SUPDrv-linux.c@ 74430

Last change on this file since 74430 was 73542, checked in by vboxsync, 6 years ago
SUPDrv-linux.c: Reserve more exec memory space.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 44.8 KB

Line
1	/* $Rev: 73542 $ */
2	/** @file
3	* VBoxDrv - The VirtualBox Support Driver - Linux specifics.
4	*/
5
6	/*
7	* Copyright (C) 2006-2017 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#define LOG_GROUP LOG_GROUP_SUP_DRV
32	#include "../SUPDrvInternal.h"
33	#include "the-linux-kernel.h"
34	#include "version-generated.h"
35	#include "product-generated.h"
36	#include "revision-generated.h"
37
38	#include <iprt/assert.h>
39	#include <iprt/spinlock.h>
40	#include <iprt/semaphore.h>
41	#include <iprt/initterm.h>
42	#include <iprt/process.h>
43	#include <VBox/err.h>
44	#include <iprt/mem.h>
45	#include <VBox/log.h>
46	#include <iprt/mp.h>
47
48	/** @todo figure out the exact version number */
49	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 16)
50	# include <iprt/power.h>
51	# define VBOX_WITH_SUSPEND_NOTIFICATION
52	#endif
53
54	#include <linux/sched.h>
55	#include <linux/miscdevice.h>
56	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
57	# include <linux/platform_device.h>
58	#endif
59	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)) && defined(SUPDRV_WITH_MSR_PROBER)
60	# define SUPDRV_LINUX_HAS_SAFE_MSR_API
61	# include <asm/msr.h>
62	#endif
63
64	#include <asm/desc.h>
65
66	#include <iprt/asm-amd64-x86.h>
67
68
69	/*********************************************************************************************************************************
70	* Defined Constants And Macros *
71	*********************************************************************************************************************************/
72	/* check kernel version */
73	# ifndef SUPDRV_AGNOSTIC
74	# if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0)
75	# error Unsupported kernel version!
76	# endif
77	# endif
78
79	#ifdef CONFIG_X86_HIGH_ENTRY
80	# error "CONFIG_X86_HIGH_ENTRY is not supported by VBoxDrv at this time."
81	#endif
82
83	/* We cannot include x86.h, so we copy the defines we need here: */
84	#define X86_EFL_IF RT_BIT(9)
85	#define X86_EFL_AC RT_BIT(18)
86	#define X86_EFL_DF RT_BIT(10)
87	#define X86_EFL_IOPL (RT_BIT(12) \| RT_BIT(13))
88
89	/* To include the version number of VirtualBox into kernel backtraces: */
90	#define VBoxDrvLinuxVersion RT_CONCAT3(RT_CONCAT(VBOX_VERSION_MAJOR, _), \
91	RT_CONCAT(VBOX_VERSION_MINOR, _), \
92	VBOX_VERSION_BUILD)
93	#define VBoxDrvLinuxIOCtl RT_CONCAT(VBoxDrvLinuxIOCtl_,VBoxDrvLinuxVersion)
94
95
96
97	/*********************************************************************************************************************************
98	* Internal Functions *
99	*********************************************************************************************************************************/
100	static int VBoxDrvLinuxInit(void);
101	static void VBoxDrvLinuxUnload(void);
102	static int VBoxDrvLinuxCreateSys(struct inode pInode, struct file pFilp);
103	static int VBoxDrvLinuxCreateUsr(struct inode pInode, struct file pFilp);
104	static int VBoxDrvLinuxClose(struct inode pInode, struct file pFilp);
105	#ifdef HAVE_UNLOCKED_IOCTL
106	static long VBoxDrvLinuxIOCtl(struct file *pFilp, unsigned int uCmd, unsigned long ulArg);
107	#else
108	static int VBoxDrvLinuxIOCtl(struct inode pInode, struct file pFilp, unsigned int uCmd, unsigned long ulArg);
109	#endif
110	static int VBoxDrvLinuxIOCtlSlow(struct file *pFilp, unsigned int uCmd, unsigned long ulArg, PSUPDRVSESSION pSession);
111	static int VBoxDrvLinuxErr2LinuxErr(int);
112	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
113	static int VBoxDrvProbe(struct platform_device *pDev);
114	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
115	static int VBoxDrvSuspend(struct device *pDev);
116	static int VBoxDrvResume(struct device *pDev);
117	# else
118	static int VBoxDrvSuspend(struct platform_device *pDev, pm_message_t State);
119	static int VBoxDrvResume(struct platform_device *pDev);
120	# endif
121	static void VBoxDevRelease(struct device *pDev);
122	#endif
123
124
125	/*********************************************************************************************************************************
126	* Global Variables *
127	*********************************************************************************************************************************/
128	/**
129	* Device extention & session data association structure.
130	*/
131	static SUPDRVDEVEXT g_DevExt;
132
133	/** Module parameter.
134	* Not prefixed because the name is used by macros and the end of this file. */
135	static int force_async_tsc = 0;
136
137	/** The system device name. */
138	#define DEVICE_NAME_SYS "vboxdrv"
139	/** The user device name. */
140	#define DEVICE_NAME_USR "vboxdrvu"
141
142	#if (defined(RT_ARCH_AMD64) && LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 23)) \|\| defined(VBOX_WITH_TEXT_MODMEM_HACK)
143	/**
144	* Memory for the executable memory heap (in IPRT).
