{"id":54770,"date":"2023-12-05T14:26:09","date_gmt":"2023-12-05T14:26:09","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/35267\/Two-New-Versions-Of-OpenZFS-Fix-Long-Hidden-Corruption-Bug.html"},"modified":"2023-12-05T14:26:09","modified_gmt":"2023-12-05T14:26:09","slug":"two-new-versions-of-openzfs-fix-long-hidden-corruption-bug","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/two-new-versions-of-openzfs-fix-long-hidden-corruption-bug\/","title":{"rendered":"Two New Versions Of OpenZFS Fix Long-Hidden Corruption Bug"},"content":{"rendered":"<p>The bug that was very occasionally corrupting data on file copies in OpenZFS 2.2.0 has been identified and fixed, and there&#8217;s a fix for the previous OpenZFS release too.<\/p>\n<p>The OpenZFS development team have put out not one but two new releases of the open-source cross-platform filesystem for Linux and FreeBSD. <a href=\"https:\/\/github.com\/openzfs\/zfs\/releases\/tag\/zfs-2.2.2\" rel=\"nofollow\">Version 2.2.2<\/a> fixes the problem that showed up in the latest version, which is included in FreeBSD 14 as well as several Linux distros, including Ubuntu 23.10. There&#8217;s also a new release in the previous version of OpenZFS: <a href=\"https:\/\/github.com\/openzfs\/zfs\/releases\/tag\/zfs-2.1.14\" rel=\"nofollow\">version 2.1.14<\/a> which applies to FreeBSD back to version 12.<\/p>\n<p>This was necessary because while, as we <a href=\"https:\/\/www.theregister.com\/2023\/11\/27\/openzfs_2_2_0_data_corruption\/\">reported a week ago<\/a>, it was OpenZFS 2.2.0 that brought the issue to light and made it visible, it didn&#8217;t actually <em>cause<\/em> the problem. It merely exposed an underlying bug which had been around for years: OpenZFS 2.2.0&#8217;s new, faster copy function simply made the existing issue much more likely to happen. The FreeBSD project has <a href=\"https:\/\/www.freebsd.org\/security\/advisories\/FreeBSD-EN-23:16.openzfs.asc\" rel=\"nofollow\">published an errata notice<\/a>, and made fixes available for FreeBSD 12, 13 and 14.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"condor\" data-xsm=\",fluid,mpu,\" data-sm=\",fluid,mpu,\" data-md=\",fluid,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2ZW-F3uF1F3UyI7DthiQltwAAANM&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2ZW-F3uF1F3UyI7DthiQltwAAANM&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>The investigation that&#8217;s been going on since then has revealed more. For instance, the bug was also <a href=\"https:\/\/www.illumos.org\/issues\/16087\" rel=\"nofollow\">confirmed<\/a> in Illumos, the open-source fork of OpenSolaris which has continued development since <a href=\"https:\/\/www.theregister.com\/2010\/08\/13\/opensolaris_is_dead\/\">Oracle killed off the open source project<\/a> in 2010. Illumos is itself the basis of <a href=\"https:\/\/www.theregister.com\/2022\/12\/07\/new_version_of_openindiana\/\">several OpenSolaris-based distributions<\/a>.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xmd=\",fluid,mpu,leaderboard,\" data-lg=\",fluid,mpu,leaderboard,\" data-xlg=\",fluid,billboard,superleaderboard,mpu,leaderboard,\" data-xxlg=\",fluid,billboard,superleaderboard,brandwidth,brandimpact,leaderboard,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZW-F3uF1F3UyI7DthiQltwAAANM&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZW-F3uF1F3UyI7DthiQltwAAANM&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<div class=\"adun_eagle_desktop_story_wrapper\">\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"mid\" data-raptor=\"eagle\" data-xxlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33ZW-F3uF1F3UyI7DthiQltwAAANM&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33ZW-F3uF1F3UyI7DthiQltwAAANM&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p>As amendments in the release notes for both these versions clarify, it&#8217;s also slightly worse than it looked last week, when we wrote that:<\/p>\n<blockquote readability=\"7\">\n<p>For Linux users, an additional condition seems to be that the OS has a recent version of the <code>coreutils<\/code> package \u2013 above version 9.x.