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cpuidmon.cpp
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cpuidmon.cpp
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/*********************IMPORTANT DRAKVUF LICENSE TERMS***********************
* *
* DRAKVUF (C) 2014-2024 Tamas K Lengyel. *
* Tamas K Lengyel is hereinafter referred to as the author. *
* This program is free software; you may redistribute and/or modify it *
* under the terms of the GNU General Public License as published by the *
* Free Software Foundation; Version 2 ("GPL"), BUT ONLY WITH ALL OF THE *
* CLARIFICATIONS AND EXCEPTIONS DESCRIBED HEREIN. This guarantees your *
* right to use, modify, and redistribute this software under certain *
* conditions. If you wish to embed DRAKVUF technology into proprietary *
* software, alternative licenses can be acquired from the author. *
* *
* Note that the GPL places important restrictions on "derivative works", *
* yet it does not provide a detailed definition of that term. To avoid *
* misunderstandings, we interpret that term as broadly as copyright law *
* allows. For example, we consider an application to constitute a *
* derivative work for the purpose of this license if it does any of the *
* following with any software or content covered by this license *
* ("Covered Software"): *
* *
* o Integrates source code from Covered Software. *
* *
* o Reads or includes copyrighted data files. *
* *
* o Is designed specifically to execute Covered Software and parse the *
* results (as opposed to typical shell or execution-menu apps, which will *
* execute anything you tell them to). *
* *
* o Includes Covered Software in a proprietary executable installer. The *
* installers produced by InstallShield are an example of this. Including *
* DRAKVUF with other software in compressed or archival form does not *
* trigger this provision, provided appropriate open source decompression *
* or de-archiving software is widely available for no charge. For the *
* purposes of this license, an installer is considered to include Covered *
* Software even if it actually retrieves a copy of Covered Software from *
* another source during runtime (such as by downloading it from the *
* Internet). *
* *
* o Links (statically or dynamically) to a library which does any of the *
* above. *
* *
* o Executes a helper program, module, or script to do any of the above. *
* *
* This list is not exclusive, but is meant to clarify our interpretation *
* of derived works with some common examples. Other people may interpret *
* the plain GPL differently, so we consider this a special exception to *
* the GPL that we apply to Covered Software. Works which meet any of *
* these conditions must conform to all of the terms of this license, *
* particularly including the GPL Section 3 requirements of providing *
* source code and allowing free redistribution of the work as a whole. *
* *
* Any redistribution of Covered Software, including any derived works, *
* must obey and carry forward all of the terms of this license, including *
* obeying all GPL rules and restrictions. For example, source code of *
* the whole work must be provided and free redistribution must be *
* allowed. All GPL references to "this License", are to be treated as *
* including the terms and conditions of this license text as well. *
* *
* Because this license imposes special exceptions to the GPL, Covered *
* Work may not be combined (even as part of a larger work) with plain GPL *
* software. The terms, conditions, and exceptions of this license must *
* be included as well. This license is incompatible with some other open *
* source licenses as well. In some cases we can relicense portions of *
* DRAKVUF or grant special permissions to use it in other open source *
* software. Please contact tamas.k.lengyel@gmail.com with any such *
* requests. Similarly, we don't incorporate incompatible open source *
* software into Covered Software without special permission from the *
* copyright holders. *
* *
* If you have any questions about the licensing restrictions on using *
* DRAKVUF in other works, are happy to help. As mentioned above, *
* alternative license can be requested from the author to integrate *
* DRAKVUF into proprietary applications and appliances. Please email *
* tamas.k.lengyel@gmail.com for further information. *
* *
* If you have received a written license agreement or contract for *
* Covered Software stating terms other than these, you may choose to use *
* and redistribute Covered Software under those terms instead of these. *
* *
* Source is provided to this software because we believe users have a *
* right to know exactly what a program is going to do before they run it. *
* This also allows you to audit the software for security holes. *
* *
* Source code also allows you to port DRAKVUF to new platforms, fix bugs, *
* and add new features. You are highly encouraged to submit your changes *
* on https://github.com/tklengyel/drakvuf, or by other methods. *
* By sending these changes, it is understood (unless you specify *
* otherwise) that you are offering unlimited, non-exclusive right to *
* reuse, modify, and relicense the code. DRAKVUF will always be *
* available Open Source, but this is important because the inability to *
* relicense code has caused devastating problems for other Free Software *
* projects (such as KDE and NASM). *
* To specify special license conditions of your contributions, just say *
* so when you send them. *
* *
* This program 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 DRAKVUF *
* license file for more details (it's in a COPYING file included with *
* DRAKVUF, and also available from *
* https://github.com/tklengyel/drakvuf/COPYING) *
* *
***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <inttypes.h>
#include <dirent.h>
#include <err.h>
#include "plugins/plugins.h"
#include "plugins/output_format.h"
#include "private.h"
#include "cpuidmon.h"
event_response_t cpuid_cb(drakvuf_t drakvuf, drakvuf_trap_info_t* info)
{
cpuidmon* s = (cpuidmon*)info->trap->data;
fmt::print(s->format, "cpuidmon", drakvuf, info,
keyval("VCPU", fmt::Nval(info->vcpu)),
keyval("CR3", fmt::Nval(info->regs->cr3)),
keyval("Leaf", fmt::Xval(info->cpuid->leaf)),
keyval("Subleaf", fmt::Xval(info->cpuid->subleaf)),
keyval("RAX", fmt::Xval(info->regs->rax)),
keyval("RBX", fmt::Xval(info->regs->rbx)),
keyval("RCX", fmt::Xval(info->regs->rcx)),
keyval("RDX", fmt::Xval(info->regs->rdx))
);
if ( s->stealth )
{
if ( info->cpuid->leaf == 1 )
{
info->regs->rcx &= ~0x80000000;
}
if ( info->cpuid->leaf >= 0x40000000 && info->cpuid->leaf <= 0x40000004 )
{
info->regs->rax = 0;
info->regs->rbx = 0;
info->regs->rcx = 0;
info->regs->rdx = 0;
}
}
return 0;
}
/* ----------------------------------------------------- */
cpuidmon::cpuidmon(drakvuf_t _drakvuf, bool _stealth, output_format_t _output)
: format{_output}
, drakvuf{_drakvuf}
, stealth{_stealth}
{
this->cpuid.cb = cpuid_cb;
this->cpuid.data = (void*)this;
this->cpuid.type = CPUID;
this->cpuid.name = nullptr;
this->cpuid.ttl = UNLIMITED_TTL;
this->cpuid.ah_cb = nullptr;
if ( !drakvuf_add_trap(drakvuf, &this->cpuid) )
{
fprintf(stderr, "Failed to register CPUIDMON plugin\n");
throw -1;
}
}
cpuidmon::~cpuidmon(void) {}
bool cpuidmon::stop_impl()
{
return true;
}