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[sanitizer-coverage] make sure asan does not instrument coverage guards (reported in https://github.com/google/oss-fuzz/issues/84) 

llvm-svn: 287030
This commit is contained in:
Kostya Serebryany 2016-11-15 21:12:50 +00:00
parent cf8d1fc3d8
commit 9d6dc7b164
2 changed files with 11 additions and 3 deletions
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2
llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
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@ -514,7 +514,7 @@ void SanitizerCoverageModule::CreateFunctionGuardArray(size_t NumGuards,
ArrayType *ArrayOfInt32Ty = ArrayType::get(Int32Ty, NumGuards);
FunctionGuardArray = new GlobalVariable(
*CurModule, ArrayOfInt32Ty, false, GlobalVariable::PrivateLinkage,
Constant::getNullValue(ArrayOfInt32Ty), "__sancov_guard");
Constant::getNullValue(ArrayOfInt32Ty), "__sancov_gen_");
if (auto Comdat = F.getComdat())
FunctionGuardArray->setComdat(Comdat);
FunctionGuardArray->setSection(SanCovTracePCGuardSection);

12
llvm/test/Instrumentation/SanitizerCoverage/tracing-comdat.ll
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@ -1,5 +1,7 @@
; Test that the coverage guards have proper comdat
; RUN: opt < %s -sancov -sanitizer-coverage-level=3 -sanitizer-coverage-trace-pc-guard -S | FileCheck %s
; RUN: opt < %s -sancov -sanitizer-coverage-level=3 -sanitizer-coverage-trace-pc-guard -S | FileCheck %s
; Make sure asan does not instrument __sancov_gen_
; RUN: opt < %s -sancov -asan -asan-module -sanitizer-coverage-level=3 -sanitizer-coverage-trace-pc-guard -S | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
$Foo = comdat any
@ -9,4 +11,10 @@ entry:
ret void
}
; CHECK: @__sancov_guard = private global [1 x i32] zeroinitializer, section "__sancov_guards", comdat($Foo)
define linkonce_odr void @Bar() {
entry:
ret void
}
; CHECK: @__sancov_gen_ = private global [1 x i32] zeroinitializer, section "__sancov_guards", comdat($Foo)
; CHECK: @__sancov_gen_.1 = private global [1 x i32] zeroinitializer, section "__sancov_guards"