Linux Sandbox: get everything to compile on Android.

We define our own android_arm_ucontext.h file since
signal.h doesn't define ucontext_t on Android.

BUG=166704
NOTRY=true


Review URL: https://chromiumcodereview.appspot.com/11618010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@174070 0039d316-1c4b-4281-b951-d872f2087c98

sandbox/linux/sandbox_linux.gypi

@@ -25,12 +25,6 @@
       ['OS == "android"', {
         'sources/': [
           ['include', '^linux/'],
-          # TODO(jln): some files don't yet even compile on Android.
-          # crbug.com/166704
-          ['exclude', 'errorcode_unittest\\.cc$'],
-          ['exclude', 'sandbox_bpf\\.cc$'],
-          ['exclude', 'sandbox_bpf_unittest\\.cc$'],
-          ['exclude', 'syscall_unittest\\.cc$'],
         ],
       }],
     ],
@@ -101,6 +95,11 @@
             'seccomp-bpf/syscall_unittest.cc',
           ],
         }],
+        ['OS == "android" and gtest_target_type == "shared_library"', {
+          'dependencies': [
+            '../testing/android/native_test.gyp:native_test_native_code',
+          ]
+        }],
       ],
     },
     {

sandbox/linux/seccomp-bpf/sandbox_bpf.cc

@@ -2,6 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <signal.h>
+#include <sys/prctl.h>
+#include <sys/syscall.h>
+
 #ifndef SECCOMP_BPF_STANDALONE
 #include "base/logging.h"
 #include "base/posix/eintr_wrapper.h"
@@ -13,6 +17,11 @@
 #include "sandbox/linux/seccomp-bpf/syscall_iterator.h"
 #include "sandbox/linux/seccomp-bpf/verifier.h"
 
+// Android's signal.h doesn't define ucontext etc.
+#if defined(OS_ANDROID) && defined(__arm__)
+#include "sandbox/linux/services/android_arm_ucontext.h"
+#endif
+
 namespace {
 
 void WriteFailedStderrSetupMessage(int out_fd) {
@@ -40,7 +49,8 @@ void WriteFailedStderrSetupMessage(int out_fd) {
 // way to mark a signal as allocated. So, the potential for collision is
 // possibly even worse.
 bool GetIsInSigHandler(const ucontext_t *ctx) {
-  return sigismember(&ctx->uc_sigmask, SIGBUS);
+  // Note: on Android, sigismember does not take a pointer to const.
+  return sigismember(const_cast<sigset_t*>(&ctx->uc_sigmask), SIGBUS);
 }
 
 void SetIsInSigHandler() {

sandbox/linux/seccomp-bpf/sandbox_bpf.h

@@ -85,6 +85,10 @@
 #endif
 
 // For prctl.h
+#ifndef PR_SET_SECCOMP
+#define PR_SET_SECCOMP               22
+#define PR_GET_SECCOMP               21
+#endif
 #ifndef PR_SET_NO_NEW_PRIVS
 #define PR_SET_NO_NEW_PRIVS          38
 #define PR_GET_NO_NEW_PRIVS          39

sandbox/linux/seccomp-bpf/sandbox_bpf_unittest.cc

@@ -15,6 +15,12 @@
 #include "sandbox/linux/services/linux_syscalls.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+// Workaround for Android's prctl.h file.
+#if !defined(PR_CAPBSET_READ)
+#define PR_CAPBSET_READ 23
+#define PR_CAPBSET_DROP 24
+#endif
+
 using namespace playground2;
 using sandbox::BrokerProcess;
 

sandbox/linux/services/android_arm_ucontext.h

@@ -0,0 +1,21 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SANDBOX_LINUX_SERVICES_ANDROID_ARM_UCONTEXT_H_
+#define SANDBOX_LINUX_SERVICES_ANDROID_ARM_UCONTEXT_H_
+typedef long int greg_t;
+typedef unsigned long sigset_t;
+typedef struct ucontext {
+  unsigned long   uc_flags;
+  struct ucontext  *uc_link;
+  stack_t     uc_stack;
+  struct sigcontext uc_mcontext;
+  sigset_t    uc_sigmask;
+  /* Allow for uc_sigmask growth.  Glibc uses a 1024-bit sigset_t.  */
+  int     __not_used[32 - (sizeof (sigset_t) / sizeof (int))];
+  /* Last for extensibility.  Eight byte aligned because some
+     coprocessors require eight byte alignment.  */
+  unsigned long   uc_regspace[128] __attribute__((__aligned__(8)));
+} ucontext_t;
+#endif  // SANDBOX_LINUX_SERVICES_ANDROID_ARM_UCONTEXT_H_