CVE-2023-53447 (GCVE-0-2023-53447)
Vulnerability from cvelistv5
Published
2025-09-18 16:04
Modified
2025-09-19 15:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: don't reset unchangable mount option in f2fs_remount() syzbot reports a bug as below: general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN RIP: 0010:__lock_acquire+0x69/0x2000 kernel/locking/lockdep.c:4942 Call Trace: lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5691 __raw_write_lock include/linux/rwlock_api_smp.h:209 [inline] _raw_write_lock+0x2e/0x40 kernel/locking/spinlock.c:300 __drop_extent_tree+0x3ac/0x660 fs/f2fs/extent_cache.c:1100 f2fs_drop_extent_tree+0x17/0x30 fs/f2fs/extent_cache.c:1116 f2fs_insert_range+0x2d5/0x3c0 fs/f2fs/file.c:1664 f2fs_fallocate+0x4e4/0x6d0 fs/f2fs/file.c:1838 vfs_fallocate+0x54b/0x6b0 fs/open.c:324 ksys_fallocate fs/open.c:347 [inline] __do_sys_fallocate fs/open.c:355 [inline] __se_sys_fallocate fs/open.c:353 [inline] __x64_sys_fallocate+0xbd/0x100 fs/open.c:353 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The root cause is race condition as below: - since it tries to remount rw filesystem, so that do_remount won't call sb_prepare_remount_readonly to block fallocate, there may be race condition in between remount and fallocate. - in f2fs_remount(), default_options() will reset mount option to default one, and then update it based on result of parse_options(), so there is a hole which race condition can happen. Thread A Thread B - f2fs_fill_super - parse_options - clear_opt(READ_EXTENT_CACHE) - f2fs_remount - default_options - set_opt(READ_EXTENT_CACHE) - f2fs_fallocate - f2fs_insert_range - f2fs_drop_extent_tree - __drop_extent_tree - __may_extent_tree - test_opt(READ_EXTENT_CACHE) return true - write_lock(&et->lock) access NULL pointer - parse_options - clear_opt(READ_EXTENT_CACHE)
References
Impacted products
Vendor Product Version
Linux Linux Version: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4
Version: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "115557cc226a927924f2d7d1980ccbf6e3b3bb36",
              "status": "affected",
              "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
              "versionType": "git"
            },
            {
              "lessThan": "458c15dfbce62c35fefd9ca637b20a051309c9f1",
              "status": "affected",
              "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.8"
            },
            {
              "lessThan": "3.8",
              "status": "unaffected",
              "version": "0",
              "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": "6.4.5",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.5",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: don\u0027t reset unchangable mount option in f2fs_remount()\n\nsyzbot reports a bug as below:\n\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN\nRIP: 0010:__lock_acquire+0x69/0x2000 kernel/locking/lockdep.c:4942\nCall Trace:\n lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5691\n __raw_write_lock include/linux/rwlock_api_smp.h:209 [inline]\n _raw_write_lock+0x2e/0x40 kernel/locking/spinlock.c:300\n __drop_extent_tree+0x3ac/0x660 fs/f2fs/extent_cache.c:1100\n f2fs_drop_extent_tree+0x17/0x30 fs/f2fs/extent_cache.c:1116\n f2fs_insert_range+0x2d5/0x3c0 fs/f2fs/file.c:1664\n f2fs_fallocate+0x4e4/0x6d0 fs/f2fs/file.c:1838\n vfs_fallocate+0x54b/0x6b0 fs/open.c:324\n ksys_fallocate fs/open.c:347 [inline]\n __do_sys_fallocate fs/open.c:355 [inline]\n __se_sys_fallocate fs/open.c:353 [inline]\n __x64_sys_fallocate+0xbd/0x100 fs/open.c:353\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe root cause is race condition as below:\n- since it tries to remount rw filesystem, so that do_remount won\u0027t\ncall sb_prepare_remount_readonly to block fallocate, there may be race\ncondition in between remount and fallocate.