(bal/tim) [acconfig.h configure.ac monitor_mm.c servconf.c

  openbsd-compat/Makefile.in] support compression on platforms that
  have no/broken MAP_ANON. Moved code to openbsd-compat/xmmap.c
  Based on patch from nalin@redhat.com of code extracted from Owl's package

1 files changed, 65 insertions, 0 deletions

diff --git a/openbsd-compat/xmmap.c b/openbsd-compat/xmmap.c
new file mode 100644
index 000000000..a6b7d3bdf
--- /dev/null
+++ b/openbsd-compat/xmmap.c
@@ -0,0 +1,65 @@
+/*
+ * 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
+
+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 */
+
+}
+