WebSVN – HelenOS-historic – Diff – /kernel/trunk/generic/src/syscall/copy.c


/*
 * Copyright (C) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/**
 * @file    copy.c
 * @brief   Copying between kernel and userspace.
 *
 * This file contains sanitized functions for copying data
 * between kernel and userspace.
 */
 
#include <syscall/copy.h>
#include <proc/thread.h>
#include <mm/as.h>
#include <macros.h>
#include <arch.h>
#include <errno.h>
#include <typedefs.h>
 
/** Copy data from userspace to kernel.
 *
 * Provisions are made to return value even after page fault.
 *
 * This function can be called only from syscall.
 *
 * @param dst Destination kernel address.
 * @param uspace_src Source userspace address.
 * @param size Size of the data to be copied.
 *
 * @return 0 on success or error code from @ref errno.h.
 */
int copy_from_uspace(void *dst, const void *uspace_src, size_t size)
{
    ipl_t ipl;
    int rc;
   
    ASSERT(THREAD);
    ASSERT(!THREAD->in_copy_from_uspace);
   
    if (!KERNEL_ADDRESS_SPACE_SHADOWED) {
        if (overlaps((__address) uspace_src, size,
            KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) {
            /*
             * The userspace source block conflicts with kernel address space.
             */
            return EPERM;
        }
    }
   
    ipl = interrupts_disable();
    THREAD->in_copy_from_uspace = true;
   
    rc = memcpy_from_uspace(dst, uspace_src, size);
 
    THREAD->in_copy_from_uspace = false;
 
    interrupts_restore(ipl);
    return !rc ? EPERM : 0;
}
 
/** Copy data from kernel to userspace.
 *
 * Provisions are made to return value even after page fault.
 *
 * This function can be called only from syscall.
 *
 * @param uspace_dst Destination userspace address.
 * @param uspace_src Source kernel address.
 * @param size Size of the data to be copied.
 *
 * @return 0 on success or error code from @ref errno.h.
 */
int copy_to_uspace(void *uspace_dst, const void *src, size_t size)
{
    ipl_t ipl;
    int rc;
   
    ASSERT(THREAD);
    ASSERT(!THREAD->in_copy_from_uspace);
   
    if (!KERNEL_ADDRESS_SPACE_SHADOWED) {
        if (overlaps((__address) uspace_dst, size,
            KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) {
            /*
             * The userspace destination block conflicts with kernel address space.
             */
            return EPERM;
        }
    }
   
    ipl = interrupts_disable();
    THREAD->in_copy_from_uspace = true;
   
    rc = memcpy_to_uspace(uspace_dst, src, size);
 
    THREAD->in_copy_from_uspace = false;
 
    interrupts_restore(ipl);
    return !rc ? EPERM : 0;
}
 

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/syscall/copy.c – Rev 1288 → 1293

