mtk-lk/platform/common/boot/legacy/dm_verity.c

/* Copyright Statement:
 *
 * This software/firmware and related documentation ("MediaTek Software") are
 * protected under relevant copyright laws. The information contained herein
 * is confidential and proprietary to MediaTek Inc. and/or its licensors.
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 */
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 *
 * BY OPENING THIS FILE, RECEIVER HEREBY UNEQUIVOCALLY ACKNOWLEDGES AND AGREES
 * THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")
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 */

#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <sys/types.h>
#include <video.h>
#include <verified_boot_common.h>
#include <dm_verity_status.h>

#include <platform/mt_typedefs.h>
#include <platform/mt_reg_base.h>
#include <platform/mtk_wdt.h>
#include <platform/mt_gpt.h>
#include <platform/vboot_keypad.h>
#include <pal_log.h>
#include <bootargs.h>
#include <recovery.h>

#define DM_VERITY_ERROR_WAIT_TIME (30000)

unsigned int g_verity_mode = VERITY_MODE_RESTART;

static void show_dm_verity_error(void)
{
	const char *title_msg = "dm-verity error\n\n";
	unsigned int wait_time = 0;

	video_clean_screen();
	video_set_cursor(video_get_rows() / 2, 0);
	video_printf(title_msg);
	video_printf("Android system on your device is corrupted.\n");
	video_printf("Please confirm whether you want to boot in\n");
	video_printf("EIO mode or RESTART mode. System will boot with\n");
	video_printf("RESTART mode automatically after 30 seconds\n");
	video_printf("(Volume UP)   : EIO mode.\n\n");
	video_printf("(Volume Down) : RESTART mode.\n\n");

	while (wait_time < DM_VERITY_ERROR_WAIT_TIME) {
		mtk_wdt_restart();
		if (mtk_detect_key(VBOOT_KEYPAD_VOL_UP)) {
			g_verity_mode = VERITY_MODE_EIO;
			break;
		} else if (mtk_detect_key(VBOOT_KEYPAD_VOL_DOWN)) {
			g_verity_mode = VERITY_MODE_RESTART;
			break;
		} else {
			/* ignore */
		}
		mdelay(100);
		wait_time += 100;
	}

	return;
}

void dm_verity_handler(uint32_t hashtree_error_mode)
{
	uint32_t status = 0;
	BOOL ota_result = FALSE;

	PAL_UNUSED_PARAM(hashtree_error_mode);

	get_dm_verity_status(&status);

	ota_result = check_ota_result();
	if (ota_result == TRUE) {
		pal_log_info("first boot after OTA.\n");
		clear_dm_verity_status();
		ota_result = clear_ota_result();
		if (ota_result != TRUE)
			pal_log_err("fail to clear ota result.\n");
		status = 0;
	}

	if (status) {
		show_dm_verity_error();
		if (g_verity_mode == VERITY_MODE_RESTART)
			cmdline_append("androidboot.veritymode=enforcing");
		else if (g_verity_mode == VERITY_MODE_EIO)
			cmdline_append("androidboot.veritymode=eio");
		else
			cmdline_append("androidboot.veritymode=enforcing");
		/* we don't clear dm-verity error currently */
	} else
		cmdline_append("androidboot.veritymode=enforcing");

	return;
}