linux-kernel - Re: [PATCH v4 00/23] Merge text_poke fixes and executable lockdowns

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Message-ID: <20190425204904.GE14281@hirez.programming.kicks-ass.net>
Date:   Thu, 25 Apr 2019 22:49:04 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc:     Borislav Petkov <bp@...en8.de>, Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, hpa@...or.com,
        Thomas Gleixner <tglx@...utronix.de>,
        Nadav Amit <nadav.amit@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux_dti@...oud.com, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, akpm@...ux-foundation.org,
        kernel-hardening@...ts.openwall.com, linux-mm@...ck.org,
        will.deacon@....com, ard.biesheuvel@...aro.org,
        kristen@...ux.intel.com, deneen.t.dock@...el.com
Subject: Re: [PATCH v4 00/23] Merge text_poke fixes and executable lockdowns

On Thu, Apr 25, 2019 at 10:48:20PM +0200, Peter Zijlstra wrote:
> On Mon, Apr 22, 2019 at 11:57:42AM -0700, Rick Edgecombe wrote:
> > Andy Lutomirski (1):
> >   x86/mm: Introduce temporary mm structs
> > 
> > Nadav Amit (15):
> >   Fix "x86/alternatives: Lockdep-enforce text_mutex in text_poke*()"
> >   x86/jump_label: Use text_poke_early() during early init
> >   x86/mm: Save DRs when loading a temporary mm
> >   fork: Provide a function for copying init_mm
> >   x86/alternative: Initialize temporary mm for patching
> >   x86/alternative: Use temporary mm for text poking
> >   x86/kgdb: Avoid redundant comparison of patched code
> >   x86/ftrace: Set trampoline pages as executable
> >   x86/kprobes: Set instruction page as executable
> >   x86/module: Avoid breaking W^X while loading modules
> >   x86/jump-label: Remove support for custom poker
> >   x86/alternative: Remove the return value of text_poke_*()
> >   x86/alternative: Comment about module removal races
> >   tlb: provide default nmi_uaccess_okay()
> >   bpf: Fail bpf_probe_write_user() while mm is switched
> > 
> > Rick Edgecombe (7):
> >   x86/mm/cpa: Add set_direct_map_ functions
> >   mm: Make hibernate handle unmapped pages
> >   vmalloc: Add flag for free of special permsissions
> >   modules: Use vmalloc special flag
> >   bpf: Use vmalloc special flag
> >   x86/ftrace: Use vmalloc special flag
> >   x86/kprobes: Use vmalloc special flag
> 
> This all looks good to me, I'll queue them tomorrow when I'm awake
> again. I'll move the last two patches to early in the series, since it
> appears to me they're fixes and should be in place before we make the
> situation worse with the temporary mm swizzling for text_poke.
> 
> If you want to post a new version of patch 4 before then, that'd be
> awesome, otherwise I'll see if I can do those few edits myself.

Patch 3 that was, see, I can't even count straight atm :-)