Update asan_device_setup.sh from LLVM r226816.

tools/android/asan/third_party/asan_device_setup.sh

Index: tools/android/asan/third_party/asan_device_setup.sh
diff --git a/tools/android/asan/third_party/asan_device_setup.sh b/tools/android/asan/third_party/asan_device_setup.sh
new file mode 100755
index 0000000000000000000000000000000000000000..eb50ea4ed1fce89b6cb37fe35b895ef85a4bac58
--- /dev/null
+++ b/tools/android/asan/third_party/asan_device_setup.sh
@@ -0,0 +1,267 @@
+#!/bin/bash
+#===- lib/asan/scripts/asan_device_setup -----------------------------------===#
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+# Prepare Android device to run ASan applications.
+#
+#===------------------------------------------------------------------------===#
+
+set -e
+
+HERE="$(cd "$(dirname "$0")" && pwd)"
+
+revert=no
+extra_options=
+device=
+lib=
+
+function usage {
+    echo "usage: $0 [--revert] [--device device-id] [--lib path] [--extra-options options]"
+    echo "  --revert: Uninstall ASan from the device."
+    echo "  --lib: Path to ASan runtime library."
+    echo "  --extra-options: Extra ASAN_OPTIONS."
+    echo "  --device: Install to the given device. Use 'adb devices' to find"
+    echo "            device-id."
+    echo
+    exit 1
+}
+
+function get_device_arch { # OUTVAR
+    local _outvar=$1
+    local _ABI=$($ADB shell getprop ro.product.cpu.abi)
+    local _ARCH=
+    if [[ $_ABI == x86* ]]; then
+        _ARCH=i686
+    elif [[ $_ABI == armeabi* ]]; then
+        _ARCH=arm
+    else
+        echo "Unrecognized device ABI: $_ABI"
+        exit 1
+    fi
+    eval $_outvar=\$_ARCH
+}
+
+while [[ $# > 0 ]]; do
+  case $1 in
+    --revert)
+      revert=yes
+      ;;
+    --extra-options)
+      shift
+      if [[ $# == 0 ]]; then
+        echo "--extra-options requires an argument."
+        exit 1
+      fi
+      extra_options="$1"
+      ;;
+    --lib)
+      shift
+      if [[ $# == 0 ]]; then
+        echo "--lib requires an argument."
+        exit 1
+      fi
+      lib="$1"
+      ;;
+    --device)
+      shift
+      if [[ $# == 0 ]]; then
+        echo "--device requires an argument."
+        exit 1
+      fi
+      device="$1"
+      ;;
+    *)
+      usage
+      ;;
+  esac
+  shift
+done
+
+ADB=${ADB:-adb}
+if [[ x$device != x ]]; then
+    ADB="$ADB -s $device"
+fi
+
+echo '>> Remounting /system rw'
+$ADB root
+$ADB wait-for-device
+$ADB remount
+$ADB wait-for-device
+
+get_device_arch ARCH
+echo "Target architecture: $ARCH"
+ASAN_RT="libclang_rt.asan-$ARCH-android.so"
+
+if [[ x$revert == xyes ]]; then
+    echo '>> Uninstalling ASan'
+
+    if ! $ADB shell readlink /system/bin/app_process | grep 'app_process' >&/dev/null; then
+        echo '>> Pre-L device detected.'
+        $ADB shell mv /system/bin/app_process.real /system/bin/app_process
+        $ADB shell rm /system/bin/asanwrapper
+        $ADB shell rm /system/lib/$ASAN_RT
+    else
+        $ADB shell rm /system/bin/app_process.wrap
+        $ADB shell rm /system/bin/asanwrapper
+        $ADB shell rm /system/lib/$ASAN_RT
+        $ADB shell rm /system/bin/app_process
+        $ADB shell ln -s /system/bin/app_process32 /system/bin/app_process
+    fi
+
+    echo '>> Restarting shell'
+    $ADB shell stop
+    $ADB shell start
+
+    echo '>> Done'
+    exit 0
+fi
+
+if [[ -d "$lib" ]]; then
+    ASAN_RT_PATH="$lib"
+elif [[ -f "$lib" && "$lib" == *"$ASAN_RT" ]]; then
+    ASAN_RT_PATH=$(dirname "$lib")
+elif [[ -f "$HERE/$ASAN_RT" ]]; then
+    ASAN_RT_PATH="$HERE"
+elif [[ $(basename "$HERE") == "bin" ]]; then
+    # We could be in the toolchain's base directory.
+    # Consider ../lib, ../lib/asan, ../lib/linux and ../lib/clang/$VERSION/lib/linux.
