app-emulation/qemu: fix static-user dep, security patches, bug #593038

This commit resolves

  bug #591202
  bug #593024
  bug #593034 CVE-2016-7155
  bug #593036 CVE-2016-7156
  bug #593038 CVE-2016-7157

Package-Manager: portage-2.2.28

5 files changed, 882 insertions, 0 deletions

diff --git a/app-emulation/qemu/files/qemu-2.7.0-CVE-2016-7155.patch b/app-emulation/qemu/files/qemu-2.7.0-CVE-2016-7155.patch
new file mode 100644
index 000000000000..495faf2f1cbe
--- /dev/null
+++ b/app-emulation/qemu/files/qemu-2.7.0-CVE-2016-7155.patch
@@ -0,0 +1,81 @@
+From: Prasad J Pandit <address@hidden>
+
+Vmware Paravirtual SCSI emulation uses command descriptors to
+process SCSI commands. These descriptors come with their ring
+buffers. A guest could set the page count for these rings to
+an arbitrary value, leading to infinite loop or OOB access.
+Add check to avoid it.
+
+Reported-by: Tom Victor <address@hidden>
+Reported-by: Li Qiang <address@hidden>
+Signed-off-by: Prasad J Pandit <address@hidden>
+---
+ hw/scsi/vmw_pvscsi.c | 21 ++++++++++-----------
+ 1 file changed, 10 insertions(+), 11 deletions(-)
+
+Update per review
+  -> https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg00019.html
+
+diff --git a/hw/scsi/vmw_pvscsi.c b/hw/scsi/vmw_pvscsi.c
+index 5116f4a..4245c15 100644
+--- a/hw/scsi/vmw_pvscsi.c
++++ b/hw/scsi/vmw_pvscsi.c
+@@ -152,7 +152,7 @@ pvscsi_log2(uint32_t input)
+     return log;
+ }
+ 
+-static int
++static void
+ pvscsi_ring_init_data(PVSCSIRingInfo *m, PVSCSICmdDescSetupRings *ri)
+ {
+     int i;
+@@ -160,10 +160,6 @@ pvscsi_ring_init_data(PVSCSIRingInfo *m, PVSCSICmdDescSetupRings *ri)
+     uint32_t req_ring_size, cmp_ring_size;
+     m->rs_pa = ri->ringsStatePPN << VMW_PAGE_SHIFT;
+ 
+-    if ((ri->reqRingNumPages > PVSCSI_SETUP_RINGS_MAX_NUM_PAGES)
+-        || (ri->cmpRingNumPages > PVSCSI_SETUP_RINGS_MAX_NUM_PAGES)) {
+-        return -1;
+-    }
+     req_ring_size = ri->reqRingNumPages * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
+     cmp_ring_size = ri->cmpRingNumPages * PVSCSI_MAX_NUM_CMP_ENTRIES_PER_PAGE;
+     txr_len_log2 = pvscsi_log2(req_ring_size - 1);
+@@ -195,8 +191,6 @@ pvscsi_ring_init_data(PVSCSIRingInfo *m, PVSCSICmdDescSetupRings *ri)
+ 
+     /* Flush ring state page changes */
+     smp_wmb();
+-
+-    return 0;
+ }
+ 
+ static int
+@@ -746,7 +740,7 @@ pvscsi_dbg_dump_tx_rings_config(PVSCSICmdDescSetupRings *rc)
+ 
+     trace_pvscsi_tx_rings_num_pages("Confirm Ring", rc->cmpRingNumPages);
+     for (i = 0; i < rc->cmpRingNumPages; i++) {
+-        trace_pvscsi_tx_rings_ppn("Confirm Ring", rc->reqRingPPNs[i]);
++        trace_pvscsi_tx_rings_ppn("Confirm Ring", rc->cmpRingPPNs[i]);
+     }
+ }
+ 
+@@ -779,10 +773,15 @@ pvscsi_on_cmd_setup_rings(PVSCSIState *s)
+ 
+     trace_pvscsi_on_cmd_arrived("PVSCSI_CMD_SETUP_RINGS");
+ 
++    if (!rc->reqRingNumPages
++        || rc->reqRingNumPages > PVSCSI_SETUP_RINGS_MAX_NUM_PAGES
++        || !rc->cmpRingNumPages
++        || rc->cmpRingNumPages > PVSCSI_SETUP_RINGS_MAX_NUM_PAGES) {
++        return PVSCSI_COMMAND_PROCESSING_FAILED;
++    }
++
+     pvscsi_dbg_dump_tx_rings_config(rc);
+-    if (pvscsi_ring_init_data(&s->rings, rc) < 0) {
+-        return PVSCSI_COMMAND_PROCESSING_FAILED;
+-    }
++    pvscsi_ring_init_data(&s->rings, rc);
+ 
+     s->rings_info_valid = TRUE;
+     return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
+-- 
+2.5.5
diff --git a/app-emulation/qemu/files/qemu-2.7.0-CVE-2016-7156.patch b/app-emulation/qemu/files/qemu-2.7.0-CVE-2016-7156.patch
new file mode 100644
index 000000000000..9c21a6759ad1
--- /dev/null
+++ b/app-emulation/qemu/files/qemu-2.7.0-CVE-2016-7156.patch
@@ -0,0 +1,62 @@
+From: Prasad J Pandit <address@hidden>
+
+In PVSCSI paravirtual SCSI bus, pvscsi_convert_sglist can take a very
+long time or go into an infinite loop due to two different bugs:
+
+1) the request descriptor data length is defined to be 64 bit. While
+building SG list from a request descriptor, it gets truncated to 32bit
+in routine 'pvscsi_convert_sglist'. This could lead to an infinite loop
+situation for large 'dataLen' values, when data_length is cast to uint32_t
+and chunk_size becomes always zero.  Fix this by removing the incorrect
+cast.
