From 0d95981438c3bdb53cc99b0fb656d24d7a80e1f3 Mon Sep 17 00:00:00 2001 From: Dominik Brodowski Date: Wed, 6 Nov 2019 08:06:13 +0100 Subject: x86: efi/random: Invoke EFI_RNG_PROTOCOL to seed the UEFI RNG table Invoke the EFI_RNG_PROTOCOL protocol in the context of the x86 EFI stub, same as is done on arm/arm64 since commit 568bc4e87033 ("efi/arm*/libstub: Invoke EFI_RNG_PROTOCOL to seed the UEFI RNG table"). Within the stub, a Linux-specific RNG seed UEFI config table will be seeded. The EFI routines in the core kernel will pick that up later, yet still early during boot, to seed the kernel entropy pool. If CONFIG_RANDOM_TRUST_BOOTLOADER, entropy is credited for this seed. Signed-off-by: Dominik Brodowski Signed-off-by: Ard Biesheuvel --- arch/x86/boot/compressed/eboot.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/x86') diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c index 82bc60c8acb2..68945c5700bf 100644 --- a/arch/x86/boot/compressed/eboot.c +++ b/arch/x86/boot/compressed/eboot.c @@ -782,6 +782,9 @@ efi_main(struct efi_config *c, struct boot_params *boot_params) /* Ask the firmware to clear memory on unclean shutdown */ efi_enable_reset_attack_mitigation(sys_table); + + efi_random_get_seed(sys_table); + efi_retrieve_tpm2_eventlog(sys_table); setup_graphics(boot_params); -- cgit v1.2.3-59-g8ed1b