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/* Copyright 2016 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "byteorder.h"
#include "console.h"
#include "extension.h"
#include "flash.h"
#include "hooks.h"
#include "include/compile_time_macros.h"
#include "rollback.h"
#include "rwsig.h"
#include "sha256.h"
#include "system.h"
#include "uart.h"
#include "update_fw.h"
#include "util.h"
#include "vb21_struct.h"
#define CPRINTF(format, args...) cprintf(CC_USB, format, ## args)
/* Section to be updated (i.e. not the current section). */
struct {
uint32_t base_offset;
uint32_t top_offset;
} update_section;
#ifdef CONFIG_TOUCHPAD_VIRTUAL_OFF
/*
* Check if a block is within touchpad FW virtual address region, and
* is therefore meant to be flashed to the touchpad.
*/
static int is_touchpad_block(uint32_t block_offset, size_t body_size)
{
return (block_offset >= CONFIG_TOUCHPAD_VIRTUAL_OFF) &&
(block_offset + body_size) <=
(CONFIG_TOUCHPAD_VIRTUAL_OFF +
CONFIG_TOUCHPAD_VIRTUAL_SIZE);
}
#endif
/*
* Verify that the passed in block fits into the valid area. If it does, and
* is destined to the base address of the area - erase the area contents.
*
* Return success, or indication of an erase failure or chunk not fitting into
* valid area.
*
* TODO(b/36375666): Each board/chip should be able to re-define this.
*/
static uint8_t check_update_chunk(uint32_t block_offset, size_t body_size)
{
uint32_t base;
uint32_t size;
/* Is this an RW chunk? */
if (update_section.base_offset != update_section.top_offset &&
(block_offset >= update_section.base_offset) &&
((block_offset + body_size) <= update_section.top_offset)) {
base = update_section.base_offset;
size = update_section.top_offset -
update_section.base_offset;
/*
* If this is the first chunk for this section, it needs to
* be erased.
*/
if (block_offset == base) {
if (flash_physical_erase(base, size) != EC_SUCCESS) {
CPRINTF("%s:%d erase failure of 0x%x..+0x%x\n",
__func__, __LINE__, base, size);
return UPDATE_ERASE_FAILURE;
}
}
return UPDATE_SUCCESS;
}
#ifdef CONFIG_TOUCHPAD_VIRTUAL_OFF
if (is_touchpad_block(block_offset, body_size))
return UPDATE_SUCCESS;
#endif
CPRINTF("%s:%d %x, %d section base %x top %x\n",
__func__, __LINE__,
block_offset, body_size,
update_section.base_offset,
update_section.top_offset);
return UPDATE_BAD_ADDR;
}
/* TODO(b/36375666): These need to be overridden for chip/g. */
int update_pdu_valid(struct update_command *cmd_body, size_t cmd_size)
{
return 1;
}
static int chunk_came_too_soon(uint32_t block_offset)
{
return 0;
}
static void new_chunk_written(uint32_t block_offset)
{
}
static int contents_allowed(uint32_t block_offset,
size_t body_size, void *update_data)
{
#ifdef CONFIG_TOUCHPAD_VIRTUAL_OFF
if (is_touchpad_block(block_offset, body_size)) {
struct sha256_ctx ctx;
uint8_t *tmp;
SHA256_init(&ctx);
SHA256_update(&ctx, update_data, body_size);
tmp = SHA256_final(&ctx);
/* TODO(b:63993173): Actually validate the SHA. */
CPRINTF("%s: SHA %08x %02x..%02x\n", __func__,
block_offset - CONFIG_TOUCHPAD_VIRTUAL_OFF,
tmp[0], tmp[31]);
return 1;
}
#endif
return 1;
}
/*
* Setup internal state (e.g. valid sections, and fill first response).
*
* Assumes rpdu is already prefilled with 0, and that version has already
* been set. May set a return_value != 0 on error.
