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[tor-commits] [tor-browser] 61/68: Bug 13379: Sign our MAR files.



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richard pushed a commit to branch tor-browser-91.8.0esr-11.5-1
in repository tor-browser.

commit 89c47ef13dbb74922f6ed863fece8f555c56b177
Author: Kathy Brade <brade@xxxxxxxxxxxxxxxxx>
AuthorDate: Wed Dec 17 16:37:11 2014 -0500

    Bug 13379: Sign our MAR files.
    
    Configure with --enable-verify-mar (when updating, require a valid
      signature on the MAR file before it is applied).
    Use the Tor Browser version instead of the Firefox version inside the
      MAR file info block (necessary to prevent downgrade attacks).
    Use NSS on all platforms for checking MAR signatures (instead of using
      OS-native APIs, which Mozilla does on Mac OS and Windows). So that the
      NSS and NSPR libraries the updater depends on can be found at runtime,
      we add the firefox directory to the shared library search path on macOS.
      On Linux, rpath is used by Mozilla to solve that problem, but that
      approach won't work on macOS because the updater executable is copied
      during the update process to a location that is under TorBrowser-Data,
      and the location of TorBrowser-Data varies.
    
    Also includes the fix for bug 18900.
    
    Bug 19121: reinstate the update.xml hash check
    
    Revert most changes from Mozilla Bug 1373267 "Remove hashFunction and
    hashValue attributes from nsIUpdatePatch and code related to these
    attributes." Changes to the tests were not reverted; the tests have
    been changed significantly and we do not run automated updater tests
    for Tor Browser at this time.
    
    Also partial revert of commit f1241db6986e4b54473a1ed870f7584c75d51122.
    
    Revert the nsUpdateService.js changes from Mozilla Bug 862173 "don't
    verify mar file hash when using mar signing to verify the mar file
    (lessens main thread I/O)."
    
    Changes to the tests were not reverted; the tests have been changed
    significantly and we do not run automated updater tests for
    Tor Browser at this time.
    
    We kept the addition to the AppConstants API in case other JS code
    references it in the future.
---
 .mozconfig                                         |  1 +
 .mozconfig-asan                                    |  1 +
 .mozconfig-mac                                     |  1 +
 .mozconfig-mingw                                   |  1 +
 modules/libmar/tool/mar.c                          |  6 +--
 modules/libmar/tool/moz.build                      | 12 +++--
 modules/libmar/verify/moz.build                    | 14 ++---
 toolkit/modules/AppConstants.jsm                   |  7 +++
 toolkit/mozapps/update/UpdateService.jsm           | 63 +++++++++++++++++++++-
 toolkit/mozapps/update/UpdateTelemetry.jsm         |  1 +
 toolkit/mozapps/update/nsIUpdateService.idl        | 11 ++++
 .../mozapps/update/updater/updater-common.build    | 24 +++++++--
 toolkit/mozapps/update/updater/updater.cpp         | 25 +++++----
 toolkit/xre/moz.build                              |  3 ++
 toolkit/xre/nsUpdateDriver.cpp                     | 50 +++++++++++++++++
 15 files changed, 194 insertions(+), 26 deletions(-)

diff --git a/.mozconfig b/.mozconfig
index 7fe8633a9ef4e..7655f628415e9 100755
--- a/.mozconfig
+++ b/.mozconfig
@@ -37,3 +37,4 @@ ac_add_options MOZ_TELEMETRY_REPORTING=
 ac_add_options --enable-tor-launcher
 ac_add_options --with-tor-browser-version=dev-build
 ac_add_options --disable-tor-browser-update
+ac_add_options --enable-verify-mar
diff --git a/.mozconfig-asan b/.mozconfig-asan
index 98ea6ac6f3fec..8bee813bfee8a 100644
--- a/.mozconfig-asan
+++ b/.mozconfig-asan
@@ -30,6 +30,7 @@ ac_add_options --enable-official-branding
 ac_add_options --enable-default-toolkit=cairo-gtk3
 
 ac_add_options --enable-tor-browser-update
+ac_add_options --enable-verify-mar
 
 ac_add_options --disable-strip
 ac_add_options --disable-install-strip
diff --git a/.mozconfig-mac b/.mozconfig-mac
index 26e2b6b92fdbe..5b4624ef1f673 100644
--- a/.mozconfig-mac
+++ b/.mozconfig-mac
@@ -43,6 +43,7 @@ ac_add_options --disable-debug
 
