From fdcbcfb0403d092dd5f9e54a8e9a530b785b26af Mon Sep 17 00:00:00 2001
From: Petr Hosek <phosek@chromium.org>
Date: Wed, 7 Mar 2018 02:49:58 +0000
Subject: [PATCH] [Driver] Enable SafeStack by default on Fuchsia

This is already used throughout the entire system, so make it a default.

Differential Revision: https://reviews.llvm.org/D44065

llvm-svn: 326867
---
 clang/lib/Driver/ToolChains/Fuchsia.cpp |  4 ++++
 clang/lib/Driver/ToolChains/Fuchsia.h   |  5 +++++
 clang/test/Driver/fuchsia.c             | 12 +++++++-----
 3 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/clang/lib/Driver/ToolChains/Fuchsia.cpp b/clang/lib/Driver/ToolChains/Fuchsia.cpp
index 5f4995c..aa6b939 100644
--- a/clang/lib/Driver/ToolChains/Fuchsia.cpp
+++ b/clang/lib/Driver/ToolChains/Fuchsia.cpp
@@ -284,3 +284,7 @@ SanitizerMask Fuchsia::getSupportedSanitizers() const {
   Res |= SanitizerKind::Scudo;
   return Res;
 }
+
+SanitizerMask Fuchsia::getDefaultSanitizers() const {
+  return SanitizerKind::SafeStack;
+}
diff --git a/clang/lib/Driver/ToolChains/Fuchsia.h b/clang/lib/Driver/ToolChains/Fuchsia.h
index 6f438de..e61eddc 100644
--- a/clang/lib/Driver/ToolChains/Fuchsia.h
+++ b/clang/lib/Driver/ToolChains/Fuchsia.h
@@ -60,10 +60,15 @@ public:
     return llvm::DebuggerKind::GDB;
   }
 
+  unsigned GetDefaultStackProtectorLevel(bool KernelOrKext) const override {
+    return 2; // SSPStrong
+  }
+
   std::string ComputeEffectiveClangTriple(const llvm::opt::ArgList &Args,
                                           types::ID InputType) const override;
 
   SanitizerMask getSupportedSanitizers() const override;
+  SanitizerMask getDefaultSanitizers() const override;
 
   RuntimeLibType
   GetRuntimeLibType(const llvm::opt::ArgList &Args) const override;
diff --git a/clang/test/Driver/fuchsia.c b/clang/test/Driver/fuchsia.c
index 57dbc73..1ec7935 100644
--- a/clang/test/Driver/fuchsia.c
+++ b/clang/test/Driver/fuchsia.c
@@ -10,6 +10,8 @@
 // CHECK: "-fuse-init-array"
 // CHECK: "-isysroot" "[[SYSROOT:[^"]+]]"
 // CHECK: "-internal-externc-isystem" "[[SYSROOT]]{{/|\\\\}}include"
+// CHECK: "-fsanitize=safe-stack"
+// CHECK: "-stack-protector" "2"
 // CHECK: "-fno-common"
 // CHECK: {{.*}}ld.lld{{.*}}" "-z" "rodynamic"
 // CHECK: "--sysroot=[[SYSROOT]]"
@@ -84,31 +86,31 @@
 // RUN: %clang %s -### --target=x86_64-fuchsia \
 // RUN:     -fsanitize=fuzzer 2>&1 \
 // RUN:     | FileCheck %s -check-prefix=CHECK-FUZZER-X86
-// CHECK-FUZZER-X86: "-fsanitize=fuzzer,fuzzer-no-link"
+// CHECK-FUZZER-X86: "-fsanitize=fuzzer,fuzzer-no-link,safe-stack"
 // CHECK-FUZZER-X86: "{{.*[/\\]}}libclang_rt.fuzzer-x86_64.a"
 
 // RUN: %clang %s -### --target=aarch64-fuchsia \
 // RUN:     -fsanitize=fuzzer 2>&1 \
 // RUN:     | FileCheck %s -check-prefix=CHECK-FUZZER-AARCH64
-// CHECK-FUZZER-AARCH64: "-fsanitize=fuzzer,fuzzer-no-link"
+// CHECK-FUZZER-AARCH64: "-fsanitize=fuzzer,fuzzer-no-link,safe-stack"
 // CHECK-FUZZER-AARCH64: "{{.*[/\\]}}libclang_rt.fuzzer-aarch64.a"
 
 // RUN: %clang %s -### --target=x86_64-fuchsia \
 // RUN:     -fsanitize=scudo 2>&1 \
 // RUN:     | FileCheck %s -check-prefix=CHECK-SCUDO-X86
-// CHECK-SCUDO-X86: "-fsanitize=scudo"
+// CHECK-SCUDO-X86: "-fsanitize=safe-stack,scudo"
 // CHECK-SCUDO-X86: "-pie"
 // CHECK-SCUDO-X86: "{{.*[/\\]}}libclang_rt.scudo-x86_64.so"
 
 // RUN: %clang %s -### --target=aarch64-fuchsia \
 // RUN:     -fsanitize=scudo 2>&1 \
 // RUN:     | FileCheck %s -check-prefix=CHECK-SCUDO-AARCH64
-// CHECK-SCUDO-AARCH64: "-fsanitize=scudo"
+// CHECK-SCUDO-AARCH64: "-fsanitize=safe-stack,scudo"
 // CHECK-SCUDO-AARCH64: "-pie"
 // CHECK-SCUDO-AARCH64: "{{.*[/\\]}}libclang_rt.scudo-aarch64.so"
 
 // RUN: %clang %s -### --target=x86_64-fuchsia \
 // RUN:     -fsanitize=scudo -fPIC -shared 2>&1 \
 // RUN:     | FileCheck %s -check-prefix=CHECK-SCUDO-SHARED
-// CHECK-SCUDO-SHARED: "-fsanitize=scudo"
+// CHECK-SCUDO-SHARED: "-fsanitize=safe-stack,scudo"
 // CHECK-SCUDO-SHARED: "{{.*[/\\]}}libclang_rt.scudo-x86_64.so"
-- 
2.7.4