asan: kernel: make no_sanitize("address") attribute work with -fsanitize=kernel-address

Summary:
Right now to disable -fsanitize=kernel-address instrumentation, one needs to use no_sanitize("kernel-address"). Make either no_sanitize("address") or no_sanitize("kernel-address")  disable both ASan and KASan instrumentation. Also remove redundant test.

Patch by Andrey Konovalov

Reviewers: eugenis, kcc, glider, dvyukov, vitalybuka

Reviewed By: eugenis, vitalybuka

Differential Revision: https://reviews.llvm.org/D44981

llvm-svn: 329612

1 files changed, 8 insertions, 2 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index e5db4e52b4a..57b1c4b4db1 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -846,8 +846,14 @@ void CodeGenFunction::StartFunction(GlobalDecl GD,
 
   if (D) {
     // Apply the no_sanitize* attributes to SanOpts.
-    for (auto Attr : D->specific_attrs<NoSanitizeAttr>())
-      SanOpts.Mask &= ~Attr->getMask();
+    for (auto Attr : D->specific_attrs<NoSanitizeAttr>()) {
+      SanitizerMask mask = Attr->getMask();
+      SanOpts.Mask &= ~mask;
+      if (mask & SanitizerKind::Address)
+        SanOpts.set(SanitizerKind::KernelAddress, false);
+      if (mask & SanitizerKind::KernelAddress)
+        SanOpts.set(SanitizerKind::Address, false);
+    }
   }
 
   // Apply sanitizer attributes to the function.