+
+2) pvscsi_get_next_sg_elem can be called arbitrarily many times if the
+element has a zero length.  Get out of the loop early when this happens,
+by introducing an upper limit on the number of SG list elements.
+
+Reported-by: Li Qiang <address@hidden>
+Signed-off-by: Prasad J Pandit <address@hidden>
+---
+ hw/scsi/vmw_pvscsi.c | 11 ++++++-----
+ 1 file changed, 6 insertions(+), 5 deletions(-)
+
+Update as per:
+  -> https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg01172.html
+
+diff --git a/hw/scsi/vmw_pvscsi.c b/hw/scsi/vmw_pvscsi.c
+index 4245c15..babac5a 100644
+--- a/hw/scsi/vmw_pvscsi.c
++++ b/hw/scsi/vmw_pvscsi.c
+@@ -40,6 +40,8 @@
+ #define PVSCSI_MAX_DEVS                   (64)
+ #define PVSCSI_MSIX_NUM_VECTORS           (1)
+ 
++#define PVSCSI_MAX_SG_ELEM                2048
++
+ #define PVSCSI_MAX_CMD_DATA_WORDS \
+     (sizeof(PVSCSICmdDescSetupRings)/sizeof(uint32_t))
+ 
+@@ -628,17 +630,16 @@ pvscsi_queue_pending_descriptor(PVSCSIState *s, SCSIDevice **d,
+ static void
+ pvscsi_convert_sglist(PVSCSIRequest *r)
+ {
+-    int chunk_size;
++    uint32_t chunk_size, elmcnt = 0;
+     uint64_t data_length = r->req.dataLen;
+     PVSCSISGState sg = r->sg;
+-    while (data_length) {
+-        while (!sg.resid) {
++    while (data_length && elmcnt < PVSCSI_MAX_SG_ELEM) {
++        while (!sg.resid && elmcnt++ < PVSCSI_MAX_SG_ELEM) {
+             pvscsi_get_next_sg_elem(&sg);
+             trace_pvscsi_convert_sglist(r->req.context, r->sg.dataAddr,
+                                         r->sg.resid);
+         }
+-        assert(data_length > 0);
+-        chunk_size = MIN((unsigned) data_length, sg.resid);
++        chunk_size = MIN(data_length, sg.resid);
+         if (chunk_size) {
+             qemu_sglist_add(&r->sgl, sg.dataAddr, chunk_size);
+         }
+-- 
+2.5.5
diff --git a/app-emulation/qemu/files/qemu-2.7.0-CVE-2016-7157-1.patch b/app-emulation/qemu/files/qemu-2.7.0-CVE-2016-7157-1.patch
new file mode 100644
index 000000000000..480de308e0ac
--- /dev/null
+++ b/app-emulation/qemu/files/qemu-2.7.0-CVE-2016-7157-1.patch
@@ -0,0 +1,28 @@
+From: Prasad J Pandit <address@hidden>
+
+When LSI SAS1068 Host Bus emulator builds configuration page
+headers, the format string used in 'mptsas_config_manufacturing_1'
+was wrong. It could lead to an invalid memory access.
+
+Reported-by: Tom Victor <address@hidden>
+Fix-suggested-by: Paolo Bonzini <address@hidden>
+Signed-off-by: Prasad J Pandit <address@hidden>
+---
+ hw/scsi/mptconfig.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/hw/scsi/mptconfig.c b/hw/scsi/mptconfig.c
+index 7071854..1ec895b 100644
+--- a/hw/scsi/mptconfig.c
++++ b/hw/scsi/mptconfig.c
+@@ -203,7 +203,7 @@ size_t mptsas_config_manufacturing_1(MPTSASState *s, uint8_t **data, int address
+ {
+     /* VPD - all zeros */
+     return MPTSAS_CONFIG_PACK(1, MPI_CONFIG_PAGETYPE_MANUFACTURING, 0x00,
+-                              "s256");
++                              "*s256");
+ }
+ 
+ static
+-- 
+2.5.5
diff --git a/app-emulation/qemu/files/qemu-2.7.0-CVE-2016-7157-2.patch b/app-emulation/qemu/files/qemu-2.7.0-CVE-2016-7157-2.patch
new file mode 100644
index 000000000000..5e796086ae08
--- /dev/null
+++ b/app-emulation/qemu/files/qemu-2.7.0-CVE-2016-7157-2.patch
@@ -0,0 +1,27 @@
+From: Prasad J Pandit <address@hidden>
+
+When LSI SAS1068 Host Bus emulator builds configuration page
+headers, mptsas_config_pack() asserts to check returned size
+value is within limit of 256 bytes. Fix that assert expression.
