Seperate arc4random's os-dependent parts into static inline functions,

making it much easier for libressl -portable to fill in the gaps.
ok bcook beck

1 files changed, 66 insertions, 0 deletions

diff --git a/src/lib/libcrypto/crypto/arc4random_linux.h b/src/lib/libcrypto/crypto/arc4random_linux.h
new file mode 100644
index 0000000000..2319ccbf42
--- /dev/null
+++ b/src/lib/libcrypto/crypto/arc4random_linux.h
@@ -0,0 +1,66 @@
+/*      $OpenBSD: arc4random_linux.h,v 1.1 2014/07/18 02:05:55 deraadt Exp $    */
+
+/*
+ * Copyright (c) 1996, David Mazieres <dm@uun.org>
+ * Copyright (c) 2008, Damien Miller <djm@openbsd.org>
+ * Copyright (c) 2013, Markus Friedl <markus@openbsd.org>
+ *
+ * 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.
+ */
+
+/*
+ * Stub functions for portability.
+ */
+
+static inline void *
+_rs_allocate(size_t len)
+{
+        void *p;
+
+        if ((p = mmap(NULL, sizeof(*rs), PROT_READ|PROT_WRITE,
+            MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED)
+                return (NULL);
+        return (p);
+}
+
+static inline void
+_rs_forkhandler(void)
+{
+        /*
+         * Race-free because we're running single-threaded in a new
+         * address space, and once allocated rs is never deallocated.
+         */
+        if (rs)
+                rs->rs_count = 0;
+}
+
+static inline void
+_rs_forkdetect(void)
+{
+        static pid_t _rs_pid = 0;
+        pid_t pid = getpid();
+
+        /* If a system lacks MAP_INHERIT_ZERO, resort to getpid() */
+        if (_rs_pid == 0 || _rs_pid != pid) {
+                _rs_pid = pid;
+                if (rs)
+                        rs->rs_count = 0;
+        }
+}
+
+static inline void
+_rs_forkdetectsetup(struct _rs *rs, size_t len)
+{
+        _ARC4_ATFORK(_rs_forkhandler);
+}
+