Re: + prctl-add-pr_set_proctitle_area-option-for-prctl.patch added to -mm tree

["H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>]

On 01/17/2010 04:56 PM, KOSAKI Motohiro wrote:
>>
>> Sorry for the late feedback...
>>
>> On the subject of this patch: would it also make sense to have a prctl()
>> to give the kernel the address of the "environ" variable, so that
>> /proc/*/environ can give the *current* environment inside the process
>> (which is otherwise strictly a user-space matter) as opposed to the
>> initial environment passed by the kernel (unless modified in-place)?
> 
> Thank you good comments! 
> I have two comments.
> 
> 1 Yes, to change /proc/*/environ makes lots sense. probably.
>   My last worry is, If security aware daemon want to hide environment intentionally,
>   it should be able to do. iow, automatical environ area finding seems bad. 
>   probably we need new prctl or new syscall.

Finding environ automatically is not only bad, but totally impractical
(how would the kernel know where environ is?)  However, libc could
invoke a prctl to point the kernel at environ.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.