+    P=$(ls "$HERE"/../lib/"$ASAN_RT" "$HERE"/../lib/asan/"$ASAN_RT" "$HERE"/../lib/linux/"$ASAN_RT" "$HERE"/../lib/clang/*/lib/linux/"$ASAN_RT" 2>/dev/null | sort | tail -1)
+    if [[ -n "$P" ]]; then
+        ASAN_RT_PATH="$(dirname "$P")"
+    fi
+fi
+
+if [[ -z "$ASAN_RT_PATH" || ! -f "$ASAN_RT_PATH/$ASAN_RT" ]]; then
+    echo ">> ASan runtime library not found"
+    exit 1
+fi
+
+TMPDIRBASE=$(mktemp -d)
+TMPDIROLD="$TMPDIRBASE/old"
+TMPDIR="$TMPDIRBASE/new"
+mkdir "$TMPDIROLD"
+
+RELEASE=$($ADB shell getprop ro.build.version.release)
+PRE_L=0
+if echo "$RELEASE" | grep '^4\.' >&/dev/null; then
+    PRE_L=1
+fi
+
+if ! $ADB shell readlink /system/bin/app_process | grep 'app_process' >&/dev/null; then
+
+    if $ADB pull /system/bin/app_process.real /dev/null >&/dev/null; then
+        echo '>> Old-style ASan installation detected. Reverting.'
+        $ADB shell mv /system/bin/app_process.real /system/bin/app_process
+    fi
+
+    echo '>> Pre-L device detected. Setting up app_process symlink.'
+    $ADB shell mv /system/bin/app_process /system/bin/app_process32
+    $ADB shell ln -s /system/bin/app_process32 /system/bin/app_process
+fi
+
+echo '>> Copying files from the device'
+$ADB pull /system/bin/app_process.wrap "$TMPDIROLD" || true
+$ADB pull /system/bin/asanwrapper "$TMPDIROLD" || true
+$ADB pull /system/lib/"$ASAN_RT" "$TMPDIROLD" || true
+cp -r "$TMPDIROLD" "$TMPDIR"
+
+if [[ -f "$TMPDIR/app_process.wrap" ]]; then
+    echo ">> Previous installation detected"
+else
+    echo ">> New installation"
+fi
+
+echo '>> Generating wrappers'
+
+cp "$ASAN_RT_PATH/$ASAN_RT" "$TMPDIR/"
+
+# FIXME: alloc_dealloc_mismatch=0 prevents a failure in libdvm startup,
+# which may or may not be a real bug (probably not).
+ASAN_OPTIONS=start_deactivated=1,alloc_dealloc_mismatch=0
+
+# On Android-L not allowing user segv handler breaks some applications.
+if [[ PRE_L -eq 0 ]]; then
+    ASAN_OPTIONS="$ASAN_OPTIONS,allow_user_segv_handler=1"
+fi
+
+if [[ x$extra_options != x ]] ; then
+    ASAN_OPTIONS="$ASAN_OPTIONS,$extra_options"
+fi
+
+# Zygote wrapper.
+cat <<EOF >"$TMPDIR/app_process.wrap"
+#!/system/bin/sh-from-zygote
+ASAN_OPTIONS=$ASAN_OPTIONS \\
+LD_PRELOAD=\$LD_PRELOAD:$ASAN_RT \\
+exec /system/bin/app_process32 \$@
+
+EOF
+
+# General command-line tool wrapper (use for anything that's not started as
+# zygote).
+cat <<EOF >"$TMPDIR/asanwrapper"
+#!/system/bin/sh
+LD_PRELOAD=$ASAN_RT \\
+exec \$@
+
+EOF
+
+if ! ( cd "$TMPDIRBASE" && diff -qr old/ new/ ) ; then
+    echo '>> Pushing files to the device'
+    $ADB push "$TMPDIR/$ASAN_RT" /system/lib/
+    $ADB push "$TMPDIR/app_process.wrap" /system/bin/app_process.wrap
+    $ADB push "$TMPDIR/asanwrapper" /system/bin/asanwrapper
+
+    $ADB shell rm /system/bin/app_process
+    $ADB shell ln -s /system/bin/app_process.wrap /system/bin/app_process
+
+    $ADB shell chown root.shell \
+        /system/lib/"$ASAN_RT" \
+        /system/bin/app_process.wrap \
+        /system/bin/asanwrapper
+    $ADB shell chmod 644 \
+        /system/lib/"$ASAN_RT"
+    $ADB shell chmod 755 \
+        /system/bin/app_process.wrap \
+        /system/bin/asanwrapper
+
+    # Make SELinux happy by keeping app_process wrapper and the shell
+    # it runs on in zygote domain.
+    ENFORCING=0
+    if $ADB shell getenforce | grep Enforcing >/dev/null; then
+        # Sometimes shell is not allowed to change file contexts.
+        # Temporarily switch to permissive.
+        ENFORCING=1
+        $ADB shell setenforce 0
+    fi
+
+    $ADB shell cp /system/bin/sh /system/bin/sh-from-zygote
+
+    if [[ PRE_L -eq 1 ]]; then
+        CTX=u:object_r:system_file:s0
+    else
+        CTX=u:object_r:zygote_exec:s0
+    fi
+    $ADB shell chcon $CTX \
+        /system/bin/sh-from-zygote \
+        /system/bin/app_process.wrap \
+        /system/bin/app_process32
+
+    if [ $ENFORCING == 1 ]; then
+        $ADB shell setenforce 1
+    fi
+
+    echo '>> Restarting shell (asynchronous)'
+    $ADB shell stop
+    $ADB shell start
+
+    echo '>> Please wait until the device restarts'
+else
+    echo '>> Device is up to date'
+fi
+
+rm -r "$TMPDIRBASE"