Re: [PATCH] x86-64, espfix: Don't leak bits 31:16 of %esp returning to 16-bit stack

[Linus Torvalds]

On Tue, Apr 29, 2014 at 5:15 PM, H. Peter Anvin <hpa@xxxxxxxxxxxxxxx> wrote:
>
> Linus, this is technically a (functionality) regression fix.  Will you
> want this for 3.15?

Too scary. If people complain, I think we should just replace the

        if (!ldt_info.seg_32bit) {

with something like

        if (!ldt_info.seg_32bit && !sysctl_allow_16bit_segments) {

and handle the regression that way.

Then, after way more testing, maybe we can backport the espfix thing.

            Linus
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