cve-2024-42305
Vulnerability from cvelistv5
Published
2024-08-17 09:09
Modified
2025-05-04 09:26
Severity ?
EPSS score ?
Summary
ext4: check dot and dotdot of dx_root before making dir indexed
References
{
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"id": "CVE-2024-42305",
"options": [
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"Automatable": "no"
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"Technical Impact": "partial"
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"role": "CISA Coordinator",
"timestamp": "2024-09-10T16:10:19.161352Z",
"version": "2.0.3"
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"shortName": "CISA-ADP"
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"version": "6.1.103",
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"version": "6.6.44",
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{
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"version": "6.10.3",
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{
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"version": "6.11",
"versionType": "original_commit_for_fix"
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"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 \u003cTASK\u003e\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 ---\u003e 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\u0027s 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\u0027s 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."
}
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"providerMetadata": {
"dateUpdated": "2025-05-04T09:26:23.871Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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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",
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-42305",
"datePublished": "2024-08-17T09:09:11.296Z",
"dateReserved": "2024-07-30T07:40:12.273Z",
"dateUpdated": "2025-05-04T09:26:23.871Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2024-42305\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-08-17T09:15:10.690\",\"lastModified\":\"2024-08-19T12:59:59.177\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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 \u003cTASK\u003e\\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 ---\u003e 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\u0027s 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\u0027s 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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: verifique el punto y el punto de dx_root antes de indexar el directorio Syzbot informa un problema de la siguiente manera: =================== ========================= ERROR: no se puede manejar el error de p\u00e1gina para la direcci\u00f3n: ffffed11022e24fe PGD 23ffee067 P4D 23ffee067 PUD 0 Ups: Ups: 0000 [#1 ] PREEMPT SMP KASAN PTI CPU: 0 PID: 5079 Comm: syz-executor306 No contaminado 6.10.0-rc5-g55027e689933 #0 Seguimiento de llamada: make_indexed_dir+0xdaf/0x13c0 fs/ext4/namei.c:2341 ext4_add_entry+0x222 un /0x25d0 fs/ext4/namei.c:2451 ext4_rename fs/ext4/namei.c:3936 [en l\u00ednea] text4_rename2+0x26e5/0x4370 fs/ext4/namei.c:4214 [...] ======= ====================================== La causa inmediata de este problema es que s\u00f3lo hay una v\u00e1lida dentry para que el bloque se divida durante do_split, por lo que split==0 da como resultado accesos fuera de los l\u00edmites al mapa que desencadenan el problema. do_split divisi\u00f3n sin signo dx_make_map recuento = 1 divisi\u00f3n = recuento/2 = 0; contin\u00faa = hash2 == mapa[dividido - 1].hash; ---\u0026gt; map[4294967295] La longitud m\u00e1xima de un nombre de archivo es 255 y el tama\u00f1o m\u00ednimo de bloque es 1024, por lo que siempre se garantiza que el n\u00famero de entradas sea mayor o igual a 2 cuando se llama a do_split(). Pero la imagen manipulada por syzbot no tiene punto ni puntopunto en el directorio, y la distribuci\u00f3n de dentry en dirblock es la siguiente: bus dentry1 agujero dentry2 gratis |xx--|xx-------------|... ............|xx-------------|...............| 0 12 (8+248)=256 268 256 524 (8+256)=264 788 236 1024 Entonces, cuando se cambia el nombre de dentry1 se aumenta la longitud de name_len en 1, ni el agujero ni el espacio libre son suficientes para contener el nuevo dentry, y make_indexed_dir() es llamado. En make_indexed_dir() se supone que las dos primeras entradas del bloque de directorios deben ser punto y puntopunto, por lo que bus y dentry1 se dejan en dx_root porque se tratan como punto y puntodot, y solo dentry2 se mueve al nuevo bloque de hoja. Es por eso que el recuento es igual a 1. Por lo tanto, agregue la funci\u00f3n auxiliar ext4_check_dx_root() para agregar m\u00e1s controles de cordura a los puntos y puntos antes de comenzar la conversi\u00f3n para evitar el problema anterior.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/19e13b4d7f0303186fcc891aba8d0de7c8fdbda8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/42d420517072028fb0eb852c358056b7717ba5aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/50ea741def587a64e08879ce6c6a30131f7111e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8afe06ed3be7a874b3cd82ef5f8959aca8d6429a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9d241b7a39af192d1bb422714a458982c7cc67a2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/abb411ac991810c0bcbe51c2e76d2502bf611b5c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b80575ffa98b5bb3a5d4d392bfe4c2e03e9557db\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cdd345321699042ece4a9d2e70754d2397d378c5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.