Add fixes from upstream for CVE-2015-1779 #544328 by Agostino Sarubbo.

(Portage version: 2.2.18/cvs/Linux x86_64, signed Manifest commit with key D2E96200)

4 files changed, 910 insertions, 1 deletions

diff --git a/app-emulation/qemu/ChangeLog b/app-emulation/qemu/ChangeLog
index b57805bcedb2..3c83df8e8e73 100644
--- a/app-emulation/qemu/ChangeLog
+++ b/app-emulation/qemu/ChangeLog
@@ -1,6 +1,13 @@
 # ChangeLog for app-emulation/qemu
 # Copyright 1999-2015 Gentoo Foundation; Distributed under the GPL v2
-# $Header: /var/cvsroot/gentoo-x86/app-emulation/qemu/ChangeLog,v 1.321 2015/04/08 07:30:33 mgorny Exp $
+# $Header: /var/cvsroot/gentoo-x86/app-emulation/qemu/ChangeLog,v 1.322 2015/04/12 00:29:22 vapier Exp $
+
+*qemu-2.2.1-r1 (12 Apr 2015)
+
+  12 Apr 2015; Mike Frysinger <vapier@gentoo.org>
+  +files/qemu-2.2.1-CVE-2015-1779-1.patch,
+  +files/qemu-2.2.1-CVE-2015-1779-2.patch, +qemu-2.2.1-r1.ebuild:
+  Add fixes from upstream for CVE-2015-1779 #544328 by Agostino Sarubbo.
 
   08 Apr 2015; Michał Górny <mgorny@gentoo.org> qemu-2.1.2-r2.ebuild,
   qemu-2.1.3.ebuild, qemu-2.2.0.ebuild, qemu-2.2.1.ebuild:
diff --git a/app-emulation/qemu/files/qemu-2.2.1-CVE-2015-1779-1.patch b/app-emulation/qemu/files/qemu-2.2.1-CVE-2015-1779-1.patch
new file mode 100644
index 000000000000..35ef8fdebf0a
--- /dev/null
+++ b/app-emulation/qemu/files/qemu-2.2.1-CVE-2015-1779-1.patch
@@ -0,0 +1,241 @@
+From a2bebfd6e09d285aa793cae3fb0fc3a39a9fee6e Mon Sep 17 00:00:00 2001
+From: "Daniel P. Berrange" <berrange@redhat.com>
+Date: Mon, 23 Mar 2015 22:58:21 +0000
+Subject: [PATCH] CVE-2015-1779: incrementally decode websocket frames
+
+The logic for decoding websocket frames wants to fully
+decode the frame header and payload, before allowing the
+VNC server to see any of the payload data. There is no
+size limit on websocket payloads, so this allows a
+malicious network client to consume 2^64 bytes in memory
+in QEMU. It can trigger this denial of service before
+the VNC server even performs any authentication.
+
+The fix is to decode the header, and then incrementally
+decode the payload data as it is needed. With this fix
+the websocket decoder will allow at most 4k of data to
+be buffered before decoding and processing payload.
