linux-kernel - Re: [PATCH v6 06/13] module: Move strict rwx support to a separate file

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Date:   Mon, 21 Feb 2022 06:31:07 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Aaron Tomlin <atomlin@...hat.com>,
        "mcgrof@...nel.org" <mcgrof@...nel.org>
CC:     "cl@...ux.com" <cl@...ux.com>,
        "pmladek@...e.com" <pmladek@...e.com>,
        "mbenes@...e.cz" <mbenes@...e.cz>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "jeyu@...nel.org" <jeyu@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
        "live-patching@...r.kernel.org" <live-patching@...r.kernel.org>,
        "atomlin@...mlin.com" <atomlin@...mlin.com>,
        "ghalat@...hat.com" <ghalat@...hat.com>,
        "allen.lkml@...il.com" <allen.lkml@...il.com>,
        "joe@...ches.com" <joe@...ches.com>,
        "msuchanek@...e.de" <msuchanek@...e.de>,
        "oleksandr@...alenko.name" <oleksandr@...alenko.name>
Subject: Re: [PATCH v6 06/13] module: Move strict rwx support to a separate
 file



Le 18/02/2022 à 22:25, Aaron Tomlin a écrit :
> No functional change.
> 
> This patch migrates code that makes module text
> and rodata memory read-only and non-text memory
> non-executable from core module code into
> kernel/module/strict_rwx.c.
> 
> Signed-off-by: Aaron Tomlin <atomlin@...hat.com>
> ---
>   kernel/module/Makefile     |  1 +
>   kernel/module/internal.h   | 38 +++++++++++++++
>   kernel/module/main.c       | 99 +-------------------------------------
>   kernel/module/strict_rwx.c | 84 ++++++++++++++++++++++++++++++++
>   4 files changed, 125 insertions(+), 97 deletions(-)
>   create mode 100644 kernel/module/strict_rwx.c

   CC      kernel/module/strict_rwx.o
In file included from ./include/linux/build_bug.h:5,
                  from ./include/linux/container_of.h:5,
                  from ./include/linux/list.h:5,
                  from ./include/linux/module.h:12,
                  from kernel/module/strict_rwx.c:8:
kernel/module/strict_rwx.c: In function 'frob_rodata':
kernel/module/strict_rwx.c:16:17: error: implicit declaration of 
function 'PAGE_ALIGNED'; did you mean 'IS_ALIGNED'? 
[-Werror=implicit-function-declaration]
    16 |         BUG_ON(!PAGE_ALIGNED(layout->base));
       |                 ^~~~~~~~~~~~
./include/linux/compiler.h:78:45: note: in definition of macro 'unlikely'
    78 | # define unlikely(x)    __builtin_expect(!!(x), 0)
       |                                             ^
kernel/module/strict_rwx.c:16:9: note: in expansion of macro 'BUG_ON'
    16 |         BUG_ON(!PAGE_ALIGNED(layout->base));
       |         ^~~~~~
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:288 : kernel/module/strict_rwx.o] 
Erreur 1



You have to include <linux/mm.h>

Christophe