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/*
* xen-hvmcrash.c
*
* Attempt to crash an HVM guest by overwriting RIP/EIP with a bogus value
*
* Copyright (c) 2010 Citrix Systems, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <xenctrl.h>
#include <xen/xen.h>
#include <xen/domctl.h>
#include <xen/hvm/save.h>
int
main(int argc, char **argv)
{
int domid;
xc_interface *xch;
xc_dominfo_t dominfo;
int ret;
uint32_t len;
uint8_t *buf;
uint32_t off;
struct hvm_save_descriptor *descriptor;
if (argc != 2 || !argv[1] || (domid = atoi(argv[1])) < 0) {
fprintf(stderr, "usage: %s <domid>\n", argv[0]);
exit(1);
}
xch = xc_interface_open(0, 0, 0);
if (!xch) {
fprintf(stderr, "error: can't open libxc handle\n");
exit(1);
}
ret = xc_domain_getinfo(xch, domid, 1, &dominfo);
if (ret < 0) {
perror("xc_domain_getinfo");
exit(1);
}
if (!dominfo.hvm) {
fprintf(stderr, "domain %d is not HVM\n", domid);
exit(1);
}
ret = xc_domain_pause(xch, domid);
if (ret < 0) {
perror("xc_domain_pause");
exit(-1);
}
/*
* Calling with zero buffer length should return the buffer length
* required.
*/
ret = xc_domain_hvm_getcontext(xch, domid, 0, 0);
if (ret < 0) {
perror("xc_domain_hvm_getcontext");
exit(1);
}
len = ret;
buf = malloc(len);
if (buf == NULL) {
perror("malloc");
exit(1);
}
ret = xc_domain_hvm_getcontext(xch, domid, buf, len);
if (ret < 0) {
perror("xc_domain_hvm_getcontext");
exit(1);
}
off = 0;
while (off < len) {
descriptor = (struct hvm_save_descriptor *)(buf + off);
off += sizeof (struct hvm_save_descriptor);
if (descriptor->typecode == HVM_SAVE_CODE(CPU)) {
HVM_SAVE_TYPE(CPU) *cpu;
/* Overwrite EIP/RIP with some recognisable but bogus value */
cpu = (HVM_SAVE_TYPE(CPU) *)(buf + off);
printf("CPU[%d]: RIP = %" PRIx64 "\n", descriptor->instance, cpu->rip);
cpu->rip = 0xf001;
} else if (descriptor->typecode == HVM_SAVE_CODE(END)) {
break;
}
off += descriptor->length;
}
ret = xc_domain_hvm_setcontext(xch, domid, buf, len);
if (ret < 0) {
perror("xc_domain_hvm_setcontext");
exit(1);
}
ret = xc_domain_unpause(xch, domid);
if (ret < 0) {
perror("xc_domain_unpause");
exit(1);
}
return 0;
}
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