+
+Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
+
+[ kraxel: fix frequent spurious disconnects, suggested by Peter Maydell ]
+
+  @@ -361,7 +361,7 @@ int vncws_decode_frame_payload(Buffer *input,
+  -        *payload_size = input->offset;
+  +        *payload_size = *payload_remain;
+
+[ kraxel: fix 32bit build ]
+
+  @@ -306,7 +306,7 @@ struct VncState
+  -    uint64_t ws_payload_remain;
+  +    size_t ws_payload_remain;
+
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+---
+ ui/vnc-ws.c | 105 ++++++++++++++++++++++++++++++++++++++++--------------------
+ ui/vnc-ws.h |   9 ++++--
+ ui/vnc.h    |   2 ++
+ 3 files changed, 80 insertions(+), 36 deletions(-)
+
+diff --git a/ui/vnc-ws.c b/ui/vnc-ws.c
+index 85dbb7e..0b7de4e 100644
+--- a/ui/vnc-ws.c
++++ b/ui/vnc-ws.c
+@@ -107,7 +107,7 @@ long vnc_client_read_ws(VncState *vs)
+ {
+     int ret, err;
+     uint8_t *payload;
+-    size_t payload_size, frame_size;
++    size_t payload_size, header_size;
+     VNC_DEBUG("Read websocket %p size %zd offset %zd\n", vs->ws_input.buffer,
+             vs->ws_input.capacity, vs->ws_input.offset);
+     buffer_reserve(&vs->ws_input, 4096);
+@@ -117,18 +117,39 @@ long vnc_client_read_ws(VncState *vs)
+     }
+     vs->ws_input.offset += ret;
+ 
+-    /* make sure that nothing is left in the ws_input buffer */
++    ret = 0;
++    /* consume as much of ws_input buffer as possible */
+     do {
+-        err = vncws_decode_frame(&vs->ws_input, &payload,
+-                              &payload_size, &frame_size);
+-        if (err <= 0) {
+-            return err;
++        if (vs->ws_payload_remain == 0) {
++            err = vncws_decode_frame_header(&vs->ws_input,
++                                            &header_size,
++                                            &vs->ws_payload_remain,
++                                            &vs->ws_payload_mask);
++            if (err <= 0) {
++                return err;
++            }
++
++            buffer_advance(&vs->ws_input, header_size);
+         }
++        if (vs->ws_payload_remain != 0) {
++            err = vncws_decode_frame_payload(&vs->ws_input,
++                                             &vs->ws_payload_remain,
++                                             &vs->ws_payload_mask,
++                                             &payload,
++                                             &payload_size);
++            if (err < 0) {
++                return err;
++            }
++            if (err == 0) {
++                return ret;
++            }
++            ret += err;
+ 
+-        buffer_reserve(&vs->input, payload_size);
+-        buffer_append(&vs->input, payload, payload_size);
++            buffer_reserve(&vs->input, payload_size);
++            buffer_append(&vs->input, payload, payload_size);
+ 
+-        buffer_advance(&vs->ws_input, frame_size);
++            buffer_advance(&vs->ws_input, payload_size);
++        }
+     } while (vs->ws_input.offset > 0);
+ 
+     return ret;
+@@ -265,15 +286,14 @@ void vncws_encode_frame(Buffer *output, const void *payload,
+     buffer_append(output, payload, payload_size);
+ }
+ 
+-int vncws_decode_frame(Buffer *input, uint8_t **payload,
+-                           size_t *payload_size, size_t *frame_size)
++int vncws_decode_frame_header(Buffer *input,
++                              size_t *header_size,
++                              size_t *payload_remain,
++                              WsMask *payload_mask)
+ {
+     unsigned char opcode = 0, fin = 0, has_mask = 0;
+-    size_t header_size = 0;
+-    uint32_t *payload32;
++    size_t payload_len;
+     WsHeader *header = (WsHeader *)input->buffer;
+-    WsMask mask;
+-    int i;
+ 
+     if (input->offset < WS_HEAD_MIN_LEN + 4) {
+         /* header not complete */
+@@ -283,7 +303,7 @@ int vncws_decode_frame(Buffer *input, uint8_t **payload,
+     fin = (header->b0 & 0x80) >> 7;
+     opcode = header->b0 & 0x0f;
+     has_mask = (header->b1 & 0x80) >> 7;
+-    *payload_size = header->b1 & 0x7f;
++    payload_len = header->b1 & 0x7f;
+ 
+     if (opcode == WS_OPCODE_CLOSE) {
+         /* disconnect */
+@@ -300,40 +320,57 @@ int vncws_decode_frame(Buffer *input, uint8_t **payload,
+         return -2;
+     }
+ 
+-    if (*payload_size < 126) {
+-        header_size = 6;
+-        mask = header->u.m;
+-    } else if (*payload_size == 126 && input->offset >= 8) {
+-        *payload_size = be16_to_cpu(header->u.s16.l16);
+-        header_size = 8;
+-        mask = header->u.s16.m16;
+-    } else if (*payload_size == 127 && input->offset >= 14) {
