linux-kernel - Re: [Security] [PATCH 2/2] taskstats: restrict access to user

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Message-ID: <m2ipooe67r.fsf@firstfloor.org>
Date:	Mon, 19 Sep 2011 11:29:28 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Balbir Singh <bsingharora@...il.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	Shailabh Nagar <nagar@...ibm.com>,
	linux-kernel@...r.kernel.org, security@...nel.org,
	Eric Paris <eparis@...hat.com>,
	Stephen Wilson <wilsons@...rt.ca>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	kernel-hardening@...ts.openwall.com
Subject: Re: [Security] [PATCH 2/2] taskstats: restrict access to user

Linus Torvalds <torvalds@...ux-foundation.org> writes:
>  	rc = parse(info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK], mask);
> diff --git a/kernel/tsacct.c b/kernel/tsacct.c
> index 24dc60d9fa1f..110ca5a03bd6 100644
> --- a/kernel/tsacct.c
> +++ b/kernel/tsacct.c
> @@ -78,6 +78,7 @@ void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
>  
>  #define KB 1024

Needs to be 1024ULL, because the counters are 64bit.

>  #define MB (1024*KB)
> +#define KB_MASK (~(KB-1))

Otherwise you lose the upper 32bits here.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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