linux-kernel - Re: [PATCH] stack: Declare {randomize_,}kstack

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Message-ID: <ca0fa9d2-64dd-0e77-71b6-3673e353c316@csgroup.eu>
Date:   Wed, 29 Jun 2022 05:10:39 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     "GONG, Ruiqi" <gongruiqi1@...wei.com>,
        Kees Cook <keescook@...omium.org>,
        Marco Elver <elver@...gle.com>
CC:     Xiu Jianfeng <xiujianfeng@...wei.com>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] stack: Declare {randomize_,}kstack_offset to fix Sparse
 warnings



Le 29/06/2022 à 05:29, GONG, Ruiqi a écrit :
> Fix the following Sparse warnings that got noticed when the PPC-dev
> patchwork was checking another patch (see the link below):
> 
> init/main.c:862:1: warning: symbol 'randomize_kstack_offset' was not declared. Should it be static?
> init/main.c:864:1: warning: symbol 'kstack_offset' was not declared. Should it be static?
> 
> Which in fact are triggered on all architectures that have
> HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET support (for instances x86, arm64
> etc).
> 
> Link: https://lore.kernel.org/lkml/e7b0d68b-914d-7283-827c-101988923929@huawei.com/T/#m49b2d4490121445ce4bf7653500aba59eefcb67f
> Cc: Christophe Leroy <christophe.leroy@...roup.eu>
> Cc: Xiu Jianfeng <xiujianfeng@...wei.com>
> Signed-off-by: GONG, Ruiqi <gongruiqi1@...wei.com>
> ---
>   init/main.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/init/main.c b/init/main.c
> index e2490387db2b..6aa0fb2340cc 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -101,6 +101,10 @@
>   #include <linux/stackdepot.h>
>   #include <net/net_namespace.h>
> 
> +#ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET

You don't need this #ifdef, there is already one inside 
linux/randomize_kstack.h

> +#include <linux/randomize_kstack.h>
> +#endif
> +
>   #include <asm/io.h>
>   #include <asm/bugs.h>
>   #include <asm/setup.h>
> --
> 2.25.1
>