Re: [Security] [PATCH 2/2] taskstats: restrict access to user
From: Balbir Singh
Date: Mon Sep 19 2011 - 13:47:20 EST
On Mon, Sep 19, 2011 at 11:09 PM, Vasiliy Kulikov <segoon@xxxxxxxxxxxx> 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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