mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-25 22:20:45 +00:00
7e019daf7a
In rollback_space_kernel we were not initializing the reserved fields which should be for safety sake, and doing memset here means we don't need to set the version field specifically either. Reported-by: Coverity (CID: 143917) Cc: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Rini <trini@konsulko.com>
293 lines
7.2 KiB
C
293 lines
7.2 KiB
C
/*
|
|
* Copyright (c) 2013 Google, Inc
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <tpm.h>
|
|
#include <asm/state.h>
|
|
#include <asm/unaligned.h>
|
|
#include <linux/crc8.h>
|
|
|
|
/* TPM NVRAM location indices. */
|
|
#define FIRMWARE_NV_INDEX 0x1007
|
|
#define KERNEL_NV_INDEX 0x1008
|
|
|
|
#define NV_DATA_PUBLIC_PERMISSIONS_OFFSET 60
|
|
|
|
/* Kernel TPM space - KERNEL_NV_INDEX, locked with physical presence */
|
|
#define ROLLBACK_SPACE_KERNEL_VERSION 2
|
|
#define ROLLBACK_SPACE_KERNEL_UID 0x4752574C /* 'GRWL' */
|
|
|
|
struct rollback_space_kernel {
|
|
/* Struct version, for backwards compatibility */
|
|
uint8_t struct_version;
|
|
/* Unique ID to detect space redefinition */
|
|
uint32_t uid;
|
|
/* Kernel versions */
|
|
uint32_t kernel_versions;
|
|
/* Reserved for future expansion */
|
|
uint8_t reserved[3];
|
|
/* Checksum (v2 and later only) */
|
|
uint8_t crc8;
|
|
} __packed rollback_space_kernel;
|
|
|
|
/*
|
|
* These numbers derive from adding the sizes of command fields as shown in
|
|
* the TPM commands manual.
|
|
*/
|
|
#define TPM_REQUEST_HEADER_LENGTH 10
|
|
#define TPM_RESPONSE_HEADER_LENGTH 10
|
|
|
|
/* These are the different non-volatile spaces that we emulate */
|
|
enum {
|
|
NV_GLOBAL_LOCK,
|
|
NV_SEQ_FIRMWARE,
|
|
NV_SEQ_KERNEL,
|
|
NV_SEQ_COUNT,
|
|
};
|
|
|
|
/* Size of each non-volatile space */
|
|
#define NV_DATA_SIZE 0x20
|
|
|
|
/*
|
|
* Information about our TPM emulation. This is preserved in the sandbox
|
|
* state file if enabled.
|
|
*/
|
|
static struct tpm_state {
|
|
uint8_t nvdata[NV_SEQ_COUNT][NV_DATA_SIZE];
|
|
} g_state;
|
|
|
|
/**
|
|
* sandbox_tpm_read_state() - read the sandbox EC state from the state file
|
|
*
|
|
* If data is available, then blob and node will provide access to it. If
|
|
* not this function sets up an empty TPM.
|
|
*
|
|
* @blob: Pointer to device tree blob, or NULL if no data to read
|
|
* @node: Node offset to read from
|
|
*/
|
|
static int sandbox_tpm_read_state(const void *blob, int node)
|
|
{
|
|
const char *prop;
|
|
int len;
|
|
int i;
|
|
|
|
if (!blob)
|
|
return 0;
|
|
|
|
for (i = 0; i < NV_SEQ_COUNT; i++) {
|
|
char prop_name[20];
|
|
|
|
sprintf(prop_name, "nvdata%d", i);
|
|
prop = fdt_getprop(blob, node, prop_name, &len);
|
|
if (prop && len == NV_DATA_SIZE)
|
|
memcpy(g_state.nvdata[i], prop, NV_DATA_SIZE);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cros_ec_write_state() - Write out our state to the state file
|
|
*
|
|
* The caller will ensure that there is a node ready for the state. The node
|
|
* may already contain the old state, in which case it is overridden.
