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populating localized %SIG breaks aliasing stack #15188

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p5pRT opened this issue Feb 18, 2016 · 3 comments
Open

populating localized %SIG breaks aliasing stack #15188

p5pRT opened this issue Feb 18, 2016 · 3 comments
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distro-Linux type-core

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@p5pRT
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p5pRT commented Feb 18, 2016

Migrated from rt.perl.org#127559 (status was 'open')

Searchable as RT127559$
@p5pRT
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p5pRT commented Feb 18, 2016

From gm@qwurx.de

Created by shmem@qwurx.de

Sometimes a localized %SIG isn't restored properly. Consider​:

----8<----
local $SIG{__WARN__} = sub { warn "outer​: $_[0]" };
warn "one\n";
{
  local $SIG{__WARN__} = sub { print "inner 1​: $_[0]" };
  warn "two\n";
  {
  local %SIG;
  warn "three\n";
  local $SIG{__WARN__} = sub { warn "inner 2​: $_[0]" };
  warn "four\n";
  }
  warn "five\n";
}
warn "six\n";
__END__
outer​: one
inner 1​: two
inner 1​: three
inner 2​: four
five
outer​: six
----8<----

Line 5 should be "inner 1​: five". Likewise​:

----8<----
local $SIG{__WARN__} = sub { warn "outer​: $_[0]" };
warn "one\n";
{
  local $SIG{__WARN__} = sub { print "inner 1​: $_[0]" };
  warn "two\n";
  {
  local %SIG;
  warn "three\n";
  $SIG{__WARN__} = sub { warn "inner 2​: $_[0]" };
  warn "four\n";
  }
  warn "five\n";
}
warn "six\n";
__END__
outer​: one
inner 1​: two
inner 1​: three
inner 2​: four
inner 2​: five
outer​: six
----8<----

This happens only if the complete %SIG is localized.

Perl Info 

Flags:
     category=core
     severity=low

Site configuration information for perl 5.18.2:

Configured by Debian Project at Thu Mar 27 18:28:21 UTC 2014.

Summary of my perl5 (revision 5 version 18 subversion 2) configuration:

   Platform:
     osname=linux, osvers=3.2.0-58-generic, archname=x86_64-linux-gnu-thread-multi
     uname='linux brownie 3.2.0-58-generic #88-ubuntu smp tue dec 3 17:37:58 utc 2013 x86_64 x86_64 x86_64 gnulinux '
     config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Dldflags= -Wl,-Bsymbolic-functions -Wl,-z,relro -Dlddlflags=-shared -Wl,-Bsymbolic-functions -Wl,-z,relro -Dcccdlflags=-fPIC -Darchname=x86_64-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.18 -Darchlib=/usr/lib/perl/5.18 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.18.2 -Dsitearch=/usr/local/lib/perl/5.18.2 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Duse64bitint -Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Ud_ualarm -Uusesfio -Uusenm -Ui_libutil -Uversiononly -DDEBUGGING=-g -Doptimize=-O2 -Duseshrplib -Dlibperl=libperl.so.5.18.2 -des'
     hint=recommended, useposix=true, d_sigaction=define
     useithreads=define, usemultiplicity=define
     useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
     use64bitint=define, use64bitall=define, uselongdouble=undef
     usemymalloc=n, bincompat5005=undef
   Compiler:
     cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fstack-protector -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
     optimize='-O2 -g',
     cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fstack-protector -fno-strict-aliasing -pipe -I/usr/local/include'
     ccversion='', gccversion='4.8.2', gccosandvers=''
     intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
     d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
     ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
     alignbytes=8, prototype=define
   Linker and Libraries:
     ld='cc', ldflags =' -fstack-protector -L/usr/local/lib'
     libpth=/usr/local/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib /usr/lib
     libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
     perllibs=-ldl -lm -lpthread -lc -lcrypt
     libc=, so=so, useshrplib=true, libperl=libperl.so.5.18.2
     gnulibc_version='2.19'
   Dynamic Linking:
     dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
     cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib -fstack-protector'

