cve-2024-44972
Vulnerability from cvelistv5
Published
2024-09-04 18:56
Modified
2024-12-19 09:19
Severity ?
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 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
   containers: {
      adp: [
         {
            metrics: [
               {
                  other: {
                     content: {
                        id: "CVE-2024-44972",
                        options: [
                           {
                              Exploitation: "none",
                           },
                           {
                              Automatable: "no",
                           },
                           {
                              "Technical Impact": "partial",
                           },
                        ],
                        role: "CISA Coordinator",
                        timestamp: "2024-09-10T17:39:07.741693Z",
                        version: "2.0.3",
                     },
                     type: "ssvc",
                  },
               },
            ],
            providerMetadata: {
               dateUpdated: "2024-09-12T17:33:34.428Z",
               orgId: "134c704f-9b21-4f2e-91b3-4a467353bcc0",
               shortName: "CISA-ADP",
            },
            title: "CISA ADP Vulnrichment",
         },
      ],
      cna: {
         affected: [
            {
               defaultStatus: "unaffected",
               product: "Linux",
               programFiles: [
                  "fs/btrfs/extent_io.c",
               ],
               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     lessThan: "ba4dedb71356638d8284e34724daca944be70368",
                     status: "affected",
                     version: "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                     versionType: "git",
                  },
                  {
                     lessThan: "d3b403209f767e5857c1b9fda66726e6e6ffc99f",
                     status: "affected",
                     version: "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                     versionType: "git",
                  },
                  {
                     lessThan: "97713b1a2ced1e4a2a6c40045903797ebd44d7e0",
                     status: "affected",
                     version: "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                     versionType: "git",
                  },
               ],
            },
            {
               defaultStatus: "affected",
               product: "Linux",
               programFiles: [
                  "fs/btrfs/extent_io.c",
               ],
               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     lessThanOrEqual: "6.6.*",
                     status: "unaffected",
                     version: "6.6.46",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.10.*",
                     status: "unaffected",
                     version: "6.10.5",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "*",
                     status: "unaffected",
                     version: "6.11",
                     versionType: "original_commit_for_fix",
                  },
               ],
            },
         ],
         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---",
            },
         ],
         providerMetadata: {
            dateUpdated: "2024-12-19T09:19:23.752Z",
            orgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            shortName: "Linux",
         },
         references: [
            {
               url: "https://git.kernel.org/stable/c/ba4dedb71356638d8284e34724daca944be70368",
            },
            {
               url: "https://git.kernel.org/stable/c/d3b403209f767e5857c1b9fda66726e6e6ffc99f",
            },
            {
               url: "https://git.kernel.org/stable/c/97713b1a2ced1e4a2a6c40045903797ebd44d7e0",
            },
         ],
         title: "btrfs: do not clear page dirty inside extent_write_locked_range()",
         x_generator: {
            engine: "bippy-5f407fcff5a0",
         },
      },
   },
   cveMetadata: {
      assignerOrgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      assignerShortName: "Linux",
      cveId: "CVE-2024-44972",
      datePublished: "2024-09-04T18:56:48.145Z",
      dateReserved: "2024-08-21T05:34:56.669Z",
      dateUpdated: "2024-12-19T09:19:23.752Z",
      state: "PUBLISHED",
   },
   dataType: "CVE_RECORD",
   dataVersion: "5.1",
   "vulnerability-lookup:meta": {
      nvd: "{\"cve\":{\"id\":\"CVE-2024-44972\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-09-04T19:15:31.430\",\"lastModified\":\"2024-10-03T16:10:12.077\",\"vulnStatus\":\"Analyzed\",\"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 ----\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"6.6.46\",\"matchCriteriaId\":\"84C35A98-08C9-4674-8AC8-9CC0757B7699\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.5\",\"matchCriteriaId\":\"D074AE50-4A5E-499C-A2FD-75FD60DEA560\"}]}]}],\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
      vulnrichment: {
         containers: "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-44972\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T17:39:07.741693Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:27.463Z\"}}], \"cna\": {\"title\": \"btrfs: do not clear page dirty inside extent_write_locked_range()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1da177e4c3f4\", \"lessThan\": \"ba4dedb71356\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f4\", \"lessThan\": \"d3b403209f76\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f4\", \"lessThan\": \"97713b1a2ced\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/btrfs/extent_io.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"6.6.46\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.5\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/btrfs/extent_io.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/ba4dedb71356638d8284e34724daca944be70368\"}, {\"url\": \"https://git.kernel.org/stable/c/d3b403209f767e5857c1b9fda66726e6e6ffc99f\"}, {\"url\": \"https://git.kernel.org/stable/c/97713b1a2ced1e4a2a6c40045903797ebd44d7e0\"}], \"x_generator\": {\"engine\": \"bippy-c9c4e1df01b2\"}, \"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---\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-09-15T17:56:13.677Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-44972\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-09-15T17:56:13.677Z\", \"dateReserved\": \"2024-08-21T05:34:56.669Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-09-04T18:56:48.145Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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