bfebc8c965
We are now using an env_ prefix for environment functions. Rename these for consistency. Also add function comments in common.h. Suggested-by: Wolfgang Denk <wd@denx.de> Signed-off-by: Simon Glass <sjg@chromium.org>
366 lines
8.3 KiB
C
366 lines
8.3 KiB
C
/*
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* (C) Copyright 2000
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <autoboot.h>
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#include <bootretry.h>
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#include <cli.h>
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#include <console.h>
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#include <fdtdec.h>
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#include <menu.h>
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#include <post.h>
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#include <u-boot/sha256.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define MAX_DELAY_STOP_STR 32
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#ifndef DEBUG_BOOTKEYS
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#define DEBUG_BOOTKEYS 0
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#endif
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#define debug_bootkeys(fmt, args...) \
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debug_cond(DEBUG_BOOTKEYS, fmt, ##args)
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/* Stored value of bootdelay, used by autoboot_command() */
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static int stored_bootdelay;
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#if defined(CONFIG_AUTOBOOT_KEYED)
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#if defined(CONFIG_AUTOBOOT_STOP_STR_SHA256)
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/*
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* Use a "constant-length" time compare function for this
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* hash compare:
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*
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* https://crackstation.net/hashing-security.htm
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*/
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static int slow_equals(u8 *a, u8 *b, int len)
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{
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int diff = 0;
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int i;
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for (i = 0; i < len; i++)
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diff |= a[i] ^ b[i];
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return diff == 0;
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}
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static int passwd_abort(uint64_t etime)
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{
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const char *sha_env_str = env_get("bootstopkeysha256");
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u8 sha_env[SHA256_SUM_LEN];
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u8 sha[SHA256_SUM_LEN];
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char presskey[MAX_DELAY_STOP_STR];
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const char *algo_name = "sha256";
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u_int presskey_len = 0;
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int abort = 0;
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int size;
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int ret;
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if (sha_env_str == NULL)
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sha_env_str = CONFIG_AUTOBOOT_STOP_STR_SHA256;
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/*
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* Generate the binary value from the environment hash value
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* so that we can compare this value with the computed hash
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* from the user input
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*/
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ret = hash_parse_string(algo_name, sha_env_str, sha_env);
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if (ret) {
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printf("Hash %s not supported!\n", algo_name);
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return 0;
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}
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/*
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* We don't know how long the stop-string is, so we need to
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* generate the sha256 hash upon each input character and
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* compare the value with the one saved in the environment
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*/
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do {
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if (tstc()) {
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/* Check for input string overflow */
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if (presskey_len >= MAX_DELAY_STOP_STR)
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return 0;
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presskey[presskey_len++] = getc();
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/* Calculate sha256 upon each new char */
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hash_block(algo_name, (const void *)presskey,
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presskey_len, sha, &size);
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/* And check if sha matches saved value in env */
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if (slow_equals(sha, sha_env, SHA256_SUM_LEN))
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abort = 1;
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}
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} while (!abort && get_ticks() <= etime);
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return abort;
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}
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#else
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static int passwd_abort(uint64_t etime)
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{
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int abort = 0;
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struct {
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char *str;
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u_int len;
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int retry;
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}
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delaykey[] = {
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{ .str = env_get("bootdelaykey"), .retry = 1 },
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{ .str = env_get("bootstopkey"), .retry = 0 },
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};
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char presskey[MAX_DELAY_STOP_STR];
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u_int presskey_len = 0;
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u_int presskey_max = 0;
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u_int i;
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# ifdef CONFIG_AUTOBOOT_DELAY_STR
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if (delaykey[0].str == NULL)
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delaykey[0].str = CONFIG_AUTOBOOT_DELAY_STR;
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# endif
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# ifdef CONFIG_AUTOBOOT_STOP_STR
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if (delaykey[1].str == NULL)
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delaykey[1].str = CONFIG_AUTOBOOT_STOP_STR;
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# endif
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for (i = 0; i < sizeof(delaykey) / sizeof(delaykey[0]); i++) {
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delaykey[i].len = delaykey[i].str == NULL ?
