uprobe: avoid out-of-bounds memory access of fetching args

{
  "id": "506958bf1f7d2fd50860ca3c5e03b79da0f1ad1d66d03e859929de662d38f2a7",
  "url": "https://osv.dev/vulnerability/CVE-2024-50067",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "uprobe: avoid out-of-bounds memory access of fetching args",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: uprobe: avoid out-of-bounds memory access of fetching args Uprobe needs to fetch args into a percpu buffer, and then copy to ring buffer to avoid non-atomic context problem. Sometimes user-space strings, arrays can be very large, but the size of percpu buffer is only page size. And store_trace_args() won't check whether these data exceeds a single page or not, caused out-of-bounds memory access. It could be reproduced by following steps: 1. build kernel with CONFIG_KASAN enabled 2. save follow program as test.c ``` \\#include \\#include \\#include // If string length large than MAX_STRING_SIZE, the fetch_store_strlen() // will return 0, cause __get_data_size() return shorter size, and // store_trace_args() will not trigger out-of-bounds access. // So make string length less than 4096. \\#define STRLEN 4093 void generate_string(char *str, int n) { int i; for (i = 0; i < n; ++i) { char c = i % 26 + 'a'; str[i] = c; } str[n-1] = '\\0'; } void print_string(char *str) { printf(\"%s\\n\", str); } int main() { char tmp[STRLEN]; generate_string(tmp, STRLEN); print_string(tmp); return 0; } ``` 3. compile program `gcc -o test test.c` 4. get the offset of `print_string()` ``` objdump -t test | grep -w print_string 0000000000401199 g F .text 000000000000001b print_string ``` 5. configure uprobe with offset 0x1199 ``` off=0x1199 cd /sys/kernel/debug/tracing/ echo \"p /root/test:${off} arg1=+0(%di):ustring arg2=\\$comm arg3=+0(%di):",
    "evidence": "osv:CVE-2024-50067",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.118",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.59",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.11.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-50067",
      "aliases": [
        "CVE-2024-50067"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "dcad1a204f72624796ae83359403898d10393b9c"
                },
                {
                  "fixed": "0dc3ad9ad2188da7f090b3dbe4d2fcd9ae8ae64f"
                },
                {
                  "fixed": "9e5f93788c9dd4309e75a56860a1ac44a8e117b9"
                },
                {
                  "fixed": "537ad4a431f6dddbf15d40d19f24bb9ee12b55cb"
                },
                {
                  "fixed": "373b9338c9722a368925d83bc622c596896b328e"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-50067.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.14.0"
                },
                {
                  "fixed": "6.1.118"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.59"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.11.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-50067.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.922517966Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0dc3ad9ad2188da7f090b3dbe4d2fcd9ae8ae64f",
        "https://git.kernel.org/stable/c/373b9338c9722a368925d83bc622c596896b328e",
        "https://git.kernel.org/stable/c/537ad4a431f6dddbf15d40d19f24bb9ee12b55cb",
        "https://git.kernel.org/stable/c/9e5f93788c9dd4309e75a56860a1ac44a8e117b9",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50067.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-50067",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50067.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-50067",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510712,
  "published_at": "2024-10-28T00:57:05.734+00:00"
}