+-        *payload_size = be64_to_cpu(header->u.s64.l64);
+-        header_size = 14;
+-        mask = header->u.s64.m64;
++    if (payload_len < 126) {
++        *payload_remain = payload_len;
++        *header_size = 6;
++        *payload_mask = header->u.m;
++    } else if (payload_len == 126 && input->offset >= 8) {
++        *payload_remain = be16_to_cpu(header->u.s16.l16);
++        *header_size = 8;
++        *payload_mask = header->u.s16.m16;
++    } else if (payload_len == 127 && input->offset >= 14) {
++        *payload_remain = be64_to_cpu(header->u.s64.l64);
++        *header_size = 14;
++        *payload_mask = header->u.s64.m64;
+     } else {
+         /* header not complete */
+         return 0;
+     }
+ 
+-    *frame_size = header_size + *payload_size;
++    return 1;
++}
++
++int vncws_decode_frame_payload(Buffer *input,
++                               size_t *payload_remain, WsMask *payload_mask,
++                               uint8_t **payload, size_t *payload_size)
++{
++    size_t i;
++    uint32_t *payload32;
+ 
+-    if (input->offset < *frame_size) {
+-        /* frame not complete */
++    *payload = input->buffer;
++    /* If we aren't at the end of the payload, then drop
++     * off the last bytes, so we're always multiple of 4
++     * for purpose of unmasking, except at end of payload
++     */
++    if (input->offset < *payload_remain) {
++        *payload_size = input->offset - (input->offset % 4);
++    } else {
++        *payload_size = *payload_remain;
++    }
++    if (*payload_size == 0) {
+         return 0;
+     }
+-
+-    *payload = input->buffer + header_size;
++    *payload_remain -= *payload_size;
+ 
+     /* unmask frame */
+     /* process 1 frame (32 bit op) */
+     payload32 = (uint32_t *)(*payload);
+     for (i = 0; i < *payload_size / 4; i++) {
+-        payload32[i] ^= mask.u;
++        payload32[i] ^= payload_mask->u;
+     }
+     /* process the remaining bytes (if any) */
+     for (i *= 4; i < *payload_size; i++) {
+-        (*payload)[i] ^= mask.c[i % 4];
++        (*payload)[i] ^= payload_mask->c[i % 4];
+     }
+ 
+     return 1;
+diff --git a/ui/vnc-ws.h b/ui/vnc-ws.h
+index ef229b7..14d4230 100644
+--- a/ui/vnc-ws.h
++++ b/ui/vnc-ws.h
+@@ -83,7 +83,12 @@ long vnc_client_read_ws(VncState *vs);
+ void vncws_process_handshake(VncState *vs, uint8_t *line, size_t size);
+ void vncws_encode_frame(Buffer *output, const void *payload,
+             const size_t payload_size);
+-int vncws_decode_frame(Buffer *input, uint8_t **payload,
+-                               size_t *payload_size, size_t *frame_size);
++int vncws_decode_frame_header(Buffer *input,
++                              size_t *header_size,
++                              size_t *payload_remain,
++                              WsMask *payload_mask);
++int vncws_decode_frame_payload(Buffer *input,
++                               size_t *payload_remain, WsMask *payload_mask,
++                               uint8_t **payload, size_t *payload_size);
+ 
+ #endif /* __QEMU_UI_VNC_WS_H */
+diff --git a/ui/vnc.h b/ui/vnc.h
+index e19ac39..3f7c6a9 100644
+--- a/ui/vnc.h
++++ b/ui/vnc.h
+@@ -306,6 +306,8 @@ struct VncState
+ #ifdef CONFIG_VNC_WS
+     Buffer ws_input;
+     Buffer ws_output;
++    size_t ws_payload_remain;
++    WsMask ws_payload_mask;
+ #endif
+     /* current output mode information */
+     VncWritePixels *write_pixels;
+-- 
+2.3.5
+
diff --git a/app-emulation/qemu/files/qemu-2.2.1-CVE-2015-1779-2.patch b/app-emulation/qemu/files/qemu-2.2.1-CVE-2015-1779-2.patch
new file mode 100644
index 000000000000..c7a8c8b3ec7f
--- /dev/null
+++ b/app-emulation/qemu/files/qemu-2.2.1-CVE-2015-1779-2.patch
@@ -0,0 +1,58 @@
+From 2cdb5e142fb93e875fa53c52864ef5eb8d5d8b41 Mon Sep 17 00:00:00 2001
+From: "Daniel P. Berrange" <berrange@redhat.com>
+Date: Mon, 23 Mar 2015 22:58:22 +0000
+Subject: [PATCH] CVE-2015-1779: limit size of HTTP headers from websockets
+ clients
+
+The VNC server websockets decoder will read and buffer data from
+websockets clients until it sees the end of the HTTP headers,
+as indicated by \r\n\r\n. In theory this allows a malicious to
+trick QEMU into consuming an arbitrary amount of RAM. In practice,
+because QEMU runs g_strstr_len() across the buffered header data,
+it will spend increasingly long burning CPU time searching for
+the substring match and less & less time reading data. So while
+this does cause arbitrary memory growth, the bigger problem is
+that QEMU will be burning 100% of available CPU time.
