mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-10 15:14:43 +00:00
3616218b5a
- Generally we just drop the #ifdef CONFIG_SYS_LONGHELP and endif lines and use U_BOOT_LONGHELP to declare the same variable name as before - In a few places, either rename the variable to follow convention or introduce the variable as it was being done inline before. Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* The 'kaslrseed' command takes bytes from the hardware random number
|
|
* generator and uses them to set the kaslr-seed value in the chosen node.
|
|
*
|
|
* Copyright (c) 2021, Chris Morgan <macromorgan@hotmail.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <dm.h>
|
|
#include <hexdump.h>
|
|
#include <malloc.h>
|
|
#include <rng.h>
|
|
#include <fdt_support.h>
|
|
|
|
static int do_kaslr_seed(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
|
|
{
|
|
size_t n = 0x8;
|
|
struct udevice *dev;
|
|
u64 *buf;
|
|
int nodeoffset;
|
|
int ret = CMD_RET_SUCCESS;
|
|
|
|
if (uclass_get_device(UCLASS_RNG, 0, &dev) || !dev) {
|
|
printf("No RNG device\n");
|
|
return CMD_RET_FAILURE;
|
|
}
|
|
|
|
buf = malloc(n);
|
|
if (!buf) {
|
|
printf("Out of memory\n");
|
|
return CMD_RET_FAILURE;
|
|
}
|
|
|
|
if (dm_rng_read(dev, buf, n)) {
|
|
printf("Reading RNG failed\n");
|
|
return CMD_RET_FAILURE;
|
|
}
|
|
|
|
if (!working_fdt) {
|
|
printf("No FDT memory address configured. Please configure\n"
|
|
"the FDT address via \"fdt addr <address>\" command.\n"
|
|
"Aborting!\n");
|
|
return CMD_RET_FAILURE;
|
|
}
|
|
|
|
ret = fdt_check_header(working_fdt);
|
|
if (ret < 0) {
|
|
printf("fdt_chosen: %s\n", fdt_strerror(ret));
|
|
return CMD_RET_FAILURE;
|
|
}
|
|
|
|
nodeoffset = fdt_find_or_add_subnode(working_fdt, 0, "chosen");
|
|
if (nodeoffset < 0) {
|
|
printf("Reading chosen node failed\n");
|
|
return CMD_RET_FAILURE;
|
|
}
|
|
|
|
ret = fdt_setprop(working_fdt, nodeoffset, "kaslr-seed", buf, sizeof(buf));
|
|
if (ret < 0) {
|
|
printf("Unable to set kaslr-seed on chosen node: %s\n", fdt_strerror(ret));
|
|
return CMD_RET_FAILURE;
|
|
}
|
|
|
|
free(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
U_BOOT_LONGHELP(kaslrseed,
|
|
"[n]\n"
|
|
" - append random bytes to chosen kaslr-seed node\n");
|
|
|
|
U_BOOT_CMD(
|
|
kaslrseed, 1, 0, do_kaslr_seed,
|
|
"feed bytes from the hardware random number generator to the kaslr-seed",
|
|
kaslrseed_help_text
|
|
);
|