cve-2024-49885
Vulnerability from cvelistv5
Published
2024-10-21 18:01
Modified
2024-12-19 09:28
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mm, slub: avoid zeroing kmalloc redzone Since commit 946fa0dbf2d8 ("mm/slub: extend redzone check to extra allocated kmalloc space than requested"), setting orig_size treats the wasted space (object_size - orig_size) as a redzone. However with init_on_free=1 we clear the full object->size, including the redzone. Additionally we clear the object metadata, including the stored orig_size, making it zero, which makes check_object() treat the whole object as a redzone. These issues lead to the following BUG report with "slub_debug=FUZ init_on_free=1": [ 0.000000] ============================================================================= [ 0.000000] BUG kmalloc-8 (Not tainted): kmalloc Redzone overwritten [ 0.000000] ----------------------------------------------------------------------------- [ 0.000000] [ 0.000000] 0xffff000010032858-0xffff00001003285f @offset=2136. First byte 0x0 instead of 0xcc [ 0.000000] FIX kmalloc-8: Restoring kmalloc Redzone 0xffff000010032858-0xffff00001003285f=0xcc [ 0.000000] Slab 0xfffffdffc0400c80 objects=36 used=23 fp=0xffff000010032a18 flags=0x3fffe0000000200(workingset|node=0|zone=0|lastcpupid=0x1ffff) [ 0.000000] Object 0xffff000010032858 @offset=2136 fp=0xffff0000100328c8 [ 0.000000] [ 0.000000] Redzone ffff000010032850: cc cc cc cc cc cc cc cc ........ [ 0.000000] Object ffff000010032858: cc cc cc cc cc cc cc cc ........ [ 0.000000] Redzone ffff000010032860: cc cc cc cc cc cc cc cc ........ [ 0.000000] Padding ffff0000100328b4: 00 00 00 00 00 00 00 00 00 00 00 00 ............ [ 0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.0-rc3-next-20240814-00004-g61844c55c3f4 #144 [ 0.000000] Hardware name: NXP i.MX95 19X19 board (DT) [ 0.000000] Call trace: [ 0.000000] dump_backtrace+0x90/0xe8 [ 0.000000] show_stack+0x18/0x24 [ 0.000000] dump_stack_lvl+0x74/0x8c [ 0.000000] dump_stack+0x18/0x24 [ 0.000000] print_trailer+0x150/0x218 [ 0.000000] check_object+0xe4/0x454 [ 0.000000] free_to_partial_list+0x2f8/0x5ec To address the issue, use orig_size to clear the used area. And restore the value of orig_size after clear the remaining area. When CONFIG_SLUB_DEBUG not defined, (get_orig_size()' directly returns s->object_size. So when using memset to init the area, the size can simply be orig_size, as orig_size returns object_size when CONFIG_SLUB_DEBUG not enabled. And orig_size can never be bigger than object_size.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/59090e479ac78ae18facd4c58eb332562a23020ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a2e823a19746d54052c625faecf0d2d6c52ee0aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/83f0440b2f92227fcce9898118ca7fe7e0d64b1fPatch
Impacted products
Vendor Product Version
Linux Linux Version: 946fa0dbf2d8923a587f7348adf16563d59f1b3d
Version: 946fa0dbf2d8923a587f7348adf16563d59f1b3d
Version: 946fa0dbf2d8923a587f7348adf16563d59f1b3d
 Create a notification for this product.
