efi/libstub/x86: Deal with exit() boot service returning

Even though it is uncommon, there are cases where the Exit() EFI boot
service might return, e.g., when we were booted via the EFI handover
protocol from OVMF and the kernel image was specified on the command
line, in which case Exit() attempts to terminate the boot manager,
which is not an EFI application itself.

So let's drop into an infinite loop instead of randomly executing code
that isn't expecting it.

Tested-by: Nathan Chancellor <natechancellor@gmail.com> # build
Signed-off-by: NArd Biesheuvel <ardb@kernel.org>
[ardb: put 'hlt' in deadloop]
Signed-off-by: NIngo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200303080648.21427-1-ardb@kernel.org
Link: https://lore.kernel.org/r/20200308080859.21568-15-ardb@kernel.org

drivers/firmware/efi/libstub/x86-stub.c

@@ -344,7 +344,8 @@ static void setup_graphics(struct boot_params *boot_params)
 static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status)
 {
 	efi_bs_call(exit, handle, status, 0, NULL);
-	unreachable();
+	for(;;)
+		asm("hlt");
 }
 
 void startup_32(struct boot_params *boot_params);