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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2020 Broadcom Corporation
* Joel Peshkin, Broadcom Corporation, joel.peshkin@broadcom.com
*/
#define DEBUG
#include <common.h>
#include <command.h>
#include <environment.h>
#include <hexdump.h>
#include <linux/ctype.h>
#include <linux/stddef.h>
#include <errno.h>
#include <bca_sdk.h>
DECLARE_GLOBAL_DATA_PTR;
static const char *null_env = "\0\0\0\0";
#define BCM_LOCKDOWN_MAX_ENV_NAME 64
#define BCM_LOCKDOWN_MAX_ENV_VALUE 520
/* also limit with CONFIG_ENV_SIZE */
static void lock_env_add_safe(char *name, char *val, char * safe, int max);
static void lock_env_add_safe(char *name, char *val, char *safe, int max)
{
int l;
int i;
char v[2];
v[1] = '\0';
l = strlen(val);
if (l > max) {
return;
}
for (i = 0 ; i < l ; i++) {
v[0] = val[i];
if (!(isalnum(val[i]) || (NULL != strstr(safe,v)))) {
/* printf("rejected '%s'='%s'\n",name,val); */
return;
}
}
env_set(name, val);
}
int env_override_import(void *ep)
{
char *cp = ((char *)ep) + 4; /* skip length field */
char *delim;
env_import ((void *) null_env, 0);
env_set("overridden", "true");
while (*cp != '\0') {
delim = strstr(cp,"=");
if (delim && (delim <= cp + BCM_LOCKDOWN_MAX_ENV_NAME) && (delim <= ep + CONFIG_ENV_SIZE)) {
*delim = '\0';
delim++;
if (strlen(delim) > BCM_LOCKDOWN_MAX_ENV_VALUE) {
break;
}
/* if we made it this far, *cp and *delim point to name and value */
if ((strcmp(cp,"IMAGE") == 0) || (strcmp(cp,"MCB") == 0) || (strcmp(cp,"ethaddr") == 0)) {
lock_env_add_safe(cp,delim,":,",32);
} else if (strncmp(cp,"demo_",5) == 0) {
env_set(cp,delim);
} else if (strcmp(cp,"env_boot_magic") == 0) {
lock_env_add_safe(cp,delim,"@,",32);
} else if (strncmp(cp,"rdp",3) == 0) {
lock_env_add_safe(cp,delim,"",6);
} else if (strcmp(cp,"nummacaddrs") == 0) {
lock_env_add_safe(cp,delim,"_",32);
} else if (strcmp(cp,"boardid") == 0) {
lock_env_add_safe(cp,delim,"_",32);
} else {
/* printf("skipped '%s'='%s'\n",cp,delim); */
}
/* done with conditional import */
cp = delim + strlen(delim) + 1;
} else {
break;
}
}
env_set("bootdelay", "1");
env_set("bootcmd", "printenv;sdk boot_img");
/* gd->flags |= GD_FLG_SILENT | GD_FLG_DISABLE_CONSOLE; */
gd->flags |= GD_FLG_DISABLE_CONSOLE;
return 1;
}
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