   Linux Linux Version: 6.2
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                "timestamp": "2024-10-22T13:45:07.682094Z",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm, slub: avoid zeroing kmalloc redzone\n\nSince commit 946fa0dbf2d8 (\"mm/slub: extend redzone check to extra\nallocated kmalloc space than requested\"), setting orig_size treats\nthe wasted space (object_size - orig_size) as a redzone. However with\ninit_on_free=1 we clear the full object-\u003esize, including the redzone.\n\nAdditionally we clear the object metadata, including the stored orig_size,\nmaking it zero, which makes check_object() treat the whole object as a\nredzone.\n\nThese issues lead to the following BUG report with \"slub_debug=FUZ\ninit_on_free=1\":\n\n[    0.000000] =============================================================================\n[    0.000000] BUG kmalloc-8 (Not tainted): kmalloc Redzone overwritten\n[    0.000000] -----------------------------------------------------------------------------\n[    0.000000]\n[    0.000000] 0xffff000010032858-0xffff00001003285f @offset=2136. First byte 0x0 instead of 0xcc\n[    0.000000] FIX kmalloc-8: Restoring kmalloc Redzone 0xffff000010032858-0xffff00001003285f=0xcc\n[    0.000000] Slab 0xfffffdffc0400c80 objects=36 used=23 fp=0xffff000010032a18 flags=0x3fffe0000000200(workingset|node=0|zone=0|lastcpupid=0x1ffff)\n[    0.000000] Object 0xffff000010032858 @offset=2136 fp=0xffff0000100328c8\n[    0.000000]\n[    0.000000] Redzone  ffff000010032850: cc cc cc cc cc cc cc cc                          ........\n[    0.000000] Object   ffff000010032858: cc cc cc cc cc cc cc cc                          ........\n[    0.000000] Redzone  ffff000010032860: cc cc cc cc cc cc cc cc                          ........\n[    0.000000] Padding  ffff0000100328b4: 00 00 00 00 00 00 00 00 00 00 00 00              ............\n[    0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.0-rc3-next-20240814-00004-g61844c55c3f4 #144\n[    0.000000] Hardware name: NXP i.MX95 19X19 board (DT)\n[    0.000000] Call trace:\n[    0.000000]  dump_backtrace+0x90/0xe8\n[    0.000000]  show_stack+0x18/0x24\n[    0.000000]  dump_stack_lvl+0x74/0x8c\n[    0.000000]  dump_stack+0x18/0x24\n[    0.000000]  print_trailer+0x150/0x218\n[    0.000000]  check_object+0xe4/0x454\n[    0.000000]  free_to_partial_list+0x2f8/0x5ec\n\nTo address the issue, use orig_size to clear the used area. And restore\nthe value of orig_size after clear the remaining area.\n\nWhen CONFIG_SLUB_DEBUG not defined, (get_orig_size()\u0027 directly returns\ns-\u003eobject_size. So when using memset to init the area, the size can simply\nbe orig_size, as orig_size returns object_size when CONFIG_SLUB_DEBUG not\nenabled. And orig_size can never be bigger than object_size."
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          "url": "https://git.kernel.org/stable/c/59090e479ac78ae18facd4c58eb332562a23020e"
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    "cveId": "CVE-2024-49885",
    "datePublished": "2024-10-21T18:01:22.186Z",
    "dateReserved": "2024-10-21T12:17:06.022Z",
    "dateUpdated": "2024-12-19T09:28:21.307Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-49885\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T18:15:11.230\",\"lastModified\":\"2024-11-13T14:36:33.207\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm, slub: avoid zeroing kmalloc redzone\\n\\nSince commit 946fa0dbf2d8 (\\\"mm/slub: extend redzone check to extra\\nallocated kmalloc space than requested\\\"), setting orig_size treats\\nthe wasted space (object_size - orig_size) as a redzone. However with\\ninit_on_free=1 we clear the full object-\u003esize, including the redzone.\\n\\nAdditionally we clear the object metadata, including the stored orig_size,\\nmaking it zero, which makes check_object() treat the whole object as a\\nredzone.\\n\\nThese issues lead to the following BUG report with \\\"slub_debug=FUZ\\ninit_on_free=1\\\":\\n\\n[    0.000000] =============================================================================\\n[    0.000000] BUG kmalloc-8 (Not tainted): kmalloc Redzone overwritten\\n[    0.000000] -----------------------------------------------------------------------------\\n[    0.000000]\\n[    0.000000] 0xffff000010032858-0xffff00001003285f @offset=2136. First byte 0x0 instead of 0xcc\\n[    0.000000] FIX kmalloc-8: Restoring kmalloc Redzone 0xffff000010032858-0xffff00001003285f=0xcc\\n[    0.000000] Slab 0xfffffdffc0400c80 objects=36 used=23 fp=0xffff000010032a18 flags=0x3fffe0000000200(workingset|node=0|zone=0|lastcpupid=0x1ffff)\\n[    0.000000] Object 0xffff000010032858 @offset=2136 fp=0xffff0000100328c8\\n[    0.000000]\\n[    0.000000] Redzone  ffff000010032850: cc cc cc cc cc cc cc cc                          ........