linux-kernel - Re: [PATCH] bcache: make kobj

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Date:   Wed, 5 Apr 2023 21:38:01 +0800
From:   Coly Li <colyli@...e.de>
To:     Thomas Weißschuh <linux@...ssschuh.net>
Cc:     Kent Overstreet <kent.overstreet@...il.com>,
        linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bcache: make kobj_type structures constant



> 2023年4月5日 01:38，Thomas Weißschuh <linux@...ssschuh.net> 写道：
> 
> Hi Coly,
> 
> On 2023-02-15 00:16:03+0800, Coly Li wrote:
>>> 2023年2月14日 23:21，Thomas Weißschuh <linux@...ssschuh.net> 写道：
>>> 
>>> On Tue, Feb 14, 2023 at 05:51:09PM +0800, Coly Li wrote:
>>>> 
>>>> 
>>>>> 2023年2月14日 11:13，Thomas Weißschuh <linux@...ssschuh.net> 写道：
>>>>> 
>>>>> Since commit ee6d3dd4ed48 ("driver core: make kobj_type constant.")
>>>>> the driver core allows the usage of const struct kobj_type.
>>>>> 
>>>>> Take advantage of this to constify the structure definitions to prevent
>>>>> modification at runtime.
>>>>> 
>>>> 
>>>> How the const structure definition can prevent modification at run time?
>>> 
>>> It will be put into .rodata instead of .data by the compiler.
>>> The .rodata section is mapped as read-only via the pagetable.
>>> 
>>> See Documentation/security/self-protection.rst
>>> "Function pointers and sensitive variables must not be writable".
>> 
>> I see. Thanks for the information.
>> 
>> This patch will be added into my testing queue, and submitted later.
> 
> It seems this was not submitted.
> Or did I miss it?

No I don’t submit it yet. It is not emergent fix, and stay with other testing patches together.

Do you want it to go now?

Coly Li