 ac_add_options --enable-tor-browser-data-outside-app-dir
 ac_add_options --enable-tor-browser-update
+ac_add_options --enable-verify-mar
 
 ac_add_options --disable-crashreporter
 ac_add_options --disable-webrtc
diff --git a/.mozconfig-mingw b/.mozconfig-mingw
index 3ec6ff18a3e91..ce6ace1dad67f 100644
--- a/.mozconfig-mingw
+++ b/.mozconfig-mingw
@@ -15,6 +15,7 @@ ac_add_options --enable-strip
 ac_add_options --enable-official-branding
 
 ac_add_options --enable-tor-browser-update
+ac_add_options --enable-verify-mar
 ac_add_options --disable-bits-download
 
 # Let's make sure no preference is enabling either Adobe's or Google's CDM.
diff --git a/modules/libmar/tool/mar.c b/modules/libmar/tool/mar.c
index 0bf2cb4bd1d4c..ea2b79924914b 100644
--- a/modules/libmar/tool/mar.c
+++ b/modules/libmar/tool/mar.c
@@ -65,7 +65,7 @@ static void print_usage() {
       "signed_input_archive.mar base_64_encoded_signature_file "
       "changed_signed_output.mar\n");
   printf("(i) is the index of the certificate to extract\n");
-#  if defined(XP_MACOSX) || (defined(XP_WIN) && !defined(MAR_NSS))
+#  if (defined(XP_MACOSX) || defined(XP_WIN)) && !defined(MAR_NSS)
   printf("Verify a MAR file:\n");
   printf("  mar [-C workingDir] -D DERFilePath -v signed_archive.mar\n");
   printf(
@@ -149,7 +149,7 @@ int main(int argc, char** argv) {
   memset((void*)certBuffers, 0, sizeof(certBuffers));
 #endif
 #if !defined(NO_SIGN_VERIFY) && \
-    ((!defined(MAR_NSS) && defined(XP_WIN)) || defined(XP_MACOSX))
+    (!defined(MAR_NSS) && (defined(XP_WIN) || defined(XP_MACOSX)))
   memset(DERFilePaths, 0, sizeof(DERFilePaths));
   memset(fileSizes, 0, sizeof(fileSizes));
 #endif
@@ -181,7 +181,7 @@ int main(int argc, char** argv) {
       argc -= 2;
     }
 #if !defined(NO_SIGN_VERIFY)
-#  if (!defined(MAR_NSS) && defined(XP_WIN)) || defined(XP_MACOSX)
+#  if (!defined(MAR_NSS) && (defined(XP_WIN) || defined(XP_MACOSX)))
     /* -D DERFilePath, also matches -D[index] DERFilePath
        We allow an index for verifying to be symmetric
        with the import and export command line arguments. */
diff --git a/modules/libmar/tool/moz.build b/modules/libmar/tool/moz.build
index a6d26c66a668e..d6fa1677ddf16 100644
--- a/modules/libmar/tool/moz.build
+++ b/modules/libmar/tool/moz.build
@@ -43,15 +43,21 @@ if CONFIG["MOZ_BUILD_APP"] != "tools/update-packaging":
         "verifymar",
     ]
 
+    if CONFIG["TOR_BROWSER_UPDATE"]:
+        DEFINES["MAR_NSS"] = True
+
     if CONFIG["OS_ARCH"] == "WINNT":
         USE_STATIC_LIBS = True
 
