syscall_pub.c

/*
 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 *    conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 COPYRIGHT HOLDER OR
 * CONTRIBUTORS 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.
 */
#include "syscall_pub.h"

int CheckRegion(const LosVmSpace *space, VADDR_T ptr, size_t len)
{
    LosVmMapRegion *region = LOS_RegionFind((LosVmSpace *)space, ptr);
    if (region == NULL) {
        return -1;
    }
    if (ptr + len <= region->range.base + region->range.size) {
        return 0;
    }
    return CheckRegion(space, region->range.base + region->range.size,
                       (ptr + len) - (region->range.base + region->range.size));
}

void *DupUserMem(const void *ptr, size_t len, int needCopy)
{
    void *p = LOS_MemAlloc(OS_SYS_MEM_ADDR, len);

    if (p == NULL) {
        set_errno(ENOMEM);
        return NULL;
    }

    if (needCopy && LOS_ArchCopyFromUser(p, ptr, len) != 0) {
        LOS_MemFree(OS_SYS_MEM_ADDR, p);
        set_errno(EFAULT);
        return NULL;
    }

    return p;
}