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heads/patches/coreboot-4.5.patch

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diff --git a/src/Kconfig b/src/Kconfig
index 91b27ce..2e9beb9 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -365,6 +365,21 @@ config BOOTSPLASH_FILE
The path and filename of the file to use as graphical bootsplash
screen. The file format has to be jpg.
+config MEASURED_BOOT
+ bool "Enable TPM measured boot"
+ default n
+ select TPM
+ depends on MAINBOARD_HAS_LPC_TPM
+ depends on !VBOOT
+ help
+ Enable this option to measure the bootblock, romstage and
+ CBFS files into TPM PCRs. This does not verify these values
+ (that is the job of something like vboot), but makes it possible
+ for the payload to validate the boot path and allow something
+ like Heads to attest to the user that the system is likely safe.
+
+ You probably want to say N.
+
endmenu
menu "Mainboard"
diff --git a/src/include/sha1.h b/src/include/sha1.h
new file mode 100644
index 0000000..e7e28e6
--- /dev/null
+++ b/src/include/sha1.h
@@ -0,0 +1,31 @@
+/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* SHA-1 functions */
+
+#ifndef _sha1_h_
+#define _sha1_h_
+
+#include <stdint.h>
+#include <commonlib/helpers.h>
+
+#define SHA1_DIGEST_SIZE 20
+#define SHA1_BLOCK_SIZE 64
+
+/* SHA-1 context */
+struct sha1_ctx {
+ uint32_t count;
+ uint32_t state[5];
+ union {
+ uint8_t b[SHA1_BLOCK_SIZE];
+ uint32_t w[DIV_ROUND_UP(SHA1_BLOCK_SIZE, sizeof(uint32_t))];
+ } buf;
+};
+
+void sha1_init(struct sha1_ctx *ctx);
+void sha1_update(struct sha1_ctx *ctx, const uint8_t *data, uint32_t len);
+uint8_t *sha1_final(struct sha1_ctx *ctx);
+
+#endif /* _sha1_h_ */
diff --git a/src/include/tpm_lite/tlcl.h b/src/include/tpm_lite/tlcl.h
index 8ea5564..c600d78 100644
--- a/src/include/tpm_lite/tlcl.h
+++ b/src/include/tpm_lite/tlcl.h
@@ -147,6 +147,11 @@ uint32_t tlcl_extend(int pcr_num, const uint8_t *in_digest,
uint8_t *out_digest);
/**
+ * Perform a SHA1 hash on a region and extend a PCR with the hash.
+ */
+uint32_t tlcl_measure(int pcr_num, const void * start, size_t len);
+
+/**
* Get the entire set of permanent flags.
*/
uint32_t tlcl_get_permanent_flags(TPM_PERMANENT_FLAGS *pflags);
diff --git a/src/lib/Makefile.inc b/src/lib/Makefile.inc
index 67f8364..20b359a 100644
--- a/src/lib/Makefile.inc
+++ b/src/lib/Makefile.inc
@@ -56,7 +56,14 @@ else
libverstage-$(CONFIG_TPM) += tlcl.c
libverstage-$(CONFIG_TPM2) += tpm2_marshaling.c
libverstage-$(CONFIG_TPM2) += tpm2_tlcl.c
+
+# Add the TPM support into the ROM stage for measuring the bootblock
+romstage-$(CONFIG_TPM) += tlcl.c
+romstage-$(CONFIG_TPM) += sha1.c
+ramstage-$(CONFIG_TPM) += tlcl.c
+ramstage-$(CONFIG_TPM) += sha1.c
endif
+$(info yes)
verstage-$(CONFIG_GENERIC_UDELAY) += timer.c
verstage-$(CONFIG_GENERIC_GPIO_LIB) += gpio.c
diff --git a/src/lib/cbfs.c b/src/lib/cbfs.c
index 5a2f63f..c5b145d 100644
--- a/src/lib/cbfs.c
+++ b/src/lib/cbfs.c
@@ -69,9 +69,15 @@ void *cbfs_boot_map_with_leak(const char *name, uint32_t type, size_t *size)
if (size != NULL)
*size = fsize;
- return rdev_mmap(&fh.data, 0, fsize);
+ void * buffer = rdev_mmap(&fh.data, 0, fsize);
+
+ prog_segment_loaded((uintptr_t)buffer, fsize, SEG_FINAL);
+
+ return buffer;
}
+
+
