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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 | 47 | ||
48 | /** Copy data from userspace to kernel. |
48 | /** Copy data from userspace to kernel. |
49 | * |
49 | * |
50 | * Provisions are made to return value even after page fault. |
50 | * Provisions are made to return value even after page fault. |
51 | * |
51 | * |
52 | * This function can be called only from syscall. |
52 | * This function can be called only from syscall. |
53 | * |
53 | * |
54 | * @param dst Destination kernel address. |
54 | * @param dst Destination kernel address. |
55 | * @param uspace_src Source userspace address. |
55 | * @param uspace_src Source userspace address. |
56 | * @param size Size of the data to be copied. |
56 | * @param size Size of the data to be copied. |
57 | * |
57 | * |
58 | * @return 0 on success or error code from @ref errno.h. |
58 | * @return 0 on success or error code from @ref errno.h. |
59 | */ |
59 | */ |
60 | 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) |
61 | { |
61 | { |
62 | ipl_t ipl; |
62 | ipl_t ipl; |
63 | int rc; |
63 | int rc; |
64 | 64 | ||
65 | ASSERT(THREAD); |
65 | ASSERT(THREAD); |
66 | ASSERT(!THREAD->in_copy_from_uspace); |
66 | ASSERT(!THREAD->in_copy_from_uspace); |
67 | 67 | ||
68 | if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
68 | if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
69 | if (overlaps((uintptr_t) uspace_src, size, |
69 | if (overlaps((uintptr_t) uspace_src, size, |
70 | 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)) { |
71 | /* |
71 | /* |
72 | * The userspace source block conflicts with kernel address space. |
72 | * The userspace source block conflicts with kernel address space. |
73 | */ |
73 | */ |
74 | return EPERM; |
74 | return EPERM; |
75 | } |
75 | } |
76 | } |
76 | } |
77 | 77 | ||
78 | ipl = interrupts_disable(); |
78 | ipl = interrupts_disable(); |
79 | THREAD->in_copy_from_uspace = true; |
79 | THREAD->in_copy_from_uspace = true; |
80 | 80 | ||
81 | rc = memcpy_from_uspace(dst, uspace_src, size); |
81 | rc = memcpy_from_uspace(dst, uspace_src, size); |
82 | 82 | ||
83 | THREAD->in_copy_from_uspace = false; |
83 | THREAD->in_copy_from_uspace = false; |
84 | 84 | ||
85 | interrupts_restore(ipl); |
85 | interrupts_restore(ipl); |
86 | return !rc ? EPERM : 0; |
86 | return !rc ? EPERM : 0; |
87 | } |
87 | } |
88 | 88 | ||
89 | /** Copy data from kernel to userspace. |
89 | /** Copy data from kernel to userspace. |
90 | * |
90 | * |
91 | * Provisions are made to return value even after page fault. |
91 | * Provisions are made to return value even after page fault. |
92 | * |
92 | * |
93 | * This function can be called only from syscall. |
93 | * This function can be called only from syscall. |
94 | * |
94 | * |
95 | * @param uspace_dst Destination userspace address. |
95 | * @param uspace_dst Destination userspace address. |
96 | * @param src Source kernel address. |
96 | * @param src Source kernel address. |
97 | * @param size Size of the data to be copied. |
97 | * @param size Size of the data to be copied. |
98 | * |
98 | * |
99 | * @return 0 on success or error code from @ref errno.h. |
99 | * @return 0 on success or error code from @ref errno.h. |
100 | */ |
100 | */ |
101 | 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) |
102 | { |
102 | { |
103 | ipl_t ipl; |
103 | ipl_t ipl; |
104 | int rc; |
104 | int rc; |
105 | 105 | ||
106 | ASSERT(THREAD); |
106 | ASSERT(THREAD); |
107 | ASSERT(!THREAD->in_copy_to_uspace); |
107 | ASSERT(!THREAD->in_copy_to_uspace); |
108 | 108 | ||
109 | if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
109 | if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
110 | if (overlaps((uintptr_t) uspace_dst, size, |
110 | if (overlaps((uintptr_t) uspace_dst, size, |
111 | 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)) { |
112 | /* |
112 | /* |
113 | * The userspace destination block conflicts with kernel address space. |
113 | * The userspace destination block conflicts with kernel address space. |
114 | */ |
114 | */ |
115 | return EPERM; |
115 | return EPERM; |
116 | } |
116 | } |
117 | } |
117 | } |
118 | 118 | ||
119 | ipl = interrupts_disable(); |
119 | ipl = interrupts_disable(); |
120 | THREAD->in_copy_to_uspace = true; |
120 | THREAD->in_copy_to_uspace = true; |
121 | 121 | ||
122 | rc = memcpy_to_uspace(uspace_dst, src, size); |
122 | rc = memcpy_to_uspace(uspace_dst, src, size); |
123 | 123 | ||
124 | THREAD->in_copy_to_uspace = false; |
124 | THREAD->in_copy_to_uspace = false; |
125 | 125 | ||
126 | interrupts_restore(ipl); |
126 | interrupts_restore(ipl); |
127 | return !rc ? EPERM : 0; |
127 | return !rc ? EPERM : 0; |
128 | } |
128 | } |
129 | 129 | ||
130 | /** @} |
130 | /** @} |
131 | */ |
131 | */ |
132 | 132 |