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0 : strlen(delaykey[i].str);
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delaykey[i].len = delaykey[i].len > MAX_DELAY_STOP_STR ?
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MAX_DELAY_STOP_STR : delaykey[i].len;
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presskey_max = presskey_max > delaykey[i].len ?
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presskey_max : delaykey[i].len;
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debug_bootkeys("%s key:<%s>\n",
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delaykey[i].retry ? "delay" : "stop",
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delaykey[i].str ? delaykey[i].str : "NULL");
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}
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/* In order to keep up with incoming data, check timeout only
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* when catch up.
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*/
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do {
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if (tstc()) {
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if (presskey_len < presskey_max) {
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presskey[presskey_len++] = getc();
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} else {
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for (i = 0; i < presskey_max - 1; i++)
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presskey[i] = presskey[i + 1];
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presskey[i] = getc();
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}
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}
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for (i = 0; i < sizeof(delaykey) / sizeof(delaykey[0]); i++) {
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if (delaykey[i].len > 0 &&
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presskey_len >= delaykey[i].len &&
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memcmp(presskey + presskey_len -
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delaykey[i].len, delaykey[i].str,
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delaykey[i].len) == 0) {
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debug_bootkeys("got %skey\n",
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delaykey[i].retry ? "delay" :
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"stop");
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/* don't retry auto boot */
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if (!delaykey[i].retry)
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bootretry_dont_retry();
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abort = 1;
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}
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}
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} while (!abort && get_ticks() <= etime);
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return abort;
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}
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#endif
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/***************************************************************************
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* Watch for 'delay' seconds for autoboot stop or autoboot delay string.
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* returns: 0 - no key string, allow autoboot 1 - got key string, abort
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*/
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static int __abortboot(int bootdelay)
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{
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int abort;
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uint64_t etime = endtick(bootdelay);
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# ifdef CONFIG_AUTOBOOT_PROMPT
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/*
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* CONFIG_AUTOBOOT_PROMPT includes the %d for all boards.
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* To print the bootdelay value upon bootup.
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*/
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printf(CONFIG_AUTOBOOT_PROMPT, bootdelay);
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# endif
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abort = passwd_abort(etime);
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if (!abort)
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debug_bootkeys("key timeout\n");
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return abort;
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}
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# else /* !defined(CONFIG_AUTOBOOT_KEYED) */
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#ifdef CONFIG_MENUKEY
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static int menukey;
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#endif
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static int __abortboot(int bootdelay)
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{
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int abort = 0;
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unsigned long ts;
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#ifdef CONFIG_MENUPROMPT
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printf(CONFIG_MENUPROMPT);
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#else
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printf("Hit any key to stop autoboot: %2d ", bootdelay);
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#endif
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/*
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* Check if key already pressed
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*/
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if (tstc()) { /* we got a key press */
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(void) getc(); /* consume input */
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puts("\b\b\b 0");
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abort = 1; /* don't auto boot */
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}
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while ((bootdelay > 0) && (!abort)) {
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--bootdelay;
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/* delay 1000 ms */
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ts = get_timer(0);
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do {
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if (tstc()) { /* we got a key press */
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abort = 1; /* don't auto boot */
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bootdelay = 0; /* no more delay */
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# ifdef CONFIG_MENUKEY
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menukey = getc();
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# else
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(void) getc(); /* consume input */
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# endif
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break;
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}
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udelay(10000);
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} while (!abort && get_timer(ts) < 1000);
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printf("\b\b\b%2d ", bootdelay);
