frida mode android build fix proposal.

also protecting seccomp the other way around in case it is ported
 in another platform supported by frida.

11 files changed, 50 insertions, 8 deletions

diff --git a/frida_mode/GNUmakefile b/frida_mode/GNUmakefile
index 4d6d7147..ed35c9f6 100644
--- a/frida_mode/GNUmakefile
+++ b/frida_mode/GNUmakefile
@@ -80,6 +80,22 @@ ifeq "$(shell uname)" "Linux"
  OS:=linux
 endif
 
+ifneq "$(findstring android, $(shell $(CC) --version 2>/dev/null))" ""
+ OS:=android
+ ifneq "$(findstring aarch64, $(shell $(CC) --version 2>/dev/null))" ""
+   ARCH:=arm64
+ endif
+ ifneq "$(findstring arm, $(shell $(CC) --version 2>/dev/null))" ""
+   ARCH:=arm
+ endif
+ ifneq "$(findstring x86_64, $(shell $(CC) --version 2>/dev/null))" ""
+   ARCH:=x86_64
+ endif
+ ifneq "$(findstring i686, $(shell $(CC) --version 2>/dev/null))" ""
+   ARCH:=x86
+ endif
+endif
+
 ifndef OS
  $(error "Operating system unsupported")
 endif
diff --git a/frida_mode/README.md b/frida_mode/README.md
index 165f8089..df40c771 100644
--- a/frida_mode/README.md
+++ b/frida_mode/README.md
@@ -55,6 +55,20 @@ tests in 32-bit mode, run `make ARCH=x86 frida`. When switching between
 architectures it may be necessary to run `make clean` first for a given build
 target to remove previously generated binaries for a different architecture.
 
+### Android
+
+In order to build, you need to download the Android SDK.
+
+```
+https://developer.android.com/ndk/downloads
+```
+
+Then creating locally a standalone chain as follow.
+
+```
+https://developer.android.com/ndk/guides/standalone_toolchain
+```
+
 ## Usage
 
 FRIDA mode added some small modifications to `afl-fuzz` and similar tools
diff --git a/frida_mode/src/instrument/instrument_x64.c b/frida_mode/src/instrument/instrument_x64.c
index ebdf1440..a7eb650a 100644
--- a/frida_mode/src/instrument/instrument_x64.c
+++ b/frida_mode/src/instrument/instrument_x64.c
@@ -4,8 +4,12 @@
 #include <sys/shm.h>
 
 #if defined(__linux__)
+#if !defined(__ANDROID__)
 #include <asm/prctl.h>
 #include <sys/syscall.h>
+#else
+#include <linux/ashmem.h>
+#endif
 #endif
 
 #include "frida-gumjs.h"
@@ -156,8 +160,16 @@ static void instrument_coverage_optimize_map_mmap(char *   shm_file_path,
 
   __afl_area_ptr = NULL;
 
+#if !defined(__ANDROID__)
   shm_fd = shm_open(shm_file_path, O_RDWR, DEFAULT_PERMISSION);
   if (shm_fd == -1) { FATAL("shm_open() failed\n"); }
+#else
+  shm_fd = open("/dev/ashmem", O_RDWR);
+  if (shm_fd == -1) { FATAL("open() failed\n"); }
+  if (ioctl(shm_fd, ASHMEM_SET_NAME, shm_file_path) == -1) { FATAL("ioctl(ASHMEM_SET_NAME) failed"); }
+  if (ioctl(shm_fd, ASHMEM_SET_SIZE, __afl_map_size) == -1) { FATAL("ioctl(ASHMEM_SET_SIZE) failed"); }
+
+#endif
 
