13 files changed, 386 insertions, 9 deletions
diff --git a/user/alsa-lib/APKBUILD b/user/alsa-lib/APKBUILD
index 49f14066e..7cdf1108e 100644
--- a/user/alsa-lib/APKBUILD
+++ b/user/alsa-lib/APKBUILD
@@ -1,6 +1,6 @@
 # Maintainer: A. Wilcox <awilfox@adelielinux.org>
 pkgname=alsa-lib
-pkgver=1.2.2
+pkgver=1.2.4
 pkgrel=0
 pkgdesc="Linux sound support system"
 url="https://www.alsa-project.org/wiki/Main_Page"
@@ -13,6 +13,7 @@ source="ftp://ftp.alsa-project.org/pub/lib/$pkgname-$pkgver.tar.bz2
 	ucm_add_limits_h.patch
 	remove-test.patch
 	type_compat.patch
+	dlmisc_c.patch
 	"
 
 build() {
@@ -43,7 +44,8 @@ package() {
 	make -j1 DESTDIR="$pkgdir" install
 }
 
-sha512sums="d21adb3ff998918c7d1820f9ce2aaf4202dd45ccb87cb092d49da8b2402b6ddaad06325be0fd59f17393a5d9958e3743bfccb4b14bdb947a42e7d791d73c7033  alsa-lib-1.2.2.tar.bz2
+sha512sums="12086952dc8f16f1cb6946517858e17b1c3276aeda9ff5703a84bb38aa78eb4c4e9cb4485c5b3f21f174fdbd976b3bcbbc481e85cb2460652858490df51ae844  alsa-lib-1.2.4.tar.bz2
 3b37652d50809443b5f8e80f8d447108195b0cd66fd917805bb393fc091584b6f3dad4414f568742b61745617e7a695862058a0a0f93dcc31e4c97177a520352  ucm_add_limits_h.patch
 0ce3c2b8a0a70e2dffb6d633b95c4aae74504cd694fe1507cbc409d931b5f733935b22de45e4adcf5a507587c9f80c60a6f0e798aac2ca2fbf0cbcdef0080079  remove-test.patch
-bdcfa3d5fcc055fb6732922679e21689fc2ac19462fe7b72d16862c98ef8c995c3dd5becc4987ba417068e6b0e561bec7e6284d5f0a414e2966c8e00ac304fa8  type_compat.patch"
+bdcfa3d5fcc055fb6732922679e21689fc2ac19462fe7b72d16862c98ef8c995c3dd5becc4987ba417068e6b0e561bec7e6284d5f0a414e2966c8e00ac304fa8  type_compat.patch
+cfb008272df3f08fc9a3fcd086b199b3d7e88663cb60806aa67b01aea62cbd98bd63e468a34b66f0f18520e4a5bab0ac6db33aef58316f7ba329abfab0ebedee  dlmisc_c.patch"
diff --git a/user/alsa-lib/dlmisc_c.patch b/user/alsa-lib/dlmisc_c.patch
new file mode 100644
index 000000000..b88dd3c29
--- /dev/null
+++ b/user/alsa-lib/dlmisc_c.patch
@@ -0,0 +1,29 @@
+From ad8c8e5503980295dd8e5e54a6285d2d7e32eb1e Mon Sep 17 00:00:00 2001
+From: Jaroslav Kysela <perex@perex.cz>
+Date: Thu, 22 Oct 2020 20:57:32 +0200
+Subject: [PATCH] dlmisc: the snd_plugin_dir_set / snd_plugin_dir must be
+ declared even for \!DL_ORIGIN_AVAILABLE
+
+Fixes: 8580c081c2 ("dlsym: add support for ALSA_PLUGIN_DIR environment variable")
+BugLink: https://github.com/alsa-project/alsa-lib/issues/91
+Signed-off-by: Jaroslav Kysela <perex@perex.cz>
+---
+ src/dlmisc.c | 2 --
+ 1 file changed, 2 deletions(-)
+
+diff --git a/src/dlmisc.c b/src/dlmisc.c
+index c9517c55..f20eb593 100644
+--- a/src/dlmisc.c
++++ b/src/dlmisc.c
+@@ -42,11 +42,9 @@
+ #ifndef PIC
+ struct snd_dlsym_link *snd_dlsym_start = NULL;
+ #endif
+-#ifdef DL_ORIGIN_AVAILABLE
+ static int snd_plugin_dir_set = 0;
