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

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Date:   Wed, 29 Jun 2022 13:51:15 +0800
From:   Gong Ruiqi <gongruiqi1@...wei.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        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



On 2022/06/29 13:10, Christophe Leroy wrote:
> 
> 
> 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
> 

Ah yes, I didn't notice the config was there already. I will send a new
version. Thanks for your reminder!

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