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| Rev | Author | Line No. | Line |
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| 1174 | jermar | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2006 Jakub Jermar |
| 1174 | jermar | 3 | * All rights reserved. |
| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 1888 | jermar | 29 | /** @addtogroup generic |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | |||
| 1264 | jermar | 33 | /** |
| 34 | * @file cap.c |
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| 35 | * @brief Capabilities control. |
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| 36 | * |
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| 37 | * @see cap.h |
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| 38 | */ |
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| 39 | |||
| 1174 | jermar | 40 | #include <security/cap.h> |
| 41 | #include <proc/task.h> |
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| 42 | #include <synch/spinlock.h> |
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| 1297 | jermar | 43 | #include <syscall/sysarg64.h> |
| 44 | #include <syscall/copy.h> |
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| 1174 | jermar | 45 | #include <arch.h> |
| 3862 | rimsky | 46 | #include <arch/asm.h> |
| 1297 | jermar | 47 | #include <errno.h> |
| 1174 | jermar | 48 | |
| 49 | /** Set capabilities. |
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| 50 | * |
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| 51 | * @param t Task whose capabilities are to be changed. |
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| 52 | * @param caps New set of capabilities. |
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| 53 | */ |
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| 54 | void cap_set(task_t *t, cap_t caps) |
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| 55 | { |
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| 56 | ipl_t ipl; |
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| 57 | |||
| 58 | ipl = interrupts_disable(); |
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| 59 | spinlock_lock(&t->lock); |
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| 60 | |||
| 61 | t->capabilities = caps; |
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| 62 | |||
| 63 | spinlock_unlock(&t->lock); |
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| 64 | interrupts_restore(ipl); |
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| 65 | } |
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| 66 | |||
| 67 | /** Get capabilities. |
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| 68 | * |
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| 69 | * @param t Task whose capabilities are to be returned. |
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| 70 | * @return Task's capabilities. |
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| 71 | */ |
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| 72 | cap_t cap_get(task_t *t) |
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| 73 | { |
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| 74 | ipl_t ipl; |
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| 75 | cap_t caps; |
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| 76 | |||
| 77 | ipl = interrupts_disable(); |
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| 78 | spinlock_lock(&t->lock); |
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| 79 | |||
| 80 | caps = t->capabilities; |
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| 81 | |||
| 82 | spinlock_unlock(&t->lock); |
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| 83 | interrupts_restore(ipl); |
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| 84 | |||
| 85 | return caps; |
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| 86 | } |
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| 1297 | jermar | 87 | |
| 88 | /** Grant capabilities to a task. |
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| 89 | * |
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| 90 | * The calling task must have the CAP_CAP capability. |
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| 91 | * |
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| 92 | * @param uspace_taskid_arg Userspace structure holding destination task ID. |
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| 93 | * @param caps Capabilities to grant. |
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| 94 | * |
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| 95 | * @return Zero on success or an error code from @ref errno.h. |
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| 96 | */ |
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| 1780 | jermar | 97 | unative_t sys_cap_grant(sysarg64_t *uspace_taskid_arg, cap_t caps) |
| 1297 | jermar | 98 | { |
| 99 | sysarg64_t taskid_arg; |
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| 100 | task_t *t; |
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| 101 | ipl_t ipl; |
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| 102 | int rc; |
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| 103 | |||