<\/p>\n<\/blockquote>\n<p>This looked to be the case because the <code>cp<\/code> command in Coretils 9 was updated to look for ways to speed up file copies, such as checking for &#8220;holes&#8221; in files \u2013 long stretches of zeroes \u2013 called the <a href=\"https:\/\/lwn.net\/Articles\/440255\/\" rel=\"nofollow\">SEEK_HOLE optimization<\/a>. Unfortunately, it looks like Red Hat backported this functionality from Coreutils 9.x to 8.x, and it&#8217;s <a href=\"https:\/\/github.com\/openzfs\/zfs\/issues\/15526#issuecomment-1835465225\" rel=\"nofollow\">been identified<\/a> in CentOS Stream 9 as well as in the <a href=\"https:\/\/gitlab.com\/redhat\/centos-stream\/rpms\/coreutils\/-\/blob\/c9s\/coreutils-8.32-cp-file-range.patch?ref_type=heads\" rel=\"nofollow\">OpenELA source code<\/a>. As the code comment dryly says:<\/p>\n<blockquote readability=\"6\">\n<p>I&#8217;d link to the corresponding RHEL code, but sadly they no longer publish it.<\/p>\n<\/blockquote>\n<p>RHEL doesn&#8217;t include OpenZFS, so this data-loss issue will not affect it. Indeed, RHEL <a href=\"https:\/\/www.theregister.com\/2017\/08\/16\/red_hat_banishes_btrfs_from_rhel\/\">doesn&#8217;t even include Btrfs<\/a>\u2026 but <a href=\"https:\/\/www.theregister.com\/2022\/07\/12\/oracle_linux_9\/\">Oracle Linux does<\/a>, although that&#8217;s no cause for concern here: Btrfs itself is immune from the bug.<\/p>\n<p>What this illustrates, though, is the problem with trying to pin down affected versions. As we <a href=\"https:\/\/www.theregister.com\/2023\/06\/30\/enterprise_distro_feature_devconf\/\">described back in June<\/a>, Red Hat puts a lot of engineering time and effort into backporting features from newer kernels into its very-long-term supported enterprise kernels. Sometimes, these backports may not be limited to the kernel: they may extend to non-kernel system utilities. These optimizations are perfectly safe on the Big Purple Hat&#8217;s own distro, and indeed its RHELatives such as Oracle and Alma and so on. However, such changes can get picked up by other distros, or even by people hand-building complex bespoke installations. The result is that it&#8217;s not safe to simply say <em>&#8220;this only affects systems with coreutils 9 or above&#8221;<\/em>.<\/p>\n<p>At any rate, for now, the issue is fixed. There&#8217;s a newer <a href=\"https:\/\/gist.github.com\/rincebrain\/e23b4a39aba3fadc04db18574d30dc73\" rel=\"nofollow\">overview of the issue<\/a> on Github, but the investigation as to when the bug first appeared is still underway, as the comments there show (along with a link to our earlier story).<\/p>\n<p>The bug might go back as far as 2006. Although <a href=\"https:\/\/github.com\/openzfs\/zfs\/pull\/15571\" rel=\"nofollow\">bug fix #15571<\/a> in these two new OpenZFS releases does resolve the issue, another, newer attempt to fix the issue in a cleaner way is <em>also<\/em> under investigation as <a href=\"https:\/\/github.com\/openzfs\/zfs\/pull\/15615\" rel=\"nofollow\">bug fix #15615<\/a>. ZFS is a complex filesystem, and this is a complex bug that may have remained hidden for 17 years. If there is a simpler, cleaner way to fix the issue, that would be a good thing.<\/p>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/35267\/Two-New-Versions-Of-OpenZFS-Fix-Long-Hidden-Corruption-Bug.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[1011],"class_list":["post-54770","post","type-post","status-publish","format-standard","hentry","category-packet-storm","tag-headlineflawpatch"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Two New Versions Of OpenZFS Fix Long-Hidden Corruption Bug 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub 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