         OS_LIBS += [
             "ws2_32",
-            "crypt32",
-            "advapi32",
         ]
-    elif CONFIG["OS_ARCH"] == "Darwin":
+        if not CONFIG["TOR_BROWSER_UPDATE"]:
+            OS_LIBS += [
+                "crypt32",
+                "advapi32",
+            ]
+    elif CONFIG["OS_ARCH"] == "Darwin" and not CONFIG["TOR_BROWSER_UPDATE"]:
         OS_LIBS += [
             "-framework Security",
         ]
diff --git a/modules/libmar/verify/moz.build b/modules/libmar/verify/moz.build
index b07475655f0dc..03718eee50b47 100644
--- a/modules/libmar/verify/moz.build
+++ b/modules/libmar/verify/moz.build
@@ -16,15 +16,12 @@ FORCE_STATIC_LIB = True
 if CONFIG["OS_ARCH"] == "WINNT":
     USE_STATIC_LIBS = True
 elif CONFIG["OS_ARCH"] == "Darwin":
-    UNIFIED_SOURCES += [
-        "MacVerifyCrypto.cpp",
-    ]
-    OS_LIBS += [
-        "-framework Security",
+    USE_LIBS += [
+        "nspr",
+        "nss",
+        "signmar",
     ]
 else:
-    DEFINES["MAR_NSS"] = True
-    LOCAL_INCLUDES += ["../sign"]
     USE_LIBS += [
         "nspr",
         "nss",
@@ -38,6 +35,9 @@ else:
         "-Wl,-rpath=\\$$ORIGIN",
     ]
 
+DEFINES["MAR_NSS"] = True
+LOCAL_INCLUDES += ["../sign"]
+
 LOCAL_INCLUDES += [
     "../src",
 ]
diff --git a/toolkit/modules/AppConstants.jsm b/toolkit/modules/AppConstants.jsm
index ea10dc97535d2..3cb1518f2ab32 100644
--- a/toolkit/modules/AppConstants.jsm
+++ b/toolkit/modules/AppConstants.jsm
@@ -212,6 +212,13 @@ this.AppConstants = Object.freeze({
   false,
 #endif
 
+  MOZ_VERIFY_MAR_SIGNATURE:
+#ifdef MOZ_VERIFY_MAR_SIGNATURE
+  true,
+#else
+  false,
+#endif
+
   MOZ_MAINTENANCE_SERVICE:
 #ifdef MOZ_MAINTENANCE_SERVICE
   true,
diff --git a/toolkit/mozapps/update/UpdateService.jsm b/toolkit/mozapps/update/UpdateService.jsm
index 8552240a1df67..f0a48d0216386 100644
--- a/toolkit/mozapps/update/UpdateService.jsm
+++ b/toolkit/mozapps/update/UpdateService.jsm
@@ -999,6 +999,20 @@ function LOG(string) {
   }
 }
 
+/**
+ * Convert a string containing binary values to hex.
+ */
+function binaryToHex(input) {
+  var result = "";
+  for (var i = 0; i < input.length; ++i) {
+    var hex = input.charCodeAt(i).toString(16);
+    if (hex.length == 1)
+      hex = "0" + hex;
+    result += hex;
+  }
+  return result;
+}
+
 /**
  * Gets the specified directory at the specified hierarchy under the
  * update root directory and creates it if it doesn't exist.
@@ -2022,6 +2036,8 @@ function UpdatePatch(patch) {
         }
         break;
       case "finalURL":
+      case "hashFunction":
+      case "hashValue":
       case "state":
       case "type":
       case "URL":
@@ -2041,6 +2057,8 @@ UpdatePatch.prototype = {
   // over writing nsIUpdatePatch attributes.
   _attrNames: [
     "errorCode",
+    "hashFunction",
+    "hashValue",
     "finalURL",
     "selected",
     "size",
@@ -2054,6 +2072,8 @@ UpdatePatch.prototype = {
    */
   serialize: function UpdatePatch_serialize(updates) {
     var patch = updates.createElementNS(URI_UPDATE_NS, "patch");
+    patch.setAttribute("hashFunction", this.hashFunction);
+    patch.setAttribute("hashValue", this.hashValue);
     patch.setAttribute("size", this.size);
     patch.setAttribute("type", this.type);
     patch.setAttribute("URL", this.URL);
@@ -5278,7 +5298,42 @@ Downloader.prototype = {
     }
 
