vboot: do not use cparams for VBSD

Pass VbSharedDataHeader struct directly as an argument for the
functions VbVerifyMemoryBootImage and VbSelectAndLoadKernel,
instead of retrieving from cparams.  After any remaining
references are removed from depthcharge, the VbCommonParams
struct may be deprecated and removed.

BUG=b:124141368
TEST=make clean && make runtests
BRANCH=none

Change-Id: I4dceb539516b62b5817987359705bb8e27ddb6f3
Signed-off-by: Joel Kitching <kitching@google.com>
Cq-Depend: chromium:1585505
Reviewed-on: https://chromium-review.googlesource.com/1584489
Commit-Ready: Joel Kitching <kitching@chromium.org>
Tested-by: Joel Kitching <kitching@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Joel Kitching <kitching@chromium.org>

3 files changed, 19 insertions, 30 deletions

diff --git a/firmware/include/vboot_api.h b/firmware/include/vboot_api.h
index 38c5cbda..84b9d11c 100644
--- a/firmware/include/vboot_api.h
+++ b/firmware/include/vboot_api.h
@@ -31,6 +31,7 @@ extern "C" {
 #endif  /* __cplusplus */
 
 struct vb2_context;
+typedef struct VbSharedDataHeader VbSharedDataHeader;
 
 /*****************************************************************************/
 /* Error codes */
@@ -321,7 +322,7 @@ typedef struct VbSelectAndLoadKernelParams {
  * Returns VBERROR_SUCCESS if success, non-zero if error; on error, caller
  * should reboot. */
 VbError_t VbSelectAndLoadKernel(struct vb2_context *ctx,
-				VbCommonParams *cparams,
+				VbSharedDataHeader *shared,
 				VbSelectAndLoadKernelParams *kparams);
 
 /**
@@ -334,15 +335,14 @@ VbError_t VbSelectAndLoadKernel(struct vb2_context *ctx,
  * does not check the image signature.
  *
  * @param ctx		Vboot context
- * @param cparams	Common parameters, e.g. use member caller_context
- *			to point to useful context data
+ * @param shared 	Vboot1 VBSD struct
  * @param kparams	kernel params
  * @param boot_image	Image in memory that needs to be verified
  * @param image_size	Size of the image in memory
  * @return VBERROR_... error, VBERROR_SUCCESS on success.
  */
 VbError_t VbVerifyMemoryBootImage(struct vb2_context *ctx,
-				  VbCommonParams *cparams,
+				  VbSharedDataHeader *shared,
 				  VbSelectAndLoadKernelParams *kparams,
 				  void *boot_image,
 				  size_t image_size);
diff --git a/firmware/lib/vboot_api_kernel.c b/firmware/lib/vboot_api_kernel.c
index 5d4c7c09..d5dda055 100644
--- a/firmware/lib/vboot_api_kernel.c
+++ b/firmware/lib/vboot_api_kernel.c
@@ -220,7 +220,7 @@ VbError_t VbBootNormal(struct vb2_context *ctx)
 }
 
 static VbError_t vb2_kernel_setup(struct vb2_context *ctx,
-				  VbCommonParams *cparams,
+				  VbSharedDataHeader *shared,
 				  VbSelectAndLoadKernelParams *kparams)
 {
 	if (VB2_SUCCESS != vb2_init_context(ctx)) {
@@ -229,9 +229,6 @@ static VbError_t vb2_kernel_setup(struct vb2_context *ctx,
 		return VBERROR_INIT_SHARED_DATA;
 	}
 
-	VbSharedDataHeader *shared =
-		(VbSharedDataHeader *)cparams->shared_data_blob;
-
 	/* Start timer */
 	shared->timer_vb_select_and_load_kernel_enter = VbExGetTimer();
 
@@ -347,31 +344,24 @@ static VbError_t vb2_kernel_phase4(struct vb2_context *ctx,
 	return VBERROR_SUCCESS;
 }
 