size_t cbfs_load_and_decompress(const struct region_device *rdev, size_t offset,
size_t in_size, void *buffer, size_t buffer_size, uint32_t compression)
{
@@ -83,7 +89,8 @@ size_t cbfs_load_and_decompress(const struct region_device *rdev, size_t offset,
return 0;
if (rdev_readat(rdev, buffer, offset, in_size) != in_size)
return 0;
- return in_size;
+ out_size = in_size;
+ break;
case CBFS_COMPRESS_LZ4:
if ((ENV_BOOTBLOCK || ENV_VERSTAGE) &&
@@ -101,7 +108,7 @@ size_t cbfs_load_and_decompress(const struct region_device *rdev, size_t offset,
timestamp_add_now(TS_START_ULZ4F);
out_size = ulz4fn(compr_start, in_size, buffer, buffer_size);
timestamp_add_now(TS_END_ULZ4F);
- return out_size;
+ break;
case CBFS_COMPRESS_LZMA:
if (ENV_BOOTBLOCK || ENV_VERSTAGE)
@@ -120,11 +127,15 @@ size_t cbfs_load_and_decompress(const struct region_device *rdev, size_t offset,
rdev_munmap(rdev, map);
- return out_size;
+ break;
default:
return 0;
}
+
+ prog_segment_loaded((uintptr_t)buffer, out_size, SEG_FINAL);
+
+ return out_size;
}
static inline int tohex4(unsigned int c)
diff --git a/src/lib/hardwaremain.c b/src/lib/hardwaremain.c
index ab4d9f4..01d83cb 100644
--- a/src/lib/hardwaremain.c
+++ b/src/lib/hardwaremain.c
@@ -31,6 +31,7 @@
#include <reset.h>
#include <boot/tables.h>
#include <program_loading.h>
+#include <tpm_lite/tlcl.h>
#include <lib.h>
#if CONFIG_HAVE_ACPI_RESUME
#include <arch/acpi.h>
@@ -526,3 +527,13 @@ void boot_state_current_unblock(void)
{
boot_state_unblock(current_phase.state_id, current_phase.seq);
}
+
+// ramstage measurements go into PCR3 if we are doing measured boot
+void platform_segment_loaded(uintptr_t start, size_t size, int flags)
+{
+ if (IS_ENABLED(CONFIG_MEASURED_BOOT))
+ {
+ tlcl_measure(3, (const void*) start, size);
+ }
+}
+
diff --git a/src/lib/rmodule.c b/src/lib/rmodule.c
index 7043157..e3c6ef5 100644
--- a/src/lib/rmodule.c
+++ b/src/lib/rmodule.c
@@ -125,10 +125,21 @@ static inline size_t rmodule_number_relocations(const struct rmodule *module)
static void rmodule_copy_payload(const struct rmodule *module)
{
- printk(BIOS_DEBUG, "Loading module at %p with entry %p. "
- "filesize: 0x%x memsize: 0x%x\n",
- module->location, rmodule_entry(module),
- module->payload_size, rmodule_memory_size(module));
+ const size_t mem_size = rmodule_memory_size(module);
+
+ printk(BIOS_DEBUG, "Loading module at %p/%p with entry %p. "
+ "filesize: 0x%x memsize: 0x%zx\n",
+ module->location, module->payload, rmodule_entry(module),
+ module->payload_size, mem_size);
+
+ // zero the excess memory if there is any
+ if (mem_size > module->payload_size)
+ {
+ memset((uint8_t*) module->location + module->payload_size,
+ 0,
+ mem_size - module->payload_size
+ );
+ }
/* No need to copy the payload if the load location and the
* payload location are the same. */
@@ -162,7 +173,8 @@ static int rmodule_relocate(const struct rmodule *module)
printk(PK_ADJ_LEVEL, "Adjusting %p: 0x%08lx -> 0x%08lx\n",
adjust_loc, (unsigned long) *adjust_loc,
(unsigned long) (*adjust_loc + adjustment));
- *adjust_loc += adjustment;
+
+ *adjust_loc += adjustment;
reloc++;
num_relocations--;
diff --git a/src/lib/sha1.c b/src/lib/sha1.c
new file mode 100644
index 0000000..506907f
--- /dev/null
+++ b/src/lib/sha1.c
@@ -0,0 +1,175 @@
