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.

Dominik Brodowski committed 7 years ago

Commit 0d959811 parent 41e8a7c4 files · +8 −4Browse files

Showing the changes to include/linux (1 of 4 files). Show all

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include/linux/efi.h+2−0

@@ -1645,6 +1645,8 @@ static inline void · 1644 unmodified lines
1645	1645	efi_enable_reset_attack_mitigation(efi_system_table_t *sys_table_arg) { }
1646	1646	#endif
1647	1647
	1648	+efi_status_t efi_random_get_seed(efi_system_table_t *sys_table_arg);
	1649	+
1648	1650	void efi_retrieve_tpm2_eventlog(efi_system_table_t *sys_table);
1649	1651
1650	1652	/*

x86: efi/random: Invoke EFI_RNG_PROTOCOL to seed the UEFI RNG table

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