CVE-2023-53323 (GCVE-0-2023-53323)
Vulnerability from cvelistv5
Published
2025-09-16 16:11
Modified
2025-09-16 16:11
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ext2/dax: Fix ext2_setsize when len is page aligned PAGE_ALIGN(x) macro gives the next highest value which is multiple of pagesize. But if x is already page aligned then it simply returns x. So, if x passed is 0 in dax_zero_range() function, that means the length gets passed as 0 to ->iomap_begin(). In ext2 it then calls ext2_get_blocks -> max_blocks as 0 and hits bug_on here in ext2_get_blocks(). BUG_ON(maxblocks == 0); Instead we should be calling dax_truncate_page() here which takes care of it. i.e. it only calls dax_zero_range if the offset is not page/block aligned. This can be easily triggered with following on fsdax mounted pmem device. dd if=/dev/zero of=file count=1 bs=512 truncate -s 0 file [79.525838] EXT2-fs (pmem0): DAX enabled. Warning: EXPERIMENTAL, use at your own risk [79.529376] ext2 filesystem being mounted at /mnt1/test supports timestamps until 2038 (0x7fffffff) [93.793207] ------------[ cut here ]------------ [93.795102] kernel BUG at fs/ext2/inode.c:637! [93.796904] invalid opcode: 0000 [#1] PREEMPT SMP PTI [93.798659] CPU: 0 PID: 1192 Comm: truncate Not tainted 6.3.0-rc2-xfstests-00056-g131086faa369 #139 [93.806459] RIP: 0010:ext2_get_blocks.constprop.0+0x524/0x610 <...> [93.835298] Call Trace: [93.836253] <TASK> [93.837103] ? lock_acquire+0xf8/0x110 [93.838479] ? d_lookup+0x69/0xd0 [93.839779] ext2_iomap_begin+0xa7/0x1c0 [93.841154] iomap_iter+0xc7/0x150 [93.842425] dax_zero_range+0x6e/0xa0 [93.843813] ext2_setsize+0x176/0x1b0 [93.845164] ext2_setattr+0x151/0x200 [93.846467] notify_change+0x341/0x4e0 [93.847805] ? lock_acquire+0xf8/0x110 [93.849143] ? do_truncate+0x74/0xe0 [93.850452] ? do_truncate+0x84/0xe0 [93.851739] do_truncate+0x84/0xe0 [93.852974] do_sys_ftruncate+0x2b4/0x2f0 [93.854404] do_syscall_64+0x3f/0x90 [93.855789] entry_SYSCALL_64_after_hwframe+0x72/0xdc
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5cee8bfb8cbd99c97aff85d2bf066b6a496e13ab
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9e54fd14bd143c261e52fde74355e85e9526c58c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fcced95b6ba2a507a83b8b3e0358a8ac16b13e35
Impacted products
Vendor Product Version
Linux Linux Version: 2aa3048e03d38d5358be2553d4b638c1a018498c
Version: 2aa3048e03d38d5358be2553d4b638c1a018498c
Version: 2aa3048e03d38d5358be2553d4b638c1a018498c
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   Linux Linux Version: 5.15
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext2/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9e54fd14bd143c261e52fde74355e85e9526c58c",
              "status": "affected",
              "version": "2aa3048e03d38d5358be2553d4b638c1a018498c",
              "versionType": "git"
            },
            {
              "lessThan": "5cee8bfb8cbd99c97aff85d2bf066b6a496e13ab",
              "status": "affected",
              "version": "2aa3048e03d38d5358be2553d4b638c1a018498c",
              "versionType": "git"
            },
            {
              "lessThan": "fcced95b6ba2a507a83b8b3e0358a8ac16b13e35",
              "status": "affected",
              "version": "2aa3048e03d38d5358be2553d4b638c1a018498c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ext2/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.4.*",
              "status": "unaffected",
              "version": "6.4.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.40",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4.5",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.5",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next2/dax: Fix ext2_setsize when len is page aligned\n\nPAGE_ALIGN(x) macro gives the next highest value which is multiple of\npagesize. But if x is already page aligned then it simply returns x.\nSo, if x passed is 0 in dax_zero_range() function, that means the\nlength gets passed as 0 to -\u003eiomap_begin().\n\nIn ext2 it then calls ext2_get_blocks -\u003e max_blocks as 0 and hits bug_on\nhere in ext2_get_blocks().\n\tBUG_ON(maxblocks == 0);\n\nInstead we should be calling dax_truncate_page() here which takes\ncare of it. i.e. it only calls dax_zero_range if the offset is not\npage/block aligned.\n\nThis can be easily triggered with following on fsdax mounted pmem\ndevice.