zsmalloc: fix races between asynchronous zspage free and page migration
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.
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
- Added to Heist Feed
- Publisher date