| { |
| "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: check dot and dotdot of dx_root before making dir indexed\n\nSyzbot reports a issue as follows:\n============================================\nBUG: unable to handle page fault for address: ffffed11022e24fe\nPGD 23ffee067 P4D 23ffee067 PUD 0\nOops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI\nCPU: 0 PID: 5079 Comm: syz-executor306 Not tainted 6.10.0-rc5-g55027e689933 #0\nCall Trace:\n <TASK>\n make_indexed_dir+0xdaf/0x13c0 fs/ext4/namei.c:2341\n ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2451\n ext4_rename fs/ext4/namei.c:3936 [inline]\n ext4_rename2+0x26e5/0x4370 fs/ext4/namei.c:4214\n[...]\n============================================\n\nThe immediate cause of this problem is that there is only one valid dentry\nfor the block to be split during do_split, so split==0 results in out of\nbounds accesses to the map triggering the issue.\n\n do_split\n unsigned split\n dx_make_map\n count = 1\n split = count/2 = 0;\n continued = hash2 == map[split - 1].hash;\n ---> map[4294967295]\n\nThe maximum length of a filename is 255 and the minimum block size is 1024,\nso it is always guaranteed that the number of entries is greater than or\nequal to 2 when do_split() is called.\n\nBut syzbot's crafted image has no dot and dotdot in dir, and the dentry\ndistribution in dirblock is as follows:\n\n bus dentry1 hole dentry2 free\n|xx--|xx-------------|...............|xx-------------|...............|\n0 12 (8+248)=256 268 256 524 (8+256)=264 788 236 1024\n\nSo when renaming dentry1 increases its name_len length by 1, neither hole\nnor free is sufficient to hold the new dentry, and make_indexed_dir() is\ncalled.\n\nIn make_indexed_dir() it is assumed that the first two entries of the\ndirblock must be dot and dotdot, so bus and dentry1 are left in dx_root\nbecause they are treated as dot and dotdot, and only dentry2 is moved\nto the new leaf block. That's why count is equal to 1.\n\nTherefore add the ext4_check_dx_root() helper function to add more sanity\nchecks to dot and dotdot before starting the conversion to avoid the above\nissue." |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "fs/ext4/namei.c" |
| ], |
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| "lessThan": "b80575ffa98b5bb3a5d4d392bfe4c2e03e9557db", |
| "status": "affected", |
| "versionType": "git" |
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| "lessThan": "19e13b4d7f0303186fcc891aba8d0de7c8fdbda8", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
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| "lessThan": "42d420517072028fb0eb852c358056b7717ba5aa", |
| "status": "affected", |
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| }, |
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| "version": "ac27a0ec112a089f1a5102bc8dffc79c8c815571", |
| "lessThan": "9d241b7a39af192d1bb422714a458982c7cc67a2", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "ac27a0ec112a089f1a5102bc8dffc79c8c815571", |
| "lessThan": "cdd345321699042ece4a9d2e70754d2397d378c5", |
| "status": "affected", |
| "versionType": "git" |
| }, |
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| "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/namei.c" |
| ], |
| "versions": [ |
| { |
| "version": "2.6.19", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "2.6.19", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "4.19.320", |
| "lessThanOrEqual": "4.19.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.4.282", |
| "lessThanOrEqual": "5.4.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.224", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15.165", |
| "lessThanOrEqual": "5.15.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.1.103", |
| "lessThanOrEqual": "6.1.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.6.44", |
| "lessThanOrEqual": "6.6.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.10.3", |
| "lessThanOrEqual": "6.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.11", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
| "cpeApplicability": [ |
| { |
| "nodes": [ |
| { |
| "operator": "OR", |
| "negate": false, |
| "cpeMatch": [ |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
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| "versionEndExcluding": "4.19.320" |
| }, |
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| "vulnerable": true, |
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| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/b80575ffa98b5bb3a5d4d392bfe4c2e03e9557db" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/19e13b4d7f0303186fcc891aba8d0de7c8fdbda8" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/42d420517072028fb0eb852c358056b7717ba5aa" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/8afe06ed3be7a874b3cd82ef5f8959aca8d6429a" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/abb411ac991810c0bcbe51c2e76d2502bf611b5c" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/9d241b7a39af192d1bb422714a458982c7cc67a2" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/cdd345321699042ece4a9d2e70754d2397d378c5" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/50ea741def587a64e08879ce6c6a30131f7111e7" |
| } |
| ], |
| "title": "ext4: check dot and dotdot of dx_root before making dir indexed", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2024-42305", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
