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zsmalloc: fix races between asynchronous zspage free and page migration

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: zsmalloc: fix races between asynchronous zspage free and page migration The asynchronous zspage free worker tries to lock a zspage's entire page list without defending against page migration. Since pages which haven't yet been locked can concurrently migrate off the zspage page list while lock_zspage() churns away, lock_zspage() can suffer from a few different lethal races. It can lock a page which no longer belongs to the zspage and unsafely dereference page_private(), it can unsafely dereference a torn pointer to the next page (since there's a data race), and it can observe a spurious NULL pointer to the next page and thus not lock all of the zspage's pages (since a single page migration will reconstruct the entire page list, and create_page_chain() unconditionally zeroes out each list pointer in the process). Fix the races by using migrate_read_lock() in lock_zspage() to synchronize with page migration.

Announced Source revision 1
Original source ↗

CVE-2022-49554

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-2022-49554

Linux

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

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

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": "77ff465799c60294e248000cd22ae8171da3304c",
        "lessThan": "3674d8a8dadd03a447dd21069d4dacfc3399b63b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "77ff465799c60294e248000cd22ae8171da3304c",
        "lessThan": "645996efc2ae391246d595832aaa6f9d3cc338c7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "77ff465799c60294e248000cd22ae8171da3304c",
        "lessThan": "fc658c083904427abbf8f18280d517ee2668677c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "77ff465799c60294e248000cd22ae8171da3304c",
        "lessThan": "fae05b2314b147a78fbed1dc4c645d9a66313758",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "77ff465799c60294e248000cd22ae8171da3304c",
        "lessThan": "3ec459c8810e658401be428d3168eacfc380bdd0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "77ff465799c60294e248000cd22ae8171da3304c",
        "lessThan": "8ba7b7c1dad1f6503c541778f31b33f7f62eb966",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "77ff465799c60294e248000cd22ae8171da3304c",
        "lessThan": "c5402fb5f71f1a725f1e55d9c6799c0c7bec308f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "77ff465799c60294e248000cd22ae8171da3304c",
        "lessThan": "2505a981114dcb715f8977b8433f7540854851d8",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "mm/zsmalloc.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.14",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "4.14.282",
        "versionType": "semver",
        "lessThanOrEqual": "4.14.*"
      },
      {
        "status": "unaffected",
        "version": "4.19.246",
        "versionType": "semver",
        "lessThanOrEqual": "4.19.*"
      },
      {
        "status": "unaffected",
        "version": "5.4.197",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.120",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.45",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "5.17.13",
        "versionType": "semver",
        "lessThanOrEqual": "5.17.*"
      },
      {
        "status": "unaffected",
        "version": "5.18.2",
        "versionType": "semver",
        "lessThanOrEqual": "5.18.*"
      },
      {
        "status": "unaffected",
        "version": "5.19",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "mm/zsmalloc.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2022-49554

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30186 · Revision 1
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Publisher date
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