CVE-2022-48713 perf/x86/intel/pt: Fix crash with stop filters in single-range mode

2024-06-2011:13:07

Linux

github.com

linux kernel

vulnerability

buffer variables

kernel crash

pt recording

AI Score

Confidence

High

EPSS

Percentile

15.6%

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

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.

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "670638477aed",
        "lessThan": "456f041e0359",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "670638477aed",
        "lessThan": "e83d941fd344",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "670638477aed",
        "lessThan": "feffb6ae2c80",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "670638477aed",
        "lessThan": "1d9093457b24",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "arch/x86/events/intel/pt.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.5"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.5",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "5.10.99",
        "versionType": "custom",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.22",
        "versionType": "custom",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "5.16.8",
        "versionType": "custom",
        "lessThanOrEqual": "5.16.*"
      },
      {
        "status": "unaffected",
        "version": "5.17",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "arch/x86/events/intel/pt.c"
    ],
    "defaultStatus": "affected"
  }
]