app-arch/pigz: backport memcpy UB fix

Signed-off-by: Sam James <sam@gentoo.org>

2 files changed, 64 insertions, 0 deletions

diff --git a/app-arch/pigz/files/pigz-2.7-memcpy-ub.patch b/app-arch/pigz/files/pigz-2.7-memcpy-ub.patch
new file mode 100644
index 000000000000..db53660748b4
--- /dev/null
+++ b/app-arch/pigz/files/pigz-2.7-memcpy-ub.patch
@@ -0,0 +1,26 @@
+https://github.com/madler/pigz/commit/e1ed230a1599a3cb64c8f5c003cced60e10e3314
+https://github.com/madler/pigz/issues/107
+
+From e1ed230a1599a3cb64c8f5c003cced60e10e3314 Mon Sep 17 00:00:00 2001
+From: Mark Adler <madler@alumni.caltech.edu>
+Date: Sat, 31 Dec 2022 21:28:26 -0800
+Subject: [PATCH] Avoid calling memcpy() with a NULL pointer.
+
+This is not permitted by the C99 standard even when the length is
+zero. Go figure.
+--- a/pigz.c
++++ b/pigz.c
+@@ -3414,8 +3414,10 @@ local int outb(void *desc, unsigned char *buf, unsigned len) {
+ 
+         // copy the output and alert the worker bees
+         out_len = len;
+-        g.out_tot += len;
+-        memcpy(out_copy, buf, len);
++        if (len) {
++            g.out_tot += len;
++            memcpy(out_copy, buf, len);
++        }
+         twist(outb_write_more, TO, 1);
+         twist(outb_check_more, TO, 1);
+ 
+
diff --git a/app-arch/pigz/pigz-2.7-r1.ebuild b/app-arch/pigz/pigz-2.7-r1.ebuild
new file mode 100644
index 000000000000..f0a9d1f4540f
--- /dev/null
+++ b/app-arch/pigz/pigz-2.7-r1.ebuild
@@ -0,0 +1,38 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit toolchain-funcs flag-o-matic
+
+DESCRIPTION="A parallel implementation of gzip"
+HOMEPAGE="https://www.zlib.net/pigz/"
+SRC_URI="https://www.zlib.net/pigz/${P}.tar.gz"
+
+LICENSE="ZLIB"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~ppc-macos ~sparc64-solaris"
+IUSE="static test"
+RESTRICT="!test? ( test )"
+
+LIB_DEPEND="sys-libs/zlib[static-libs(+)]"
+RDEPEND="!static? ( ${LIB_DEPEND//\[static-libs(+)]} )"
+DEPEND="${RDEPEND}
+	static? ( ${LIB_DEPEND} )
+	test? ( app-arch/ncompress )"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-memcpy-ub.patch
+)
+
+src_compile() {
+	use static && append-ldflags -static
+	emake CC="$(tc-getCC)" CFLAGS="${CFLAGS}" LDFLAGS="${LDFLAGS}"
+}
+
+src_install() {
+	dobin ${PN}
+	dosym ${PN} /usr/bin/un${PN}
+	dodoc README
+	doman ${PN}.1
+}