-static void vb2_kernel_cleanup(struct vb2_context *ctx, VbCommonParams *cparams)
+static void vb2_kernel_cleanup(struct vb2_context *ctx)
 {
-	/*
-	 * This must directly access cparams for now because we could have had
-	 * an error setting up the vboot2 context.  In that case
-	 * vb2_shared_data is not available.
-	 */
-	VbSharedDataHeader *shared =
-		(VbSharedDataHeader *)cparams->shared_data_blob;
-
 	vb2_nv_commit(ctx);
 
-	/* Stop timer */
-	shared->timer_vb_select_and_load_kernel_exit = VbExGetTimer();
-
-	/* Store how much shared data we used, if any */
-	cparams->shared_data_size = shared->data_used;
+	/* vb2_shared_data may not have been initialized, and we may not have a
+	   proper vbsd value. */
+	struct vb2_shared_data *sd = vb2_get_sd(ctx);
+	if (sd->vbsd)
+		/* Stop timer */
+		sd->vbsd->timer_vb_select_and_load_kernel_exit = VbExGetTimer();
 }
 
 VbError_t VbSelectAndLoadKernel(
 	struct vb2_context *ctx,
-	VbCommonParams *cparams,
+	VbSharedDataHeader *shared,
 	VbSelectAndLoadKernelParams *kparams)
 {
-	VbError_t retval = vb2_kernel_setup(ctx, cparams, kparams);
+	VbError_t retval = vb2_kernel_setup(ctx, shared, kparams);
 	if (retval)
 		goto VbSelectAndLoadKernel_exit;
 
@@ -442,7 +432,7 @@ VbError_t VbSelectAndLoadKernel(
 	if (VBERROR_SUCCESS == retval)
 		retval = vb2_kernel_phase4(ctx, kparams);
 
-	vb2_kernel_cleanup(ctx, cparams);
+	vb2_kernel_cleanup(ctx);
 
 	/* Pass through return value from boot path */
 	VB2_DEBUG("Returning %d\n", (int)retval);
@@ -450,7 +440,7 @@ VbError_t VbSelectAndLoadKernel(
 }
 
 VbError_t VbVerifyMemoryBootImage(
-	struct vb2_context *ctx, VbCommonParams *cparams,
+	struct vb2_context *ctx, VbSharedDataHeader *shared,
 	VbSelectAndLoadKernelParams *kparams, void *boot_image,
 	size_t image_size)
 {
@@ -464,13 +454,11 @@ VbError_t VbVerifyMemoryBootImage(
 	uint32_t allow_fastboot_full_cap = 0;
 	struct vb2_workbuf wb;
 
-	VbError_t retval = vb2_kernel_setup(ctx, cparams, kparams);
+	VbError_t retval = vb2_kernel_setup(ctx, shared, kparams);
 	if (retval)
 		goto fail;
 
-	struct vb2_shared_data *sd = vb2_get_sd(ctx);
 	struct vb2_gbb_header *gbb = vb2_get_gbb(ctx);
-	VbSharedDataHeader *shared = sd->vbsd;
 
 	if ((boot_image == NULL) || (image_size == 0)) {
 		retval = VBERROR_INVALID_PARAMETER;
@@ -601,7 +589,7 @@ VbError_t VbVerifyMemoryBootImage(
 	retval = VBERROR_SUCCESS;
 
  fail:
-	vb2_kernel_cleanup(ctx, cparams);
+	vb2_kernel_cleanup(ctx);
 	if (NULL != kernel_subkey)
 		free(kernel_subkey);
 	return retval;
diff --git a/firmware/linktest/main.c b/firmware/linktest/main.c
index 29bd9702..95a5d0fc 100644
--- a/firmware/linktest/main.c
+++ b/firmware/linktest/main.c
@@ -55,6 +55,7 @@ int main(void)
 
 	/* vboot_api.h - entry points INTO vboot_reference */
 	VbSelectAndLoadKernel(0, 0, 0);
+	VbVerifyMemoryBootImage(0, 0, 0, 0, 0);
 
 	/* vboot_common.h */
 	OffsetOf(0, 0);