*/
void fw_update_start(struct first_response_pdu *rpdu)
{
const char *version;
#ifdef CONFIG_RWSIG_TYPE_RWSIG
const struct vb21_packed_key *vb21_key;
#endif
rpdu->header_type = htobe16(UPDATE_HEADER_TYPE_COMMON);
/* Determine the valid update section. */
switch (system_get_image_copy()) {
case SYSTEM_IMAGE_RO:
/* RO running, so update RW */
update_section.base_offset = CONFIG_RW_MEM_OFF;
update_section.top_offset = CONFIG_RW_MEM_OFF + CONFIG_RW_SIZE;
version = system_get_version(SYSTEM_IMAGE_RW);
break;
case SYSTEM_IMAGE_RW:
/* RW running, so update RO */
update_section.base_offset = CONFIG_RO_MEM_OFF;
update_section.top_offset = CONFIG_RO_MEM_OFF + CONFIG_RO_SIZE;
version = system_get_version(SYSTEM_IMAGE_RO);
break;
default:
CPRINTF("%s:%d\n", __func__, __LINE__);
rpdu->return_value = htobe32(UPDATE_GEN_ERROR);
return;
}
rpdu->common.maximum_pdu_size = htobe32(CONFIG_UPDATE_PDU_SIZE);
rpdu->common.flash_protection = htobe32(flash_get_protect());
rpdu->common.offset = htobe32(update_section.base_offset);
if (version)
memcpy(rpdu->common.version, version,
sizeof(rpdu->common.version));
#ifdef CONFIG_ROLLBACK
rpdu->common.min_rollback = htobe32(rollback_get_minimum_version());
#else
rpdu->common.min_rollback = htobe32(-1);
#endif
#ifdef CONFIG_RWSIG_TYPE_RWSIG
vb21_key = (const struct vb21_packed_key *)CONFIG_RO_PUBKEY_ADDR;
rpdu->common.key_version = htobe32(vb21_key->key_version);
#endif
#ifdef HAS_TASK_RWSIG
/* Do not allow the update to start if RWSIG is still running. */
if (rwsig_get_status() == RWSIG_IN_PROGRESS) {
CPRINTF("RWSIG in progress\n");
rpdu->return_value = htobe32(UPDATE_RWSIG_BUSY);
}
#endif
}
void fw_update_command_handler(void *body,
size_t cmd_size,
size_t *response_size)
{
struct update_command *cmd_body = body;
void *update_data;
uint8_t *error_code = body; /* Cache the address for code clarity. */
size_t body_size;
uint32_t block_offset;
*response_size = 1; /* One byte response unless this is a start PDU. */
if (cmd_size < sizeof(struct update_command)) {
CPRINTF("%s:%d\n", __func__, __LINE__);
*error_code = UPDATE_GEN_ERROR;
return;
}
body_size = cmd_size - sizeof(struct update_command);
if (!cmd_body->block_base && !body_size) {
struct first_response_pdu *rpdu = body;
/*
* This is the connection establishment request, the response
* allows the server to decide what sections of the image to
* send to program into the flash.
*/
/* First, prepare the response structure. */
memset(rpdu, 0, sizeof(*rpdu));
/*
* TODO(b/36375666): The response size can be shorter depending
* on which board-specific type of response we provide. This
* may send trailing 0 bytes, which should be harmless.
*/
*response_size = sizeof(*rpdu);
rpdu->protocol_version = htobe16(UPDATE_PROTOCOL_VERSION);
/* Setup internal state (e.g. valid sections, and fill rpdu) */
fw_update_start(rpdu);
return;
}
block_offset = be32toh(cmd_body->block_base);
if (!update_pdu_valid(cmd_body, cmd_size)) {
*error_code = UPDATE_DATA_ERROR;
return;
}
update_data = cmd_body + 1;
if (!contents_allowed(block_offset, body_size, update_data)) {
*error_code = UPDATE_ROLLBACK_ERROR;
return;
}
/* Check if the block will fit into the valid area. */
*error_code = check_update_chunk(block_offset, body_size);
if (*error_code)
return;
if (chunk_came_too_soon(block_offset)) {
*error_code = UPDATE_RATE_LIMIT_ERROR;
return;
}
/*
* TODO(b/36375666): chip/g code has some cr50-specific stuff right
* here, which should probably be merged into contents_allowed...
*/
#ifdef CONFIG_TOUCHPAD_VIRTUAL_OFF
if (is_touchpad_block(block_offset, body_size)) {
if (touchpad_update_write(
block_offset - CONFIG_TOUCHPAD_VIRTUAL_OFF,
body_size, update_data) != EC_SUCCESS) {
*error_code = UPDATE_WRITE_FAILURE;
CPRINTF("%s:%d update write error\n",
__func__, __LINE__);
return;
}
new_chunk_written(block_offset);
*error_code = UPDATE_SUCCESS;
return;
}
#endif
CPRINTF("update: 0x%x\n", block_offset + CONFIG_PROGRAM_MEMORY_BASE);
if (flash_physical_write(block_offset, body_size, update_data)
!= EC_SUCCESS) {
*error_code = UPDATE_WRITE_FAILURE;
CPRINTF("%s:%d update write error\n", __func__, __LINE__);
return;
}
new_chunk_written(block_offset);
/* Verify that data was written properly. */
if (memcmp(update_data, (void *)
(block_offset + CONFIG_PROGRAM_MEMORY_BASE),
body_size)) {
*error_code = UPDATE_VERIFY_ERROR;
CPRINTF("%s:%d update verification error\n",
__func__, __LINE__);
return;
}
*error_code = UPDATE_SUCCESS;
}
/* TODO(b/36375666): This need to be overridden for chip/g. */
void fw_update_complete(void)
{
}
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