145	*/
146	# ifdef DEBUG
147	# define EXEC_MEMORY_SIZE 8388608 /* 8 MB */
148	# else
149	# define EXEC_MEMORY_SIZE 2097152 /* 2 MB */
150	# endif
151	extern uint8_t g_abExecMemory[EXEC_MEMORY_SIZE];
152	# ifndef VBOX_WITH_TEXT_MODMEM_HACK
153	__asm__(".section execmemory, \"awx\", @progbits\n\t"
154	".align 32\n\t"
155	".globl g_abExecMemory\n"
156	"g_abExecMemory:\n\t"
157	".zero " RT_XSTR(EXEC_MEMORY_SIZE) "\n\t"
158	".type g_abExecMemory, @object\n\t"
159	".size g_abExecMemory, " RT_XSTR(EXEC_MEMORY_SIZE) "\n\t"
160	".text\n\t");
161	# else
162	__asm__(".text\n\t"
163	".align 4096\n\t"
164	".globl g_abExecMemory\n"
165	"g_abExecMemory:\n\t"
166	".zero " RT_XSTR(EXEC_MEMORY_SIZE) "\n\t"
167	".type g_abExecMemory, @object\n\t"
168	".size g_abExecMemory, " RT_XSTR(EXEC_MEMORY_SIZE) "\n\t"
169	".text\n\t");
170	# endif
171	#endif
172
173	/** The file_operations structure. */
174	static struct file_operations gFileOpsVBoxDrvSys =
175	{
176	owner: THIS_MODULE,
177	open: VBoxDrvLinuxCreateSys,
178	release: VBoxDrvLinuxClose,
179	#ifdef HAVE_UNLOCKED_IOCTL
180	unlocked_ioctl: VBoxDrvLinuxIOCtl,
181	#else
182	ioctl: VBoxDrvLinuxIOCtl,
183	#endif
184	};
185
186	/** The file_operations structure. */
187	static struct file_operations gFileOpsVBoxDrvUsr =
188	{
189	owner: THIS_MODULE,
190	open: VBoxDrvLinuxCreateUsr,
191	release: VBoxDrvLinuxClose,
192	#ifdef HAVE_UNLOCKED_IOCTL
193	unlocked_ioctl: VBoxDrvLinuxIOCtl,
194	#else
195	ioctl: VBoxDrvLinuxIOCtl,
196	#endif
197	};
198
199	/** The miscdevice structure for vboxdrv. */
200	static struct miscdevice gMiscDeviceSys =
201	{
202	minor: MISC_DYNAMIC_MINOR,
203	name: DEVICE_NAME_SYS,
204	fops: &gFileOpsVBoxDrvSys,
205	# if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 17)
206	devfs_name: DEVICE_NAME_SYS,
207	# endif
208	};
209	/** The miscdevice structure for vboxdrvu. */
210	static struct miscdevice gMiscDeviceUsr =
211	{
212	minor: MISC_DYNAMIC_MINOR,
213	name: DEVICE_NAME_USR,
214	fops: &gFileOpsVBoxDrvUsr,
215	# if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 17)
216	devfs_name: DEVICE_NAME_USR,
217	# endif
218	};
219
220
221	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
222	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
223	static struct dev_pm_ops gPlatformPMOps =
224	{
225	.suspend = VBoxDrvSuspend, /* before entering deep sleep */
226	.resume = VBoxDrvResume, /* after wakeup from deep sleep */
227	.freeze = VBoxDrvSuspend, /* before creating hibernation image */
228	.restore = VBoxDrvResume, /* after waking up from hibernation */
229	};
230	# endif
231
232	static struct platform_driver gPlatformDriver =
233	{
234	.probe = VBoxDrvProbe,
235	# if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 30)
236	.suspend = VBoxDrvSuspend,
237	.resume = VBoxDrvResume,
238	# endif
239	/** @todo .shutdown? */
240	.driver =
241	{
242	.name = "vboxdrv",
243	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
244	.pm = &gPlatformPMOps,
245	# endif
246	}
247	};
248
249	static struct platform_device gPlatformDevice =
250	{
251	.name = "vboxdrv",
252	.dev =
253	{
254	.release = VBoxDevRelease
255	}
256	};
257	#endif /* VBOX_WITH_SUSPEND_NOTIFICATION */
258
259
260	DECLINLINE(RTUID) vboxdrvLinuxUid(void)
261	{
262	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
263	# if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
264	return from_kuid(current_user_ns(), current->cred->uid);
265	# else
266	return current->cred->uid;
267	# endif
268	#else
269	return current->uid;
270	#endif
271	}
272
273	DECLINLINE(RTGID) vboxdrvLinuxGid(void)
274	{
275	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
276	# if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
277	return from_kgid(current_user_ns(), current->cred->gid);
278	# else
279	return current->cred->gid;
280	# endif
281	#else
282	return current->gid;
283	#endif
284	}
285
286	DECLINLINE(RTUID) vboxdrvLinuxEuid(void)
287	{
288	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
289	# if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
290	return from_kuid(current_user_ns(), current->cred->euid);
291	# else
292	return current->cred->euid;
293	# endif
294	#else
295	return current->euid;
296	#endif
297	}
298
299	/**
300	* Initialize module.
301	*
302	* @returns appropriate status code.
303	*/
304	static int __init VBoxDrvLinuxInit(void)
305	{
306	int rc;
307
308	/*
309	* Check for synchronous/asynchronous TSC mode.
310	*/
311	printk(KERN_DEBUG "vboxdrv: Found %u processor cores\n", (unsigned)RTMpGetOnlineCount());
312	rc = misc_register(&gMiscDeviceSys);
313	if (rc)
314	{
315	printk(KERN_ERR "vboxdrv: Can't register system misc device! rc=%d\n", rc);
316	return rc;
317	}
318	rc = misc_register(&gMiscDeviceUsr);
319	if (rc)
320	{
321	printk(KERN_ERR "vboxdrv: Can't register user misc device! rc=%d\n", rc);
322	misc_deregister(&gMiscDeviceSys);
323	return rc;
324	}
325	if (!rc)
326	{
327	/*
328	* Initialize the runtime.
329	* On AMD64 we'll have to donate the high rwx memory block to the exec allocator.
330	*/
331	rc = RTR0Init(0);
332	if (RT_SUCCESS(rc))
333	{
334	#if (defined(RT_ARCH_AMD64) && LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 23)) \|\| defined(VBOX_WITH_TEXT_MODMEM_HACK)
335	# ifdef VBOX_WITH_TEXT_MODMEM_HACK
336	set_memory_x(&g_abExecMemory[0], sizeof(g_abExecMemory) / PAGE_SIZE);
337	set_memory_rw(&g_abExecMemory[0], sizeof(g_abExecMemory) / PAGE_SIZE);
338	# endif
339	rc = RTR0MemExecDonate(&g_abExecMemory[0], sizeof(g_abExecMemory));
340	printk(KERN_DEBUG "VBoxDrv: dbg - g_abExecMemory=%p\n", (void *)&g_abExecMemory[0]);
341	#endif
342	Log(("VBoxDrv::ModuleInit\n"));
343
344	/*
345	* Initialize the device extension.
346	*/
347	if (RT_SUCCESS(rc))
348	rc = supdrvInitDevExt(&g_DevExt, sizeof(SUPDRVSESSION));
349	if (RT_SUCCESS(rc))
350	{
351	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
352	rc = platform_driver_register(&gPlatformDriver);
353	if (rc == 0)
354	{
355	rc = platform_device_register(&gPlatformDevice);
356	if (rc == 0)
357	#endif
358	{
359	printk(KERN_INFO "vboxdrv: TSC mode is %s, tentative frequency %llu Hz\n",
360	SUPGetGIPModeName(g_DevExt.pGip), g_DevExt.pGip->u64CpuHz);
361	LogFlow(("VBoxDrv::ModuleInit returning %#x\n", rc));
362	printk(KERN_DEBUG "vboxdrv: Successfully loaded version "
363	VBOX_VERSION_STRING " (interface " RT_XSTR(SUPDRV_IOC_VERSION) ")\n");
364	return rc;
365	}
366	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
367	else
368	platform_driver_unregister(&gPlatformDriver);
369	}
370	#endif
371	}
372
373	rc = -EINVAL;
374	RTR0TermForced();
375	}
376	else
377	rc = -EINVAL;
378
379	/*
380	* Failed, cleanup and return the error code.
381	*/
382	}
383	misc_deregister(&gMiscDeviceSys);
384	misc_deregister(&gMiscDeviceUsr);
385	Log(("VBoxDrv::ModuleInit returning %#x (minor:%d & %d)\n", rc, gMiscDeviceSys.minor, gMiscDeviceUsr.minor));
386	return rc;
387	}
388
389
390	/**
391	* Unload the module.
392	*/
393	static void __exit VBoxDrvLinuxUnload(void)
394	{
395	Log(("VBoxDrvLinuxUnload\n"));
396
397	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
398	platform_device_unregister(&gPlatformDevice);
399	platform_driver_unregister(&gPlatformDriver);
400	#endif
401
402	/*
403	* I Don't think it's possible to unload a driver which processes have
404	* opened, at least we'll blindly assume that here.
405	*/
406	misc_deregister(&gMiscDeviceUsr);
407	misc_deregister(&gMiscDeviceSys);
408
409	/*
410	* Destroy GIP, delete the device extension and terminate IPRT.
411	*/
412	supdrvDeleteDevExt(&g_DevExt);
413	RTR0TermForced();
414	}
415
416
417	/**
418	* Common open code.
419	*
420	* @param pInode Pointer to inode info structure.
421	* @param pFilp Associated file pointer.
422	* @param fUnrestricted Indicates which device node which was opened.
