On 11/17/2010 11:36 AM, nodata wrote: > On 17/11/10 10:20, drago01 wrote: >> On Wed, Nov 17, 2010 at 10:17 AM, nodata<lsof@xxxxxxxxxxxx> wrote: >>> 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? >> Yes, see https://bugs.adobe.com/jira/browse/FP-5739 > Adobe benefits from Flash in Linux. So it seems sensible to: > > 1. Get Adobe to commit to a fix soon WITH A $DATE > 2. Agree to patch the change until $DATE > 3. Adobe updates Flash, we revert the patch, everyone is happy I've e-mailed a with Shu Wang at Adobe (who is the assigned contact for this issue) about a date when they can have this fixed. You've got the e-mail thread regarding this below: On 11/17/2010 10:19 AM, Shu Wang wrote: > Hi Magnus, > > Maybe months. Thanks. > > Best regards. > Shu > > > -----Original Message----- > From: Magnus Glantz [mailto:the-mail-address-is-not-this-one@xxxxxxxxxx] > Sent: Wednesday, November 17, 2010 5:15 PM > To: Shu Wang > Subject: Re: FP-5739 "Strange sound on mp3 flash website with Fedora 14 x86_64" > > Hi Shu, > > That's is great to hear. Would you guess it's a matter of days, weeks or > months before this can get fixed? > If it will take a long time for you to fix this, Fedora may need to look > at some way to work around this bug. > > Best regards, > Magnus > > On 11/17/2010 10:06 AM, Shu Wang wrote: >> Hi Magnus, >> >> Thanks very much for your information. Flash Player team is investigating on it. It is in progress. Thanks. >> >> Best regards, >> Shu >> >> >> >> -----Original Message----- >> From: Magnus Glantz [mailto:the-mail-address-is-not-this-one@xxxxxxxxxx] >> Sent: Wednesday, November 17, 2010 4:47 PM >> To: Shu Wang >> Subject: FP-5739 "Strange sound on mp3 flash website with Fedora 14 x86_64" >> >> Hello Shu, >> >> I humbly wonder if you may have a time estimate on fixing FP-5739. >> It is seriously is affecting the ability to listen to sounds played in >> Flash for the users of Fedora. >> >> The issue has been traced to Adobe Flash by maintainers of glibc at Red >> Hat, Linus Torvalds and others. >> You may read more about this issue here: >> https://bugzilla.redhat.com/show_bug.cgi?id=638477 >> -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
