Add hinting to improve ASLR for macos (all allocations) and linux (newly added allocation types).

src/platform-linux.cc

Index: src/platform-linux.cc
===================================================================
--- src/platform-linux.cc	(revision 9508)
+++ src/platform-linux.cc	(working copy)
@@ -456,7 +456,8 @@
   int size = ftell(file);
 
   void* memory =
-      mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0);
+      mmap(GetRandomMmapAddr(), size, PROT_READ | PROT_WRITE,

[Vyacheslav Egorov (Chromium), 2011/10/04 09:18:33]

preferred formatting is one arguments per line

[Cris Neckar, 2011/10/04 19:20:47]

Done.

+           MAP_SHARED, fileno(file), 0);
   return new PosixMemoryMappedFile(file, memory, size);
 }
 
@@ -471,7 +472,8 @@
     return NULL;
   }
   void* memory =
-      mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0);
+      mmap(GetRandomMmapAddr(), size, PROT_READ | PROT_WRITE,

[Vyacheslav Egorov (Chromium), 2011/10/04 09:18:33]

ditto

[Cris Neckar, 2011/10/04 19:20:47]

Done.

+           MAP_SHARED, fileno(file), 0);
   return new PosixMemoryMappedFile(file, memory, size);
 }
 
@@ -556,8 +558,8 @@
   // kernel log.
   int size = sysconf(_SC_PAGESIZE);
   FILE* f = fopen(kGCFakeMmap, "w+");
-  void* addr = mmap(NULL, size, PROT_READ | PROT_EXEC, MAP_PRIVATE,
-                    fileno(f), 0);
+  void* addr = mmap(GetRandomMmapAddr(), size, PROT_READ | PROT_EXEC,

[Vyacheslav Egorov (Chromium), 2011/10/04 09:18:33]

ditto

[Cris Neckar, 2011/10/04 19:20:47]

Done.

+                    MAP_PRIVATE, fileno(f), 0);
   ASSERT(addr != MAP_FAILED);
   OS::Free(addr, size);
   fclose(f);