423	*/
424	static int vboxdrvLinuxCreateCommon(struct inode pInode, struct file pFilp, bool fUnrestricted)
425	{
426	int rc;
427	PSUPDRVSESSION pSession;
428	Log(("VBoxDrvLinuxCreate: pFilp=%p pid=%d/%d %s\n", pFilp, RTProcSelf(), current->pid, current->comm));
429
430	#ifdef VBOX_WITH_HARDENING
431	/*
432	* Only root is allowed to access the unrestricted device, enforce it!
433	*/
434	if ( fUnrestricted
435	&& vboxdrvLinuxEuid() != 0 /* root */ )
436	{
437	Log(("VBoxDrvLinuxCreate: euid=%d, expected 0 (root)\n", vboxdrvLinuxEuid()));
438	return -EPERM;
439	}
440	#endif /* VBOX_WITH_HARDENING */
441
442	/*
443	* Call common code for the rest.
444	*/
445	rc = supdrvCreateSession(&g_DevExt, true /* fUser */, fUnrestricted, &pSession);
446	if (!rc)
447	{
448	pSession->Uid = vboxdrvLinuxUid();
449	pSession->Gid = vboxdrvLinuxGid();
450	}
451
452	pFilp->private_data = pSession;
453
454	Log(("VBoxDrvLinuxCreate: g_DevExt=%p pSession=%p rc=%d/%d (pid=%d/%d %s)\n",
455	&g_DevExt, pSession, rc, VBoxDrvLinuxErr2LinuxErr(rc),
456	RTProcSelf(), current->pid, current->comm));
457	return VBoxDrvLinuxErr2LinuxErr(rc);
458	}
459
460
461	/** /dev/vboxdrv. */
462	static int VBoxDrvLinuxCreateSys(struct inode pInode, struct file pFilp)
463	{
464	return vboxdrvLinuxCreateCommon(pInode, pFilp, true);
465	}
466
467
468	/** /dev/vboxdrvu. */
469	static int VBoxDrvLinuxCreateUsr(struct inode pInode, struct file pFilp)
470	{
471	return vboxdrvLinuxCreateCommon(pInode, pFilp, false);
472	}
473
474
475	/**
476	* Close device.
477	*
478	* @param pInode Pointer to inode info structure.
479	* @param pFilp Associated file pointer.
480	*/
481	static int VBoxDrvLinuxClose(struct inode pInode, struct file pFilp)
482	{
483	Log(("VBoxDrvLinuxClose: pFilp=%p pSession=%p pid=%d/%d %s\n",
484	pFilp, pFilp->private_data, RTProcSelf(), current->pid, current->comm));
485	supdrvSessionRelease((PSUPDRVSESSION)pFilp->private_data);
486	pFilp->private_data = NULL;
487	return 0;
488	}
489
490
491	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
492	/**
493	* Dummy device release function. We have to provide this function,
494	* otherwise the kernel will complain.
495	*
496	* @param pDev Pointer to the platform device.
497	*/
498	static void VBoxDevRelease(struct device *pDev)
499	{
500	}
501
502	/**
503	* Dummy probe function.
504	*
505	* @param pDev Pointer to the platform device.
506	*/
507	static int VBoxDrvProbe(struct platform_device *pDev)
508	{
509	return 0;
510	}
511
512	/**
513	* Suspend callback.
514	* @param pDev Pointer to the platform device.
515	* @param State Message type, see Documentation/power/devices.txt.
516	* Ignored.
517	*/
518	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) && !defined(DOXYGEN_RUNNING)
519	static int VBoxDrvSuspend(struct device *pDev)
520	# else
521	static int VBoxDrvSuspend(struct platform_device *pDev, pm_message_t State)
522	# endif
523	{
524	RTPowerSignalEvent(RTPOWEREVENT_SUSPEND);
525	return 0;
526	}
527
528	/**
529	* Resume callback.
530	*
531	* @param pDev Pointer to the platform device.
532	*/
533	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
534	static int VBoxDrvResume(struct device *pDev)
535	# else
536	static int VBoxDrvResume(struct platform_device *pDev)
537	# endif
538	{
539	RTPowerSignalEvent(RTPOWEREVENT_RESUME);
540	return 0;
541	}
542	#endif /* VBOX_WITH_SUSPEND_NOTIFICATION */
543
544
545	/**
546	* Device I/O Control entry point.
547	*
548	* @param pFilp Associated file pointer.
549	* @param uCmd The function specified to ioctl().
550	* @param ulArg The argument specified to ioctl().
551	*/
552	#if defined(HAVE_UNLOCKED_IOCTL) \|\| defined(DOXYGEN_RUNNING)
553	static long VBoxDrvLinuxIOCtl(struct file *pFilp, unsigned int uCmd, unsigned long ulArg)
554	#else
555	static int VBoxDrvLinuxIOCtl(struct inode pInode, struct file pFilp, unsigned int uCmd, unsigned long ulArg)
556	#endif
557	{
558	PSUPDRVSESSION pSession = (PSUPDRVSESSION)pFilp->private_data;
559	int rc;
560	#if defined(VBOX_STRICT) \|\| defined(VBOX_WITH_EFLAGS_AC_SET_IN_VBOXDRV)
561	RTCCUINTREG fSavedEfl;
562
563	/*
564	* Refuse all I/O control calls if we've ever detected EFLAGS.AC being cleared.
565	*
566	* This isn't a problem, as there is absolutely nothing in the kernel context that
567	* depend on user context triggering cleanups. That would be pretty wild, right?
568	*/
569	if (RT_UNLIKELY(g_DevExt.cBadContextCalls > 0))
570	{
571	SUPR0Printf("VBoxDrvLinuxIOCtl: EFLAGS.AC=0 detected %u times, refusing all I/O controls!\n", g_DevExt.cBadContextCalls);
572	return ESPIPE;
573	}
574
575	fSavedEfl = ASMAddFlags(X86_EFL_AC);
576	# else
577	stac();
578	# endif
579
580	/*
581	* Deal with the two high-speed IOCtl that takes it's arguments from
582	* the session and iCmd, and only returns a VBox status code.
583	*/
584	AssertCompile(_IOC_NRSHIFT == 0 && _IOC_NRBITS == 8);
585	#ifdef HAVE_UNLOCKED_IOCTL
586	if (RT_LIKELY( (unsigned int)(uCmd - SUP_IOCTL_FAST_DO_FIRST) < (unsigned int)32
587	&& pSession->fUnrestricted))
588	rc = supdrvIOCtlFast(uCmd - SUP_IOCTL_FAST_DO_FIRST, ulArg, &g_DevExt, pSession);
589	else
590	rc = VBoxDrvLinuxIOCtlSlow(pFilp, uCmd, ulArg, pSession);
591	#else /* !HAVE_UNLOCKED_IOCTL */
592	unlock_kernel();
593	if (RT_LIKELY( (unsigned int)(uCmd - SUP_IOCTL_FAST_DO_FIRST) < (unsigned int)32
594	&& pSession->fUnrestricted))
595	rc = supdrvIOCtlFast(uCmd - SUP_IOCTL_FAST_DO_FIRST, ulArg, &g_DevExt, pSession);
596	else
597	rc = VBoxDrvLinuxIOCtlSlow(pFilp, uCmd, ulArg, pSession);
598	lock_kernel();
599	#endif /* !HAVE_UNLOCKED_IOCTL */
600
601	#if defined(VBOX_STRICT) \|\| defined(VBOX_WITH_EFLAGS_AC_SET_IN_VBOXDRV)
602	/*
603	* Before we restore AC and the rest of EFLAGS, check if the IOCtl handler code
604	* accidentially modified it or some other important flag.