+
+A novnc websockets client typically sends headers of around
+512 bytes in length. As such it is reasonable to place a 4096
+byte limit on the amount of data buffered while searching for
+the end of HTTP headers.
+
+Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+---
+ ui/vnc-ws.c | 10 ++++++++--
+ 1 file changed, 8 insertions(+), 2 deletions(-)
+
+diff --git a/ui/vnc-ws.c b/ui/vnc-ws.c
+index 0b7de4e..62eb97f 100644
+--- a/ui/vnc-ws.c
++++ b/ui/vnc-ws.c
+@@ -81,8 +81,11 @@ void vncws_handshake_read(void *opaque)
+     VncState *vs = opaque;
+     uint8_t *handshake_end;
+     long ret;
+-    buffer_reserve(&vs->ws_input, 4096);
+-    ret = vnc_client_read_buf(vs, buffer_end(&vs->ws_input), 4096);
++    /* Typical HTTP headers from novnc are 512 bytes, so limiting
++     * total header size to 4096 is easily enough. */
++    size_t want = 4096 - vs->ws_input.offset;
++    buffer_reserve(&vs->ws_input, want);
++    ret = vnc_client_read_buf(vs, buffer_end(&vs->ws_input), want);
+ 
+     if (!ret) {
+         if (vs->csock == -1) {
+@@ -99,6 +102,9 @@ void vncws_handshake_read(void *opaque)
+         vncws_process_handshake(vs, vs->ws_input.buffer, vs->ws_input.offset);
+         buffer_advance(&vs->ws_input, handshake_end - vs->ws_input.buffer +
+                 strlen(WS_HANDSHAKE_END));
++    } else if (vs->ws_input.offset >= 4096) {
++        VNC_DEBUG("End of headers not found in first 4096 bytes\n");
++        vnc_client_error(vs);
+     }
+ }
+ 
+-- 
+2.3.5
+
diff --git a/app-emulation/qemu/qemu-2.2.1-r1.ebuild b/app-emulation/qemu/qemu-2.2.1-r1.ebuild
new file mode 100644
index 000000000000..d745ed4a2e79
--- /dev/null
+++ b/app-emulation/qemu/qemu-2.2.1-r1.ebuild
@@ -0,0 +1,603 @@
+# Copyright 1999-2015 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Header: /var/cvsroot/gentoo-x86/app-emulation/qemu/qemu-2.2.1-r1.ebuild,v 1.1 2015/04/12 00:29:22 vapier Exp $
+
+EAPI=5
+
+PYTHON_COMPAT=( python2_7 )
+PYTHON_REQ_USE="ncurses,readline"
+
+inherit eutils flag-o-matic linux-info toolchain-funcs multilib python-r1 \
+	user udev fcaps readme.gentoo pax-utils
+
+BACKPORTS=
+
+if [[ ${PV} = *9999* ]]; then
+	EGIT_REPO_URI="git://git.qemu.org/qemu.git"
+	inherit git-2
+	SRC_URI=""
+	KEYWORDS=""
+else
+	SRC_URI="http://wiki.qemu-project.org/download/${P}.tar.bz2
+	${BACKPORTS:+
+		http://dev.gentoo.org/~cardoe/distfiles/${P}-${BACKPORTS}.tar.xz}"
+	KEYWORDS="~amd64 ~ppc ~ppc64 ~x86 ~x86-fbsd"
+fi
+
+DESCRIPTION="QEMU + Kernel-based Virtual Machine userland tools"
+HOMEPAGE="http://www.qemu.org http://www.linux-kvm.org"
+
+LICENSE="GPL-2 LGPL-2 BSD-2"
+SLOT="0"
+IUSE="accessibility +aio alsa bluetooth +caps +curl debug +fdt glusterfs \
+gtk infiniband iscsi +jpeg \
+kernel_linux kernel_FreeBSD lzo ncurses nfs nls numa opengl +pin-upstream-blobs
++png pulseaudio python \
+rbd sasl +seccomp sdl selinux smartcard snappy spice ssh static static-softmmu \
+static-user systemtap tci test +threads tls usb usbredir +uuid vde +vhost-net \
