Allow --repack option to change kernel version number.
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
1 file changed