From b9b73ef9067371fbe78c34e0f3b23d014413a2f8 Mon Sep 17 00:00:00 2001
From: Alexander Potapenko <glider@google.com>
Date: Fri, 19 Jun 2015 12:19:07 +0000
Subject: [ASan] Initial support for Kernel AddressSanitizer

This patch adds initial support for the -fsanitize=kernel-address flag to Clang.
Right now it's quite restricted: only out-of-line instrumentation is supported, globals are not instrumented, some GCC kasan flags are not supported.
Using this patch I am able to build and boot the KASan tree with LLVMLinux patches from github.com/ramosian-glider/kasan/tree/kasan_llvmlinux.
To disable KASan instrumentation for a certain function attribute((no_sanitize("kernel-address"))) can be used.

llvm-svn: 240131
---
 clang/test/CodeGen/address-safety-attr-kasan.cpp | 38 ++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 clang/test/CodeGen/address-safety-attr-kasan.cpp

(limited to 'clang/test/CodeGen')

diff --git a/clang/test/CodeGen/address-safety-attr-kasan.cpp b/clang/test/CodeGen/address-safety-attr-kasan.cpp
new file mode 100644
index 00000000000..c84ba88291d
--- /dev/null
+++ b/clang/test/CodeGen/address-safety-attr-kasan.cpp
@@ -0,0 +1,38 @@
+// Make sure the sanitize_address attribute is emitted when using both ASan and KASan.
+// Also document that __attribute__((no_sanitize_address)) doesn't disable KASan instrumentation.
+
+/// RUN: %clang_cc1 -triple i386-unknown-linux -emit-llvm -o - %s | FileCheck -check-prefix=CHECK-NOASAN %s
+/// RUN: %clang_cc1 -triple i386-unknown-linux -fsanitize=address -emit-llvm -o - %s | FileCheck -check-prefix=CHECK-ASAN %s
+/// RUN: %clang_cc1 -triple i386-unknown-linux -fsanitize=kernel-address -emit-llvm -o - %s | FileCheck -check-prefix=CHECK-KASAN %s
+
+int HasSanitizeAddress() {
+  return 1;
+}
+// CHECK-NOASAN: {{Function Attrs: nounwind$}}
+// CHECK-ASAN: Function Attrs: nounwind sanitize_address
+// CHECK-KASAN: Function Attrs: nounwind sanitize_address
+
+__attribute__((no_sanitize("address")))
+int NoSanitizeQuoteAddress() {
+  return 0;
+}
+// CHECK-NOASAN: {{Function Attrs: nounwind$}}
+// CHECK-ASAN: {{Function Attrs: nounwind$}}
+// CHECK-KASAN: {{Function Attrs: nounwind sanitize_address$}}
+
+__attribute__((no_sanitize_address))
+int NoSanitizeAddress() {
+  return 0;
+}
+// CHECK-NOASAN: {{Function Attrs: nounwind$}}
+// CHECK-ASAN: {{Function Attrs: nounwind$}}
+// CHECK-KASAN: {{Function Attrs: nounwind sanitize_address$}}
+
+__attribute__((no_sanitize("kernel-address")))
+int NoSanitizeKernelAddress() {
+  return 0;
+}
+
+// CHECK-NOASAN: {{Function Attrs: nounwind$}}
+// CHECK-ASAN: {{Function Attrs: nounwind sanitize_address$}}
+// CHECK-KASAN: {{Function Attrs: nounwind$}}
-- 
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