605	*/
606	if (RT_UNLIKELY( (ASMGetFlags() & (X86_EFL_AC \| X86_EFL_IF \| X86_EFL_DF))
607	!= ((fSavedEfl & (X86_EFL_AC \| X86_EFL_IF \| X86_EFL_DF)) \| X86_EFL_AC) ))
608	{
609	char szTmp[48];
610	RTStrPrintf(szTmp, sizeof(szTmp), "uCmd=%#x: %#x->%#x!", _IOC_NR(uCmd), (uint32_t)fSavedEfl, (uint32_t)ASMGetFlags());
611	supdrvBadContext(&g_DevExt, "SUPDrv-linux.c", __LINE__, szTmp);
612	}
613	ASMSetFlags(fSavedEfl);
614	#else
615	clac();
616	#endif
617	return rc;
618	}
619
620
621	/**
622	* Device I/O Control entry point.
623	*
624	* @param pFilp Associated file pointer.
625	* @param uCmd The function specified to ioctl().
626	* @param ulArg The argument specified to ioctl().
627	* @param pSession The session instance.
628	*/
629	static int VBoxDrvLinuxIOCtlSlow(struct file *pFilp, unsigned int uCmd, unsigned long ulArg, PSUPDRVSESSION pSession)
630	{
631	int rc;
632	SUPREQHDR Hdr;
633	PSUPREQHDR pHdr;
634	uint32_t cbBuf;
635
636	Log6(("VBoxDrvLinuxIOCtl: pFilp=%p uCmd=%#x ulArg=%p pid=%d/%d\n", pFilp, uCmd, (void *)ulArg, RTProcSelf(), current->pid));
637
638	/*
639	* Read the header.
640	*/
641	if (RT_FAILURE(RTR0MemUserCopyFrom(&Hdr, ulArg, sizeof(Hdr))))
642	{
643	Log(("VBoxDrvLinuxIOCtl: copy_from_user(,%#lx,) failed; uCmd=%#x\n", ulArg, uCmd));
644	return -EFAULT;
645	}
646	if (RT_UNLIKELY((Hdr.fFlags & SUPREQHDR_FLAGS_MAGIC_MASK) != SUPREQHDR_FLAGS_MAGIC))
647	{
648	Log(("VBoxDrvLinuxIOCtl: bad header magic %#x; uCmd=%#x\n", Hdr.fFlags & SUPREQHDR_FLAGS_MAGIC_MASK, uCmd));
649	return -EINVAL;
650	}
651
652	/*
653	* Buffer the request.
654	*/
655	cbBuf = RT_MAX(Hdr.cbIn, Hdr.cbOut);
656	if (RT_UNLIKELY(cbBuf > _1M*16))
657	{
658	Log(("VBoxDrvLinuxIOCtl: too big cbBuf=%#x; uCmd=%#x\n", cbBuf, uCmd));
659	return -E2BIG;
660	}
661	if (RT_UNLIKELY(_IOC_SIZE(uCmd) ? cbBuf != _IOC_SIZE(uCmd) : Hdr.cbIn < sizeof(Hdr)))
662	{
663	Log(("VBoxDrvLinuxIOCtl: bad ioctl cbBuf=%#x _IOC_SIZE=%#x; uCmd=%#x\n", cbBuf, _IOC_SIZE(uCmd), uCmd));
664	return -EINVAL;
665	}
666	pHdr = RTMemAlloc(cbBuf);
667	if (RT_UNLIKELY(!pHdr))
668	{
669	OSDBGPRINT(("VBoxDrvLinuxIOCtl: failed to allocate buffer of %d bytes for uCmd=%#x\n", cbBuf, uCmd));
670	return -ENOMEM;
671	}
672	if (RT_FAILURE(RTR0MemUserCopyFrom(pHdr, ulArg, Hdr.cbIn)))
673	{
674	Log(("VBoxDrvLinuxIOCtl: copy_from_user(,%#lx, %#x) failed; uCmd=%#x\n", ulArg, Hdr.cbIn, uCmd));
675	RTMemFree(pHdr);
676	return -EFAULT;
677	}
678	if (Hdr.cbIn < cbBuf)
679	RT_BZERO((uint8_t *)pHdr + Hdr.cbIn, cbBuf - Hdr.cbIn);
680
681	/*
682	* Process the IOCtl.
683	*/
684	rc = supdrvIOCtl(uCmd, &g_DevExt, pSession, pHdr, cbBuf);
685
686	/*
687	* Copy ioctl data and output buffer back to user space.
688	*/
689	if (RT_LIKELY(!rc))
690	{
691	uint32_t cbOut = pHdr->cbOut;
692	if (RT_UNLIKELY(cbOut > cbBuf))
693	{
694	OSDBGPRINT(("VBoxDrvLinuxIOCtl: too much output! %#x > %#x; uCmd=%#x!\n", cbOut, cbBuf, uCmd));
695	cbOut = cbBuf;
696	}
697	if (RT_FAILURE(RTR0MemUserCopyTo(ulArg, pHdr, cbOut)))
698	{
699	/* this is really bad! */
700	OSDBGPRINT(("VBoxDrvLinuxIOCtl: copy_to_user(%#lx,,%#x); uCmd=%#x!\n", ulArg, cbOut, uCmd));
701	rc = -EFAULT;
702	}
703	}
704	else
705	{
706	Log(("VBoxDrvLinuxIOCtl: pFilp=%p uCmd=%#x ulArg=%p failed, rc=%d\n", pFilp, uCmd, (void *)ulArg, rc));
707	rc = -EINVAL;
708	}
709	RTMemFree(pHdr);
710
711	Log6(("VBoxDrvLinuxIOCtl: returns %d (pid=%d/%d)\n", rc, RTProcSelf(), current->pid));
712	return rc;
713	}
714
715
716	/**
717	* The SUPDRV IDC entry point.
718	*
719	* @returns VBox status code, see supdrvIDC.
720	* @param uReq The request code.
721	* @param pReq The request.
722	*/
723	int VBOXCALL SUPDrvLinuxIDC(uint32_t uReq, PSUPDRVIDCREQHDR pReq)
724	{
725	PSUPDRVSESSION pSession;
726
727	/*
728	* Some quick validations.
729	*/
730	if (RT_UNLIKELY(!VALID_PTR(pReq)))
731	return VERR_INVALID_POINTER;
732
733	pSession = pReq->pSession;
734	if (pSession)
735	{
736	if (RT_UNLIKELY(!VALID_PTR(pSession)))
737	return VERR_INVALID_PARAMETER;
738	if (RT_UNLIKELY(pSession->pDevExt != &g_DevExt))
739	return VERR_INVALID_PARAMETER;
740	}
741	else if (RT_UNLIKELY(uReq != SUPDRV_IDC_REQ_CONNECT))
742	return VERR_INVALID_PARAMETER;
743
744	/*
745	* Do the job.
