8325621: Improve jspawnhelper version checks

Reviewed-by: erikj, shade, rriggs, ihse

make/modules/java.base/Launcher.gmk

@@ -78,7 +78,8 @@ ifeq ($(call isTargetOsType, unix), true)
       NAME := jspawnhelper, \
       SRC := $(TOPDIR)/src/$(MODULE)/unix/native/jspawnhelper, \
       OPTIMIZATION := LOW, \
-      CFLAGS := $(CFLAGS_JDKEXE) -I$(TOPDIR)/src/$(MODULE)/unix/native/libjava, \
+      CFLAGS := $(CFLAGS_JDKEXE) $(VERSION_CFLAGS) \
+          -I$(TOPDIR)/src/$(MODULE)/unix/native/libjava, \
       EXTRA_OBJECT_FILES := $(SUPPORT_OUTPUTDIR)/native/$(MODULE)/libjava/childproc$(OBJ_SUFFIX), \
       LDFLAGS := $(LDFLAGS_JDKEXE), \
       OUTPUT_DIR := $(SUPPORT_OUTPUTDIR)/modules_libs/$(MODULE), \

make/modules/java.base/lib/CoreLibraries.gmk

@@ -59,6 +59,7 @@ $(eval $(call SetupJdkLibrary, BUILD_LIBJAVA, \
     CFLAGS := $(CFLAGS_JDKLIB) \
         $(LIBJAVA_CFLAGS), \
     jdk_util.c_CFLAGS := $(VERSION_CFLAGS), \
+    ProcessImpl_md.c_CFLAGS := $(VERSION_CFLAGS), \
     DISABLED_WARNINGS_gcc_ProcessImpl_md.c := unused-result, \
     LDFLAGS := $(LDFLAGS_JDKLIB) \
         $(call SET_SHARED_LIBRARY_ORIGIN), \

src/java.base/unix/native/jspawnhelper/jspawnhelper.c

@@ -29,6 +29,7 @@
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -50,6 +51,10 @@ extern int errno;
 #define ERR_PIPE 2
 #define ERR_ARGS 3
 
+#ifndef VERSION_STRING
+#error VERSION_STRING must be defined
+#endif
+
 void error (int fd, int err) {
     if (write (fd, &err, sizeof(err)) != sizeof(err)) {
         /* Not sure what to do here. I have no one to speak to. */
@@ -59,6 +64,7 @@ void error (int fd, int err) {
 }
 
 void shutItDown() {
+    fprintf(stdout, "jspawnhelper version %s\n", VERSION_STRING);
     fprintf(stdout, "This command is not for general use and should ");
     fprintf(stdout, "only be run as the result of a call to\n");
     fprintf(stdout, "ProcessBuilder.start() or Runtime.exec() in a java ");
@@ -141,19 +147,29 @@ int main(int argc, char *argv[]) {
     int r, fdinr, fdinw, fdout;
     sigset_t unblock_signals;
 
-    if (argc != 2) {
-        shutItDown();
-    }
-
 #ifdef DEBUG
     jtregSimulateCrash(0, 4);
 #endif
-    r = sscanf (argv[1], "%d:%d:%d", &fdinr, &fdinw, &fdout);
+
+    if (argc != 3) {
+        fprintf(stdout, "Incorrect number of arguments: %d\n", argc);
+        shutItDown();
+    }
+
+    if (strcmp(argv[1], VERSION_STRING) != 0) {
+        fprintf(stdout, "Incorrect Java version: %s\n", argv[1]);
+        shutItDown();
+    }
+
+    r = sscanf (argv[2], "%d:%d:%d", &fdinr, &fdinw, &fdout);
     if (r == 3 && fcntl(fdinr, F_GETFD) != -1 && fcntl(fdinw, F_GETFD) != -1) {
         fstat(fdinr, &buf);
-        if (!S_ISFIFO(buf.st_mode))
+        if (!S_ISFIFO(buf.st_mode)) {
+            fprintf(stdout, "Incorrect input pipe\n");
             shutItDown();
+        }
     } else {
+        fprintf(stdout, "Incorrect FD array data: %s\n", argv[2]);
         shutItDown();
     }
 

src/java.base/unix/native/libjava/ProcessImpl_md.c

@@ -300,6 +300,10 @@ Java_java_lang_ProcessImpl_init(JNIEnv *env, jclass clazz)
 #define WTERMSIG(status) ((status)&0x7F)
 #endif
 
+#ifndef VERSION_STRING
+#error VERSION_STRING must be defined
+#endif
+
 static const char *
 getBytes(JNIEnv *env, jbyteArray arr)
 {
@@ -488,7 +492,7 @@ spawnChild(JNIEnv *env, jobject process, ChildStuff *c, const char *helperpath)
     pid_t resultPid;
     int i, offset, rval, bufsize, magic;
     char *buf, buf1[(3 * 11) + 3]; // "%d:%d:%d\0"
-    char *hlpargs[3];
+    char *hlpargs[4];
     SpawnInfo sp;
 
     /* need to tell helper which fd is for receiving the childstuff
@@ -497,11 +501,13 @@ spawnChild(JNIEnv *env, jobject process, ChildStuff *c, const char *helperpath)
     snprintf(buf1, sizeof(buf1), "%d:%d:%d", c->childenv[0], c->childenv[1], c->fail[1]);
     /* NULL-terminated argv array.
      * argv[0] contains path to jspawnhelper, to follow conventions.
-     * argv[1] contains the fd string as argument to jspawnhelper
+     * argv[1] contains the version string as argument to jspawnhelper
+     * argv[2] contains the fd string as argument to jspawnhelper
      */
     hlpargs[0] = (char*)helperpath;
-    hlpargs[1] = buf1;
-    hlpargs[2] = NULL;
+    hlpargs[1] = VERSION_STRING;
+    hlpargs[2] = buf1;
+    hlpargs[3] = NULL;
 
     /* Following items are sent down the pipe to the helper
      * after it is spawned.

test/jdk/java/lang/ProcessBuilder/JspawnhelperWarnings.java

@@ -25,7 +25,7 @@
 
 /*
  * @test
- * @bug 8325567
+ * @bug 8325567 8325621
  * @requires (os.family == "linux") | (os.family == "aix") | (os.family == "mac")
  * @library /test/lib
  * @run driver JspawnhelperWarnings
@@ -47,11 +47,30 @@ public class JspawnhelperWarnings {
         OutputAnalyzer oa = new OutputAnalyzer(p);
         oa.shouldHaveExitValue(1);
         oa.shouldContain("This command is not for general use");
+        if (nArgs != 2) {
+            oa.shouldContain("Incorrect number of arguments");
+        } else {
+            oa.shouldContain("Incorrect Java version");
+        }
+    }
+
+    private static void testVersion() throws Exception {
+        String[] args = new String[3];
+        args[0] = Paths.get(System.getProperty("java.home"), "lib", "jspawnhelper").toString();
+        args[1] = "wrongVersion";
+        args[2] = "1:1:1";
+        Process p = ProcessTools.startProcess("jspawnhelper", new ProcessBuilder(args));
+        OutputAnalyzer oa = new OutputAnalyzer(p);
+        oa.shouldHaveExitValue(1);
+        oa.shouldContain("This command is not for general use");
+        oa.shouldContain("Incorrect Java version: wrongVersion");
     }
 
     public static void main(String[] args) throws Exception {
         for (int nArgs = 0; nArgs < 10; nArgs++) {
             tryWithNArgs(nArgs);
         }
+
+        testVersion();
     }
 }