Messages in this thread | | | Date | Mon, 17 Oct 2016 16:04:17 -0700 | From | Yu-cheng Yu <> | Subject | Re: [PATCH RFC 1/3] fpu/x86: add make_fpregs_active(_newstate) helper functions |
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On Mon, Oct 17, 2016 at 01:57:06PM -0700, Andy Lutomirski wrote: > Dave and/or Yu-cheng: didn't one of you have some code to allow a user > xstate buffer to be filled from the copy in kernel memory? If we did > that, we could avoid this mess entirely.
In copy_fpstate_to_sigframe() (arch/x86/kernel/fpu/signal.c), the assumption was we have lazy fpu:
if (fpregs_active() || we want an #NM exception) copy_fpregs_to_sigframe(); else copy kernel buffer to user buffer;
But this is not the true anymore. Or do you mean something else?
-- Yu-cheng
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