mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
2d06fd839d
The call to hash_block in passwd_abort fails with error ENOSPC on some systems. The reason is that the variable which specifies the size of the buffer to contain the computed hash does not get initialized. This patch initializes the variable with the size of the buffer. Signed-off-by: Martin Etnestad <martin.etnestad@appeartv.com>
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 = sizeof(sha);
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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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