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}
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putc('\n');
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return abort;
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}
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# endif /* CONFIG_AUTOBOOT_KEYED */
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static int abortboot(int bootdelay)
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{
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int abort = 0;
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if (bootdelay >= 0)
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abort = __abortboot(bootdelay);
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#ifdef CONFIG_SILENT_CONSOLE
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if (abort)
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gd->flags &= ~GD_FLG_SILENT;
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#endif
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return abort;
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}
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static void process_fdt_options(const void *blob)
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{
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#if defined(CONFIG_OF_CONTROL) && defined(CONFIG_SYS_TEXT_BASE)
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ulong addr;
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/* Add an env variable to point to a kernel payload, if available */
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addr = fdtdec_get_config_int(gd->fdt_blob, "kernel-offset", 0);
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if (addr)
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env_set_addr("kernaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
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/* Add an env variable to point to a root disk, if available */
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addr = fdtdec_get_config_int(gd->fdt_blob, "rootdisk-offset", 0);
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if (addr)
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env_set_addr("rootaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
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#endif /* CONFIG_OF_CONTROL && CONFIG_SYS_TEXT_BASE */
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}
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const char *bootdelay_process(void)
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{
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char *s;
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int bootdelay;
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#ifdef CONFIG_BOOTCOUNT_LIMIT
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unsigned long bootcount = 0;
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unsigned long bootlimit = 0;
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#endif /* CONFIG_BOOTCOUNT_LIMIT */
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#ifdef CONFIG_BOOTCOUNT_LIMIT
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bootcount = bootcount_load();
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bootcount++;
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bootcount_store(bootcount);
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env_set_ulong("bootcount", bootcount);
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bootlimit = env_get_ulong("bootlimit", 10, 0);
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#endif /* CONFIG_BOOTCOUNT_LIMIT */
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s = env_get("bootdelay");
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bootdelay = s ? (int)simple_strtol(s, NULL, 10) : CONFIG_BOOTDELAY;
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#ifdef CONFIG_OF_CONTROL
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bootdelay = fdtdec_get_config_int(gd->fdt_blob, "bootdelay",
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bootdelay);
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#endif
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debug("### main_loop entered: bootdelay=%d\n\n", bootdelay);
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#if defined(CONFIG_MENU_SHOW)
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bootdelay = menu_show(bootdelay);
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#endif
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bootretry_init_cmd_timeout();
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#ifdef CONFIG_POST
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if (gd->flags & GD_FLG_POSTFAIL) {
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s = env_get("failbootcmd");
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} else
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#endif /* CONFIG_POST */
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#ifdef CONFIG_BOOTCOUNT_LIMIT
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if (bootlimit && (bootcount > bootlimit)) {
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printf("Warning: Bootlimit (%u) exceeded. Using altbootcmd.\n",
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(unsigned)bootlimit);
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s = env_get("altbootcmd");
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} else
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#endif /* CONFIG_BOOTCOUNT_LIMIT */
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s = env_get("bootcmd");
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process_fdt_options(gd->fdt_blob);
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stored_bootdelay = bootdelay;
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return s;
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}
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void autoboot_command(const char *s)
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{
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debug("### main_loop: bootcmd=\"%s\"\n", s ? s : "<UNDEFINED>");
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if (stored_bootdelay != -1 && s && !abortboot(stored_bootdelay)) {
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#if defined(CONFIG_AUTOBOOT_KEYED) && !defined(CONFIG_AUTOBOOT_KEYED_CTRLC)
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int prev = disable_ctrlc(1); /* disable Control C checking */
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#endif
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run_command_list(s, -1, 0);
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#if defined(CONFIG_AUTOBOOT_KEYED) && !defined(CONFIG_AUTOBOOT_KEYED_CTRLC)
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disable_ctrlc(prev); /* restore Control C checking */
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#endif
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}
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#ifdef CONFIG_MENUKEY
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if (menukey == CONFIG_MENUKEY) {
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s = env_get("menucmd");
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if (s)
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run_command_list(s, -1, 0);
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}
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#endif /* CONFIG_MENUKEY */
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}
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