| 104 | if (!(cap_get(TASK) & CAP_CAP)) |
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| 1780 | jermar | 105 | return (unative_t) EPERM; |
| 1297 | jermar | 106 | |
| 107 | rc = copy_from_uspace(&taskid_arg, uspace_taskid_arg, sizeof(sysarg64_t)); |
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| 108 | if (rc != 0) |
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| 1780 | jermar | 109 | return (unative_t) rc; |
| 1297 | jermar | 110 | |
| 111 | ipl = interrupts_disable(); |
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| 112 | spinlock_lock(&tasks_lock); |
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| 113 | t = task_find_by_id((task_id_t) taskid_arg.value); |
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| 1839 | decky | 114 | if ((!t) || (!context_check(CONTEXT, t->context))) { |
| 1297 | jermar | 115 | spinlock_unlock(&tasks_lock); |
| 116 | interrupts_restore(ipl); |
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| 1780 | jermar | 117 | return (unative_t) ENOENT; |
| 1297 | jermar | 118 | } |
| 119 | |||
| 1588 | jermar | 120 | spinlock_lock(&t->lock); |
| 1297 | jermar | 121 | cap_set(t, cap_get(t) | caps); |
| 1588 | jermar | 122 | spinlock_unlock(&t->lock); |
| 1297 | jermar | 123 | |
| 1588 | jermar | 124 | spinlock_unlock(&tasks_lock); |
| 1297 | jermar | 125 | interrupts_restore(ipl); |
| 126 | return 0; |
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| 127 | } |
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| 128 | |||
| 129 | /** Revoke capabilities from a task. |
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| 130 | * |
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| 131 | * The calling task must have the CAP_CAP capability or the caller must |
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| 132 | * attempt to revoke capabilities from itself. |
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| 133 | * |
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| 134 | * @param uspace_taskid_arg Userspace structure holding destination task ID. |
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| 135 | * @param caps Capabilities to revoke. |
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| 136 | * |
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| 137 | * @return Zero on success or an error code from @ref errno.h. |
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| 138 | */ |
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| 1780 | jermar | 139 | unative_t sys_cap_revoke(sysarg64_t *uspace_taskid_arg, cap_t caps) |
| 1297 | jermar | 140 | { |
| 141 | sysarg64_t taskid_arg; |
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| 142 | task_t *t; |
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| 143 | ipl_t ipl; |
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| 144 | int rc; |
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| 145 | |||
| 146 | rc = copy_from_uspace(&taskid_arg, uspace_taskid_arg, sizeof(sysarg64_t)); |
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| 147 | if (rc != 0) |
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| 1780 | jermar | 148 | return (unative_t) rc; |
| 1297 | jermar | 149 | |
| 150 | ipl = interrupts_disable(); |
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| 151 | spinlock_lock(&tasks_lock); |
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| 152 | t = task_find_by_id((task_id_t) taskid_arg.value); |
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| 1839 | decky | 153 | if ((!t) || (!context_check(CONTEXT, t->context))) { |
| 1297 | jermar | 154 | spinlock_unlock(&tasks_lock); |
| 155 | interrupts_restore(ipl); |
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| 1780 | jermar | 156 | return (unative_t) ENOENT; |
| 1297 | jermar | 157 | } |
| 158 | |||
| 159 | /* |
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| 160 | * Revoking capabilities is different from granting them in that |
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| 161 | * a task can revoke capabilities from itself even if it |
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| 162 | * doesn't have CAP_CAP. |
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| 163 | */ |
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| 164 | if (!(cap_get(TASK) & CAP_CAP) || !(t == TASK)) { |
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| 1588 | jermar | 165 | spinlock_unlock(&tasks_lock); |
| 1297 | jermar | 166 | interrupts_restore(ipl); |
| 1780 | jermar | 167 | return (unative_t) EPERM; |
| 1297 | jermar | 168 | } |
| 1588 | jermar | 169 | |
| 170 | spinlock_lock(&t->lock); |
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| 171 | cap_set(t, cap_get(t) & ~caps); |
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| 172 | spinlock_unlock(&t->lock); |
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| 1297 | jermar | 173 | |
| 1588 | jermar | 174 | spinlock_unlock(&tasks_lock); |
| 175 | |||
| 1297 | jermar | 176 | interrupts_restore(ipl); |
| 177 | return 0; |
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| 178 | } |
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| 1702 | cejka | 179 | |
| 1888 | jermar | 180 | /** @} |
| 1702 | cejka | 181 | */ |
| 182 |