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Date: Sat, 18 Aug 2007 00:35:40 +0400 (MSD)
From: Dan Yefimov <>
To: Nicolas Rachinsky <>
Subject: Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death
 Signal Vulnerability

On Fri, 17 Aug 2007, Nicolas Rachinsky wrote:

> * Dan Yefimov <> [2007-08-17 05:27 +0400]:
> > BTW, SIGKILL and SIGSTOP can be issued by an O_ASYNC file I/O also (look in 
> > fcntl(2) at F_SETSIG section). If you use F_SETSIG for sending SIGKILL or 
> > SIGSTOP, there's nothing to be done with that - that behaviour is well 
> Looking in that man page I see:
>        F_GETSIG and F_SETSIG are Linux-specific.
And we consider Linux too. But anyway, they're unexploitable since signals set 
with F_SETSIG are subject to usual permission checks.

    Sincerely Your, Dan.

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