CVE-2022-49554 (GCVE-0-2022-49554)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:14 – Updated: 2025-05-04 08:40
VLAI?
Title
zsmalloc: fix races between asynchronous zspage free and page migration
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 77ff465799c60294e248000cd22ae8171da3304c , < 3674d8a8dadd03a447dd21069d4dacfc3399b63b (git)
Affected: 77ff465799c60294e248000cd22ae8171da3304c , < 645996efc2ae391246d595832aaa6f9d3cc338c7 (git)
Affected: 77ff465799c60294e248000cd22ae8171da3304c , < fc658c083904427abbf8f18280d517ee2668677c (git)
Affected: 77ff465799c60294e248000cd22ae8171da3304c , < fae05b2314b147a78fbed1dc4c645d9a66313758 (git)
Affected: 77ff465799c60294e248000cd22ae8171da3304c , < 3ec459c8810e658401be428d3168eacfc380bdd0 (git)
Affected: 77ff465799c60294e248000cd22ae8171da3304c , < 8ba7b7c1dad1f6503c541778f31b33f7f62eb966 (git)
Affected: 77ff465799c60294e248000cd22ae8171da3304c , < c5402fb5f71f1a725f1e55d9c6799c0c7bec308f (git)
Affected: 77ff465799c60294e248000cd22ae8171da3304c , < 2505a981114dcb715f8977b8433f7540854851d8 (git)
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    Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 4.14.282 , ≤ 4.14.* (semver)
Unaffected: 4.19.246 , ≤ 4.19.* (semver)
Unaffected: 5.4.197 , ≤ 5.4.* (semver)
Unaffected: 5.10.120 , ≤ 5.10.* (semver)
Unaffected: 5.15.45 , ≤ 5.15.* (semver)
Unaffected: 5.17.13 , ≤ 5.17.* (semver)
Unaffected: 5.18.2 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nzsmalloc: fix races between asynchronous zspage free and page migration\n\nThe asynchronous zspage free worker tries to lock a zspage\u0027s entire page\nlist without defending against page migration.  Since pages which haven\u0027t\nyet been locked can concurrently migrate off the zspage page list while\nlock_zspage() churns away, lock_zspage() can suffer from a few different\nlethal races.\n\nIt can lock a page which no longer belongs to the zspage and unsafely\ndereference page_private(), it can unsafely dereference a torn pointer to\nthe next page (since there\u0027s a data race), and it can observe a spurious\nNULL pointer to the next page and thus not lock all of the zspage\u0027s pages\n(since a single page migration will reconstruct the entire page list, and\ncreate_page_chain() unconditionally zeroes out each list pointer in the\nprocess).\n\nFix the races by using migrate_read_lock() in lock_zspage() to synchronize\nwith page migration."
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    "datePublished": "2025-02-26T02:14:02.649Z",
    "dateReserved": "2025-02-26T02:08:31.590Z",
    "dateUpdated": "2025-05-04T08:40:26.141Z",
    "state": "PUBLISHED"
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