libvirt/src/util/virtpm.c
Stefan Berger 5ed7afa9de tpm: adapt sysfs cancel path for new TPM driver
This patch addresses BZ 1244895.

Adapt the sysfs TPM command cancel path for the TPM driver that
does not use a miscdevice anymore since Linux 4.0. Support old
and new paths and check their availability.

Add a mockup for the test cases to avoid the testing for
availability of the cancel path.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
2015-11-17 20:52:13 -05:00

79 lines
2.2 KiB
C

/*
* virtpm.c: TPM support
*
* Copyright (C) 2013 IBM Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
* Author: Stefan Berger <stefanb@linux.vnet.ibm.com>
*/
#include <config.h>
#include <sys/stat.h>
#include "virstring.h"
#include "virerror.h"
#include "viralloc.h"
#include "virfile.h"
#include "virtpm.h"
#define VIR_FROM_THIS VIR_FROM_NONE
/**
* virTPMCreateCancelPath:
* @devpath: Path to the TPM device
*
* Create the cancel path given the path to the TPM device
*/
char *
virTPMCreateCancelPath(const char *devpath)
{
char *path = NULL;
const char *dev;
const char *prefix[] = {"misc/", "tpm/"};
size_t i;
if (devpath) {
dev = strrchr(devpath, '/');
if (dev) {
dev++;
for (i = 0; i < ARRAY_CARDINALITY(prefix); i++) {
if (virAsprintf(&path, "/sys/class/%s%s/device/cancel",
prefix[i], dev) < 0)
goto cleanup;
if (virFileExists(path))
break;
VIR_FREE(path);
}
if (!path)
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("No usable sysfs TPM cancel file could be "
"found"));
} else {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("TPM device path %s is invalid"), devpath);
}
} else {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Missing TPM device path"));
}
cleanup:
return path;
}