llvm-svn: 176854

Summary:
The loader does not call mmap() through the PLT because it has to
bootstrap the process before libc is present.  Hooking dlopen() isn't
enough either because the loader runs module initializers before
returning, and they could run arbitrary msan instrumented code.

If msandr is present, then we can intercept the mmaps from dlopen at the
syscall layer and clear the shadow there.  If msandr is missing, we
clear the shadow after dlopen() and hope any initializers are trivial.

Reviewers: eugenis

CC: kcc, llvm-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D509

llvm-svn: 176818

Summary:
I'm hitting a big recursive report from:
  uninit on strlen ->
  __msan::PrintWarningWithOrigin() ->
  __msan::GetStackTrace() ->
  __sanitizer::StackTrace::SlowUnwindStack() ->
  _Unwind_Backtrace() ->
  ... libgcc calls ->
  uninit on strlen() ->
  ... repeats

Reviewers: eugenis

Differential Revision: http://llvm-reviews.chandlerc.com/D497

llvm-svn: 176555

llvm-svn: 176248

llvm-svn: 175737

llvm-svn: 175510

execle(argv[0], ...) is wrong, because argv[0] may contain a PATH-resolvable
program name. Execute /proc/self/exe instead.

llvm-svn: 175504

llvm-svn: 175499

[msan] don't check shadow inside interceptors if we are inside symbolizer; add weak function __msan_default_options that overrides default options

llvm-svn: 175040

llvm-svn: 174970

llvm-svn: 174956

Build system setup for MSan lit tests (build with freshly-built clang, run,
check output) - a nearly exact copy from ASan.
First 2 lit tests for MSan.

llvm-svn: 174876

[msan] add strip_path_prefix flag; print error summary; don't crash while printing summary if debug info is missing. The tests will follow later once we establish the lit-like tests for msan. 

llvm-svn: 174595

llvm-svn: 174059

And make msan_interface.h C-compatible.

llvm-svn: 173928

Use LLVM_BUILD_TYPE instead of CMAKE_BUILD_TYPE in compiler-rt unit tests to match the behavior of llvm unittests

llvm-svn: 173926

llvm-svn: 173910

Moved everything users are not supposed to use to a private interface header.
Documented all public interfaces. Made them safe to use even if built without
MemorySanitizer.

llvm-svn: 173800

llvm-svn: 173687

llvm-svn: 173686

llvm-svn: 173668

llvm-svn: 173456

llvm-svn: 173441

This is used in symbolizer init.

llvm-svn: 173263

llvm-svn: 173249

llvm-svn: 173161

llvm-svn: 173158

llvm-svn: 173157

llvm-svn: 173155

llvm-svn: 173154

A runtime call is used instead.
MSan will stop adding shadow checks on volatile stores soon.

llvm-svn: 173152

llvm-svn: 172978

CMake: create AddCompilerRT module and implement convenience add_compiler_rt_object_library function

llvm-svn: 172826

llvm-svn: 172817

Also add a missing include.

llvm-svn: 172814

llvm-svn: 172812

llvm-svn: 172809

llvm-svn: 172805

llvm-svn: 172791

The r172719 patch broke the build on Mac, the others depended on it.

compiler-rt/lib/asan/asan_interceptors.cc:78:13: error: unused function
      'SetThreadName' [-Werror,-Wunused-function]
      static void SetThreadName(const char *name) {

Orignal headlines:

  [asan] attempting to fix the Mac build
  [asan] restructure read/pread/pread64 tests
  [sanitizer] move write/pwrite/pwrite64 interceptors to common
  [msan] start using common interceptors in msan
  [tsan] move prctl interceptor from asan to common_interceptors thus enabling it for tsan too

llvm-svn: 172763