mirror of
https://github.com/AsahiLinux/u-boot
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a94a4071d4
Replace instances of http://www.ti.com with https://www.ti.com Signed-off-by: Nishanth Menon <nm@ti.com>
133 lines
3.7 KiB
C
133 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* K3: Security functions
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*
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* Copyright (C) 2018-2022 Texas Instruments Incorporated - https://www.ti.com/
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* Andrew F. Davis <afd@ti.com>
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*/
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#include <asm/io.h>
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#include <common.h>
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#include <cpu_func.h>
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#include <dm.h>
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#include <hang.h>
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#include <image.h>
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#include <log.h>
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#include <asm/cache.h>
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#include <linux/soc/ti/ti_sci_protocol.h>
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#include <mach/spl.h>
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#include <spl.h>
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#include <linux/dma-mapping.h>
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#include "common.h"
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static bool ti_secure_cert_detected(void *p_image)
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{
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/* Primitive certificate detection, check for DER starting with
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* two 4-Octet SEQUENCE tags
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*/
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return (((u8 *)p_image)[0] == 0x30 && ((u8 *)p_image)[1] == 0x82 &&
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((u8 *)p_image)[4] == 0x30 && ((u8 *)p_image)[5] == 0x82);
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}
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/* Primitive certificate length, assumes one 2-Octet sized SEQUENCE */
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static size_t ti_secure_cert_length(void *p_image)
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{
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size_t seq_length = be16_to_cpu(readw_relaxed(p_image + 2));
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/* Add 4 for the SEQUENCE tag length */
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return seq_length + 4;
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}
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void ti_secure_image_check_binary(void **p_image, size_t *p_size)
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{
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u32 image_size;
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size_t cert_length;
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image_size = *p_size;
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if (!image_size) {
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debug("%s: Image size is %d\n", __func__, image_size);
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return;
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}
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if (get_device_type() == K3_DEVICE_TYPE_GP) {
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if (ti_secure_cert_detected(*p_image)) {
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printf("Warning: Detected image signing certificate on GP device. "
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"Skipping certificate to prevent boot failure. "
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"This will fail if the image was also encrypted\n");
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cert_length = ti_secure_cert_length(*p_image);
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if (cert_length > *p_size) {
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printf("Invalid signing certificate size\n");
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return;
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}
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*p_image += cert_length;
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*p_size -= cert_length;
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}
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return;
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}
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}
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void ti_secure_image_post_process(void **p_image, size_t *p_size)
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{
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struct ti_sci_handle *ti_sci = get_ti_sci_handle();
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struct ti_sci_proc_ops *proc_ops = &ti_sci->ops.proc_ops;
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u64 image_addr;
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u32 image_size;
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int ret;
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image_size = *p_size;
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if (!image_size) {
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debug("%s: Image size is %d\n", __func__, image_size);
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return;
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}
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if (get_device_type() == K3_DEVICE_TYPE_GP)
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return;
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if (get_device_type() != K3_DEVICE_TYPE_HS_SE &&
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!ti_secure_cert_detected(*p_image)) {
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printf("Warning: Did not detect image signing certificate. "
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"Skipping authentication to prevent boot failure. "
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"This will fail on Security Enforcing(HS-SE) devices\n");
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return;
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}
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/* Clean out image so it can be seen by system firmware */
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image_addr = dma_map_single(*p_image, *p_size, DMA_BIDIRECTIONAL);
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debug("Authenticating image at address 0x%016llx\n", image_addr);
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debug("Authenticating image of size %d bytes\n", image_size);
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/* Authenticate image */
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ret = proc_ops->proc_auth_boot_image(ti_sci, &image_addr, &image_size);
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if (ret) {
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printf("Authentication failed!\n");
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hang();
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}
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/* Invalidate any stale lines over data written by system firmware */
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if (image_size)
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dma_unmap_single(image_addr, image_size, DMA_BIDIRECTIONAL);
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/*
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* The image_size returned may be 0 when the authentication process has
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* moved the image. When this happens no further processing on the
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* image is needed or often even possible as it may have also been
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* placed behind a firewall when moved.
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*/
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*p_size = image_size;
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/*
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* Output notification of successful authentication to re-assure the
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* user that the secure code is being processed as expected. However
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* suppress any such log output in case of building for SPL and booting
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* via YMODEM. This is done to avoid disturbing the YMODEM serial
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* protocol transactions.
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*/
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if (!(IS_ENABLED(CONFIG_SPL_BUILD) &&
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IS_ENABLED(CONFIG_SPL_YMODEM_SUPPORT) &&
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spl_boot_device() == BOOT_DEVICE_UART))
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printf("Authentication passed\n");
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}
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