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[asan] Do not instrument special purpose LLVM sections. 

Do not instrument globals that are placed in sections containing "__llvm"
in their name.

This fixes a bug in ASan / PGO interoperability. ASan interferes with LLVM's
PGO, which places its globals into a special section, which is memcpy-ed by
the linker as a whole. When those goals are instrumented, ASan's memcpy wrapper
reports an issue.

http://reviews.llvm.org/D10541

llvm-svn: 240723
This commit is contained in:
Anna Zaks 2015-06-25 23:35:48 +00:00
parent 4f652b69b1
commit 785c075786
3 changed files with 10 additions and 2 deletions
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2
llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
View File

@ -1144,6 +1144,8 @@ bool AddressSanitizerModule::ShouldInstrumentGlobal(GlobalVariable *G) {
// Globals from llvm.metadata aren't emitted, do not instrument them.
if (Section == "llvm.metadata") return false;
// Do not instrument globals from special LLVM sections.
if (Section.find("__llvm") != StringRef::npos) return false;
// Callbacks put into the CRT initializer/terminator sections
// should not be instrumented.

5
llvm/test/Instrumentation/AddressSanitizer/do-not-instrument-llvm-metadata-darwin.ll
View File

@ -1,12 +1,15 @@
; This test checks that we are not instrumenting globals in llvm.metadata.
; This test checks that we are not instrumenting globals in llvm.metadata
; and other llvm internal globals.
; RUN: opt < %s -asan -asan-module -S | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.10.0"
@.str_noinst = private unnamed_addr constant [4 x i8] c"aaa\00", section "llvm.metadata"
@.str_noinst_prof = private unnamed_addr constant [4 x i8] c"aaa\00", section "__DATA,__llvm_covmap"
@.str_inst = private unnamed_addr constant [4 x i8] c"aaa\00"
; CHECK-NOT: {{asan_gen.*str_noinst}}
; CHECK-NOT: {{asan_gen.*str_noinst_prof}}
; CHECK: {{asan_gen.*str_inst}}
; CHECK: @asan.module_ctor

5
llvm/test/Instrumentation/AddressSanitizer/do-not-instrument-llvm-metadata.ll
View File

@ -1,12 +1,15 @@
; This test checks that we are not instrumenting globals in llvm.metadata.
; This test checks that we are not instrumenting globals in llvm.metadata
; and other llvm internal globals.
; RUN: opt < %s -asan -asan-module -S | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@.str_noinst = private unnamed_addr constant [4 x i8] c"aaa\00", section "llvm.metadata"
@.str_noinst_prof = private unnamed_addr constant [4 x i8] c"aaa\00", section "__llvm_prf_data"
@.str_inst = private unnamed_addr constant [4 x i8] c"aaa\00"
; CHECK-NOT: {{asan_gen.*str_noinst}}
; CHECK-NOT: {{asan_gen.*str_noinst_prof}}
; CHECK: {{asan_gen.*str_inst}}
; CHECK: @asan.module_ctor