+virtfs +vnc xattr xen xfs"
+
+COMMON_TARGETS="aarch64 alpha arm cris i386 m68k microblaze microblazeel mips
+mips64 mips64el mipsel or32 ppc ppc64 s390x sh4 sh4eb sparc sparc64 unicore32
+x86_64"
+IUSE_SOFTMMU_TARGETS="${COMMON_TARGETS} lm32 moxie ppcemb xtensa xtensaeb"
+IUSE_USER_TARGETS="${COMMON_TARGETS} armeb mipsn32 mipsn32el ppc64abi32 sparc32plus"
+
+use_targets="
+	$(printf ' qemu_softmmu_targets_%s' ${IUSE_SOFTMMU_TARGETS})
+	$(printf ' qemu_user_targets_%s' ${IUSE_USER_TARGETS})
+"
+IUSE+=" ${use_targets}"
+
+# Require at least one softmmu or user target.
+# Block USE flag configurations known to not work.
+REQUIRED_USE="|| ( ${use_targets} )
+	${PYTHON_REQUIRED_USE}
+	qemu_softmmu_targets_arm? ( fdt )
+	qemu_softmmu_targets_microblaze? ( fdt )
+	qemu_softmmu_targets_ppc? ( fdt )
+	qemu_softmmu_targets_ppc64? ( fdt )
+	static? ( static-softmmu static-user )
+	static-softmmu? ( !alsa !pulseaudio !bluetooth !opengl !gtk )
+	virtfs? ( xattr )"
+
+# Yep, you need both libcap and libcap-ng since virtfs only uses libcap.
+#
+# The attr lib isn't always linked in (although the USE flag is always
+# respected).  This is because qemu supports using the C library's API
+# when available rather than always using the extranl library.
+COMMON_LIB_DEPEND=">=dev-libs/glib-2.0[static-libs(+)]
+	sys-libs/zlib[static-libs(+)]
+	xattr? ( sys-apps/attr[static-libs(+)] )"
+SOFTMMU_LIB_DEPEND="${COMMON_LIB_DEPEND}
+	>=x11-libs/pixman-0.28.0[static-libs(+)]
+	aio? ( dev-libs/libaio[static-libs(+)] )
+	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(+)] )
+	infiniband? ( sys-infiniband/librdmacm:=[static-libs(+)] )
+	jpeg? ( virtual/jpeg:=[static-libs(+)] )
+	lzo? ( dev-libs/lzo:2[static-libs(+)] )
+	ncurses? ( sys-libs/ncurses[static-libs(+)] )
+	nfs? ( >=net-fs/libnfs-1.9.3[static-libs(+)] )
+	numa? ( sys-process/numactl[static-libs(+)] )
+	png? ( media-libs/libpng:0=[static-libs(+)] )
+	rbd? ( sys-cluster/ceph[static-libs(+)] )
+	sasl? ( dev-libs/cyrus-sasl[static-libs(+)] )
+	sdl? ( >=media-libs/libsdl-1.2.11[static-libs(+)] )
+	seccomp? ( >=sys-libs/libseccomp-2.1.0[static-libs(+)] )
+	snappy? ( app-arch/snappy[static-libs(+)] )
+	spice? ( >=app-emulation/spice-0.12.0[static-libs(+)] )
+	ssh? ( >=net-libs/libssh2-1.2.8[static-libs(+)] )
+	tls? ( net-libs/gnutls[static-libs(+)] )
+	usb? ( >=dev-libs/libusb-1.0.18[static-libs(+)] )
+	uuid? ( >=sys-apps/util-linux-2.16.0[static-libs(+)] )
+	vde? ( net-misc/vde[static-libs(+)] )
+	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-1.7.5
+		~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? ( ${SOFTMMU_LIB_DEPEND//\[static-libs(+)]} )
+	!static-user? ( ${USER_LIB_DEPEND//\[static-libs(+)]} )
+	qemu_softmmu_targets_i386? ( ${X86_FIRMWARE_DEPEND} )
+	qemu_softmmu_targets_x86_64? ( ${X86_FIRMWARE_DEPEND} )
+	accessibility? ( app-accessibility/brltty )
+	alsa? ( >=media-libs/alsa-lib-1.0.13 )
+	bluetooth? ( net-wireless/bluez )
+	gtk? (
+		x11-libs/gtk+:3
