fsnotify: clear PARENT_WATCHED flags lazily
In the Linux kernel, the following vulnerability has been resolved: fsnotify: clear PARENT_WATCHED flags lazily In some setups directories can have many (usually negative) dentries. Hence __fsnotify_update_child_dentry_flags() function can take a significant amount of time. Since the bulk of this function happens under inode->i_lock this causes a significant contention on the lock when we remove the watch from the directory as the __fsnotify_update_child_dentry_flags() call from fsnotify_recalc_mask() races with __fsnotify_update_child_dentry_flags() calls from __fsnotify_parent() happening on children. This can lead upto softlockup reports reported by users. Fix the problem by calling fsnotify_update_children_dentry_flags() to set PARENT_WATCHED flags only when parent starts watching children. When parent stops watching children, clear false positive PARENT_WATCHED flags lazily in __fsnotify_parent() for each accessed child.
CVE-2024-47660
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-2024-47660
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": "873feea09ebc980cbd3631b767356ce1eee65ec1",
"lessThan": "3f3ef1d9f66b93913ce2171120d9226b55acd41d",
"versionType": "git"
},
{
"status": "affected",
"version": "873feea09ebc980cbd3631b767356ce1eee65ec1",
"lessThan": "f9a48bc3dd9099935751458a5bbbea4b7c28abc8",
"versionType": "git"
},
{
"status": "affected",
"version": "873feea09ebc980cbd3631b767356ce1eee65ec1",
"lessThan": "d8c42405fc3507cc43ba7e4986a773c3fc633f6e",
"versionType": "git"
},
{
"status": "affected",
"version": "873feea09ebc980cbd3631b767356ce1eee65ec1",
"lessThan": "fc1b1e135c3f72382f792e6c319fc088d5523ad5",
"versionType": "git"
},
{
"status": "affected",
"version": "873feea09ebc980cbd3631b767356ce1eee65ec1",
"lessThan": "7ef1d2e240c32b1f337a37232d037b07e3919e1a",
"versionType": "git"
},
{
"status": "affected",
"version": "873feea09ebc980cbd3631b767356ce1eee65ec1",
"lessThan": "172e422ffea20a89bfdc672741c1aad6fbb5044e",
"versionType": "git"
}
],
"programFiles": [
"fs/notify/fsnotify.c",
"fs/notify/fsnotify.h",
"fs/notify/mark.c",
"include/linux/fsnotify_backend.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.38"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.38",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.226",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.167",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.109",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.50",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.10.9",
"versionType": "semver",
"lessThanOrEqual": "6.10.*"
},
{
"status": "unaffected",
"version": "6.11",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/notify/fsnotify.c",
"fs/notify/fsnotify.h",
"fs/notify/mark.c",
"include/linux/fsnotify_backend.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-47660
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #26721 · Revision 1
- Added to Heist Feed
- Publisher date