ports/152882: comms/rxtx page fault/crash
Bob Frazier
bobf at mrp3.com
Tue Dec 7 06:10:11 UTC 2010
>Number: 152882
>Category: ports
>Synopsis: comms/rxtx page fault/crash
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-ports-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Dec 07 06:10:10 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: Bob Frazier
>Release: 7.3-STABLE
>Organization:
S.F.T. Inc.
>Environment:
FreeBSD BSDSilver.SFT.local 7.3-STABLE FreeBSD 7.3-STABLE #12: Tue Nov 23 20:43:00 PST 2010 root at BSDSilver.SFT.local:/usr/obj/usr/src/sys/GENERIC amd64
>Description:
A software coding error in comms/rxtx causes a page fault when attempting to access a java variable by reference. The error is due to incorrect use of GetIntField instead of GetObjectField. A set of patches have been included that appear to correct the problem when placed into the 'files' directory of the port prior to building the port.
>How-To-Repeat:
using a java COMM application (such as devel/arduino) attempt to do serial I/O on a comm port. In my case it was a USB comm port '/dev/ttyU0'. Simply attempting a transfer is enough to cause the crash.
>Fix:
the three files src/SerialImp.c src/SerialImp.cpp and src/SerialImp.h must be patched using the attached files (or similar).
Patch attached with submission follows:
# This is a shell archive. Save it in a file, remove anything before
# this line, and then unpack it by entering "sh file". Note, it may
# create directories; files and directories will be owned by you and
# have default permissions.
#
# This archive contains:
#
# rxtx
# rxtx/files
# rxtx/files/patch-SerialImp.h
# rxtx/files/patch-SerialImp.cpp
# rxtx/files/patch-SerialImp.c
#
echo c - rxtx
mkdir -p rxtx > /dev/null 2>&1
echo c - rxtx/files
mkdir -p rxtx/files > /dev/null 2>&1
echo x - rxtx/files/patch-SerialImp.h
sed 's/^X//' >rxtx/files/patch-SerialImp.h << '375c7bbc64083cac744fa1f2532d67e4'
X--- src/SerialImp.h.orig 2005-07-05 10:47:21.000000000 -0700
X+++ src/SerialImp.h 2010-12-05 21:47:42.000000000 -0800
X@@ -438,8 +438,13 @@
X void system_does_not_unlock( const char *, int );
X int check_group_uucp();
X int check_lock_pid( const char *, int );
X int printj(JNIEnv *env, wchar_t *fmt, ...);
X
X+// BBB added
X+void deref_java_object( JNIEnv *env, jobject jobj );
X+void * get_java_varP( JNIEnv *env, jobject jobj, char *id, char *type );
X+
X+
X #define UNEXPECTED_LOCK_FILE "RXTX Error: Unexpected lock file: %s\n Please report to the RXTX developers\n"
X #define LINUX_KERNEL_VERSION_ERROR "\n\n\nRXTX WARNING: This library was compiled to run with OS release %s and you are currently running OS release %s. In some cases this can be a problem. Try recompiling RXTX if you notice strange behavior. If you just compiled RXTX make sure /usr/include/linux is a symbolic link to the include files that came with the kernel source and not an older copy.\n\n\npress enter to continue\n"
X #define UUCP_ERROR "\n\n\nRXTX WARNING: This library requires the user running applications to be in\ngroup uucp. Please consult the INSTALL documentation. More information is\navaiable under the topic 'How can I use Lock Files with rxtx?'\n"
375c7bbc64083cac744fa1f2532d67e4
echo x - rxtx/files/patch-SerialImp.cpp
sed 's/^X//' >rxtx/files/patch-SerialImp.cpp << '29e44cd8508495ee769fe53c84b57552'
X--- src/SerialImp.cpp.orig 2004-10-12 01:59:27.000000000 -0700
X+++ src/SerialImp.cpp 2010-12-06 21:48:20.000000000 -0800
X@@ -1736,10 +1736,50 @@
X report("invalid file descriptor\n");
X #endif
X return result;
X }
X
X+void deref_java_object( JNIEnv *env, jobject jobj )
X+{
X+ jclass jclazz = env->GetObjectClass( env, jobj );
X+ env->DeleteLocalRef( env, jclazz );
X+}
X+
X+void * get_java_varP( JNIEnv *env, jobject jobj, char *id, char *type )
X+{
X+
X+
X+ ////////////////// Open Log File /////////////////////
X+ fp = fopen("RXTXOut.log", "a");
X+ fprintf(fp, "Brian is inside get_java_varP\n"); // !!!
