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bignum upgrade/downgrade path bug #16369

p5pRT opened this issue Jan 18, 2018 · 5 comments

bignum upgrade/downgrade path bug #16369

p5pRT opened this issue Jan 18, 2018 · 5 comments


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@p5pRT p5pRT commented Jan 18, 2018

Migrated from (status was 'rejected')

Searchable as RT132739$

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@p5pRT p5pRT commented Jan 18, 2018


This is a bug report for perl from gabriel.withington@​,
generated with the help of perlbug 1.40 running under perl 5.22.1.

Two integers ($a and $b) passed to a subroutine and then with the operation
$a % $b performed on them produces the following error​:

Can't use an undefined value as an ARRAY reference at
/usr/share/perl/5.22/Math/BigInt/ line 1359.

I've attached a script which demonstrates the problem, it is fixed by
adding an int() cast to lines 173 and 174.


P.S. The script might be of interest generally. It takes a semiprime and an
encryption exponent, the two components of an RSA public key, and
calculates an exponent which can be used to decrypt data for that key
(well, for the cipher text used). It's an interesting approach which skips
semiprimes and looks like the lower limit of time as a function of key
length may be linear. It's all very exciting and so far my efforts have
been pooh-pooh-ed by Bruce Schneier and Niels Ferguson.


Site configuration information for perl 5.22.1​:

Configured by Debian Project at Fri Nov 10 14​:39​:06 UTC 2017.

Summary of my perl5 (revision 5 version 22 subversion 1) configuration​:

  osname=linux, osvers=3.16.0, archname=x86_64-linux-gnu-thread-multi
  uname='linux localhost 3.16.0 #1 smp debian 3.16.0 x86_64 gnulinux '
  config_args='-Dusethreads -Duselargefiles -Dcc=x86_64-linux-gnu-gcc
-Dcpp=x86_64-linux-gnu-cpp -Dld=x86_64-linux-gnu-gcc -Dccflags=-DDEBIAN
-Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector-strong -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
-Darchlib=/usr/lib/x86_64-linux-gnu/perl/5.22 -Dvendorprefix=/usr
-Dvendorarch=/usr/lib/x86_64-linux-gnu/perl5/5.22 -Dsiteprefix=/usr/local
-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 -dEs -Duseshrplib'
  hint=recommended, useposix=true, d_sigaction=define
  useithreads=define, usemultiplicity=define
  use64bitint=define, use64bitall=define, uselongdouble=undef
  usemymalloc=n, bincompat5005=undef
  cc='x86_64-linux-gnu-gcc', ccflags ='-D_REENTRANT -D_GNU_SOURCE
-DDEBIAN -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include
  optimize='-O2 -g',
  cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fwrapv
-fno-strict-aliasing -pipe -I/usr/local/include'
  ccversion='', gccversion='5.4.0 20160609', 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',
  alignbytes=8, prototype=define
  Linker and Libraries​:
  ld='x86_64-linux-gnu-gcc', ldflags =' -fstack-protector-strong
  libpth=/usr/local/lib /usr/lib/gcc/x86_64-linux-gnu/5/include-fixed
/usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib/../lib
/usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib
  libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
  perllibs=-ldl -lm -lpthread -lc -lcrypt, so=so, useshrplib=true,
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
  cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib

