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cve416baaa9-dc9f-4396-8d5f-8c081fb06d67CVE-2024-35794
HistoryMay 17, 2024 - 1:15 p.m.

CVE-2024-35794

2024-05-1713:15:59
416baaa9-dc9f-4396-8d5f-8c081fb06d67
web.nvd.nist.gov
28
linux kernel
vulnerability
resolved
dm-raid
sync_thread
suspend
ext4
deadlock

6.6 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.5%

In the Linux kernel, the following vulnerability has been resolved:

dm-raid: really frozen sync_thread during suspend

  1. commit f52f5c71f3d4 (“md: fix stopping sync thread”) remove
    MD_RECOVERY_FROZEN from __md_stop_writes() and doesn’t realize that
    dm-raid relies on __md_stop_writes() to frozen sync_thread
    indirectly. Fix this problem by adding MD_RECOVERY_FROZEN in
    md_stop_writes(), and since stop_sync_thread() is only used for
    dm-raid in this case, also move stop_sync_thread() to
    md_stop_writes().
  2. The flag MD_RECOVERY_FROZEN doesn’t mean that sync thread is frozen,
    it only prevent new sync_thread to start, and it can’t stop the
    running sync thread; In order to frozen sync_thread, after seting the
    flag, stop_sync_thread() should be used.
  3. The flag MD_RECOVERY_FROZEN doesn’t mean that writes are stopped, use
    it as condition for md_stop_writes() in raid_postsuspend() doesn’t
    look correct. Consider that reentrant stop_sync_thread() do nothing,
    always call md_stop_writes() in raid_postsuspend().
  4. raid_message can set/clear the flag MD_RECOVERY_FROZEN at anytime,
    and if MD_RECOVERY_FROZEN is cleared while the array is suspended,
    new sync_thread can start unexpected. Fix this by disallow
    raid_message() to change sync_thread status during suspend.

Note that after commit f52f5c71f3d4 (“md: fix stopping sync thread”), the
test shell/lvconvert-raid-reshape.sh start to hang in stop_sync_thread(),
and with previous fixes, the test won’t hang there anymore, however, the
test will still fail and complain that ext4 is corrupted. And with this
patch, the test won’t hang due to stop_sync_thread() or fail due to ext4
is corrupted anymore. However, there is still a deadlock related to
dm-raid456 that will be fixed in following patches.

Affected configurations

Vulners
Node
linuxlinux_kernelRange4.86.7.12
OR
linuxlinux_kernelRange6.8.06.8.3
OR
linuxlinux_kernelRange6.9.0
VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/md/dm-raid.c",
      "drivers/md/md.c"
    ],
    "versions": [
      {
        "version": "9dbd1aa3a81c",
        "lessThan": "af916cb66a80",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9dbd1aa3a81c",
        "lessThan": "eaa8fc9b0928",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9dbd1aa3a81c",
        "lessThan": "16c4770c75b1",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/md/dm-raid.c",
      "drivers/md/md.c"
    ],
    "versions": [
      {
        "version": "4.8",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.8",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.7.12",
        "lessThanOrEqual": "6.7.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.3",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

6.6 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.5%