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-rw-r--r--lib/util/openat.c63
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diff --git a/lib/util/openat.c b/lib/util/openat.c
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+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2015, 2019-2020 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "sudo_compat.h"
+
+#ifndef HAVE_OPENAT
+int
+sudo_openat(int dfd, const char *path, int flags, mode_t mode)
+{
+ int fd, odfd;
+
+ if (dfd == AT_FDCWD)
+ return open(path, flags, mode);
+
+ /* Save cwd */
+ if ((odfd = open(".", O_RDONLY)) == -1)
+ return -1;
+
+ if (fchdir(dfd) == -1) {
+ close(odfd);
+ return -1;
+ }
+
+ fd = open(path, flags, mode);
+
+ /* Restore cwd */
+ if (fchdir(odfd) == -1) {
+ /* Should not happen */
+ if (fd != -1) {
+ close(fd);
+ fd = -1;
+ }
+ }
+ close(odfd);
+
+ return fd;
+}
+#endif /* HAVE_OPENAT */