1 files changed, 67 insertions, 0 deletions
diff --git a/lib/util/fchownat.c b/lib/util/fchownat.c
new file mode 100644
index 0000000..035f239
--- /dev/null
+++ b/lib/util/fchownat.c
@@ -0,0 +1,67 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2022 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_FCHOWNAT
+int
+sudo_fchownat(int dfd, const char *path, uid_t uid, gid_t gid, int flags)
+{
+    int odfd, ret;
+
+    if (dfd == AT_FDCWD) {
+	if (flags & AT_SYMLINK_NOFOLLOW)
+	    return lchown(path, uid, gid);
+	else
+	    return chown(path, uid, gid);
+    }
+
+    /* Save cwd */
+    if ((odfd = open(".", O_RDONLY)) == -1)
+	return -1;
+
+    if (fchdir(dfd) == -1) {
+	close(odfd);
+	return -1;
+    }
+
+    if (flags & AT_SYMLINK_NOFOLLOW)
+	ret = lchown(path, uid, gid);
+    else
+	ret = chown(path, uid, gid);
+
+    /* Restore cwd */
+    if (fchdir(odfd) == -1) {
+	/* Should not happen */
+	ret = -1;
+    }
+    close(odfd);
+
+    return ret;
+}
+#endif /* HAVE_FCHOWNAT */