|
|
*
|
|
* @blob: Device tree blob holding state
|
|
* @node: Node to write our state into
|
|
*/
|
|
static int sandbox_tpm_write_state(void *blob, int node)
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* We are guaranteed enough space to write basic properties.
|
|
* We could use fdt_add_subnode() to put each set of data in its
|
|
* own node - perhaps useful if we add access informaiton to each.
|
|
*/
|
|
for (i = 0; i < NV_SEQ_COUNT; i++) {
|
|
char prop_name[20];
|
|
|
|
sprintf(prop_name, "nvdata%d", i);
|
|
fdt_setprop(blob, node, prop_name, g_state.nvdata[i],
|
|
NV_DATA_SIZE);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
SANDBOX_STATE_IO(sandbox_tpm, "google,sandbox-tpm", sandbox_tpm_read_state,
|
|
sandbox_tpm_write_state);
|
|
|
|
static int index_to_seq(uint32_t index)
|
|
{
|
|
switch (index) {
|
|
case FIRMWARE_NV_INDEX:
|
|
return NV_SEQ_FIRMWARE;
|
|
case KERNEL_NV_INDEX:
|
|
return NV_SEQ_KERNEL;
|
|
case 0:
|
|
return NV_GLOBAL_LOCK;
|
|
}
|
|
|
|
printf("Invalid nv index %#x\n", index);
|
|
return -1;
|
|
}
|
|
|
|
static int sandbox_tpm_xfer(struct udevice *dev, const uint8_t *sendbuf,
|
|
size_t send_size, uint8_t *recvbuf,
|
|
size_t *recv_len)
|
|
{
|
|
struct tpm_state *tpm = dev_get_priv(dev);
|
|
uint32_t code, index, length, type;
|
|
uint8_t *data;
|
|
int seq;
|
|
|
|
code = get_unaligned_be32(sendbuf + sizeof(uint16_t) +
|
|
sizeof(uint32_t));
|
|
printf("tpm: %zd bytes, recv_len %zd, cmd = %x\n", send_size,
|
|
*recv_len, code);
|
|
print_buffer(0, sendbuf, 1, send_size, 0);
|
|
switch (code) {
|
|
case 0x65: /* get flags */
|
|
type = get_unaligned_be32(sendbuf + 14);
|
|
switch (type) {
|
|
case 4:
|
|
index = get_unaligned_be32(sendbuf + 18);
|
|
printf("Get flags index %#02x\n", index);
|
|
*recv_len = 22;
|
|
memset(recvbuf, '\0', *recv_len);
|
|
put_unaligned_be32(22, recvbuf +
|
|
TPM_RESPONSE_HEADER_LENGTH);
|
|
data = recvbuf + TPM_RESPONSE_HEADER_LENGTH +
|
|
sizeof(uint32_t);
|
|
switch (index) {
|
|
case FIRMWARE_NV_INDEX:
|
|
break;
|
|
case KERNEL_NV_INDEX:
|
|
/* TPM_NV_PER_PPWRITE */
|
|
put_unaligned_be32(1, data +
|
|
NV_DATA_PUBLIC_PERMISSIONS_OFFSET);
|
|
break;
|
|
}
|
|
break;
|
|
case 0x11: /* TPM_CAP_NV_INDEX */
|
|
index = get_unaligned_be32(sendbuf + 18);
|
|
printf("Get cap nv index %#02x\n", index);
|
|
put_unaligned_be32(22, recvbuf +
|
|
TPM_RESPONSE_HEADER_LENGTH);
|
|
break;
|
|
default:
|
|
printf(" ** Unknown 0x65 command type %#02x\n",
|
|
type);
|
|
return -1;
|
|
}
|
|
break;
|
|
case 0xcd: /* nvwrite */
|
|
index = get_unaligned_be32(sendbuf + 10);
|
|
length = get_unaligned_be32(sendbuf + 18);
|
|
seq = index_to_seq(index);
|
|
if (seq < 0)
|
|
return -1;
|
|
