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<H1>[Mageia-dev] About syslinux & libpng</H1>
<B>Buchan Milne</B>
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TITLE="[Mageia-dev] About syslinux & libpng">bgmilne at staff.telkomsa.net
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<I>Tue Oct 4 11:30:29 CEST 2011</I>
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<PRE>On Monday, 3 October 2011 15:58:36 Michael Scherer wrote:
><i> Except if I start to replace this by "here is a nice syslinux boot image
</I>><i> with a duck". And then my code is run by syslinux, just because someone
</I>><i> took my png picture.
</I>
And the same person could say, "Here is my cool plymouth splash screen, use my
initrd", and there are 1000 easier ways to exploit this (than trying to
generate a PNG image with exploit code that someone would like enough to use
syslinux).
<troll>
Maybe we need to adopt secure UEFI, and sign our kernels and initial ram disks
...
</troll>
><i> So no, bundling is not without causing trouble.
</I>><i>
</I>><i> > So if we take this road of removing bootloader's libs, shall we also
</I>><i> > remove the jpeg/gz/gcc/... libs too, and maybe for other bootloaders too
</I>><i> > ?
</I>><i> >
</I>><i> > I do understand the need for the application that runs under linux...
</I>><i> > but about the bootloaders...
</I>><i>
</I>><i> Unless I am wrong, a bootloader run on ring 0 or can even ( like xen )
</I>><i> be used to run the kernel in a specific separate memory space ( ie,
</I>><i> virtualisation ). This could open a whole new range of problem ( like
</I>><i> the Blue Pill concept code published 5 years ago by Joanna Rutkowska )
</I>><i>
</I>><i> So I think that bootloader requires more consideration than regular
</I>><i> application.
</I>><i>
</I>><i> > What's your thoughts about it ?
</I>><i> > Would you agree on keep syslinux untouched regarding the png lib ?
</I>><i>
</I>><i> For reasons explained before, I would rather disagree.
</I>
But, users foolish enough to be tricked into booting malicious code can't
really be helped.
I think it would be better if syslinux was compatible with current upstream
libpng, so, if:
1)There is an upstream bug filed regarding support for current libpng
2)We have a registry of software building statically or with internal copies
of libraries, and syslinux is added with a reference to the upstream bug
then I think it is reasonable to build syslinux with internal libpng. Unless
you are going to mitigate *all* other attack vectors based on 'here, boot my
random binaries on your system'.
Regards,
Buchan
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