kc3-lang/automake/t/built-sources-fork-bomb.sh

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• Hash : 3562e384
  Author :
  Date : 2017-09-16T13:03:36
  

  Prefer https: URLs
  
  In Gnulib, Emacs, etc. we are changing ftp: and http: URLs to use
  https:, to discourage man-in-the-middle attacks when downloading
  software. The attached patch propagates these changes upstream to
  Automake.  This patch does not affect files that Automake is
  downstream of, which I'll patch separately.
  
  Althouth the resources are not secret, plain HTTP is vulnerable to
  malicious routers that tamper with responses from GNU servers,
  and this sort of thing is all too common when people in some other
  countries browse US-based websites. See, for example:
  
  Aceto G, Botta A, Pescapé A, Awan MF, Ahmad T, Qaisar
  S. Analyzing internet censorship in Pakistan. RTSI
  2016. https://dx.doi.org/10.1109/RTSI.2016.7740626
  
  HTTPS is not a complete solution here, but it can be a significant
  help. The GNU project regularly serves up code to users, so we should
  take some care here.
  

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• t/built-sources-fork-bomb.sh

• #! /bin/sh
  # Copyright (C) 2012-2017 Free Software Foundation, Inc.
  #
  # This program is free software; you can redistribute it and/or modify
  # it under the terms of the GNU General Public License as published by
  # the Free Software Foundation; either version 2, or (at your option)
  # any later version.
  #
  # This program is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  # GNU General Public License for more details.
  #
  # You should have received a copy of the GNU General Public License
  # along with this program.  If not, see <https://www.gnu.org/licenses/>.
  
  # Due to how the handling of $(BUILT_SOURCES) is implemented in Automake-NG,
  # a recursive make call in the recipe of any $(BUILT_SOURCES) (or of any of
  # its prerequisites) might cause an infinite recursion (complete with fork
  # bomb, yuck) if not handled correctly.  Verify that this doesn't happen.
  # For more background, see:
  # <https://lists.gnu.org/archive/html/help-smalltalk/2012-08/msg00027.html>
  # <https://lists.gnu.org/archive/html/automake-patches/2012-08/msg00052.html>
  # Backported to improve coverage of mainline Automake.
  
  required=GNUmake
  . test-init.sh
  
  echo AC_OUTPUT >> configure.ac
  
  cat > Makefile.am << 'END'
  BUILT_SOURCES = foo
  .PHONY: build-foo
  build-foo:
  	echo OK > foo
  foo:
  	$(MAKE) build-foo
  
  # If the bug is still present, we want this test to fail, not to actually
  # go fork bomb and potentially crash the user machine.  Take care of that.
  
  is_too_deep := $(shell test $(MAKELEVEL) -lt 10 && echo no)
  
  ## Extra indentation here required to avoid confusing Automake.
   ifeq ($(is_too_deep),no)
     # All is ok.
   else
     $(error ::OOPS:: Recursion too deep, $(MAKELEVEL) levels)
   endif
  END
  
  $ACLOCAL
  $AUTOMAKE -Wno-portability
  $AUTOCONF
  
  ./configure
  
  run_make -M -- -n foo
  test ! -f foo
  # Guard against possible infinite recursion.
  $FGREP '::OOPS::' output && exit 1
  
  run_make -M -- foo
  # Guard against possible infinite recursion.
  $FGREP '::OOPS::' output && exit 1
  
  :
  

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