Provide a unit test for the EFI_RNG_PROTOCOL.
The list of algorithms is read. Two random numbers are generated. The test checks that the two numbers differ.
Signed-off-by: Heinrich Schuchardt xypron.glpk@gmx.de --- The patch depends on pending patches to implement the EFI_RNG_PROTOCOL. --- lib/efi_selftest/Makefile | 1 + lib/efi_selftest/efi_selftest_rng.c | 111 ++++++++++++++++++++++++++++ 2 files changed, 112 insertions(+) create mode 100644 lib/efi_selftest/efi_selftest_rng.c
diff --git a/lib/efi_selftest/Makefile b/lib/efi_selftest/Makefile index 487cb4c674..3ad96e1cbf 100644 --- a/lib/efi_selftest/Makefile +++ b/lib/efi_selftest/Makefile @@ -47,6 +47,7 @@ efi_selftest_unicode_collation.o
obj-$(CONFIG_CPU_V7) += efi_selftest_unaligned.o obj-$(CONFIG_EFI_LOADER_HII) += efi_selftest_hii.o +obj-$(CONFIG_EFI_RNG_PROTOCOL) += efi_selftest_rng.o obj-$(CONFIG_EFI_GET_TIME) += efi_selftest_rtc.o
ifeq ($(CONFIG_GENERATE_ACPI_TABLE),) diff --git a/lib/efi_selftest/efi_selftest_rng.c b/lib/efi_selftest/efi_selftest_rng.c new file mode 100644 index 0000000000..06e1635515 --- /dev/null +++ b/lib/efi_selftest/efi_selftest_rng.c @@ -0,0 +1,111 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * efi_selftest_rng + * + * Copyright (c) 2019 Heinrich Schuchardt xypron.glpk@gmx.de + * + * Test the random number generator service. + */ + +#include <efi_selftest.h> +#include <efi_rng.h> + +#define RNG_LEN 9 + +static struct efi_boot_services *boottime; +static efi_guid_t efi_rng_guid = EFI_RNG_PROTOCOL_GUID; + +/* + * Setup unit test. + * + * @handle: handle of the loaded image + * @systable: system table + * @return: EFI_ST_SUCCESS for success + */ +static int setup(const efi_handle_t handle, + const struct efi_system_table *systable) +{ + boottime = systable->boottime; + return EFI_ST_SUCCESS; +} + +/* + * Execute unit test. + * + * Retrieve available RNG algorithms. + * Retrieve two random values and compare them. + * + * @return: EFI_ST_SUCCESS for success + */ +static int execute(void) +{ + efi_status_t ret; + efi_uintn_t size; + struct efi_rng_protocol *rng; + efi_guid_t *algo_list; + u8 rnd1[RNG_LEN] __aligned(4), rnd2[RNG_LEN] __aligned(4); + int r; + + /* Get random number generator protocol */ + ret = boottime->locate_protocol(&efi_rng_guid, NULL, (void **)&rng); + if (ret != EFI_SUCCESS) { + efi_st_error( + "Random number generator protocol not available\n"); + return EFI_ST_FAILURE; + } + + ret = rng->get_info(rng, &size, NULL); + if (ret != EFI_BUFFER_TOO_SMALL) { + efi_st_error("Could not retrieve alorithm list size\n"); + return EFI_ST_FAILURE; + } + if (size < sizeof(efi_guid_t)) { + efi_st_error("Empty alorithm list\n"); + return EFI_ST_FAILURE; + } + + ret = boottime->allocate_pool(EFI_LOADER_DATA, size, + (void **)&algo_list); + if (ret != EFI_SUCCESS) { + efi_st_error("Could not allocate pool memory\n"); + return EFI_ST_FAILURE; + } + + ret = rng->get_info(rng, &size, algo_list); + if (ret != EFI_SUCCESS) { + efi_st_error("Could not get info\n"); + return EFI_ST_FAILURE; + } + if (size < sizeof(efi_guid_t)) { + efi_st_error("Empty alorithm list\n"); + return EFI_ST_FAILURE; + } + + memset(rnd1, 0, RNG_LEN); + memset(rnd2, 0, RNG_LEN); + + ret = rng->get_rng(rng, NULL, RNG_LEN - 1, &rnd1[1]); + if (ret != EFI_SUCCESS) { + efi_st_error("Could not get random value\n"); + return EFI_ST_FAILURE; + } + ret = rng->get_rng(rng, NULL, RNG_LEN - 1, &rnd2[1]); + if (ret != EFI_SUCCESS) { + efi_st_error("Could not get random value\n"); + return EFI_ST_FAILURE; + } + r = memcmp(rnd1, rnd2, RNG_LEN); + if (!r) { + efi_st_error("Two equal consecutive random numbers\n"); + return EFI_ST_FAILURE; + } + + return EFI_ST_SUCCESS; +} + +EFI_UNIT_TEST(rng) = { + .name = "random number generator", + .phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT, + .setup = setup, + .execute = execute, +}; -- 2.24.1