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Diffstat (limited to 'checks/stackovf.test')
-rwxr-xr-x | checks/stackovf.test | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/checks/stackovf.test b/checks/stackovf.test new file mode 100755 index 0000000..8be673e --- /dev/null +++ b/checks/stackovf.test @@ -0,0 +1,99 @@ +#!/bin/sh +# This file is part of the GNU m4 testsuite +# Copyright (C) 2000, 2003, 2007-2013 Free Software Foundation, Inc. +# +# This file is part of GNU M4. +# +# GNU M4 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 3 of the License, or +# (at your option) any later version. +# +# GNU M4 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 <http://www.gnu.org/licenses/>. + +# Script to verify that stack overflow is diagnosed properly when +# there is infinite macro call nesting, provided the OS supports it. + +m4="$1" + +# Skip this test if -L defaults to 1024 instead of 0, as that is our +# indicator that the OS does not support stack overflow detection. +("$m4" --help | grep 'nesting.*\[0\]') >/dev/null 2>&1 \ + || { + echo "$0: skipping test, no stack overflow support detected in $m4" + exit 77 + } + +# On some systems the ulimit command is available in ksh or bash but not sh +(exec 2>/dev/null; ulimit -Ss 300) || { + for altshell in bash bsh ksh zsh ; do + if (exec >/dev/null 2>&1; $altshell -c 'ulimit -Ss 300') && test -z "$2" + then + echo "Using $altshell because it supports ulimit" + exec $altshell "$0" "$@" running-with-$altshell + exit 1 + fi + done +} + +tmpdir= +trap 'st=$?; rm -rf "$tmpdir" && exit $st' 0 +trap '(exit $?); exit $?' 1 2 3 15 + +# Create a temporary subdirectory $tmpdir in $TMPDIR (default /tmp). +# Use mktemp if possible; otherwise fall back on mkdir, +# with $RANDOM to make collisions less likely. +: ${TMPDIR=/tmp} +{ + tmpdir=` + (umask 077 && mktemp -d "$TMPDIR/m4stk-XXXXXX") 2>/dev/null + ` && + test -n "$tmpdir" && test -d "$tmpdir" +} || { + tmpdir=$TMPDIR/m4stk-$$-$RANDOM + (umask 077 && mkdir "$tmpdir") +} || exit $? +tmpfile="$tmpdir"/m4.out + +# Limit the stack size if the shell we are running permits it +if (exec 2>/dev/null; ulimit -Ss 300) +then + ulimit -Ss 300 + echo "Stack soft limit set to `ulimit -s`K"; +else + echo "Can't reset stack limit - this may take a while..." +fi + +# Induce stack overflow. +echo 'define(a,a(a))a' | "$m4" > "$tmpfile" 2>&1 +result=$? + +exitcode=1 +if test $result -eq 0 ; then + echo "Failure - $m4 did not abort" +else + # See if stack overflow was diagnosed. + case `cat "$tmpfile"` in + *stack\ overflow*) + case `echo "$tmpdir"/*` in + $tmpfile) + echo "Pass" + exitcode=0 ;; + *) echo "Failure - $m4 created unexpected core dump" + ls -l "$tmpdir" ;; + esac ;; + *) echo "Failure - $m4 aborted unexpectedly"; + ;; + esac +fi + +test $exitcode = 0 || + { echo "Output from $m4:"; cat $tmpfile; } + +exit $exitcode |