746	*/
747	return supdrvIDC(uReq, &g_DevExt, pSession, pReq);
748	}
749
750	EXPORT_SYMBOL(SUPDrvLinuxIDC);
751
752
753	RTCCUINTREG VBOXCALL supdrvOSChangeCR4(RTCCUINTREG fOrMask, RTCCUINTREG fAndMask)
754	{
755	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 20, 0)
756	RTCCUINTREG uOld = this_cpu_read(cpu_tlbstate.cr4);
757	RTCCUINTREG uNew = (uOld & fAndMask) \| fOrMask;
758	if (uNew != uOld)
759	{
760	this_cpu_write(cpu_tlbstate.cr4, uNew);
761	__write_cr4(uNew);
762	}
763	#else
764	RTCCUINTREG uOld = ASMGetCR4();
765	RTCCUINTREG uNew = (uOld & fAndMask) \| fOrMask;
766	if (uNew != uOld)
767	ASMSetCR4(uNew);
768	#endif
769	return uOld;
770	}
771
772
773	void VBOXCALL supdrvOSCleanupSession(PSUPDRVDEVEXT pDevExt, PSUPDRVSESSION pSession)
774	{
775	NOREF(pDevExt);
776	NOREF(pSession);
777	}
778
779
780	void VBOXCALL supdrvOSSessionHashTabInserted(PSUPDRVDEVEXT pDevExt, PSUPDRVSESSION pSession, void *pvUser)
781	{
782	NOREF(pDevExt); NOREF(pSession); NOREF(pvUser);
783	}
784
785
786	void VBOXCALL supdrvOSSessionHashTabRemoved(PSUPDRVDEVEXT pDevExt, PSUPDRVSESSION pSession, void *pvUser)
787	{
788	NOREF(pDevExt); NOREF(pSession); NOREF(pvUser);
789	}
790
791
792	/**
793	* Initializes any OS specific object creator fields.
794	*/
795	void VBOXCALL supdrvOSObjInitCreator(PSUPDRVOBJ pObj, PSUPDRVSESSION pSession)
796	{
797	NOREF(pObj);
798	NOREF(pSession);
799	}
800
801
802	/**
803	* Checks if the session can access the object.
804	*
805	* @returns true if a decision has been made.
806	* @returns false if the default access policy should be applied.
807	*
808	* @param pObj The object in question.
809	* @param pSession The session wanting to access the object.
810	* @param pszObjName The object name, can be NULL.
811	* @param prc Where to store the result when returning true.
812	*/
813	bool VBOXCALL supdrvOSObjCanAccess(PSUPDRVOBJ pObj, PSUPDRVSESSION pSession, const char pszObjName, int prc)
814	{
815	NOREF(pObj);
816	NOREF(pSession);
817	NOREF(pszObjName);
818	NOREF(prc);
819	return false;
820	}
821
822
823	bool VBOXCALL supdrvOSGetForcedAsyncTscMode(PSUPDRVDEVEXT pDevExt)
824	{
825	return force_async_tsc != 0;
826	}
827
828
829	bool VBOXCALL supdrvOSAreCpusOfflinedOnSuspend(void)
830	{
831	return true;
832	}
833
834
835	bool VBOXCALL supdrvOSAreTscDeltasInSync(void)
836	{
837	return false;
838	}
839
840
841	int VBOXCALL supdrvOSLdrOpen(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage, const char *pszFilename)
842	{
843	NOREF(pDevExt); NOREF(pImage); NOREF(pszFilename);
844	return VERR_NOT_SUPPORTED;
845	}
846
847
848	int VBOXCALL supdrvOSLdrValidatePointer(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage, void pv, const uint8_t pbImageBits)
849	{
850	NOREF(pDevExt); NOREF(pImage); NOREF(pv); NOREF(pbImageBits);
851	return VERR_NOT_SUPPORTED;
852	}
853
854
855	int VBOXCALL supdrvOSLdrLoad(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage, const uint8_t *pbImageBits, PSUPLDRLOAD pReq)
856	{
857	NOREF(pDevExt); NOREF(pImage); NOREF(pbImageBits); NOREF(pReq);
858	return VERR_NOT_SUPPORTED;
859	}
860
861
862	void VBOXCALL supdrvOSLdrUnload(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage)
863	{
864	NOREF(pDevExt); NOREF(pImage);
865	}
866
867
868	/** @def VBOX_WITH_NON_PROD_HACK_FOR_PERF_STACKS
869	* A very crude hack for debugging using perf and dtrace.
870	*
871	* DO ABSOLUTELY NOT ENABLE IN PRODUCTION BUILDS! DEVELOPMENT ONLY!!
872	* DO ABSOLUTELY NOT ENABLE IN PRODUCTION BUILDS! DEVELOPMENT ONLY!!
873	* DO ABSOLUTELY NOT ENABLE IN PRODUCTION BUILDS! DEVELOPMENT ONLY!!
874	*
875	*/
876	#if 0 \|\| defined(DOXYGEN_RUNNING)
877	# define VBOX_WITH_NON_PROD_HACK_FOR_PERF_STACKS
878	#endif
879
880	#if defined(VBOX_WITH_NON_PROD_HACK_FOR_PERF_STACKS) && defined(CONFIG_MODULES_TREE_LOOKUP)
881	/** Whether g_pfnModTreeInsert and g_pfnModTreeRemove have been initialized.
882	* @remarks can still be NULL after init. */
883	static volatile bool g_fLookedForModTreeFunctions = false;
884	static void (g_pfnModTreeInsert)(struct mod_tree_node ) = NULL; /*< __mod_tree_insert /
885	static void (g_pfnModTreeRemove)(struct mod_tree_node ) = NULL; /*< __mod_tree_remove /
886	#endif
887
888
889	void VBOXCALL supdrvOSLdrNotifyOpened(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage, const char *pszFilename)
890	{
891	#ifdef VBOX_WITH_NON_PROD_HACK_FOR_PERF_STACKS /* Not for production use!! Debugging only! */
892	/*
893	* This trick stops working with 4.2 when CONFIG_MODULES_TREE_LOOKUP is
894	* defined. The module lookups are done via a tree structure and we
895	* cannot get at the root of it. :-(
896	*/
897	# ifdef CONFIG_KALLSYMS
898	size_t const cchName = strlen(pImage->szName);
899	# endif
900	struct module pMyMod, pSelfMod, pTestMod, pTestModByName;
901	IPRT_LINUX_SAVE_EFL_AC();
902
903	pImage->pLnxModHack = NULL;
904
905	# ifdef CONFIG_MODULES_TREE_LOOKUP
906	/*
907	* This is pretty naive, but works for 4.2 on arch linux. I don't think we
908	* can count on finding __mod_tree_remove in all kernel builds as it's not
909	* marked noinline like __mod_tree_insert.
910	*/
911	if (!g_fLookedForModTreeFunctions)
912	{
913	unsigned long ulInsert = kallsyms_lookup_name("__mod_tree_insert");
914	unsigned long ulRemove = kallsyms_lookup_name("__mod_tree_remove");
915	if (!ulInsert \|\| !ulRemove)
916	{
917	g_fLookedForModTreeFunctions = true;
918	printk(KERN_ERR "vboxdrv: failed to locate __mod_tree_insert and __mod_tree_remove.\n");
919	IPRT_LINUX_RESTORE_EFL_AC();
920	return;
921	}
922	(unsigned long )&g_pfnModTreeInsert = ulInsert;
923	(unsigned long )&g_pfnModTreeRemove = ulRemove;
924	ASMCompilerBarrier();
925	g_fLookedForModTreeFunctions = true;
926	}
927	else if (!g_pfnModTreeInsert \|\| !g_pfnModTreeRemove)
928	return;
929	#endif
930
931	/*
932	* Make sure we've found our own module, otherwise we cannot access the linked list.
933	*/
934	mutex_lock(&module_mutex);
935	pSelfMod = find_module("vboxdrv");
936	mutex_unlock(&module_mutex);
937	if (!pSelfMod)
938	{
939	IPRT_LINUX_RESTORE_EFL_AC();
940	return;
941	}
942
943	/*
944	* Cook up a module structure for the image.
