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cbfstool: add unprocessed flag for file exporting 

Add an unprocessed flag (-U) which modifies how files are exported.
In the case of a compressed raw file, extract without decompressing.
In the case of a stage or payload, extract without decompressing or
converting to an ELF.

This can be useful for verifying the integrity of a stage or payload,
since converting to an ELF may not be a deterministic process on
different platforms or coreboot versions.

BUG=b:111577108
TEST=USE=cb_legacy_tianocore emerge-eve edk2 coreboot-utils chromeos-bootimage
     cd /build/eve/firmware
     /build/eve/usr/bin/cbfstool image.bin extract -r RW_LEGACY \
       -n payload -f /tmp/payload_1 -U
     START=$((16#`xxd -s 20 -l 4 -p tianocore.cbfs`))
     SIZE=$((16#`xxd -s 8 -l 4 -p tianocore.cbfs`))
     dd if=tianocore.cbfs skip=$START count=$SIZE bs=1 > /tmp/payload_2
     diff /tmp/payload_1 /tmp/payload_2
     rm /tmp/payload_1 /tmp/payload_2

Change-Id: I351d471d699daedd51adf4a860661877f25607e6
Signed-off-by: Joel Kitching <kitching@chromium.org>
Reviewed-on: https://review.coreboot.org/29616
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Joel Kitching 2018-08-09 17:49:52 +08:00 committed by Patrick Georgi
parent 73bbcee932
commit 21fdd89b0c
3 changed files with 47 additions and 23 deletions
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51
util/cbfstool/cbfs_image.c
View File

@ -1286,7 +1286,7 @@ out:
}
int cbfs_export_entry(struct cbfs_image *image, const char *entry_name,
const char *filename, uint32_t arch)
const char *filename, uint32_t arch, bool do_processing)
{
struct cbfs_file *entry = cbfs_get_entry(image, entry_name);
struct buffer buffer;
@ -1295,26 +1295,37 @@ int cbfs_export_entry(struct cbfs_image *image, const char *entry_name,
return -1;
}
unsigned int compressed_size = ntohl(entry->len);
unsigned int decompressed_size = 0;
unsigned int compression = cbfs_file_get_compression_info(entry,
&decompressed_size);
unsigned int buffer_size;
decomp_func_ptr decompress;
decomp_func_ptr decompress = decompression_function(compression);
if (!decompress) {
ERROR("looking up decompression routine failed\n");
return -1;
if (do_processing) {
decompress = decompression_function(compression);
if (!decompress) {
ERROR("looking up decompression routine failed\n");
return -1;
}
buffer_size = decompressed_size;
} else {
/* Force nop decompression */
decompress = decompression_function(CBFS_COMPRESS_NONE);
buffer_size = compressed_size;
}
LOG("Found file %.30s at 0x%x, type %.12s, size %d\n",
LOG("Found file %.30s at 0x%x, type %.12s, compressed %d, size %d\n",
entry_name, cbfs_get_entry_addr(image, entry),
get_cbfs_entry_type_name(ntohl(entry->type)), decompressed_size);
get_cbfs_entry_type_name(ntohl(entry->type)), compressed_size,
decompressed_size);
buffer_init(&buffer, strdup("(cbfs_export_entry)"), NULL, 0);
buffer.data = malloc(buffer_size);
buffer.size = buffer_size;
buffer.data = malloc(decompressed_size);
buffer.size = decompressed_size;
if (decompress(CBFS_SUBHEADER(entry), ntohl(entry->len),
buffer.data, buffer.size, NULL)) {
if (decompress(CBFS_SUBHEADER(entry), compressed_size,
buffer.data, buffer.size, NULL)) {
ERROR("decompression failed for %s\n", entry_name);
buffer_delete(&buffer);
return -1;
@ -1326,13 +1337,19 @@ int cbfs_export_entry(struct cbfs_image *image, const char *entry_name,
* one has to do a second pass for stages to potentially decompress
* the stage data to make it more meaningful.
*/
if (ntohl(entry->type) == CBFS_COMPONENT_STAGE) {
if (cbfs_stage_make_elf(&buffer, arch)) {
buffer_delete(&buffer);
return -1;
if (do_processing) {
int (*make_elf)(struct buffer *, uint32_t) = NULL;
switch (ntohl(entry->type)) {
case CBFS_COMPONENT_STAGE:
make_elf = cbfs_stage_make_elf;
break;
case CBFS_COMPONENT_SELF:
make_elf = cbfs_payload_make_elf;
break;
}
} else if (ntohl(entry->type) == CBFS_COMPONENT_SELF) {
if (cbfs_payload_make_elf(&buffer, arch)) {
if (make_elf && make_elf(&buffer, arch)) {
ERROR("Failed to write %s into %s.\n",
entry_name, filename);
buffer_delete(&buffer);
return -1;
}