\\n[    0.000000] Object   ffff000010032858: cc cc cc cc cc cc cc cc                          ........\\n[    0.000000] Redzone  ffff000010032860: cc cc cc cc cc cc cc cc                          ........\\n[    0.000000] Padding  ffff0000100328b4: 00 00 00 00 00 00 00 00 00 00 00 00              ............\\n[    0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.0-rc3-next-20240814-00004-g61844c55c3f4 #144\\n[    0.000000] Hardware name: NXP i.MX95 19X19 board (DT)\\n[    0.000000] Call trace:\\n[    0.000000]  dump_backtrace+0x90/0xe8\\n[    0.000000]  show_stack+0x18/0x24\\n[    0.000000]  dump_stack_lvl+0x74/0x8c\\n[    0.000000]  dump_stack+0x18/0x24\\n[    0.000000]  print_trailer+0x150/0x218\\n[    0.000000]  check_object+0xe4/0x454\\n[    0.000000]  free_to_partial_list+0x2f8/0x5ec\\n\\nTo address the issue, use orig_size to clear the used area. And restore\\nthe value of orig_size after clear the remaining area.\\n\\nWhen CONFIG_SLUB_DEBUG not defined, (get_orig_size()\u0027 directly returns\\ns-\u003eobject_size. So when using memset to init the area, the size can simply\\nbe orig_size, as orig_size returns object_size when CONFIG_SLUB_DEBUG not\\nenabled. And orig_size can never be bigger than object_size.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm, slub: evitar poner a cero la zona roja de kmalloc Desde el commit 946fa0dbf2d8 (\\\"mm/slub: extender la comprobaci\u00f3n de la zona roja a espacio de kmalloc asignado adicional al solicitado\\\"), al establecer orig_size se trata el espacio desperdiciado (object_size - orig_size) como una zona roja. Sin embargo, con init_on_free=1 borramos todo el objeto-\u0026gt;size, incluida la zona roja. Adem\u00e1s, borramos los metadatos del objeto, incluido el orig_size almacenado, haci\u00e9ndolo cero, lo que hace que check_object() trate todo el objeto como una zona roja. Estos problemas conducen al siguiente informe de ERROR con \\\"slub_debug=FUZ init_on_free=1\\\": [ 0.000000] ===================================================================================== [ 0.000000] ERROR kmalloc-8 (no contaminado): kmalloc Redzone sobrescrito [ 0.000000] ----------------------------------------------------------------------------- [ 0.000000] [ 0.000000] 0xffff000010032858-0xffff00001003285f @offset=2136. Primer byte 0x0 en lugar de 0xcc [ 0.000000] CORREGIR kmalloc-8: Restaurando kmalloc Redzone 0xffff000010032858-0xffff00001003285f=0xcc [ 0.000000] Losa 0xfffffdffc0400c80 objetos=36 usados=23 fp=0xffff000010032a18 indicadores=0x3fffe0000000200(workingset|node=0|zone=0|lastcpupid=0x1ffff) [ 0.000000] Objeto 0xffff000010032858 @offset=2136 fp=0xffff0000100328c8 [ 0.000000] [ 0.000000] Redzone ffff000010032850: cc cc cc cc cc cc cc cc ........ [ 0.000000] Objeto ffff000010032858: cc cc cc cc cc cc cc cc cc ........ [ 0.000000] Redzone ffff000010032860: cc cc cc cc cc cc cc cc cc ........ [ 0.000000] Relleno ffff0000100328b4: 00 00 00 00 00 00 00 00 00 00 00 00 ............ [ 0.000000] CPU: 0 UID: 0 PID: 0 Comm: intercambiador/0 No contaminado 6.11.0-rc3-next-20240814-00004-g61844c55c3f4 #144 [ 0.000000] Nombre del hardware: Placa NXP i.MX95 19X19 (DT) [ 0.000000] Rastreo de llamadas: [ 0.000000] dump_backtrace+0x90/0xe8 [ 0.000000] show_stack+0x18/0x24 [ 0.000000] dump_stack_lvl+0x74/0x8c [ 0.000000] dump_stack+0x18/0x24 [ 0.000000] print_trailer+0x150/0x218 [ 0.000000] check_object+0xe4/0x454 [ 0.000000] free_to_partial_list+0x2f8/0x5ec Para solucionar el problema, use orig_size para limpiar el \u00e1rea usada. Y restaure el valor de orig_size despu\u00e9s de limpiar el \u00e1rea restante. Cuando CONFIG_SLUB_DEBUG no est\u00e1 definido, (get_orig_size()\u0027 retorna directamente s-\u0026gt;object_size. Entonces, cuando se usa memset para inicializar el \u00e1rea, el tama\u00f1o puede ser simplemente orig_size, ya que orig_size retorna object_size cuando CONFIG_SLUB_DEBUG no est\u00e1 habilitado. Y orig_size nunca puede ser mayor que object_size.