linux-kernel - Re: [PATCH v4] posix timers: allocate timer id per process

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Date:	Fri, 19 Oct 2012 12:43:03 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stanislav Kinsbursky <skinsbursky@...allels.com>
Cc:	"peterz@...radead.org" <peterz@...radead.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"devel@...nvz.org" <devel@...nvz.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pavel Emelianov <xemul@...allels.com>
Subject: Re: [PATCH v4] posix timers: allocate timer id per process

On Fri, 2012-10-19 at 13:38 +0400, Stanislav Kinsbursky wrote:
> 19.10.2012 11:56, Eric Dumazet пишет:
> > I wonder if some applications relied on our idr, assuming they would get
> > low values for their timer id.
> > (We could imagine some applications use a table indexed by the timer id)
> 
> Hmm.
> Probably, this particular case can be optimised by tuning min_id to id of 
> releasing timer (if id of this timer is less than current->signal min_id).
> Does this approach solves the issue you mentioned above?

Not generally, but I am not sure we want a per signal_struct idr ;)

Really that should be clearly explained in the changelog, so that buggy
applications can have a clue of what happened.

When we changed UDP source port selection being random instead of
sequential, maybe this broke some applications. That was an
implementation choice (with security impact).



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