1 files changed, 13 insertions, 1 deletions
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index 956f66ab4a..94d81b9ec0 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -361,7 +361,19 @@ static void *do_touch_pages(void *arg)
         memset_thread_failed = true;
     } else {
         for (i = 0; i < numpages; i++) {
-            memset(addr, 0, 1);
+            /*
+             * Read & write back the same value, so we don't
+             * corrupt existing user/app data that might be
+             * stored.
+             *
+             * 'volatile' to stop compiler optimizing this away
+             * to a no-op
+             *
+             * TODO: get a better solution from kernel so we
+             * don't need to write at all so we don't cause
+             * wear on the storage backing the region...
+             */
+            *(volatile char *)addr = *addr;
             addr += hpagesize;
         }
     }