\n- in f2fs_remount(), default_options() will reset mount option to default\none, and then update it based on result of parse_options(), so there is\na hole which race condition can happen.\n\nThread A\t\t\tThread B\n- f2fs_fill_super\n - parse_options\n  - clear_opt(READ_EXTENT_CACHE)\n\n- f2fs_remount\n - default_options\n  - set_opt(READ_EXTENT_CACHE)\n\t\t\t\t- f2fs_fallocate\n\t\t\t\t - f2fs_insert_range\n\t\t\t\t  - f2fs_drop_extent_tree\n\t\t\t\t   - __drop_extent_tree\n\t\t\t\t    - __may_extent_tree\n\t\t\t\t     - test_opt(READ_EXTENT_CACHE) return true\n\t\t\t\t    - write_lock(\u0026et-\u003elock) access NULL pointer\n - parse_options\n  - clear_opt(READ_EXTENT_CACHE)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-19T15:21:41.293Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/115557cc226a927924f2d7d1980ccbf6e3b3bb36"
        },
        {
          "url": "https://git.kernel.org/stable/c/458c15dfbce62c35fefd9ca637b20a051309c9f1"
        }
      ],
      "title": "f2fs: don\u0027t reset unchangable mount option in f2fs_remount()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53447",
    "datePublished": "2025-09-18T16:04:22.649Z",
    "dateReserved": "2025-09-17T14:54:09.753Z",
    "dateUpdated": "2025-09-19T15:21:41.293Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53447\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-18T16:15:49.067\",\"lastModified\":\"2025-09-19T16:00:27.847\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nf2fs: don\u0027t reset unchangable mount option in f2fs_remount()\\n\\nsyzbot reports a bug as below:\\n\\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN\\nRIP: 0010:__lock_acquire+0x69/0x2000 kernel/locking/lockdep.c:4942\\nCall Trace:\\n lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5691\\n __raw_write_lock include/linux/rwlock_api_smp.h:209 [inline]\\n _raw_write_lock+0x2e/0x40 kernel/locking/spinlock.c:300\\n __drop_extent_tree+0x3ac/0x660 fs/f2fs/extent_cache.c:1100\\n f2fs_drop_extent_tree+0x17/0x30 fs/f2fs/extent_cache.c:1116\\n f2fs_insert_range+0x2d5/0x3c0 fs/f2fs/file.c:1664\\n f2fs_fallocate+0x4e4/0x6d0 fs/f2fs/file.c:1838\\n vfs_fallocate+0x54b/0x6b0 fs/open.c:324\\n ksys_fallocate fs/open.c:347 [inline]\\n __do_sys_fallocate fs/open.c:355 [inline]\\n __se_sys_fallocate fs/open.c:353 [inline]\\n __x64_sys_fallocate+0xbd/0x100 fs/open.c:353\\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\\n do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nThe root cause is race condition as below:\\n- since it tries to remount rw filesystem, so that do_remount won\u0027t\\ncall sb_prepare_remount_readonly to block fallocate, there may be race\\ncondition in between remount and fallocate.\\n- in f2fs_remount(), default_options() will reset mount option to default\\none, and then update it based on result of parse_options(), so there is\\na hole which race condition can happen.\\n\\nThread A\\t\\t\\tThread B\\n- f2fs_fill_super\\n - parse_options\\n  - clear_opt(READ_EXTENT_CACHE)\\n\\n- f2fs_remount\\n - default_options\\n  - set_opt(READ_EXTENT_CACHE)\\n\\t\\t\\t\\t- f2fs_fallocate\\n\\t\\t\\t\\t - f2fs_insert_range\\n\\t\\t\\t\\t  - f2fs_drop_extent_tree\\n\\t\\t\\t\\t   - __drop_extent_tree\\n\\t\\t\\t\\t    - __may_extent_tree\\n\\t\\t\\t\\t     - test_opt(READ_EXTENT_CACHE) return true\\n\\t\\t\\t\\t    - write_lock(\u0026et-\u003elock) access NULL pointer\\n - parse_options\\n  - clear_opt(READ_EXTENT_CACHE)\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/115557cc226a927924f2d7d1980ccbf6e3b3bb36\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/458c15dfbce62c35fefd9ca637b20a051309c9f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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