linux-kernel - Re: [PATCH] trivial: make mmap_min

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Date:	Wed, 21 Apr 2010 10:04:27 -0400
From:	Eric Paris <eparis@...hat.com>
To:	Kyle McMartin <kmcmartin@...hat.com>
Cc:	kees@...onical.com, cebbert@...hat.com,
	linux-kernel@...r.kernel.org, jmorris@...ei.org
Subject: Re: [PATCH] trivial: make mmap_min_addr perms 600

On Wed, 2010-04-21 at 10:00 -0400, Kyle McMartin wrote:
> Chuck points out that mmap_min_addr is 644...
> 
> CAP_SYS_RAWIO will deny users read/write to the file, let's let them see
> that this is intended.
> 
> Signed-off-by: Kyle McMartin <kyle@...hat.com>

I'm fine with it.  RAWIO was only really added to block writes as I
recall, but I don't see a good reason normal users need to see this and
blocking them with rwx perms first is a good idea.

Acked-by: Eric Paris <eparis@...hat.com>

James, do you want to pick up and push towards linus?

-Eric
> ---
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 8686b0f..5868481 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -1209,7 +1209,7 @@ static struct ctl_table vm_table[] = {
>  		.procname	= "mmap_min_addr",
>  		.data		= &dac_mmap_min_addr,
>  		.maxlen		= sizeof(unsigned long),
> -		.mode		= 0644,
> +		.mode		= 0600,
>  		.proc_handler	= mmap_min_addr_handler,
>  	},
>  #endif


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