Locally applied patches​:
  DEBPKG​:debian/cpan_definstalldirs - Provide a sensible INSTALLDIRS
default for modules installed from CPAN.
  DEBPKG​:debian/db_file_ver - http​:// 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​:// Tweak enc2xs
to follow symlinks and ignore missing @​INC directories.
  DEBPKG​:debian/errno_ver - http​:// Remove Errno
version check due to upgrade problems with long-running processes.
  DEBPKG​:debian/libperl_embed_doc - http​:// 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 under /usr/lib
  DEBPKG​:debian/no_packlist_perllocal - Don't install .packlist or
perllocal.pod for perl or vendor
  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/prune_libs - http​:// Prune the list
of libraries wanted to what we actually need.
  DEBPKG​:fixes/net_smtp_docs - [ #36038]
http​:// Document the Net​::SMTP 'Port' option
  DEBPKG​:debian/perlivp - http​:// Make perlivp skip
include directories in /usr/local
  DEBPKG​:debian/deprecate-with-apt - http​:// Point
users to Debian packages of deprecated core modules
  DEBPKG​:debian/squelch-locale-warnings - http​://
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​:// List packaged
patches for 5.22.1-9ubuntu0.2 in patchlevel.h
  DEBPKG​:debian/skip-kfreebsd-crash - http​:// [perl
#96272] Skip a crashing test case in t/op/threads.t on GNU/kFreeBSD
  DEBPKG​:fixes/document_makemaker_ccflags - http​://
[ #68613] Document that CCFLAGS should include $Config{ccflags}
  DEBPKG​:debian/find_html2text - http​:// Configure
CPAN​::Distribution with correct name of html2text
  DEBPKG​:debian/perl5db-x-terminal-emulator.patch -
http​:// Invoke x-terminal-emulator rather than xterm
  DEBPKG​:debian/cpan-missing-site-dirs - http​://
Fix CPAN​::FirstTime defaults with nonexisting site dirs if a parent is
  DEBPKG​:fixes/memoize_storable_nstore - [ #77790]
http​:// Memoize​::Storable​: respect 'nstore' option
not respected
  DEBPKG​:debian/regen-skip - Skip a regeneration check in unrelated git
  DEBPKG​:debian/makemaker-pasthru - http​:// Pass LD
settings through to subdirectories
  DEBPKG​:fixes/pod_man_reproducible_date - http​://
Support POD_MAN_DATE in Pod​::Man for the left-hand footer
  DEBPKG​:debian/locale-robustness - http​:// [perl
#124310] Make t/run/locale.t survive missing locales masked by LC_ALL
  DEBPKG​:fixes/podman-utc - http​:// Make the
embedded date from Pod​::Man reproducible
  DEBPKG​:fixes/podman-utc-docs - http​://
Documentation and test suite updates for UTC fix
  DEBPKG​:fixes/podman-empty-date - http​:// Support
an empty POD_MAN_DATE environment variable
  DEBPKG​:fixes/podman-pipe - http​:// Better errors
for man pages from standard input
  DEBPKG​:debian/pod2man-customized - Update porting/customized.dat for
pod2man modifications
  DEBPKG​:debian/makemaker-manext - http​:// Make
EU​::MakeMaker honour MANnEXT settings in generated manpage headers
  DEBPKG​:debian/makemaker_customized - Update t/porting/customized.dat
for files patched in Debian
  DEBPKG​:debian/do-not-record-build-date - [6baa8db]
http​:// [perl #125830] Allow overriding the compile
time in "perl -V" output
  DEBPKG​:fixes/podman-source-date-epoch - http​://
Make Pod​::Man honor the SOURCE_DATE_EPOCH environment variable
  DEBPKG​:fixes/podman-source-date-epoch-cleanups -
http​:// Coding style and documentation for
  DEBPKG​:fixes/podman-source-date-epoch-testfix -
http​:// Guard for building with SOURCE_DATE_EPOCH or
  DEBPKG​:debian/devel-ppport-reproducibility -
http​:// Sort the list of XS code files when
generating RealPPPort.xs
  DEBPKG​:fixes/encode-unicode-bom - http​:// [ #107043] Address
  DEBPKG​:debian/encode-unicode-bom-doc - http​://
Document Debian backport of Encode​::Unicode fix
  DEBPKG​:debian/kfreebsd-softupdates - http​:// Work
around Debian Bug#796798
  DEBPKG​:fixes/autodie-scope - http​:// Fix a
scoping issue with "no autodie" and the "system" sub
  DEBPKG​:debian/debugperl-compat-fix - [perl #127212]
http​:// Disable PERL_TRACK_MEMPOOL for debugging
  DEBPKG​:fixes/CVE-2015-8607_file_spec_taint_fix -
http​:// [perl #126862] ensure File​::Spec​::canonpath()
preserves taint
  DEBPKG​:fixes/mkstemp-umask - http​:// [perl
#127322] [e57270b] Fix umask for mkstemp(3) calls
  DEBPKG​:fixes/crosscompile-no-targethost - [perl #127234] Fix the
Configure escape with usecrosscompile but no targethost
  DEBPKG​:fixes/podlators-no-encode - [ #111156] Degrade
gracefully if utf8 is requested but Encode is not available
  DEBPKG​:debian/cross-time-hires - [ #111391] Add an
environment variable to skip running configuration probes
  DEBPKG​:fixes/encode-unicode-pod -​: Fix POD error
  DEBPKG​:fixes/memoize-pod - [ #89441] Fix POD errors in
  DEBPKG​:fixes/ok-pod - Added encoding for pod.
  DEBPKG​:fixes/CVE-2016-2381_duplicate_env - remove duplicate environment
variables from environ
  DEBPKG​:fixes/CVE-2017-12837.patch - [PATCH] regcomp [perl #131582]
  DEBPKG​:fixes/CVE-2017-12883.patch - [PATCH] PATCH​: [perl #131598]

@​INC for perl 5.22.1​:

Environment for perl 5.22.1​:
  LOGDIR (unset)

  PERL_BADLANG (unset)

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@p5pRT p5pRT commented Jan 18, 2018

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@p5pRT p5pRT commented Jan 21, 2018

From @pjacklam

I would be grateful if you logged this ticket here (as mentioned in the "bignum" documentation)​:

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@p5pRT p5pRT commented Jan 21, 2018

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

@p5pRT p5pRT closed this as completed Jan 22, 2018
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@p5pRT p5pRT commented Jan 22, 2018

@iabyn - Status changed from 'open' to 'rejected'

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