128 lines
4.1 KiB
C
128 lines
4.1 KiB
C
/*
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* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "syscall_pub.h"
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int CheckRegion(const LosVmSpace *space, VADDR_T ptr, size_t len)
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{
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LosVmMapRegion *region = LOS_RegionFind((LosVmSpace *)space, ptr);
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if (region == NULL) {
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return -1;
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}
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if (ptr + len <= region->range.base + region->range.size) {
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return 0;
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}
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return CheckRegion(space, region->range.base + region->range.size,
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(ptr + len) - (region->range.base + region->range.size));
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}
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void *DupUserMem(const void *ptr, size_t len, int needCopy)
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{
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void *p = LOS_MemAlloc(OS_SYS_MEM_ADDR, len);
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if (p == NULL) {
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set_errno(ENOMEM);
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return NULL;
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}
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if (needCopy && LOS_ArchCopyFromUser(p, ptr, len) != 0) {
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LOS_MemFree(OS_SYS_MEM_ADDR, p);
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set_errno(EFAULT);
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return NULL;
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}
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return p;
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}
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int GetFullpath(int fd, const char *path, char **fullpath)
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{
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int ret = 0;
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char *pathRet = NULL;
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struct file *file = NULL;
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struct stat bufRet = {0};
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if (path != NULL) {
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ret = UserPathCopy(path, &pathRet);
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if (ret != 0) {
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goto OUT;
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}
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}
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if ((pathRet != NULL) && (*pathRet == '/')) {
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*fullpath = pathRet;
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pathRet = NULL;
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} else {
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if (fd != AT_FDCWD) {
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/* Process fd convert to system global fd */
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fd = GetAssociatedSystemFd(fd);
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}
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ret = fs_getfilep(fd, &file);
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if (file) {
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ret = stat(file->f_path, &bufRet);
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if (!ret) {
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if (!S_ISDIR(bufRet.st_mode)) {
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set_errno(ENOTDIR);
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ret = -ENOTDIR;
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goto OUT;
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}
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}
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}
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ret = vfs_normalize_pathat(fd, pathRet, fullpath);
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}
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OUT:
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PointerFree(pathRet);
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return ret;
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}
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int UserPathCopy(const char *userPath, char **pathBuf)
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{
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int ret;
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*pathBuf = (char *)LOS_MemAlloc(OS_SYS_MEM_ADDR, PATH_MAX + 1);
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if (*pathBuf == NULL) {
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return -ENOMEM;
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}
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ret = LOS_StrncpyFromUser(*pathBuf, userPath, PATH_MAX + 1);
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if (ret < 0) {
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(void)LOS_MemFree(OS_SYS_MEM_ADDR, *pathBuf);
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*pathBuf = NULL;
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return ret;
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} else if (ret > PATH_MAX) {
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(void)LOS_MemFree(OS_SYS_MEM_ADDR, *pathBuf);
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*pathBuf = NULL;
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return -ENAMETOOLONG;
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}
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(*pathBuf)[ret] = '\0';
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return 0;
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}
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