+/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * SHA-1 implementation largely based on libmincrypt in the the Android
+ * Open Source Project (platorm/system/core.git/libmincrypt/sha.c
+ */
+
+#include "sha1.h"
+#include <string.h>
+
+static uint32_t ror27(uint32_t val)
+{
+ return (val >> 27) | (val << 5);
+}
+static uint32_t ror2(uint32_t val)
+{
+ return (val >> 2) | (val << 30);
+}
+static uint32_t ror31(uint32_t val)
+{
+ return (val >> 31) | (val << 1);
+}
+
+static void sha1_transform(struct sha1_ctx *ctx)
+{
+ uint32_t W[80];
+ register uint32_t A, B, C, D, E;
+ int t;
+
+ A = ctx->state[0];
+ B = ctx->state[1];
+ C = ctx->state[2];
+ D = ctx->state[3];
+ E = ctx->state[4];
+
+#define SHA_F1(A, B, C, D, E, t) \
+ E += ror27(A) + \
+ (W[t] = __builtin_bswap32(ctx->buf.w[t])) + \
+ (D^(B&(C^D))) + 0x5A827999; \
+ B = ror2(B);
+
+ for (t = 0; t < 15; t += 5) {
+ SHA_F1(A, B, C, D, E, t + 0);
+ SHA_F1(E, A, B, C, D, t + 1);
+ SHA_F1(D, E, A, B, C, t + 2);
+ SHA_F1(C, D, E, A, B, t + 3);
+ SHA_F1(B, C, D, E, A, t + 4);
+ }
+ SHA_F1(A, B, C, D, E, t + 0); /* 16th one, t == 15 */
+
+#undef SHA_F1
+
+#define SHA_F1(A, B, C, D, E, t) \
+ E += ror27(A) + \
+ (W[t] = ror31(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16])) + \
+ (D^(B&(C^D))) + 0x5A827999; \
+ B = ror2(B);
+
+ SHA_F1(E, A, B, C, D, t + 1);
+ SHA_F1(D, E, A, B, C, t + 2);
+ SHA_F1(C, D, E, A, B, t + 3);
+ SHA_F1(B, C, D, E, A, t + 4);
+
+#undef SHA_F1
+
+#define SHA_F2(A, B, C, D, E, t) \
+ E += ror27(A) + \
+ (W[t] = ror31(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16])) + \
+ (B^C^D) + 0x6ED9EBA1; \
+ B = ror2(B);
+
+ for (t = 20; t < 40; t += 5) {
+ SHA_F2(A, B, C, D, E, t + 0);
+ SHA_F2(E, A, B, C, D, t + 1);
+ SHA_F2(D, E, A, B, C, t + 2);
+ SHA_F2(C, D, E, A, B, t + 3);
+ SHA_F2(B, C, D, E, A, t + 4);
+ }
+
+#undef SHA_F2
+
+#define SHA_F3(A, B, C, D, E, t) \
+ E += ror27(A) + \
+ (W[t] = ror31(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16])) + \
+ ((B&C)|(D&(B|C))) + 0x8F1BBCDC; \
+ B = ror2(B);
+
+ for (; t < 60; t += 5) {
+ SHA_F3(A, B, C, D, E, t + 0);
+ SHA_F3(E, A, B, C, D, t + 1);
+ SHA_F3(D, E, A, B, C, t + 2);
+ SHA_F3(C, D, E, A, B, t + 3);
+ SHA_F3(B, C, D, E, A, t + 4);
+ }
+
+#undef SHA_F3
+
+#define SHA_F4(A, B, C, D, E, t) \
+ E += ror27(A) + \
+ (W[t] = ror31(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16])) + \
+ (B^C^D) + 0xCA62C1D6; \
+ B = ror2(B);
+
+ for (; t < 80; t += 5) {
+ SHA_F4(A, B, C, D, E, t + 0);
+ SHA_F4(E, A, B, C, D, t + 1);
+ SHA_F4(D, E, A, B, C, t + 2);
+ SHA_F4(C, D, E, A, B, t + 3);
+ SHA_F4(B, C, D, E, A, t + 4);
+ }
+
+#undef SHA_F4
+
+ ctx->state[0] += A;
+ ctx->state[1] += B;
+ ctx->state[2] += C;
+ ctx->state[3] += D;
+ ctx->state[4] += E;
+}
+
+void sha1_update(struct sha1_ctx *ctx, const uint8_t *data, uint32_t len)
+{
+ int i = ctx->count % sizeof(ctx->buf);
+ const uint8_t *p = (const uint8_t *)data;
+
+ ctx->count += len;
+
+ while (len > sizeof(ctx->buf) - i) {
+ memcpy(&ctx->buf.b[i], p, sizeof(ctx->buf) - i);
+ len -= sizeof(ctx->buf) - i;
+ p += sizeof(ctx->buf) - i;
+ sha1_transform(ctx);
+ i = 0;
+ }
+
+ while (len--) {
+ ctx->buf.b[i++] = *p++;
+ if (i == sizeof(ctx->buf)) {
+ sha1_transform(ctx);
+ i = 0;
+ }
+ }
+}
+
+
+uint8_t *sha1_final(struct sha1_ctx *ctx)
+{
+ uint32_t cnt = ctx->count * 8;