     LOG("Downloader:_verifyDownload downloaded size == expected size.");
-    return true;
+    let fileStream = Cc["@mozilla.org/network/file-input-stream;1"].
+                     createInstance(Ci.nsIFileInputStream);
+    fileStream.init(destination, FileUtils.MODE_RDONLY, FileUtils.PERMS_FILE, 0);
+
+    let digest;
+    try {
+      let hash = Cc["@mozilla.org/security/hash;1"].
+                 createInstance(Ci.nsICryptoHash);
+      var hashFunction = Ci.nsICryptoHash[this._patch.hashFunction.toUpperCase()];
+      if (hashFunction == undefined) {
+        throw Cr.NS_ERROR_UNEXPECTED;
+      }
+      hash.init(hashFunction);
+      hash.updateFromStream(fileStream, -1);
+      // NOTE: For now, we assume that the format of _patch.hashValue is hex
+      // encoded binary (such as what is typically output by programs like
+      // sha1sum).  In the future, this may change to base64 depending on how
+      // we choose to compute these hashes.
+      digest = binaryToHex(hash.finish(false));
+    } catch (e) {
+      LOG("Downloader:_verifyDownload - failed to compute hash of the " +
+          "downloaded update archive");
+      digest = "";
+    }
+
+    fileStream.close();
+
+    if (digest == this._patch.hashValue.toLowerCase()) {
+      LOG("Downloader:_verifyDownload hashes match.");
+      return true;
+    }
+
+    LOG("Downloader:_verifyDownload hashes do not match. ");
+    AUSTLMY.pingDownloadCode(this.isCompleteUpdate,
+                             AUSTLMY.DWNLD_ERR_VERIFY_NO_HASH_MATCH);
+    return false;
   },
 
   /**
@@ -5875,6 +5930,9 @@ Downloader.prototype = {
           " is higher than patch size: " +
           this._patch.size
       );
+      // It's important that we use a different code than
+      // NS_ERROR_CORRUPTED_CONTENT so that tests can verify the difference
+      // between a hash error and a wrong download error.
       AUSTLMY.pingDownloadCode(
         this.isCompleteUpdate,
         AUSTLMY.DWNLD_ERR_PATCH_SIZE_LARGER
@@ -5893,6 +5951,9 @@ Downloader.prototype = {
           " is not equal to expected patch size: " +
           this._patch.size
       );
+      // It's important that we use a different code than
+      // NS_ERROR_CORRUPTED_CONTENT so that tests can verify the difference
+      // between a hash error and a wrong download error.
       AUSTLMY.pingDownloadCode(
         this.isCompleteUpdate,
         AUSTLMY.DWNLD_ERR_PATCH_SIZE_NOT_EQUAL
diff --git a/toolkit/mozapps/update/UpdateTelemetry.jsm b/toolkit/mozapps/update/UpdateTelemetry.jsm
index dae76e09acd05..df5b8917970e7 100644
--- a/toolkit/mozapps/update/UpdateTelemetry.jsm
+++ b/toolkit/mozapps/update/UpdateTelemetry.jsm
@@ -192,6 +192,7 @@ var AUSTLMY = {
   DWNLD_ERR_VERIFY_NO_REQUEST: 13,
   DWNLD_ERR_VERIFY_PATCH_SIZE_NOT_EQUAL: 14,
   DWNLD_ERR_WRITE_FAILURE: 15,
+  DWNLD_ERR_VERIFY_NO_HASH_MATCH: 16,
   // Temporary failure code to see if there are failures without an update phase
   DWNLD_UNKNOWN_PHASE_ERR_WRITE_FAILURE: 40,
 
diff --git a/toolkit/mozapps/update/nsIUpdateService.idl b/toolkit/mozapps/update/nsIUpdateService.idl
index e0a075cfd1265..e3b0252b527a8 100644
--- a/toolkit/mozapps/update/nsIUpdateService.idl
+++ b/toolkit/mozapps/update/nsIUpdateService.idl
@@ -39,6 +39,17 @@ interface nsIUpdatePatch : nsISupports
    */
   attribute AString finalURL;
 
+  /**
+   * The hash function to use when determining this file's integrity
+   */
+  attribute AString hashFunction;
+
+  /**
+   * The value of the hash function named above that should be computed if
+   * this file is not corrupt.
+   */
+  attribute AString hashValue;
+
   /**
    * The size of this file, in bytes.
    */
diff --git a/toolkit/mozapps/update/updater/updater-common.build b/toolkit/mozapps/update/updater/updater-common.build
index 13926ea820468..a4173889271bc 100644
--- a/toolkit/mozapps/update/updater/updater-common.build
+++ b/toolkit/mozapps/update/updater/updater-common.build
@@ -4,6 +4,10 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+DEFINES["MAR_NSS"] = True
+
+link_with_nss = DEFINES["MAR_NSS"] or (CONFIG["OS_ARCH"] == "Linux" and CONFIG["MOZ_VERIFY_MAR_SIGNATURE"])
+
 srcs = [
     "archivereader.cpp",
     "updater.cpp",
@@ -36,10 +40,14 @@ if CONFIG["OS_ARCH"] == "WINNT":
         "ws2_32",
         "shell32",
         "shlwapi",
-        "crypt32",
-        "advapi32",
     ]
 
