1 files changed, 67 insertions, 0 deletions
diff --git a/crypto/openssh/openbsd-compat/xmmap.c b/crypto/openssh/openbsd-compat/xmmap.c
new file mode 100644
index 000000000000..8f1d2022cd4c
--- /dev/null
+++ b/crypto/openssh/openbsd-compat/xmmap.c
@@ -0,0 +1,67 @@
+/*
+ * 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 AUTHOR ``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 AUTHOR 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.
+ */
+
+#include "includes.h"
+
+#ifdef HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
+
+#include "log.h"
+
+void *xmmap(size_t size)
+{
+	void *address;
+
+#ifdef HAVE_MMAP
+# ifdef MAP_ANON
+	address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED,
+	    -1, 0);
+# else
+	address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
+	    open("/dev/zero", O_RDWR), 0);
+# endif
+
+#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX"
+	if (address == MAP_FAILED) {
+		char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
+		int tmpfd;
+
+		tmpfd = mkstemp(tmpname);
+		if (tmpfd == -1)
+			fatal("mkstemp(\"%s\"): %s",
+			    MM_SWAP_TEMPLATE, strerror(errno));
+		unlink(tmpname);
+		ftruncate(tmpfd, size);
+		address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
+		    tmpfd, 0);
+		close(tmpfd);
+	}
+
+	return (address);
+#else
+	fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
+	    __func__);
+#endif /* HAVE_MMAP */
+
+}
+