linux-kernel - Re: [PATCH v2 15/20] vmalloc: New flags for safe vfree on special perms

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Message-ID: <20190220161412.GE3447@zn.tnic>
Date:   Wed, 20 Feb 2019 17:14:12 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
Cc:     "ard.biesheuvel@...aro.org" <ard.biesheuvel@...aro.org>,
        "will.deacon@....com" <will.deacon@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "Dock, Deneen T" <deneen.t.dock@...el.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "nadav.amit@...il.com" <nadav.amit@...il.com>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "hpa@...or.com" <hpa@...or.com>,
        "kristen@...ux.intel.com" <kristen@...ux.intel.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "linux_dti@...oud.com" <linux_dti@...oud.com>,
        "luto@...nel.org" <luto@...nel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH v2 15/20] vmalloc: New flags for safe vfree on special
 perms

On Tue, Feb 19, 2019 at 07:42:53PM +0000, Edgecombe, Rick P wrote:
> So to capture both of those intentions, maybe I'll slightly tweak your
> suggestion to VM_FLUSH_RESET_PERMS?

Yeah, sure, better.

VM_HAS_SPECIAL_PERMS doesn't tell me what those special permissions are
while flush and reset permissions makes a lot more sense, thx.

> I had thought it was easier to read. If its not the case, I'll change it as you
> suggest.

My logic is, the less local vars, the easier to scan the code quickly.

> Ard had expressed interest in having the set_alias_() functions for Arm, and the
> names were chosen to be arch agnostic. He didn't explicitly commit but I was
> under the impression he might create an implementation for ARM and we could
> remove this block.

Yeah, Will has those on his radar too so we should be good here.

Thx.

-- 
Regards/Gruss,
    Boris.

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