fkie_cve-2024-44972
Vulnerability from fkie_nvd
Published
2024-09-04 19:15
Modified
2024-10-03 16:10
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: do not clear page dirty inside extent_write_locked_range() [BUG] For subpage + zoned case, the following workload can lead to rsv data leak at unmount time: # mkfs.btrfs -f -s 4k $dev # mount $dev $mnt # fsstress -w -n 8 -d $mnt -s 1709539240 0/0: fiemap - no filename 0/1: copyrange read - no filename 0/2: write - no filename 0/3: rename - no source filename 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 The dmesg includes the following rsv leak detection warning (all call trace skipped): ------------[ cut here ]------------ WARNING: CPU: 2 PID: 4528 at fs/btrfs/inode.c:8653 btrfs_destroy_inode+0x1e0/0x200 [btrfs] ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ WARNING: CPU: 2 PID: 4528 at fs/btrfs/inode.c:8654 btrfs_destroy_inode+0x1a8/0x200 [btrfs] ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ WARNING: CPU: 2 PID: 4528 at fs/btrfs/inode.c:8660 btrfs_destroy_inode+0x1a0/0x200 [btrfs] ---[ end trace 0000000000000000 ]--- BTRFS info (device sda): last unmount of filesystem 1b4abba9-de34-4f07-9e7f-157cf12a18d6 ------------[ cut here ]------------ WARNING: CPU: 3 PID: 4528 at fs/btrfs/block-group.c:4434 btrfs_free_block_groups+0x338/0x500 [btrfs] ---[ end trace 0000000000000000 ]--- BTRFS info (device sda): space_info DATA has 268218368 free, is not full BTRFS info (device sda): space_info total=268435456, used=204800, pinned=0, reserved=0, may_use=12288, readonly=0 zone_unusable=0 BTRFS info (device sda): global_block_rsv: size 0 reserved 0 BTRFS info (device sda): trans_block_rsv: size 0 reserved 0 BTRFS info (device sda): chunk_block_rsv: size 0 reserved 0 BTRFS info (device sda): delayed_block_rsv: size 0 reserved 0 BTRFS info (device sda): delayed_refs_rsv: size 0 reserved 0 ------------[ cut here ]------------ WARNING: CPU: 3 PID: 4528 at fs/btrfs/block-group.c:4434 btrfs_free_block_groups+0x338/0x500 [btrfs] ---[ end trace 0000000000000000 ]--- BTRFS info (device sda): space_info METADATA has 267796480 free, is not full BTRFS info (device sda): space_info total=268435456, used=131072, pinned=0, reserved=0, may_use=262144, readonly=0 zone_unusable=245760 BTRFS info (device sda): global_block_rsv: size 0 reserved 0 BTRFS info (device sda): trans_block_rsv: size 0 reserved 0 BTRFS info (device sda): chunk_block_rsv: size 0 reserved 0 BTRFS info (device sda): delayed_block_rsv: size 0 reserved 0 BTRFS info (device sda): delayed_refs_rsv: size 0 reserved 0 Above $dev is a tcmu-runner emulated zoned HDD, which has a max zone append size of 64K, and the system has 64K page size. [CAUSE] I have added several trace_printk() to show the events (header skipped): > 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 The above lines show our buffered write has dirtied 3 pages of inode 259 of root 5: 704K 768K 832K 896K I |////I/////////////////I///////////| I 756K 868K |///| is the dirtied range using subpage bitmaps. and 'I' is the page boundary. Meanwhile all three pages (704K, 768K, 832K) have their PageDirty flag set. > btrfs_direct_write: r/i=5/259 start dio filepos=696320 len=102400 Then direct IO writ ---truncated---
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/97713b1a2ced1e4a2a6c40045903797ebd44d7e0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ba4dedb71356638d8284e34724daca944be70368Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d3b403209f767e5857c1b9fda66726e6e6ffc99fPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *


To clipboard 

{
   configurations: [
      {
         nodes: [
            {
               cpeMatch: [
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "84C35A98-08C9-4674-8AC8-9CC0757B7699",
                     versionEndExcluding: "6.6.46",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "D074AE50-4A5E-499C-A2FD-75FD60DEA560",
                     versionEndExcluding: "6.10.5",
                     versionStartIncluding: "6.7",
                     vulnerable: true,
                  },
               ],
               negate: false,
               operator: "OR",
            },
         ],
      },
   ],
   cveTags: [],
   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 página sucia dentro de extended_write_locked_range() [ERROR] Para el caso de subpágina + zonificación, 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 detección de fugas de rsv (se omite todo el seguimiento de llamadas): ------------[ cortar aquí ]------------ ADVERTENCIA: CPU: 2 PID: 4528 en fs/btrfs/inode.c:8653 btrfs_destroy_inode+0x1e0/0x200 [btrfs] ---[ fin del seguimiento 000000000000000 ]--- ------------[ cortar aquí ]------------ ADVERTENCIA: CPU: 2 PID: 4528 en fs/btrfs/inode.c:8654 btrfs_destroy_inode+0x1a8/0x200 [btrfs] ---[ fin del seguimiento 000000000000000 ]--- ------------[ cortar aquí ]------------ ADVERTENCIA: CPU: 2 PID: 4528 en fs/btrfs/inode.c:8660 btrfs_destroy_inode+0x1a0/0x200 [btrfs] ---[ fin del seguimiento 000000000000000 ]--- Información de BTRFS (dispositivo sda): último desmontaje del sistema de archivos 1b4abba9-de34-4f07-9e7f-157cf12a18d6 ------------[ cortar aquí ]------------ ADVERTENCIA: CPU: 3 PID: 4528 en fs/btrfs/block-group.c:4434 btrfs_free_block_groups+0x338/0x500 [btrfs] ---[ fin del seguimiento 000000000000000 ]--- Información de BTRFS (dispositivo sda): space_info DATA tiene 268218368 libres, no está lleno Información de BTRFS (dispositivo sda): space_info total=268435456, used=204800, pinned=0, reserved=0, may_use=12288, readonly=0 zone_unusable=0 BTRFS información (dispositivo sda): global_block_rsv: tamaño 0 reservado 0 información BTRFS (dispositivo sda): trans_block_rsv: tamaño 0 reservado 0 información BTRFS (dispositivo sda): chunk_block_rsv: tamaño 0 reservado 0 información BTRFS (dispositivo sda): delayed_block_rsv: tamaño 0 reservado 0 información BTRFS (dispositivo sda): delayed_refs_rsv: tamaño 0 reservado 0 ------------[ cortar aquí ]------------ ADVERTENCIA: CPU: 3 PID: 4528 en fs/btrfs/block-group.c:4434 btrfs_free_block_groups+0x338/0x500 [btrfs] ---[ fin de seguimiento 000000000000000 ]--- información BTRFS (dispositivo sda): space_info METADATA tiene 267796480 libres, es Información BTRFS no completa (dispositivo sda): space_info total=268435456, used=131072, pinned=0, reserved=0, may_use=262144, readonly=0 zone_unusable=245760 Información BTRFS (dispositivo sda): global_block_rsv: tamaño 0 reservado 0 Información BTRFS (dispositivo sda): trans_block_rsv: tamaño 0 reservado 0 Información BTRFS (dispositivo sda): chunk_block_rsv: tamaño 0 reservado 0 Información BTRFS (dispositivo sda): delayed_block_rsv: tamaño 0 reservado 0 Información BTRFS (dispositivo sda): delayed_refs_rsv: tamaño 0 reservado 0 Arriba $dev es un HDD zonificado emulado tcmu-runner, que tiene un tamaño máximo de anexión de zona de 64K, y el sistema tiene un tamaño de página de 64K. [CAUSA] He añadido 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 líneas anteriores muestran que nuestra escritura en búfer ha ensuciado 3 páginas de inodo 259 de la raíz 5: 704K 768K 832K 896K --- truncado ----",
      },
   ],
   id: "CVE-2024-44972",
   lastModified: "2024-10-03T16:10:12.077",
   metrics: {
      cvssMetricV31: [
         {
            cvssData: {
               attackComplexity: "LOW",
               attackVector: "LOCAL",
               availabilityImpact: "HIGH",
               baseScore: 5.5,
               baseSeverity: "MEDIUM",
               confidentialityImpact: "NONE",
               integrityImpact: "NONE",
               privilegesRequired: "LOW",
               scope: "UNCHANGED",
               userInteraction: "NONE",
               vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
               version: "3.1",
            },
            exploitabilityScore: 1.8,
            impactScore: 3.6,
            source: "nvd@nist.gov",
            type: "Primary",
         },
      ],
   },
   published: "2024-09-04T19:15:31.430",
   references: [
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/97713b1a2ced1e4a2a6c40045903797ebd44d7e0",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/ba4dedb71356638d8284e34724daca944be70368",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/d3b403209f767e5857c1b9fda66726e6e6ffc99f",
      },
   ],
   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Analyzed",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "NVD-CWE-noinfo",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
   ],
}


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