WebSVN – HelenOS – Diff – /trunk/kernel/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.
 */
   
/** @addtogroup generic
 * @{
 */
 
/**
 * @file
 * @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>
 
 
/** 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((uintptr_t) 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 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_to_uspace);
   
    if (!KERNEL_ADDRESS_SPACE_SHADOWED) {
        if (overlaps((uintptr_t) 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_to_uspace = true;
   
    rc = memcpy_to_uspace(uspace_dst, src, size);
 
    THREAD->in_copy_to_uspace = false;
 
    interrupts_restore(ipl);
    return !rc ? EPERM : 0;
}
 
/** @}
 */
 

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/src/syscall/copy.c – Rev 2071 → 2089

Rev 2071		Rev 2089
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	/** @addtogroup generic	29	/** @addtogroup generic
30	* @{	30	* @{
31	*/	31	*/
32		32
33	/**	33	/**
34	* @file	34	* @file
35	* @brief Copying between kernel and userspace.	35	* @brief Copying between kernel and userspace.
36	*	36	*
37	* This file contains sanitized functions for copying data	37	* This file contains sanitized functions for copying data
38	* between kernel and userspace.	38	* between kernel and userspace.
39	*/	39	*/
40		40
41	#include <syscall/copy.h>	41	#include <syscall/copy.h>
42	#include <proc/thread.h>	42	#include <proc/thread.h>
43	#include <mm/as.h>	43	#include <mm/as.h>
44	#include <macros.h>	44	#include <macros.h>
45	#include <arch.h>	45	#include <arch.h>
46	#include <errno.h>	46	#include <errno.h>
47	#include <typedefs.h>	-
48		47
49	/** Copy data from userspace to kernel.	48	/** Copy data from userspace to kernel.
50	*	49	*
51	* Provisions are made to return value even after page fault.	50	* Provisions are made to return value even after page fault.
52	*	51	*
53	* This function can be called only from syscall.	52	* This function can be called only from syscall.
54	*	53	*
55	* @param dst Destination kernel address.	54	* @param dst Destination kernel address.
56	* @param uspace_src Source userspace address.	55	* @param uspace_src Source userspace address.
57	* @param size Size of the data to be copied.	56	* @param size Size of the data to be copied.
58	*	57	*
59	* @return 0 on success or error code from @ref errno.h.	58	* @return 0 on success or error code from @ref errno.h.
60	*/	59	*/
61	int copy_from_uspace(void dst, const void uspace_src, size_t size)	60	int copy_from_uspace(void dst, const void uspace_src, size_t size)
62	{	61	{
63	ipl_t ipl;	62	ipl_t ipl;
64	int rc;	63	int rc;
65		64
66	ASSERT(THREAD);	65	ASSERT(THREAD);
67	ASSERT(!THREAD->in_copy_from_uspace);	66	ASSERT(!THREAD->in_copy_from_uspace);
68		67
69	if (!KERNEL_ADDRESS_SPACE_SHADOWED) {	68	if (!KERNEL_ADDRESS_SPACE_SHADOWED) {
70	if (overlaps((uintptr_t) uspace_src, size,	69	if (overlaps((uintptr_t) uspace_src, size,
71	KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) {	70	KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) {
72	/*	71	/*
73	* The userspace source block conflicts with kernel address space.	72	* The userspace source block conflicts with kernel address space.
74	*/	73	*/
75	return EPERM;	74	return EPERM;
76	}	75	}
77	}	76	}
78		77
79	ipl = interrupts_disable();	78	ipl = interrupts_disable();
80	THREAD->in_copy_from_uspace = true;	79	THREAD->in_copy_from_uspace = true;
81		80
82	rc = memcpy_from_uspace(dst, uspace_src, size);	81	rc = memcpy_from_uspace(dst, uspace_src, size);
83		82
84	THREAD->in_copy_from_uspace = false;	83	THREAD->in_copy_from_uspace = false;
85		84
86	interrupts_restore(ipl);	85	interrupts_restore(ipl);
87	return !rc ? EPERM : 0;	86	return !rc ? EPERM : 0;
88	}	87	}
89		88
90	/** Copy data from kernel to userspace.	89	/** Copy data from kernel to userspace.
91	*	90	*
92	* Provisions are made to return value even after page fault.	91	* Provisions are made to return value even after page fault.
93	*	92	*
94	* This function can be called only from syscall.	93	* This function can be called only from syscall.
95	*	94	*
96	* @param uspace_dst Destination userspace address.	95	* @param uspace_dst Destination userspace address.
97	* @param src Source kernel address.	96	* @param src Source kernel address.
98	* @param size Size of the data to be copied.	97	* @param size Size of the data to be copied.
99	*	98	*
100	* @return 0 on success or error code from @ref errno.h.	99	* @return 0 on success or error code from @ref errno.h.
101	*/	100	*/
102	int copy_to_uspace(void uspace_dst, const void src, size_t size)	101	int copy_to_uspace(void uspace_dst, const void src, size_t size)
103	{	102	{
104	ipl_t ipl;	103	ipl_t ipl;
105	int rc;	104	int rc;
106		105
107	ASSERT(THREAD);	106	ASSERT(THREAD);
108	ASSERT(!THREAD->in_copy_to_uspace);	107	ASSERT(!THREAD->in_copy_to_uspace);
109		108
110	if (!KERNEL_ADDRESS_SPACE_SHADOWED) {	109	if (!KERNEL_ADDRESS_SPACE_SHADOWED) {
111	if (overlaps((uintptr_t) uspace_dst, size,	110	if (overlaps((uintptr_t) uspace_dst, size,
112	KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) {	111	KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) {
113	/*	112	/*
114	* The userspace destination block conflicts with kernel address space.	113	* The userspace destination block conflicts with kernel address space.
115	*/	114	*/
116	return EPERM;	115	return EPERM;
117	}	116	}
118	}	117	}
119		118
120	ipl = interrupts_disable();	119	ipl = interrupts_disable();
121	THREAD->in_copy_to_uspace = true;	120	THREAD->in_copy_to_uspace = true;
122		121
123	rc = memcpy_to_uspace(uspace_dst, src, size);	122	rc = memcpy_to_uspace(uspace_dst, src, size);
124		123
125	THREAD->in_copy_to_uspace = false;	124	THREAD->in_copy_to_uspace = false;
126		125
127	interrupts_restore(ipl);	126	interrupts_restore(ipl);
128	return !rc ? EPERM : 0;	127	return !rc ? EPERM : 0;
129	}	128	}
130		129
131	/** @}	130	/** @}
132	*/	131	*/
133		132