shim/shim-vendor-cert-file.patch

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2012-08-14 15:53:51 +00:00
From be817236507a104ec9b0e8be57daab0e2bab40ce Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Mon, 13 Aug 2012 17:06:46 -0400
Subject: [PATCH] Allow specification of vendor_cert through a build command
line option.
This allows you to specify the vendor_cert as a file on the command line
during build.
---
Makefile | 16 +++++++++++-----
cert.S | 32 ++++++++++++++++++++++++++++++++
cert.h | 1 -
shim.c | 6 +++---
4 files changed, 46 insertions(+), 9 deletions(-)
create mode 100644 cert.S
delete mode 100644 cert.h
diff --git a/Makefile b/Makefile
index 1e3a020..66b105f 100644
--- a/Makefile
+++ b/Makefile
@@ -14,24 +14,30 @@ EFI_LIBS = -lefi -lgnuefi --start-group Cryptlib/libcryptlib.a Cryptlib/OpenSSL/
EFI_CRT_OBJS = $(EFI_PATH)/crt0-efi-$(ARCH).o
EFI_LDS = $(EFI_PATH)/elf_$(ARCH)_efi.lds
-
CFLAGS = -ggdb -O0 -fno-stack-protector -fno-strict-aliasing -fpic -fshort-wchar \
-Wall -mno-red-zone \
$(EFI_INCLUDES)
ifeq ($(ARCH),x86_64)
CFLAGS += -DEFI_FUNCTION_WRAPPER
endif
+ifneq ($(origin VENDOR_CERT_FILE), undefined)
+ CFLAGS += -DVENDOR_CERT_FILE=\"$(VENDOR_CERT_FILE)\"
+endif
+
LDFLAGS = -nostdlib -znocombreloc -T $(EFI_LDS) -shared -Bsymbolic -L$(EFI_PATH) -L$(LIB_PATH) -LCryptlib -LCryptlib/OpenSSL $(EFI_CRT_OBJS)
-TARGET = shim.efi
-OBJS = shim.o shim.so
-SOURCES = shim.c shim.h signature.h PeImage.h cert.h
+TARGET = shim.efi
+OBJS = shim.o cert.o
+SOURCES = shim.c shim.h signature.h PeImage.h
all: $(TARGET)
shim.o: $(SOURCES)
-shim.so: $(OBJS) Cryptlib/libcryptlib.a Cryptlib/OpenSSL/libopenssl.a
+cert.o : cert.S
+ $(CC) $(CFLAGS) -c -o $@ $<
+
+shim.so: $(OBJS) Cryptlib/libcryptlib.a Cryptlib/OpenSSL/libopenssl.a cert.o
$(LD) -o $@ $(LDFLAGS) $^ $(EFI_LIBS)
Cryptlib/libcryptlib.a:
diff --git a/cert.S b/cert.S
new file mode 100644
index 0000000..129bab5
--- /dev/null
+++ b/cert.S
@@ -0,0 +1,32 @@
+#if defined(VENDOR_CERT_FILE)
+ .globl vendor_cert
+ .data
+ .align 16
+ .type vendor_cert, @object
+ .size vendor_cert_size, vendor_cert_size-vendor_cert
+vendor_cert:
+.incbin VENDOR_CERT_FILE
+
+ .globl vendor_cert_size
+ .data
+ .align 16
+ .type vendor_cert_size, @object
+ .size vendor_cert_size, 4
+vendor_cert_size:
+ .long vendor_cert_size - vendor_cert
+#else
+ .globl vendor_cert
+ .bss
+ .type vendor_cert, @object
+ .size vendor_cert, 1
+vendor_cert:
+ .zero 1
+
+ .globl vendor_cert_size
+ .data
+ .align 4
+ .type vendor_cert_size, @object
+ .size vendor_cert_size, 4
+vendor_cert_size:
+ .long 1
+#endif
diff --git a/cert.h b/cert.h
deleted file mode 100644
index 380bc04..0000000
--- a/cert.h
+++ /dev/null
@@ -1 +0,0 @@
-static UINT8 vendor_cert[] = {0x00};
diff --git a/shim.c b/shim.c
index fc3dafc..2d9044d 100644
--- a/shim.c
+++ b/shim.c
@@ -48,8 +48,8 @@ static EFI_STATUS (EFIAPI *entry_point) (EFI_HANDLE image_handle, EFI_SYSTEM_TAB
/*
* The vendor certificate used for validating the second stage loader
*/
-
-#include "cert.h"
+extern UINT8 vendor_cert[];
+extern UINT32 vendor_cert_size;
#define EFI_IMAGE_SECURITY_DATABASE_GUID { 0xd719b2cb, 0x3d3a, 0x4596, { 0xa3, 0xbc, 0xda, 0xd0, 0x0e, 0x67, 0x65, 0x6f }}
@@ -535,7 +535,7 @@ static EFI_STATUS verify_buffer (char *data, int datasize,
if (!AuthenticodeVerify(cert->CertData,
context->SecDir->Size - sizeof(cert->Hdr),
- vendor_cert, sizeof(vendor_cert), hash,
+ vendor_cert, vendor_cert_size, hash,
SHA256_DIGEST_SIZE)) {
Print(L"Invalid signature\n");
status = EFI_ACCESS_DENIED;
--
1.7.11.2