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Rev 1702 Rev 1780
Line 92... Line 92...
92 
 * @param uspace_taskid_arg Userspace structure holding destination task ID.
 92 
 * @param uspace_taskid_arg Userspace structure holding destination task ID.
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 * @param caps Capabilities to grant.
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 * @param caps Capabilities to grant.
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 *
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 *
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 * @return Zero on success or an error code from @ref errno.h.
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 * @return Zero on success or an error code from @ref errno.h.
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 */
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 */
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__native sys_cap_grant(sysarg64_t *uspace_taskid_arg, cap_t caps)
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unative_t sys_cap_grant(sysarg64_t *uspace_taskid_arg, cap_t caps)
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{
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{
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    sysarg64_t taskid_arg;
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    sysarg64_t taskid_arg;
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    task_t *t;
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    task_t *t;
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    ipl_t ipl;
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    ipl_t ipl;
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    int rc;
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    int rc;
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    if (!(cap_get(TASK) & CAP_CAP))
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    if (!(cap_get(TASK) & CAP_CAP))
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        return (__native) EPERM;
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        return (unative_t) EPERM;
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    rc = copy_from_uspace(&taskid_arg, uspace_taskid_arg, sizeof(sysarg64_t));
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    rc = copy_from_uspace(&taskid_arg, uspace_taskid_arg, sizeof(sysarg64_t));
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    if (rc != 0)
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    if (rc != 0)
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        return (__native) rc;
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        return (unative_t) rc;
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    ipl = interrupts_disable();
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    ipl = interrupts_disable();
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    spinlock_lock(&tasks_lock);
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    spinlock_lock(&tasks_lock);
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    t = task_find_by_id((task_id_t) taskid_arg.value);
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    t = task_find_by_id((task_id_t) taskid_arg.value);
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    if (!t) {
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    if (!t) {
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        spinlock_unlock(&tasks_lock);
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        spinlock_unlock(&tasks_lock);
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        interrupts_restore(ipl);
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        interrupts_restore(ipl);
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        return (__native) ENOENT;
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        return (unative_t) ENOENT;
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    }
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    }
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    spinlock_lock(&t->lock);
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    spinlock_lock(&t->lock);
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    cap_set(t, cap_get(t) | caps);
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    cap_set(t, cap_get(t) | caps);
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    spinlock_unlock(&t->lock);
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    spinlock_unlock(&t->lock);
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 * @param uspace_taskid_arg Userspace structure holding destination task ID.
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 * @param uspace_taskid_arg Userspace structure holding destination task ID.
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 * @param caps Capabilities to revoke.
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 * @param caps Capabilities to revoke.
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 *
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 *
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 * @return Zero on success or an error code from @ref errno.h.
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 * @return Zero on success or an error code from @ref errno.h.
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 */
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 */
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__native sys_cap_revoke(sysarg64_t *uspace_taskid_arg, cap_t caps)
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unative_t sys_cap_revoke(sysarg64_t *uspace_taskid_arg, cap_t caps)
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{
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{
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    sysarg64_t taskid_arg;
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    sysarg64_t taskid_arg;
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    task_t *t;
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    task_t *t;
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    ipl_t ipl;
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    ipl_t ipl;
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    int rc;
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    int rc;
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    rc = copy_from_uspace(&taskid_arg, uspace_taskid_arg, sizeof(sysarg64_t));
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    rc = copy_from_uspace(&taskid_arg, uspace_taskid_arg, sizeof(sysarg64_t));
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    if (rc != 0)
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    if (rc != 0)
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        return (__native) rc;
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        return (unative_t) rc;
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    ipl = interrupts_disable();
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    ipl = interrupts_disable();
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    spinlock_lock(&tasks_lock);
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    spinlock_lock(&tasks_lock);
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    t = task_find_by_id((task_id_t) taskid_arg.value);
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    t = task_find_by_id((task_id_t) taskid_arg.value);
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    if (!t) {
 156 
    if (!t) {
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        spinlock_unlock(&tasks_lock);
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        spinlock_unlock(&tasks_lock);
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        interrupts_restore(ipl);
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        interrupts_restore(ipl);
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        return (__native) ENOENT;
 159 
        return (unative_t) ENOENT;
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    }
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    }
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 161 
 
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    /*
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    /*
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     * Revoking capabilities is different from granting them in that
 163 
     * Revoking capabilities is different from granting them in that
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     * a task can revoke capabilities from itself even if it
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     * a task can revoke capabilities from itself even if it
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     * doesn't have CAP_CAP.
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     * doesn't have CAP_CAP.
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     */
 166 
     */
167 
    if (!(cap_get(TASK) & CAP_CAP) || !(t == TASK)) {
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    if (!(cap_get(TASK) & CAP_CAP) || !(t == TASK)) {
168 
        spinlock_unlock(&tasks_lock);
 168 
        spinlock_unlock(&tasks_lock);
169 
        interrupts_restore(ipl);
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        interrupts_restore(ipl);
170 
        return (__native) EPERM;
 170 
        return (unative_t) EPERM;
171 
    }
 171 
    }
172 
   
 172 
   
173 
    spinlock_lock(&t->lock);
 173 
    spinlock_lock(&t->lock);
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    cap_set(t, cap_get(t) & ~caps);
 174 
    cap_set(t, cap_get(t) & ~caps);
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    spinlock_unlock(&t->lock);
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    spinlock_unlock(&t->lock);