SUPDrv-linux.c@ 40894

Last change on this file since 40894 was 40894, checked in by vboxsync, 13 years ago
IPRT/SUPDrv: Don't create a fixed sized heap if we don't have to, use get_vm_area and friends for each request instead.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 23.3 KB

Line
1	/* $Rev: 40894 $ */
2	/** @file
3	* VBoxDrv - The VirtualBox Support Driver - Linux specifics.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 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	* Header Files *
29	*******************************************************************************/
30	#define LOG_GROUP LOG_GROUP_SUP_DRV
31	#include "../SUPDrvInternal.h"
32	#include "the-linux-kernel.h"
33	#include "version-generated.h"
34	#include "product-generated.h"
35
36	#include <iprt/assert.h>
37	#include <iprt/spinlock.h>
38	#include <iprt/semaphore.h>
39	#include <iprt/initterm.h>
40	#include <iprt/process.h>
41	#include <VBox/err.h>
42	#include <iprt/mem.h>
43	#include <VBox/log.h>
44	#include <iprt/mp.h>
45
46	/** @todo figure out the exact version number */
47	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 16)
48	# include <iprt/power.h>
49	# define VBOX_WITH_SUSPEND_NOTIFICATION
50	#endif
51
52	#include <linux/sched.h>
53	#ifdef CONFIG_DEVFS_FS
54	# include <linux/devfs_fs_kernel.h>
55	#endif
56	#ifdef CONFIG_VBOXDRV_AS_MISC
57	# include <linux/miscdevice.h>
58	#endif
59	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
60	# include <linux/platform_device.h>
61	#endif
62
63
64	/*******************************************************************************
65	* Defined Constants And Macros *
66	*******************************************************************************/
67	/* check kernel version */
68	# ifndef SUPDRV_AGNOSTIC
69	# if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0)
70	# error Unsupported kernel version!
71	# endif
72	# endif
73
74	/* devfs defines */
75	#if defined(CONFIG_DEVFS_FS) && !defined(CONFIG_VBOXDRV_AS_MISC)
76	# ifdef VBOX_WITH_HARDENING
77	# define VBOX_DEV_FMASK (S_IWUSR \| S_IRUSR)
78	# else
79	# define VBOX_DEV_FMASK (S_IRUGO \| S_IWUGO)
80	# endif
81	#endif /* CONFIG_DEV_FS && !CONFIG_VBOXDEV_AS_MISC */
82
83	#ifdef CONFIG_X86_HIGH_ENTRY
84	# error "CONFIG_X86_HIGH_ENTRY is not supported by VBoxDrv at this time."
85	#endif
86
87	/* to include the version number of VirtualBox into kernel backtraces */
88	#define VBoxDrvLinuxVersion RT_CONCAT3(RT_CONCAT(VBOX_VERSION_MAJOR, _), \
89	RT_CONCAT(VBOX_VERSION_MINOR, _), \
90	VBOX_VERSION_BUILD)
91	#define VBoxDrvLinuxIOCtl RT_CONCAT(VBoxDrvLinuxIOCtl_,VBoxDrvLinuxVersion)
92
93	/*******************************************************************************
94	* Internal Functions *
95	*******************************************************************************/
96	static int VBoxDrvLinuxInit(void);
97	static void VBoxDrvLinuxUnload(void);
98	static int VBoxDrvLinuxCreate(struct inode pInode, struct file pFilp);
99	static int VBoxDrvLinuxClose(struct inode pInode, struct file pFilp);
100	#ifdef HAVE_UNLOCKED_IOCTL
101	static long VBoxDrvLinuxIOCtl(struct file *pFilp, unsigned int uCmd, unsigned long ulArg);
102	#else
103	static int VBoxDrvLinuxIOCtl(struct inode pInode, struct file pFilp, unsigned int uCmd, unsigned long ulArg);
104	#endif
105	static int VBoxDrvLinuxIOCtlSlow(struct file *pFilp, unsigned int uCmd, unsigned long ulArg);
106	static int VBoxDrvLinuxErr2LinuxErr(int);
107	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
108	static int VBoxDrvProbe(struct platform_device *pDev);
109	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
110	static int VBoxDrvSuspend(struct device *pDev);
111	static int VBoxDrvResume(struct device *pDev);
112	# else
113	static int VBoxDrvSuspend(struct platform_device *pDev, pm_message_t State);
114	static int VBoxDrvResume(struct platform_device *pDev);
115	# endif
116	static void VBoxDevRelease(struct device *pDev);
117	#endif
118
119
120	/*******************************************************************************
121	* Global Variables *
122	*******************************************************************************/
123	/**
124	* Device extention & session data association structure.
