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efi/x86: Add RNG seed EFI table to unencrypted mapping check

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When booting with SME active, EFI tables must be mapped unencrypted since
they were built by UEFI in unencrypted memory. Update the list of tables
to be checked during early_memremap() processing to account for the EFI
RNG seed table.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: linux-efi@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: David Hildenbrand <david@redhat.com>
Cc: Heinrich Schuchardt <xypron.glpk@gmx.de>
Link: https://lore.kernel.org/r/b64385fc13e5d7ad4b459216524f138e7879234f.1582662842.git.thomas.lendacky@amd.com
Link: https://lore.kernel.org/r/20200228121408.9075-3-ardb@kernel.org
This commit is contained in:
Tom Lendacky 2020-02-28 13:14:04 +01:00 committed by Ingo Molnar
parent f10e80a19b
commit badc61982a
3 changed files with 13 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/platform/efi/efi.c
View File

@ -90,6 +90,7 @@ static const unsigned long * const efi_tables[] = {
#endif
&efi.tpm_log,
&efi.tpm_final_log,
&efi_rng_seed,
};
u64 efi_setup; /* efi setup_data physical address */

18
drivers/firmware/efi/efi.c
View File

@ -45,7 +45,7 @@ struct efi __read_mostly efi = {
};
EXPORT_SYMBOL(efi);
static unsigned long __ro_after_init rng_seed = EFI_INVALID_TABLE_ADDR;
unsigned long __ro_after_init efi_rng_seed = EFI_INVALID_TABLE_ADDR;
static unsigned long __initdata mem_reserve = EFI_INVALID_TABLE_ADDR;
static unsigned long __initdata rt_prop = EFI_INVALID_TABLE_ADDR;
@ -451,7 +451,7 @@ static const efi_config_table_type_t common_tables[] __initconst = {
{SMBIOS3_TABLE_GUID, "SMBIOS 3.0", &efi.smbios3},
{EFI_SYSTEM_RESOURCE_TABLE_GUID, "ESRT", &efi.esrt},
{EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi_mem_attr_table},
{LINUX_EFI_RANDOM_SEED_TABLE_GUID, "RNG", &rng_seed},
{LINUX_EFI_RANDOM_SEED_TABLE_GUID, "RNG", &efi_rng_seed},
{LINUX_EFI_TPM_EVENT_LOG_GUID, "TPMEventLog", &efi.tpm_log},
{LINUX_EFI_TPM_FINAL_LOG_GUID, "TPMFinalLog", &efi.tpm_final_log},
{LINUX_EFI_MEMRESERVE_TABLE_GUID, "MEMRESERVE", &mem_reserve},
@ -519,11 +519,11 @@ int __init efi_config_parse_tables(const efi_config_table_t *config_tables,
pr_cont("\n");
set_bit(EFI_CONFIG_TABLES, &efi.flags);
if (rng_seed != EFI_INVALID_TABLE_ADDR) {
if (efi_rng_seed != EFI_INVALID_TABLE_ADDR) {
struct linux_efi_random_seed *seed;
u32 size = 0;
seed = early_memremap(rng_seed, sizeof(*seed));
seed = early_memremap(efi_rng_seed, sizeof(*seed));
if (seed != NULL) {
size = seed->size;
early_memunmap(seed, sizeof(*seed));
@ -531,7 +531,8 @@ int __init efi_config_parse_tables(const efi_config_table_t *config_tables,
pr_err("Could not map UEFI random seed!\n");
}
if (size > 0) {
seed = early_memremap(rng_seed, sizeof(*seed) + size);
seed = early_memremap(efi_rng_seed,
sizeof(*seed) + size);
if (seed != NULL) {
pr_notice("seeding entropy pool\n");
add_bootloader_randomness(seed->bits, seed->size);
@ -923,7 +924,7 @@ static int update_efi_random_seed(struct notifier_block *nb,
if (!kexec_in_progress)
return NOTIFY_DONE;
seed = memremap(rng_seed, sizeof(*seed), MEMREMAP_WB);
seed = memremap(efi_rng_seed, sizeof(*seed), MEMREMAP_WB);
if (seed != NULL) {
size = min(seed->size, EFI_RANDOM_SEED_SIZE);
memunmap(seed);
@ -931,7 +932,8 @@ static int update_efi_random_seed(struct notifier_block *nb,
pr_err("Could not map UEFI random seed!\n");
}
if (size > 0) {
seed = memremap(rng_seed, sizeof(*seed) + size, MEMREMAP_WB);
seed = memremap(efi_rng_seed, sizeof(*seed) + size,
MEMREMAP_WB);
if (seed != NULL) {
seed->size = size;
get_random_bytes(seed->bits, seed->size);
@ -949,7 +951,7 @@ static struct notifier_block efi_random_seed_nb = {
static int __init register_update_efi_random_seed(void)
{
if (rng_seed == EFI_INVALID_TABLE_ADDR)
if (efi_rng_seed == EFI_INVALID_TABLE_ADDR)
return 0;
return register_reboot_notifier(&efi_random_seed_nb);
}

2
include/linux/efi.h
View File

@ -526,6 +526,8 @@ typedef struct {
efi_time_t time_of_revocation;
} efi_cert_x509_sha256_t;
extern unsigned long __ro_after_init efi_rng_seed; /* RNG Seed table */
/*
* All runtime access to EFI goes through this structure:
*/