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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 | #include <typedefs.h> |
47 | #include <typedefs.h> |
48 | 48 | ||
49 | /** Copy data from userspace to kernel. |
49 | /** Copy data from userspace to kernel. |
50 | * |
50 | * |
51 | * Provisions are made to return value even after page fault. |
51 | * Provisions are made to return value even after page fault. |
52 | * |
52 | * |
53 | * This function can be called only from syscall. |
53 | * This function can be called only from syscall. |
54 | * |
54 | * |
55 | * @param dst Destination kernel address. |
55 | * @param dst Destination kernel address. |
56 | * @param uspace_src Source userspace address. |
56 | * @param uspace_src Source userspace address. |
57 | * @param size Size of the data to be copied. |
57 | * @param size Size of the data to be copied. |
58 | * |
58 | * |
59 | * @return 0 on success or error code from @ref errno.h. |
59 | * @return 0 on success or error code from @ref errno.h. |
60 | */ |
60 | */ |
61 | int copy_from_uspace(void *dst, const void *uspace_src, size_t size) |
61 | int copy_from_uspace(void *dst, const void *uspace_src, size_t size) |
62 | { |
62 | { |
63 | ipl_t ipl; |
63 | ipl_t ipl; |
64 | int rc; |
64 | int rc; |
65 | 65 | ||
66 | ASSERT(THREAD); |
66 | ASSERT(THREAD); |
67 | ASSERT(!THREAD->in_copy_from_uspace); |
67 | ASSERT(!THREAD->in_copy_from_uspace); |
68 | 68 | ||
69 | if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
69 | if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
70 | if (overlaps((uintptr_t) uspace_src, size, |
70 | if (overlaps((uintptr_t) uspace_src, size, |
71 | KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) { |
71 | KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) { |
72 | /* |
72 | /* |
73 | * The userspace source block conflicts with kernel address space. |
73 | * The userspace source block conflicts with kernel address space. |
74 | */ |
74 | */ |
75 | return EPERM; |
75 | return EPERM; |
76 | } |
76 | } |
77 | } |
77 | } |
78 | 78 | ||
79 | ipl = interrupts_disable(); |
79 | ipl = interrupts_disable(); |
80 | THREAD->in_copy_from_uspace = true; |
80 | THREAD->in_copy_from_uspace = true; |
81 | 81 | ||
82 | rc = memcpy_from_uspace(dst, uspace_src, size); |
82 | rc = memcpy_from_uspace(dst, uspace_src, size); |
83 | 83 | ||
84 | THREAD->in_copy_from_uspace = false; |
84 | THREAD->in_copy_from_uspace = false; |
85 | 85 | ||
86 | interrupts_restore(ipl); |
86 | interrupts_restore(ipl); |
87 | return !rc ? EPERM : 0; |
87 | return !rc ? EPERM : 0; |
88 | } |
88 | } |
89 | 89 | ||
90 | /** Copy data from kernel to userspace. |
90 | /** Copy data from kernel to userspace. |
91 | * |
91 | * |
92 | * Provisions are made to return value even after page fault. |
92 | * Provisions are made to return value even after page fault. |
93 | * |
93 | * |
94 | * This function can be called only from syscall. |
94 | * This function can be called only from syscall. |
95 | * |
95 | * |
96 | * @param uspace_dst Destination userspace address. |
96 | * @param uspace_dst Destination userspace address. |
97 | * @param src Source kernel address. |
97 | * @param src Source kernel address. |
98 | * @param size Size of the data to be copied. |
98 | * @param size Size of the data to be copied. |
99 | * |
99 | * |
100 | * @return 0 on success or error code from @ref errno.h. |
100 | * @return 0 on success or error code from @ref errno.h. |
101 | */ |
101 | */ |
102 | int copy_to_uspace(void *uspace_dst, const void *src, size_t size) |
102 | int copy_to_uspace(void *uspace_dst, const void *src, size_t size) |
103 | { |
103 | { |
104 | ipl_t ipl; |
104 | ipl_t ipl; |
105 | int rc; |
105 | int rc; |
106 | 106 | ||
107 | ASSERT(THREAD); |
107 | ASSERT(THREAD); |
108 | ASSERT(!THREAD->in_copy_from_uspace); |
108 | ASSERT(!THREAD->in_copy_from_uspace); |
109 | 109 | ||
110 | if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
110 | if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
111 | if (overlaps((uintptr_t) uspace_dst, size, |
111 | if (overlaps((uintptr_t) uspace_dst, size, |
112 | KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) { |
112 | KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) { |
113 | /* |
113 | /* |
114 | * The userspace destination block conflicts with kernel address space. |
114 | * The userspace destination block conflicts with kernel address space. |
115 | */ |
115 | */ |
116 | return EPERM; |
116 | return EPERM; |
117 | } |
117 | } |
118 | } |
118 | } |
119 | 119 | ||
120 | ipl = interrupts_disable(); |
120 | ipl = interrupts_disable(); |
121 | THREAD->in_copy_from_uspace = true; |
121 | THREAD->in_copy_from_uspace = true; |
122 | 122 | ||
123 | rc = memcpy_to_uspace(uspace_dst, src, size); |
123 | rc = memcpy_to_uspace(uspace_dst, src, size); |
124 | 124 | ||
125 | THREAD->in_copy_from_uspace = false; |
125 | THREAD->in_copy_from_uspace = false; |
126 | 126 | ||
127 | interrupts_restore(ipl); |
127 | interrupts_restore(ipl); |
128 | return !rc ? EPERM : 0; |
128 | return !rc ? EPERM : 0; |
129 | } |
129 | } |
130 | 130 | ||
131 | /** @} |
131 | /** @} |
132 | */ |
132 | */ |
133 | - | ||
134 | 133 |