+
+Suggested-by: Paolo Bonzini <address@hidden>
+Signed-off-by: Prasad J Pandit <address@hidden>
+---
+ hw/scsi/mptconfig.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/hw/scsi/mptconfig.c b/hw/scsi/mptconfig.c
+index 1ec895b..531947f 100644
+--- a/hw/scsi/mptconfig.c
++++ b/hw/scsi/mptconfig.c
+@@ -158,7 +158,7 @@ static size_t mptsas_config_pack(uint8_t **data, const char *fmt, ...)
+     va_end(ap);
+ 
+     if (data) {
+-        assert(ret < 256 && (ret % 4) == 0);
++        assert(ret / 4 < 256);
+         stb_p(*data + 1, ret / 4);
+     }
+     return ret;
+-- 
+2.5.5
diff --git a/app-emulation/qemu/qemu-2.7.0-r1.ebuild b/app-emulation/qemu/qemu-2.7.0-r1.ebuild
new file mode 100644
index 000000000000..c75b7b6bc05c
--- /dev/null
+++ b/app-emulation/qemu/qemu-2.7.0-r1.ebuild
@@ -0,0 +1,684 @@
+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI="5"
+
+PYTHON_COMPAT=( python2_7 )
+PYTHON_REQ_USE="ncurses,readline"
+
+PLOCALES="bg de_DE fr_FR hu it tr zh_CN"
+
+inherit eutils flag-o-matic linux-info toolchain-funcs multilib python-r1 \
+	user udev fcaps readme.gentoo pax-utils l10n
+
+if [[ ${PV} = *9999* ]]; then
+	EGIT_REPO_URI="git://git.qemu.org/qemu.git"
+	inherit git-2
+	SRC_URI=""
+else
+	SRC_URI="http://wiki.qemu-project.org/download/${P}.tar.bz2"
+	KEYWORDS="~amd64 ~arm64 ~ppc ~ppc64 ~x86 ~x86-fbsd"
+fi
+
+DESCRIPTION="QEMU + Kernel-based Virtual Machine userland tools"
+HOMEPAGE="http://www.qemu.org http://www.linux-kvm.org"
+
+LICENSE="GPL-2 LGPL-2 BSD-2"
+SLOT="0"
+IUSE="accessibility +aio alsa bluetooth bzip2 +caps +curl debug +fdt glusterfs \
+gnutls gtk gtk2 infiniband iscsi +jpeg \
+kernel_linux kernel_FreeBSD lzo ncurses nfs nls numa opengl +pin-upstream-blobs
++png pulseaudio python \
+rbd sasl +seccomp sdl sdl2 selinux smartcard snappy spice ssh static static-softmmu
+static-user systemtap tci test +threads usb usbredir +uuid vde +vhost-net \
+virgl virtfs +vnc vte xattr xen xfs"
+
+COMMON_TARGETS="aarch64 alpha arm cris i386 m68k microblaze microblazeel mips
+mips64 mips64el mipsel or32 ppc ppc64 s390x sh4 sh4eb sparc sparc64 unicore32
+x86_64"
+IUSE_SOFTMMU_TARGETS="${COMMON_TARGETS} lm32 moxie ppcemb tricore xtensa xtensaeb"
+IUSE_USER_TARGETS="${COMMON_TARGETS} armeb mipsn32 mipsn32el ppc64abi32 ppc64le sparc32plus tilegx"
+
+use_softmmu_targets=$(printf ' qemu_softmmu_targets_%s' ${IUSE_SOFTMMU_TARGETS})
+use_user_targets=$(printf ' qemu_user_targets_%s' ${IUSE_USER_TARGETS})
+IUSE+=" ${use_softmmu_targets} ${use_user_targets}"
+
+# Allow no targets to be built so that people can get a tools-only build.
+# Block USE flag configurations known to not work.
+REQUIRED_USE="${PYTHON_REQUIRED_USE}
+	gtk2? ( gtk )
+	qemu_softmmu_targets_arm? ( fdt )
+	qemu_softmmu_targets_microblaze? ( fdt )
+	qemu_softmmu_targets_ppc? ( fdt )
+	qemu_softmmu_targets_ppc64? ( fdt )
+	sdl2? ( sdl )
+	static? ( static-softmmu static-user )
+	static-softmmu? ( !alsa !pulseaudio !bluetooth !opengl !gtk !gtk2 )
+	virtfs? ( xattr )
+	vte? ( gtk )"
+
+# Yep, you need both libcap and libcap-ng since virtfs only uses libcap.
+#
+# The attr lib isn't always linked in (although the USE flag is always
+# respected).  This is because qemu supports using the C library's API
+# when available rather than always using the extranl library.
+#
+# Older versions of gnutls are supported, but it's simpler to just require
+# the latest versions.  This is also why we require nettle.
+#
+# TODO: Split out tools deps into another var.  e.g. bzip2 is only used by
+# system binaries and tools, not user binaries.