Rev 1288		Rev 1293
1	/*	1	/*
2	* Copyright (C) 2006 Jakub Jermar	2	* Copyright (C) 2006 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/**	29	/**
30	* @file copy.c	30	* @file copy.c
31	* @brief Copying between kernel and userspace.	31	* @brief Copying between kernel and userspace.
32	*	32	*
33	* This file contains sanitized functions for copying data	33	* This file contains sanitized functions for copying data
34	* between kernel and userspace.	34	* between kernel and userspace.
35	*/	35	*/
36		36
37	#include <syscall/copy.h>	37	#include <syscall/copy.h>
38	#include <proc/thread.h>	38	#include <proc/thread.h>
39	#include <mm/as.h>	39	#include <mm/as.h>
40	#include <macros.h>	40	#include <macros.h>
41	#include <arch.h>	41	#include <arch.h>
42	#include <errno.h>	42	#include <errno.h>
43	#include <typedefs.h>	43	#include <typedefs.h>
44		44
45	/** Copy data from userspace to kernel.	45	/** Copy data from userspace to kernel.
46	*	46	*
47	* Provisions are made to return value even after page fault.	47	* Provisions are made to return value even after page fault.
48	*	48	*
49	* This function can be called only from syscall.	49	* This function can be called only from syscall.
50	*	50	*
51	* @param dst Destination kernel address.	51	* @param dst Destination kernel address.
52	* @param uspace_src Source userspace address.	52	* @param uspace_src Source userspace address.
53	* @param size Size of the data to be copied.	53	* @param size Size of the data to be copied.
54	*	54	*
55	* @return 0 on success or error code from @ref errno.h.	55	* @return 0 on success or error code from @ref errno.h.
56	*/	56	*/
57	int copy_from_uspace(void dst, void uspace_src, size_t size)	57	int copy_from_uspace(void dst, const void uspace_src, size_t size)
58	{	58	{
59	ipl_t ipl;	59	ipl_t ipl;
60	int rc;	60	int rc;
61		61
62	ASSERT(THREAD);	62	ASSERT(THREAD);
63	ASSERT(!THREAD->in_copy_from_uspace);	63	ASSERT(!THREAD->in_copy_from_uspace);
64		64
65	if (!KERNEL_ADDRESS_SPACE_SHADOWED) {	65	if (!KERNEL_ADDRESS_SPACE_SHADOWED) {
66	if (overlaps((__address) uspace_src, size,	66	if (overlaps((__address) uspace_src, size,
67	KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) {	67	KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) {
68	/*	68	/*
69	* The userspace source block conflicts with kernel address space.	69	* The userspace source block conflicts with kernel address space.
70	*/	70	*/
71	return EPERM;	71	return EPERM;
72	}	72	}
73	}	73	}
74		74
75	ipl = interrupts_disable();	75	ipl = interrupts_disable();
76	THREAD->in_copy_from_uspace = true;	76	THREAD->in_copy_from_uspace = true;
77		77
78	rc = memcpy_from_uspace(dst, uspace_src, size);	78	rc = memcpy_from_uspace(dst, uspace_src, size);
79		79
80	THREAD->in_copy_from_uspace = false;	80	THREAD->in_copy_from_uspace = false;
81		81
82	interrupts_restore(ipl);	82	interrupts_restore(ipl);
83	return !rc ? EPERM : 0;	83	return !rc ? EPERM : 0;
84	}	84	}
85		85
86	/** Copy data from kernel to userspace.	86	/** Copy data from kernel to userspace.
87	*	87	*
88	* Provisions are made to return value even after page fault.	88	* Provisions are made to return value even after page fault.
89	*	89	*
90	* This function can be called only from syscall.	90	* This function can be called only from syscall.
91	*	91	*
92	* @param uspace_dst Destination userspace address.	92	* @param uspace_dst Destination userspace address.
93	* @param uspace_src Source kernel address.	93	* @param uspace_src Source kernel address.
94	* @param size Size of the data to be copied.	94	* @param size Size of the data to be copied.
95	*	95	*
96	* @return 0 on success or error code from @ref errno.h.	96	* @return 0 on success or error code from @ref errno.h.
97	*/	97	*/
98	int copy_to_uspace(void uspace_dst, void src, size_t size)	98	int copy_to_uspace(void uspace_dst, const void src, size_t size)
99	{	99	{
100	ipl_t ipl;	100	ipl_t ipl;
101	int rc;	101	int rc;
102		102
103	ASSERT(THREAD);	103	ASSERT(THREAD);
104	ASSERT(!THREAD->in_copy_from_uspace);	104	ASSERT(!THREAD->in_copy_from_uspace);
105		105
106	if (!KERNEL_ADDRESS_SPACE_SHADOWED) {	106	if (!KERNEL_ADDRESS_SPACE_SHADOWED) {
107	if (overlaps((__address) uspace_dst, size,	107	if (overlaps((__address) uspace_dst, size,
108	KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) {	108	KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) {
109	/*	109	/*
110	* The userspace destination block conflicts with kernel address space.	110	* The userspace destination block conflicts with kernel address space.
111	*/	111	*/
112	return EPERM;	112	return EPERM;
113	}	113	}
114	}	114	}
115		115
116	ipl = interrupts_disable();	116	ipl = interrupts_disable();
117	THREAD->in_copy_from_uspace = true;	117	THREAD->in_copy_from_uspace = true;
118		118
119	rc = memcpy_to_uspace(uspace_dst, src, size);	119	rc = memcpy_to_uspace(uspace_dst, src, size);
120		120
121	THREAD->in_copy_from_uspace = false;	121	THREAD->in_copy_from_uspace = false;
122		122
123	interrupts_restore(ipl);	123	interrupts_restore(ipl);
124	return !rc ? EPERM : 0;	124	return !rc ? EPERM : 0;
125	}	125	}
126		126