linux-kernel - Re: [PATCH 6/7] powerpc/uaccess: Add unsafe_clear

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: <YMhOYKM5+s0wUoeP@infradead.org>
Date:   Tue, 15 Jun 2021 07:53:20 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] powerpc/uaccess: Add unsafe_clear_user()

On Tue, Jun 15, 2021 at 06:41:02AM +0000, Christophe Leroy wrote:
> Implement unsafe_clear_user() for powerpc.
> It's a copy/paste of unsafe_copy_to_user() with value 0 as source.
> 
> It may be improved in a later patch by using 'dcbz' instruction
> to zeroize full cache lines at once.

Please add this to common code insted of making it powerpc specific.