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x86/boot: efistub: Assign global boot_params variable

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From: Ard Biesheuvel <ardb@kernel.org>

[ Commit 50dcc2e0d62e3c4a54f39673c4dc3dcde7c74d52 upstream ]

Now that the x86 EFI stub calls into some APIs exposed by the
decompressor (e.g., kaslr_get_random_long()), it is necessary to ensure
that the global boot_params variable is set correctly before doing so.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ard Biesheuvel
2024-03-04 12:19:55 +01:00
committed by Greg Kroah-Hartman
parent 8f05493706
commit 3a396c409a
1 changed files with 2 additions and 0 deletions
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2
drivers/firmware/efi/libstub/x86-stub.c
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@@ -827,6 +827,8 @@ void __noreturn efi_stub_entry(efi_handle_t handle,
unsigned long kernel_entry;
efi_status_t status;
boot_params_ptr = boot_params;
efi_system_table = sys_table_arg;
/* Check if we were booted by the EFI firmware */
if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)