+COMMON_LIB_DEPEND=">=dev-libs/glib-2.0[static-libs(+)]
+	dev-libs/libpcre[static-libs(+)]
+	sys-libs/zlib[static-libs(+)]
+	bzip2? ( app-arch/bzip2[static-libs(+)] )
+	xattr? ( sys-apps/attr[static-libs(+)] )"
+SOFTMMU_LIB_DEPEND="${COMMON_LIB_DEPEND}
+	>=x11-libs/pixman-0.28.0[static-libs(+)]
+	accessibility? ( app-accessibility/brltty[static-libs(+)] )
+	aio? ( dev-libs/libaio[static-libs(+)] )
+	alsa? ( >=media-libs/alsa-lib-1.0.13 )
+	bluetooth? ( net-wireless/bluez )
+	caps? ( sys-libs/libcap-ng[static-libs(+)] )
+	curl? ( >=net-misc/curl-7.15.4[static-libs(+)] )
+	fdt? ( >=sys-apps/dtc-1.4.0[static-libs(+)] )
+	glusterfs? ( >=sys-cluster/glusterfs-3.4.0[static-libs(+)] )
+	gnutls? (
+		dev-libs/nettle:=[static-libs(+)]
+		>=net-libs/gnutls-3.0:=[static-libs(+)]
+	)
+	gtk? (
+		gtk2? (
+			x11-libs/gtk+:2
+			vte? ( x11-libs/vte:0 )
+		)
+		!gtk2? (
+			x11-libs/gtk+:3
+			vte? ( x11-libs/vte:2.90 )
+		)
+	)
+	infiniband? ( sys-fabric/librdmacm:=[static-libs(+)] )
+	iscsi? ( net-libs/libiscsi )
+	jpeg? ( virtual/jpeg:0=[static-libs(+)] )
+	lzo? ( dev-libs/lzo:2[static-libs(+)] )
+	ncurses? ( sys-libs/ncurses:0=[static-libs(+)] )
+	nfs? ( >=net-fs/libnfs-1.9.3[static-libs(+)] )
+	numa? ( sys-process/numactl[static-libs(+)] )
+	opengl? (
+		virtual/opengl
+		media-libs/libepoxy[static-libs(+)]
+		media-libs/mesa[static-libs(+)]
+		media-libs/mesa[egl,gles2]
+	)
+	png? ( media-libs/libpng:0=[static-libs(+)] )
+	pulseaudio? ( media-sound/pulseaudio )
+	rbd? ( sys-cluster/ceph[static-libs(+)] )
+	sasl? ( dev-libs/cyrus-sasl[static-libs(+)] )
+	sdl? (
+		!sdl2? (
+			media-libs/libsdl[X]
+			>=media-libs/libsdl-1.2.11[static-libs(+)]
+		)
+		sdl2? (
+			media-libs/libsdl2[X]
+			media-libs/libsdl2[static-libs(+)]
+		)
+	)
+	seccomp? ( >=sys-libs/libseccomp-2.1.0[static-libs(+)] )
+	smartcard? ( >=app-emulation/libcacard-2.5.0[static-libs(+)] )
+	snappy? ( app-arch/snappy[static-libs(+)] )
+	spice? (
+		>=app-emulation/spice-protocol-0.12.3
+		>=app-emulation/spice-0.12.0[static-libs(+)]
+	)
+	ssh? ( >=net-libs/libssh2-1.2.8[static-libs(+)] )
+	usb? ( >=virtual/libusb-1-r2[static-libs(+)] )
+	usbredir? ( >=sys-apps/usbredir-0.6[static-libs(+)] )
+	uuid? ( >=sys-apps/util-linux-2.16.0[static-libs(+)] )
+	vde? ( net-misc/vde[static-libs(+)] )
+	virgl? ( media-libs/virglrenderer[static-libs(+)] )
+	virtfs? ( sys-libs/libcap )
+	xfs? ( sys-fs/xfsprogs[static-libs(+)] )"
+USER_LIB_DEPEND="${COMMON_LIB_DEPEND}"
+X86_FIRMWARE_DEPEND="
+	>=sys-firmware/ipxe-1.0.0_p20130624
+	pin-upstream-blobs? (
+		~sys-firmware/seabios-1.8.2
+		~sys-firmware/sgabios-0.1_pre8
+		~sys-firmware/vgabios-0.7a
+	)
+	!pin-upstream-blobs? (
+		sys-firmware/seabios
+		sys-firmware/sgabios
+		sys-firmware/vgabios
+	)"
+CDEPEND="
+	!static-softmmu? ( $(printf "%s? ( ${SOFTMMU_LIB_DEPEND//\[static-libs(+)]} ) " ${use_softmmu_targets}) )
+	!static-user? ( $(printf "%s? ( ${USER_LIB_DEPEND//\[static-libs(+)]} ) " ${use_user_targets}) )
+	qemu_softmmu_targets_i386? ( ${X86_FIRMWARE_DEPEND} )
+	qemu_softmmu_targets_x86_64? ( ${X86_FIRMWARE_DEPEND} )
+	python? ( ${PYTHON_DEPS} )
+	systemtap? ( dev-util/systemtap )
+	xen? ( app-emulation/xen-tools:= )"
+DEPEND="${CDEPEND}
+	dev-lang/perl
+	=dev-lang/python-2*
+	sys-apps/texinfo
+	virtual/pkgconfig
+	kernel_linux? ( >=sys-kernel/linux-headers-2.6.35 )
+	gtk? ( nls? ( sys-devel/gettext ) )
+	static-softmmu? ( $(printf "%s? ( ${SOFTMMU_LIB_DEPEND} ) " ${use_softmmu_targets}) )
+	static-user? ( $(printf "%s? ( ${USER_LIB_DEPEND} ) " ${use_user_targets}) )
+	test? (
+		dev-libs/glib[utils]
+		sys-devel/bc
+	)"
+RDEPEND="${CDEPEND}
