On 17/11/10 08:57, Hans de Goede 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. > > The problem has been analyzed and is known, as well as a fix for it, see: > https://bugzilla.redhat.com/show_bug.cgi?id=638477 > > The problem still exists however. The glibc developers say that this is > not a glibc bug, but a flash plugin bug. And technically they are 100% > correct, and the adobe flash plugin is a buggy .... (no surprise there). > To be specific the flash plugin is doing overlapping memcpy-s which is > clearly not how memcpy is supposed to be used. But the way the flash > plugin does overlapping memcpy's happens to work fine as long as one as > the c library does the memcpy-s in forward direction. And the new memcpy > implementation does the memcpy in backward direction. > > The glibc developers being technically 100% correct is not helping our > end users in this case though. So we (The Fedora project) need to come up > with a solution to help our end users, many of whom want to use the adobe > flash plugin. > > This solution could be reverting the problem causing glibc change, or > maybe changing it to do forward memcpy's while still using the new SSE > instructions, or something more specific to the flash plugin, as long > as it will automatically fix things with a yum upgrade without requiring > any further user intervention. > > I would also like to point out that if this were to happen in Ubuntu > which we sometimes look at jealously for getting more attention / users > then us, the glibc change would likely be reverted immediately, as that > is the right thing to do from an end user pov. > > I've filed a ticket for FESCo to look into this, as I believe this > makes us look really bad, and the glibc maintainers do not seem to be > willing to fix it without some sort of intervention: > https://fedorahosted.org/fesco/ticket/501 > > Regards, > > Hans Is someone talking to Adobe about this? -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
