[Fuzzing] Adding all-clusters-app fuzz test to OSS-Fuzz (project-chip#35408)

* Added a base38 rountrip Fuzzer to fuzz the encoding and decoding in base38
Added a base38 decoder Fuzzer to fuzz the function decoding base38 strings
Added a dependancy in TLV-Reader config to correct the build error

* adding all clusters

* Restyled by gn

* Moving this back

* Restyled by gn

* Update src/setup_payload/tests/FuzzBase38.cpp

Co-authored-by: Boris Zbarsky <bzbarsky@apple.com>

* Update src/setup_payload/tests/FuzzBase38.cpp

Co-authored-by: Boris Zbarsky <bzbarsky@apple.com>

* Update src/setup_payload/tests/FuzzBase38.cpp

Co-authored-by: Boris Zbarsky <bzbarsky@apple.com>

* Removing this

* Updating

* Update src/setup_payload/tests/FuzzBase38Decode.cpp

Co-authored-by: Boris Zbarsky <bzbarsky@apple.com>

* restrict activation of enable_fuzz_test_targets

---------

Co-authored-by: Justin Wood <woody@apple.com>
Co-authored-by: Restyled.io <commits@restyled.io>
Co-authored-by: Boris Zbarsky <bzbarsky@apple.com>

Author: 4 people

BUILD.gn

@@ -52,6 +52,7 @@ if (current_toolchain != "${dir_pw_toolchain}/default:default") {
   if (enable_fuzz_test_targets) {
     group("fuzz_tests") {
       deps = [
+        "${chip_root}/examples/all-clusters-app/linux:fuzz-chip-all-clusters-app",
         "${chip_root}/src/credentials/tests:fuzz-chip-cert",
         "${chip_root}/src/lib/core/tests:fuzz-tlv-reader",
         "${chip_root}/src/lib/dnssd/minimal_mdns/tests:fuzz-minmdns-packet-parsing",

build/chip/fuzz_test.gni

@@ -21,9 +21,12 @@ import("${chip_root}/build/chip/tests.gni")
 import("${dir_pw_unit_test}/test.gni")
 
 declare_args() {
-  enable_fuzz_test_targets = is_clang && chip_build_tests &&
-                             (current_os == "linux" || current_os == "mac")
+  #Fuzz testing using libfuzzer
+  enable_fuzz_test_targets =
+      (is_libfuzzer || oss_fuzz) && is_clang && chip_build_tests &&
+      (current_os == "linux" || current_os == "mac")
 
+  #Fuzz testing using pw_fuzzer and FuzzTest Framework
   pw_enable_fuzz_test_targets = false
 }
 

examples/all-clusters-app/linux/BUILD.gn

@@ -19,6 +19,7 @@ import("${build_root}/config/compiler/compiler.gni")
 import("${chip_root}/src/lib/lib.gni")
 import("${chip_root}/src/platform/device.gni")
 
+import("${chip_root}/build/chip/fuzz_test.gni")
 import("${chip_root}/examples/common/pigweed/pigweed_rpcs.gni")
 
 if (chip_enable_pw_rpc) {
@@ -201,3 +202,13 @@ group("linux") {
 group("default") {
   deps = [ ":linux" ]
 }
+
+if (enable_fuzz_test_targets) {
+  chip_fuzz_target("fuzz-chip-all-clusters-app") {
+    sources = [ "fuzzing-main.cpp" ]
+    public_deps = [
+      ":chip-all-clusters-common",
+      "${chip_root}/examples/platform/linux:app-main",
+    ]
+  }
+}