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.10.14\",\"matchCriteriaId\":\"1337614F-3988-4131-AE51-21C855695DE3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11\",\"versionEndExcluding\":\"6.11.3\",\"matchCriteriaId\":\"54D9C704-D679-41A7-9C40-10A6B1E7FFE9\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/59090e479ac78ae18facd4c58eb332562a23020e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7a2e823a19746d54052c625faecf0d2d6c52ee0a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/83f0440b2f92227fcce9898118ca7fe7e0d64b1f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-49885\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:45:07.682094Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:45:10.780Z\"}}], \"cna\": {\"title\": \"mm, slub: avoid zeroing kmalloc redzone\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"946fa0dbf2d8923a587f7348adf16563d59f1b3d\", \"lessThan\": \"7a2e823a19746d54052c625faecf0d2d6c52ee0a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"946fa0dbf2d8923a587f7348adf16563d59f1b3d\", \"lessThan\": \"83f0440b2f92227fcce9898118ca7fe7e0d64b1f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"946fa0dbf2d8923a587f7348adf16563d59f1b3d\", \"lessThan\": \"59090e479ac78ae18facd4c58eb332562a23020e\", \"versionType\": \"git\"}], \"programFiles\": [\"mm/slub.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.2\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.10.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"mm/slub.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/7a2e823a19746d54052c625faecf0d2d6c52ee0a\"}, {\"url\": \"https://git.kernel.org/stable/c/83f0440b2f92227fcce9898118ca7fe7e0d64b1f\"}, {\"url\": \"https://git.kernel.org/stable/c/59090e479ac78ae18facd4c58eb332562a23020e\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm, slub: avoid zeroing kmalloc redzone\\n\\nSince commit 946fa0dbf2d8 (\\\"mm/slub: extend redzone check to extra\\nallocated kmalloc space than requested\\\"), setting orig_size treats\\nthe wasted space (object_size - orig_size) as a redzone. However with\\ninit_on_free=1 we clear the full object-\u003esize, including the redzone.\\n\\nAdditionally we clear the object metadata, including the stored orig_size,\\nmaking it zero, which makes check_object() treat the whole object as a\\nredzone.\\n\\nThese issues lead to the following BUG report with \\\"slub_debug=FUZ\\ninit_on_free=1\\\":\\n\\n[    0.000000] =============================================================================\\n[    0.000000] BUG kmalloc-8 (Not tainted): kmalloc Redzone overwritten\\n[    0.000000] -----------------------------------------------------------------------------\\n[    0.000000]\\n[    0.000000] 0xffff000010032858-0xffff00001003285f @offset=2136. First byte 0x0 instead of 0xcc\\n[    0.000000] FIX kmalloc-8: Restoring kmalloc Redzone 0xffff000010032858-0xffff00001003285f=0xcc\\n[    0.000000] Slab 0xfffffdffc0400c80 objects=36 used=23 fp=0xffff000010032a18 flags=0x3fffe0000000200(workingset|node=0|zone=0|lastcpupid=0x1ffff)\\n[    0.000000] Object 0xffff000010032858 @offset=2136 fp=0xffff0000100328c8\\n[    0.000000]\\n[    0.000000] Redzone  ffff000010032850: cc cc cc cc cc cc cc cc                          ........\\n[    0.000000] Object   ffff000010032858: cc cc cc cc cc cc cc cc                          ........\\n[    0.000000] Redzone  ffff000010032860: cc cc cc cc cc cc cc cc                          ........\\n[    0.000000] Padding  ffff0000100328b4: 00 00 00 00 00 00 00 00 00 00 00 00              ............\\n[    0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.0-rc3-next-20240814-00004-g61844c55c3f4 #144\\n[    0.000000] Hardware name: NXP i.MX95 19X19 board (DT)\\n[    0.000000] Call trace:\\n[    0.000000]  dump_backtrace+0x90/0xe8\\n[    0.000000]  show_stack+0x18/0x24\\n[    0.000000]  dump_stack_lvl+0x74/0x8c\\n[    0.000000]  dump_stack+0x18/0x24\\n[    0.000000]  print_trailer+0x150/0x218\\n[    0.000000]  check_object+0xe4/0x454\\n[    0.000000]  free_to_partial_list+0x2f8/0x5ec\\n\\nTo address the issue, use orig_size to clear the used area. And restore\\nthe value of orig_size after clear the remaining area.\\n\\nWhen CONFIG_SLUB_DEBUG not defined, (get_orig_size()\u0027 directly returns\\ns-\u003eobject_size. So when using memset to init the area, the size can simply\\nbe orig_size, as orig_size returns object_size when CONFIG_SLUB_DEBUG not\\nenabled. And orig_size can never be bigger than object_size.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T09:28:21.307Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-49885\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T09:28:21.307Z\", \"dateReserved\": \"2024-10-21T12:17:06.022Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:01:22.186Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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