| 1 | #!/bin/sh
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| 2 | # Ensure a stack overflow no longer segfaults
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| 3 |
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| 4 | . "${srcdir=.}/init.sh"; path_prepend_ ../src
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| 5 |
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| 6 | case $host_triplet in
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| 7 | *-midnightbsd*)
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| 8 | skip_ 'our stack-overflow detection does not work on this system';;
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| 9 | esac
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| 10 |
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| 11 | # When compiled with ASAN, skip this test, because (on Fedora 32) it
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| 12 | # would fail due to output like this on stderr:
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| 13 | # +==2176827==WARNING: ASan is ignoring requested __asan_handle_no_return:
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| 14 | # stack top: 0x7ffc48f20000; bottom 0x000000e25000; size: 0x7ffc480fb000 (140721517473792)
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| 15 | # +False positive error reports may follow
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| 16 | # +For details see https://github.com/google/sanitizers/issues/189
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| 17 | ASAN_OPTIONS=help=true grep --version 2>&1 | grep -q AddressSanitizer \
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| 18 | && skip_ 'avoid false failure when built with ASAN'
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| 19 |
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| 20 | echo grep: stack overflow > exp || framework_failure_
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| 21 |
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| 22 | # Limit stack size. Otherwise, it appears to be too hard to overflow the
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| 23 | # stack on some systems like gcc113, aarch64/linux-3.13.0 with 32GB of RAM
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| 24 | # and 20GB of swap.
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| 25 | ulimit -s 8192 2>/dev/null
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| 26 |
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| 27 | # grep attempts to detect overflow via gnulib's c-stack module.
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| 28 | # Trigger that with an input regex composed solely of open parentheses,
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| 29 | # increasing the size of that input until grep emits the expected diagnostic.
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| 30 | fail=0
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| 31 | for i in 1 3 5 10 20 30 40 50 100 200 400 1000; do
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| 32 | # Create a file containing $i * 10000 open parentheses:
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| 33 | printf %0${i}0000d 0|tr 0 '(' > in || framework_failure_
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| 34 | grep -E -f in >out 2>err; st=$?
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| 35 | if grep -q 'stack overflow' err; then
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| 36 | test $st = 2 || fail=1
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| 37 | compare /dev/null out || fail=1
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| 38 | compare exp err || fail=1
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| 39 | test $fail = 0 && Exit 0
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| 40 | fail_ 'printed "stack overflow", but something else was wrong'
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| 41 | fi
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| 42 | done
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| 43 |
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| 44 | # If there was no stack overflow message and the final run exited with
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| 45 | # status 1 and both stdout and stderr were empty, then assume it's a working
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| 46 | # regex that avoids the internal stack overflow problem like glibc's regexp
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| 47 | # used to.
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| 48 | test $st = 1 \
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| 49 | && ! test -s out \
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| 50 | && ! test -s err \
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| 51 | && Exit 0
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| 52 |
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| 53 | fail_ 'grep never printed "stack overflow"'
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