125	*/
126	static SUPDRVDEVEXT g_DevExt;
127
128	#ifndef CONFIG_VBOXDRV_AS_MISC
129	/** Module major number */
130	#define DEVICE_MAJOR 234
131	/** Saved major device number */
132	static int g_iModuleMajor;
133	#endif /* !CONFIG_VBOXDRV_AS_MISC */
134
135	/** Module parameter.
136	* Not prefixed because the name is used by macros and the end of this file. */
137	static int force_async_tsc = 0;
138
139	/** The module name. */
140	#define DEVICE_NAME "vboxdrv"
141
142	#if defined(RT_ARCH_AMD64) && !defined(CONFIG_DEBUG_SET_MODULE_RONX)
143	/**
144	* Memory for the executable memory heap (in IPRT).
145	*/
146	extern uint8_t g_abExecMemory[1572864]; /* 1.5 MB */
147	__asm__(".section execmemory, \"awx\", @progbits\n\t"
148	".align 32\n\t"
149	".globl g_abExecMemory\n"
150	"g_abExecMemory:\n\t"
151	".zero 1572864\n\t"
152	".type g_abExecMemory, @object\n\t"
153	".size g_abExecMemory, 1572864\n\t"
154	".text\n\t");
155	#endif
156
157	/** The file_operations structure. */
158	static struct file_operations gFileOpsVBoxDrv =
159	{
160	owner: THIS_MODULE,
161	open: VBoxDrvLinuxCreate,
162	release: VBoxDrvLinuxClose,
163	#ifdef HAVE_UNLOCKED_IOCTL
164	unlocked_ioctl: VBoxDrvLinuxIOCtl,
165	#else
166	ioctl: VBoxDrvLinuxIOCtl,
167	#endif
168	};
169
170	#ifdef CONFIG_VBOXDRV_AS_MISC
171	/** The miscdevice structure. */
172	static struct miscdevice gMiscDevice =
173	{
174	minor: MISC_DYNAMIC_MINOR,
175	name: DEVICE_NAME,
176	fops: &gFileOpsVBoxDrv,
177	# if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 17)
178	devfs_name: DEVICE_NAME,
179	# endif
180	};
181	#endif
182
183
184	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
185	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
186	static struct dev_pm_ops gPlatformPMOps =
187	{
188	.suspend = VBoxDrvSuspend, /* before entering deep sleep */
189	.resume = VBoxDrvResume, /* after wakeup from deep sleep */
190	.freeze = VBoxDrvSuspend, /* before creating hibernation image */
191	.restore = VBoxDrvResume, /* after waking up from hibernation */
192	};
193	# endif
194
195	static struct platform_driver gPlatformDriver =
196	{
197	.probe = VBoxDrvProbe,
198	# if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 30)
199	.suspend = VBoxDrvSuspend,
200	.resume = VBoxDrvResume,
201	# endif
202	/** @todo .shutdown? */
203	.driver =
204	{
205	.name = "vboxdrv",
206	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
207	.pm = &gPlatformPMOps,
208	# endif
209	}
210	};
211
212	static struct platform_device gPlatformDevice =
213	{
214	.name = "vboxdrv",
215	.dev =
216	{
217	.release = VBoxDevRelease
218	}
219	};
220	#endif /* VBOX_WITH_SUSPEND_NOTIFICATION */
221
222
223	DECLINLINE(RTUID) vboxdrvLinuxUid(void)
224	{
225	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
226	return current->cred->uid;
227	#else
228	return current->uid;
229	#endif
230	}
231
232	DECLINLINE(RTGID) vboxdrvLinuxGid(void)
233	{
234	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
235	return current->cred->gid;
236	#else
237	return current->gid;
238	#endif
239	}
240
241	DECLINLINE(RTUID) vboxdrvLinuxEuid(void)
242	{
243	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
244	return current->cred->euid;
245	#else
246	return current->euid;
247	#endif
248	}
249
250	/**
251	* Initialize module.
