Date: Mon, 27 Feb 2012 11:29:51 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Mikolaj Golub <trociny@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, Pawel Jakub Dawidek <pjd@freebsd.org> Subject: Re: svn commit: r232181 - in head/sys: kern sys Message-ID: <20120227092951.GB55074@deviant.kiev.zoral.com.ua> 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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--Y7P0gPYVJgs55uY0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Feb 27, 2012 at 10:49:59AM +0200, Mikolaj Golub wrote: >=20 > On Mon, 27 Feb 2012 09:28:11 +0100 Pawel Jakub Dawidek wrote: >=20 > 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 > >>=20 > >> Log: > >> Add sysctl to retrieve or set umask of another process. >=20 > PJD> "set umask of another process"? This seems... weird. What's the pur= pose > PJD> of this change? >=20 > When we were discussing this with Kostik and Robert, and I asked if it co= uld > be useful to have the sysctl rw, Kostik described a real situation when h= e had > had to change umask of another process: umask had not been set properly o= n 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 usefu= l. kgdb, not gdb. It is indeed possible to write a ptrace-based utility that inject a code payload that would change umask. Since this is very risky but indeed possib= le, having the straighforward kernel facility is justified. Patch puts the same restrictions on the caller as ptrace(). --Y7P0gPYVJgs55uY0 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (FreeBSD) iEYEARECAAYFAk9LTQ8ACgkQC3+MBN1Mb4hLYwCgh2jXh1tdvHOXqfJCry0ZkJPM kE4AoMz88aIr1aT7ZpoevFODTzVhiw63 =KTy8 -----END PGP SIGNATURE----- --Y7P0gPYVJgs55uY0--
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