Commit 056a68ce authored by Jason A. Donenfeld's avatar Jason A. Donenfeld Committed by Thomas Bogendoerfer
Browse files

mips: allow firmware to pass RNG seed to kernel 



Nearly all other firmware environments have some way of passing a RNG
seed to initialize the RNG: DTB's rng-seed, EFI's RNG protocol, m68k's
bootinfo block, x86's setup_data, and so forth. This adds something
similar for MIPS, which will allow various firmware environments,
bootloaders, and hypervisors to pass an RNG seed to initialize the
kernel's RNG.

Signed-off-by: default avatarJason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
parent 8e6ec6ce

arch/mips/kernel/setup.c

+21 −0
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ 
#include <asm/setup.h>

#include <asm/smp-ops.h>

#include <asm/prom.h>

#include <asm/fw/fw.h>



#ifdef CONFIG_MIPS_ELF_APPENDED_DTB

char __section(".appended_dtb") __appended_dtb[0x100000];
@@ -756,6 +757,24 @@ static void __init prefill_possible_map(void) 
static inline void prefill_possible_map(void) {}

#endif



static void __init setup_rng_seed(void)

{

	char *rng_seed_hex = fw_getenv("rngseed");

	u8 rng_seed[512];

	size_t len;



	if (!rng_seed_hex)

		return;



	len = min(sizeof(rng_seed), strlen(rng_seed_hex) / 2);

	if (hex2bin(rng_seed, rng_seed_hex, len))

		return;



	add_bootloader_randomness(rng_seed, len);

	memzero_explicit(rng_seed, len);

	memzero_explicit(rng_seed_hex, len * 2);

}



void __init setup_arch(char **cmdline_p)

{

	cpu_probe();
@@ -786,6 +805,8 @@ void __init setup_arch(char **cmdline_p) 
	paging_init();



	memblock_dump_all();



	setup_rng_seed();

}



unsigned long kernelsp[NR_CPUS];