\n\ndd if=/dev/zero of=file count=1 bs=512\ntruncate -s 0 file\n\n[79.525838] EXT2-fs (pmem0): DAX enabled. Warning: EXPERIMENTAL, use at your own risk\n[79.529376] ext2 filesystem being mounted at /mnt1/test supports timestamps until 2038 (0x7fffffff)\n[93.793207] ------------[ cut here ]------------\n[93.795102] kernel BUG at fs/ext2/inode.c:637!\n[93.796904] invalid opcode: 0000 [#1] PREEMPT SMP PTI\n[93.798659] CPU: 0 PID: 1192 Comm: truncate Not tainted 6.3.0-rc2-xfstests-00056-g131086faa369 #139\n[93.806459] RIP: 0010:ext2_get_blocks.constprop.0+0x524/0x610\n\u003c...\u003e\n[93.835298] Call Trace:\n[93.836253]  \u003cTASK\u003e\n[93.837103]  ? lock_acquire+0xf8/0x110\n[93.838479]  ? d_lookup+0x69/0xd0\n[93.839779]  ext2_iomap_begin+0xa7/0x1c0\n[93.841154]  iomap_iter+0xc7/0x150\n[93.842425]  dax_zero_range+0x6e/0xa0\n[93.843813]  ext2_setsize+0x176/0x1b0\n[93.845164]  ext2_setattr+0x151/0x200\n[93.846467]  notify_change+0x341/0x4e0\n[93.847805]  ? lock_acquire+0xf8/0x110\n[93.849143]  ? do_truncate+0x74/0xe0\n[93.850452]  ? do_truncate+0x84/0xe0\n[93.851739]  do_truncate+0x84/0xe0\n[93.852974]  do_sys_ftruncate+0x2b4/0x2f0\n[93.854404]  do_syscall_64+0x3f/0x90\n[93.855789]  entry_SYSCALL_64_after_hwframe+0x72/0xdc"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-16T16:11:58.877Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9e54fd14bd143c261e52fde74355e85e9526c58c"
        },
        {
          "url": "https://git.kernel.org/stable/c/5cee8bfb8cbd99c97aff85d2bf066b6a496e13ab"
        },
        {
          "url": "https://git.kernel.org/stable/c/fcced95b6ba2a507a83b8b3e0358a8ac16b13e35"
        }
      ],
      "title": "ext2/dax: Fix ext2_setsize when len is page aligned",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53323",
    "datePublished": "2025-09-16T16:11:58.877Z",
    "dateReserved": "2025-09-16T16:08:59.563Z",
    "dateUpdated": "2025-09-16T16:11:58.877Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53323\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-16T17:15:38.410\",\"lastModified\":\"2025-09-17T14:18:55.093\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next2/dax: Fix ext2_setsize when len is page aligned\\n\\nPAGE_ALIGN(x) macro gives the next highest value which is multiple of\\npagesize. But if x is already page aligned then it simply returns x.\\nSo, if x passed is 0 in dax_zero_range() function, that means the\\nlength gets passed as 0 to -\u003eiomap_begin().\\n\\nIn ext2 it then calls ext2_get_blocks -\u003e max_blocks as 0 and hits bug_on\\nhere in ext2_get_blocks().\\n\\tBUG_ON(maxblocks == 0);\\n\\nInstead we should be calling dax_truncate_page() here which takes\\ncare of it. i.e. it only calls dax_zero_range if the offset is not\\npage/block aligned.\\n\\nThis can be easily triggered with following on fsdax mounted pmem\\ndevice.\\n\\ndd if=/dev/zero of=file count=1 bs=512\\ntruncate -s 0 file\\n\\n[79.525838] EXT2-fs (pmem0): DAX enabled. Warning: EXPERIMENTAL, use at your own risk\\n[79.529376] ext2 filesystem being mounted at /mnt1/test supports timestamps until 2038 (0x7fffffff)\\n[93.793207] ------------[ cut here ]------------\\n[93.795102] kernel BUG at fs/ext2/inode.c:637!\\n[93.796904] invalid opcode: 0000 [#1] PREEMPT SMP PTI\\n[93.798659] CPU: 0 PID: 1192 Comm: truncate Not tainted 6.3.0-rc2-xfstests-00056-g131086faa369 #139\\n[93.806459] RIP: 0010:ext2_get_blocks.constprop.0+0x524/0x610\\n\u003c...\u003e\\n[93.835298] Call Trace:\\n[93.836253]  \u003cTASK\u003e\\n[93.837103]  ? lock_acquire+0xf8/0x110\\n[93.838479]  ? d_lookup+0x69/0xd0\\n[93.839779]  ext2_iomap_begin+0xa7/0x1c0\\n[93.841154]  iomap_iter+0xc7/0x150\\n[93.842425]  dax_zero_range+0x6e/0xa0\\n[93.843813]  ext2_setsize+0x176/0x1b0\\n[93.845164]  ext2_setattr+0x151/0x200\\n[93.846467]  notify_change+0x341/0x4e0\\n[93.847805]  ? lock_acquire+0xf8/0x110\\n[93.849143]  ? do_truncate+0x74/0xe0\\n[93.850452]  ? do_truncate+0x84/0xe0\\n[93.851739]  do_truncate+0x84/0xe0\\n[93.852974]  do_sys_ftruncate+0x2b4/0x2f0\\n[93.854404]  do_syscall_64+0x3f/0x90\\n[93.855789]  entry_SYSCALL_64_after_hwframe+0x72/0xdc\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5cee8bfb8cbd99c97aff85d2bf066b6a496e13ab\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9e54fd14bd143c261e52fde74355e85e9526c58c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fcced95b6ba2a507a83b8b3e0358a8ac16b13e35\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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