linux-kernel - Re: [patch 31/60] x86/mm/kpti: Add mapping helper functions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20171207083315.ccvdhywyd45gkz7t@pd.tnic>
Date:   Thu, 7 Dec 2017 09:33:15 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirsky <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Greg KH <gregkh@...uxfoundation.org>, keescook@...gle.com,
        hughd@...gle.com, Brian Gerst <brgerst@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        David Laight <David.Laight@...lab.com>,
        Eduardo Valentin <eduval@...zon.com>, aliguori@...zon.com,
        Will Deacon <will.deacon@....com>, daniel.gruss@...k.tugraz.at,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [patch 31/60] x86/mm/kpti: Add mapping helper functions

On Tue, Dec 05, 2017 at 05:01:34PM +0100, Borislav Petkov wrote:
> > +/*
> > + * Take a PGD location (pgdp) and a pgd value that needs to be set there.
> > + * Populates the user and returns the resulting PGD that must be set in
> > + * the kernel copy of the page tables.
> > + */
> > +static inline pgd_t kpti_set_user_pgd(pgd_t *pgdp, pgd_t pgd)
> > +{
> 
> Btw, do we want to inline a relatively big function like that? I see at
> least 20-ish callsites of set_pgd() only.

Yap, looking at Hugh's version, he has moved it to kaiser.c. I guess in
our case, that should be arch/x86/mm/kpti.c respectively.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--