linux-kernel - Re: [PATCH v2 4/5] modules: Add CONFIG_ARCH_WANTS_MODULES_DATA_IN

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: <20220128140947.n2xea77txqohfbfj@maple.lan>
Date:   Fri, 28 Jan 2022 14:09:47 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Luis Chamberlain <mcgrof@...nel.org>, Jessica Yu <jeyu@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "kgdb-bugreport@...ts.sourceforge.net" 
        <kgdb-bugreport@...ts.sourceforge.net>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        Jason Wessel <jason.wessel@...driver.com>,
        Douglas Anderson <dianders@...omium.org>
Subject: Re: [PATCH v2 4/5] modules: Add
 CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC

On Thu, Jan 27, 2022 at 11:28:09AM +0000, Christophe Leroy wrote:
> Add CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC to allow architectures
> to request having modules data in vmalloc area instead of module area.
> 
> This is required on powerpc book3s/32 in order to set data non
> executable, because it is not possible to set executability on page
> basis, this is done per 256 Mbytes segments. The module area has exec
> right, vmalloc area has noexec.
> 
> This can also be useful on other powerpc/32 in order to maximize the
> chance of code being close enough to kernel core to avoid branch
> trampolines.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> Cc: Jason Wessel <jason.wessel@...driver.com>
> Cc: Daniel Thompson <daniel.thompson@...aro.org>
> Cc: Douglas Anderson <dianders@...omium.org>

Thanks for diligence in making sure kdb is up to date!

Acked-by: Daniel Thompson <daniel.thompson@...aro.org>


Daniel.