Re: [RFC Patch] kcore: restrict access to the whole memory

[Cong Wang]

ä 2010å12æ23æ 07:02, Andrew Morton åé:
> On Wed, 22 Dec 2010 19:21:59 +0800
> Amerigo Wang<amwang@xxxxxxxxxx>  wrote:
>
> > This patch restricts /proc/kcore from accessing the whole memory,
> > instead, only an ELF header can be read.
> >
> > The initial patch was done by Vivek.
>
> Getting a bit tired of this.
>
> Are we supposed to be mind-readers?  How else are we to work out why
> you think Linux needs this feature?  What problems it solves?  What
> applications are expected to break and what the breakage patterns are?
> Why the benefits are worth the maintenance costs and the risk of
> breakage?  Why it's done with a config option and not a boot-time or
> runtime tunable?

Oh, sorry, I forgot to mention this is for security reasons,
I am adding Eugene into Cc so that he can explain more about this.

Yeah, I thought about sysctl too, but it is really weird for me
to control /proc/kcore contents via an sysctl file, I think
an Kconfig is enough.

Thanks!
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