1 files changed, 77 insertions, 2 deletions

diff --git a/src/tools/qstring.cpp b/src/tools/qstring.cpp
index 86ba42469..878f3e60f 100644
--- a/src/tools/qstring.cpp
+++ b/src/tools/qstring.cpp
@@ -65,10 +65,18 @@
 #if defined(Q_WS_WIN)
 #include "qt_windows.h"
 #endif
+#if defined(Q_OS_LINUX)
+#include <sys/mman.h>
+#endif
 #if !defined( QT_NO_COMPONENT ) && !defined( QT_LITE_COMPONENT )
 #include "ntqcleanuphandler.h"
 #endif
 
+#if defined(Q_OS_LINUX)
+#define LINUX_MEMLOCK_LIMIT_BYTES 16384
+#define LINUX_MEMLOCK_LIMIT_CHARACTERS LINUX_MEMLOCK_LIMIT_BYTES/sizeof(TQChar)
+#endif
+
 #ifndef LLONG_MAX
 #define LLONG_MAX TQ_INT64_C(9223372036854775807)
 #endif
@@ -1025,6 +1033,14 @@ static inline bool format(TQChar::Decomposition tag, TQString & str,
 } // format()
 #endif
 
+TQStringData::~TQStringData() {
+    if ( unicode ) delete[] ((char*)unicode);
+    if ( ascii && security_unpaged ) {
+	munlock(ascii, LINUX_MEMLOCK_LIMIT_BYTES);
+    }
+    if ( ascii ) delete[] ascii;
+}
+
 /*
   TQString::compose() and visual() were developed by Gordon Tisher
   <tisher@uniserve.ca>, with input from Lars Knoll <knoll@mpi-hd.mpg.de>,
@@ -1203,19 +1219,34 @@ static TQChar* internalLatin1ToUnicode( const char *str, uint* len,
 }
 
 /*!
+    ABI compatibility
+*/
+
+char* TQString::unicodeToLatin1(const TQChar *uc, uint l)
+{
+    return unicodeToLatin1(uc, l, false);
+}
+
+/*!
     This utility function converts \a l 16-bit characters from \a uc
     to ASCII, returning a '\0'-terminated string.
 
     The caller is responsible for deleting the resultant string with
     delete[].
 */
-char* TQString::unicodeToLatin1(const TQChar *uc, uint l)
+
+char* TQString::unicodeToLatin1(const TQChar *uc, uint l, bool unpaged)
 {
     if (!uc) {
 	return 0;
     }
     char *a = new char[l+1];
     char *result = a;
+    if (unpaged) {
+#if defined(Q_OS_LINUX)
+	mlock(result, LINUX_MEMLOCK_LIMIT_BYTES);
+#endif
+    }
     while (l--) {
 	*a++ = (uc->unicode() > 0xff) ? '?' : (char)uc->unicode();
 	uc++;
@@ -1707,8 +1738,10 @@ void TQString::setLength( uint newLen )
 	if ( nd ) {
 	    uint len = TQMIN( d->len, newLen );
 	    memcpy( nd, d->unicode, sizeof(TQChar) * len );
+	    bool unpaged = d->security_unpaged;
 	    deref();
 	    d = new TQStringData( nd, newLen, newMax );
+	    setSecurityUnPaged(unpaged);
 	}
     } else {
 	d->len = newLen;
@@ -1760,8 +1793,10 @@ void TQString::reserve( uint minCapacity )
 	    uint len = d->len;
 	    if ( len )
 		memcpy( nd, d->unicode, sizeof(TQChar) * len );
+	    bool unpaged = d->security_unpaged;
 	    deref();
 	    d = new TQStringData( nd, len, minCapacity );
+	    setSecurityUnPaged(unpaged);
 	}
     }
 }
@@ -1780,8 +1815,10 @@ void TQString::squeeze()
 	    uint len = d->len;
 	    if ( len )
 		memcpy( nd, d->unicode, sizeof(TQChar) * len );
+	    bool unpaged = d->security_unpaged;
 	    deref();
 	    d = new TQStringData( nd, len, len );
+	    setSecurityUnPaged(unpaged);
 	}
     }
 }
@@ -2744,9 +2781,11 @@ TQString& TQString::fill( TQChar c, int len )
     if ( len == 0 ) {
 	*this = "";
     } else {
+	bool unpaged = d->security_unpaged;
 	deref();
 	TQChar * nd = QT_ALLOC_QCHAR_VEC( len );
 	d = new TQStringData(nd,len,len);
+	setSecurityUnPaged(unpaged);
 	while (len--) *nd++ = c;
     }
     return *this;
@@ -5678,8 +5717,15 @@ TQString &TQString::operator+=( char c )
 const char* TQString::latin1() const
 {
     if ( !d->ascii  || !d->islatin1 ) {
+	if (d->security_unpaged) {
+#if defined(Q_OS_LINUX)
+	    if (d->ascii) {
+		munlock(d->ascii, LINUX_MEMLOCK_LIMIT_BYTES);
+	    }
+#endif
+	}
 	delete [] d->ascii;
-	d->ascii = unicodeToLatin1( d->unicode, d->len );
+	d->ascii = unicodeToLatin1( d->unicode, d->len, d->security_unpaged );
 	d->islatin1 = TRUE;
     }
     return d->ascii;
@@ -5699,10 +5745,22 @@ const char* TQString::ascii() const
 #ifndef QT_NO_TEXTCODEC
     if ( TQTextCodec::codecForCStrings() ) {
 	if ( !d->ascii || d->islatin1 ) {
+	    if (d->security_unpaged) {
+#if defined(Q_OS_LINUX)
+		if (d->ascii) {
+		    munlock(d->ascii, LINUX_MEMLOCK_LIMIT_BYTES);
+		}
+#endif
+	    }
 	    delete [] d->ascii;
 	    if (d->unicode) {
 		TQCString s = TQTextCodec::codecForCStrings()->fromUnicode( *this );
                 d->ascii = new char[s.length() + 1];
+		if (d->security_unpaged) {
+#if defined(Q_OS_LINUX)
+		    mlock(d->ascii, LINUX_MEMLOCK_LIMIT_BYTES);
+#endif
+		}
                 memcpy(d->ascii, s.data(), s.length() + 1);
 	    } else {
 		d->ascii = 0;
@@ -5715,6 +5773,23 @@ const char* TQString::ascii() const
     return latin1();
 }
 
+void TQString::setSecurityUnPaged(bool lock) {
+    if (lock != d->security_unpaged) {
+	if (d->security_unpaged) {
+	    if (d->ascii) {
+		munlock(d->ascii, LINUX_MEMLOCK_LIMIT_BYTES);
+	    }
+	    d->security_unpaged = false;
+	}
+	else {
+	    if (d->ascii) {
+		mlock(d->ascii, LINUX_MEMLOCK_LIMIT_BYTES);
+	    }
+	    d->security_unpaged = true;
+	}
+    }
+}
+
 /*!
     Returns the string encoded in UTF-8 format.