linux-kernel - Re: [PATCH] vsprintf: Turn kptr

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Message-Id: <20110512.170845.1074260586094306244.davem@davemloft.net>
Date:	Thu, 12 May 2011 17:08:45 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	mingo@...e.hu
Cc:	torvalds@...ux-foundation.org, eranian@...gle.com, acme@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vsprintf: Turn kptr_restrict off by default

From: Ingo Molnar <mingo@...e.hu>
Date: Thu, 12 May 2011 23:00:28 +0200

> Subject: vsprintf: Turn kptr_restrict off by default
> 
> kptr_restrict has been triggering bugs in apps such as perf, and it also makes 
> the system less useful by default, so turn it off by default.
> 
> This is how we generally handle security features that remove functionality, 
> such as firewall code or SELinux - they have to be configured and activated 
> from user-space.
> 
> Distributions can turn kptr_restrict on again via this line in 
> /etc/sysctrl.conf:
> 
> kernel.kptr_restrict = 1
> 
> ( Also mark the variable __read_mostly while at it, as it's typically modified 
>   only once per bootup, or not at all. )
> 
> Signed-off-by: Ingo Molnar <mingo@...e.hu>

Acked-by: David S. Miller <davem@...emloft.net>
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