252	*
253	* @returns appropriate status code.
254	*/
255	static int __init VBoxDrvLinuxInit(void)
256	{
257	int rc;
258
259	/*
260	* Check for synchronous/asynchronous TSC mode.
261	*/
262	printk(KERN_DEBUG DEVICE_NAME ": Found %u processor cores.\n", (unsigned)RTMpGetOnlineCount());
263	#ifdef CONFIG_VBOXDRV_AS_MISC
264	rc = misc_register(&gMiscDevice);
265	if (rc)
266	{
267	printk(KERN_ERR DEVICE_NAME ": Can't register misc device! rc=%d\n", rc);
268	return rc;
269	}
270	#else /* !CONFIG_VBOXDRV_AS_MISC */
271	/*
272	* Register character device.
273	*/
274	g_iModuleMajor = DEVICE_MAJOR;
275	rc = register_chrdev((dev_t)g_iModuleMajor, DEVICE_NAME, &gFileOpsVBoxDrv);
276	if (rc < 0)
277	{
278	Log(("register_chrdev() failed with rc=%#x!\n", rc));
279	return rc;
280	}
281
282	/*
283	* Save returned module major number
284	*/
285	if (DEVICE_MAJOR != 0)
286	g_iModuleMajor = DEVICE_MAJOR;
287	else
288	g_iModuleMajor = rc;
289	rc = 0;
290
291	# ifdef CONFIG_DEVFS_FS
292	/*
293	* Register a device entry
294	*/
295	if (devfs_mk_cdev(MKDEV(DEVICE_MAJOR, 0), S_IFCHR \| VBOX_DEV_FMASK, DEVICE_NAME) != 0)
296	{
297	Log(("devfs_register failed!\n"));
298	rc = -EINVAL;
299	}
300	# endif
301	#endif /* !CONFIG_VBOXDRV_AS_MISC */
302	if (!rc)
303	{
304	/*
305	* Initialize the runtime.
306	* On AMD64 we'll have to donate the high rwx memory block to the exec allocator.
307	*/
308	rc = RTR0Init(0);
309	if (RT_SUCCESS(rc))
310	{
311	#if defined(RT_ARCH_AMD64) && LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 23)
312	rc = RTR0MemExecDonate(&g_abExecMemory[0], sizeof(g_abExecMemory));
313	printk(KERN_DEBUG "VBoxDrv: dbg - g_abExecMemory=%p\n", (void *)&g_abExecMemory[0]);
314	#endif
315	Log(("VBoxDrv::ModuleInit\n"));
316
317	/*
318	* Initialize the device extension.
