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#!/bin/sh
# Ensure a stack overflow no longer segfaults
. "${srcdir=.}/init.sh"; path_prepend_ ../src
echo grep: stack overflow > exp || framework_failure_
# Limit stack size. Otherwise, it appears to be too hard to overflow the
# stack on some systems like gcc113, aarch64/linux-3.13.0 with 32GB of RAM
# and 20GB of swap.
ulimit -s 8192 2>/dev/null
# grep attempts to detect overflow via gnulib's c-stack module.
# Trigger that with an input regex composed solely of open parentheses,
# increasing the size of that input until grep emits the expected diagnostic.
fail=0
for i in 1 3 5 10 20 30 40 50 100 200 400 1000; do
# Create a file containing $i * 10000 open parentheses:
printf %0${i}0000d 0|tr 0 '(' > in || framework_failure_
grep -E -f in >out 2>err; st=$?
if grep -q 'stack overflow' err; then
test $st = 2 || fail=1
compare /dev/null out || fail=1
compare exp err || fail=1
test $fail = 0 && Exit 0
fail_ 'printed "stack overflow", but something else was wrong'
fi
done
# If there was no stack overflow message and the final run exited with
# status 1 and both stdout and stderr were empty, then assume it's a working
# regex that avoids the internal stack overflow problem like glibc's regexp
# used to.
test $st = 1 \
&& ! test -s out \
&& ! test -s err \
&& Exit 0
fail_ 'grep never printed "stack overflow"'
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