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| author | Yves Orton <demerphq@gmail.com> | 2022-08-28 12:09:51 +0200 |
|---|---|---|
| committer | Yves Orton <demerphq@gmail.com> | 2022-09-02 10:05:42 +0200 |
| commit | 741a5c7396a0ca90a22ea8d8e0761c70c14b0a77 (patch) | |
| tree | 0c442705b8ff90ebda90515e6c601ab6784af8fb /intrpvar.h | |
| parent | cd55125d69f5f698ef7cbdd650cda7d2e59fc388 (diff) | |
| download | perl-741a5c7396a0ca90a22ea8d8e0761c70c14b0a77.tar.gz | |
op.c - Restrict nested eval/BEGIN blocks to a user controllable maximum
Nested BEGIN blocks can cause us to segfault by exhausting
the C stack. Eg:
perl -le'sub f { eval "BEGIN { f() }" } f()'
will segfault. This adds a new interpreter var PL_eval_begin_nest_depth
to keep track of how many layer of eval/BEGIN we have seen, and a new
reserved variable called ${^MAX_NESTED_EVAL_BEGIN_BLOCKS} which can be
used to raise or lower the limit. When set to 0 it blocks BEGIN entirely,
which might be useful from time to time.
This fixes https://github.com/Perl/perl5/issues/20176
Diffstat (limited to 'intrpvar.h')
| -rw-r--r-- | intrpvar.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/intrpvar.h b/intrpvar.h index fe20baad97..fc3914b1b0 100644 --- a/intrpvar.h +++ b/intrpvar.h @@ -787,6 +787,8 @@ PERLVARI(I, phase, enum perl_phase, PERL_PHASE_CONSTRUCT) PERLVARI(I, in_load_module, bool, FALSE) /* to prevent recursions in PerlIO_find_layer */ +PERLVARI(I, eval_begin_nest_depth, U32, 0) + PERLVAR(I, unsafe, bool) PERLVAR(I, colorset, bool) /* PERL_RE_COLORS env var is in use */ |