Migrate aslr test to gtest.

Create tests which test the values of mmap_rnd_bits, and
mmap_rnd_compat_bits, if applicable, and verify that the address space
is randomized as expected given the provided values.

Also add a pair of tests to CTS that enforce that the observed entropy
is at least as high as a designated value.  That value will start as our
default value, which also corresponds to the maximum value of some
configurations.

Packaging of executables along with a nativetest suite is not supported,
so add a dummy nativetest suite, scrape_mmap_addr, which ensure that the
executables are present along with the given tests at predictable
locations.

Bug: 26512380
Change-Id: Ib1202984f9b98c503b8d3bc2c2248a9d06940845

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/kernel.config/scrape_mmap_addr.cpp b/tests/kernel.config/scrape_mmap_addr.cpp
new file mode 100644
index 00000000..be5995f1
--- /dev/null
+++ b/tests/kernel.config/scrape_mmap_addr.cpp
@@ -0,0 +1,32 @@
+#include <errno.h>
+#include <fstream>
+#include <iostream>
+#include <regex>
+#include <string>
+#include <string.h>
+
+int main(int argc, char * argv[]) {
+    if (argc != 2) {
+        std::cerr << "usage: " << argv[0] << ": libname\n";
+        return -1;
+    }
+    std::regex reg(std::string("^([a-f0-9]+)\\-[0-9a-f]+\\s+.+\\s+(\\d+)\\s+.+\\s+\\d+\\s+") + std::string(argv[1]) + std::string("\\s*$"));
+
+    /* open /proc/self/maps */
+    std::string ln;
+    std::ifstream m_file("/proc/self/maps");
+    if (!m_file) {
+        std::cerr << "Unable to open /proc/self/maps " << strerror(errno) << "\n";
+        return -1;
+    }
+    while (getline(m_file, ln)) {
+        std::smatch sm;
+        if (std::regex_match (ln,sm, reg)) {
+            if (std::stoi(sm[2]) == 0) {
+                std::cout << sm[1];
+                return 0;
+            }
+        }
+    }
+    return -1;
+}