[arch-dev-public] APNG patch in libpng

[Jan de Groot]

On Thu, 2008-05-01 at 07:20 -0400, Travis Willard wrote:
> On Thu, May 1, 2008 at 6:04 AM, Jan de Groot <jan at jgc.homeip.net> wrote:
> >
> > On Wed, 2008-04-30 at 15:44 -0400, Travis Willard wrote:
> >  > Hey guys,
> >  >
> >  > Recent exploit found in libpng < 1.2.27
> >  > (http://bugs.archlinux.org/task/10192#comment27550) is getting a lot
> >  > of attention in our forums and bugtrackers, however since the APNG
> >  > patch (included for firefox3's sake -
> >  > http://bugs.archlinux.org/task/9570) isn't updated for the new libpng
> >  > version yet, I'm blocked on updating this.
> >  >
> >  > If I drop APNG from libpng to ensure we get updates as quick as
> >  > possible, this means firefox3 will need to be rebuilt without system
> >  > PNG.  If this happens, that means firefox3 will be using a vulnerable
> >  > version of the library, but I can react quicker to vulnerabilities
> >  > like this in the future.
> >  >
> >  > I'm not sure what is the best course of action.  Wait until a new APNG
> >  > patch is released? Update and force firefox3 to rebuild?
> >  >
> >  > >From the libpng website: "The pngtest  sample application distributed
> >  > with libpng, pngcrush, and certain versions of ImageMagick are known
> >  > to be affected, but the bug is otherwise believed to be quite rare." -
> >  > if the bug is quite rare, can we put it off?
> >  >
> >  > Any input?
> >
> >  I tried to build libpng 1.2.27 with apng patch, this is what I did to
> >  get a working package:
> >
> >  - apply the 1.2.25-apng patch, ignore the reject: the rejected patch
> >  adds checks that don't make sense with 1.2.27 as the variables should be
> >  NULL anyways.
> >  - Generate a new patch out of this, so we have a clean patch against
> >  1.2.27
> >  - Run the whole libtoolize --force --copy, aclocal, autoconf, automake
> >  crap
> >  - Run every make command with "ECHO=echo" appended, as libtool 2.2
> >  doesn't export this variable anymore (it's lt_ECHO now)
> >
> >  This resulted in a 1.2.27 package that still works with animated PNGs in
> >  firefox 3.0b5.
> >
> >  OK to commit to testing?
> 
> Wow - you're awesome Jan.  Go for it.

Checked into testing-64, including changelog about the changes. Please
test and build for i686.