+ static char *snd_plugin_dir = NULL;
+ #endif
+-#endif
+ 
+ #if defined(DL_ORIGIN_AVAILABLE) && defined(HAVE_LIBPTHREAD)
+ static pthread_mutex_t snd_dlpath_mutex = PTHREAD_MUTEX_INITIALIZER;
diff --git a/user/alsa-utils/APKBUILD b/user/alsa-utils/APKBUILD
index 569e8d6a4..cab801ab0 100644
--- a/user/alsa-utils/APKBUILD
+++ b/user/alsa-utils/APKBUILD
@@ -1,7 +1,7 @@
 # Contributor: Leonardo Arena <rnalrd@alpinelinux.org>
 # Maintainer: Max Rees <maxcrees@me.com>
 pkgname=alsa-utils
-pkgver=1.2.2
+pkgver=1.2.4
 pkgrel=0
 pkgdesc="Advanced Linux Sound Architecture (ALSA) utilities"
 url="https://www.alsa-project.org/wiki/Main_Page"
@@ -36,7 +36,7 @@ package() {
 	install -Dm644 ../alsa.confd "$pkgdir"/etc/conf.d/alsa
 }
 
-sha512sums="30598c658f3f2ad71a5ce7911b09ae13add54b293bcf3bebb053371d84a91528bd64fd376f167456b2e27e2546a2279019678e099247513e5142b283af756fd9  alsa-utils-1.2.2.tar.bz2
+sha512sums="13080abda55269513b3751044dac292d695e273073a62d74ed4a32c68f448a2b015fe16604650821a6398b6ef6a7b6008cb9f0b7fb7f4ee1fa2b4eb2dcf29770  alsa-utils-1.2.4.tar.bz2
 817215be6e9f103a8a187df5b1142c4d2e952f547a64579a9b8cfa58bd762d6a55bde75c0f66f018c0597744d07ccdb08216f7b368db464e36667cecedcc00f3  alsaconf.patch
 7bf743024d7c5caed2fbf8af5cee73bcc569a7bab0bd6459541d3704cc6a7456d588b600b690e7406e122deaf0316dd1f67219a267bec4dff3f6c0f120edaae4  alsa.initd
 6e716e6230fd3d2c33e3cb2dbf572d632c9ac6452c1768388bea7d3ca22f7c72cf6bcd702580f45cb9089983582011c8b04cbdb4420d14fb988167b1391ea547  alsa.confd"
diff --git a/user/genext2fs/APKBUILD b/user/genext2fs/APKBUILD
new file mode 100644
index 000000000..ac59e8e22
--- /dev/null
+++ b/user/genext2fs/APKBUILD
@@ -0,0 +1,36 @@
+# Contributor: Nathan <ndowens@artixlinux.org>
+# Maintainer: Nathan <ndowens@artixlinux.org>
+pkgname=genext2fs
+pkgver=1.5.0
+pkgrel=0
+pkgdesc="ext2 filesystem generator for embedded systems"
+url="https://github.com/bestouff/genext2fs"
+arch="all"
+license="GPL-2.0+"
+depends=""
+makedepends="autoconf automake libarchive-dev"
+subpackages="$pkgname-doc"
+source=""$pkgname-$pkgver.tar.gz::https://github.com/bestouff/genext2fs/archive/v$pkgver.tar.gz
+
+prepare() {
+	NOCONFIGURE=1 ./autogen.sh
+}
+
+build() {
+	./configure \
+		--build=$CBUILD \
+		--host=$CHOST \
+		--prefix=/usr \
+		--enable-libarchive
+	make
+}
+
+check() {
+	make check
+}
+
+package() {
+	make DESTDIR="$pkgdir" install
+}
+
+sha512sums="628994f4f5f6d534a42e16db5322e36addb227d0e0ee589ebebbbb6beda9c53774186a932d04fcb978fde1cbe534b8335fdbfea256aecd2d873c03bc5892a8ce  genext2fs-1.5.0.tar.gz"
diff --git a/user/giblib/APKBUILD b/user/giblib/APKBUILD
index 85f255925..9754a38df 100644
--- a/user/giblib/APKBUILD
+++ b/user/giblib/APKBUILD
@@ -1,16 +1,15 @@