   __afl_area_ptr = mmap(address, __afl_map_size, PROT_READ | PROT_WRITE,
                         MAP_FIXED_NOREPLACE | MAP_SHARED, shm_fd, 0);
diff --git a/frida_mode/src/seccomp/seccomp_atomic.c b/frida_mode/src/seccomp/seccomp_atomic.c
index 5097511a..c2042f97 100644
--- a/frida_mode/src/seccomp/seccomp_atomic.c
+++ b/frida_mode/src/seccomp/seccomp_atomic.c
@@ -1,4 +1,4 @@
-#ifndef __APPLE__
+#if defined(__linux__) && !defined(__ANDROID__)
 
   #include <stdbool.h>
   #include <stdio.h>
diff --git a/frida_mode/src/seccomp/seccomp_callback.c b/frida_mode/src/seccomp/seccomp_callback.c
index 7e1e2070..a88196ac 100644
--- a/frida_mode/src/seccomp/seccomp_callback.c
+++ b/frida_mode/src/seccomp/seccomp_callback.c
@@ -1,4 +1,4 @@
-#ifndef __APPLE__
+#if defined(__linux__) && !defined(__ANDROID__)
 
   #include <execinfo.h>
   #include <fcntl.h>
diff --git a/frida_mode/src/seccomp/seccomp_child.c b/frida_mode/src/seccomp/seccomp_child.c
index f665f472..43a79894 100644
--- a/frida_mode/src/seccomp/seccomp_child.c
+++ b/frida_mode/src/seccomp/seccomp_child.c
@@ -1,4 +1,4 @@
-#ifndef __APPLE__
+#if defined(__linux__) && !defined(__ANDROID__)
 
   #include <fcntl.h>
   #include <sched.h>
diff --git a/frida_mode/src/seccomp/seccomp_event.c b/frida_mode/src/seccomp/seccomp_event.c
index dd4abde7..e2f592ca 100644
--- a/frida_mode/src/seccomp/seccomp_event.c
+++ b/frida_mode/src/seccomp/seccomp_event.c
@@ -1,4 +1,4 @@
-#ifndef __APPLE__
+#if defined(__linux__) && !defined(__ANDROID__)
 
   #include <stdint.h>
   #include <stdio.h>
diff --git a/frida_mode/src/seccomp/seccomp_filter.c b/frida_mode/src/seccomp/seccomp_filter.c
index 13ff7522..8d56c367 100644
--- a/frida_mode/src/seccomp/seccomp_filter.c
+++ b/frida_mode/src/seccomp/seccomp_filter.c
@@ -1,4 +1,4 @@
-#ifndef __APPLE__
+#if defined(__linux__) && !defined(__ANDROID__)
 
   #include <alloca.h>
   #include <errno.h>
diff --git a/frida_mode/src/seccomp/seccomp_print.c b/frida_mode/src/seccomp/seccomp_print.c
index be4d80ce..3cea1239 100644
--- a/frida_mode/src/seccomp/seccomp_print.c
+++ b/frida_mode/src/seccomp/seccomp_print.c
@@ -1,4 +1,4 @@
-#ifndef __APPLE__
+#if defined(__linux__) && !defined(__ANDROID__)
 
   #include <stdarg.h>
 
diff --git a/frida_mode/src/seccomp/seccomp_socket.c b/frida_mode/src/seccomp/seccomp_socket.c
index fae95805..ef937420 100644
--- a/frida_mode/src/seccomp/seccomp_socket.c
+++ b/frida_mode/src/seccomp/seccomp_socket.c
@@ -1,4 +1,4 @@
-#ifndef __APPLE__
+#if defined(__linux__) && !defined(__ANDROID__)
 
   #include <stdio.h>
   #include <string.h>
diff --git a/frida_mode/src/seccomp/seccomp_syscall.c b/frida_mode/src/seccomp/seccomp_syscall.c
index e023c131..8335b93c 100644
--- a/frida_mode/src/seccomp/seccomp_syscall.c
+++ b/frida_mode/src/seccomp/seccomp_syscall.c
@@ -1,4 +1,4 @@
-#ifndef __APPLE__
+#if defined(__linux__) && !defined(__ANDROID__)
 
   #include <limits.h>
   #include <stdio.h>