+	selinux? ( sec-policy/selinux-qemu )
+"
+
+STRIP_MASK="/usr/share/qemu/palcode-clipper"
+
+QA_PREBUILT="
+	usr/share/qemu/openbios-ppc
+	usr/share/qemu/openbios-sparc64
+	usr/share/qemu/openbios-sparc32
+	usr/share/qemu/palcode-clipper
+	usr/share/qemu/s390-ccw.img
+	usr/share/qemu/u-boot.e500
+"
+
+QA_WX_LOAD="usr/bin/qemu-i386
+	usr/bin/qemu-x86_64
+	usr/bin/qemu-alpha
+	usr/bin/qemu-arm
+	usr/bin/qemu-cris
+	usr/bin/qemu-m68k
+	usr/bin/qemu-microblaze
+	usr/bin/qemu-microblazeel
+	usr/bin/qemu-mips
+	usr/bin/qemu-mipsel
+	usr/bin/qemu-or32
+	usr/bin/qemu-ppc
+	usr/bin/qemu-ppc64
+	usr/bin/qemu-ppc64abi32
+	usr/bin/qemu-sh4
+	usr/bin/qemu-sh4eb
+	usr/bin/qemu-sparc
+	usr/bin/qemu-sparc64
+	usr/bin/qemu-armeb
+	usr/bin/qemu-sparc32plus
+	usr/bin/qemu-s390x
+	usr/bin/qemu-unicore32"
+
+DOC_CONTENTS="If you don't have kvm compiled into the kernel, make sure
+you have the kernel module loaded before running kvm. The easiest way to
+ensure that the kernel module is loaded is to load it on boot.\n
+For AMD CPUs the module is called 'kvm-amd'.\n
+For Intel CPUs the module is called 'kvm-intel'.\n
+Please review /etc/conf.d/modules for how to load these.\n\n
+Make sure your user is in the 'kvm' group\n
+Just run 'gpasswd -a <USER> kvm', then have <USER> re-login.\n\n
+For brand new installs, the default permissions on /dev/kvm might not let you
+access it.  You can tell udev to reset ownership/perms:\n
+udevadm trigger -c add /dev/kvm"
+
+qemu_support_kvm() {
+	if use qemu_softmmu_targets_x86_64 || use qemu_softmmu_targets_i386 \
+		use qemu_softmmu_targets_ppc || use qemu_softmmu_targets_ppc64 \
+		use qemu_softmmu_targets_s390x; then
+		return 0
+	fi
+
+	return 1
+}
+
+pkg_pretend() {
+	if use kernel_linux && kernel_is lt 2 6 25; then
+		eerror "This version of KVM requres a host kernel of 2.6.25 or higher."
+	elif use kernel_linux; then
+		if ! linux_config_exists; then
+			eerror "Unable to check your kernel for KVM support"
+		else
+			CONFIG_CHECK="~KVM ~TUN ~BRIDGE"
+			ERROR_KVM="You must enable KVM in your kernel to continue"
+			ERROR_KVM_AMD="If you have an AMD CPU, you must enable KVM_AMD in"
+			ERROR_KVM_AMD+=" your kernel configuration."
+			ERROR_KVM_INTEL="If you have an Intel CPU, you must enable"
+			ERROR_KVM_INTEL+=" KVM_INTEL in your kernel configuration."
+			ERROR_TUN="You will need the Universal TUN/TAP driver compiled"
+			ERROR_TUN+=" into your kernel or loaded as a module to use the"
+			ERROR_TUN+=" virtual network device if using -net tap."
+			ERROR_BRIDGE="You will also need support for 802.1d"
+			ERROR_BRIDGE+=" Ethernet Bridging for some network configurations."
+			use vhost-net && CONFIG_CHECK+=" ~VHOST_NET"
+			ERROR_VHOST_NET="You must enable VHOST_NET to have vhost-net"
+			ERROR_VHOST_NET+=" support"
+
+			if use amd64 || use x86 || use amd64-linux || use x86-linux; then
+				CONFIG_CHECK+=" ~KVM_AMD ~KVM_INTEL"
+			fi
+
+			use python && CONFIG_CHECK+=" ~DEBUG_FS"
+			ERROR_DEBUG_FS="debugFS support required for kvm_stat"
+
+			# Now do the actual checks setup above
+			check_extra_config
+		fi
+	fi
+
+	if grep -qs '/usr/bin/qemu-kvm' "${EROOT}"/etc/libvirt/qemu/*.xml; then
+		eerror "The kvm/qemu-kvm wrappers no longer exist, but your libvirt"
+		eerror "instances are still pointing to it.  Please update your"
+		eerror "configs in /etc/libvirt/qemu/ to use the -enable-kvm flag"
+		eerror "and the right system binary (e.g. qemu-system-x86_64)."
+		die "update your virt configs to not use qemu-kvm"
+	fi
+}
+
+pkg_setup() {
+	enewgroup kvm 78
+}
+
+# Sanity check to make sure target lists are kept up-to-date.
