cve-2024-36892
Vulnerability from cvelistv5
Published
2024-05-30 15:28
Modified
2024-12-19 09:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/slub: avoid zeroing outside-object freepointer for single free Commit 284f17ac13fe ("mm/slub: handle bulk and single object freeing separately") splits single and bulk object freeing in two functions slab_free() and slab_free_bulk() which leads slab_free() to call slab_free_hook() directly instead of slab_free_freelist_hook(). If `init_on_free` is set, slab_free_hook() zeroes the object. Afterward, if `slub_debug=F` and `CONFIG_SLAB_FREELIST_HARDENED` are set, the do_slab_free() slowpath executes freelist consistency checks and try to decode a zeroed freepointer which leads to a "Freepointer corrupt" detection in check_object(). During bulk free, slab_free_freelist_hook() isn't affected as it always sets it objects freepointer using set_freepointer() to maintain its reconstructed freelist after `init_on_free`. For single free, object's freepointer thus needs to be avoided when stored outside the object if `init_on_free` is set. The freepointer left as is, check_object() may later detect an invalid pointer value due to objects overflow. To reproduce, set `slub_debug=FU init_on_free=1 log_level=7` on the command line of a kernel build with `CONFIG_SLAB_FREELIST_HARDENED=y`. dmesg sample log: [ 10.708715] ============================================================================= [ 10.710323] BUG kmalloc-rnd-05-32 (Tainted: G B T ): Freepointer corrupt [ 10.712695] ----------------------------------------------------------------------------- [ 10.712695] [ 10.712695] Slab 0xffffd8bdc400d580 objects=32 used=4 fp=0xffff9d9a80356f80 flags=0x200000000000a00(workingset|slab|node=0|zone=2) [ 10.716698] Object 0xffff9d9a80356600 @offset=1536 fp=0x7ee4f480ce0ecd7c [ 10.716698] [ 10.716698] Bytes b4 ffff9d9a803565f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.720703] Object ffff9d9a80356600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.720703] Object ffff9d9a80356610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.724696] Padding ffff9d9a8035666c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.724696] Padding ffff9d9a8035667c: 00 00 00 00 .... [ 10.724696] FIX kmalloc-rnd-05-32: Object at 0xffff9d9a80356600 not freed
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/56900355485f6e82114b18c812edd57fd7970dcb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8f828aa48812ced28aa39cb3cfe55ef2444d03dd
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/56900355485f6e82114b18c812edd57fd7970dcb
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8f828aa48812ced28aa39cb3cfe55ef2444d03dd
Impacted products
Vendor Product Version
Linux Linux Version: 284f17ac13fe34ae9eecbe57bb91553374d9b855
Version: 284f17ac13fe34ae9eecbe57bb91553374d9b855
 Create a notification for this product.
   Linux Linux Version: 6.8
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               value: "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slub: avoid zeroing outside-object freepointer for single free\n\nCommit 284f17ac13fe (\"mm/slub: handle bulk and single object freeing\nseparately\") splits single and bulk object freeing in two functions\nslab_free() and slab_free_bulk() which leads slab_free() to call\nslab_free_hook() directly instead of slab_free_freelist_hook().\n\nIf `init_on_free` is set, slab_free_hook() zeroes the object.\nAfterward, if `slub_debug=F` and `CONFIG_SLAB_FREELIST_HARDENED` are\nset, the do_slab_free() slowpath executes freelist consistency\nchecks and try to decode a zeroed freepointer which leads to a\n\"Freepointer corrupt\" detection in check_object().\n\nDuring bulk free, slab_free_freelist_hook() isn't affected as it always\nsets it objects freepointer using set_freepointer() to maintain its\nreconstructed freelist after `init_on_free`.\n\nFor single free, object's freepointer thus needs to be avoided when\nstored outside the object if `init_on_free` is set. The freepointer left\nas is, check_object() may later detect an invalid pointer value due to\nobjects overflow.\n\nTo reproduce, set `slub_debug=FU init_on_free=1 log_level=7` on the\ncommand line of a kernel build with `CONFIG_SLAB_FREELIST_HARDENED=y`.