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https://github.com/Telecominfraproject/OpenCellular.git
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abf0550458
This makes it much simpler to keep track of what we're doing. vbutil_key can now wrap both .keyb and .pem keys. It figures out which is which by trying both and just using the one that works. vbutil_keyblock and vbutil_kernel now use .vbprivk files for signing. replace debug() with VBDEBUG(()) in host-side sources, too. rename PrivateKeyRead to PrivateKeyReadPem Add real PrivateKeyRead and PrivateKeyWrite for .vbprivk files. Review URL: http://codereview.chromium.org/2871033
136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Exports the kernel commandline from a given partition/image.
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*/
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#include <inttypes.h> /* For uint64_t */
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include "kernel_blob.h"
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#include "utility.h"
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#include "vboot_common.h"
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#include "vboot_struct.h"
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/* Print help and return error */
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static int PrintHelp(void) {
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puts("dump_kernel_config - Prints the kernel command line\n"
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"\n"
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"Usage: dump_kernel_config <image/blockdevice>\n"
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"\n"
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"");
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return 1;
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}
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static uint8_t* find_kernel_config(uint8_t* blob, uint64_t blob_size) {
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VbKeyBlockHeader* key_block;
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VbKernelPreambleHeader* preamble;
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struct linux_kernel_params *params;
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uint32_t now = 0;
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uint32_t offset = 0;
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/* Skip the key block */
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key_block = (VbKeyBlockHeader*)blob;
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now += key_block->key_block_size;
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if (now + blob > blob + blob_size) {
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error("key_block_size advances past the end of the blob\n");
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return NULL;
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}
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/* Open up the preamble */
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preamble = (VbKernelPreambleHeader*)(blob + now);
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now += preamble->preamble_size;
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if (now + blob > blob + blob_size) {
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error("preamble_size advances past the end of the blob\n");
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return NULL;
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}
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/* The parameters are packed before the bootloader and there is no specific
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* pointer to it so we just walk back by its allocated size. */
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offset = preamble->bootloader_address -
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(CROS_32BIT_ENTRY_ADDR + CROS_PARAMS_SIZE) + now;
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if (offset > blob_size) {
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error("params are outside of the memory blob: %x\n", offset);
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return NULL;
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}
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params = (struct linux_kernel_params *)(blob + offset);
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/* Grab the offset to the kernel command line using the supplied pointer. */
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offset = params->cmd_line_ptr - CROS_32BIT_ENTRY_ADDR + now;
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if (offset > blob_size) {
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error("cmdline is outside of the memory blob: %x\n", offset);
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return NULL;
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}
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return (uint8_t *)(blob + offset);
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}
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static void* MapFile(const char *filename, size_t *size) {
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FILE* f;
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uint8_t* buf;
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long file_size = 0;
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f = fopen(filename, "rb");
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if (!f) {
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VBDEBUG(("Unable to open file %s\n", filename));
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return NULL;
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}
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fseek(f, 0, SEEK_END);
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file_size = ftell(f);
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rewind(f);
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if (file_size <= 0) {
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fclose(f);
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return NULL;
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}
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*size = (size_t) file_size;
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/* Uses a host primitive as this is not meant for firmware use. */
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buf = mmap(NULL, *size, PROT_READ, MAP_PRIVATE, fileno(f), 0);
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if (buf == MAP_FAILED) {
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error("Failed to mmap the file %s\n", filename);
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fclose(f);
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return NULL;
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}
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fclose(f);
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return buf;
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}
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int main(int argc, char* argv[]) {
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uint8_t* blob;
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size_t blob_size;
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char* infile = argv[1];
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uint8_t *config = NULL;
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if (argc < 2)
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return PrintHelp();
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if (!infile || !*infile) {
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error("Must specify filename\n");
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return 1;
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}
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/* Map the kernel image blob. */
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blob = MapFile(infile, &blob_size);
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if (!blob) {
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error("Error reading input file\n");
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return 1;
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}
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config = find_kernel_config(blob, (uint64_t)blob_size);
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if (!config) {
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error("Error parsing input file\n");
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munmap(blob, blob_size);
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return 1;
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}
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printf("%.*s", CROS_CONFIG_SIZE, config);
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munmap(blob, blob_size);
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return 0;
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}
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