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8025922: JNI access to Strings need to check if the value field is non-null

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Reviewed-by: dholmes, dcubed
This commit is contained in:
Staffan Larsen 2013-10-05 15:18:57 +02:00
parent 738af149a2
commit dcbbb4d37b
2 changed files with 57 additions and 41 deletions
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24
hotspot/src/share/vm/prims/jni.cpp
View file

@ -3210,7 +3210,11 @@ JNI_QUICK_ENTRY(jsize, jni_GetStringLength(JNIEnv *env, jstring string))
HOTSPOT_JNI_GETSTRINGLENGTH_ENTRY(
env, string);
#endif /* USDT2 */
jsize ret = java_lang_String::length(JNIHandles::resolve_non_null(string));
jsize ret = 0;
oop s = JNIHandles::resolve_non_null(string);
if (java_lang_String::value(s) != NULL) {
ret = java_lang_String::length(s);
}
#ifndef USDT2
DTRACE_PROBE1(hotspot_jni, GetStringLength__return, ret);
#else /* USDT2 */
@ -3230,11 +3234,13 @@ JNI_QUICK_ENTRY(const jchar*, jni_GetStringChars(
HOTSPOT_JNI_GETSTRINGCHARS_ENTRY(
env, string, (uintptr_t *) isCopy);
#endif /* USDT2 */
jchar* buf = NULL;
oop s = JNIHandles::resolve_non_null(string);
int s_len = java_lang_String::length(s);
typeArrayOop s_value = java_lang_String::value(s);
if (s_value != NULL) {
int s_len = java_lang_String::length(s);
int s_offset = java_lang_String::offset(s);
jchar* buf = NEW_C_HEAP_ARRAY_RETURN_NULL(jchar, s_len + 1, mtInternal); // add one for zero termination
buf = NEW_C_HEAP_ARRAY_RETURN_NULL(jchar, s_len + 1, mtInternal); // add one for zero termination
/* JNI Specification states return NULL on OOM */
if (buf != NULL) {
if (s_len > 0) {
@ -3246,6 +3252,7 @@ JNI_QUICK_ENTRY(const jchar*, jni_GetStringChars(
*isCopy = JNI_TRUE;
}
}
}
#ifndef USDT2
DTRACE_PROBE1(hotspot_jni, GetStringChars__return, buf);
#else /* USDT2 */
@ -3313,7 +3320,11 @@ JNI_ENTRY(jsize, jni_GetStringUTFLength(JNIEnv *env, jstring string))
HOTSPOT_JNI_GETSTRINGUTFLENGTH_ENTRY(
env, string);
#endif /* USDT2 */
jsize ret = java_lang_String::utf8_length(JNIHandles::resolve_non_null(string));
jsize ret = 0;
oop java_string = JNIHandles::resolve_non_null(string);
if (java_lang_String::value(java_string) != NULL) {
ret = java_lang_String::utf8_length(java_string);
}
#ifndef USDT2
DTRACE_PROBE1(hotspot_jni, GetStringUTFLength__return, ret);
#else /* USDT2 */
@ -3332,16 +3343,19 @@ JNI_ENTRY(const char*, jni_GetStringUTFChars(JNIEnv *env, jstring string, jboole
HOTSPOT_JNI_GETSTRINGUTFCHARS_ENTRY(
env, string, (uintptr_t *) isCopy);
#endif /* USDT2 */
char* result = NULL;
oop java_string = JNIHandles::resolve_non_null(string);
if (java_lang_String::value(java_string) != NULL) {
size_t length = java_lang_String::utf8_length(java_string);
/* JNI Specification states return NULL on OOM */
char* result = AllocateHeap(length + 1, mtInternal, 0, AllocFailStrategy::RETURN_NULL);
result = AllocateHeap(length + 1, mtInternal, 0, AllocFailStrategy::RETURN_NULL);
if (result != NULL) {
java_lang_String::as_utf8_string(java_string, result, (int) length + 1);
if (isCopy != NULL) {
*isCopy = JNI_TRUE;
}
}
}
#ifndef USDT2
DTRACE_PROBE1(hotspot_jni, GetStringUTFChars__return, result);
#else /* USDT2 */

14
hotspot/src/share/vm/prims/jniCheck.cpp
View file

@ -1324,18 +1324,19 @@ JNI_ENTRY_CHECKED(const jchar *,
IN_VM(
checkString(thr, str);
)
jchar* newResult = NULL;
const jchar *result = UNCHECKED()->GetStringChars(env,str,isCopy);
assert (isCopy == NULL || *isCopy == JNI_TRUE, "GetStringChars didn't return a copy as expected");
if (result != NULL) {
size_t len = UNCHECKED()->GetStringLength(env,str) + 1; // + 1 for NULL termination
jint* tagLocation = (jint*) AllocateHeap(len * sizeof(jchar) + sizeof(jint), mtInternal);
*tagLocation = STRING_TAG;
jchar* newResult = (jchar*) (tagLocation + 1);
newResult = (jchar*) (tagLocation + 1);
memcpy(newResult, result, len * sizeof(jchar));
// Avoiding call to UNCHECKED()->ReleaseStringChars() since that will fire unexpected dtrace probes
// Note that the dtrace arguments for the allocated memory will not match up with this solution.
FreeHeap((char*)result);
}
functionExit(env);
return newResult;
JNI_END
@ -1394,18 +1395,19 @@ JNI_ENTRY_CHECKED(const char *,
IN_VM(
checkString(thr, str);
)
char* newResult = NULL;
const char *result = UNCHECKED()->GetStringUTFChars(env,str,isCopy);
assert (isCopy == NULL || *isCopy == JNI_TRUE, "GetStringUTFChars didn't return a copy as expected");
if (result != NULL) {
size_t len = strlen(result) + 1; // + 1 for NULL termination
jint* tagLocation = (jint*) AllocateHeap(len + sizeof(jint), mtInternal);
*tagLocation = STRING_UTF_TAG;
char* newResult = (char*) (tagLocation + 1);
newResult = (char*) (tagLocation + 1);
strcpy(newResult, result);
// Avoiding call to UNCHECKED()->ReleaseStringUTFChars() since that will fire unexpected dtrace probes
// Note that the dtrace arguments for the allocated memory will not match up with this solution.
FreeHeap((char*)result, mtInternal);
}
functionExit(env);
return newResult;
JNI_END