945	* We allocate symbol and string tables in the allocation and the module to keep things simple.
946	*/
947	# ifdef CONFIG_KALLSYMS
948	pMyMod = (struct module )RTMemAllocZ(sizeof(pMyMod)
949	+ sizeof(Elf_Sym) * 3
950	+ 1 + cchName * 2 + sizeof("_start") + sizeof("_end") + 4 );
951	# else
952	pMyMod = (struct module )RTMemAllocZ(sizeof(pMyMod));
953	# endif
954	if (pMyMod)
955	{
956	int rc = VINF_SUCCESS;
957	# ifdef CONFIG_KALLSYMS
958	Elf_Sym paSymbols = (Elf_Sym )(pMyMod + 1);
959	char pchStrTab = (char )(paSymbols + 3);
960	# endif
961
962	pMyMod->state = MODULE_STATE_LIVE;
963	INIT_LIST_HEAD(&pMyMod->list); /* just in case */
964
965	/* Perf only matches up files with a .ko extension (maybe .ko.gz),
966	so in order for this crap to work smoothly, we append .ko to the
967	module name and require the user to create symbolic links in
968	/lib/modules/`uname -r`:
969	for i in VMMR0.r0 VBoxDDR0.r0 VBoxDD2R0.r0; do
970	sudo ln -s /mnt/scratch/vbox/svn/trunk/out/linux.amd64/debug/bin/$i /lib/modules/`uname -r`/$i.ko;
971	done */
972	RTStrPrintf(pMyMod->name, sizeof(pMyMod->name), "%s", pImage->szName);
973
974	/* sysfs bits. */
975	INIT_LIST_HEAD(&pMyMod->mkobj.kobj.entry); /* rest of kobj is already zeroed, hopefully never accessed... */
976	pMyMod->mkobj.mod = pMyMod;
977	pMyMod->mkobj.drivers_dir = NULL;
978	pMyMod->mkobj.mp = NULL;
979	pMyMod->mkobj.kobj_completion = NULL;
980
981	pMyMod->modinfo_attrs = NULL; /* hopefully not accessed after setup. */
982	pMyMod->holders_dir = NULL; /* hopefully not accessed. */
983	pMyMod->version = "N/A";
984	pMyMod->srcversion = "N/A";
985
986	/* We export no symbols. */
987	pMyMod->num_syms = 0;
988	pMyMod->syms = NULL;
989	pMyMod->crcs = NULL;
990
991	pMyMod->num_gpl_syms = 0;
992	pMyMod->gpl_syms = NULL;
993	pMyMod->gpl_crcs = NULL;
994
995	pMyMod->num_gpl_future_syms = 0;
996	pMyMod->gpl_future_syms = NULL;
997	pMyMod->gpl_future_crcs = NULL;
998
999	# if CONFIG_UNUSED_SYMBOLS
1000	pMyMod->num_unused_syms = 0;
1001	pMyMod->unused_syms = NULL;
1002	pMyMod->unused_crcs = NULL;
1003
1004	pMyMod->num_unused_gpl_syms = 0;
1005	pMyMod->unused_gpl_syms = NULL;
1006	pMyMod->unused_gpl_crcs = NULL;
1007	# endif
1008	/* No kernel parameters either. */
1009	pMyMod->kp = NULL;
1010	pMyMod->num_kp = 0;
1011
1012	# ifdef CONFIG_MODULE_SIG
1013	/* Pretend ok signature. */
1014	pMyMod->sig_ok = true;
1015	# endif
1016	/* No exception table. */
1017	pMyMod->num_exentries = 0;
1018	pMyMod->extable = NULL;
1019
1020	/* No init function */
1021	pMyMod->init = NULL;
1022	pMyMod->module_init = NULL;
1023	pMyMod->init_size = 0;
1024	pMyMod->init_ro_size = 0;
1025	pMyMod->init_text_size = 0;
1026
1027	/* The module address and size. It's all text. */
1028	pMyMod->module_core = pImage->pvImage;
1029	pMyMod->core_size = pImage->cbImageBits;
1030	pMyMod->core_text_size = pImage->cbImageBits;
1031	pMyMod->core_ro_size = pImage->cbImageBits;
1032
1033	#ifdef CONFIG_MODULES_TREE_LOOKUP
1034	/* Fill in the self pointers for the tree nodes. */
1035	pMyMod->mtn_core.mod = pMyMod;
1036	pMyMod->mtn_init.mod = pMyMod;
1037	#endif
1038	/* They invented the tained bit for us, didn't they? */
1039	pMyMod->taints = 1;
1040
1041	# ifdef CONFIG_GENERIC_BUGS
1042	/* No BUGs in our modules. */
1043	pMyMod->num_bugs = 0;
1044	INIT_LIST_HEAD(&pMyMod->bug_list);
1045	pMyMod->bug_table = NULL;
1046	# endif
1047
1048	# ifdef CONFIG_KALLSYMS
1049	/* The core stuff is documented as only used when loading. So just zero them. */
1050	pMyMod->core_num_syms = 0;
1051	pMyMod->core_symtab = NULL;
1052	pMyMod->core_strtab = NULL;
1053
1054	/* Construct a symbol table with start and end symbols.
1055	Note! We don't have our own symbol table at this point, image bit
1056	are not uploaded yet! */
1057	pMyMod->num_symtab = 3;
1058	pMyMod->symtab = paSymbols;
1059	pMyMod->strtab = pchStrTab;
1060	RT_ZERO(paSymbols[0]);
1061	pchStrTab[0] = '\0';
1062	paSymbols[1].st_name = 1;
1063	paSymbols[2].st_name = 2 + RTStrPrintf(&pchStrTab[paSymbols[1].st_name], cchName + sizeof("_start"),
1064	"%s_start", pImage->szName);
1065	RTStrPrintf(&pchStrTab[paSymbols[2].st_name], cchName + sizeof("_end"), "%s_end", pImage->szName);
1066	paSymbols[1].st_info = 't';
1067	paSymbols[2].st_info = 'b';
1068	paSymbols[1].st_other = 0;
1069	paSymbols[2].st_other = 0;
1070	paSymbols[1].st_shndx = 0;
1071	paSymbols[2].st_shndx = 0;
1072	paSymbols[1].st_value = (uintptr_t)pImage->pvImage;
1073	paSymbols[2].st_value = (uintptr_t)pImage->pvImage + pImage->cbImageBits - 1;
1074	paSymbols[1].st_size = pImage->cbImageBits - 1;
1075	paSymbols[2].st_size = 1;
1076	# endif
1077	/* No arguments, but seems its always non-NULL so put empty string there. */
1078	pMyMod->args = "";
1079
1080	# ifdef CONFIG_SMP
1081	/* No per CPU data. */
1082	pMyMod->percpu = NULL;
1083	pMyMod->percpu_size = 0;
1084	# endif
1085	# ifdef CONFIG_TRACEPOINTS
1086	/* No tracepoints we like to share. */
1087	pMyMod->num_tracepoints = 0;
1088	pMyMod->tracepoints_ptrs = NULL;
1089	#endif
1090	# ifdef HAVE_JUMP_LABEL
1091	/* No jump lable stuff either. */
1092	pMyMod->jump_entries = NULL;
1093	pMyMod->num_jump_entries = 0;
1094	# endif
1095	# ifdef CONFIG_TRACING
1096	pMyMod->num_trace_bprintk_fmt = 0;
1097	pMyMod->trace_bprintk_fmt_start = NULL;
1098	# endif
1099	# ifdef CONFIG_EVENT_TRACING
1100	pMyMod->trace_events = NULL;
1101	pMyMod->num_trace_events = 0;
1102	# endif
1103	# ifdef CONFIG_FTRACE_MCOUNT_RECORD
1104	pMyMod->num_ftrace_callsites = 0;
1105	pMyMod->ftrace_callsites = NULL;
1106	# endif
1107	# ifdef CONFIG_MODULE_UNLOAD
1108	/* Dependency lists, not worth sharing */
1109	INIT_LIST_HEAD(&pMyMod->source_list);
1110	INIT_LIST_HEAD(&pMyMod->target_list);
1111
1112	/* Nobody waiting and no exit function. */
1113	# if LINUX_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
1114	pMyMod->waiter = NULL;
1115	# endif
1116	pMyMod->exit = NULL;
1117
1118	/* References, very important as we must not allow the module
1119	to be unloaded using rmmod. */
1120	# if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0)
1121	atomic_set(&pMyMod->refcnt, 42);
1122	# else
1123	pMyMod->refptr = alloc_percpu(struct module_ref);
1124	if (pMyMod->refptr)
1125	{
1126	int iCpu;
1127	for_each_possible_cpu(iCpu)
1128	{
1129	per_cpu_ptr(pMyMod->refptr, iCpu)->decs = 0;
1130	per_cpu_ptr(pMyMod->refptr, iCpu)->incs = 1;
1131	}
1132	}
1133	else
1134	rc = VERR_NO_MEMORY;
1135	# endif
1136	# endif
1137	# ifdef CONFIG_CONSTRUCTORS
1138	/* No constructors. */
1139	pMyMod->ctors = NULL;
1140	pMyMod->num_ctors = 0;
1141	# endif
1142	if (RT_SUCCESS(rc))
1143	{
1144	bool fIsModText;
1145
1146	/*
1147	* Add the module to the list.
