bpf, sockmap: Prevent lock inversion deadlock in map delete elem
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Prevent lock inversion deadlock in map delete elem syzkaller started using corpuses where a BPF tracing program deletes elements from a sockmap/sockhash map. Because BPF tracing programs can be invoked from any interrupt context, locks taken during a map_delete_elem operation must be hardirq-safe. Otherwise a deadlock due to lock inversion is possible, as reported by lockdep: CPU0 CPU1 ---- ---- lock(&htab->buckets[i].lock); local_irq_disable(); lock(&host->lock); lock(&htab->buckets[i].lock); lock(&host->lock); Locks in sockmap are hardirq-unsafe by design. We expects elements to be deleted from sockmap/sockhash only in task (normal) context with interrupts enabled, or in softirq context. Detect when map_delete_elem operation is invoked from a context which is _not_ hardirq-unsafe, that is interrupts are disabled, and bail out with an error. Note that map updates are not affected by this issue. BPF verifier does not allow updating sockmap/sockhash from a BPF tracing program today.
CVE-2024-35895
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-2024-35895
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": "604326b41a6fb9b4a78b6179335decee0365cd8c",
"lessThan": "f7990498b05ac41f7d6a190dc0418ef1d21bf058",
"versionType": "git"
},
{
"status": "affected",
"version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
"lessThan": "dd54b48db0c822ae7b520bc80751f0a0a173ef75",
"versionType": "git"
},
{
"status": "affected",
"version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
"lessThan": "d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec",
"versionType": "git"
},
{
"status": "affected",
"version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
"lessThan": "a44770fed86515eedb5a7c00b787f847ebb134a5",
"versionType": "git"
},
{
"status": "affected",
"version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
"lessThan": "668b3074aa14829e2ac2759799537a93b60fef86",
"versionType": "git"
},
{
"status": "affected",
"version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
"lessThan": "6af057ccdd8e7619960aca1f0428339f213b31cd",
"versionType": "git"
},
{
"status": "affected",
"version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
"lessThan": "ff91059932401894e6c86341915615c5eb0eca48",
"versionType": "git"
}
],
"programFiles": [
"net/core/sock_map.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.20"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.274",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.215",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.154",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.85",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.26",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.8.5",
"versionType": "semver",
"lessThanOrEqual": "6.8.*"
},
{
"status": "unaffected",
"version": "6.9",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/core/sock_map.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-35895
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #26532 · Revision 1
- Added to Heist Feed
- Publisher date