Date: Mon, 09 Jul 2012 13:52:15 -0700 From: Xin Li <delphij@delphij.net> To: Mikolaj Golub <trociny@freebsd.org> Cc: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>, d@delphij.net, FreeBSD virtualization mailing list <freebsd-virtualization@FreeBSD.org> Subject: Re: GPF when doing jail -r, possibly an use-after-free Message-ID: <4FFB447F.6080508@delphij.net> In-Reply-To: <86wr2cveys.fsf@kopusha.home.net> References: <4FF32FC4.6020701@delphij.net> <86wr2kau38.fsf@in138.ua3> <4FF5E87C.2020908@delphij.net> <86r4sqasrt.fsf@kopusha.home.net> <672D93D3-D4B1-432E-AE53-98E6C05B8BE4@lists.zabbadoz.net> <86zk7da10y.fsf@in138.ua3> <E909B0C0-F4DE-4110-B151-98FAC9330B82@lists.zabbadoz.net> <86obnqq94x.fsf@kopusha.home.net> <50CFED43-7789-4F27-9EC7-85268B7F23D4@lists.zabbadoz.net> <86liit8ocs.fsf@in138.ua3> <A8594672-5F62-4809-BBE7-7C2C3FAFE3C3@lists.zabbadoz.net> <86wr2cveys.fsf@kopusha.home.net>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 07/09/12 13:47, Mikolaj Golub wrote: > > On Mon, 9 Jul 2012 06:07:05 +0000 Bjoern A. Zeeb wrote: > > BAZ> On 9. Jul 2012, at 06:01 , Mikolaj Golub wrote: > >>> >>> On Sun, 8 Jul 2012 20:52:55 +0000 Bjoern A. Zeeb wrote: >>> >>> BAZ> Situation 1) >>> >>> BAZ> epairNa is in base, eiparNb is jail foo BAZ> >>> stop jail foo: jail -r foo BAZ> both epairN[ab] will >>> live in base and can be destiryed without vnet switching >>> >>> BAZ> Situation 2) >>> >>> BAZ> epairNa is in base, eiparNb is jail foo BAZ> >>> you are in jail foo and type epairNb destroy; that should not >>> be allowed >>> >>> BAZ> Situation 3) >>> >>> BAZ> epairNa is in base, eiparNb is jail foo BAZ> >>> you are in base and type ifconfig epairNa destroy >>> >>> BAZ> This is your case ... I am not sure what I'd >>> expect in this case, BAZ> especailly given epair is >>> special... You probably are right. BAZ> Ideally I'd >>> not allow it to be destroyed unless both are in the BAZ> >>> if_home_vnet. However it seems we allow this; so in that case >>> BAZ> I definitively make sure to use the >>> CURVNET_SET_QUIET() version BAZ> to avoid the expected >>> noise otherwise. >>> >>> It looks like epair was expected to allow this, because in >>> non-patched version it already did switching before freeing the >>> interface. It just did not switch bere detaching. >>> >>> CURVNET_SET_QUIET() is used in the current version of the patch >>> so I suppose I can commit it. >>> >>> But if you think that just not allowing to destroy unless both >>> ends are in the f_home_vnet is a preferred solution and it is >>> not late to change this I can provide the patch. > > BAZ> Get it in for now; it helps people. We should keep the other > things in mind and BAZ> write down a proper policy; it's more > interesting as you can do other things with BAZ> cloners you can > create inside a vnet as well, today and later. > > Thank you for the discussion. The patch is committed. Thanks! Cheers, - -- Xin LI <delphij@delphij.net> https://www.delphij.net/ FreeBSD - The Power to Serve! Live free or die -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iQEcBAEBCAAGBQJP+0R/AAoJEG80Jeu8UPuzhdUIAKYXIbwMSxEMmtqZVcLuWXqx 50f/ni+zkXkGgECMGclWcD5jDwJCCPBsUPg1aOl35pXlVZEKQY+gbMU53olz83fn vkRZmS6PBPYgYY/vT0W8EmCk1Sb/DeGVnrltVPnHxOkQkcV6u0c8xzxxX36H7hFl oJDYq3bXfEOQTlJYQHt42oPtJrPyAlG+yCQSIp2YbxZhlU+jF2qakG1FyqrP9jX8 rQAcfw0uLKGcI1JBfhzcW635CFVlTQZCkLWi//Djb0Wo/YgXpKD9fGWA54iN8qEm bd6Io7w9vF6otk0JEkmySYEvAceOx0Ae8M8oMm+q4abUYnOJZtNyYul7IhGDkVM= =Yr4X -----END PGP SIGNATURE-----
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