linux-kernel - Re: [PATCH v9 30/44] arm64: kasan: Allow enabling in-kernel MTE

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: <20201113120000.GB3212@gaia>
Date:   Fri, 13 Nov 2020 12:00:01 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Vincenzo Frascino <vincenzo.frascino@....com>
Cc:     Andrey Konovalov <andreyknvl@...gle.com>,
        Will Deacon <will.deacon@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev@...glegroups.com, linux-arm-kernel@...ts.infradead.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 30/44] arm64: kasan: Allow enabling in-kernel MTE

On Fri, Nov 13, 2020 at 11:17:15AM +0000, Vincenzo Frascino wrote:
> On 11/12/20 9:43 AM, Catalin Marinas wrote:
> > On Tue, Nov 10, 2020 at 11:10:27PM +0100, Andrey Konovalov wrote:
> >> From: Vincenzo Frascino <vincenzo.frascino@....com>
> >>
> >> Hardware tag-based KASAN relies on Memory Tagging Extension (MTE)
> >> feature and requires it to be enabled. MTE supports
> >>
> >> This patch adds a new mte_init_tags() helper, that enables MTE in
> >> Synchronous mode in EL1 and is intended to be called from KASAN runtime
> >> during initialization.
> > 
> > There's no mte_init_tags() in this function.
> 
> During the rework, I realized that the description of mte_init_tags() in this
> patch refers to mte_enable_kernel(). In fact the only thing that mte_init_tags()
> does is to configure the GCR_EL1 register, hence my preference would be to keep
> all the code that deals with such a register in one patch.

Fine by me as long as the commit text is consistent with the diff.

-- 
Catalin