ghsa-cfrf-95q8-jrvm
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
perf/x86/intel/pt: Fix crash with stop filters in single-range mode
Add a check for !buf->single before calling pt_buffer_region_size in a place where a missing check can cause a kernel crash.
Fixes a bug introduced by commit 670638477aed ("perf/x86/intel/pt: Opportunistically use single range output mode"), which added a support for PT single-range output mode. Since that commit if a PT stop filter range is hit while tracing, the kernel will crash because of a null pointer dereference in pt_handle_status due to calling pt_buffer_region_size without a ToPA configured.
The commit which introduced single-range mode guarded almost all uses of the ToPA buffer variables with checks of the buf->single variable, but missed the case where tracing was stopped by the PT hardware, which happens when execution hits a configured stop filter.
Tested that hitting a stop filter while PT recording successfully records a trace with this patch but crashes without this patch.
{
"affected": [],
"aliases": [
"CVE-2022-48713"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-06-20T11:15:54Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/intel/pt: Fix crash with stop filters in single-range mode\n\nAdd a check for !buf-\u003esingle before calling pt_buffer_region_size in a\nplace where a missing check can cause a kernel crash.\n\nFixes a bug introduced by commit 670638477aed (\"perf/x86/intel/pt:\nOpportunistically use single range output mode\"), which added a\nsupport for PT single-range output mode. Since that commit if a PT\nstop filter range is hit while tracing, the kernel will crash because\nof a null pointer dereference in pt_handle_status due to calling\npt_buffer_region_size without a ToPA configured.\n\nThe commit which introduced single-range mode guarded almost all uses of\nthe ToPA buffer variables with checks of the buf-\u003esingle variable, but\nmissed the case where tracing was stopped by the PT hardware, which\nhappens when execution hits a configured stop filter.\n\nTested that hitting a stop filter while PT recording successfully\nrecords a trace with this patch but crashes without this patch.",
"id": "GHSA-cfrf-95q8-jrvm",
"modified": "2024-06-20T12:31:20Z",
"published": "2024-06-20T12:31:20Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48713"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1d9093457b243061a9bba23543c38726e864a643"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/456f041e035913fcedb275aff6f8a71dfebcd394"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e83d941fd3445f660d2f43647c580a320cc384f6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/feffb6ae2c80b9a8206450cdef90f5943baced99"
}
],
"schema_version": "1.4.0",
"severity": []
}