+		x11-libs/vte:2.90
+	)
+	iscsi? ( net-libs/libiscsi )
+	opengl? ( virtual/opengl )
+	pulseaudio? ( media-sound/pulseaudio )
+	python? ( ${PYTHON_DEPS} )
+	sdl? ( media-libs/libsdl[X] )
+	smartcard? ( dev-libs/nss !app-emulation/libcacard )
+	spice? ( >=app-emulation/spice-protocol-0.12.3 )
+	systemtap? ( dev-util/systemtap )
+	usbredir? ( >=sys-apps/usbredir-0.6 )
+	virtfs? ( sys-libs/libcap )
+	xen? ( app-emulation/xen-tools )"
+DEPEND="${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? ( ${SOFTMMU_LIB_DEPEND} )
+	static-user? ( ${USER_LIB_DEPEND} )
+	test? (
+		dev-libs/glib[utils]
+		sys-devel/bc
+	)"
+RDEPEND="${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."
+
+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' "${EROOT}"/etc/libvirt/qemu/*.xml; then
+		eerror "The kvm/qemu-kvm wrappers no longer exist, but your libvirt"
+		eerror "instances are still pointing to it.  Please update your"
+		eerror "configs in /etc/libvirt/qemu/ to use the -enable-kvm flag"
+		eerror "and the right system binary (e.g. qemu-system-x86_64)."
+		die "update your virt configs to not use qemu-kvm"
+	fi
+}
+
+pkg_setup() {
+	enewgroup kvm 78
+	python_setup
+}
+
+src_prepare() {
+	# Alter target makefiles to accept CFLAGS set via flag-o
+	sed -i -r \
+		-e 's/^(C|OP_C|HELPER_C)FLAGS=/\1FLAGS+=/' \
+		Makefile Makefile.target || die
+
+	# Cheap hack to disable gettext .mo generation.
+	use nls || rm -f po/*.po
+
+	epatch "${FILESDIR}"/qemu-1.7.0-cflags.patch
+	epatch "${FILESDIR}"/${P}-CVE-2015-1779-1.patch #544328
+	epatch "${FILESDIR}"/${P}-CVE-2015-1779-2.patch #544328
+	[[ -n ${BACKPORTS} ]] && \
+		EPATCH_FORCE=yes EPATCH_SUFFIX="patch" EPATCH_SOURCE="${S}/patches" \
+			epatch
+
+	# Fix ld and objcopy being called directly
+	tc-export AR LD OBJCOPY
+
+	# Verbose builds
+	MAKEOPTS+=" V=1"
+
+	epatch_user
+}
+
+##
+# 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=$2
+	local static_flag="static-${buildtype}"
+
+	# 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,${audio_opts}"
+
+	local conf_opts=(
+		--prefix=/usr
+		--sysconfdir=/etc
+		--libdir=/usr/$(get_libdir)
+		--docdir=/usr/share/doc/${PF}/html
+		--disable-bsd-user
+		--disable-guest-agent
+		--disable-strip
+		--disable-werror
+		--python="${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 bluetooth bluez)
+		$(conf_softmmu caps cap-ng)
+		$(conf_softmmu curl)
+		$(conf_softmmu fdt)
+		$(conf_softmmu glusterfs)
+		$(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 glx)
+		$(conf_softmmu png vnc-png)
+		$(conf_softmmu rbd)
+		$(conf_softmmu sasl vnc-sasl)
+		$(conf_softmmu sdl)
+		$(conf_softmmu seccomp)
+		$(conf_softmmu smartcard smartcard-nss)
+		$(conf_softmmu snappy)
+		$(conf_softmmu spice)
+		$(conf_softmmu ssh libssh2)
+		$(conf_softmmu tls quorum)
+		$(conf_softmmu tls vnc-tls)
+		$(conf_softmmu tls vnc-ws)
+		$(conf_softmmu usb libusb)
+		$(conf_softmmu usbredir usb-redir)
+		$(conf_softmmu uuid)
+		$(conf_softmmu vde)
+		$(conf_softmmu vhost-net)