1148	*/
1149	mutex_lock(&module_mutex);
1150	list_add_rcu(&pMyMod->list, &pSelfMod->list);
1151	pImage->pLnxModHack = pMyMod;
1152	# ifdef CONFIG_MODULES_TREE_LOOKUP
1153	g_pfnModTreeInsert(&pMyMod->mtn_core); /* __mod_tree_insert */
1154	# endif
1155	mutex_unlock(&module_mutex);
1156
1157	/*
1158	* Test it.
1159	*/
1160	mutex_lock(&module_mutex);
1161	pTestModByName = find_module(pMyMod->name);
1162	pTestMod = __module_address((uintptr_t)pImage->pvImage + pImage->cbImageBits / 4);
1163	fIsModText = __module_text_address((uintptr_t)pImage->pvImage + pImage->cbImageBits / 2);
1164	mutex_unlock(&module_mutex);
1165	if ( pTestMod == pMyMod
1166	&& pTestModByName == pMyMod
1167	&& fIsModText)
1168	printk(KERN_ERR "vboxdrv: fake module works for '%s' (%#lx to %#lx)\n",
1169	pMyMod->name, (unsigned long)paSymbols[1].st_value, (unsigned long)paSymbols[2].st_value);
1170	else
1171	printk(KERN_ERR "vboxdrv: failed to find fake module (pTestMod=%p, pTestModByName=%p, pMyMod=%p, fIsModText=%d)\n",
1172	pTestMod, pTestModByName, pMyMod, fIsModText);
1173	}
1174	else
1175	RTMemFree(pMyMod);
1176	}
1177
1178	IPRT_LINUX_RESTORE_EFL_AC();
1179	#else
1180	pImage->pLnxModHack = NULL;
1181	#endif
1182	NOREF(pDevExt); NOREF(pImage);
1183	}
1184
1185
1186	void VBOXCALL supdrvOSLdrNotifyUnloaded(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage)
1187	{
1188	#ifdef VBOX_WITH_NON_PROD_HACK_FOR_PERF_STACKS /* Not for production use!! Debugging only! */
1189	struct module *pMyMod = pImage->pLnxModHack;
1190	pImage->pLnxModHack = NULL;
1191	if (pMyMod)
1192	{
1193	/*
1194	* Remove the fake module list entry and free it.
1195	*/
1196	IPRT_LINUX_SAVE_EFL_AC();
1197	mutex_lock(&module_mutex);
1198	list_del_rcu(&pMyMod->list);
1199	# ifdef CONFIG_MODULES_TREE_LOOKUP
1200	g_pfnModTreeRemove(&pMyMod->mtn_core);
1201	# endif
1202	synchronize_sched();
1203	mutex_unlock(&module_mutex);
1204
1205	# if LINUX_VERSION_CODE < KERNEL_VERSION(3, 19, 0)
1206	free_percpu(pMyMod->refptr);
1207	# endif
1208	RTMemFree(pMyMod);
1209	IPRT_LINUX_RESTORE_EFL_AC();
1210	}
1211
1212	#else
1213	Assert(pImage->pLnxModHack == NULL);
1214	#endif
1215	NOREF(pDevExt); NOREF(pImage);
1216	}
1217
1218
1219	#ifdef SUPDRV_WITH_MSR_PROBER
1220
1221	int VBOXCALL supdrvOSMsrProberRead(uint32_t uMsr, RTCPUID idCpu, uint64_t *puValue)
1222	{
1223	# ifdef SUPDRV_LINUX_HAS_SAFE_MSR_API
1224	uint32_t u32Low, u32High;
1225	int rc;
1226
1227	IPRT_LINUX_SAVE_EFL_AC();
1228	if (idCpu == NIL_RTCPUID)
1229	rc = rdmsr_safe(uMsr, &u32Low, &u32High);
1230	else if (RTMpIsCpuOnline(idCpu))
1231	rc = rdmsr_safe_on_cpu(idCpu, uMsr, &u32Low, &u32High);
1232	else
1233	return VERR_CPU_OFFLINE;
1234	IPRT_LINUX_RESTORE_EFL_AC();
1235	if (rc == 0)
1236	{
1237	*puValue = RT_MAKE_U64(u32Low, u32High);
1238	return VINF_SUCCESS;
1239	}
1240	return VERR_ACCESS_DENIED;
1241	# else
1242	return VERR_NOT_SUPPORTED;
1243	# endif
1244	}
1245
1246
1247	int VBOXCALL supdrvOSMsrProberWrite(uint32_t uMsr, RTCPUID idCpu, uint64_t uValue)
1248	{
1249	# ifdef SUPDRV_LINUX_HAS_SAFE_MSR_API
1250	int rc;
1251
1252	IPRT_LINUX_SAVE_EFL_AC();
1253	if (idCpu == NIL_RTCPUID)
1254	rc = wrmsr_safe(uMsr, RT_LODWORD(uValue), RT_HIDWORD(uValue));
1255	else if (RTMpIsCpuOnline(idCpu))
1256	rc = wrmsr_safe_on_cpu(idCpu, uMsr, RT_LODWORD(uValue), RT_HIDWORD(uValue));
1257	else
1258	return VERR_CPU_OFFLINE;
1259	IPRT_LINUX_RESTORE_EFL_AC();
1260
1261	if (rc == 0)
1262	return VINF_SUCCESS;
1263	return VERR_ACCESS_DENIED;
1264	# else
1265	return VERR_NOT_SUPPORTED;
1266	# endif
1267	}
1268
1269	# ifdef SUPDRV_LINUX_HAS_SAFE_MSR_API
1270	/**
1271	* Worker for supdrvOSMsrProberModify.
