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[ASan] Make insertion of version mismatch guard configurable

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By default ASan calls a versioned function
`__asan_version_mismatch_check_vXXX` from the ASan module constructor to
check that the compiler ABI version and runtime ABI version are
compatible. This ensures that we get a predictable linker error instead
of hard-to-debug runtime errors.

Sometimes, however, we want to skip this safety guard. This new command
line option allows us to do just that.

rdar://47891956

Reviewed By: kubamracek

Differential Revision: https://reviews.llvm.org/D66826

llvm-svn: 370258
This commit is contained in:
Julian Lettner 2019-08-28 20:40:55 +00:00
parent 3c9c5131da
commit 422b6b1146
2 changed files with 19 additions and 1 deletions
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8
lib/Transforms/Instrumentation/AddressSanitizer.cpp
View File

@ -193,6 +193,11 @@ static cl::opt<bool> ClRecover(
cl::desc("Enable recovery mode (continue-after-error)."),
cl::Hidden, cl::init(false));
static cl::opt<bool> ClInsertVersionCheck(
"asan-guard-against-version-mismatch",
cl::desc("Guard against compiler/runtime version mismatch."),
cl::Hidden, cl::init(true));
// This flag may need to be replaced with -f[no-]asan-reads.
static cl::opt<bool> ClInstrumentReads("asan-instrument-reads",
cl::desc("instrument read instructions"),
@ -2426,8 +2431,9 @@ bool ModuleAddressSanitizer::instrumentModule(Module &M) {
// Create a module constructor. A destructor is created lazily because not all
// platforms, and not all modules need it.
std::string AsanVersion = std::to_string(GetAsanVersion(M));
std::string VersionCheckName =
kAsanVersionCheckNamePrefix + std::to_string(GetAsanVersion(M));
ClInsertVersionCheck ? (kAsanVersionCheckNamePrefix + AsanVersion) : "";
std::tie(AsanCtorFunction, std::ignore) = createSanitizerCtorAndInitFunctions(
M, kAsanModuleCtorName, kAsanInitName, /*InitArgTypes=*/{},
/*InitArgs=*/{}, VersionCheckName);

12
test/Instrumentation/AddressSanitizer/version-mismatch-check.ll Normal file
View File

@ -0,0 +1,12 @@
; Check that the ASan module constructor guards against compiler/runtime version
; mismatch.
; RUN: opt < %s -asan-module -S | FileCheck %s
; RUN: opt < %s -asan-module -asan-guard-against-version-mismatch=0 -S | FileCheck %s --check-prefix=NOGUARD
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-unknown-linux-gnu"
; CHECK-LABEL: define internal void @asan.module_ctor()
; CHECK: call void @__asan_version_mismatch_check_v
; NOGUARD-NOT: call void @__asan_version_mismatch_check_v