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vboot: Add flag to vbutil_kernel for reconstruction of vmlinuz image

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Adding functionality to allow for rebuilding of vmlinuz after it
has been processed into vblock and header stripped.  Basically appends
the 16-bit header of a vmlinuz image onto the end of the vblock.
BUG=chromium:438302
BRANCH=none
TEST=Successfully ran "make runalltests".
     Also, ran:
     1. Repack kernel block (so that 16-bit header is included):
        "vbutil_kernel --pack kern_0 ..."
     2. Verify kernel: "vbutil_kernel --verify kern_0 ... ".  This should
        be done before booting into kernel, but not necessary for it to work.
     3. Rebuild vmlinuz image:
        "vbutil_kernel --get-vmlinuz kern_0 --vmlinuz-out vm.out"
     4. Set up kexec with vmlinuz (this should complete with no errors):
        "kexec -l vm.out (other kernel cmd line args)"
     5. Boot into kernel:
        "kexec -e"

Change-Id: Iaa1582a1aedf70b43cdb3a56cde1fb248f1793d4
Signed-off-by: Shelley Chen <shchen@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/232750
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
This commit is contained in:
Shelley Chen
2015-01-08 09:13:44 -08:00
committed by ChromeOS Commit Bot
parent f242ad0f6f
commit f1f53b3732
11 changed files with 318 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
firmware/lib/include/vboot_common.h
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@@ -148,6 +148,25 @@ int VerifyKernelPreamble(const VbKernelPreambleHeader *preamble,
uint64_t size, const RSAPublicKey *key);
/**
* Retrieve the 16-bit vmlinuz header address and size from the kernel preamble
* if there is one. These are only available in Kernel Preamble Header version
* >= 2.1. If given a header 2.0 or lower, will set address and size to 0 (this
* is not considered an error).
*
* Returns VBOOT_SUCCESS if successful.
*/
int VbGetKernelVmlinuzHeader(const VbKernelPreambleHeader *preamble,
uint64_t *vmlinuz_header_address,
uint64_t *vmlinuz_header_size);
/**
* Verify that the Vmlinuz Header is contained inside of the kernel blob.
*
* Returns VBOOT_SUCCESS or VBOOT_PREAMBLE_INVALID on error
*/
int VerifyVmlinuzInsideKBlob(uint64_t kblob, uint64_t kblob_size,
uint64_t header, uint64_t header_size);
/**
* Initialize a verified boot shared data structure.
*