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Allow --repack option to change kernel version number.

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RFro TPM rollback testing we need to be able to change kernel
version number. This Cl adds this ability to the
vbutil_kernel utility.

Change-Id: I156df9b0d3467043c20a43e1c75e6d0222704f3a

BUG=chromium-os:1976
TEST=manual

1. On a target running off /dev/sda3 (as reported by
'rootdev -s') execute `/usr/bin/dev_debug_vboot' and take
note of the kernel version number in the output section
starting with 'TEST: verify HD kernel A with firmware A key',
under 'Preamble' it should read
'Kernel version:      1'

2. copy the kernel into a file:
dd if=/dev/sda2 of=/tmp/kernel

3.on the desktop (this step requires ssh setup to use the
correct keys to reach the target):

scp tests/devkeys/kernel_data_key.vbprivk <target>:/tmp

3. Modify kernel version
vbutil_kernel --repack /tmp/repacked.k --version 2 --signprivate /tmp/kernel_data_key.vbprivk  --oldblob  /tmp/kernel

4. Install the updated kernel
dd if=/tmp/repacked.k of=/dev/sda2

5. restart the system

6. Observe that it came up using /dev/sda3 as the root
file system

7. run /usr/bin/dev_debug_vboot and observe that the kernel
version is no set to 2

Review URL: http://codereview.chromium.org/3520019
This commit is contained in:
vbendeb
2010-10-06 09:51:44 -07:00
parent 468cf3a20c
commit 858fffb5ce
1 changed files with 9 additions and 4 deletions
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13
utility/vbutil_kernel.c
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@@ -91,13 +91,14 @@ static int PrintHelp(char *progname) {
"\nOR\n\n"
"Usage: %s --repack <file> [PARAMETERS]\n"
"\n"
" Required parameters (of --keyblock and --config at least "
"one is required):\n"
" Required parameters (of --keyblock, --config, and --version \n"
" at least one is required):\n"
" --keyblock <file> Key block in .keyblock format\n"
" --signprivate <file>"
" Private key to sign kernel data, in .vbprivk format\n"
" --oldblob <file> Previously packed kernel blob\n"
" --config <file> New command line file\n"
" --version <number> Kernel version\n"
"\n"
" Optional:\n"
" --pad <number> Verification padding size in bytes\n"
@@ -846,9 +847,10 @@ int main(int argc, char* argv[]) {
return r;
case OPT_MODE_REPACK:
if (!config_file && !key_block_file) {
if (!config_file && !key_block_file && !version) {
fprintf(stderr,
"You must supply at least one of --config and --keyblock\n");
"You must supply at least one of "
"--config, --keyblock or --version\n");
return 1;
}
@@ -857,6 +859,9 @@ int main(int argc, char* argv[]) {
return 1;
r = ReplaceConfig(bp, config_file);
if (!r) {
if (version) {
bp->kernel_version = version;
}
r = Pack(filename, key_block_file, signprivate, bp, pad, vblockonly);
}
FreeBlob(bp);