linux-kernel - Re: [RFC 2/3] mm/vma: Introduce VM_ACCESS

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]

Date:   Tue, 3 Mar 2020 18:48:15 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Anshuman Khandual <anshuman.khandual@....com>, linux-mm@...ck.org
Cc:     Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Salter <msalter@...hat.com>,
        Nick Hu <nickhu@...estech.com>,
        Ley Foon Tan <ley.foon.tan@...el.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Guan Xuetao <gxt@....edu.cn>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Springer <rspringer@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.org,
        nios2-dev@...ts.rocketboards.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 2/3] mm/vma: Introduce VM_ACCESS_FLAGS

On 3/2/20 7:47 AM, Anshuman Khandual wrote:
> There are many places where all basic VMA access flags (read, write, exec)
> are initialized or checked against as a group. One such example is during
> page fault. Existing vma_is_accessible() wrapper already creates the notion
> of VMA accessibility as a group access permissions. Hence lets just create
> VM_ACCESS_FLAGS (VM_READ|VM_WRITE|VM_EXEC) which will not only reduce code
> duplication but also extend the VMA accessibility concept in general.
> 
> Cc: Russell King <linux@...linux.org.uk>
> CC: Catalin Marinas <catalin.marinas@....com>
> CC: Mark Salter <msalter@...hat.com>
> Cc: Nick Hu <nickhu@...estech.com>
> CC: Ley Foon Tan <ley.foon.tan@...el.com>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> Cc: Guan Xuetao <gxt@....edu.cn>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Rob Springer <rspringer@...gle.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-c6x-dev@...ux-c6x.org
> Cc: nios2-dev@...ts.rocketboards.org
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: linux-s390@...r.kernel.org
> Cc: linux-sh@...r.kernel.org
> Cc: devel@...verdev.osuosl.org
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>

Dunno. Such mask seems ok for testing flags, but it's a bit awkward when
initializing flags, where it covers just one of many combinations that seem
used. But no strong opinions, patch looks correct.