Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 41 insertions, 0 deletions

diff --git a/tests/qtest/fuzz/fork_fuzz.c b/tests/qtest/fuzz/fork_fuzz.c
new file mode 100644
index 000000000..6ffb2a793
--- /dev/null
+++ b/tests/qtest/fuzz/fork_fuzz.c
@@ -0,0 +1,41 @@
+/*
+ * Fork-based fuzzing helpers
+ *
+ * Copyright Red Hat Inc., 2019
+ *
+ * Authors:
+ *  Alexander Bulekov   <alxndr@bu.edu>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "fork_fuzz.h"
+
+
+void counter_shm_init(void)
+{
+    /* Copy what's in the counter region to a temporary buffer.. */
+    void *copy = malloc(&__FUZZ_COUNTERS_END - &__FUZZ_COUNTERS_START);
+    memcpy(copy,
+           &__FUZZ_COUNTERS_START,
+           &__FUZZ_COUNTERS_END - &__FUZZ_COUNTERS_START);
+
+    /* Map a shared region over the counter region */
+    if (mmap(&__FUZZ_COUNTERS_START,
+             &__FUZZ_COUNTERS_END - &__FUZZ_COUNTERS_START,
+             PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED | MAP_ANONYMOUS,
+             0, 0) == MAP_FAILED) {
+        perror("Error: ");
+        exit(1);
+    }
+
+    /* Copy the original data back to the counter-region */
+    memcpy(&__FUZZ_COUNTERS_START, copy,
+           &__FUZZ_COUNTERS_END - &__FUZZ_COUNTERS_START);
+    free(copy);
+}
+
+