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https://github.com/xen-project/xen.git
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Matthew Barnes
e42e4d8c3e
xen-hvmcrash would previously save records, overwrite the instruction pointer with a bogus value, and then restore them to crash a domain just enough to cause the guest OS to memdump. This approach is found to be unreliable when tested on a guest running Windows 10 x64, with some executions doing nothing at all. Another approach would be to trigger NMIs. This approach is found to be unreliable when tested on Linux (Ubuntu 22.04), as Linux will ignore NMIs if it is not configured to handle such. Injecting a double fault abort to all vCPUs is found to be more reliable at crashing and invoking memdumps from Windows and Linux domains. This patch modifies the xen-hvmcrash tool to inject #DF to all vCPUs belonging to the specified domain, instead of overwriting RIP. Signed-off-by: Matthew Barnes <matthew.barnes@cloud.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
/*
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* xen-hvmcrash.c
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*
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* Attempt to crash an HVM guest by injecting #DF to every vcpu
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*
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* Copyright (c) 2010 Citrix Systems, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <xenctrl.h>
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#include <xendevicemodel.h>
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#include <xen/asm/x86-defns.h>
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int
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main(int argc, char **argv)
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{
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int domid;
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xc_interface *xch;
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xendevicemodel_handle *dmod;
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xc_domaininfo_t dominfo;
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int vcpu_id, ret;
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bool injected = false;
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if (argc != 2 || !argv[1] || (domid = atoi(argv[1])) < 0) {
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fprintf(stderr, "usage: %s <domid>\n", argv[0]);
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exit(1);
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}
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xch = xc_interface_open(0, 0, 0);
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if (!xch) {
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fprintf(stderr, "error: can't open libxc handle\n");
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exit(1);
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}
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ret = xc_domain_getinfo_single(xch, domid, &dominfo);
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if (ret < 0) {
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perror("xc_domain_getinfo");
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exit(1);
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}
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if (!(dominfo.flags & XEN_DOMINF_hvm_guest)) {
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fprintf(stderr, "domain %d is not HVM\n", domid);
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exit(1);
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}
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ret = xc_domain_pause(xch, domid);
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if (ret < 0) {
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perror("xc_domain_pause");
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exit(-1);
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}
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dmod = xc_interface_dmod_handle(xch);
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for (vcpu_id = 0; vcpu_id <= dominfo.max_vcpu_id; vcpu_id++) {
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printf("Injecting #DF to vcpu ID #%d...\n", vcpu_id);
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ret = xendevicemodel_inject_event(dmod, domid, vcpu_id,
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X86_EXC_DF,
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XEN_DMOP_EVENT_hw_exc, 0, 0, 0);
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if (ret < 0) {
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fprintf(stderr, "Could not inject #DF to vcpu ID #%d: %s\n",
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vcpu_id, strerror(errno));
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continue;
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}
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injected = true;
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}
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ret = xc_domain_unpause(xch, domid);
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if (ret < 0) {
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perror("xc_domain_unpause");
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exit(1);
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}
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if (!injected) {
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fprintf(stderr, "Could not inject #DF to any vcpu!\n");
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exit(1);
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}
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return 0;
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}
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