319	*/
320	if (RT_SUCCESS(rc))
321	rc = supdrvInitDevExt(&g_DevExt, sizeof(SUPDRVSESSION));
322	if (RT_SUCCESS(rc))
323	{
324	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
325	rc = platform_driver_register(&gPlatformDriver);
326	if (rc == 0)
327	{
328	rc = platform_device_register(&gPlatformDevice);
329	if (rc == 0)
330	#endif
331	{
332	printk(KERN_INFO DEVICE_NAME ": TSC mode is %s, kernel timer mode is 'normal'.\n",
333	g_DevExt.pGip->u32Mode == SUPGIPMODE_SYNC_TSC ? "'synchronous'" : "'asynchronous'");
334	LogFlow(("VBoxDrv::ModuleInit returning %#x\n", rc));
335	printk(KERN_DEBUG DEVICE_NAME ": Successfully loaded version "
336	VBOX_VERSION_STRING " (interface " RT_XSTR(SUPDRV_IOC_VERSION) ").\n");
337	return rc;
338	}
339	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
340	else
341	platform_driver_unregister(&gPlatformDriver);
342	}
343	#endif
344	}
345
346	rc = -EINVAL;
347	RTR0TermForced();
348	}
349	else
350	rc = -EINVAL;
351
352	/*
353	* Failed, cleanup and return the error code.
354	*/
355	#if defined(CONFIG_DEVFS_FS) && !defined(CONFIG_VBOXDRV_AS_MISC)
356	devfs_remove(DEVICE_NAME);
357	#endif
358	}
359	#ifdef CONFIG_VBOXDRV_AS_MISC
360	misc_deregister(&gMiscDevice);
361	Log(("VBoxDrv::ModuleInit returning %#x (minor:%d)\n", rc, gMiscDevice.minor));
362	#else
363	unregister_chrdev(g_iModuleMajor, DEVICE_NAME);
364	Log(("VBoxDrv::ModuleInit returning %#x (major:%d)\n", rc, g_iModuleMajor));
365	#endif
366	return rc;
367	}
368
369
370	/**
371	* Unload the module.
372	*/
373	static void __exit VBoxDrvLinuxUnload(void)
374	{
375	int rc;
376	Log(("VBoxDrvLinuxUnload\n"));
377	NOREF(rc);
378
379	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
380	platform_device_unregister(&gPlatformDevice);
381	platform_driver_unregister(&gPlatformDriver);
382	#endif
383
384	/*
385	* I Don't think it's possible to unload a driver which processes have
386	* opened, at least we'll blindly assume that here.
387	*/
388	#ifdef CONFIG_VBOXDRV_AS_MISC
389	rc = misc_deregister(&gMiscDevice);
390	if (rc < 0)
391	{
392	Log(("misc_deregister failed with rc=%#x\n", rc));
393	}
394	#else /* !CONFIG_VBOXDRV_AS_MISC */
395	# ifdef CONFIG_DEVFS_FS
396	/*
397	* Unregister a device entry
398	*/
399	devfs_remove(DEVICE_NAME);
400	# endif /* devfs */
401	unregister_chrdev(g_iModuleMajor, DEVICE_NAME);
402	#endif /* !CONFIG_VBOXDRV_AS_MISC */
403
404	/*
405	* Destroy GIP, delete the device extension and terminate IPRT.
406	*/
407	supdrvDeleteDevExt(&g_DevExt);
408	RTR0TermForced();
409	}
410
411
412	/**
413	* Device open. Called on open /dev/vboxdrv
414	*
415	* @param pInode Pointer to inode info structure.
416	* @param pFilp Associated file pointer.
417	*/
418	static int VBoxDrvLinuxCreate(struct inode pInode, struct file pFilp)
419	{
420	int rc;
421	PSUPDRVSESSION pSession;
422	Log(("VBoxDrvLinuxCreate: pFilp=%p pid=%d/%d %s\n", pFilp, RTProcSelf(), current->pid, current->comm));
423
424	#ifdef VBOX_WITH_HARDENING
425	/*
426	* Only root is allowed to access the device, enforce it!
427	*/
428	if (vboxdrvLinuxEuid() != 0 /* root */ )
429	{
430	Log(("VBoxDrvLinuxCreate: euid=%d, expected 0 (root)\n", vboxdrvLinuxEuid()));
431	return -EPERM;
432	}
433	#endif /* VBOX_WITH_HARDENING */
434
435	/*
436	* Call common code for the rest.