\n\ndmesg sample log:\n[   10.708715] =============================================================================\n[   10.710323] BUG kmalloc-rnd-05-32 (Tainted: G    B           T ): Freepointer corrupt\n[   10.712695] -----------------------------------------------------------------------------\n[   10.712695]\n[   10.712695] Slab 0xffffd8bdc400d580 objects=32 used=4 fp=0xffff9d9a80356f80 flags=0x200000000000a00(workingset|slab|node=0|zone=2)\n[   10.716698] Object 0xffff9d9a80356600 @offset=1536 fp=0x7ee4f480ce0ecd7c\n[   10.716698]\n[   10.716698] Bytes b4 ffff9d9a803565f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.720703] Object   ffff9d9a80356600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.720703] Object   ffff9d9a80356610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.724696] Padding  ffff9d9a8035666c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.724696] Padding  ffff9d9a8035667c: 00 00 00 00                                      ....\n[   10.724696] FIX kmalloc-rnd-05-32: Object at 0xffff9d9a80356600 not freed",
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         title: "mm/slub: avoid zeroing outside-object freepointer for single free",
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   cveMetadata: {
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      assignerShortName: "Linux",
      cveId: "CVE-2024-36892",
      datePublished: "2024-05-30T15:28:58.528Z",
      dateReserved: "2024-05-30T15:25:07.065Z",
      dateUpdated: "2024-12-19T09:01:30.555Z",
      state: "PUBLISHED",
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   dataType: "CVE_RECORD",
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      nvd: "{\"cve\":{\"id\":\"CVE-2024-36892\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-30T16:15:12.680\",\"lastModified\":\"2024-11-21T09:22:44.947\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm/slub: avoid zeroing outside-object freepointer for single free\\n\\nCommit 284f17ac13fe (\\\"mm/slub: handle bulk and single object freeing\\nseparately\\\") splits single and bulk object freeing in two functions\\nslab_free() and slab_free_bulk() which leads slab_free() to call\\nslab_free_hook() directly instead of slab_free_freelist_hook().\\n\\nIf `init_on_free` is set, slab_free_hook() zeroes the object.\\nAfterward, if `slub_debug=F` and `CONFIG_SLAB_FREELIST_HARDENED` are\\nset, the do_slab_free() slowpath executes freelist consistency\\nchecks and try to decode a zeroed freepointer which leads to a\\n\\\"Freepointer corrupt\\\" detection in check_object().\\n\\nDuring bulk free, slab_free_freelist_hook() isn't affected as it always\\nsets it objects freepointer using set_freepointer() to maintain its\\nreconstructed freelist after `init_on_free`.\\n\\nFor single free, object's freepointer thus needs to be avoided when\\nstored outside the object if `init_on_free` is set. The freepointer left\\nas is, check_object() may later detect an invalid pointer value due to\\nobjects overflow.\\n\\nTo reproduce, set `slub_debug=FU init_on_free=1 log_level=7` on the\\ncommand line of a kernel build with `CONFIG_SLAB_FREELIST_HARDENED=y`.\\n\\ndmesg sample log:\\n[   10.708715] =============================================================================\\n[   10.710323] BUG kmalloc-rnd-05-32 (Tainted: G    B           T ): Freepointer corrupt\\n[   10.712695] -----------------------------------------------------------------------------\\n[   10.712695]\\n[   10.712695] Slab 0xffffd8bdc400d580 objects=32 used=4 fp=0xffff9d9a80356f80 flags=0x200000000000a00(workingset|slab|node=0|zone=2)\\n[   10.716698] Object 0xffff9d9a80356600 @offset=1536 fp=0x7ee4f480ce0ecd7c\\n[   10.716698]\\n[   10.716698] Bytes b4 ffff9d9a803565f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n[   10.720703] Object   ffff9d9a80356600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n[   10.720703] Object   ffff9d9a80356610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n[   10.724696] Padding  ffff9d9a8035666c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n[   10.724696] Padding  ffff9d9a8035667c: 00 00 00 00                                      ....