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gfs2: Prevent recursive memory reclaim

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: gfs2: Prevent recursive memory reclaim Function new_inode() returns a new inode with inode->i_mapping->gfp_mask set to GFP_HIGHUSER_MOVABLE. This value includes the __GFP_FS flag, so allocations in that address space can recurse into filesystem memory reclaim. We don't want that to happen because it can consume a significant amount of stack memory. Worse than that is that it can also deadlock: for example, in several places, gfs2_unstuff_dinode() is called inside filesystem transactions. This calls filemap_grab_folio(), which can allocate a new folio, which can trigger memory reclaim. If memory reclaim recurses into the filesystem and starts another transaction, a deadlock will ensue. To fix these kinds of problems, prevent memory reclaim from recursing into filesystem code by making sure that the gfp_mask of inode address spaces doesn't include __GFP_FS. The "meta" and resource group address spaces were already using GFP_NOFS as their gfp_mask (which doesn't include __GFP_FS). The default value of GFP_HIGHUSER_MOVABLE is less restrictive than GFP_NOFS, though. To avoid being overly limiting, use the default value and only knock off the __GFP_FS flag. I'm not sure if this will actually make a difference, but it also shouldn't hurt. This patch is loosely based on commit ad22c7a043c2 ("xfs: prevent stack overflows from page cache allocation"). Fixes xfstest generic/273.

Announced Source revision 1
Original source ↗

CVE-2025-68356

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-68356

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "dc0b9435238c1a68150c798c9c7a1b5d7414cbb9",
        "lessThan": "66eb53cecc5f83183535bbfb2fa6464322049b61",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "dc0b9435238c1a68150c798c9c7a1b5d7414cbb9",
        "lessThan": "edb2b255618621dc83d0ec23150e16b2c697077f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "dc0b9435238c1a68150c798c9c7a1b5d7414cbb9",
        "lessThan": "9c0960ed112398bdb6c60ccf6e6b583bc59acede",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "dc0b9435238c1a68150c798c9c7a1b5d7414cbb9",
        "lessThan": "49e7347f4644d031306d56cb4d51e467cbdcbc69",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "dc0b9435238c1a68150c798c9c7a1b5d7414cbb9",
        "lessThan": "2c5f4a53476e3cab70adc77b38942c066bd2c17c",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/gfs2/glock.c",
      "fs/gfs2/inode.c",
      "fs/gfs2/inode.h",
      "fs/gfs2/ops_fstype.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.63",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.17.13",
        "versionType": "semver",
        "lessThanOrEqual": "6.17.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.2",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/gfs2/glock.c",
      "fs/gfs2/inode.c",
      "fs/gfs2/inode.h",
      "fs/gfs2/ops_fstype.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-68356

Source reference: /cveMetadata/cveId

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No explicit severity was provided.

Event
#46067 · Revision 1
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