A mechanism to identify/forbid/"rewrite" non-temporal instructions (and other)

src/trusted/service_runtime/sys_memory.c

Index: src/trusted/service_runtime/sys_memory.c
diff --git a/src/trusted/service_runtime/sys_memory.c b/src/trusted/service_runtime/sys_memory.c
index 46767b9a89120d37510728da3092e1108ac730ea..7b0d7033d81a0b7192236b7dc312bb997d656b7a 100644
--- a/src/trusted/service_runtime/sys_memory.c
+++ b/src/trusted/service_runtime/sys_memory.c
@@ -267,6 +267,7 @@ int32_t NaClSysMmapIntern(struct NaClApp        *nap,
   nacl_off64_t                file_bytes;
   nacl_off64_t                host_rounded_file_bytes;
   size_t                      alloc_rounded_file_bytes;
+  uint32_t                    val_flags;
 
   holding_app_lock = 0;
   ndp = NULL;
@@ -721,6 +722,7 @@ int32_t NaClSysMmapIntern(struct NaClApp        *nap,
         goto cleanup;
       }
 
+      val_flags = nap->pnacl_mode ? DISABLE_NONTEMPORALS : 0;
       /* Ask validator / validation cache */
       NaClMetadataFromNaClDescCtor(&metadata, ndp);
       validator_status = NACL_FI("MMAP_FORCE_MMAP_VALIDATION_FAIL",
@@ -729,6 +731,7 @@ int32_t NaClSysMmapIntern(struct NaClApp        *nap,
                                             (uint8_t *) image_sys_addr,
                                             length,
                                             0,  /* stubout_mode: no */
+                                            val_flags,
                                             1,  /* readonly_text: yes */
                                             nap->cpu_features,
                                             &metadata,