linux-kernel - Re: [PATCH 2/2] devcgroup: fix permission check when adding entry to child cgroup

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Date:	Mon, 7 Jul 2008 10:48:59 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [PATCH 2/2] devcgroup: fix permission check when adding entry
	to child cgroup

Quoting Li Zefan (lizf@...fujitsu.com):
>  # cat devices.list
>  c 1:3 r
>  # echo 'c 1:3 w' > sub/devices.allow
>  # cat sub/devices.list
>  c 1:3 w
> 
> As illustrated, the parent group has no write permission to /dev/null,
> so its child should not be allowed to add this write permission,
> which is documented in Documentation/controllers/devices.txt.
> 
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>

I have no idea where that came from (but see that it was in my original
submission).  Maybe I meant to do &, but that still isn't necessary.

Acked-by: Serge Hallyn <serue@...ibm.com>

thanks,
-serge

> ---
>  security/device_cgroup.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/security/device_cgroup.c b/security/device_cgroup.c
> index 1e2e28a..ddd92ce 100644
> --- a/security/device_cgroup.c
> +++ b/security/device_cgroup.c
> @@ -300,7 +300,7 @@ static int may_access_whitelist(struct dev_cgroup *c,
>  			continue;
>  		if (whitem->minor != ~0 && whitem->minor != refwh->minor)
>  			continue;
> -		if (refwh->access & (~(whitem->access | ACC_MASK)))
> +		if (refwh->access & (~whitem->access))
>  			continue;
>  		return 1;
>  	}
> -- 
> 1.5.4.rc3
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