[linux] Add libfuzzer targets

2017-06-19 19:09:15 -07:00
parent a48e129d48
commit e7093ca18c
3 changed files with 260 additions and 0 deletions
@@ -0,0 +1,85 @@
+/**
+ * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+/*
+  This program takes a file in input,
+  performs a zstd round-trip test (compression - decompress)
+  compares the result with original
+  and generates a crash (double free) on corruption detection.
+*/
+
+/*===========================================
+*   Dependencies
+*==========================================*/
+#include <stddef.h>     /* size_t */
+#include <stdlib.h>     /* malloc, free, exit */
+#include <stdio.h>      /* fprintf */
+#include <linux/zstd.h>
+
+/*===========================================
+*   Macros
+*==========================================*/
+#define MIN(a,b)  ( (a) < (b) ? (a) : (b) )
+
+static ZSTD_DCtx *dctx = NULL;
+void *dws = NULL;
+static void* rBuff = NULL;
+static size_t buffSize = 0;
+
+static void crash(int errorCode){
+    /* abort if AFL/libfuzzer, exit otherwise */
+    #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION /* could also use __AFL_COMPILER */
+        abort();
+    #else
+        exit(errorCode);
+    #endif
+}
+
+static void decompressCheck(const void* srcBuff, size_t srcBuffSize)
+{
+    size_t const neededBuffSize = 20 * srcBuffSize;
+
+    /* Allocate all buffers and contexts if not already allocated */
+    if (neededBuffSize > buffSize) {
+        free(rBuff);
+        buffSize = 0;
+
+        rBuff = malloc(neededBuffSize);
+        if (!rBuff) {
+            fprintf(stderr, "not enough memory ! \n");
+            crash(1);
+        }
+        buffSize = neededBuffSize;
+    }
+    if (!dctx) {
+        size_t const workspaceSize = ZSTD_DCtxWorkspaceBound();
+        dws = malloc(workspaceSize);
+        if (!dws) {
+            fprintf(stderr, "not enough memory ! \n");
+            crash(1);
+        }
+        dctx = ZSTD_initDCtx(dws, workspaceSize);
+        if (!dctx) {
+            fprintf(stderr, "not enough memory ! \n");
+            crash(1);
+        }
+    }
+    ZSTD_decompressDCtx(dctx, rBuff, buffSize, srcBuff, srcBuffSize);
+
+#ifndef SKIP_FREE
+    free(dws); dws = NULL; dctx = NULL;
+    free(rBuff); rBuff = NULL;
+    buffSize = 0;
+#endif
+}
+
+int LLVMFuzzerTestOneInput(const unsigned char *srcBuff, size_t srcBuffSize) {
+  decompressCheck(srcBuff, srcBuffSize);
+  return 0;
+}