-# Maintainer: 
+# Maintainer: Nathan <ndowens@artixlinux.org>
 pkgname=giblib
 pkgver=1.2.4
-pkgrel=11
+pkgrel=12
 pkgdesc="Graphics library built atop Imlib2"
 url="http://linuxbrit.co.uk/details.html"
 arch="all"
 license="MIT-feh"
-subpackages="$pkgname-doc $pkgname-dev"
 depends=""
 depends_dev="freetype-dev imlib2-dev libx11-dev libxext-dev zlib-dev"
 makedepends="$depends_dev"
-subpackages="$pkgname-doc"
+subpackages="$pkgname-doc $pkgname-dev"
 source="http://distfiles.gentoo.org/distfiles/$pkgname-$pkgver.tar.gz"
 
 prepare() {
diff --git a/user/gnu-netcat/APKBUILD b/user/gnu-netcat/APKBUILD
new file mode 100644
index 000000000..d6a02a122
--- /dev/null
+++ b/user/gnu-netcat/APKBUILD
@@ -0,0 +1,32 @@
+# Contributor: Nathan <ndowens@artixlinux.org>
+# Maintainer: Nathan <ndowens@artixlinux.org>
+pkgname=gnu-netcat
+pkgver=0.7.1
+pkgrel=0
+pkgdesc="GNU rewrite of netcat"
+url="http://netcat.sourceforge.net" # No HTTPS
+arch="all"
+license="GPL-2.0+"
+depends=""
+makedepends="texinfo"
+subpackages="$pkgname-doc"
+source="https://downloads.sourceforge.net/sourceforge/netcat/netcat-$pkgver.tar.bz2"
+builddir="$srcdir/netcat-$pkgver"
+
+build() {
+	./configure \
+		--prefix=/usr \
+		--mandir=/usr/share/man \
+		--infodir=/usr/share/info
+	make
+}
+
+check() {
+	make check
+}
+
+package() {
+	make DESTDIR="$pkgdir" install
+}
+
+sha512sums="283c02f849c3bb62615a5ccb7796192804dafcecb34f3c6b553cbc12c715654963b81e253762923c6069be9768b93dde576a392b89b167912c323354f1376e83  netcat-0.7.1.tar.bz2"
diff --git a/user/libseccomp/APKBUILD b/user/libseccomp/APKBUILD
new file mode 100644
index 000000000..3a26c908a
--- /dev/null
+++ b/user/libseccomp/APKBUILD
@@ -0,0 +1,46 @@
+# Maintainer: Nathan <ndowens@artixlinux.org>
+# Contributor: Natanael Copa <ncopa@alpinelinux.org>
+# Contributor: Carlo Landmeter <clandmeter@gmail.com>
+# Contributor: Dan Williams <dan@ma.ssive.co>
+pkgname=libseccomp
+pkgver=2.5.0
+pkgrel=0
+pkgdesc="An interface to the Linux Kernel's syscall filtering mechanism"
+url="https://github.com/seccomp/libseccomp"
+arch="all"
+license="LGPL-2.1+"
+depends=""
+makedepends="linux-headers gperf"
+checkdepends="bash cmd:which"
+subpackages="$pkgname-dev $pkgname-doc"
+source="https://github.com/seccomp/libseccomp/releases/download/v$pkgver/libseccomp-$pkgver.tar.gz
+	remove-redefinition-prctl.patch
+	"
+
+# secfixes:
+#   2.4.0-r0:
+#     - CVE-2019-9893
+
+build() {
+	./configure \
+		--build=$CBUILD \
+		--host=$CHOST \
+		--prefix=/usr \
+		--sysconfdir=/etc \
+		--mandir=/usr/share/man \
+		--infodir=/usr/share/info \
+		--enable-static \
+		--localstatedir=/var
+	make
+}
+
+check() {
+	make check
+}
+
+package() {
+	make DESTDIR="$pkgdir" install
+}
+