Locally applied patches:
     DEBPKG:debian/cpan_definstalldirs - Provide a sensible INSTALLDIRS default for modules installed from CPAN.
     DEBPKG:debian/db_file_ver - http://bugs.debian.org/340047 Remove overly restrictive DB_File version check.
     DEBPKG:debian/doc_info - Replace generic man(1) instructions with Debian-specific information.
     DEBPKG:debian/enc2xs_inc - http://bugs.debian.org/290336 Tweak enc2xs to follow symlinks and ignore missing @INC directories.
     DEBPKG:debian/errno_ver - http://bugs.debian.org/343351 Remove Errno version check due to upgrade problems with long-running processes.
     DEBPKG:debian/libperl_embed_doc - http://bugs.debian.org/186778 Note that libperl-dev package is required for embedded linking
     DEBPKG:fixes/respect_umask - Respect umask during installation
     DEBPKG:debian/writable_site_dirs - Set umask approproately for site install directories
     DEBPKG:debian/extutils_set_libperl_path - EU:MM: Set location of libperl.a to /usr/lib
     DEBPKG:debian/no_packlist_perllocal - Don't install .packlist or perllocal.pod for perl or vendor
     DEBPKG:debian/prefix_changes - Fiddle with *PREFIX and variables written to the makefile
     DEBPKG:debian/fakeroot - Postpone LD_LIBRARY_PATH evaluation to the binary targets.
     DEBPKG:debian/instmodsh_doc - Debian policy doesn't install .packlist files for core or vendor.
     DEBPKG:debian/ld_run_path - Remove standard libs from LD_RUN_PATH as per Debian policy.
     DEBPKG:debian/libnet_config_path - Set location of libnet.cfg to /etc/perl/Net as /usr may not be writable.
     DEBPKG:debian/mod_paths - Tweak @INC ordering for Debian
     DEBPKG:debian/module_build_man_extensions - http://bugs.debian.org/479460 Adjust Module::Build manual page extensions for the Debian Perl policy
     DEBPKG:debian/prune_libs - http://bugs.debian.org/128355 Prune the list of libraries wanted to what we actually need.
     DEBPKG:fixes/net_smtp_docs - [rt.cpan.org #36038] http://bugs.debian.org/100195 Document the Net::SMTP 'Port' option
     DEBPKG:debian/perlivp - http://bugs.debian.org/510895 Make perlivp skip include directories in /usr/local
     DEBPKG:debian/cpanplus_definstalldirs - http://bugs.debian.org/533707 Configure CPANPLUS to use the site directories by default.
     DEBPKG:debian/cpanplus_config_path - Save local versions of CPANPLUS::Config::System into /etc/perl.
     DEBPKG:debian/deprecate-with-apt - http://bugs.debian.org/702096 Point users to Debian packages of deprecated core modules
     DEBPKG:debian/squelch-locale-warnings - http://bugs.debian.org/508764 Squelch locale warnings in Debian package maintainer scripts
     DEBPKG:debian/skip-upstream-git-tests - Skip tests specific to the upstream Git repository
     DEBPKG:debian/patchlevel - http://bugs.debian.org/567489 List packaged patches for 5.18.2-2ubuntu1 in patchlevel.h
     DEBPKG:debian/skip-kfreebsd-crash - http://bugs.debian.org/628493 [perl #96272] Skip a crashing test case in t/op/threads.t on GNU/kFreeBSD
     DEBPKG:fixes/document_makemaker_ccflags - http://bugs.debian.org/628522 [rt.cpan.org #68613] Document that CCFLAGS should include $Config{ccflags}
     DEBPKG:debian/find_html2text - http://bugs.debian.org/640479 Configure CPAN::Distribution with correct name of html2text
     DEBPKG:debian/hurd_test_skip_stack - http://bugs.debian.org/650175 Disable failing GNU/Hurd tests dist/threads/t/stack.t
     DEBPKG:fixes/manpage_name_Test-Harness - http://bugs.debian.org/650451 [rt.cpan.org #73399] cpan/Test-Harness: add NAME headings in modules with POD
     DEBPKG:debian/makemaker-pasthru - http://bugs.debian.org/660195 [rt.cpan.org #28632] Make EU::MM pass LD through to recursive Makefile.PL invocations
     DEBPKG:debian/perl5db-x-terminal-emulator.patch - http://bugs.debian.org/668490 Invoke x-terminal-emulator rather than xterm in perl5db.pl
     DEBPKG:debian/cpan-missing-site-dirs - http://bugs.debian.org/688842 Fix CPAN::FirstTime defaults with nonexisting site dirs if a parent is writable
     DEBPKG:fixes/memoize_storable_nstore - [rt.cpan.org #77790] http://bugs.debian.org/587650 Memoize::Storable: respect 'nstore' option not respected
     DEBPKG:fixes/net_ftp_failed_command - [rt.cpan.org #37700] http://bugs.debian.org/491062 Net::FTP: cope gracefully with a failed command
     DEBPKG:fixes/perlbug-patchlist - [3541c11] http://bugs.debian.org/710842 [perl #118433] Make perlbug look up the list of local patches at run time
     DEBPKG:fixes/module_metadata_security_doc - [68cdd4b] CVE-2013-1437 documentation fix
     DEBPKG:fixes/module_metadata_taint_fix - [bff978f] http://bugs.debian.org/722210 [rt.cpan.org #88576] untaint version, if needed, in Module::Metadata
     DEBPKG:fixes/IPC-SysV-spelling - http://bugs.debian.org/730558 [rt.cpan.org #86736] Fix spelling of IPC_CREAT in IPC-SysV documentation
     DEBPKG:fixes/fix-undef-source -


@INC for perl 5.18.2:
     /home/shmem/comp/perl/lib
     /etc/perl
     /usr/local/lib/perl/5.18.2
     /usr/local/share/perl/5.18.2
     /usr/lib/perl5
     /usr/share/perl5
     /usr/lib/perl/5.18
     /usr/share/perl/5.18
     /usr/local/lib/site_perl
     .


Environment for perl 5.18.2:
     HOME=/home/shmem
     LANG=en_GB.UTF-8
     LANGUAGE=
     LC_ADDRESS=de_DE.UTF-8
     LC_IDENTIFICATION=de_DE.UTF-8
     LC_MEASUREMENT=de_DE.UTF-8
     LC_MONETARY=de_DE.UTF-8
     LC_NAME=de_DE.UTF-8
     LC_NUMERIC=de_DE.UTF-8
     LC_PAPER=de_DE.UTF-8
     LC_TELEPHONE=de_DE.UTF-8
     LC_TIME=de_DE.UTF-8
     LD_LIBRARY_PATH (unset)
     LOGDIR (unset)
     PATH=/home/shmem/bin:/sbin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:.
     PERL5LIB=/home/shmem/comp/perl/lib
     PERL_BADLANG (unset)
     SHELL=/bin/bash

@p5pRT
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p5pRT commented Apr 29, 2016

From @jimc

restating what OP reported,

bug in 1st example is fixed if either -
local %SIG before warn "three" is removed
local keyword on
$SIG{__warn__} = sub{}.
before warn "four" is DE-localized ("local" removed)

@p5pRT
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p5pRT commented Apr 29, 2016

The RT System itself - Status changed from 'new' to 'open'

@xenu xenu removed the affects-5.18 label Nov 19, 2021
@xenu xenu removed the Severity Low label Dec 29, 2021
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