printf("tpm: nvwrite index=%#02x, len=%#02x\n", index, length);
|
|
memcpy(&tpm->nvdata[seq], sendbuf + 22, length);
|
|
*recv_len = 12;
|
|
memset(recvbuf, '\0', *recv_len);
|
|
break;
|
|
case 0xcf: /* nvread */
|
|
index = get_unaligned_be32(sendbuf + 10);
|
|
length = get_unaligned_be32(sendbuf + 18);
|
|
seq = index_to_seq(index);
|
|
if (seq < 0)
|
|
return -1;
|
|
printf("tpm: nvread index=%#02x, len=%#02x\n", index, length);
|
|
*recv_len = TPM_RESPONSE_HEADER_LENGTH + sizeof(uint32_t) +
|
|
length;
|
|
memset(recvbuf, '\0', *recv_len);
|
|
put_unaligned_be32(length, recvbuf +
|
|
TPM_RESPONSE_HEADER_LENGTH);
|
|
if (seq == NV_SEQ_KERNEL) {
|
|
struct rollback_space_kernel rsk;
|
|
|
|
data = recvbuf + TPM_RESPONSE_HEADER_LENGTH +
|
|
sizeof(uint32_t);
|
|
memset(&rsk, 0, sizeof(struct rollback_space_kernel));
|
|
rsk.struct_version = 2;
|
|
rsk.uid = ROLLBACK_SPACE_KERNEL_UID;
|
|
rsk.crc8 = crc8(0, (unsigned char *)&rsk,
|
|
offsetof(struct rollback_space_kernel,
|
|
crc8));
|
|
memcpy(data, &rsk, sizeof(rsk));
|
|
} else {
|
|
memcpy(recvbuf + TPM_RESPONSE_HEADER_LENGTH +
|
|
sizeof(uint32_t), &tpm->nvdata[seq], length);
|
|
}
|
|
break;
|
|
case 0x14: /* tpm extend */
|
|
case 0x15: /* pcr read */
|
|
case 0x5d: /* force clear */
|
|
case 0x6f: /* physical enable */
|
|
case 0x72: /* physical set deactivated */
|
|
case 0x99: /* startup */
|
|
case 0x4000000a: /* assert physical presence */
|
|
*recv_len = 12;
|
|
memset(recvbuf, '\0', *recv_len);
|
|
break;
|
|
default:
|
|
printf("Unknown tpm command %02x\n", code);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sandbox_tpm_get_desc(struct udevice *dev, char *buf, int size)
|
|
{
|
|
if (size < 15)
|
|
return -ENOSPC;
|
|
|
|
return snprintf(buf, size, "sandbox TPM");
|
|
}
|
|
|
|
static int sandbox_tpm_probe(struct udevice *dev)
|
|
{
|
|
struct tpm_state *tpm = dev_get_priv(dev);
|
|
|
|
memcpy(tpm, &g_state, sizeof(*tpm));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sandbox_tpm_open(struct udevice *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int sandbox_tpm_close(struct udevice *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const struct tpm_ops sandbox_tpm_ops = {
|
|
.open = sandbox_tpm_open,
|
|
.close = sandbox_tpm_close,
|
|
.get_desc = sandbox_tpm_get_desc,
|
|
.xfer = sandbox_tpm_xfer,
|
|
};
|
|
|
|
static const struct udevice_id sandbox_tpm_ids[] = {
|
|
{ .compatible = "google,sandbox-tpm" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(sandbox_tpm) = {
|
|
.name = "sandbox_tpm",
|
|
.id = UCLASS_TPM,
|
|
.of_match = sandbox_tpm_ids,
|
|
.ops = &sandbox_tpm_ops,
|
|
.probe = sandbox_tpm_probe,
|
|
.priv_auto_alloc_size = sizeof(struct tpm_state),
|
|
};
|