+check_targets() {
+	local var=$1 mak=$2
+	local detected sorted
+
+	pushd "${S}"/default-configs >/dev/null || die
+
+	# Force C locale until glibc is updated. #564936
+	detected=$(echo $(printf '%s\n' *-${mak}.mak | sed "s:-${mak}.mak::" | LC_COLLATE=C sort -u))
+	sorted=$(echo $(printf '%s\n' ${!var} | LC_COLLATE=C sort -u))
+	if [[ ${sorted} != "${detected}" ]] ; then
+		eerror "The ebuild needs to be kept in sync."
+		eerror "${var}: ${sorted}"
+		eerror "$(printf '%-*s' ${#var} configure): ${detected}"
+		die "sync ${var} to the list of targets"
+	fi
+
+	popd >/dev/null
+}
+
+handle_locales() {
+	# Make sure locale list is kept up-to-date.
+	local detected sorted
+	detected=$(echo $(cd po && printf '%s\n' *.po | grep -v messages.po | sed 's:.po$::' | sort -u))
+	sorted=$(echo $(printf '%s\n' ${PLOCALES} | sort -u))
+	if [[ ${sorted} != "${detected}" ]] ; then
+		eerror "The ebuild needs to be kept in sync."
+		eerror "PLOCALES: ${sorted}"
+		eerror " po/*.po: ${detected}"
+		die "sync PLOCALES"
+	fi
+
+	# Deal with selective install of locales.
+	if use nls ; then
+		# Delete locales the user does not want. #577814
+		rm_loc() { rm po/$1.po || die; }
+		l10n_for_each_disabled_locale_do rm_loc
+	else
+		# Cheap hack to disable gettext .mo generation.
+		rm -f po/*.po
+	fi
+}
+
+src_prepare() {
+	check_targets IUSE_SOFTMMU_TARGETS softmmu
+	check_targets IUSE_USER_TARGETS linux-user
+
+	# Alter target makefiles to accept CFLAGS set via flag-o
+	sed -i -r \
+		-e 's/^(C|OP_C|HELPER_C)FLAGS=/\1FLAGS+=/' \
+		Makefile Makefile.target || die
+
+	epatch "${FILESDIR}"/${PN}-2.5.0-cflags.patch
+	epatch "${FILESDIR}"/${PN}-2.5.0-sysmacros.patch
+	epatch "${FILESDIR}"/${P}-CVE-2016-6836.patch   # bug 591242
+	epatch "${FILESDIR}"/${P}-CVE-2016-7155.patch   # bug 593034
+	epatch "${FILESDIR}"/${P}-CVE-2016-7156.patch   # bug 593036
+	epatch "${FILESDIR}"/${P}-CVE-2016-7157-1.patch # bug 593038
+	epatch "${FILESDIR}"/${P}-CVE-2016-7157-2.patch # bug 593038
+
+	# Fix ld and objcopy being called directly
+	tc-export AR LD OBJCOPY
+
+	# Verbose builds
+	MAKEOPTS+=" V=1"
+
+	epatch_user
+
+	# Run after we've applied all patches.
+	handle_locales
+}
+
+##
+# configures qemu based on the build directory and the build type
+# we are using.
+#
+qemu_src_configure() {
+	debug-print-function ${FUNCNAME} "$@"
+
+	local buildtype=$1
+	local builddir="${S}/${buildtype}-build"
+	local static_flag="static-${buildtype}"
+
+	mkdir "${builddir}"
+
+	local conf_opts=(
+		--prefix=/usr
+		--sysconfdir=/etc
+		--libdir=/usr/$(get_libdir)
+		--docdir=/usr/share/doc/${PF}/html
+		--disable-bsd-user
+		--disable-guest-agent
+		--disable-strip
+		--disable-werror
+		# We support gnutls/nettle for crypto operations.  It is possible
+		# to use gcrypt when gnutls/nettle are disabled (but not when they
+		# are enabled), but it's not really worth the hassle.  Disable it
+		# all the time to avoid automatically detecting it. #568856
+		--disable-gcrypt
+		--python="${PYTHON}"
+		--cc="$(tc-getCC)"
+		--cxx="$(tc-getCXX)"
+		--host-cc="$(tc-getBUILD_CC)"
+		$(use_enable debug debug-info)
+		$(use_enable debug debug-tcg)
+		--enable-docs
+		$(use_enable tci tcg-interpreter)
+		$(use_enable xattr attr)
+	)
+
+	# Disable options not used by user targets as the default configure
+	# options will autoprobe and try to link in a bunch of unused junk.
