linux-kernel - Re: [PATCH v2 0/5] Allocate module text and data separately

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] [day] [month] [year] [list]

Message-ID: <alpine.LSU.2.21.2202091639491.32090@pobox.suse.cz>
Date:   Wed, 9 Feb 2022 16:42:55 +0100 (CET)
From:   Miroslav Benes <mbenes@...e.cz>
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>
Subject: Re: [PATCH v2 0/5] Allocate module text and data separately

On Thu, 27 Jan 2022, Christophe Leroy wrote:

> This series 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. Without this change module data
> remains executable regardless of CONFIG_STRICT_MODULES_RWX.
> 
> 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.
> 
> Changes in v2:
> - Dropped first two patches which are not necessary. They may be added back later as a follow-up series.
> - Fixed the printks in GDB
> 
> Christophe Leroy (5):
>   modules: Always have struct mod_tree_root
>   modules: Prepare for handling several RB trees
>   modules: Introduce data_layout
>   modules: Add CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
>   powerpc: Select ARCH_WANTS_MODULES_DATA_IN_VMALLOC on book3s/32 and
>     8xx
> 
>  arch/Kconfig                |   6 ++
>  arch/powerpc/Kconfig        |   1 +
>  include/linux/module.h      |   8 ++
>  kernel/debug/kdb/kdb_main.c |  10 +-
>  kernel/module.c             | 193 +++++++++++++++++++++++++-----------
>  5 files changed, 156 insertions(+), 62 deletions(-)

Looks good to me apart from the typo I mentioned at v1. I will review 
again once it is rebased on Aaron's patch set.

Regards,
Miroslav