On Tue, Sep 29, 2015 at 10:25:52AM -0700, Andy Lutomirski wrote: > On Tue, Sep 29, 2015 at 8:19 AM, Greg Kroah-Hartman > <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > 3.14-stable review patch. If anyone has any objections, please let me know. > > > > ------------------ > > > > From: Andy Lutomirski <luto@xxxxxxxxxx> > > > > commit 9b6e6a8334d56354853f9c255d1395c2ba570e0a upstream. > > > > Returning to userspace is tricky: IRET can fail, and ESPFIX can > > rearrange the stack prior to IRET. > > Just a heads up: under very strange circumstances (most likely > requires booting with paravirt-noreplace, which is hopefully only used > by Sasha), this causes a regression that's fixed by > 83c133cf11fb0e68a51681447e372489f052d40e. I'm not 100% sure that the > regression is observable at all, because the same strange > configuration may also hit the bug fixed by > fc57a7c68020dcf954428869eafd934c0ab1536f before the regression can > trigger. > > Anyway, you've been warned. I wouldn't worry too much about it, though. Thanks, that patch is still in my queue for future stable kernels, so it should trickle down soon. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html