X+ fclose(fp);
X+ ////////////////// Close Log File ////////////////////
X+
X+ void * result = 0;
X+ //jclass jclazz = (*env)->GetObjectClass( env, jobj );
X+ jclass jclazz = env->GetObjectClass( jobj ); // !!!
X+ //jfieldID jfd = (*env)->GetFieldID( env, jclazz, id, type );
X+ jfieldID jfd = env->GetFieldID( jclazz, id, type ); // !!!
X+
X+ if( !jfd ) {
X+ //(*env)->ExceptionDescribe( env );
X+ env->ExceptionDescribe(); // !!!
X+ //(*env)->ExceptionClear( env );
X+ env->ExceptionClear(); // !!!
X+ return result;
X+ }
X+ //result = (int)( (*env)->GetIntField( env, jobj, jfd ) );
X+ result = (void *)( env->GetIntField( jobj, jfd ) ); // !!!
X+/* ct7 & gel * Added DeleteLocalRef */
X+ //(*env)->DeleteLocalRef( env, jclazz );
X+// env->DeleteLocalRef( jclazz ); // !!!
X+#ifdef DEBUG
X+ if(!strncmp("fd",id,2) && result == 0)
X+ report("invalid file descriptor\n");
X+#endif
X+ return result;
X+}
X /*----------------------------------------------------------
X throw_java_exception
X
X accept: env (keyhole to java)
X *exc (exception class name)
29e44cd8508495ee769fe53c84b57552
echo x - rxtx/files/patch-SerialImp.c
sed 's/^X//' >rxtx/files/patch-SerialImp.c << '5ac5e6c673ede56f265b5168ecba1897'
X--- src/SerialImp.c.orig 2006-01-29 14:19:04.000000000 -0800
X+++ src/SerialImp.c 2010-12-05 22:41:39.000000000 -0800
X@@ -1528,11 +1528,11 @@
X ----------------------------------------------------------*/
X JNIEXPORT jboolean JNICALL RXTXPort(nativeDrain)( JNIEnv *env,
X jobject jobj, jboolean interrupted )
X {
X int fd = get_java_var( env, jobj,"fd","I" );
X- struct event_info_struct *eis = ( struct event_info_struct * ) get_java_var( env, jobj, "eis", "J" );
X+ struct event_info_struct *eis = ( struct event_info_struct * ) get_java_varP( env, jobj, "eis", "J" ); // does not deref
X int result, count=0;
X
X char message[80];
X
X ENTER( "SerialImp.c:drain()" );
X@@ -1545,16 +1545,21 @@
X
X sprintf( message, "RXTXPort:drain() returns: %i\n", result );
X report_verbose( message );
X #if defined(__sun__)
X /* FIXME: No time to test on all OS's for production */
X+ deref_java_object(env, jobj);
X return( JNI_TRUE );
X #endif /* __sun__ */
X LEAVE( "RXTXPort:drain()" );
X if( result ) throw_java_exception( env, IO_EXCEPTION, "nativeDrain",
X strerror( errno ) );
X- if( interrupted ) return( JNI_FALSE );
X+ if( interrupted )
X+ {
X+ deref_java_object(env, jobj);
X+ return( JNI_FALSE );
X+ }
X #if !defined(TIOCSERGETLSR) && !defined(WIN32)
X if( eis && eis->writing )
X {
X eis->writing=JNI_FALSE;
X eis->output_buffer_empty_flag = 0;
X@@ -1565,10 +1570,12 @@
X struct event_info_struct myeis =
X build_threadsafe_eis( env, &jobj, eis );
X send_event( &myeis, SPE_OUTPUT_BUFFER_EMPTY, 1 );
X }
X report_time_end( );
X+
X+ deref_java_object(env, jobj);
X return( JNI_FALSE );
X }
X
X /*----------------------------------------------------------
X RXTXPort.sendBreak