+    if not link_with_nss:
+        OS_LIBS += [
+            "crypt32",
+            "advapi32",
+        ]
+
 USE_LIBS += [
     "bspatch",
     "mar",
@@ -47,6 +55,13 @@ USE_LIBS += [
     "xz-embedded",
 ]
 
+if link_with_nss:
+    USE_LIBS += [
+        "nspr",
+        "nss",
+        "signmar",
+    ]
+
 if CONFIG["MOZ_WIDGET_TOOLKIT"] == "gtk":
     have_progressui = 1
     srcs += [
@@ -61,9 +76,12 @@ if CONFIG["MOZ_WIDGET_TOOLKIT"] == "cocoa":
     ]
     OS_LIBS += [
         "-framework Cocoa",
-        "-framework Security",
         "-framework SystemConfiguration",
     ]
+    if not link_with_nss:
+        OS_LIBS += [
+            "-framework Security",
+        ]
     UNIFIED_SOURCES += [
         "/toolkit/xre/updaterfileutils_osx.mm",
     ]
diff --git a/toolkit/mozapps/update/updater/updater.cpp b/toolkit/mozapps/update/updater/updater.cpp
index b9b982367137b..f1598ea9b529e 100644
--- a/toolkit/mozapps/update/updater/updater.cpp
+++ b/toolkit/mozapps/update/updater/updater.cpp
@@ -110,9 +110,11 @@ struct UpdateServerThreadArgs {
 #  define stat64 stat
 #endif
 
-#if defined(MOZ_VERIFY_MAR_SIGNATURE) && !defined(XP_WIN) && !defined(XP_MACOSX)
-#  include "nss.h"
-#  include "prerror.h"
+#if defined(MOZ_VERIFY_MAR_SIGNATURE)
+#  if defined(MAR_NSS) || (!defined(XP_WIN) && !defined(XP_MACOSX))
+#    include "nss.h"
+#    include "prerror.h"
+#  endif
 #endif
 
 #include "crctable.h"
@@ -2726,8 +2728,13 @@ static void UpdateThreadFunc(void* param) {
         if (ReadMARChannelIDs(updateSettingsPath, &MARStrings) != OK) {
           rv = UPDATE_SETTINGS_FILE_CHANNEL;
         } else {
+#  ifdef TOR_BROWSER_UPDATE
+          const char* appVersion = TOR_BROWSER_VERSION_QUOTED;
+#  else
+          const char* appVersion = MOZ_APP_VERSION;
+#  endif
           rv = gArchiveReader.VerifyProductInformation(
-              MARStrings.MARChannelID.get(), MOZ_APP_VERSION);
+              MARStrings.MARChannelID.get(), appVersion);
         }
       }
     }
@@ -2963,11 +2970,10 @@ int NS_main(int argc, NS_tchar** argv) {
   }
 #endif
 
-#if defined(MOZ_VERIFY_MAR_SIGNATURE) && !defined(XP_WIN) && !defined(XP_MACOSX)
-  // On Windows and Mac we rely on native APIs to do verifications so we don't
-  // need to initialize NSS at all there.
-  // Otherwise, minimize the amount of NSS we depend on by avoiding all the NSS
-  // databases.
+#if defined(MOZ_VERIFY_MAR_SIGNATURE)
+#  if defined(MAR_NSS) || (!defined(XP_WIN) && !defined(XP_MACOSX))
+  // If using NSS for signature verification, initialize NSS but minimize
+  // the portion we depend on by avoiding all of the NSS databases.
   if (NSS_NoDB_Init(nullptr) != SECSuccess) {
     PRErrorCode error = PR_GetError();
     fprintf(stderr, "Could not initialize NSS: %s (%d)", PR_ErrorToName(error),
@@ -2975,6 +2981,7 @@ int NS_main(int argc, NS_tchar** argv) {
     _exit(1);
   }
 #endif
+#endif
 
