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efi: stub: implement efi_get_random_bytes() based on EFI_RNG_PROTOCOL

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This exposes the firmware's implementation of EFI_RNG_PROTOCOL via a new
function efi_get_random_bytes().

Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Ard Biesheuvel
2016-01-10 11:29:07 +01:00
committed by Catalin Marinas
parent c031a4213c
commit e4fbf47674
4 changed files with 44 additions and 2 deletions
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2
drivers/firmware/efi/libstub/Makefile
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@@ -36,7 +36,7 @@ lib-$(CONFIG_EFI_ARMSTUB) += arm-stub.o fdt.o string.o \
$(patsubst %.c,lib-%.o,$(arm-deps))
lib-$(CONFIG_ARM) += arm32-stub.o
lib-$(CONFIG_ARM64) += arm64-stub.o
lib-$(CONFIG_ARM64) += arm64-stub.o random.o
CFLAGS_arm64-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
#

3
drivers/firmware/efi/libstub/efistub.h
View File

@@ -43,4 +43,7 @@ void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
unsigned long desc_size, efi_memory_desc_t *runtime_map,
int *count);
efi_status_t efi_get_random_bytes(efi_system_table_t *sys_table,
unsigned long size, u8 *out);
#endif

35
drivers/firmware/efi/libstub/random.c Normal file
View File

@@ -0,0 +1,35 @@
/*
* Copyright (C) 2016 Linaro Ltd; <ard.biesheuvel@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/efi.h>
#include <asm/efi.h>
#include "efistub.h"
struct efi_rng_protocol {
efi_status_t (*get_info)(struct efi_rng_protocol *,
unsigned long *, efi_guid_t *);
efi_status_t (*get_rng)(struct efi_rng_protocol *,
efi_guid_t *, unsigned long, u8 *out);
};
efi_status_t efi_get_random_bytes(efi_system_table_t *sys_table_arg,
unsigned long size, u8 *out)
{
efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID;
efi_status_t status;
struct efi_rng_protocol *rng;
status = efi_call_early(locate_protocol, &rng_proto, NULL,
(void **)&rng);
if (status != EFI_SUCCESS)
return status;
return rng->get_rng(rng, NULL, size, out);
}