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efi_loader: installation of EFI_RNG_PROTOCOL

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Having an EFI_RNG_PROTOCOL without a backing RNG device leads to failure
to boot Linux 5.8.

Only install the EFI_RNG_PROTOCOL if we have a RNG device.

Reported-by: Scott K Logan <logans@cottsay.net>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt
2020-09-25 12:50:19 +02:00
parent 796933510f
commit b59c13d42f
4 changed files with 36 additions and 6 deletions
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30
lib/efi_loader/efi_rng.c
View File

@@ -3,6 +3,8 @@
* Copyright (c) 2019, Linaro Limited
*/
#define LOG_CATEGORY LOGC_EFI
#include <common.h>
#include <dm.h>
#include <efi_loader.h>
@@ -144,7 +146,33 @@ back:
return EFI_EXIT(status);
}
const struct efi_rng_protocol efi_rng_protocol = {
static const struct efi_rng_protocol efi_rng_protocol = {
.get_info = rng_getinfo,
.get_rng = getrng,
};
/**
* efi_rng_register() - register EFI_RNG_PROTOCOL
*
* If a RNG device is available, the Random Number Generator Protocol is
* registered.
*
* Return: An error status is only returned if adding the protocol fails.
*/
efi_status_t efi_rng_register(void)
{
efi_status_t ret;
struct udevice *dev;
ret = platform_get_rng_device(&dev);
if (ret != EFI_SUCCESS) {
log_warning("Missing RNG device for EFI_RNG_PROTOCOL");
return EFI_SUCCESS;
}
ret = efi_add_protocol(efi_root, &efi_guid_rng_protocol,
(void *)&efi_rng_protocol);
if (ret != EFI_SUCCESS)
log_err("Cannot install EFI_RNG_PROTOCOL");
return ret;
}