437	*/
438	rc = supdrvCreateSession(&g_DevExt, true /* fUser */, &pSession);
439	if (!rc)
440	{
441	pSession->Uid = vboxdrvLinuxUid();
442	pSession->Gid = vboxdrvLinuxGid();
443	}
444
445	pFilp->private_data = pSession;
446
447	Log(("VBoxDrvLinuxCreate: g_DevExt=%p pSession=%p rc=%d/%d (pid=%d/%d %s)\n",
448	&g_DevExt, pSession, rc, VBoxDrvLinuxErr2LinuxErr(rc),
449	RTProcSelf(), current->pid, current->comm));
450	return VBoxDrvLinuxErr2LinuxErr(rc);
451	}
452
453
454	/**
455	* Close device.
456	*
457	* @param pInode Pointer to inode info structure.
458	* @param pFilp Associated file pointer.
459	*/
460	static int VBoxDrvLinuxClose(struct inode pInode, struct file pFilp)
461	{
462	Log(("VBoxDrvLinuxClose: pFilp=%p pSession=%p pid=%d/%d %s\n",
463	pFilp, pFilp->private_data, RTProcSelf(), current->pid, current->comm));
464	supdrvCloseSession(&g_DevExt, (PSUPDRVSESSION)pFilp->private_data);
465	pFilp->private_data = NULL;
466	return 0;
467	}
468
469
470	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
471	/**
472	* Dummy device release function. We have to provide this function,
473	* otherwise the kernel will complain.
474	*
475	* @param pDev Pointer to the platform device.
476	*/
477	static void VBoxDevRelease(struct device *pDev)
478	{
479	}
480
481	/**
482	* Dummy probe function.
483	*
484	* @param pDev Pointer to the platform device.
485	*/
486	static int VBoxDrvProbe(struct platform_device *pDev)
487	{
488	return 0;
489	}
490
491	/**
492	* Suspend callback.
493	* @param pDev Pointer to the platform device.
494	* @param State message type, see Documentation/power/devices.txt.
495	*/
496	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
497	static int VBoxDrvSuspend(struct device *pDev)
498	# else
499	static int VBoxDrvSuspend(struct platform_device *pDev, pm_message_t State)
500	# endif
501	{
502	RTPowerSignalEvent(RTPOWEREVENT_SUSPEND);
503	return 0;
504	}
505
506	/**
507	* Resume callback.
508	*
509	* @param pDev Pointer to the platform device.
510	*/
511	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
512	static int VBoxDrvResume(struct device *pDev)
513	# else
514	static int VBoxDrvResume(struct platform_device *pDev)
515	# endif
516	{
517	RTPowerSignalEvent(RTPOWEREVENT_RESUME);
518	return 0;
519	}
520	#endif /* VBOX_WITH_SUSPEND_NOTIFICATION */
521
522
523	/**
524	* Device I/O Control entry point.
525	*
526	* @param pFilp Associated file pointer.
527	* @param uCmd The function specified to ioctl().
528	* @param ulArg The argument specified to ioctl().
529	*/
530	#ifdef HAVE_UNLOCKED_IOCTL
531	static long VBoxDrvLinuxIOCtl(struct file *pFilp, unsigned int uCmd, unsigned long ulArg)
532	#else
533	static int VBoxDrvLinuxIOCtl(struct inode pInode, struct file pFilp, unsigned int uCmd, unsigned long ulArg)
534	#endif
535	{
536	/*
537	* Deal with the two high-speed IOCtl that takes it's arguments from
538	* the session and iCmd, and only returns a VBox status code.
