Proposed F19 Feature: MEMSTOMP

[Jakub Jelinek]

On Thu, Jan 24, 2013 at 01:29:36PM -0500, Bill Nottingham wrote:
> Jaroslav Reznik (jreznik at redhat.com) said: 
> > = Features/MEMSTOMP =
> > https://fedoraproject.org/wiki/Features/MEMSTOMP
> > 
> > Feature owner(s): Jeff Law <law at redhat.com>
> > 
> > Include the MEMSTOMP DSOs in Fedora 19 to enable developers to more quickly 
> > detect certain library calls which result in undefined behaviour due to 
> > overlapping memory arguments.
> > 
> > == Detailed description ==
> > MEMSTOMP is a DSO which can be preloaded by an application to detect calls to 
> > library routines with overlapping memory arguments. Specifically MEMSTOMP will 
> > detect calls to the following routines with overalapping memory arguments:
> > 
> > [w]memcpy, str[n]cat, wcs[n]cat, str[n]cpy, wcs[n]cpy, [w]mempcpy, memccpy, 
> > stp[n]cpy
> > 
> > While valgrind can detect these cases, using a DSO such as MEMSTOMP can be 
> > significantly faster.
> > 
> > The MEMSTOMP code utilizes GPLV2+ and LGPL3 code. The GPLV2+ code is limited 
> > to the backtrace code which is not thread safe and may need to be 
> > disabled/rewritten. 
> 
> I assume this could be done as a system-wide LD_PRELOAD if desired?

If all multiarch versions are installed, yeah, you could put
/usr/$LIB/memstomp.so
into /etc/ld.so.preload

	Jakub