From b9b73ef9067371fbe78c34e0f3b23d014413a2f8 Mon Sep 17 00:00:00 2001 From: Alexander Potapenko 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/lib/CodeGen/BackendUtil.cpp | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) (limited to 'clang/lib/CodeGen/BackendUtil.cpp') diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp index 30e9ebffa28..f5edea7810a 100644 --- a/clang/lib/CodeGen/BackendUtil.cpp +++ b/clang/lib/CodeGen/BackendUtil.cpp @@ -201,8 +201,14 @@ static void addSanitizerCoveragePass(const PassManagerBuilder &Builder, static void addAddressSanitizerPasses(const PassManagerBuilder &Builder, legacy::PassManagerBase &PM) { - PM.add(createAddressSanitizerFunctionPass()); - PM.add(createAddressSanitizerModulePass()); + PM.add(createAddressSanitizerFunctionPass(/*CompileKernel*/false)); + PM.add(createAddressSanitizerModulePass(/*CompileKernel*/false)); +} + +static void addKernelAddressSanitizerPasses(const PassManagerBuilder &Builder, + legacy::PassManagerBase &PM) { + PM.add(createAddressSanitizerFunctionPass(/*CompileKernel*/true)); + PM.add(createAddressSanitizerModulePass(/*CompileKernel*/true)); } static void addMemorySanitizerPass(const PassManagerBuilder &Builder, @@ -328,6 +334,13 @@ void EmitAssemblyHelper::CreatePasses() { addAddressSanitizerPasses); } + if (LangOpts.Sanitize.has(SanitizerKind::KernelAddress)) { + PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast, + addKernelAddressSanitizerPasses); + PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0, + addKernelAddressSanitizerPasses); + } + if (LangOpts.Sanitize.has(SanitizerKind::Memory)) { PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast, addMemorySanitizerPass); -- cgit v1.2.3