+ int i;
+
+ sha1_update(ctx, (uint8_t *)"\x80", 1);
+ while ((ctx->count % sizeof(ctx->buf)) != (sizeof(ctx->buf) - 8))
+ sha1_update(ctx, (uint8_t *)"\0", 1);
+
+ for (i = 0; i < 8; ++i) {
+ uint8_t tmp = cnt >> ((7 - i) * 8);
+ sha1_update(ctx, &tmp, 1);
+ }
+
+ for (i = 0; i < 5; i++)
+ ctx->buf.w[i] = __builtin_bswap32(ctx->state[i]);
+
+ return ctx->buf.b;
+}
+
+void sha1_init(struct sha1_ctx *ctx)
+{
+ ctx->state[0] = 0x67452301;
+ ctx->state[1] = 0xEFCDAB89;
+ ctx->state[2] = 0x98BADCFE;
+ ctx->state[3] = 0x10325476;
+ ctx->state[4] = 0xC3D2E1F0;
+ ctx->count = 0;
+}
diff --git a/src/lib/tlcl.c b/src/lib/tlcl.c
index ccf4e80..fe78b70 100644
--- a/src/lib/tlcl.c
+++ b/src/lib/tlcl.c
@@ -18,6 +18,7 @@
#include <string.h>
#include <tpm_lite/tlcl.h>
#include <tpm.h>
+#include <sha1.h>
#include <vb2_api.h>
#include "tlcl_internal.h"
#include "tlcl_structures.h"
@@ -325,3 +326,23 @@ uint32_t tlcl_extend(int pcr_num, const uint8_t* in_digest,
kPcrDigestLength);
return result;
}
+
+
+uint32_t tlcl_measure(int pcr_num, const void * start, size_t len)
+{
+ VBDEBUG("TPM: pcr %d measure %p @ %zu: ", pcr_num, start, len);
+
+ struct sha1_ctx sha;
+ sha1_init(&sha);
+ sha1_update(&sha, start, len);
+
+ const uint8_t * hash = sha1_final(&sha);
+ for(unsigned i = 0 ; i < SHA1_DIGEST_SIZE ; i++)
+ VBDEBUG("%02x", hash[i]);
+ VBDEBUG("\n");
+
+ //hexdump(start, 128);
+
+ return tlcl_extend(pcr_num, hash, NULL);
+}
+
diff --git a/src/northbridge/intel/sandybridge/romstage.c b/src/northbridge/intel/sandybridge/romstage.c
index a2ca1c1..df80286 100644
--- a/src/northbridge/intel/sandybridge/romstage.c
+++ b/src/northbridge/intel/sandybridge/romstage.c
@@ -29,6 +29,8 @@
#include <device/device.h>
#include <halt.h>
#include <tpm.h>
+#include <tpm_lite/tlcl.h>
+#include <program_loading.h>
#include <northbridge/intel/sandybridge/chip.h>
#include "southbridge/intel/bd82x6x/pch.h"
#include <southbridge/intel/common/gpio.h>
@@ -72,6 +74,18 @@ void mainboard_romstage_entry(unsigned long bist)
/* Initialize superio */
mainboard_config_superio();
+ if (IS_ENABLED(CONFIG_MEASURED_BOOT) && IS_ENABLED(CONFIG_LPC_TPM)) {
+ // we don't know if we are coming out of a resume
+ // at this point, but want to setup the tpm ASAP
+ init_tpm(0);
+ const void * const bootblock = (const void*) 0xFFFFF800;
+ const unsigned bootblock_size = 0x800;
+ tlcl_measure(0, bootblock, bootblock_size);
+
+ extern char _romstage, _eromstage;
+ tlcl_measure(1, &_romstage, &_eromstage - &_romstage);
+ }
+
/* USB is inited in MRC if MRC is used. */
if (CONFIG_USE_NATIVE_RAMINIT) {
early_usb_init(mainboard_usb_ports);
@@ -116,9 +130,23 @@ void mainboard_romstage_entry(unsigned long bist)
northbridge_romstage_finalize(s3resume);
- if (IS_ENABLED(CONFIG_LPC_TPM)) {
+ // the normal TPM init happens here, if we haven't already
+ // set it up as part of the measured boot.
+ if (!IS_ENABLED(CONFIG_MEASURED_BOOT) && IS_ENABLED(CONFIG_LPC_TPM)) {
init_tpm(s3resume);
}
+ printk(BIOS_DEBUG, "%s: romstage complete\n", __FILE__);
+
post_code(0x3f);
}
+
+
+void platform_segment_loaded(uintptr_t start, size_t size, int flags)
+{
+ if (IS_ENABLED(CONFIG_MEASURED_BOOT))
+ {
+ tlcl_measure(2, (const void*) start, size);
+ }
+}
+
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