1272	*/
1273	static DECLCALLBACK(void) supdrvLnxMsrProberModifyOnCpu(RTCPUID idCpu, void pvUser1, void pvUser2)
1274	{
1275	PSUPMSRPROBER pReq = (PSUPMSRPROBER)pvUser1;
1276	register uint32_t uMsr = pReq->u.In.uMsr;
1277	bool const fFaster = pReq->u.In.enmOp == SUPMSRPROBEROP_MODIFY_FASTER;
1278	uint64_t uBefore;
1279	uint64_t uWritten;
1280	uint64_t uAfter;
1281	int rcBefore, rcWrite, rcAfter, rcRestore;
1282	RTCCUINTREG fOldFlags;
1283
1284	/* Initialize result variables. */
1285	uBefore = uWritten = uAfter = 0;
1286	rcWrite = rcAfter = rcRestore = -EIO;
1287
1288	/*
1289	* Do the job.
1290	*/
1291	fOldFlags = ASMIntDisableFlags();
1292	ASMCompilerBarrier(); /* paranoia */
1293	if (!fFaster)
1294	ASMWriteBackAndInvalidateCaches();
1295
1296	rcBefore = rdmsrl_safe(uMsr, &uBefore);
1297	if (rcBefore >= 0)
1298	{
1299	register uint64_t uRestore = uBefore;
1300	uWritten = uRestore;
1301	uWritten &= pReq->u.In.uArgs.Modify.fAndMask;
1302	uWritten \|= pReq->u.In.uArgs.Modify.fOrMask;
1303
1304	rcWrite = wrmsr_safe(uMsr, RT_LODWORD(uWritten), RT_HIDWORD(uWritten));
1305	rcAfter = rdmsrl_safe(uMsr, &uAfter);
1306	rcRestore = wrmsr_safe(uMsr, RT_LODWORD(uRestore), RT_HIDWORD(uRestore));
1307
1308	if (!fFaster)
1309	{
1310	ASMWriteBackAndInvalidateCaches();
1311	ASMReloadCR3();
1312	ASMNopPause();
1313	}
1314	}
1315
1316	ASMCompilerBarrier(); /* paranoia */
1317	ASMSetFlags(fOldFlags);
1318
1319	/*
1320	* Write out the results.
1321	*/
1322	pReq->u.Out.uResults.Modify.uBefore = uBefore;
1323	pReq->u.Out.uResults.Modify.uWritten = uWritten;
1324	pReq->u.Out.uResults.Modify.uAfter = uAfter;
1325	pReq->u.Out.uResults.Modify.fBeforeGp = rcBefore != 0;
1326	pReq->u.Out.uResults.Modify.fModifyGp = rcWrite != 0;
1327	pReq->u.Out.uResults.Modify.fAfterGp = rcAfter != 0;
1328	pReq->u.Out.uResults.Modify.fRestoreGp = rcRestore != 0;
1329	RT_ZERO(pReq->u.Out.uResults.Modify.afReserved);
1330	}
1331	# endif
1332
1333
1334	int VBOXCALL supdrvOSMsrProberModify(RTCPUID idCpu, PSUPMSRPROBER pReq)
1335	{
1336	# ifdef SUPDRV_LINUX_HAS_SAFE_MSR_API
1337	if (idCpu == NIL_RTCPUID)
1338	{
1339	supdrvLnxMsrProberModifyOnCpu(idCpu, pReq, NULL);
1340	return VINF_SUCCESS;
1341	}
1342	return RTMpOnSpecific(idCpu, supdrvLnxMsrProberModifyOnCpu, pReq, NULL);
1343	# else
1344	return VERR_NOT_SUPPORTED;
1345	# endif
1346	}
1347
1348	#endif /* SUPDRV_WITH_MSR_PROBER */
1349
1350
1351	/**
1352	* Converts a supdrv error code to an linux error code.
1353	*
1354	* @returns corresponding linux error code.
1355	* @param rc IPRT status code.
1356	*/
1357	static int VBoxDrvLinuxErr2LinuxErr(int rc)
1358	{
1359	switch (rc)
1360	{
1361	case VINF_SUCCESS: return 0;
1362	case VERR_GENERAL_FAILURE: return -EACCES;
1363	case VERR_INVALID_PARAMETER: return -EINVAL;
1364	case VERR_INVALID_MAGIC: return -EILSEQ;
1365	case VERR_INVALID_HANDLE: return -ENXIO;
1366	case VERR_INVALID_POINTER: return -EFAULT;
1367	case VERR_LOCK_FAILED: return -ENOLCK;
1368	case VERR_ALREADY_LOADED: return -EEXIST;
1369	case VERR_PERMISSION_DENIED: return -EPERM;
1370	case VERR_VERSION_MISMATCH: return -ENOSYS;
1371	case VERR_IDT_FAILED: return -1000;
1372	}
1373
1374	return -EPERM;
1375	}
1376
1377
1378	RTDECL(int) SUPR0Printf(const char *pszFormat, ...)
1379	{
1380	va_list va;
1381	char szMsg[512];
1382	IPRT_LINUX_SAVE_EFL_AC();
1383
1384	va_start(va, pszFormat);
1385	RTStrPrintfV(szMsg, sizeof(szMsg) - 1, pszFormat, va);
1386	va_end(va);
1387	szMsg[sizeof(szMsg) - 1] = '\0';
1388
1389	printk("%s", szMsg);
1390
1391	IPRT_LINUX_RESTORE_EFL_AC();
1392	return 0;
1393	}
1394
1395
1396	SUPR0DECL(uint32_t) SUPR0GetKernelFeatures(void)
1397	{
1398	uint32_t fFlags = 0;
1399	#ifdef CONFIG_PAX_KERNEXEC
1400	fFlags \|= SUPKERNELFEATURES_GDT_READ_ONLY;
1401	#endif
1402	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0)
1403	fFlags \|= SUPKERNELFEATURES_GDT_NEED_WRITABLE;
1404	#endif
1405	#if defined(VBOX_STRICT) \|\| defined(VBOX_WITH_EFLAGS_AC_SET_IN_VBOXDRV)
1406	fFlags \|= SUPKERNELFEATURES_SMAP;
1407	#elif defined(CONFIG_X86_SMAP)
1408	if (ASMGetCR4() & X86_CR4_SMAP)
1409	fFlags \|= SUPKERNELFEATURES_SMAP;
1410	#endif
1411	return fFlags;
1412	}
1413
1414
1415	int VBOXCALL supdrvOSGetCurrentGdtRw(RTHCUINTPTR *pGdtRw)
1416	{
1417	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0)
1418	*pGdtRw = (RTHCUINTPTR)get_current_gdt_rw();
1419	return VINF_SUCCESS;
1420	#else
1421	return VERR_NOT_IMPLEMENTED;
1422	#endif
1423	}
1424
1425
1426	module_init(VBoxDrvLinuxInit);
1427	module_exit(VBoxDrvLinuxUnload);
1428
1429	MODULE_AUTHOR(VBOX_VENDOR);
1430	MODULE_DESCRIPTION(VBOX_PRODUCT " Support Driver");
1431	MODULE_LICENSE("GPL");
1432	#ifdef MODULE_VERSION
1433	MODULE_VERSION(VBOX_VERSION_STRING " r" RT_XSTR(VBOX_SVN_REV) " (" RT_XSTR(SUPDRV_IOC_VERSION) ")");
1434	#endif
1435
1436	module_param(force_async_tsc, int, 0444);
1437	MODULE_PARM_DESC(force_async_tsc, "force the asynchronous TSC mode");
1438

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source: vbox/trunk/src/VBox/HostDrivers/Support/linux/SUPDrv-linux.c@ 74430

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