rust: Bundle Rust shared dependencies in fuzzers

Rust shared library dependencies are not always bundled in cc_fuzz or
rust_fuzz modules, which can lead to difficult to debug runtime errors
when running these fuzzers. It can also be hard to determine which
dependencies need to be explicitly declared.

This CL makes sure that we bundle the appropriate transitive
dependencies for our fuzzers.

Bug: 249551848
Test: Soong tests
Test: m <fuzzer> # check data/fuzz/<arch>/lib dir contents
Change-Id: I957ca8898079b61e2ff20d750f8c92bf61ac394f

5 files changed, 93 insertions, 0 deletions

diff --git a/cc/cc.go b/cc/cc.go
index c9f00e248..ddff2b03d 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -1076,6 +1076,10 @@ func (c *Module) CcLibraryInterface() bool {
 	return false
 }
 
+func (c *Module) RustLibraryInterface() bool {
+	return false
+}
+
 func (c *Module) IsFuzzModule() bool {
 	if _, ok := c.compiler.(*fuzzBinary); ok {
 		return true
diff --git a/cc/fuzz.go b/cc/fuzz.go
index c897501e8..636ad855b 100644
--- a/cc/fuzz.go
+++ b/cc/fuzz.go
@@ -535,6 +535,17 @@ func CollectAllSharedDependencies(ctx android.ModuleContext) (android.RuleBuilde
 	})
 
 	ctx.WalkDeps(func(child, parent android.Module) bool {
+
+		// If this is a Rust module which is not rust_ffi_shared, we still want to bundle any transitive
+		// shared dependencies (even for rust_ffi_static)
+		if rustmod, ok := child.(LinkableInterface); ok && rustmod.RustLibraryInterface() && !rustmod.Shared() {
+			if recursed[ctx.OtherModuleName(child)] {
+				return false
+			}
+			recursed[ctx.OtherModuleName(child)] = true
+			return true
+		}
+
 		if !IsValidSharedDependency(child) {
 			return false
 		}
diff --git a/cc/linkable.go b/cc/linkable.go
index 557f5d2b3..976a38201 100644
--- a/cc/linkable.go
+++ b/cc/linkable.go
@@ -100,6 +100,9 @@ type LinkableInterface interface {
 	CcLibrary() bool
 	CcLibraryInterface() bool
 
+	// RustLibraryInterface returns true if this is a Rust library module
+	RustLibraryInterface() bool
+
 	// BaseModuleName returns the android.ModuleBase.BaseModuleName() value for this module.
 	BaseModuleName() string
 
diff --git a/rust/fuzz_test.go b/rust/fuzz_test.go
index 7fa9f5c8f..0aecf617e 100644
--- a/rust/fuzz_test.go
+++ b/rust/fuzz_test.go
@@ -19,6 +19,7 @@ import (
 	"testing"
 
 	"android/soong/android"
+	"android/soong/cc"
 )
 
 func TestRustFuzz(t *testing.T) {
@@ -59,3 +60,68 @@ func TestRustFuzz(t *testing.T) {
 		t.Errorf("rust_fuzz dependent library does not contain the expected flags (sancov-module, cfg fuzzing).")
 	}
 }
+
+func TestRustFuzzDepBundling(t *testing.T) {
+	ctx := testRust(t, `
+			cc_library {
+				name: "libcc_transitive_dep",
+			}
+			cc_library {
+				name: "libcc_direct_dep",
+			}
+			rust_library {
+				name: "libtest_fuzzing",
+				crate_name: "test_fuzzing",
+				srcs: ["foo.rs"],
+				shared_libs: ["libcc_transitive_dep"],
+			}
+			rust_fuzz {
+				name: "fuzz_libtest",
+				srcs: ["foo.rs"],
+				rustlibs: ["libtest_fuzzing"],
+				shared_libs: ["libcc_direct_dep"],
+			}
+	`)
+
+	fuzz_libtest := ctx.ModuleForTests("fuzz_libtest", "android_arm64_armv8-a_fuzzer").Module().(*Module)
+
+	if !strings.Contains(fuzz_libtest.FuzzSharedLibraries().String(), ":libcc_direct_dep.so") {
+		t.Errorf("rust_fuzz does not contain the expected bundled direct shared libs ('libcc_direct_dep'): %#v", fuzz_libtest.FuzzSharedLibraries().String())
+	}
+	if !strings.Contains(fuzz_libtest.FuzzSharedLibraries().String(), ":libcc_transitive_dep.so") {
+		t.Errorf("rust_fuzz does not contain the expected bundled transitive shared libs ('libcc_transitive_dep'): %#v", fuzz_libtest.FuzzSharedLibraries().String())
+	}
+}
+
+func TestCCFuzzDepBundling(t *testing.T) {
+	ctx := testRust(t, `
+			cc_library {
+				name: "libcc_transitive_dep",
+			}
+			rust_ffi {
+				name: "libtest_fuzzing",
+				crate_name: "test_fuzzing",
+				srcs: ["foo.rs"],
+				shared_libs: ["libcc_transitive_dep"],
+			}
+			cc_fuzz {
+				name: "fuzz_shared_libtest",
+				shared_libs: ["libtest_fuzzing"],
+			}
+			cc_fuzz {
+				name: "fuzz_static_libtest",
+				static_libs: ["libtest_fuzzing"],
+			}
+
+	`)
+
+	fuzz_shared_libtest := ctx.ModuleForTests("fuzz_shared_libtest", "android_arm64_armv8-a_fuzzer").Module().(cc.LinkableInterface)
+	fuzz_static_libtest := ctx.ModuleForTests("fuzz_static_libtest", "android_arm64_armv8-a_fuzzer").Module().(cc.LinkableInterface)
+
+	if !strings.Contains(fuzz_shared_libtest.FuzzSharedLibraries().String(), ":libcc_transitive_dep.so") {
+		t.Errorf("cc_fuzz does not contain the expected bundled transitive shared libs from rust_ffi_shared ('libcc_transitive_dep'): %#v", fuzz_shared_libtest.FuzzSharedLibraries().String())
+	}
+	if !strings.Contains(fuzz_static_libtest.FuzzSharedLibraries().String(), ":libcc_transitive_dep.so") {
+		t.Errorf("cc_fuzz does not contain the expected bundled transitive shared libs from rust_ffi_static ('libcc_transitive_dep'): %#v", fuzz_static_libtest.FuzzSharedLibraries().String())
+	}
+}
diff --git a/rust/rust.go b/rust/rust.go
index 4324ecbb9..e524c9fb6 100644
--- a/rust/rust.go
+++ b/rust/rust.go
@@ -631,6 +631,15 @@ func (mod *Module) CcLibraryInterface() bool {
 	return false
 }
 
+func (mod *Module) RustLibraryInterface() bool {
+	if mod.compiler != nil {
+		if _, ok := mod.compiler.(libraryInterface); ok {
+			return true
+		}
+	}
+	return false
+}
+
 func (mod *Module) IsFuzzModule() bool {
 	if _, ok := mod.compiler.(*fuzzDecorator); ok {
 		return true