X@@ -2937,11 +2944,11 @@
X struct timeval tv, *tvP;
X fd_set rset;
X /* TRENT */
X int flag, count = 0;
X struct event_info_struct *eis = ( struct event_info_struct * )
X- get_java_var( env, *jobj,"eis","J" );
X+ get_java_varP( env, *jobj,"eis","J" ); // does not dereference object (pointer remains valid)
X
X report_time_start();
X flag = eis->eventflags[SPE_DATA_AVAILABLE];
X eis->eventflags[SPE_DATA_AVAILABLE] = 0;
X /*
X@@ -2957,10 +2964,11 @@
X if (timeout >= 0) {
X now = GetTickCount();
X if ( now-start >= timeout )
X {
X eis->eventflags[SPE_DATA_AVAILABLE] = flag;
X+ deref_java_object( env, *jobj );
X return bytes;
X }
X }
X
X FD_ZERO(&rset);
X@@ -2983,22 +2991,25 @@
X #endif /* WIN32 */
X if (ret == -1){
X report( "read_byte_array: select returned -1\n" );
X LEAVE( "read_byte_array" );
X eis->eventflags[SPE_DATA_AVAILABLE] = flag;
X+ deref_java_object( env, *jobj );
X return -1;
X }
X else if (ret > 0)
X {
X if ((ret = READ( fd, buffer + bytes, left )) < 0 ){
X if (errno != EINTR && errno != EAGAIN){
X report( "read_byte_array: read returned -1\n" );
X LEAVE( "read_byte_array" );
X eis->eventflags[SPE_DATA_AVAILABLE] = flag;
X+ deref_java_object( env, *jobj );
X return -1;
X }
X eis->eventflags[SPE_DATA_AVAILABLE] = flag;
X+ deref_java_object( env, *jobj );
X return -1;
X }
X else if ( ret ) {
X bytes += ret;
X left -= ret;
X@@ -3031,10 +3042,12 @@
X report( msg );
X LEAVE( "read_byte_array" );
X report_time_end();
X */
X eis->eventflags[SPE_DATA_AVAILABLE] = flag;
X+
X+ deref_java_object( env, *jobj );
X return bytes;
X }
X
X #ifdef asdf
X int read_byte_array( JNIEnv *env,
X@@ -4898,10 +4911,43 @@
X LEAVE( "get_java_var" );
X */
X return result;
X }
X
X+void deref_java_object( JNIEnv *env, jobject jobj )
X+{
X+ jclass jclazz = (*env)->GetObjectClass( env, jobj );
X+ (*env)->DeleteLocalRef( env, jclazz );
X+}
X+
X+void * get_java_varP( JNIEnv *env, jobject jobj, char *id, char *type )
X+{
X+ void * result = 0;
X+ jclass jclazz = (*env)->GetObjectClass( env, jobj );
X+ jfieldID jfd = (*env)->GetFieldID( env, jclazz, id, type );
X+
X+/*
X+ ENTER( "get_java_var" );
X+*/
X+ if( !jfd ) {
X+ (*env)->ExceptionDescribe( env );
X+ (*env)->ExceptionClear( env );
X+ (*env)->DeleteLocalRef( env, jclazz );
X+ LEAVE( "get_java_var" );
X+ return result;
X+ }
X+ result = (void *)( (*env)->GetObjectField( env, jobj, jfd ) );
X+/* ct7 & gel * Added DeleteLocalRef */
X+// (*env)->DeleteLocalRef( env, jclazz );
X+ if(!strncmp( "fd",id,2) && result == 0)
X+ report_error( "get_java_var: invalid file descriptor\n" );
X+/*
X+ LEAVE( "get_java_var" );
X+*/
X+ return result;
X+}
X+
X /*----------------------------------------------------------
X throw_java_exception
X
X accept: env (keyhole to java)
X *exc (exception class name)
5ac5e6c673ede56f265b5168ecba1897
exit
>Release-Note:
>Audit-Trail:
>Unformatted:
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