Add information gathered through getauxval()

Suggested by Wladimir van der Laan.

Author: sipa

src/randomenv.cpp

@@ -22,6 +22,7 @@
 #ifdef WIN32
 #include <compat.h> // for Windows API
 #else
+#include <sys/auxv.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <sys/types.h>
@@ -213,6 +214,27 @@ void RandAddStaticEnv(CSHA512& hasher)
     hasher << x;
 #endif
 
+#ifndef WIN32
+    // Information available through getauxval()
+#  ifdef AT_HWCAP
+    hasher << getauxval(AT_HWCAP);
+#  endif
+#  ifdef AT_HWCAP2
+    hasher << getauxval(AT_HWCAP2);
+#  endif
+#  ifdef AT_RANDOM
+    hasher << getauxval(AT_RANDOM);
+#  endif
+#  ifdef AT_PLATFORM
+    const char* platform_str = (const char*)getauxval(AT_PLATFORM);
+    hasher.Write((const unsigned char*)platform_str, strlen(platform_str) + 1);
+#  endif
+#  ifdef AT_EXECFN
+    const char* exec_str = (const char*)getauxval(AT_EXECFN);
+    hasher.Write((const unsigned char*)exec_str, strlen(exec_str) + 1);
+#  endif
+#endif
+
 #ifdef HAVE_GETCPUID
     AddCPUID(hasher);
 #endif