Bug 1286119 - Add CASES_FOR_fchown and use it. r=gcp

security/sandbox/linux/SandboxFilter.cpp

@@ -523,7 +523,7 @@ public:
     case __NR_utimes:
     case __NR_link:
     case __NR_unlink:
-    case __NR_fchown:
+    CASES_FOR_fchown:
     case __NR_fchmod:
 #endif
       return Allow();

security/sandbox/linux/SandboxFilterUtil.h

@@ -74,6 +74,12 @@ public:
 #define CASES_FOR_mmap   case __NR_mmap
 #endif
 
+#ifdef __NR_fchown32
+#define CASES_FOR_fchown   case __NR_fchown32: case __NR_fchown
+#else
+#define CASES_FOR_fchown   case __NR_fchown
+#endif
+
 #ifdef __NR_getuid32
 #define CASES_FOR_getuid   case __NR_getuid32
 #define CASES_FOR_getgid   case __NR_getgid32