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

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Message-ID: <CAKTCnznSPoYvjzH_GekABBZ4HkyoQPVjTjBsOjwpVMSxQRxBSA@mail.gmail.com>
Date:	Mon, 19 Sep 2011 23:17:16 +0530
From:	Balbir Singh <bsingharora@...il.com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	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

On Mon, Sep 19, 2011 at 11:09 PM, Vasiliy Kulikov <segoon@...nwall.com> wrote:
> On Mon, Sep 19, 2011 at 09:40 -0700, Linus Torvalds wrote:
>> diff --git a/kernel/taskstats.c b/kernel/taskstats.c
>> index e19ce1454ee1..5874d4866b3c 100644
>> --- a/kernel/taskstats.c
>> +++ b/kernel/taskstats.c
>> @@ -457,6 +457,8 @@ static int cmd_attr_register_cpumask(struct genl_info *info)
>>       cpumask_var_t mask;
>>       int rc;
>>
>> +     if (!capable(CAP_SYS_ADMIN))
>> +             return -EPERM;
>
> Shouldn't it simply protect taskstats_user_cmd()?  You may still poll
> the counters with TASKSTATS_CMD_ATTR_PID/TASKSTATS_CMD_ATTR_TGID.
>

Yep, it should if we want to move it all to root access.

Balbir
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