[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <9DE71214-283C-4410-B5A4-22DFDA7021F4@suse.de>
Date: Wed, 15 Feb 2023 00:16:03 +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.
Coly Li
Powered by blists - more mailing lists