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-rw-r--r--src/journal/mmap-cache.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/src/journal/mmap-cache.c b/src/journal/mmap-cache.c
index b7db6f1da5..c57c1623c5 100644
--- a/src/journal/mmap-cache.c
+++ b/src/journal/mmap-cache.c
@@ -83,7 +83,13 @@ struct MMapCache {
};
#define WINDOWS_MIN 64
-#define WINDOW_SIZE (8ULL*1024ULL*1024ULL)
+
+#ifdef ENABLE_DEBUG_MMAP_CACHE
+/* Tiny windows increase mmap activity and the chance of exposing unsafe use. */
+# define WINDOW_SIZE (page_size())
+#else
+# define WINDOW_SIZE (8ULL*1024ULL*1024ULL)
+#endif
MMapCache* mmap_cache_new(void) {
MMapCache *m;
@@ -187,11 +193,17 @@ static void context_detach_window(Context *c) {
if (!w->contexts && w->keep_always == 0) {
/* Not used anymore? */
+#ifdef ENABLE_DEBUG_MMAP_CACHE
+ /* Unmap unused windows immediately to expose use-after-unmap
+ * by SIGSEGV. */
+ window_free(w);
+#else
LIST_PREPEND(unused, c->cache->unused, w);
if (!c->cache->last_unused)
c->cache->last_unused = w;
w->in_unused = true;
+#endif
}
}