From af1a266670d040d2f4083ff309d732d648afba2a Mon Sep 17 00:00:00 2001
From: Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com>
Date: Tue, 10 Oct 2023 14:33:42 +0000
Subject: Add submodule dependency files
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
---
roms/u-boot/common/autoboot.c | 397 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 397 insertions(+)
create mode 100644 roms/u-boot/common/autoboot.c
(limited to 'roms/u-boot/common/autoboot.c')
diff --git a/roms/u-boot/common/autoboot.c b/roms/u-boot/common/autoboot.c
new file mode 100644
index 000000000..b42148c72
--- /dev/null
+++ b/roms/u-boot/common/autoboot.c
@@ -0,0 +1,397 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ */
+
+#include <common.h>
+#include <autoboot.h>
+#include <bootretry.h>
+#include <cli.h>
+#include <command.h>
+#include <console.h>
+#include <env.h>
+#include <fdtdec.h>
+#include <hash.h>
+#include <log.h>
+#include <malloc.h>
+#include <memalign.h>
+#include <menu.h>
+#include <post.h>
+#include <time.h>
+#include <asm/global_data.h>
+#include <linux/delay.h>
+#include <u-boot/sha256.h>
+#include <bootcount.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define MAX_DELAY_STOP_STR 64
+
+#ifndef DEBUG_BOOTKEYS
+#define DEBUG_BOOTKEYS 0
+#endif
+#define debug_bootkeys(fmt, args...) \
+ debug_cond(DEBUG_BOOTKEYS, fmt, ##args)
+
+/* Stored value of bootdelay, used by autoboot_command() */
+static int stored_bootdelay;
+static int menukey;
+
+#ifdef CONFIG_AUTOBOOT_ENCRYPTION
+#define AUTOBOOT_STOP_STR_SHA256 CONFIG_AUTOBOOT_STOP_STR_SHA256
+#else
+#define AUTOBOOT_STOP_STR_SHA256 ""
+#endif
+
+#ifdef CONFIG_AUTOBOOT_USE_MENUKEY
+#define AUTOBOOT_MENUKEY CONFIG_AUTOBOOT_MENUKEY
+#else
+#define AUTOBOOT_MENUKEY 0
+#endif
+
+/*
+ * Use a "constant-length" time compare function for this
+ * hash compare:
+ *
+ * https://crackstation.net/hashing-security.htm
+ */
+static int slow_equals(u8 *a, u8 *b, int len)
+{
+ int diff = 0;
+ int i;
+
+ for (i = 0; i < len; i++)
+ diff |= a[i] ^ b[i];
+
+ return diff == 0;
+}
+
+/**
+ * passwd_abort_sha256() - check for a hashed key sequence to abort booting
+ *
+ * This checks for the user entering a SHA256 hash within a given time.
+ *
+ * @etime: Timeout value ticks (stop when get_ticks() reachs this)
+ * @return 0 if autoboot should continue, 1 if it should stop
+ */
+static int passwd_abort_sha256(uint64_t etime)
+{
+ const char *sha_env_str = env_get("bootstopkeysha256");
+ u8 sha_env[SHA256_SUM_LEN];
+ u8 *sha;
+ char *presskey;
+ char *c;
+ const char *algo_name = "sha256";
+ u_int presskey_len = 0;
+ int abort = 0;
+ int size = sizeof(sha);
+ int ret;
+
+ if (sha_env_str == NULL)
+ sha_env_str = AUTOBOOT_STOP_STR_SHA256;
+
+ presskey = malloc_cache_aligned(MAX_DELAY_STOP_STR);
+ c = strstr(sha_env_str, ":");
+ if (c && (c - sha_env_str < MAX_DELAY_STOP_STR)) {
+ /* preload presskey with salt */
+ memcpy(presskey, sha_env_str, c - sha_env_str);
+ presskey_len = c - sha_env_str;
+ sha_env_str = c + 1;
+ }
+ /*
+ * Generate the binary value from the environment hash value
+ * so that we can compare this value with the computed hash
+ * from the user input
+ */
+ ret = hash_parse_string(algo_name, sha_env_str, sha_env);
+ if (ret) {
+ printf("Hash %s not supported!\n", algo_name);
+ return 0;
+ }
+
+ sha = malloc_cache_aligned(SHA256_SUM_LEN);
+ size = SHA256_SUM_LEN;
+ /*
+ * We don't know how long the stop-string is, so we need to
+ * generate the sha256 hash upon each input character and
+ * compare the value with the one saved in the environment
+ */
+ do {
+ if (tstc()) {
+ /* Check for input string overflow */
+ if (presskey_len >= MAX_DELAY_STOP_STR) {
+ free(presskey);
+ free(sha);
+ return 0;
+ }
+
+ presskey[presskey_len++] = getchar();
+
+ /* Calculate sha256 upon each new char */
+ hash_block(algo_name, (const void *)presskey,
+ presskey_len, sha, &size);
+
+ /* And check if sha matches saved value in env */
+ if (slow_equals(sha, sha_env, SHA256_SUM_LEN))
+ abort = 1;
+ }
+ } while (!abort && get_ticks() <= etime);
+
+ free(presskey);
+ free(sha);
+ return abort;
+}
+
+/**
+ * passwd_abort_key() - check for a key sequence to aborted booting
+ *
+ * This checks for the user entering a string within a given time.