539	*/
540	#ifdef HAVE_UNLOCKED_IOCTL
541	if (RT_LIKELY( uCmd == SUP_IOCTL_FAST_DO_RAW_RUN
542	\|\| uCmd == SUP_IOCTL_FAST_DO_HWACC_RUN
543	\|\| uCmd == SUP_IOCTL_FAST_DO_NOP))
544	return supdrvIOCtlFast(uCmd, ulArg, &g_DevExt, (PSUPDRVSESSION)pFilp->private_data);
545	return VBoxDrvLinuxIOCtlSlow(pFilp, uCmd, ulArg);
546
547	#else /* !HAVE_UNLOCKED_IOCTL */
548
549	int rc;
550	unlock_kernel();
551	if (RT_LIKELY( uCmd == SUP_IOCTL_FAST_DO_RAW_RUN
552	\|\| uCmd == SUP_IOCTL_FAST_DO_HWACC_RUN
553	\|\| uCmd == SUP_IOCTL_FAST_DO_NOP))
554	rc = supdrvIOCtlFast(uCmd, ulArg, &g_DevExt, (PSUPDRVSESSION)pFilp->private_data);
555	else
556	rc = VBoxDrvLinuxIOCtlSlow(pFilp, uCmd, ulArg);
557	lock_kernel();
558	return rc;
559	#endif /* !HAVE_UNLOCKED_IOCTL */
560	}
561
562
563	/**
564	* Device I/O Control entry point.
565	*
566	* @param pFilp Associated file pointer.
567	* @param uCmd The function specified to ioctl().
568	* @param ulArg The argument specified to ioctl().
569	*/
570	static int VBoxDrvLinuxIOCtlSlow(struct file *pFilp, unsigned int uCmd, unsigned long ulArg)
571	{
572	int rc;
573	SUPREQHDR Hdr;
574	PSUPREQHDR pHdr;
575	uint32_t cbBuf;
576
577	Log6(("VBoxDrvLinuxIOCtl: pFilp=%p uCmd=%#x ulArg=%p pid=%d/%d\n", pFilp, uCmd, (void *)ulArg, RTProcSelf(), current->pid));
578
579	/*
580	* Read the header.
581	*/
582	if (RT_UNLIKELY(copy_from_user(&Hdr, (void *)ulArg, sizeof(Hdr))))
583	{
584	Log(("VBoxDrvLinuxIOCtl: copy_from_user(,%#lx,) failed; uCmd=%#x.\n", ulArg, uCmd));
585	return -EFAULT;
586	}
587	if (RT_UNLIKELY((Hdr.fFlags & SUPREQHDR_FLAGS_MAGIC_MASK) != SUPREQHDR_FLAGS_MAGIC))
588	{
589	Log(("VBoxDrvLinuxIOCtl: bad header magic %#x; uCmd=%#x\n", Hdr.fFlags & SUPREQHDR_FLAGS_MAGIC_MASK, uCmd));
590	return -EINVAL;
591	}
592
593	/*
594	* Buffer the request.
595	*/
596	cbBuf = RT_MAX(Hdr.cbIn, Hdr.cbOut);
597	if (RT_UNLIKELY(cbBuf > _1M*16))
598	{
599	Log(("VBoxDrvLinuxIOCtl: too big cbBuf=%#x; uCmd=%#x\n", cbBuf, uCmd));
600	return -E2BIG;
601	}
602	if (RT_UNLIKELY(cbBuf != _IOC_SIZE(uCmd) && _IOC_SIZE(uCmd)))
603	{
604	Log(("VBoxDrvLinuxIOCtl: bad ioctl cbBuf=%#x _IOC_SIZE=%#x; uCmd=%#x.\n", cbBuf, _IOC_SIZE(uCmd), uCmd));
605	return -EINVAL;
606	}
607	pHdr = RTMemAlloc(cbBuf);
608	if (RT_UNLIKELY(!pHdr))
609	{
610	OSDBGPRINT(("VBoxDrvLinuxIOCtl: failed to allocate buffer of %d bytes for uCmd=%#x.\n", cbBuf, uCmd));
611	return -ENOMEM;
612	}
613	if (RT_UNLIKELY(copy_from_user(pHdr, (void *)ulArg, Hdr.cbIn)))
614	{
615	Log(("VBoxDrvLinuxIOCtl: copy_from_user(,%#lx, %#x) failed; uCmd=%#x.\n", ulArg, Hdr.cbIn, uCmd));
616	RTMemFree(pHdr);
617	return -EFAULT;
618	}
619
620	/*
621	* Process the IOCtl.
