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vboot2: Scramble the GBB magic number

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Compiling in the GBB magic number as is causes any tools that search for the
number to fail. This patch allows firmware to embed XOR'ed signature.

TEST=Booted Nyan in normal mode. FAFT:firmware_DevMode passes.
BUG=none
BRANCH=none
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>

Change-Id: Id18905a9969af3db24151e7c51332d0e94405108
Reviewed-on: https://chromium-review.googlesource.com/205416
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Queue: Daisuke Nojiri <dnojiri@chromium.org>
Tested-by: Daisuke Nojiri <dnojiri@chromium.org>
This commit is contained in:
Daisuke Nojiri
2014-06-24 12:26:39 -07:00
committed by chrome-internal-fetch
parent 25c95d0774
commit fc17308c39
3 changed files with 28 additions and 5 deletions
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7
firmware/2lib/include/2struct.h
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@@ -301,9 +301,14 @@ struct vb2_shared_data {
/****************************************************************************/
/* Signature at start of the GBB */
/* Signature at start of the GBB
* Note that if you compile in the signature as is, you are likely to break any
* tools that search for the signature. */
#define VB2_GBB_SIGNATURE "$GBB"
#define VB2_GBB_SIGNATURE_SIZE 4
#define VB2_GBB_XOR_CHARS "****"
/* TODO: can we write a macro to produce this at compile time? */
#define VB2_GBB_XOR_SIGNATURE { 0x0e, 0x6d, 0x68, 0x68 }
/* VB2 GBB struct version */
#define VB2_GBB_MAJOR_VER 1