src/share/vm/prims/whitebox.cpp

rev 13541 : 8187045: [linux] Not all libraries in the VM are linked with -z,noexecstack.

*** 71,80 ****
--- 71,84 ----
  #include "services/mallocSiteTable.hpp"
  #include "services/memTracker.hpp"
  #include "utilities/nativeCallStack.hpp"
  #endif // INCLUDE_NMT
  
+ #ifdef LINUX
+ #include "utilities/elfFile.hpp"
+ #endif
+ 
  
  #define SIZE_T_MAX_VALUE ((size_t) -1)
  
  bool WhiteBox::_used = false;
  volatile bool WhiteBox::compilation_locked = false;
*** 1821,1830 ****
--- 1825,1848 ----
  
  WB_ENTRY(void, WB_RemoveCompilerDirective(JNIEnv* env, jobject o, jint count))
    DirectivesStack::pop(count);
  WB_END
  
+ // Checks that the library libfile has the noexecstack bit set.
+ WB_ENTRY(jboolean, WB_CheckLibSpecifiesNoexecstack(JNIEnv* env, jobject o, jstring libfile))
+   jboolean ret = false;
+ #ifdef LINUX
+   // Can't be in VM when we call JNI.
+   ThreadToNativeFromVM ttnfv(thread);
+   const char* lf = env->GetStringUTFChars(libfile, NULL);
+   CHECK_JNI_EXCEPTION_(env, 0);
+   ret = (jboolean) ElfFile::specifies_noexecstack(lf);
+   env->ReleaseStringUTFChars(libfile, lf);
+ #endif
+   return ret;
+ WB_END
+ 
  #define CC (char*)
  
  static JNINativeMethod methods[] = {
    {CC"getObjectAddress0",                CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress  },
    {CC"getObjectSize0",                   CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectSize     },
*** 2025,2034 ****
--- 2043,2054 ----
    {CC"supportsConcurrentGCPhaseControl", CC"()Z",     (void*)&WB_SupportsConcurrentGCPhaseControl},
    {CC"getConcurrentGCPhases",     CC"()[Ljava/lang/String;",
                                                        (void*)&WB_GetConcurrentGCPhases},
    {CC"requestConcurrentGCPhase0", CC"(Ljava/lang/String;)Z",
                                                        (void*)&WB_RequestConcurrentGCPhase},
+   {CC"checkLibSpecifiesNoexecstack", CC"(Ljava/lang/String;)Z",
+                                                       (void*)&WB_CheckLibSpecifiesNoexecstack},
  };
  
  #undef CC
  
  JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass))