x86, efi: Add dedicated EFI stub entry point

The method used to work out whether we were booted by EFI firmware or
via a boot loader is broken. Because efi_main() is always executed
when booting from a boot loader we will dereference invalid pointers
either on the stack (CONFIG_X86_32) or contained in %rdx
(CONFIG_X86_64) when searching for an EFI System Table signature.

Instead of dereferencing these invalid system table pointers, add a
new entry point that is only used when booting from EFI firmware, when
we know the pointer arguments will be valid. With this change legacy
boot loaders will no longer execute efi_main(), but will instead skip
EFI stub initialisation completely.

[ hpa: Marking this for urgent/stable since it is a regression when
  the option is enabled; without the option the patch has no effect ]

Signed-off-by: Matt Fleming <matt.hfleming@intel.com>
Link: http://lkml.kernel.org/r/1334584744.26997.14.camel@mfleming-mobl1.ger.corp.intel.com
Reported-by: Jordan Justen <jordan.l.justen@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: <stable@vger.kernel.org> v3.3

1 files changed, 11 insertions, 3 deletions

diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S
index a0559930a180..c85e3ac99bba 100644
--- a/arch/x86/boot/compressed/head_32.S
+++ b/arch/x86/boot/compressed/head_32.S
@@ -33,6 +33,9 @@
         __HEAD
 ENTRY(startup_32)
 #ifdef CONFIG_EFI_STUB
+        jmp     preferred_addr
+
+        .balign 0x10
         /*
          * We don't need the return address, so set up the stack so
          * efi_main() can find its arugments.
@@ -41,12 +44,17 @@ ENTRY(startup_32)
 
         call    efi_main
         cmpl    $0, %eax
-        je      preferred_addr
         movl    %eax, %esi
-        call    1f
+        jne     2f
 1:
+        /* EFI init failed, so hang. */
+        hlt
+        jmp     1b
+2:
+        call    3f
+3:
         popl    %eax
-        subl    $1b, %eax
+        subl    $3b, %eax
         subl    BP_pref_address(%esi), %eax
         add     BP_code32_start(%esi), %eax
         leal    preferred_addr(%eax), %eax