+sha512sums="00ef5aeb4db8dafb546ae680b2d6d9b6aeed008df805d0f28f9dd15c074ff6ea7a5e5131ab503825b8011c59aa23046baedd5849ca040aa73352f43ab2d602ae  libseccomp-2.5.0.tar.gz
+f2c31dcafdc9a1ad78e32e76b75e1c1603071eaa3f979e1f2483b879a34ad07e0a4ef3642196a695415cdf81e1ed2bf325175872fb4e203ef9d0e668c287493f  remove-redefinition-prctl.patch"
diff --git a/user/libseccomp/remove-redefinition-prctl.patch b/user/libseccomp/remove-redefinition-prctl.patch
new file mode 100644
index 000000000..2ea88fe05
--- /dev/null
+++ b/user/libseccomp/remove-redefinition-prctl.patch
@@ -0,0 +1,10 @@
+--- ./src/system.c.orig
++++ ./src/system.c
+@@ -21,7 +21,6 @@
+ 
+ #include <stdlib.h>
+ #include <errno.h>
+-#include <sys/prctl.h>
+ 
+ #include <seccomp.h>
+ 
diff --git a/user/olm/APKBUILD b/user/olm/APKBUILD
new file mode 100644
index 000000000..fd4e86072
--- /dev/null
+++ b/user/olm/APKBUILD
@@ -0,0 +1,39 @@
+# Contributor: Dan Theisen <djt@hxx.in>
+# Maintainer: Dan Theisen <djt@hxx.in>
+pkgname=olm
+pkgver=3.2.1
+pkgrel=0
+pkgdesc="Implementation of the olm and megolm cryptographic ratchets"
+url="https://gitlab.matrix.org/matrix-org/olm/"
+arch="all"
+license="Apache-2.0"
+depends=""
+makedepends=""
+subpackages="$pkgname-dev"
+source="https://gitlab.matrix.org/matrix-org/olm/-/archive/$pkgver/olm-$pkgver.tar.bz2"
+
+build() {
+	if [ "$CBUILD" != "$CHOST" ]; then
+		CMAKE_CROSSOPTS="-DCMAKE_SYSTEM_NAME=Linux -DCMAKE_HOST_SYSTEM_NAME=Linux"
+	fi
+	cmake \
+		-DCMAKE_INSTALL_PREFIX=/usr \
+		-DCMAKE_INSTALL_LIBDIR=lib \
+		-DBUILD_SHARED_LIBS=True \
+		-DCMAKE_BUILD_TYPE=RelWithDebugInfo \
+		-DCMAKE_CXX_FLAGS="$CXXFLAGS" \
+		-DCMAKE_C_FLAGS="$CFLAGS" \
+		${CMAKE_CROSSOPTS} \
+		.
+	make
+}
+
+check() {
+	CTEST_OUTPUT_ON_FAILURE=TRUE ctest
+}
+
+package() {
+	make DESTDIR="$pkgdir" install
+}
+
+sha512sums="adb9cff6148d19df4b83a287723219d4da9efd162f7a2824bee63d824d22c20a10fd2c2d8ce74aff5ec006c6dc8828bd6851cc82be93bc6c4524cf7067080412  olm-3.2.1.tar.bz2"
diff --git a/user/vorbis-tools/APKBUILD b/user/vorbis-tools/APKBUILD
new file mode 100644
index 000000000..410eda1ff
--- /dev/null
+++ b/user/vorbis-tools/APKBUILD
@@ -0,0 +1,37 @@
+# Contributor: Nathan <ndowens@artixlinux.org>
+# Maintainer: Nathan <ndowens@artixlinux.org>
+pkgname=vorbis-tools
+pkgver=1.4.0
+pkgrel=0
+pkgdesc="Tools for Ogg-Vorbis"
+url="https://www.xiph.org/vorbis"
+arch="all"
+license="GPL-2.0+"
+depends=""
+makedepends="curl-dev flac-dev libvorbis-dev
+	    libao-dev speex-dev"
+subpackages="$pkgname-lang $pkgname-doc"
+source="http://downloads.xiph.org/releases/vorbis/vorbis-tools-$pkgver.tar.gz
+	vorbis-tools-CVE-2015-6749.patch
+	vorbis-tools-cve9638-cve9639.patch
+	vorbis-tools-cve9640.patch"
+
+build() {
+	./configure \
+		--prefix=/usr \
