CVE-2024-44972

{"id": "CVE-2024-44972", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-09-04T19:15:31.430", "references": [{"url": "https://git.kernel.org/stable/c/97713b1a2ced1e4a2a6c40045903797ebd44d7e0", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ba4dedb71356638d8284e34724daca944be70368", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d3b403209f767e5857c1b9fda66726e6e6ffc99f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: do not clear page dirty inside extent_write_locked_range()\n\n[BUG]\nFor subpage + zoned case, the following workload can lead to rsv data\nleak at unmount time:\n\n # mkfs.btrfs -f -s 4k $dev\n # mount $dev $mnt\n # fsstress -w -n 8 -d $mnt -s 1709539240\n 0/0: fiemap - no filename\n 0/1: copyrange read - no filename\n 0/2: write - no filename\n 0/3: rename - no source filename\n 0/4: creat f0 x:0 0 0\n 0/4: creat add id=0,parent=-1\n 0/5: writev f0[259 1 0 0 0 0] [778052,113,965] 0\n 0/6: ioctl(FIEMAP) f0[259 1 0 0 224 887097] [1294220,2291618343991484791,0x10000] -1\n 0/7: dwrite - xfsctl(XFS_IOC_DIOINFO) f0[259 1 0 0 224 887097] return 25, fallback to stat()\n 0/7: dwrite f0[259 1 0 0 224 887097] [696320,102400] 0\n # umount $mnt\n\nThe dmesg includes the following rsv leak detection warning (all call\ntrace skipped):\n\n ------------[ cut here ]------------\n WARNING: CPU: 2 PID: 4528 at fs/btrfs/inode.c:8653 btrfs_destroy_inode+0x1e0/0x200 [btrfs]\n ---[ end trace 0000000000000000 ]---\n ------------[ cut here ]------------\n WARNING: CPU: 2 PID: 4528 at fs/btrfs/inode.c:8654 btrfs_destroy_inode+0x1a8/0x200 [btrfs]\n ---[ end trace 0000000000000000 ]---\n ------------[ cut here ]------------\n WARNING: CPU: 2 PID: 4528 at fs/btrfs/inode.c:8660 btrfs_destroy_inode+0x1a0/0x200 [btrfs]\n ---[ end trace 0000000000000000 ]---\n BTRFS info (device sda): last unmount of filesystem 1b4abba9-de34-4f07-9e7f-157cf12a18d6\n ------------[ cut here ]------------\n WARNING: CPU: 3 PID: 4528 at fs/btrfs/block-group.c:4434 btrfs_free_block_groups+0x338/0x500 [btrfs]\n ---[ end trace 0000000000000000 ]---\n BTRFS info (device sda): space_info DATA has 268218368 free, is not full\n BTRFS info (device sda): space_info total=268435456, used=204800, pinned=0, reserved=0, may_use=12288, readonly=0 zone_unusable=0\n BTRFS info (device sda): global_block_rsv: size 0 reserved 0\n BTRFS info (device sda): trans_block_rsv: size 0 reserved 0\n BTRFS info (device sda): chunk_block_rsv: size 0 reserved 0\n BTRFS info (device sda): delayed_block_rsv: size 0 reserved 0\n BTRFS info (device sda): delayed_refs_rsv: size 0 reserved 0\n ------------[ cut here ]------------\n WARNING: CPU: 3 PID: 4528 at fs/btrfs/block-group.c:4434 btrfs_free_block_groups+0x338/0x500 [btrfs]\n ---[ end trace 0000000000000000 ]---\n BTRFS info (device sda): space_info METADATA has 267796480 free, is not full\n BTRFS info (device sda): space_info total=268435456, used=131072, pinned=0, reserved=0, may_use=262144, readonly=0 zone_unusable=245760\n BTRFS info (device sda): global_block_rsv: size 0 reserved 0\n BTRFS info (device sda): trans_block_rsv: size 0 reserved 0\n BTRFS info (device sda): chunk_block_rsv: size 0 reserved 0\n BTRFS info (device sda): delayed_block_rsv: size 0 reserved 0\n BTRFS info (device sda): delayed_refs_rsv: size 0 reserved 0\n\nAbove $dev is a tcmu-runner emulated zoned HDD, which has a max zone\nappend size of 64K, and the system has 64K page size.\n\n[CAUSE]\nI have added several trace_printk() to show the events (header skipped):\n\n > btrfs_dirty_pages: r/i=5/259 dirty start=774144 len=114688\n > btrfs_dirty_pages: r/i=5/259 dirty part of page=720896 off_in_page=53248 len_in_page=12288\n > btrfs_dirty_pages: r/i=5/259 dirty part of page=786432 off_in_page=0 len_in_page=65536\n > btrfs_dirty_pages: r/i=5/259 dirty part of page=851968 off_in_page=0 len_in_page=36864\n\nThe above lines show our buffered write has dirtied 3 pages of inode\n259 of root 5:\n\n 704K 768K 832K 896K\n I |////I/////////////////I///////////| I\n 756K 868K\n\n |///| is the dirtied range using subpage bitmaps. and 'I' is the page\n boundary.\n\n Meanwhile all three pages (704K, 768K, 832K) have their PageDirty\n flag set.