622	*/
623	rc = supdrvIOCtl(uCmd, &g_DevExt, (PSUPDRVSESSION)pFilp->private_data, pHdr);
624
625	/*
626	* Copy ioctl data and output buffer back to user space.
627	*/
628	if (RT_LIKELY(!rc))
629	{
630	uint32_t cbOut = pHdr->cbOut;
631	if (RT_UNLIKELY(cbOut > cbBuf))
632	{
633	OSDBGPRINT(("VBoxDrvLinuxIOCtl: too much output! %#x > %#x; uCmd=%#x!\n", cbOut, cbBuf, uCmd));
634	cbOut = cbBuf;
635	}
636	if (RT_UNLIKELY(copy_to_user((void *)ulArg, pHdr, cbOut)))
637	{
638	/* this is really bad! */
639	OSDBGPRINT(("VBoxDrvLinuxIOCtl: copy_to_user(%#lx,,%#x); uCmd=%#x!\n", ulArg, cbOut, uCmd));
640	rc = -EFAULT;
641	}
642	}
643	else
644	{
645	Log(("VBoxDrvLinuxIOCtl: pFilp=%p uCmd=%#x ulArg=%p failed, rc=%d\n", pFilp, uCmd, (void *)ulArg, rc));
646	rc = -EINVAL;
647	}
648	RTMemFree(pHdr);
649
650	Log6(("VBoxDrvLinuxIOCtl: returns %d (pid=%d/%d)\n", rc, RTProcSelf(), current->pid));
651	return rc;
652	}
653
654
655	/**
656	* The SUPDRV IDC entry point.
657	*
658	* @returns VBox status code, see supdrvIDC.
659	* @param iReq The request code.
660	* @param pReq The request.
661	*/
662	int VBOXCALL SUPDrvLinuxIDC(uint32_t uReq, PSUPDRVIDCREQHDR pReq)
663	{
664	PSUPDRVSESSION pSession;
665
666	/*
667	* Some quick validations.
668	*/
669	if (RT_UNLIKELY(!VALID_PTR(pReq)))
670	return VERR_INVALID_POINTER;
671
672	pSession = pReq->pSession;
673	if (pSession)
674	{
675	if (RT_UNLIKELY(!VALID_PTR(pSession)))
676	return VERR_INVALID_PARAMETER;
677	if (RT_UNLIKELY(pSession->pDevExt != &g_DevExt))
678	return VERR_INVALID_PARAMETER;
679	}
680	else if (RT_UNLIKELY(uReq != SUPDRV_IDC_REQ_CONNECT))
681	return VERR_INVALID_PARAMETER;
682
683	/*
684	* Do the job.
685	*/
686	return supdrvIDC(uReq, &g_DevExt, pSession, pReq);
687	}
688
689	EXPORT_SYMBOL(SUPDrvLinuxIDC);
690
691
692	/**
693	* Initializes any OS specific object creator fields.
694	*/
695	void VBOXCALL supdrvOSObjInitCreator(PSUPDRVOBJ pObj, PSUPDRVSESSION pSession)
696	{
697	NOREF(pObj);
698	NOREF(pSession);
699	}
700
701
702	/**
703	* Checks if the session can access the object.
704	*
705	* @returns true if a decision has been made.
706	* @returns false if the default access policy should be applied.
707	*
708	* @param pObj The object in question.
709	* @param pSession The session wanting to access the object.
710	* @param pszObjName The object name, can be NULL.
711	* @param prc Where to store the result when returning true.
