1 files changed, 81 insertions, 0 deletions
diff --git a/lib/libc/posix1e/cap_copy.c b/lib/libc/posix1e/cap_copy.c
new file mode 100644
index 0000000..fdfd73e
--- /dev/null
+++ b/lib/libc/posix1e/cap_copy.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2001 by Thomas Moestl.  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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 REGENTS 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.
+ */
+/*
+ * TrustedBSD implementation of cap_copy_ext()/cap_copy_int()
+ *
+ * These are largely nops currently, because our internal format is contiguous.
+ * We just copy our representation out, and do some minumum validations on
+ * external data.
+ *
+ * XXX: we cannot detect cap being invalid. If it is, the program will probably
+ * segfault.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/capability.h>
+
+#include <errno.h>
+#include <stdlib.h>
+
+ssize_t
+cap_copy_ext(void *ext_p, cap_t cap, ssize_t size)
+{
+	if (size < 0) {
+		errno = EINVAL;
+		return (-1);
+	}
+	if (size < sizeof(struct cap)) {
+		errno = ERANGE;
+		return (-1);
+	}
+	memcpy(ext_p, cap, sizeof(struct cap));
+	return (sizeof(struct cap));
+}
+
+cap_t
+cap_copy_int(const void *ext_p)
+{
+	cap_t c;
+	/* We can use cap_dup here, because the format is the same */
+	if ((c = cap_dup((cap_t)ext_p)) == NULL)
+		return ((cap_t)NULL);
+	/* Basic validation */
+	if ((c->c_effective & ~CAP_ALL_ON) || (c->c_permitted & ~CAP_ALL_ON) ||
+	    (c->c_inheritable & ~CAP_ALL_ON)) {
+		cap_free(c);
+		errno = EINVAL;
+		return ((cap_t)NULL);
+	}
+	return (c);
+}
+	    
+ssize_t
+cap_size(cap_t cap)
+{
+	(void)cap; /* silence warning */
+	return (sizeof(struct cap));
+}