+ *
+ * @etime: Timeout value ticks (stop when get_ticks() reachs this)
+ * @return 0 if autoboot should continue, 1 if it should stop
+ */
+static int passwd_abort_key(uint64_t etime)
+{
+ int abort = 0;
+ struct {
+ char *str;
+ u_int len;
+ int retry;
+ }
+ delaykey[] = {
+ { .str = env_get("bootdelaykey"), .retry = 1 },
+ { .str = env_get("bootstopkey"), .retry = 0 },
+ };
+
+ char presskey[MAX_DELAY_STOP_STR];
+ int presskey_len = 0;
+ int presskey_max = 0;
+ int i;
+
+# ifdef CONFIG_AUTOBOOT_DELAY_STR
+ if (delaykey[0].str == NULL)
+ delaykey[0].str = CONFIG_AUTOBOOT_DELAY_STR;
+# endif
+# ifdef CONFIG_AUTOBOOT_STOP_STR
+ if (delaykey[1].str == NULL)
+ delaykey[1].str = CONFIG_AUTOBOOT_STOP_STR;
+# endif
+
+ for (i = 0; i < sizeof(delaykey) / sizeof(delaykey[0]); i++) {
+ delaykey[i].len = delaykey[i].str == NULL ?
+ 0 : strlen(delaykey[i].str);
+ delaykey[i].len = delaykey[i].len > MAX_DELAY_STOP_STR ?
+ MAX_DELAY_STOP_STR : delaykey[i].len;
+
+ presskey_max = presskey_max > delaykey[i].len ?
+ presskey_max : delaykey[i].len;
+
+ debug_bootkeys("%s key:<%s>\n",
+ delaykey[i].retry ? "delay" : "stop",
+ delaykey[i].str ? delaykey[i].str : "NULL");
+ }
+
+ /* In order to keep up with incoming data, check timeout only
+ * when catch up.
+ */
+ do {
+ if (tstc()) {
+ if (presskey_len < presskey_max) {
+ presskey[presskey_len++] = getchar();
+ } else {
+ for (i = 0; i < presskey_max - 1; i++)
+ presskey[i] = presskey[i + 1];
+
+ presskey[i] = getchar();
+ }
+ }
+
+ for (i = 0; i < sizeof(delaykey) / sizeof(delaykey[0]); i++) {
+ if (delaykey[i].len > 0 &&
+ presskey_len >= delaykey[i].len &&
+ memcmp(presskey + presskey_len -
+ delaykey[i].len, delaykey[i].str,
+ delaykey[i].len) == 0) {
+ debug_bootkeys("got %skey\n",
+ delaykey[i].retry ? "delay" :
+ "stop");
+
+ /* don't retry auto boot */
+ if (!delaykey[i].retry)
+ bootretry_dont_retry();
+ abort = 1;
+ }
+ }
+ } while (!abort && get_ticks() <= etime);
+
+ return abort;
+}
+
+/***************************************************************************
+ * Watch for 'delay' seconds for autoboot stop or autoboot delay string.
+ * returns: 0 - no key string, allow autoboot 1 - got key string, abort
+ */
+static int abortboot_key_sequence(int bootdelay)
+{
+ int abort;
+ uint64_t etime = endtick(bootdelay);
+
+# ifdef CONFIG_AUTOBOOT_PROMPT
+ /*
+ * CONFIG_AUTOBOOT_PROMPT includes the %d for all boards.
+ * To print the bootdelay value upon bootup.