 #ifdef XP_MACOSX
   if (!isElevated) {
diff --git a/toolkit/xre/moz.build b/toolkit/xre/moz.build
index 90d06481ee9e3..56a2d7173d3c9 100644
--- a/toolkit/xre/moz.build
+++ b/toolkit/xre/moz.build
@@ -233,6 +233,9 @@ for var in ("APP_VERSION", "APP_ID"):
 if CONFIG["MOZ_BUILD_APP"] == "browser":
     DEFINES["MOZ_BUILD_APP_IS_BROWSER"] = True
 
+if CONFIG['TOR_BROWSER_UPDATE']:
+    DEFINES['MAR_NSS'] = True
+
 LOCAL_INCLUDES += [
     "../../other-licenses/nsis/Contrib/CityHash/cityhash",
     "../components/find",
diff --git a/toolkit/xre/nsUpdateDriver.cpp b/toolkit/xre/nsUpdateDriver.cpp
index 2b176266b05ff..c230567bd0139 100644
--- a/toolkit/xre/nsUpdateDriver.cpp
+++ b/toolkit/xre/nsUpdateDriver.cpp
@@ -366,6 +366,42 @@ static nsresult GetUpdateDirFromAppDir(nsIFile* aAppDir, nsIFile** aResult) {
 #  endif
 #endif
 
+#if defined(TOR_BROWSER_UPDATE) && defined(MOZ_VERIFY_MAR_SIGNATURE) && \
+    defined(MAR_NSS) && defined(XP_MACOSX)
+/**
+ * Ideally we would save and restore the original library path value after
+ * the updater finishes its work (and before firefox is re-launched).
+ * Doing so would avoid potential problems like the following bug:
+ *   https://bugzilla.mozilla.org/show_bug.cgi?id=1434033
+ */
+/**
+ * Appends the specified path to the library path.
+ * This is used so that the updater can find libnss3.dylib and other
+ * shared libs.
+ *
+ * @param pathToAppend A new library path to prepend to the dynamic linker's
+ * search path.
+ */
+#  include "prprf.h"
+#  define PATH_SEPARATOR ":"
+#  define LD_LIBRARY_PATH_ENVVAR_NAME "DYLD_LIBRARY_PATH"
+static void AppendToLibPath(const char* pathToAppend) {
+  char* pathValue = getenv(LD_LIBRARY_PATH_ENVVAR_NAME);
+  if (nullptr == pathValue || '\0' == *pathValue) {
+    // Leak the string because that is required by PR_SetEnv.
+    char* s =
+        Smprintf("%s=%s", LD_LIBRARY_PATH_ENVVAR_NAME, pathToAppend).release();
+    PR_SetEnv(s);
+  } else {
+    // Leak the string because that is required by PR_SetEnv.
+    char* s = Smprintf("%s=%s" PATH_SEPARATOR "%s", LD_LIBRARY_PATH_ENVVAR_NAME,
+                       pathToAppend, pathValue)
+                  .release();
+    PR_SetEnv(s);
+  }
+}
+#endif
+
 /**
  * Applies, switches, or stages an update.
  *
@@ -612,6 +648,20 @@ static void ApplyUpdate(nsIFile* greDir, nsIFile* updateDir, nsIFile* appDir,
     PR_SetEnv("MOZ_SAFE_MODE_RESTART=1");
   }
 
+#if defined(TOR_BROWSER_UPDATE) && defined(MOZ_VERIFY_MAR_SIGNATURE) && \
+    defined(MAR_NSS) && defined(XP_MACOSX)
+  // On macOS, append the app directory to the shared library search path
+  // so the system can locate the shared libraries that are needed by the
+  // updater, e.g., libnss3.dylib).
+  nsAutoCString appPath;
+  nsresult rv2 = appDir->GetNativePath(appPath);
+  if (NS_SUCCEEDED(rv2)) {
+    AppendToLibPath(appPath.get());
+  } else {
+    LOG(("ApplyUpdate -- appDir->GetNativePath() failed (0x%x)\n", rv2));
+  }
+#endif
+
   LOG(("spawning updater process [%s]\n", updaterPath.get()));
 #ifdef DEBUG
   dump_argv("ApplyUpdate updater", argv, argc);

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