+		--enable-vcut
+	make
+}
+
+check() {
+	make check
+}
+
+package() {
+	make DESTDIR="$pkgdir" install
+}
+
+sha512sums="d2473f2e8e6726b5a5083f567797ae42bbb7fa3f26aec3f7b83e641e028c64726299f71a9d75258595a53cf29c18acb84841bcbc39509258d2c8df859e4e3b99  vorbis-tools-1.4.0.tar.gz
+c1faa062e7035770db533383ebb3ae18efaf167f7a103c12cef81418da4be43545e368eab2915c243c03354c3bf0b8dbb198da90e7eaa59c8e00f1461c65b601  vorbis-tools-CVE-2015-6749.patch
+bcf5ae147de547f6463f3000e06398a8b4db326b44eab02bf314ca8ae3b90c45bd25481fb76ccbf39d9a2798a6c9fadb48600f393b6436f01f95ce2a20c04fe8  vorbis-tools-cve9638-cve9639.patch
+3bb8a50309f2657a99662039818040abf345d540915543cf35c3e5855d865fd33bf4bbaf296882662e6b11570199a054c7d34cfdd44ef69f9d3c9f45f4d8671f  vorbis-tools-cve9640.patch"
diff --git a/user/vorbis-tools/vorbis-tools-CVE-2015-6749.patch b/user/vorbis-tools/vorbis-tools-CVE-2015-6749.patch
new file mode 100644
index 000000000..78e3c810e
--- /dev/null
+++ b/user/vorbis-tools/vorbis-tools-CVE-2015-6749.patch
@@ -0,0 +1,41 @@
+From 04815d3e1bfae3a6cdfb2c25358a5a72b61299f7 Mon Sep 17 00:00:00 2001
+From: Mark Harris <mark.hsj@gmail.com>
+Date: Sun, 30 Aug 2015 05:54:46 -0700
+Subject: [PATCH] oggenc: Fix large alloca on bad AIFF input
+
+Fixes #2212
+---
+ oggenc/audio.c | 10 +++++-----
+ 1 file changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/oggenc/audio.c b/oggenc/audio.c
+index 477da8c..4921fb9 100644
+--- a/oggenc/audio.c
++++ b/oggenc/audio.c
+@@ -245,8 +245,8 @@ static int aiff_permute_matrix[6][6] =
+ int aiff_open(FILE *in, oe_enc_opt *opt, unsigned char *buf, int buflen)
+ {
+     int aifc; /* AIFC or AIFF? */
+-    unsigned int len;
+-    unsigned char *buffer;
++    unsigned int len, readlen;
++    unsigned char buffer[22];
+     unsigned char buf2[8];
+     aiff_fmt format;
+     aifffile *aiff = malloc(sizeof(aifffile));
+@@ -269,9 +269,9 @@ int aiff_open(FILE *in, oe_enc_opt *opt, unsigned char *buf, int buflen)
+         return 0; /* Weird common chunk */
+     }
+ 
+-    buffer = alloca(len);
+-
+-    if(fread(buffer,1,len,in) < len)
++    readlen = len < sizeof(buffer) ? len : sizeof(buffer);
++    if(fread(buffer,1,readlen,in) < readlen ||
++       (len > readlen && !seek_forward(in, len-readlen)))
+     {
+         fprintf(stderr, _("Warning: Unexpected EOF in reading AIFF header\n"));
+         return 0;
+-- 
+2.5.0
+
diff --git a/user/vorbis-tools/vorbis-tools-cve9638-cve9639.patch b/user/vorbis-tools/vorbis-tools-cve9638-cve9639.patch
new file mode 100644
index 000000000..80238b741
--- /dev/null
+++ b/user/vorbis-tools/vorbis-tools-cve9638-cve9639.patch
@@ -0,0 +1,77 @@
+... in order to prevent a division by zero (CVE-2014-9638) and integer
+overflow (CVE-2014-9639).
