Index: lnt/trunk/lnt/testing/profile/perf.py
===================================================================
--- lnt/trunk/lnt/testing/profile/perf.py
+++ lnt/trunk/lnt/testing/profile/perf.py
@@ -18,7 +18,7 @@
 
     @staticmethod
     def checkFile(fn):
-        return open(fn).read(8) == 'PERFILE2'
+        return open(fn, 'rb').read(8) == b'PERFILE2'
 
     @staticmethod
     def deserialize(f, nm='nm', objdump='objdump', propagateExceptions=False):
Index: lnt/trunk/lnt/testing/profile/profilev1impl.py
===================================================================
--- lnt/trunk/lnt/testing/profile/profilev1impl.py
+++ lnt/trunk/lnt/testing/profile/profilev1impl.py
@@ -43,7 +43,7 @@
     @staticmethod
     def checkFile(fn):
         # "zlib compressed data" - 78 9C
-        return open(fn).read(2) == '\x78\x9c'
+        return open(fn, 'rb').read(2) == b'\x78\x9c'
 
     @staticmethod
     def deserialize(fobj):
Index: lnt/trunk/lnt/testing/profile/profilev2impl.py
===================================================================
--- lnt/trunk/lnt/testing/profile/profilev2impl.py
+++ lnt/trunk/lnt/testing/profile/profilev2impl.py
@@ -558,7 +558,7 @@
     def checkFile(fn):
         # The first number is the version (2); ULEB encoded this is simply
         # 0x02.
-        return ord(open(fn).read(1)) == 2
+        return open(fn, 'rb').read(1) == b'\x02'
 
     @staticmethod
     def deserialize(fobj):