Create sanitizer variants of APEX only when SANITIZE_TARGET is set

This fixes a problem that APEX is unconditionally mutated for all
sanitizer types. This can make an APEX to include sanitized version
of a lib even when SANITIZE_TARGET is not set. It can happen when lib X
is directly depended on by an APEX (e.g. via native_shared_libs) and X
has a sanitized variant due to the dependency from another library Y
which is force sanitized (via 'sanitize' property). In that case,
regardless of lib Y is in the APEX or not, the APEX chooses the
sanitized variant of lib X since the dependency from APEX to the lib is
created with AddFarVariationDependency.

Fixing this problem by mutating the APEX for a sanitizer type only when
the device is requested to be sanitized.

Bug: 122717287
Test: add libnetd_client to com.android.runtime APEX.
Inspect build.ninja to verify that libnetd_client.so in the runtime APEX
is not a sanitized one.

Change-Id: I918bc8407137d74c5456142b3a29de13df68c0b3

1 files changed, 11 insertions, 3 deletions

diff --git a/apex/apex.go b/apex/apex.go
index 46c9dcf0..321e2e89 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -483,9 +483,17 @@ func (a *apexBundle) getImageVariation(config android.DeviceConfig) string {
 	}
 }
 
-func (a *apexBundle) IsSanitizerEnabled() bool {
-	// APEX can be mutated for sanitizers
-	return true
+func (a *apexBundle) IsSanitizerEnabled(ctx android.BaseModuleContext, sanitizerName string) bool {
+	globalSanitizerNames := []string{}
+	if a.Host() {
+		globalSanitizerNames = ctx.Config().SanitizeHost()
+	} else {
+		arches := ctx.Config().SanitizeDeviceArch()
+		if len(arches) == 0 || android.InList(a.Arch().ArchType.Name, arches) {
+			globalSanitizerNames = ctx.Config().SanitizeDevice()
+		}
+	}
+	return android.InList(sanitizerName, globalSanitizerNames)
 }
 
 func getCopyManifestForNativeLibrary(cc *cc.Module) (fileToCopy android.Path, dirInApex string) {