From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailgw-01.dd24.net ([193.46.215.41]:59837 "EHLO mailgw-01.dd24.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754114AbbLRA4Y (ORCPT ); Thu, 17 Dec 2015 19:56:24 -0500 Message-ID: <1450400180.6498.38.camel@scientia.net> Subject: Re: attacking btrfs filesystems via UUID collisions? From: Christoph Anton Mitterer To: Duncan <1i5t5.duncan@cox.net>, linux-btrfs@vger.kernel.org Date: Fri, 18 Dec 2015 01:56:20 +0100 In-Reply-To: References: <5668A1CB.1020007@anonym.com> <1449872498.31388.74.camel@fo> <1450052868.30943.27.camel@scientia.net> <566EC2D7.3000101@gmail.com> <56701B79.8030105@gmail.com> <20151215141813.GG26782@carfax.org.uk> <1450267418.6259.11.camel@scientia.net> <20151216144132.GE6322@ret.masoncoding.com> <1450278243.5570.10.camel@scientia.net> Content-Type: multipart/signed; micalg="sha-512"; protocol="application/x-pkcs7-signature"; boundary="=-ED/dDHvwa+MumGlmHUiw" Mime-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org List-ID: --=-ED/dDHvwa+MumGlmHUiw Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2015-12-17 at 03:25 +0000, Duncan wrote: > So it's definitely _not_ something that reiserfsck would do in a > "normal"=C2=A0 > fsck, only when doing "I'm desperate and don't have backups, go to > the=C2=A0 > ends of the earth if necessary to recover what you can of my data, > and=C2=A0 > yes, I understand it could be a bit risky or end up rather > disordered,=C2=A0 > but I'm willing to take that risk because I _am_ that desperate", > level=C2=A0 > recovery. Well, as long as that was/is clearly documented (which in the btrfs would need to include any warnings about issues with multi-dev, if any), then it's IMHO completely okay. :) Cheers, Chris. --=-ED/dDHvwa+MumGlmHUiw Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCCEZIw ggW/MIIDp6ADAgECAgMCOakwDQYJKoZIhvcNAQENBQAwVDEUMBIGA1UEChMLQ0FjZXJ0IEluYy4x HjAcBgNVBAsTFWh0dHA6Ly93d3cuQ0FjZXJ0Lm9yZzEcMBoGA1UEAxMTQ0FjZXJ0IENsYXNzIDMg Um9vdDAeFw0xNDA2MTIxNjM2MThaFw0xNjA2MTExNjM2MThaMHwxITAfBgNVBAMTGENocmlzdG9w aCBBbnRvbiBNaXR0ZXJlcjEkMCIGCSqGSIb3DQEJARYVY2FsZXN0eW9Ac2NpZW50aWEubmV0MTEw LwYJKoZIhvcNAQkBFiJtYWlsQGNocmlzdG9waC5hbnRvbi5taXR0ZXJlci5uYW1lMIIBIjANBgkq hkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4phP/j9vT9dZT+k3ffHxvRWMOuzBnu5O3Fl4y2+WL7pL rfLiEhWzGXhHvjSqpt4vCNSdqy43453nnu8+hMb+uEtqSIL1AHU5eLhuDNVN9S4bt9E7nA2WKYBU 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