Fix mbstate_t initialization in POSIX::mblen
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Petr Písař
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d959a0725c
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From 37f30deca415d6c2606bf088e09f978134b9e2e1 Mon Sep 17 00:00:00 2001
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From: Niko Tyni <ntyni@debian.org>
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Date: Sun, 10 Mar 2019 19:40:42 +0200
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Subject: [PATCH] Fix POSIX::mblen mbstate_t initialization on threaded perls
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with glibc
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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As reported in https://bugs.launchpad.net/bugs/1818953 POSIX::mblen()
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is broken on threaded perls with glibc.
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% perl -MPOSIX=mblen -e 'mblen("a", 1)'
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perl: mbrtowc.c:105: __mbrtowc: Assertion `__mbsinit (data.__statep)' failed.
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zsh: abort (core dumped) perl -MPOSIX=mblen -e 'mblen("a", 1)'
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This broke in v5.27.8-134-g6c9ff7e96e which made the function
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use mbrlen(3) under the hood on threaded perls.
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The problem is initialization of the shift state with
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mbrlen(NULL, 0, &ps));
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The glibc documentation for mbrlen(3) at
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https://www.gnu.org/software/libc/manual/html_node/Converting-a-Character.html#Converting-a-Character
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does not mention initialization by passing in a null pointer for the
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string, only a pointer to a NUL wide character.
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If the next multibyte character corresponds to the NUL wide character,
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the return value is 0. If the next n bytes form a valid multibyte
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character, the number of bytes belonging to this multibyte character
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byte sequence is returned.
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Use memset(3) instead for mbstate_t initialization, as suggested in
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https://www.gnu.org/software/libc/manual/html_node/Keeping-the-state.html
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with the hope that this is more portable.
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While at it, add a few basic test cases. These are in a new file because
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they need fresh_perl_is() from test.pl while the existing ones use
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Test::More (and conversion of at least posix.t looks way too involved.)
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Bug-Ubuntu: https://bugs.launchpad.net/bugs/1818953
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Petr Písař: Ported to 5.28.1 from
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25d7b7aa379d33ce2e8fe3e2bef4206b35739bc5.
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Signed-off-by: Petr Písař <ppisar@redhat.com>
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---
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MANIFEST | 1 +
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ext/POSIX/POSIX.xs | 2 +-
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ext/POSIX/t/mb.t | 47 ++++++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 49 insertions(+), 1 deletion(-)
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create mode 100644 ext/POSIX/t/mb.t
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diff --git a/MANIFEST b/MANIFEST
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index 9fbbe9a..e4e63c3 100644
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--- a/MANIFEST
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+++ b/MANIFEST
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@@ -4204,6 +4204,7 @@ ext/POSIX/POSIX.xs POSIX extension external subroutines
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ext/POSIX/t/export.t Test @EXPORT and @EXPORT_OK
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ext/POSIX/t/iscrash See if POSIX isxxx() crashes with threads on Win32
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ext/POSIX/t/math.t Basic math tests for POSIX
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+ext/POSIX/t/mb.t Multibyte function tests for POSIX
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ext/POSIX/t/posix.t See if POSIX works
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ext/POSIX/t/sigaction.t See if POSIX::sigaction works
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ext/POSIX/t/sigset.t See if POSIX::SigSet works
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diff --git a/ext/POSIX/POSIX.xs b/ext/POSIX/POSIX.xs
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index 7497305..395025a 100644
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--- a/ext/POSIX/POSIX.xs
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+++ b/ext/POSIX/POSIX.xs
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@@ -3318,7 +3318,7 @@ mblen(s, n)
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#endif
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CODE:
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#if defined(USE_ITHREADS) && defined(HAS_MBRLEN)
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- PERL_UNUSED_RESULT(mbrlen(NULL, 0, &ps)); /* Initialize state */
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+ memset(&ps, 0, sizeof(ps)); /* Initialize state */
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RETVAL = mbrlen(s, n, &ps); /* Prefer reentrant version */
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#else
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RETVAL = mblen(s, n);
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diff --git a/ext/POSIX/t/mb.t b/ext/POSIX/t/mb.t
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new file mode 100644
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index 0000000..961edf6
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--- /dev/null
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+++ b/ext/POSIX/t/mb.t
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@@ -0,0 +1,47 @@
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+#!./perl
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+
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+# These tests are in a separate file, because they use fresh_perl_is()
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+# from test.pl.