\n\n > btrfs_direct_write: r/i=5/259 start dio filepos=696320 len=102400\n\nThen direct IO writ\n---truncated---"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: no borrar la p\u00e1gina sucia dentro de extended_write_locked_range() [ERROR] Para el caso de subp\u00e1gina + zonificaci\u00f3n, la siguiente carga de trabajo puede provocar una fuga de datos de rsv en el momento del desmontaje: # mkfs.btrfs -f -s 4k $dev # mount $dev $mnt # fsstress -w -n 8 -d $mnt -s 1709539240 0/0: fiemap - sin nombre de archivo 0/1: copyrange read - sin nombre de archivo 0/2: write - sin nombre de archivo 0/3: rename - sin nombre de archivo de origen 0/4: creat f0 x:0 0 0 0/4: creat add id=0,parent=-1 0/5: writev f0[259 1 0 0 0 0] [778052,113,965] 0 0/6: ioctl(FIEMAP) f0[259 1 0 0 224 887097] [1294220,2291618343991484791,0x10000] -1 0/7: dwrite - xfsctl(XFS_IOC_DIOINFO) f0[259 1 0 0 224 887097] return 25, fallback to stat() 0/7: dwrite f0[259 1 0 0 224 887097] [696320,102400] 0 # umount $mnt El dmesg incluye la siguiente advertencia de detecci\u00f3n de fugas de rsv (se omite todo el seguimiento de llamadas): ------------[ cortar aqu\u00ed ]------------ ADVERTENCIA: CPU: 2 PID: 4528 en fs/btrfs/inode.c:8653 btrfs_destroy_inode+0x1e0/0x200 [btrfs] ---[ fin del seguimiento 000000000000000 ]--- ------------[ cortar aqu\u00ed ]------------ ADVERTENCIA: CPU: 2 PID: 4528 en fs/btrfs/inode.c:8654 btrfs_destroy_inode+0x1a8/0x200 [btrfs] ---[ fin del seguimiento 000000000000000 ]--- ------------[ cortar aqu\u00ed ]------------ ADVERTENCIA: CPU: 2 PID: 4528 en fs/btrfs/inode.c:8660 btrfs_destroy_inode+0x1a0/0x200 [btrfs] ---[ fin del seguimiento 000000000000000 ]--- Informaci\u00f3n de BTRFS (dispositivo sda): \u00faltimo desmontaje del sistema de archivos 1b4abba9-de34-4f07-9e7f-157cf12a18d6 ------------[ cortar aqu\u00ed ]------------ ADVERTENCIA: CPU: 3 PID: 4528 en fs/btrfs/block-group.c:4434 btrfs_free_block_groups+0x338/0x500 [btrfs] ---[ fin del seguimiento 000000000000000 ]--- Informaci\u00f3n de BTRFS (dispositivo sda): space_info DATA tiene 268218368 libres, no est\u00e1 lleno Informaci\u00f3n de BTRFS (dispositivo sda): space_info total=268435456, used=204800, pinned=0, reserved=0, may_use=12288, readonly=0 zone_unusable=0 BTRFS informaci\u00f3n (dispositivo sda): global_block_rsv: tama\u00f1o 0 reservado 0 informaci\u00f3n BTRFS (dispositivo sda): trans_block_rsv: tama\u00f1o 0 reservado 0 informaci\u00f3n BTRFS (dispositivo sda): chunk_block_rsv: tama\u00f1o 0 reservado 0 informaci\u00f3n BTRFS (dispositivo sda): delayed_block_rsv: tama\u00f1o 0 reservado 0 informaci\u00f3n BTRFS (dispositivo sda): delayed_refs_rsv: tama\u00f1o 0 reservado 0 ------------[ cortar aqu\u00ed ]------------ ADVERTENCIA: CPU: 3 PID: 4528 en fs/btrfs/block-group.c:4434 btrfs_free_block_groups+0x338/0x500 [btrfs] ---[ fin de seguimiento 000000000000000 ]--- informaci\u00f3n BTRFS (dispositivo sda): space_info METADATA tiene 267796480 libres, es Informaci\u00f3n BTRFS no completa (dispositivo sda): space_info total=268435456, used=131072, pinned=0, reserved=0, may_use=262144, readonly=0 zone_unusable=245760 Informaci\u00f3n BTRFS (dispositivo sda): global_block_rsv: tama\u00f1o 0 reservado 0 Informaci\u00f3n BTRFS (dispositivo sda): trans_block_rsv: tama\u00f1o 0 reservado 0 Informaci\u00f3n BTRFS (dispositivo sda): chunk_block_rsv: tama\u00f1o 0 reservado 0 Informaci\u00f3n BTRFS (dispositivo sda): delayed_block_rsv: tama\u00f1o 0 reservado 0 Informaci\u00f3n BTRFS (dispositivo sda): delayed_refs_rsv: tama\u00f1o 0 reservado 0 Arriba $dev es un HDD zonificado emulado tcmu-runner, que tiene un tama\u00f1o m\u00e1ximo de anexi\u00f3n de zona de 64K, y el sistema tiene un tama\u00f1o de p\u00e1gina de 64K. [CAUSA] He a\u00f1adido varios trace_printk() para mostrar los eventos (encabezado omitido): > btrfs_dirty_pages: r/i=5/259 dirty start=774144 len=114688 > btrfs_dirty_pages: r/i=5/259 dirty part of page=720896 off_in_page=53248 len_in_page=12288 > btrfs_dirty_pages: r/i=5/259 dirty part of page=786432 off_in_page=0 len_in_page=65536 > btrfs_dirty_pages: r/i=5/259 dirty part of page=851968 off_in_page=0 len_in_page=36864 Las l\u00edneas anteriores muestran que nuestra escritura en b\u00fafer ha ensuciado 3 p\u00e1ginas de inodo 259 de la ra\u00edz 5: 704K 768K 832K 896K --- truncado ----"}], "lastModified": "2024-10-03T16:10:12.077", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "84C35A98-08C9-4674-8AC8-9CC0757B7699", "versionEndExcluding": "6.6.46"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D074AE50-4A5E-499C-A2FD-75FD60DEA560", "versionEndExcluding": "6.10.5", "versionStartIncluding": "6.7"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}