CVE-2023-53791 (GCVE-0-2023-53791)

Vulnerability from cvelistv5 – Published: 2025-12-09 00:00 – Updated: 2025-12-09 00:00
VLAI?
Title
md: fix warning for holder mismatch from export_rdev()
Summary
In the Linux kernel, the following vulnerability has been resolved: md: fix warning for holder mismatch from export_rdev() Commit a1d767191096 ("md: use mddev->external to select holder in export_rdev()") fix the problem that 'claim_rdev' is used for blkdev_get_by_dev() while 'rdev' is used for blkdev_put(). However, if mddev->external is changed from 0 to 1, then 'rdev' is used for blkdev_get_by_dev() while 'claim_rdev' is used for blkdev_put(). And this problem can be reporduced reliably by following: New file: mdadm/tests/23rdev-lifetime devname=${dev0##*/} devt=`cat /sys/block/$devname/dev` pid="" runtime=2 clean_up_test() { pill -9 $pid echo clear > /sys/block/md0/md/array_state } trap 'clean_up_test' EXIT add_by_sysfs() { while true; do echo $devt > /sys/block/md0/md/new_dev done } remove_by_sysfs(){ while true; do echo remove > /sys/block/md0/md/dev-${devname}/state done } echo md0 > /sys/module/md_mod/parameters/new_array || die "create md0 failed" add_by_sysfs & pid="$pid $!" remove_by_sysfs & pid="$pid $!" sleep $runtime exit 0 Test cmd: ./test --save-logs --logdir=/tmp/ --keep-going --dev=loop --tests=23rdev-lifetime Test result: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 960 at block/bdev.c:618 blkdev_put+0x27c/0x330 Modules linked in: multipath md_mod loop CPU: 0 PID: 960 Comm: test Not tainted 6.5.0-rc2-00121-g01e55c376936-dirty #50 RIP: 0010:blkdev_put+0x27c/0x330 Call Trace: <TASK> export_rdev.isra.23+0x50/0xa0 [md_mod] mddev_unlock+0x19d/0x300 [md_mod] rdev_attr_store+0xec/0x190 [md_mod] sysfs_kf_write+0x52/0x70 kernfs_fop_write_iter+0x19a/0x2a0 vfs_write+0x3b5/0x770 ksys_write+0x74/0x150 __x64_sys_write+0x22/0x30 do_syscall_64+0x40/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd Fix the problem by recording if 'rdev' is used as holder.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a1d7671910965ca9f8f0377e7e3bfd1179fba4d8 , < 99fcd427178d0f58f5520f8f01df727f8eaeb2c7 (git)
Affected: a1d7671910965ca9f8f0377e7e3bfd1179fba4d8 , < 99892147f028d711f9d40fefad4f33632593864c (git)
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    Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.5.5 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/md.c",
            "drivers/md/md.h"
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                  "versionEndExcluding": "6.5.5",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: fix warning for holder mismatch from export_rdev()\n\nCommit a1d767191096 (\"md: use mddev-\u003eexternal to select holder in\nexport_rdev()\") fix the problem that \u0027claim_rdev\u0027 is used for\nblkdev_get_by_dev() while \u0027rdev\u0027 is used for blkdev_put().\n\nHowever, if mddev-\u003eexternal is changed from 0 to 1, then \u0027rdev\u0027 is used\nfor blkdev_get_by_dev() while \u0027claim_rdev\u0027 is used for blkdev_put(). And\nthis problem can be reporduced reliably by following:\n\nNew file: mdadm/tests/23rdev-lifetime\n\ndevname=${dev0##*/}\ndevt=`cat /sys/block/$devname/dev`\npid=\"\"\nruntime=2\n\nclean_up_test() {\n        pill -9 $pid\n        echo clear \u003e /sys/block/md0/md/array_state\n}\n\ntrap \u0027clean_up_test\u0027 EXIT\n\nadd_by_sysfs() {\n        while true; do\n                echo $devt \u003e /sys/block/md0/md/new_dev\n        done\n}\n\nremove_by_sysfs(){\n        while true; do\n                echo remove \u003e /sys/block/md0/md/dev-${devname}/state\n        done\n}\n\necho md0 \u003e /sys/module/md_mod/parameters/new_array || die \"create md0 failed\"\n\nadd_by_sysfs \u0026\npid=\"$pid $!\"\n\nremove_by_sysfs \u0026\npid=\"$pid $!\"\n\nsleep $runtime\nexit 0\n\nTest cmd:\n\n./test --save-logs --logdir=/tmp/ --keep-going --dev=loop --tests=23rdev-lifetime\n\nTest result:\n\n------------[ cut here ]------------\nWARNING: CPU: 0 PID: 960 at block/bdev.c:618 blkdev_put+0x27c/0x330\nModules linked in: multipath md_mod loop\nCPU: 0 PID: 960 Comm: test Not tainted 6.5.0-rc2-00121-g01e55c376936-dirty #50\nRIP: 0010:blkdev_put+0x27c/0x330\nCall Trace:\n \u003cTASK\u003e\n export_rdev.isra.23+0x50/0xa0 [md_mod]\n mddev_unlock+0x19d/0x300 [md_mod]\n rdev_attr_store+0xec/0x190 [md_mod]\n sysfs_kf_write+0x52/0x70\n kernfs_fop_write_iter+0x19a/0x2a0\n vfs_write+0x3b5/0x770\n ksys_write+0x74/0x150\n __x64_sys_write+0x22/0x30\n do_syscall_64+0x40/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nFix the problem by recording if \u0027rdev\u0027 is used as holder."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-09T00:00:48.301Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/99fcd427178d0f58f5520f8f01df727f8eaeb2c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/99892147f028d711f9d40fefad4f33632593864c"
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      ],
      "title": "md: fix warning for holder mismatch from export_rdev()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53791",
    "datePublished": "2025-12-09T00:00:48.301Z",
    "dateReserved": "2025-12-08T23:58:35.274Z",
    "dateUpdated": "2025-12-09T00:00:48.301Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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