+ */
+ printf(CONFIG_AUTOBOOT_PROMPT, bootdelay);
+# endif
+
+ if (IS_ENABLED(CONFIG_AUTOBOOT_ENCRYPTION))
+ abort = passwd_abort_sha256(etime);
+ else
+ abort = passwd_abort_key(etime);
+ if (!abort)
+ debug_bootkeys("key timeout\n");
+
+ return abort;
+}
+
+static int abortboot_single_key(int bootdelay)
+{
+ int abort = 0;
+ unsigned long ts;
+
+ printf("Hit any key to stop autoboot: %2d ", bootdelay);
+
+ /*
+ * Check if key already pressed
+ */
+ if (tstc()) { /* we got a key press */
+ getchar(); /* consume input */
+ puts("\b\b\b 0");
+ abort = 1; /* don't auto boot */
+ }
+
+ while ((bootdelay > 0) && (!abort)) {
+ --bootdelay;
+ /* delay 1000 ms */
+ ts = get_timer(0);
+ do {
+ if (tstc()) { /* we got a key press */
+ int key;
+
+ abort = 1; /* don't auto boot */
+ bootdelay = 0; /* no more delay */
+ key = getchar();/* consume input */
+ if (IS_ENABLED(CONFIG_AUTOBOOT_USE_MENUKEY))
+ menukey = key;
+ break;
+ }
+ udelay(10000);
+ } while (!abort && get_timer(ts) < 1000);
+
+ printf("\b\b\b%2d ", bootdelay);
+ }
+
+ putc('\n');
+
+ return abort;
+}
+
+static int abortboot(int bootdelay)
+{
+ int abort = 0;
+
+ if (bootdelay >= 0) {
+ if (IS_ENABLED(CONFIG_AUTOBOOT_KEYED))
+ abort = abortboot_key_sequence(bootdelay);
+ else
+ abort = abortboot_single_key(bootdelay);
+ }
+
+ if (IS_ENABLED(CONFIG_SILENT_CONSOLE) && abort)
+ gd->flags &= ~GD_FLG_SILENT;
+
+ return abort;
+}
+
+static void process_fdt_options(const void *blob)
+{
+#ifdef CONFIG_SYS_TEXT_BASE
+ ulong addr;
+
+ /* Add an env variable to point to a kernel payload, if available */
+ addr = fdtdec_get_config_int(gd->fdt_blob, "kernel-offset", 0);
+ if (addr)
+ env_set_addr("kernaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
+
+ /* Add an env variable to point to a root disk, if available */
+ addr = fdtdec_get_config_int(gd->fdt_blob, "rootdisk-offset", 0);
+ if (addr)
+ env_set_addr("rootaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
+#endif /* CONFIG_SYS_TEXT_BASE */
+}
+
+const char *bootdelay_process(void)
+{
+ char *s;
+ int bootdelay;
+
+ bootcount_inc();
+
+ s = env_get("bootdelay");
+ bootdelay = s ? (int)simple_strtol(s, NULL, 10) : CONFIG_BOOTDELAY;
+
+ if (IS_ENABLED(CONFIG_OF_CONTROL))
+ bootdelay = fdtdec_get_config_int(gd->fdt_blob, "bootdelay",
+ bootdelay);
+
+ debug("### main_loop entered: bootdelay=%d\n\n", bootdelay);
+
+ if (IS_ENABLED(CONFIG_AUTOBOOT_MENU_SHOW))
+ bootdelay = menu_show(bootdelay);
+ bootretry_init_cmd_timeout();
+
+#ifdef CONFIG_POST
+ if (gd->flags & GD_FLG_POSTFAIL) {
+ s = env_get("failbootcmd");
+ } else
+#endif /* CONFIG_POST */
+ if (bootcount_error())
+ s = env_get("altbootcmd");
+ else
+ s = env_get("bootcmd");
+
+ if (IS_ENABLED(CONFIG_OF_CONTROL))
+ process_fdt_options(gd->fdt_blob);
+ stored_bootdelay = bootdelay;
+
+ return s;
+}
+
+void autoboot_command(const char *s)
+{
+ debug("### main_loop: bootcmd=\"%s\"\n", s ? s : "<UNDEFINED>");
+
+ if (s && (stored_bootdelay == -2 ||
+ (stored_bootdelay != -1 && !abortboot(stored_bootdelay)))) {
+ bool lock;
+ int prev;
+
+ lock = IS_ENABLED(CONFIG_AUTOBOOT_KEYED) &&
+ !IS_ENABLED(CONFIG_AUTOBOOT_KEYED_CTRLC);
+ if (lock)
+ prev = disable_ctrlc(1); /* disable Ctrl-C checking */
+
+ run_command_list(s, -1, 0);
+
+ if (lock)
+ disable_ctrlc(prev); /* restore Ctrl-C checking */
+ }
+
+ if (IS_ENABLED(CONFIG_AUTOBOOT_USE_MENUKEY) &&
+ menukey == AUTOBOOT_MENUKEY) {
+ s = env_get("menucmd");
+ if (s)
+ run_command_list(s, -1, 0);
+ }
+}
--
cgit