CVE-2024-56544
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: udmabuf: change folios array from kmalloc to kvmalloc When PAGE_SIZE 4096, MAX_PAGE_ORDER 10, 64bit machine, page_alloc only support 4MB. If above this, trigger this warn and return NULL. udmabuf can change size limit, if change it to 3072(3GB), and then alloc 3GB udmabuf, will fail create. [ 4080.876581] ------------[ cut here ]------------ [ 4080.876843] WARNING: CPU: 3 PID: 2015 at mm/page_alloc.c:4556 __alloc_pages+0x2c8/0x350 [ 4080.878839] RIP: 0010:__alloc_pages+0x2c8/0x350 [ 4080.879470] Call Trace: [ 4080.879473] <TASK> [ 4080.879473] ? __alloc_pages+0x2c8/0x350 [ 4080.879475] ? __warn.cold+0x8e/0xe8 [ 4080.880647] ? __alloc_pages+0x2c8/0x350 [ 4080.880909] ? report_bug+0xff/0x140 [ 4080.881175] ? handle_bug+0x3c/0x80 [ 4080.881556] ? exc_invalid_op+0x17/0x70 [ 4080.881559] ? asm_exc_invalid_op+0x1a/0x20 [ 4080.882077] ? udmabuf_create+0x131/0x400 Because MAX_PAGE_ORDER, kmalloc can max alloc 4096 * (1 << 10), 4MB memory, each array entry is pointer(8byte), so can save 524288 pages(2GB). Further more, costly order(order 3) may not be guaranteed that it can be applied for, due to fragmentation. This patch change udmabuf array use kvmalloc_array, this can fallback alloc into vmalloc, which can guarantee allocation for any size and does not affect the performance of kmalloc allocations.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2024-12-27 14:15:34.153000
Last modified
2026-10-21 13:17:51.777000
View original CVE JSON
{
"id": "CVE-2024-56544",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2024-12-27T14:15:34.153",
"lastModified": "2026-10-21T13:17:51.777",
"vulnStatus": "Modified",
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudmabuf: change folios array from kmalloc to kvmalloc\n\nWhen PAGE_SIZE 4096, MAX_PAGE_ORDER 10, 64bit machine,\npage_alloc only support 4MB.\nIf above this, trigger this warn and return NULL.\n\nudmabuf can change size limit, if change it to 3072(3GB), and then alloc\n3GB udmabuf, will fail create.\n\n[ 4080.876581] ------------[ cut here ]------------\n[ 4080.876843] WARNING: CPU: 3 PID: 2015 at mm/page_alloc.c:4556 __alloc_pages+0x2c8/0x350\n[ 4080.878839] RIP: 0010:__alloc_pages+0x2c8/0x350\n[ 4080.879470] Call Trace:\n[ 4080.879473] <TASK>\n[ 4080.879473] ? __alloc_pages+0x2c8/0x350\n[ 4080.879475] ? __warn.cold+0x8e/0xe8\n[ 4080.880647] ? __alloc_pages+0x2c8/0x350\n[ 4080.880909] ? report_bug+0xff/0x140\n[ 4080.881175] ? handle_bug+0x3c/0x80\n[ 4080.881556] ? exc_invalid_op+0x17/0x70\n[ 4080.881559] ? asm_exc_invalid_op+0x1a/0x20\n[ 4080.882077] ? udmabuf_create+0x131/0x400\n\nBecause MAX_PAGE_ORDER, kmalloc can max alloc 4096 * (1 << 10), 4MB\nmemory, each array entry is pointer(8byte), so can save 524288 pages(2GB).\n\nFurther more, costly order(order 3) may not be guaranteed that it can be\napplied for, due to fragmentation.\n\nThis patch change udmabuf array use kvmalloc_array, this can fallback\nalloc into vmalloc, which can guarantee allocation for any size and does\nnot affect the performance of kmalloc allocations."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: udmabuf: cambia la matriz de folios de kmalloc a kvmalloc Cuando PAGE_SIZE es 4096, MAX_PAGE_ORDER es 10, en una máquina de 64 bits, page_alloc solo admite 4 MB. Si es mayor, se activa esta advertencia y se devuelve NULL. udmabuf puede cambiar el límite de tamaño. Si lo cambia a 3072 (3 GB) y luego asigna 3 GB, udmabuf no podrá crearlo. [ 4080.876581] ------------[ cortar aquí ]------------ [ 4080.876843] ADVERTENCIA: CPU: 3 PID: 2015 en mm/page_alloc.c:4556 __alloc_pages+0x2c8/0x350 [ 4080.878839] RIP: 0010:__alloc_pages+0x2c8/0x350 [ 4080.879470] Seguimiento de llamadas: [ 4080.879473] [ 4080.879473] ? __alloc_pages+0x2c8/0x350 [ 4080.879475] ? __warn.cold+0x8e/0xe8 [ 4080.880647] ? __alloc_pages+0x2c8/0x350 [ 4080.880909] ? report_bug+0xff/0x140 [ 4080.881175] ? handle_bug+0x3c/0x80 [ 4080.881556] ? exc_invalid_op+0x17/0x70 [ 4080.881559] ? asm_exc_invalid_op+0x1a/0x20 [ 4080.882077] ? udmabuf_create+0x131/0x400 Debido a MAX_PAGE_ORDER, kmalloc puede asignar un máximo de 4096 * (1 << 10), 4 MB de memoria, cada entrada de la matriz es un puntero (8 bytes), por lo que puede guardar 524288 páginas (2 GB). Además, es posible que no se garantice que se pueda aplicar el pedido costoso (pedido 3) debido a la fragmentación. Este parche cambia la matriz udmabuf para usar kvmalloc_array, lo que permite que la asignación se convierta en una función alternativa de vmalloc, lo que puede garantizar la asignación para cualquier tamaño y no afecta el rendimiento de las asignaciones de kmalloc."
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