qt5base-lts/tools/configure/configure_pch.h
Giuseppe D'Angelo 33984e72ab QHash security fix (1/2): add global QHash seed
Algorithmic complexity attacks against hash tables have been known
since 2003 (cf. [1, 2]), and they have been left unpatched for years
until the 2011 attacks [3] against many libraries /
(reference) implementations of programming languages.

This patch adds a global integer, to be used as a seed for the hash
function itself. The seed is randomly initialized the first time a
QHash detaches from shared_null.

Right now the seed is not used at all -- another patch will modify
qHash to make use of it.

[1] http://www.cs.rice.edu/~scrosby/hash/CrosbyWallach_UsenixSec2003.pdf
[2] http://perldoc.perl.org/perlsec.html#Algorithmic-Complexity-Attacks
[3] http://www.ocert.org/advisories/ocert-2011-003.html

Task-number: QTBUG-23529
Change-Id: I7519e4c02b9c2794d1c14079b01330eb356e9c65
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2012-04-03 19:12:13 +02:00

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2.1 KiB
C

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// for rand_s, _CRT_RAND_S must be #defined before #including stdlib.h.
// put it at the beginning so some indirect inclusion doesn't break it
#ifndef _CRT_RAND_S
#define _CRT_RAND_S
#endif
#include <qplatformdefs.h>
#include <qglobal.h>
#include <qlist.h>
#include <qvariant.h> // All moc genereated code has this include
#include <qregexp.h>
#include <qstring.h>
#include <qstringlist.h>
#include <qtextcodec.h>