+		$(conf_softmmu virtfs)
+		$(conf_softmmu vnc)
+		$(conf_softmmu xen)
+		$(conf_softmmu xen xen-pci-passthrough)
+		$(conf_softmmu xfs xfsctl)
+	)
+
+	case ${buildtype} in
+	user)
+		conf_opts+=(
+			--enable-linux-user
+			--disable-system
+			--target-list="${user_targets}"
+			--disable-blobs
+			--disable-tools
+		)
+		;;
+	softmmu)
+		conf_opts+=(
+			--disable-linux-user
+			--enable-system
+			--target-list="${softmmu_targets}"
+			--with-system-pixman
+			--audio-drv-list="${audio_opts}"
+		)
+		use gtk && conf_opts+=( --with-gtkabi=3.0 )
+		;;
+	esac
+
+	# 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
+
+	einfo "../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_export_best
+
+	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
+
+	[[ -n ${softmmu_targets} ]] && \
+		einfo "Building the following softmmu targets: ${softmmu_targets}"
+
+	[[ -n ${user_targets} ]] && \
+		einfo "Building the following user targets: ${user_targets}"
+
+	if [[ -n ${softmmu_targets} ]]; then
+		mkdir "${S}/softmmu-build"
+		qemu_src_configure "softmmu" "${S}/softmmu-build"
+	fi
+
+	if [[ -n ${user_targets} ]]; then
+		mkdir "${S}/user-build"
+		qemu_src_configure "user" "${S}/user-build"
+	fi
+}
+
+src_compile() {
+	if [[ -n ${user_targets} ]]; then
+		cd "${S}/user-build"
+		default
+	fi
+
+	if [[ -n ${softmmu_targets} ]]; then
+		cd "${S}/softmmu-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/kvm_stat"
+	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
+
+	# 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" "${S}/docs/qmp/"
+
+	cd "${S}"
+	dodoc Changelog MAINTAINERS docs/specs/pci-ids.txt
+	newdoc pc-bios/README README.pc-bios
+	dodoc docs/qmp/*.txt
+
+	# 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
+	if [[ -n ${softmmu_targets} ]]; then
+		rm "${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
+		ewarn "Migration from qemu-kvm instances and loading qemu-kvm created"
+		ewarn "save states has been removed starting with the 1.6.2 release"
+		ewarn
+		ewarn "It is recommended that you migrate any VMs that may be running"
+		ewarn "on qemu-kvm to a host with a newer qemu and regenerate"
+		ewarn "any saved states with a newer qemu."
+		ewarn
+		ewarn "qemu-kvm was the primary qemu provider in Gentoo through 1.2.x"
+
+		if use x86 || use amd64; then
+			ewarn
+			ewarn "The /usr/bin/kvm and /usr/bin/qemu-kvm wrappers are no longer"
+			ewarn "installed.  In order to use kvm acceleration, pass the flag"
+			ewarn "-enable-kvm when running your system target."
+		fi
+	fi
+
+	if [[ -n ${softmmu_targets} ]] && use kernel_linux; then
+		udev_reload
+	fi
+
+	fcaps cap_net_admin /usr/libexec/qemu-bridge-helper
+	if use virtfs && [ -n "${softmmu_targets}" ]; then
+		local virtfs_caps="cap_chown,cap_dac_override,cap_fowner,cap_fsetid,cap_setgid,cap_mknod,cap_setuid"
+		fcaps ${virtfs_caps} /usr/bin/virtfs-proxy-helper
+	fi
+}
+
+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)"
+}