Branch: refs/heads/yves/eval_begin_nest_depth
Home: https://github.com/Perl/perl5
Commit: 7f845d088284cf66333ed710c623b15ccd43a46d
https://github.com/Perl/perl5/commit/7f845d088284cf66333ed710c623b15ccd43a46d
Author: Yves Orton <demer...@gmail.com>
Date: 2022-08-28 (Sun, 28 Aug 2022)
Changed paths:
M INSTALL
M embedvar.h
M intrpvar.h
M op.c
M perl.h
M pod/perldelta.pod
M pod/perldiag.pod
M pod/perlfunc.pod
M pod/perlvar.pod
M sv.c
M t/op/eval.t
Log Message:
-----------
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
