x%08lx-0x%08lx " \
13 	"\n\theader lo=0x%08x hi=0x%08x size=0x%08lx arch=0x%08x" \
14 	"\n\tuimage params 0x%08lx-0x%08lx\n"
15 
16 int optee_verify_image(struct optee_header *hdr, unsigned long tzdram_start,
17 		       unsigned long tzdram_len, unsigned long image_len)
18 {
19 	unsigned long tzdram_end = tzdram_start + tzdram_len;
20 	uint32_t tee_file_size;
21 
22 	tee_file_size = hdr->init_size + hdr->paged_size +
23 			sizeof(struct optee_header);
24 
25 	if (hdr->magic != OPTEE_MAGIC ||
26 	    hdr->version != OPTEE_VERSION ||
27 	    hdr->init_load_addr_hi > tzdram_end ||
28 	    hdr->init_load_addr_lo < tzdram_start ||
29 	    tee_file_size > tzdram_len ||
30 	    tee_file_size != image_len ||
31 	    (hdr->init_load_addr_lo + tee_file_size) > tzdram_end) {
32 		return -EINVAL;
33 	}
34 
35 	return 0;
36 }
37 
38 int optee_verify_bootm_image(unsigned long image_addr,
39 			     unsigned long image_load_addr,
40 			     unsigned long image_len)
41 {
42 	struct optee_header *hdr = (struct optee_header *)image_addr;
43 	unsigned long tzdram_start = CONFIG_OPTEE_TZDRAM_BASE;
44 	unsigned long tzdram_len = CONFIG_OPTEE_TZDRAM_SIZE;
45 
46 	int ret;
47 
48 	ret = optee_verify_image(hdr, tzdram_start, tzdram_len, image_len);
49 	if (ret)
50 		goto error;
51 
52 	if (image_load_addr + sizeof(*hdr) != hdr->init_load_addr_lo) {
53 		ret = -EINVAL;
54 		goto error;
55 	}
56 
57 	return ret;
58 error:
59 	printf(optee_hdr_err_msg, hdr, image_addr, hdr->magic, tzdram_start,
60 	       tzdram_start + tzdram_len, hdr->init_load_addr_lo,
61 	       hdr->init_load_addr_hi, image_len, hdr->arch, image_load_addr,
62 	       image_load_addr + image_len);
63 
64 	return ret;
65 }
66