CVE-2023-52622
Vulnerability from cvelistv5
Published
2024-03-26 17:19
Modified
2024-08-02 23:03
Severity
Summary
ext4: avoid online resizing failures due to oversized flex bg
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5d1935ac02ca5aee364a449a35e2977ea84509b0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6d2cbf517dcabc093159cf138ad5712c9c7fa954
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8b1413dbfe49646eda2c00c0f1144ee9d3368e0c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b183fe8702e78bba3dcef8e7193cab6898abee07
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cd1f93ca97a9136989f3bd2bf90696732a2ed644
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cfbbb3199e71b63fc26cee0ebff327c47128a1e8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc3e0f55bec4410f3d74352c4a7c79f518088ee2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website

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Currently, the minimum value of\\nMAX_ORDER is 8, the minimum value of PAGE_SIZE is 4096, the corresponding\\nmaximum number of groups that can be allocated is:\\n\\n (PAGE_SIZE \u003c\u003c MAX_ORDER) / sizeof(struct ext4_new_group_data) \u2248 21845\\n\\nAnd the value that is down-aligned to the power of 2 is 16384. Therefore,\\nthis value is defined as MAX_RESIZE_BG, and the number of groups added\\neach time does not exceed this value during resizing, and is added multiple\\ntimes to complete the online resizing. The difference is that the metadata\\nin a flex_bg may be more dispersed.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: evita fallos de cambio de tama\u00f1o en l\u00ednea debido a flex bg sobredimensionado Cuando redimensionamos en l\u00ednea un sistema de archivos ext4 con un flexbg_size sobredimensionado, mkfs.ext4 -F -G 67108864 $dev -b 4096 100M mount $dev $dir resize2fs $dev 16G se activa el siguiente WARN_ON: ===================================== ============================== ADVERTENCIA: CPU: 0 PID: 427 en mm/page_alloc.c:4402 __alloc_pages+0x411/ 0x550 M\u00f3dulos vinculados en: sg(E) CPU: 0 PID: 427 Comm: resize2fs Contaminado: GE 6.6.0-rc5+ #314 RIP: 0010:__alloc_pages+0x411/0x550 Seguimiento de llamadas:  __kmalloc_large_node+0xa2/0x200 __kmalloc+ 0x16e/0x290 text4_resize_fs+0x481/0xd80 __ext4_ioctl+0x1616/0x1d90 text4_ioctl+0x12/0x20 __x64_sys_ioctl+0xf0/0x150 do_syscall_64+0x3b/0x90 ======== =============== ============================================ Esto se debe a que flexbg_size tambi\u00e9n lo es grande y el tama\u00f1o de la matriz new_group_data que se asignar\u00e1 excede MAX_ORDER. Actualmente, el valor m\u00ednimo de MAX_ORDER es 8, el valor m\u00ednimo de PAGE_SIZE es 4096, el n\u00famero m\u00e1ximo correspondiente de grupos que se pueden asignar es: (PAGE_SIZE \u0026lt;\u0026lt; MAX_ORDER) / sizeof(struct text4_new_group_data) ? 21845 Y el valor que est\u00e1 hacia abajo -alineado a la potencia de 2 es 16384. Por lo tanto, este valor se define como MAX_RESIZE_BG, y el n\u00famero de grupos agregados cada vez no excede este valor durante el cambio de tama\u00f1o y se agrega varias veces para completar el cambio de tama\u00f1o en l\u00ednea. 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