Switch to the "new" way of ASan deployment on Android devices.

tools/android/asan/asan_device_setup.sh

+#!/bin/bash
+# Copyright (c) 2014 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.
+
+# Prepare Android device to run ASan application.
+#
+# To revert this setup,
+#   adb remount
+#   adb shell mv /system/bin/app_process.real /system/bin/app_process
+#   adb shell rm /system/bin/asanwrapper
+#   adb shell rm /system/lib/libclang_rt.asan-arm-android.so
+
+HERE="$(cd "$(dirname "$0")" && pwd)"

[bulach, 2014/01/17 13:27:53]

every time we start with bash scripts, we end up converting them to python,
since there are *tons* of utilities there already.
I understand this is asan-specific, but would there be any chance of rewriting
it?
would be better with proper options, say, --device, and perhaps --revert?

[frankf, 2014/01/18 01:55:57]

Seconded. But I'm OK with doing the conversion as a follow up.

[eugenis, 2014/01/20 13:51:18]

This is definitely meant to be used as a standalone script, too. People would
need it, for example, to run an asan-instrumented APK (browser or any other
app), and asking them to bring the entire chromium source is way too much.
I'll commit the script to LLVM repository, and this will be a chromium version,
the same as asan_symbolize.py.

We can rewrite it in python, of course, but then we will end up with 2 places
that must be updated if we decide to change the process.

--device and --revert are great ideas, I'll implement them before commit.

+
+ADB=adb
+if [[ x$1 != x ]]; then
+    ADB="adb -s $1"
+fi
+
+TMPDIR=$(mktemp -d)
+echo $TMPDIR
+
+ASAN_RT_PATH="$HERE"
+ASAN_RT="$ASAN_RT_PATH/libclang_rt.asan-arm-android.so"
+
+if ! [[ -f "$ASAN_RT" ]]; then
+    echo "ASan runtime library not found at $ASAN_RT"
+    exit 1
+fi
+
+echo '>> Remounting /system rw'
+$ADB remount
+
+echo '>> Copying files from the device'
+$ADB pull /system/bin/app_process "$TMPDIR/app_process"
+$ADB pull /system/bin/app_process.real "$TMPDIR/app_process.real"
+
+if ! [[ -f "$TMPDIR/app_process" ]]; then
+    echo "app_process missing???"
+    exit 1
+fi
+
+if [[ -f "$TMPDIR/app_process.real" ]]; then
+    echo "app_process.real exists, updating the wrapper"
+else
+    echo "app_process.real missing, new installation"
+    mv "$TMPDIR/app_process" "$TMPDIR/app_process.real"
+fi
+
+echo '>> Generating wrappers'
+# Zygote wrapper.
+cat <<EOF >"$TMPDIR/app_process"
+#!/system/bin/sh
+ASAN_OPTIONS=strict_memcmp=0,malloc_context_size=3,start_deactivated=1 \\
+LD_PRELOAD=libclang_rt.asan-arm-android.so \\
+exec /system/bin/app_process.real \$@
+
+EOF
+
+# General command-line tool wrapper (use for anything that's not started as
+# zygote).
+cat <<EOF >"$TMPDIR/asanwrapper"
+#!/system/bin/sh
+ASAN_OPTIONS=strict_memcmp=0 \
+LD_PRELOAD=libclang_rt.asan-arm-android.so \
+exec \$@
+
+EOF
+
+echo '>> Pushing files to the device'
+$ADB push "$ASAN_RT" /system/lib/
+$ADB push "$TMPDIR/app_process" /system/bin/app_process
+$ADB push "$TMPDIR/app_process.real" /system/bin/app_process.real
+$ADB push "$TMPDIR/asanwrapper" /system/bin/asanwrapper
+$ADB shell chown root.shell \
+    /system/bin/app_process \
+    /system/bin/app_process.real \
+    /system/bin/asanwrapper
+$ADB shell chmod 755 \
+    /system/bin/app_process \
+    /system/bin/app_process.real \
+    /system/bin/asanwrapper
+
+rm -r "$TMPDIR"

[bulach, 2014/01/17 13:27:53]

nit: if people would be running this as a standalone script, then it should say
something about "Please reboot device now"...
if it's not meant to be used standalone, let's do it in python ;)