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+
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+# The mb* functions use the "underlying locale" that is not affected by
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+# the Perl one. So we run the tests in a separate "fresh_perl" process
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+# with the correct LC_CTYPE set in the environment.
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+
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+BEGIN {
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+ require Config; import Config;
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+ if ($^O ne 'VMS' and $Config{'extensions'} !~ /\bPOSIX\b/) {
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+ print "1..0\n";
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+ exit 0;
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+ }
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+ unshift @INC, "../../t";
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+ require 'loc_tools.pl';
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+ require 'test.pl';
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+}
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+
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+plan tests => 3;
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+
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+use POSIX qw();
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+
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+SKIP: {
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+ skip("mblen() not present", 3) unless $Config{d_mblen};
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+
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+ is(&POSIX::mblen("a", &POSIX::MB_CUR_MAX), 1, 'mblen() basically works');
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+
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+ skip("LC_CTYPE locale support not available", 2)
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+ unless locales_enabled('LC_CTYPE');
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+
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+ my $utf8_locale = find_utf8_ctype_locale();
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+ skip("no utf8 locale available", 2) unless $utf8_locale;
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+
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+ local $ENV{LC_CTYPE} = $utf8_locale;
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+ local $ENV{LC_ALL};
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+ delete $ENV{LC_ALL};
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+
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+ fresh_perl_is(
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+ 'use POSIX; print &POSIX::mblen("\x{c3}\x{28}", &POSIX::MB_CUR_MAX)',
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+ -1, {}, 'mblen() recognizes invalid multibyte characters');
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+
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+ fresh_perl_is(
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+ 'use POSIX; print &POSIX::mblen("\N{GREEK SMALL LETTER SIGMA}", &POSIX::MB_CUR_MAX)',
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+ 2, {}, 'mblen() works on UTF-8 characters');
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+}
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--
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2.20.1
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@ -272,6 +272,10 @@ Patch58: perl-5.29.8-handle-scope-error-in-qr.patch
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# character name, RT#133880, in upstream after 5.29.9
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Patch59: perl-5.28.1-PATCH-perl-133880-assertion-failure.patch
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# Fix mbstate_t initialization in POSIX::mblen, RT#133928,
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# in upstream after 5.29.9
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Patch60: perl-5.28.1-Fix-POSIX-mblen-mbstate_t-initialization-on-threaded.patch
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# Link XS modules to libperl.so with EU::CBuilder on Linux, bug #960048
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Patch200: perl-5.16.3-Link-XS-modules-to-libperl.so-with-EU-CBuilder-on-Li.patch
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@ -2887,6 +2891,7 @@ Perl extension for Version Objects
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%patch57 -p1
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%patch58 -p1
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%patch59 -p1
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%patch60 -p1
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%patch200 -p1
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%patch201 -p1
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@ -2938,6 +2943,7 @@ perl -x patchlevel.h \
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'Fedora Patch56: Fix a leak when compiling a typed hash dereference' \
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'Fedora Patch58: Fix a buffer overread when handling a scope error in qr/\(?{/ (RT#133879)' \
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'Fedora Patch59: Fix a buffer overread when parsing a regular expression with an unknown character name (RT#133880)' \
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'Fedora Patch60: Fix mbstate_t initialization in POSIX::mblen (RT#133928)' \
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'Fedora Patch200: Link XS modules to libperl.so with EU::CBuilder on Linux' \
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'Fedora Patch201: Link XS modules to libperl.so with EU::MM on Linux' \
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%{nil}
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@ -5231,6 +5237,7 @@ popd
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- Fix a buffer overread when handling a scope error in qr/\(?{/ (RT#133879)
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- Fix a buffer overread when parsing a regular expression with an unknown
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character name (RT#133880)
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- Fix mbstate_t initialization in POSIX::mblen (RT#133928)
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* Tue Mar 05 2019 Björn Esser <besser82@fedoraproject.org> - 4:5.28.1-434
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- Add explicit Requires: libxcrypt-devel to devel sub-package (bug #1666098)
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