From owner-svn-src-head@FreeBSD.ORG Wed Sep 3 08:47:14 2014 Return-Path: Delivered-To: svn-src-head@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id E6E3C6F6; Wed, 3 Sep 2014 08:47:13 +0000 (UTC) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 866DE13D4; Wed, 3 Sep 2014 08:47:13 +0000 (UTC) Received: from tom.home (kib@localhost [127.0.0.1]) by kib.kiev.ua (8.14.9/8.14.9) with ESMTP id s838l7UN035262 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 3 Sep 2014 11:47:07 +0300 (EEST) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.9.2 kib.kiev.ua s838l7UN035262 Received: (from kostik@localhost) by tom.home (8.14.9/8.14.9/Submit) id s838l7sT035261; Wed, 3 Sep 2014 11:47:07 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Wed, 3 Sep 2014 11:47:07 +0300 From: Konstantin Belousov To: Gleb Smirnoff Subject: Re: svn commit: r270999 - head/sys/kern Message-ID: <20140903084707.GH2737@kib.kiev.ua> References: <201409030814.s838E7A2084257@svn.freebsd.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="wfk8K8yAAOQoLncY" Content-Disposition: inline In-Reply-To: <201409030814.s838E7A2084257@svn.freebsd.org> User-Agent: Mutt/1.5.23 (2014-03-12) X-Spam-Status: No, score=-2.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FREEMAIL_FROM,NML_ADSP_CUSTOM_MED autolearn=no autolearn_force=no version=3.4.0 X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on tom.home Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Sep 2014 08:47:14 -0000 --wfk8K8yAAOQoLncY Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Sep 03, 2014 at 08:14:07AM +0000, Gleb Smirnoff wrote: > Author: glebius > Date: Wed Sep 3 08:14:07 2014 > New Revision: 270999 > URL: http://svnweb.freebsd.org/changeset/base/270999 >=20 > Log: > Fix dereference after NULL check. > =20 > CID: 1234607 > Sponsored by: Nginx, Inc. >=20 > Modified: > head/sys/kern/kern_proc.c >=20 > Modified: head/sys/kern/kern_proc.c > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D > --- head/sys/kern/kern_proc.c Wed Sep 3 08:13:46 2014 (r270998) > +++ head/sys/kern/kern_proc.c Wed Sep 3 08:14:07 2014 (r270999) > @@ -921,10 +921,11 @@ fill_kinfo_proc_only(struct proc *p, str > kp->ki_xstat =3D p->p_xstat; > kp->ki_acflag =3D p->p_acflag; > kp->ki_lock =3D p->p_lock; > - if (p->p_pptr) > + if (p->p_pptr) { > kp->ki_ppid =3D proc_realparent(p)->p_pid; > - if (p->p_flag & P_TRACED) > - kp->ki_tracer =3D p->p_pptr->p_pid; > + if (p->p_flag & P_TRACED) > + kp->ki_tracer =3D p->p_pptr->p_pid; > + } > } If P_TRACED is set, p_pptr must be non-NULL. Or in reverse, only kernel process (pid 0) may have p_pptr as NULL, and it cannot be traced. Previous code contained assertion (triggered by paging hardware) that p_pptr is not NULL if P_TRACED is set. It is Coverity which cannot deduce the invariant. I do not expect any analyzer to be able to make the implication, though. --wfk8K8yAAOQoLncY Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBAgAGBQJUBtWLAAoJEJDCuSvBvK1BEpQP/RYW3XUszfAXBpDM7cojLBUR EAqN90D5uDWvBmDzjqQof804RfgV9hCNshBol9mzIlUQxxRvQo+006LTQ73Mc0aK XTOeALw49fh4AV3BdG54cnUeVpDgpzz2iojU5C+bPf2kzYDaLJDgNd10FyIsyRGR 5d2soMOA+rAW5m9SVPNnwVsZdRX8/dXsX9gESIqF2bT71Kfl7aURxFdE6qDCYtr8 oHaT4Qf3HlzzIj+eaSPRgqs6Te11NsD8h3VluSQyX3SDcRGPfIc3oYJg+MDsfTZq pRxDAqym1n0aD5UUu32sk93XUEt9hl1BVa4YstcCq5+8PBuCmd3Pker5sSiEOQwd 4s6knIjCM8QOukXUX00sn+iCIFYlFSFTOlbXhXc112gYbDO1nLOBPoI3Y4US4yuC UJlSOd9eQvPYvZtzx6/NIXNnWUUFc9qeU2TLXkjmSerd5lNTWt57Ix56EcZH8kPW j/1avXWU+vIaysxKnhZRwWpztJ6g1k25qQufBJmQHmqF0CR84YsUQ7Piz3ImP5j6 9wkXX0PY89bohmVsqzNftOBF4HpxZrKpQVK5gd/l7ujZ2bhTWLzEqOo+vwLgmM7H wQwaR0A8NE3Je528Mmme1TpzN6ZPgQ1d9Ge0K7MW8q8rj5BOvmvEDMCv5caI4yKn aV5rPuq4zKLVDbSlhmwG =HzmX -----END PGP SIGNATURE----- --wfk8K8yAAOQoLncY--