\\n[   10.724696] FIX kmalloc-rnd-05-32: Object at 0xffff9d9a80356600 not freed\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/slub: evita poner a cero el puntero libre de objetos externos para un solo commit libre 284f17ac13fe (\\\"mm/slub: maneja la liberación masiva y de objetos individuales por separado\\\") divide la liberación de objetos únicos y masivos en dos funciones slab_free() y slab_free_bulk() lo que lleva a slab_free() a llamar a slab_free_hook() directamente en lugar de slab_free_freelist_hook(). Si se establece `init_on_free`, slab_free_hook() pone a cero el objeto. Luego, si se configuran `slub_debug=F` y `CONFIG_SLAB_FREELIST_HARDENED`, la ruta lenta do_slab_free() ejecuta comprobaciones de coherencia de la lista libre e intenta decodificar un freepointer puesto a cero, lo que conduce a una detección de \\\"Freepointer corrupto\\\" en check_object(). Durante la liberación masiva, slab_free_freelist_hook() no se ve afectado ya que siempre establece el puntero libre de sus objetos usando set_freepointer() para mantener su lista libre reconstruida después de `init_on_free`. Para un solo libre, el puntero libre del objeto debe evitarse cuando se almacena fuera del objeto si está configurado \\\"init_on_free\\\". El puntero libre se deja como está, check_object() puede detectar más adelante un valor de puntero no válido debido a un desbordamiento de objetos. Para reproducir, configure `slub_debug=FU init_on_free=1 log_level=7` en la línea de comando de una compilación del kernel con `CONFIG_SLAB_FREELIST_HARDENED=y`. Registro de muestra de dmesg: [10.708715] ============================================ ================================== [10.710323] ERROR kmalloc-rnd-05-32 (Contaminado: GBT) : Freepointer corrupto [10.712695] -------------------------------------------- --------------------------------- [ 10.712695] [ 10.712695] Losa 0xffffd8bdc400d580 objetos=32 usados=4 fp=0xffff9d9a80356f80 flags=0x200000000000a00(workingset|slab|node=0|zone=2) [ 10.716698] Objeto 0xffff9d9a80356600 @offset=1536 fp=0x7ee4f480ce0ecd7c [ 10.716698] [ 10.716698] Bytes b4 9d9a803565f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.720703] Objeto ffff9d9a80356600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........ [ 10.720703] Objeto ffff9d9a80356610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.724696] Relleno ffff9d9a8035666c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.724696] Relleno ffff9d9a8035667c: 00 00 00 00 .... [ 10.724696 ] FIX kmalloc-rnd-05-32: Objeto en 0xffff9d9a80356600 no liberado\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/56900355485f6e82114b18c812edd57fd7970dcb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8f828aa48812ced28aa39cb3cfe55ef2444d03dd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/56900355485f6e82114b18c812edd57fd7970dcb\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/8f828aa48812ced28aa39cb3cfe55ef2444d03dd\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
      vulnrichment: {
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The freepointer left\\nas is, check_object() may later detect an invalid pointer value due to\\nobjects overflow.\\n\\nTo reproduce, set `slub_debug=FU init_on_free=1 log_level=7` on the\\ncommand line of a kernel build with `CONFIG_SLAB_FREELIST_HARDENED=y`.\\n\\ndmesg sample log:\\n[   10.708715] =============================================================================\\n[   10.710323] BUG kmalloc-rnd-05-32 (Tainted: G    B           T ): Freepointer corrupt\\n[   10.712695] -----------------------------------------------------------------------------\\n[   10.712695]\\n[   10.712695] Slab 0xffffd8bdc400d580 objects=32 used=4 fp=0xffff9d9a80356f80 flags=0x200000000000a00(workingset|slab|node=0|zone=2)\\n[   10.716698] Object 0xffff9d9a80356600 @offset=1536 fp=0x7ee4f480ce0ecd7c\\n[   10.716698]\\n[   10.716698] Bytes b4 ffff9d9a803565f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n[   10.720703] Object   ffff9d9a80356600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n[   10.720703] Object   ffff9d9a80356610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n[   10.724696] Padding  ffff9d9a8035666c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n[   10.724696] Padding  ffff9d9a8035667c: 00 00 00 00                                      ....\\n[   10.724696] FIX kmalloc-rnd-05-32: Object at 0xffff9d9a80356600 not freed\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-05-30T15:28:58.528Z\"}}}",
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}


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