On Mon, 28 Aug 2023 17:08:57 +0200 Florent Revest <[email protected]> wrote:
> This extends the current PR_SET_MDWE prctl arg with a bit to indicate
> that the process doesn't want MDWE protection to propagate to children.
>
> To implement this no-inherit mode, the tag in current->mm->flags must be
> absent from MMF_INIT_MASK. This means that the encoding for "MDWE but
> without inherit" is different in the prctl than in the mm flags. This
> leads to a bit of bit-mangling in the prctl implementation.
Is a manpage update planned?
And did we update the manpage for PR_SET_MDWE?
On Fri, Sep 22, 2023 at 3:33 AM Andrew Morton <[email protected]> wrote:
>
> On Mon, 28 Aug 2023 17:08:57 +0200 Florent Revest <[email protected]> wrote:
>
> > This extends the current PR_SET_MDWE prctl arg with a bit to indicate
> > that the process doesn't want MDWE protection to propagate to children.
> >
> > To implement this no-inherit mode, the tag in current->mm->flags must be
> > absent from MMF_INIT_MASK. This means that the encoding for "MDWE but
> > without inherit" is different in the prctl than in the mm flags. This
> > leads to a bit of bit-mangling in the prctl implementation.
>
> Is a manpage update planned?
Ah that's a good point, I didn't think about it, thank you.
> And did we update the manpage for PR_SET_MDWE?
No we didn't but I sent a patch to man-pages here:
https://lore.kernel.org/linux-man/[email protected]/