1 files changed, 55 insertions, 0 deletions
diff --git a/tests/qtest/fuzz/fork_fuzz.c b/tests/qtest/fuzz/fork_fuzz.c
new file mode 100644
index 0000000000..2bd0851903
--- /dev/null
+++ b/tests/qtest/fuzz/fork_fuzz.c
@@ -0,0 +1,55 @@
+/*
+ * 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)
+{
+    char *shm_path = g_strdup_printf("/qemu-fuzz-cntrs.%d", getpid());
+    int fd = shm_open(shm_path, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
+    g_free(shm_path);
+
+    if (fd == -1) {
+        perror("Error: ");
+        exit(1);
+    }
+    if (ftruncate(fd, &__FUZZ_COUNTERS_END - &__FUZZ_COUNTERS_START) == -1) {
+        perror("Error: ");
+        exit(1);
+    }
+    /* Copy what's in the counter region to the shm.. */
+    void *rptr = mmap(NULL ,
+            &__FUZZ_COUNTERS_END - &__FUZZ_COUNTERS_START,
+            PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+    memcpy(rptr,
+           &__FUZZ_COUNTERS_START,
+           &__FUZZ_COUNTERS_END - &__FUZZ_COUNTERS_START);
+
+    munmap(rptr, &__FUZZ_COUNTERS_END - &__FUZZ_COUNTERS_START);
+
+    /* And map the shm over the counter region */
+    rptr = mmap(&__FUZZ_COUNTERS_START,
+            &__FUZZ_COUNTERS_END - &__FUZZ_COUNTERS_START,
+            PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, fd, 0);
+
+    close(fd);
+
+    if (!rptr) {
+        perror("Error: ");
+        exit(1);
+    }
+}
+
+