svn commit: r232181 - in head/sys: kern sys

[Konstantin Belousov]

On Wed, Feb 29, 2012 at 02:37:25PM +0200, Mikolaj Golub wrote:
> 
> On Wed, 29 Feb 2012 12:03:00 +0000 Robert N. M. Watson wrote:
> 
>  RNMW> I think the monitoring aspect of the patch is fine.
> 
>  RNMW> The bit I was worried about was external umask changes. This can cause
>  RNMW> race conditions for applications that manage their umask -- for
>  RNMW> example, bsdtar, if I recall correctly. It's one thing to use a
>  RNMW> debugger to force an application to change its umask -- the developer
>  RNMW> needs to know they are changing application behaviour. But exposing a
>  RNMW> feature that can lead to correct applications but incorrect results is
>  RNMW> a risky thing to do, hence my objection.
> 
>  RNMW> I think given the other objections, it would be wise to remove write
>  RNMW> access to process umasks, but retain read access for procstat (which is
>  RNMW> quite useful, I agree).
> 
> I still don't see why having a sysctl RW is worse than asking users to run
> something like in the attach when they need to change umask for another
> process, but ok, if people don't like RW I will remove it.
> 
What is done is attach is much worse then the sysctl, just because
debugger attach often causes spurious EINTR, indeed seriously disrupting
applications, as opposed to some uncertain damage that could be done in
theory.

*shrug*
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