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Commit da2d6ee7 authored by Jiyong Park's avatar Jiyong Park
Browse files

Truncate vbmeta to 64KB 

libavb expects to be able to read the maximum vbmeta size, so we must
provide a partition which matches this or the read will fail.

Bug: 181923506
Test: m MicrodroidHostTestCases
libavb tries

Change-Id: Icc5b86ccd98e3ed9c4269e584f35dbfbdf1b0730
parent ff5cc064

filesystem/vbmeta.go

+10 −0
Original line number Diff line number Diff line
@@ -110,6 +110,9 @@ func (v *vbmeta) partitionName() string { 
	return proptools.StringDefault(v.properties.Partition_name, v.BaseModuleName())

}



// See external/avb/libavb/avb_slot_verify.c#VBMETA_MAX_SIZE

const vbmetaMaxSize = 64 * 1024



func (v *vbmeta) GenerateAndroidBuildActions(ctx android.ModuleContext) {

	extractedPublicKeys := v.extractPublicKeys(ctx)
@@ -172,6 +175,13 @@ func (v *vbmeta) GenerateAndroidBuildActions(ctx android.ModuleContext) { 
	}



	cmd.FlagWithOutput("--output ", v.output)



	// libavb expects to be able to read the maximum vbmeta size, so we must provide a partition

	// which matches this or the read will fail.

	builder.Command().Text("truncate").

		FlagWithArg("-s ", strconv.Itoa(vbmetaMaxSize)).

		Output(v.output)



	builder.Build("vbmeta", fmt.Sprintf("vbmeta %s", ctx.ModuleName()))



	v.installDir = android.PathForModuleInstall(ctx, "etc")