+
+Bug: https://trac.xiph.org/ticket/2136
+Bug: https://trac.xiph.org/ticket/2137
+---
+ oggenc/audio.c | 19 +++++++++++++++++--
+ 1 file changed, 17 insertions(+), 2 deletions(-)
+
+diff --git a/oggenc/audio.c b/oggenc/audio.c
+index 477da8c..1167f1b 100644
+--- a/oggenc/audio.c
++++ b/oggenc/audio.c
+@@ -13,6 +13,7 @@
+ #include <config.h>
+ #endif
+ 
++#include <limits.h>
+ #include <stdlib.h>
+ #include <stdio.h>
+ #include <string.h>
+@@ -251,6 +252,7 @@ int aiff_open(FILE *in, oe_enc_opt *opt, unsigned char *buf, int buflen)
+     aiff_fmt format;
+     aifffile *aiff = malloc(sizeof(aifffile));
+     int i;
++    long channels;
+ 
+     if(buf[11]=='C')
+         aifc=1;
+@@ -277,11 +279,17 @@ int aiff_open(FILE *in, oe_enc_opt *opt, unsigned char *buf, int buflen)
+         return 0;
+     }
+ 
+-    format.channels = READ_U16_BE(buffer);
++    format.channels = channels = READ_U16_BE(buffer);
+     format.totalframes = READ_U32_BE(buffer+2);
+     format.samplesize = READ_U16_BE(buffer+6);
+     format.rate = (int)read_IEEE80(buffer+8);
+ 
++    if(channels <= 0L || SHRT_MAX < channels)
++    {
++        fprintf(stderr, _("Warning: Unsupported count of channels in AIFF header\n"));
++        return 0;
++    }
++
+     aiff->bigendian = 1;
+ 
+     if(aifc)
+@@ -416,6 +424,7 @@ int wav_open(FILE *in, oe_enc_opt *opt, unsigned char *oldbuf, int buflen)
+     wav_fmt format;
+     wavfile *wav = malloc(sizeof(wavfile));
+     int i;
++    long channels;
+ 
+     /* Ok. At this point, we know we have a WAV file. Now we have to detect
+      * whether we support the subtype, and we have to find the actual data
+@@ -453,12 +462,18 @@ int wav_open(FILE *in, oe_enc_opt *opt, unsigned char *oldbuf, int buflen)
+     }
+ 
+     format.format =      READ_U16_LE(buf);
+-    format.channels =    READ_U16_LE(buf+2);
++    format.channels = channels = READ_U16_LE(buf+2);
+     format.samplerate =  READ_U32_LE(buf+4);
+     format.bytespersec = READ_U32_LE(buf+8);
+     format.align =       READ_U16_LE(buf+12);
+     format.samplesize =  READ_U16_LE(buf+14);
+ 
++    if(channels <= 0L || SHRT_MAX < channels)
++    {
++        fprintf(stderr, _("Warning: Unsupported count of channels in WAV header\n"));
++        return 0;
++    }
++
+     if(format.format == -2) /* WAVE_FORMAT_EXTENSIBLE */
+     {
+       if(len<40)
+-- 
diff --git a/user/vorbis-tools/vorbis-tools-cve9640.patch b/user/vorbis-tools/vorbis-tools-cve9640.patch
new file mode 100644
index 000000000..97d18e0db
--- /dev/null
+++ b/user/vorbis-tools/vorbis-tools-cve9640.patch
@@ -0,0 +1,29 @@
+Index: vorbis-tools/oggenc/oggenc.c
+===================================================================
+--- vorbis-tools/oggenc/oggenc.c	(revision 19116)
++++ vorbis-tools/oggenc/oggenc.c	(revision 19117)
+@@ -98,4 +98,6 @@
+               0,0,0.f,
+               0, 0, 0, 0, 0};
++    input_format raw_format = {NULL, 0, raw_open, wav_close, "raw", 
++      N_("RAW file reader")};
+ 
+     int i;
+@@ -240,6 +242,4 @@
+         if(opt.rawmode)
+         {
+-            input_format raw_format = {NULL, 0, raw_open, wav_close, "raw", 
+-                N_("RAW file reader")};
+ 
+             enc_opts.rate=opt.raw_samplerate;
+Index: vorbis-tools/oggenc/skeleton.h
+===================================================================
+--- vorbis-tools/oggenc/skeleton.h	(revision 19116)
++++ vorbis-tools/oggenc/skeleton.h	(revision 19117)
+@@ -42,5 +42,5 @@
+     ogg_int64_t start_granule;                             /* start granule value */
+     ogg_uint32_t preroll;                                   /* preroll */
+-    unsigned char granule_shift; // a 8-bit field           /* 1 byte value holding the granule shift */
++    unsigned char granule_shift;                            /* 1 byte value holding the granule shift */
+     char *message_header_fields;                            /* holds all the message header fields */
+     /* current total size of the message header fields, for realloc purpose, initially zero */