Messages in this thread | | | Subject | Re: [PATCH] bcache: make kobj_type structures constant | From | Coly Li <> | Date | Wed, 15 Feb 2023 00:16:03 +0800 |
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> 2023年2月14日 23:21,Thomas Weißschuh <linux@weissschuh.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@weissschuh.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
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