Date: Mon, 27 Feb 2012 09:59:37 +0100 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Mikolaj Golub <trociny@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, Konstantin Belousov <kib@FreeBSD.org> Subject: Re: svn commit: r232181 - in head/sys: kern sys Message-ID: <20120227085937.GD1363@garage.freebsd.pl> In-Reply-To: <864nucd5jc.fsf@in138.ua3> References: <201202261425.q1QEPm9g069102@svn.freebsd.org> <20120227082811.GC1363@garage.freebsd.pl> <864nucd5jc.fsf@in138.ua3>
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[-- Attachment #1 --] On Mon, Feb 27, 2012 at 10:49:59AM +0200, Mikolaj Golub wrote: > > On Mon, 27 Feb 2012 09:28:11 +0100 Pawel Jakub Dawidek wrote: > > PJD> On Sun, Feb 26, 2012 at 02:25:48PM +0000, Mikolaj Golub wrote: > >> Author: trociny > >> Date: Sun Feb 26 14:25:48 2012 > >> New Revision: 232181 > >> URL: http://svn.freebsd.org/changeset/base/232181 > >> > >> Log: > >> Add sysctl to retrieve or set umask of another process. > > PJD> "set umask of another process"? This seems... weird. What's the purpose > PJD> of this change? > > When we were discussing this with Kostik and Robert, and I asked if it could > be useful to have the sysctl rw, Kostik described a real situation when he had > had to change umask of another process: umask had not been set properly on an > aplication start but it could not be restarted until the end of the day. > Kostik was able to fix it using gdb but having an easier way looked useful. As a debugging feature it might be useful, but I wonder if we don't open Pandora's box, as I can see the same arguments for being able to change process current working directory, its real/effective/saved uid/gid, its groups, etc. Application can get really confused by this. From what I see we require the process to have permission to debug the target process, which is fine, but wherever it is documented I'd like there be a warning this is for debug purposes and can confuse application. -- Pawel Jakub Dawidek http://www.wheelsystems.com FreeBSD committer http://www.FreeBSD.org Am I Evil? Yes, I Am! http://tupytaj.pl [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) iEYEARECAAYFAk9LRfgACgkQForvXbEpPzRxAgCgj+2KdqWT9VW3M+W5eE02ldpU zkQAnjAykxiGlnkZjDXHZqRoT7JEL7Z6 =jAZN -----END PGP SIGNATURE-----
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