5
util/cbfstool/cbfs_image.h
View File

@ -95,10 +95,11 @@ int cbfs_image_delete(struct cbfs_image *image);
/* Returns a pointer to entry by name, or NULL if name is not found. */
struct cbfs_file *cbfs_get_entry(struct cbfs_image *image, const char *name);
/* Exports an entry to external file.
/* Exports an entry to external file. If do_processing is true, file contents
* will be decompressed, and also turned into an ELF if appropriate.
* Returns 0 on success, otherwise (ex, not found) non-zero. */
int cbfs_export_entry(struct cbfs_image *image, const char *entry_name,
const char *filename, uint32_t arch);
const char *filename, uint32_t arch, bool do_processing);
/* Adds an entry to CBFS image by given name and type. If content_offset is
* non-zero, try to align "content" (CBFS_SUBHEADER(p)) at content_offset.

14
util/cbfstool/cbfstool.c
View File

@ -83,6 +83,7 @@ static struct param {
bool stage_xip;
bool autogen_attr;
bool machine_parseable;
bool unprocessed;
int fit_empty_entries;
enum comp_algo compression;
int precompression;
@ -1095,7 +1096,7 @@ static int cbfs_extract(void)
return 1;
return cbfs_export_entry(&image, param.name, param.filename,
param.arch);
param.arch, !param.unprocessed);
}
static int cbfs_write(void)
@ -1314,7 +1315,7 @@ static const struct command commands[] = {
{"compact", "r:h?", cbfs_compact, true, true},
{"copy", "r:R:h?", cbfs_copy, true, true},
{"create", "M:r:s:B:b:H:o:m:vh?", cbfs_create, true, true},
{"extract", "H:r:m:n:f:vh?", cbfs_extract, true, false},
{"extract", "H:r:m:n:f:Uvh?", cbfs_extract, true, false},
{"layout", "wvh?", cbfs_layout, false, false},
{"print", "H:r:vkh?", cbfs_print, true, false},
{"read", "r:f:vh?", cbfs_read, true, false},
@ -1362,6 +1363,7 @@ static struct option long_options[] = {
{"xip", no_argument, 0, 'y' },
{"gen-attribute", no_argument, 0, 'g' },
{"mach-parseable",no_argument, 0, 'k' },
{"unprocessed", no_argument, 0, 'U' },
{NULL, 0, 0, 0 }
};
@ -1428,6 +1430,7 @@ static void usage(char *name)
" -d Accept short data; fill downward/from top\n"
" -F Force action\n"
" -g Generate position and alignment arguments\n"
" -U Unprocessed; don't decompress or make ELF\n"
" -v Provide verbose output\n"
" -h Display this help message\n\n"
"COMMANDs:\n"
@ -1473,8 +1476,8 @@ static void usage(char *name)
"List mutable (or, with -w, readable) image regions\n"
" print [-r image,regions] "
"Show the contents of the ROM\n"
" extract [-r image,regions] [-m ARCH] -n NAME -f FILE "
"Extracts a raw payload from ROM\n"
" extract [-r image,regions] [-m ARCH] -n NAME -f FILE [-U] "
"Extracts a file from ROM\n"
" write [-F] -r image,regions -f file [-u | -d] [-i int] "
"Write file into same-size [or larger] raw region\n"
" read [-r fmap-region] -f file "
@ -1770,6 +1773,9 @@ int main(int argc, char **argv)
case 'k':
param.machine_parseable = true;
break;
case 'U':
param.unprocessed = true;
break;
case 'h':
case '?':
usage(argv[0]);