[scudo] Add some runtime tests for the minimal runtime

[cryptoad]

Summary

As well as some tests to ensure that various combinations of the clang command
line flags work (shared/static/minimal).

[cryptoad]

Remove the symbol InternalAlloc as the test wouldn't pass on a standalone
build (actively requires gc-sections).

[cryptoad]

Disabling the fsanitize test on Android. When compiled with -static-libsan on
Android, linking fails due to -lrt & -lpthread being unavailable. I believe
this is linkSanitizerRuntimeDeps's fault.

[cryptoad]

Re-enabling the fsanitize test for Android, but this is contingent to the
landing of D48570.

[cryptoad]

Ping!

[cryptoad]

Rebasing.

[vitalybuka]

test/scudo/symbols.test

2

maybe UNSUPPORTED:

[cryptoad]

Addressing review comment.

test/scudo/fsanitize.c

+// Test various -fsanitize= combinations.
+
+// RUN: %clang -fsanitize=scudo %s -o %t
+// RUN: not %run %t 2>&1 | FileCheck %s
+
+// RUN: %clang -fsanitize=scudo -shared-libsan %s -o %t
+// RUN: env LD_LIBRARY_PATH=`dirname %shared_libscudo`:$LD_LIBRARY_PATH not %run %t 2>&1 | FileCheck %s
+// RUN: %clang -fsanitize=scudo -shared-libsan -fsanitize-minimal-runtime %s -o %t
+// RUN: env LD_LIBRARY_PATH=`dirname %shared_minlibscudo`:$LD_LIBRARY_PATH not %run %t 2>&1 | FileCheck %s
+
+// RUN: %clang -fsanitize=scudo -static-libsan %s -o %t
+// RUN: not %run %t 2>&1 | FileCheck %s
+// RUN: %clang -fsanitize=scudo -static-libsan -fsanitize-minimal-runtime %s -o %t
+// RUN: not %run %t 2>&1 | FileCheck %s
+
+#include <assert.h>
+#include <stdlib.h>
+
+int main(int argc, char *argv[]) {
+  unsigned long *p = (unsigned long *)malloc(sizeof(unsigned long));
+  assert(p);
+  *p = 0;
+  free(p);
+  free(p);
+  return 0;
+}
+
+// CHECK: ERROR: invalid chunk state

test/scudo/lit.cfg

 # -*- Python -*-
 
 import os
 
 # Setup config name.
 config.name = 'Scudo' + config.name_suffix
 
 # Setup source root.
 config.test_source_root = os.path.dirname(__file__)
 
 # Path to the shared library
 shared_libscudo = os.path.join(config.compiler_rt_libdir, "libclang_rt.scudo-%s.so" % config.target_arch)
+shared_minlibscudo = os.path.join(config.compiler_rt_libdir, "libclang_rt.scudo_minimal-%s.so" % config.target_arch)
 
 # Test suffixes.
-config.suffixes = ['.c', '.cc', '.cpp']
+config.suffixes = ['.c', '.cc', '.cpp', '.test']
 
 # C & CXX flags.
 c_flags = ([config.target_cflags] +
            ["-pthread",
            "-fPIE",
            "-pie",
            "-O0",
            "-UNDEBUG",
            "-ldl",
            "-Wl,--gc-sections"])
 
 # Android doesn't want -lrt.
 if not config.android:
   c_flags += ["-lrt"]
 
 cxx_flags = (c_flags + config.cxx_mode_flags + ["-std=c++11"])
 
 scudo_flags = ["-fsanitize=scudo"]
 
 def build_invocation(compile_flags):                                            
   return " " + " ".join([config.clang] + compile_flags) + " "
 
-# Add clang substitutions.
+# Add substitutions.
 config.substitutions.append(("%clang ", build_invocation(c_flags)))
 config.substitutions.append(("%clang_scudo ", build_invocation(c_flags + scudo_flags)))
 config.substitutions.append(("%clangxx_scudo ", build_invocation(cxx_flags + scudo_flags)))
 config.substitutions.append(("%shared_libscudo", shared_libscudo))
+config.substitutions.append(("%shared_minlibscudo", shared_minlibscudo))
 
 # Platform-specific default SCUDO_OPTIONS for lit tests.
 default_scudo_opts = ''
 if config.android:
   # Android defaults to abort_on_error=1, which doesn't work for us.
   default_scudo_opts = 'abort_on_error=0'
 
 if default_scudo_opts:
   config.environment['SCUDO_OPTIONS'] = default_scudo_opts
   default_scudo_opts += ':'
 config.substitutions.append(('%env_scudo_opts=',
                              'env SCUDO_OPTIONS=' + default_scudo_opts))
 
 # Hardened Allocator tests are currently supported on Linux only.
 if config.host_os not in ['Linux']:
    config.unsupported = True

test/scudo/preload.cpp

 // Test that the preloaded runtime works without linking the static library.
 
 // RUN: %clang %s -lstdc++ -o %t
-// RUN: env LD_PRELOAD=%shared_libscudo not %run %t 2>&1 | FileCheck %s
+// RUN: env LD_PRELOAD=%shared_libscudo    not %run %t 2>&1 | FileCheck %s
+// RUN: env LD_PRELOAD=%shared_minlibscudo not %run %t 2>&1 | FileCheck %s
 
 // This way of setting LD_PRELOAD does not work with Android test runner.
 // REQUIRES: !android
 
 #include <assert.h>
 
 int main(int argc, char *argv[]) {
   int *p = new int;
   assert(p);
   *p = 0;
   delete p;
   delete p;
   return 0;
 }
 
 // CHECK: ERROR: invalid chunk state

test/scudo/symbols.test

+REQUIRES: !android
+
+Verify that various functions are *not* present in the minimal binary. Presence
+of those symbols in the minimal runtime would mean that the split code made it
+back into the core Sanitizer runtime library.
+
+RUN: nm %shared_minlibscudo | not grep InternalAlloc
+RUN: nm %shared_minlibscudo | not grep Symbolizer
+RUN: nm %shared_minlibscudo | not grep Coverage