Fixing the glibc adobe flash incompatibility

Benjamin Kreuter ben.kreuter at gmail.com
Wed Nov 17 21:08:03 UTC 2010


On Wednesday 17 November 2010 15:21:55 Magnus Glantz wrote:
> On 11/17/2010 09:09 PM, Josh Boyer wrote:
> > On Wed, Nov 17, 2010 at 2:28 PM, Bruno Wolff III<bruno at wolff.to>  wrote:
> >> On Wed, Nov 17, 2010 at 08:57:20 +0100,
> >> 
> >>   Hans de Goede<hdegoede at redhat.com>  wrote:
> >>> Hi all,
> >>> 
> >>> For those who do not know it yet, recent Fedora glibc updates include
> >>> an optimized memcpy (which gets used on some processors) which breaks
> >>> the 64 bit adobe flash plugin.
> >> 
> >> I saw memcpy / memmove issues affecting squashfs-tools shortly before
> >> the F14 alpha. So we had some what of a heads up about the issue over
> >> three months ago. It is unfortunate that we didn't catch the flash
> >> issue during prerelease testing of F14. If this really is an important
> >> critera for releases, maybe we should be having QA testing that flash
> >> works.
> > 
> > I will be very, very, disappointed if that gets added as a criteria
> > for a Fedora release.  It would be no different than making sure the
> > nvidia driver works, and we certainly shouldn't be doing that either.
> > 
> > josh
> 
> I can relate to that. I'm all for pure open source, but..
> 
> I really can't see why it would be a bad thing Fedora would do QA on a
> proprietary software that is very important for a majority of the Fedora
> users.

We do not want to wind up on Adobe's schedule -- the problem is on Adobe's 
end, not ours, and we cannot even send them a fix.  The behavior of memcpy for 
overlapping ranges is not even defined, so there should be nothing stopping us 
from using a new implementation of memcpy.  The fact that a lot of people use 
the Flash plugin makes it even more important for *Adobe* to fix what can only 
be described as a bug in Flash, which is the current reliance on undefined 
behavior.

-- Ben



-- 
Message sent on: Wed Nov 17 15:57:16 EST 2010
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