+	conf_softmmu() {
+		if [[ ${buildtype} == "user" ]] ; then
+			echo "--disable-${2:-$1}"
+		else
+			use_enable "$@"
+		fi
+	}
+	conf_opts+=(
+		$(conf_softmmu accessibility brlapi)
+		$(conf_softmmu aio linux-aio)
+		$(conf_softmmu bzip2)
+		$(conf_softmmu bluetooth bluez)
+		$(conf_softmmu caps cap-ng)
+		$(conf_softmmu curl)
+		$(conf_softmmu fdt)
+		$(conf_softmmu glusterfs)
+		$(conf_softmmu gnutls)
+		$(conf_softmmu gnutls nettle)
+		$(conf_softmmu gtk)
+		$(conf_softmmu infiniband rdma)
+		$(conf_softmmu iscsi libiscsi)
+		$(conf_softmmu jpeg vnc-jpeg)
+		$(conf_softmmu kernel_linux kvm)
+		$(conf_softmmu lzo)
+		$(conf_softmmu ncurses curses)
+		$(conf_softmmu nfs libnfs)
+		$(conf_softmmu numa)
+		$(conf_softmmu opengl)
+		$(conf_softmmu png vnc-png)
+		$(conf_softmmu rbd)
+		$(conf_softmmu sasl vnc-sasl)
+		$(conf_softmmu sdl)
+		$(conf_softmmu seccomp)
+		$(conf_softmmu smartcard)
+		$(conf_softmmu snappy)
+		$(conf_softmmu spice)
+		$(conf_softmmu ssh libssh2)
+		$(conf_softmmu usb libusb)
+		$(conf_softmmu usbredir usb-redir)
+		$(conf_softmmu uuid)
+		$(conf_softmmu vde)
+		$(conf_softmmu vhost-net)
+		$(conf_softmmu virgl virglrenderer)
+		$(conf_softmmu virtfs)
+		$(conf_softmmu vnc)
+		$(conf_softmmu vte)
+		$(conf_softmmu xen)
+		$(conf_softmmu xen xen-pci-passthrough)
+		$(conf_softmmu xfs xfsctl)
+	)
+
+	case ${buildtype} in
+	user)
+		conf_opts+=(
+			--enable-linux-user
+			--disable-system
+			--disable-blobs
+			--disable-tools
+		)
+		;;
+	softmmu)
+		# audio options
+		local audio_opts="oss"
+		use alsa && audio_opts="alsa,${audio_opts}"
+		use sdl && audio_opts="sdl,${audio_opts}"
+		use pulseaudio && audio_opts="pa,${audio_opts}"
+
+		conf_opts+=(
+			--disable-linux-user
+			--enable-system
+			--with-system-pixman
+			--audio-drv-list="${audio_opts}"
+		)
+		use gtk && conf_opts+=( --with-gtkabi=$(usex gtk2 2.0 3.0) )
+		use sdl && conf_opts+=( --with-sdlabi=$(usex sdl2 2.0 1.2) )
+		;;
+	tools)
+		conf_opts+=(
+			--disable-linux-user
+			--disable-system
+			--disable-blobs
+			$(use_enable bzip2)
+		)
+		static_flag="static"
+		;;
+	esac
+
+	local targets="${buildtype}_targets"
+	[[ -n ${targets} ]] && conf_opts+=( --target-list="${!targets}" )
+
+	# Add support for SystemTAP
+	use systemtap && conf_opts+=( --enable-trace-backend=dtrace )
+
+	# We always want to attempt to build with PIE support as it results
+	# in a more secure binary. But it doesn't work with static or if
+	# the current GCC doesn't have PIE support.
+	if use ${static_flag}; then
+		conf_opts+=( --static --disable-pie )
+	else
+		gcc-specs-pie && conf_opts+=( --enable-pie )
+	fi
+
+	echo "../configure ${conf_opts[*]}"
+	cd "${builddir}"
+	../configure "${conf_opts[@]}" || die "configure failed"
+
+	# FreeBSD's kernel does not support QEMU assigning/grabbing
+	# host USB devices yet
+	use kernel_FreeBSD && \
+		sed -i -E -e "s|^(HOST_USB=)bsd|\1stub|" "${S}"/config-host.mak
+}
+
+src_configure() {
+	local target
+
+	python_setup
+
+	softmmu_targets= softmmu_bins=()
+	user_targets= user_bins=()
+
+	for target in ${IUSE_SOFTMMU_TARGETS} ; do
+		if use "qemu_softmmu_targets_${target}"; then
+			softmmu_targets+=",${target}-softmmu"
+			softmmu_bins+=( "qemu-system-${target}" )
+		fi
+	done
+
+	for target in ${IUSE_USER_TARGETS} ; do
+		if use "qemu_user_targets_${target}"; then
+			user_targets+=",${target}-linux-user"
+			user_bins+=( "qemu-${target}" )
+		fi
+	done
+
+	softmmu_targets=${softmmu_targets#,}
+	user_targets=${user_targets#,}
+
+	[[ -n ${softmmu_targets} ]] && qemu_src_configure "softmmu"
+	[[ -n ${user_targets}    ]] && qemu_src_configure "user"
+	[[ -z ${softmmu_targets}${user_targets} ]] && qemu_src_configure "tools"
+}
+
+src_compile() {
+	if [[ -n ${user_targets} ]]; then
+		cd "${S}/user-build"
+		default
+	fi
+
+	if [[ -n ${softmmu_targets} ]]; then
+		cd "${S}/softmmu-build"
+		default
+	fi
+
+	if [[ -z ${softmmu_targets}${user_targets} ]]; then
+		cd "${S}/tools-build"
+		default
+	fi
+}
+
+src_test() {
+	if [[ -n ${softmmu_targets} ]]; then
