[cc_fuzz] Export DSO symbols to /symbols/data/

cc_fuzz reexports transient dependeny DSO's to /data/fuzz through Make.
We intentionally export the non-stripped variants so that ClusterFuzz
can use the symbolized variant, but we don't re-export to
/symbols/data/fuzz. This means that tools like `stack` and
`hwasan_symbolize` can't pick up the symbols and don't know what to do.

Fix this by re-exporting to /symbols/ as well.

Bug: N/A
Test: make example_fuzzer && ls
$ANDROID_PRODUCT_OUT/symbols/data/fuzz/arm64/lib

Change-Id: Id0343c95a0a83e16e6f67f29ff6361fb4d757c05

cc/fuzz.go

@@ -198,6 +198,11 @@ func sharedLibraryInstallLocation(
 	return installLocation
 }
 
+// Get the device-only shared library symbols install directory.
+func sharedLibrarySymbolsInstallLocation(libraryPath android.Path, archString string) string {
+	return filepath.Join("$(PRODUCT_OUT)/symbols/data/fuzz/", archString, "/lib/", libraryPath.Base())
+}
+
 func (fuzz *fuzzBinary) install(ctx ModuleContext, file android.Path) {
 	fuzz.binaryDecorator.baseInstaller.dir = filepath.Join(
 		"fuzz", ctx.Target().Arch.ArchType.String(), ctx.ModuleName())
@@ -269,6 +274,12 @@ func (fuzz *fuzzBinary) install(ctx ModuleContext, file android.Path) {
 		fuzz.installedSharedDeps = append(fuzz.installedSharedDeps,
 			sharedLibraryInstallLocation(
 				lib, ctx.Host(), ctx.Arch().ArchType.String()))
+
+		// Also add the dependency on the shared library symbols dir.
+		if !ctx.Host() {
+			fuzz.installedSharedDeps = append(fuzz.installedSharedDeps,
+				sharedLibrarySymbolsInstallLocation(lib, ctx.Arch().ArchType.String()))
+		}
 	}
 }
 
@@ -421,12 +432,24 @@ func (s *fuzzPackager) GenerateBuildActions(ctx android.SingletonContext) {
 				continue
 			}
 			sharedLibraryInstalled[installDestination] = true
+
 			// Escape all the variables, as the install destination here will be called
 			// via. $(eval) in Make.
 			installDestination = strings.ReplaceAll(
 				installDestination, "$", "$$")
 			s.sharedLibInstallStrings = append(s.sharedLibInstallStrings,
 				library.String()+":"+installDestination)
+
+			// Ensure that on device, the library is also reinstalled to the /symbols/
+			// dir. Symbolized DSO's are always installed to the device when fuzzing, but
+			// we want symbolization tools (like `stack`) to be able to find the symbols
+			// in $ANDROID_PRODUCT_OUT/symbols automagically.
+			if !ccModule.Host() {
+				symbolsInstallDestination := sharedLibrarySymbolsInstallLocation(library, archString)
+				symbolsInstallDestination = strings.ReplaceAll(symbolsInstallDestination, "$", "$$")
+				s.sharedLibInstallStrings = append(s.sharedLibInstallStrings,
+					library.String()+":"+symbolsInstallDestination)
+			}
 		}
 
 		// The executable.