{ "containers": { "cna": { "providerMetadata": { "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix corruption during on-line resize\n\nWe observed a corruption during on-line resize of a file system that is\nlarger than 16 TiB with 4k block size. With having more then 2^32 blocks\nresize_inode is turned off by default by mke2fs. The issue can be\nreproduced on a smaller file system for convenience by explicitly\nturning off resize_inode. An on-line resize across an 8 GiB boundary (the\nsize of a meta block group in this setup) then leads to a corruption:\n\n dev=/dev/ # should be >= 16 GiB\n mkdir -p /corruption\n /sbin/mke2fs -t ext4 -b 4096 -O ^resize_inode $dev $((2 * 2**21 - 2**15))\n mount -t ext4 $dev /corruption\n\n dd if=/dev/zero bs=4096 of=/corruption/test count=$((2*2**21 - 4*2**15))\n sha1sum /corruption/test\n # 79d2658b39dcfd77274e435b0934028adafaab11 /corruption/test\n\n /sbin/resize2fs $dev $((2*2**21))\n # drop page cache to force reload the block from disk\n echo 1 > /proc/sys/vm/drop_caches\n\n sha1sum /corruption/test\n # 3c2abc63cbf1a94c9e6977e0fbd72cd832c4d5c3 /corruption/test\n\n2^21 = 2^15*2^6 equals 8 GiB whereof 2^15 is the number of blocks per\nblock group and 2^6 are the number of block groups that make a meta\nblock group.\n\nThe last checksum might be different depending on how the file is laid\nout across the physical blocks. The actual corruption occurs at physical\nblock 63*2^15 = 2064384 which would be the location of the backup of the\nmeta block group's block descriptor. During the on-line resize the file\nsystem will be converted to meta_bg starting at s_first_meta_bg which is\n2 in the example - meaning all block groups after 16 GiB. However, in\next4_flex_group_add we might add block groups that are not part of the\nfirst meta block group yet. In the reproducer we achieved this by\nsubstracting the size of a whole block group from the point where the\nmeta block group would start. This must be considered when updating the\nbackup block group descriptors to follow the non-meta_bg layout. The fix\nis to add a test whether the group to add is already part of the meta\nblock group or not." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ext4/resize.c" ], "versions": [ { "version": "01f795f9e0d6", "lessThan": "75cc31c2e719", "status": "affected", "versionType": "git" }, { "version": "01f795f9e0d6", "lessThan": "ee4e9c197614", "status": "affected", "versionType": "git" }, { "version": "01f795f9e0d6", "lessThan": "e8e8b1973172", "status": "affected", "versionType": "git" }, { "version": "01f795f9e0d6", "lessThan": "239c669edb2b", "status": "affected", "versionType": "git" }, { "version": "01f795f9e0d6", "lessThan": "fb1088d51bba", "status": "affected", "versionType": "git" }, { "version": "01f795f9e0d6", "lessThan": "37b6a3ba793b", "status": "affected", "versionType": "git" }, { "version": "01f795f9e0d6", "lessThan": "b461910af8ba", "status": "affected", "versionType": "git" }, { "version": "01f795f9e0d6", "lessThan": "722d2c01b8b1", "status": "affected", "versionType": "git" }, { "version": "01f795f9e0d6", "lessThan": "a6b3bfe176e8", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ext4/resize.c" ], "versions": [ { "version": "3.7", "status": "affected" }, { "version": "0", "lessThan": "3.7", "status": "unaffected", "versionType": "custom" }, { "version": "4.19.312", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.4.274", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.10.215", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.15.154", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.1.84", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.6.24", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.7.12", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.8.3", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.9", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/75cc31c2e7193b69f5d25650bda5bb42ed92f8a1" }, { "url": "https://git.kernel.org/stable/c/ee4e9c1976147a850f6085a13fca95bcaa00d84c" }, { "url": "https://git.kernel.org/stable/c/e8e8b197317228b5089ed9e7802dadf3ccaa027a" }, { "url": "https://git.kernel.org/stable/c/239c669edb2bffa1aa2612519b1d438ab35d6be6" }, { "url": "https://git.kernel.org/stable/c/fb1088d51bbaa0faec5a55d4f5818a9ab79e24df" }, { "url": "https://git.kernel.org/stable/c/37b6a3ba793bbbae057f5b991970ebcc52cb3db5" }, { "url": "https://git.kernel.org/stable/c/b461910af8ba3bed80f48c2bf852686d05c6fc5c" }, { "url": "https://git.kernel.org/stable/c/722d2c01b8b108f8283d1b7222209d5b2a5aa7bd" }, { "url": "https://git.kernel.org/stable/c/a6b3bfe176e8a5b05ec4447404e412c2a3fc92cc" } ], "title": "ext4: fix corruption during on-line resize", "x_generator": { "engine": "bippy-a5840b7849dd" } } }, "cveMetadata": { "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", "cveID": "CVE-2024-35807", "requesterUserId": "gregkh@kernel.org", "serial": "1", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.0" }