+		cd "${S}/softmmu-build"
+		pax-mark m */qemu-system-* #515550
+		emake -j1 check
+		emake -j1 check-report.html
+	fi
+}
+
+qemu_python_install() {
+	python_domodule "${S}/scripts/qmp/qmp.py"
+
+	python_doscript "${S}/scripts/kvm/vmxcap"
+	python_doscript "${S}/scripts/qmp/qmp-shell"
+	python_doscript "${S}/scripts/qmp/qemu-ga-client"
+}
+
+src_install() {
+	if [[ -n ${user_targets} ]]; then
+		cd "${S}/user-build"
+		emake DESTDIR="${ED}" install
+
+		# Install binfmt handler init script for user targets
+		newinitd "${FILESDIR}/qemu-binfmt.initd-r1" qemu-binfmt
+	fi
+
+	if [[ -n ${softmmu_targets} ]]; then
+		cd "${S}/softmmu-build"
+		emake DESTDIR="${ED}" install
+
+		# This might not exist if the test failed. #512010
+		[[ -e check-report.html ]] && dohtml check-report.html
+
+		if use kernel_linux; then
+			udev_dorules "${FILESDIR}"/65-kvm.rules
+		fi
+
+		if use python; then
+			python_foreach_impl qemu_python_install
+		fi
+	fi
+
+	if [[ -z ${softmmu_targets}${user_targets} ]]; then
+		cd "${S}/tools-build"
+		emake DESTDIR="${ED}" install
+	fi
+
+	# Disable mprotect on the qemu binaries as they use JITs to be fast #459348
+	pushd "${ED}"/usr/bin >/dev/null
+	pax-mark m "${softmmu_bins[@]}" "${user_bins[@]}"
+	popd >/dev/null
+
+	# Install config file example for qemu-bridge-helper
+	insinto "/etc/qemu"
+	doins "${FILESDIR}/bridge.conf"
+
+	# Remove the docdir placed qmp-commands.txt
+	mv "${ED}/usr/share/doc/${PF}/html/qmp-commands.txt" "${S}/docs/" || die
+
+	cd "${S}"
+	dodoc Changelog MAINTAINERS docs/specs/pci-ids.txt
+	newdoc pc-bios/README README.pc-bios
+	dodoc docs/qmp-*.txt
+
+	if [[ -n ${softmmu_targets} ]]; then
+		# Remove SeaBIOS since we're using the SeaBIOS packaged one
+		rm "${ED}/usr/share/qemu/bios.bin"
+		if use qemu_softmmu_targets_x86_64 || use qemu_softmmu_targets_i386; then
+			dosym ../seabios/bios.bin /usr/share/qemu/bios.bin
+		fi
+
+		# Remove vgabios since we're using the vgabios packaged one
+		rm "${ED}/usr/share/qemu/vgabios.bin"
+		rm "${ED}/usr/share/qemu/vgabios-cirrus.bin"
+		rm "${ED}/usr/share/qemu/vgabios-qxl.bin"
+		rm "${ED}/usr/share/qemu/vgabios-stdvga.bin"
+		rm "${ED}/usr/share/qemu/vgabios-vmware.bin"
+		if use qemu_softmmu_targets_x86_64 || use qemu_softmmu_targets_i386; then
+			dosym ../vgabios/vgabios.bin /usr/share/qemu/vgabios.bin
+			dosym ../vgabios/vgabios-cirrus.bin /usr/share/qemu/vgabios-cirrus.bin
+			dosym ../vgabios/vgabios-qxl.bin /usr/share/qemu/vgabios-qxl.bin
+			dosym ../vgabios/vgabios-stdvga.bin /usr/share/qemu/vgabios-stdvga.bin
+			dosym ../vgabios/vgabios-vmware.bin /usr/share/qemu/vgabios-vmware.bin
+		fi
+
+		# Remove sgabios since we're using the sgabios packaged one
+		rm "${ED}/usr/share/qemu/sgabios.bin"
+		if use qemu_softmmu_targets_x86_64 || use qemu_softmmu_targets_i386; then
+			dosym ../sgabios/sgabios.bin /usr/share/qemu/sgabios.bin
+		fi
+
+		# Remove iPXE since we're using the iPXE packaged one
+		rm "${ED}"/usr/share/qemu/pxe-*.rom
+		if use qemu_softmmu_targets_x86_64 || use qemu_softmmu_targets_i386; then
+			dosym ../ipxe/8086100e.rom /usr/share/qemu/pxe-e1000.rom
+			dosym ../ipxe/80861209.rom /usr/share/qemu/pxe-eepro100.rom
+			dosym ../ipxe/10500940.rom /usr/share/qemu/pxe-ne2k_pci.rom
+			dosym ../ipxe/10222000.rom /usr/share/qemu/pxe-pcnet.rom
+			dosym ../ipxe/10ec8139.rom /usr/share/qemu/pxe-rtl8139.rom
+			dosym ../ipxe/1af41000.rom /usr/share/qemu/pxe-virtio.rom
+		fi
+	fi
+
+	qemu_support_kvm && readme.gentoo_create_doc
+}
+
+pkg_postinst() {
+	if qemu_support_kvm; then
+		readme.gentoo_print_elog
+	fi
+
+	if [[ -n ${softmmu_targets} ]] && use kernel_linux; then
+		udev_reload
+	fi
+
+	fcaps cap_net_admin /usr/libexec/qemu-bridge-helper
+}
+
+pkg_info() {
+	echo "Using:"
+	echo "  $(best_version app-emulation/spice-protocol)"
+	echo "  $(best_version sys-firmware/ipxe)"
+	echo "  $(best_version sys-firmware/seabios)"
+	if has_version 'sys-firmware/seabios[binary]'; then
+		echo "    USE=binary"
+	else
+		echo "    USE=''"
+	fi
+	echo "  $(best_version sys-firmware/vgabios)"
+}