712	*/
713	bool VBOXCALL supdrvOSObjCanAccess(PSUPDRVOBJ pObj, PSUPDRVSESSION pSession, const char pszObjName, int prc)
714	{
715	NOREF(pObj);
716	NOREF(pSession);
717	NOREF(pszObjName);
718	NOREF(prc);
719	return false;
720	}
721
722
723	bool VBOXCALL supdrvOSGetForcedAsyncTscMode(PSUPDRVDEVEXT pDevExt)
724	{
725	return force_async_tsc != 0;
726	}
727
728
729	int VBOXCALL supdrvOSLdrOpen(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage, const char *pszFilename)
730	{
731	NOREF(pDevExt); NOREF(pImage); NOREF(pszFilename);
732	return VERR_NOT_SUPPORTED;
733	}
734
735
736	int VBOXCALL supdrvOSLdrValidatePointer(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage, void pv, const uint8_t pbImageBits)
737	{
738	NOREF(pDevExt); NOREF(pImage); NOREF(pv); NOREF(pbImageBits);
739	return VERR_NOT_SUPPORTED;
740	}
741
742
743	int VBOXCALL supdrvOSLdrLoad(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage, const uint8_t *pbImageBits, PSUPLDRLOAD pReq)
744	{
745	NOREF(pDevExt); NOREF(pImage); NOREF(pbImageBits); NOREF(pReq);
746	return VERR_NOT_SUPPORTED;
747	}
748
749
750	void VBOXCALL supdrvOSLdrUnload(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage)
751	{
752	NOREF(pDevExt); NOREF(pImage);
753	}
754
755
756	/**
757	* Converts a supdrv error code to an linux error code.
758	*
759	* @returns corresponding linux error code.
760	* @param rc IPRT status code.
761	*/
762	static int VBoxDrvLinuxErr2LinuxErr(int rc)
763	{
764	switch (rc)
765	{
766	case VINF_SUCCESS: return 0;
767	case VERR_GENERAL_FAILURE: return -EACCES;
768	case VERR_INVALID_PARAMETER: return -EINVAL;
769	case VERR_INVALID_MAGIC: return -EILSEQ;
770	case VERR_INVALID_HANDLE: return -ENXIO;
771	case VERR_INVALID_POINTER: return -EFAULT;
772	case VERR_LOCK_FAILED: return -ENOLCK;
773	case VERR_ALREADY_LOADED: return -EEXIST;
774	case VERR_PERMISSION_DENIED: return -EPERM;
775	case VERR_VERSION_MISMATCH: return -ENOSYS;
776	case VERR_IDT_FAILED: return -1000;
777	}
778
779	return -EPERM;
780	}
781
782
783	RTDECL(int) SUPR0Printf(const char *pszFormat, ...)
784	{
785	va_list va;
786	char szMsg[512];
787
788	va_start(va, pszFormat);
789	RTStrPrintfV(szMsg, sizeof(szMsg) - 1, pszFormat, va);
790	va_end(va);
791	szMsg[sizeof(szMsg) - 1] = '\0';
792
793	printk("%s", szMsg);
794	return 0;
795	}
796
797	module_init(VBoxDrvLinuxInit);
798	module_exit(VBoxDrvLinuxUnload);
799
800	MODULE_AUTHOR(VBOX_VENDOR);
801	MODULE_DESCRIPTION(VBOX_PRODUCT " Support Driver");
802	MODULE_LICENSE("GPL");
803	#ifdef MODULE_VERSION
804	MODULE_VERSION(VBOX_VERSION_STRING " (" RT_XSTR(SUPDRV_IOC_VERSION) ")");
805	#endif
806
807	module_param(force_async_tsc, int, 0444);
808	MODULE_PARM_DESC(force_async_tsc, "force the asynchronous TSC mode");
809

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/HostDrivers/Support/linux/SUPDrv-linux.c@ 40894

Download in other formats: