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import OL qemu-kvm-8.2.0-11.el9_4.6

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eabdullin 2024-09-04 05:31:51 +00:00
parent bbc5de2b9d
commit b8753d7e41
10 changed files with 1316 additions and 1 deletions
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128
SOURCES/kvm-Fix-scanout-version-with-pc-q35-rhel9.4.0.patch Normal file
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@ -0,0 +1,128 @@
From ef212eb3026a2460f6502a76afa3baedeb74d975 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
Date: Tue, 6 Aug 2024 14:14:27 +0400
Subject: [PATCH 1/5] Fix scanout version with pc-q35-rhel9.4.0
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Marc-André Lureau <marcandre.lureau@redhat.com>
RH-MergeRequest: 383: Fix scanout version with pc-q35-rhel9.4.0
RH-Jira: RHEL-53565
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [1/1] ed2860cfb933654b0046c1b59f78d2e50146bd6c
Resolves: https://issues.redhat.com/browse/RHEL-52940
Introduce hw_compat_rhel_9_4_extra so that pc-q35-rhel9.4.0 has
x-scanout-vmstate-version=1
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
hw/arm/virt.c | 1 +
hw/core/machine.c | 13 +++++++++++--
hw/i386/pc_piix.c | 2 ++
hw/i386/pc_q35.c | 3 +++
hw/s390x/s390-virtio-ccw.c | 1 +
include/hw/boards.h | 3 +++
6 files changed, 21 insertions(+), 2 deletions(-)
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index e4a66affcb..851eff6b28 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -3670,6 +3670,7 @@ type_init(rhel_machine_init);
static void rhel940_virt_options(MachineClass *mc)
{
+ compat_props_add(mc->compat_props, hw_compat_rhel_9_4_extra, hw_compat_rhel_9_4_extra_len);
}
DEFINE_RHEL_MACHINE_AS_LATEST(9, 4, 0)
diff --git a/hw/core/machine.c b/hw/core/machine.c
index c8c460c916..fe0a28ef3b 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -64,6 +64,17 @@ const size_t hw_compat_7_2_len = G_N_ELEMENTS(hw_compat_7_2);
const char *rhel_old_machine_deprecation =
"machine types for previous major releases are deprecated";
+/*
+ * rhel_9_4_extra is used for <= 9.4 machines.
+ *
+ * (for compatibility and historical reasons, rhel_9_4 is used for <= 9.2 too)
+ */
+GlobalProperty hw_compat_rhel_9_4_extra[] = {
+ /* hw_compat_rhel_9_4_extra from hw_compat_8_2 */
+ { "virtio-gpu-device", "x-scanout-vmstate-version", "1" },
+};
+const size_t hw_compat_rhel_9_4_extra_len = G_N_ELEMENTS(hw_compat_rhel_9_4_extra);
+
GlobalProperty hw_compat_rhel_9_4[] = {
/* hw_compat_rhel_9_4 from hw_compat_8_0 */
{ TYPE_VIRTIO_NET, "host_uso", "off"},
@@ -81,8 +92,6 @@ GlobalProperty hw_compat_rhel_9_4[] = {
{ "igb", "x-pcie-flr-init", "off" },
/* hw_compat_rhel_9_4 jira RHEL-24045 */
{ "virtio-mem", "dynamic-memslots", "off" },
- /* hw_compat_rhel_9_4 from hw_compat_8_1 */
- { "virtio-gpu-device", "x-scanout-vmstate-version", "1" },
};
const size_t hw_compat_rhel_9_4_len = G_N_ELEMENTS(hw_compat_rhel_9_4);
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 54d1c58bce..c846673d87 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -1031,6 +1031,8 @@ static void pc_machine_rhel760_options(MachineClass *m)
"Use a different south bridge than PIIX3");
+ compat_props_add(m->compat_props, hw_compat_rhel_9_4_extra,
+ hw_compat_rhel_9_4_extra_len);
compat_props_add(m->compat_props, hw_compat_rhel_9_4,
hw_compat_rhel_9_4_len);
compat_props_add(m->compat_props, hw_compat_rhel_9_3,
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index cd5fb7380e..02bc3d515f 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -731,6 +731,9 @@ static void pc_q35_machine_rhel940_options(MachineClass *m)
m->desc = "RHEL-9.4.0 PC (Q35 + ICH9, 2009)";
pcmc->smbios_stream_product = "RHEL";
pcmc->smbios_stream_version = "9.4.0";
+
+ compat_props_add(m->compat_props, hw_compat_rhel_9_4_extra,
+ hw_compat_rhel_9_4_extra_len);
}
DEFINE_PC_MACHINE(q35_rhel940, "pc-q35-rhel9.4.0", pc_q35_init_rhel940,
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 24f4773179..cc6087c37a 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -1277,6 +1277,7 @@ static void ccw_machine_rhel940_instance_options(MachineState *machine)
static void ccw_machine_rhel940_class_options(MachineClass *mc)
{
+ compat_props_add(mc->compat_props, hw_compat_rhel_9_4_extra, hw_compat_rhel_9_4_extra_len);
}
DEFINE_CCW_MACHINE(rhel940, "rhel9.4.0", true);
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 4edfdb0ddb..e6ae0e61cf 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -505,6 +505,9 @@ extern const size_t hw_compat_2_2_len;
extern GlobalProperty hw_compat_2_1[];
extern const size_t hw_compat_2_1_len;
+extern GlobalProperty hw_compat_rhel_9_4_extra[];
+extern const size_t hw_compat_rhel_9_4_extra_len;
+
extern GlobalProperty hw_compat_rhel_9_4[];
extern const size_t hw_compat_rhel_9_4_len;
--
2.39.3

126
SOURCES/kvm-linux-aio-add-IO_CMD_FDSYNC-command-support.patch Normal file
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@ -0,0 +1,126 @@
From 9d00965910d5a7818ffe55b18d3e9dd4c7210e1b Mon Sep 17 00:00:00 2001
From: Prasad Pandit <pjp@fedoraproject.org>
Date: Thu, 25 Apr 2024 12:34:12 +0530
Subject: [PATCH 4/4] linux-aio: add IO_CMD_FDSYNC command support
RH-Author: Prasad Pandit <None>
RH-MergeRequest: 378: linux-aio: add IO_CMD_FDSYNC command support
RH-Jira: RHEL-43261
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [1/1] 3b80d4a162aad1a87322078a7d7b060a9496035b
Libaio defines IO_CMD_FDSYNC command to sync all outstanding
asynchronous I/O operations, by flushing out file data to the
disk storage. Enable linux-aio to submit such aio request.
When using aio=native without fdsync() support, QEMU creates
pthreads, and destroying these pthreads results in TLB flushes.
In a real-time guest environment, TLB flushes cause a latency
spike. This patch helps to avoid such spikes.
Jira: https://issues.redhat.com/browse/RHEL-43261
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Prasad Pandit <pjp@fedoraproject.org>
Message-ID: <20240425070412.37248-1-ppandit@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 24687abf237e3c15816d689a8e4b08d7c3190dcb)
Signed-off-by: Prasad Pandit <pjp@fedoraproject.org>
---
block/file-posix.c | 9 +++++++++
block/linux-aio.c | 21 ++++++++++++++++++++-
include/block/raw-aio.h | 1 +
3 files changed, 30 insertions(+), 1 deletion(-)
diff --git a/block/file-posix.c b/block/file-posix.c
index 35684f7e21..9831b08fb6 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -159,6 +159,7 @@ typedef struct BDRVRawState {
bool has_discard:1;
bool has_write_zeroes:1;
bool use_linux_aio:1;
+ bool has_laio_fdsync:1;
bool use_linux_io_uring:1;
int page_cache_inconsistent; /* errno from fdatasync failure */
bool has_fallocate;
@@ -718,6 +719,9 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
ret = -EINVAL;
goto fail;
}
+ if (s->use_linux_aio) {
+ s->has_laio_fdsync = laio_has_fdsync(s->fd);
+ }
#else
if (s->use_linux_aio) {
error_setg(errp, "aio=native was specified, but is not supported "
@@ -2599,6 +2603,11 @@ static int coroutine_fn raw_co_flush_to_disk(BlockDriverState *bs)
if (raw_check_linux_io_uring(s)) {
return luring_co_submit(bs, s->fd, 0, NULL, QEMU_AIO_FLUSH);
}
+#endif
+#ifdef CONFIG_LINUX_AIO
+ if (s->has_laio_fdsync && raw_check_linux_aio(s)) {
+ return laio_co_submit(s->fd, 0, NULL, QEMU_AIO_FLUSH, 0);
+ }
#endif
return raw_thread_pool_submit(handle_aiocb_flush, &acb);
}
diff --git a/block/linux-aio.c b/block/linux-aio.c
index ec05d946f3..e3b5ec9aba 100644
--- a/block/linux-aio.c
+++ b/block/linux-aio.c
@@ -384,6 +384,9 @@ static int laio_do_submit(int fd, struct qemu_laiocb *laiocb, off_t offset,
case QEMU_AIO_READ:
io_prep_preadv(iocbs, fd, qiov->iov, qiov->niov, offset);
break;
+ case QEMU_AIO_FLUSH:
+ io_prep_fdsync(iocbs, fd);
+ break;
/* Currently Linux kernel does not support other operations */
default:
fprintf(stderr, "%s: invalid AIO request type 0x%x.\n",
@@ -412,7 +415,7 @@ int coroutine_fn laio_co_submit(int fd, uint64_t offset, QEMUIOVector *qiov,
AioContext *ctx = qemu_get_current_aio_context();
struct qemu_laiocb laiocb = {
.co = qemu_coroutine_self(),
- .nbytes = qiov->size,
+ .nbytes = qiov ? qiov->size : 0,
.ctx = aio_get_linux_aio(ctx),
.ret = -EINPROGRESS,
.is_read = (type == QEMU_AIO_READ),
@@ -486,3 +489,19 @@ void laio_cleanup(LinuxAioState *s)
}
g_free(s);
}
+
+bool laio_has_fdsync(int fd)
+{
+ struct iocb cb;
+ struct iocb *cbs[] = {&cb, NULL};
+
+ io_context_t ctx = 0;
+ io_setup(1, &ctx);
+
+ /* check if host kernel supports IO_CMD_FDSYNC */
+ io_prep_fdsync(&cb, fd);
+ int ret = io_submit(ctx, 1, cbs);
+
+ io_destroy(ctx);
+ return (ret == -EINVAL) ? false : true;
+}
diff --git a/include/block/raw-aio.h b/include/block/raw-aio.h
index 0f63c2800c..3166903a56 100644
--- a/include/block/raw-aio.h
+++ b/include/block/raw-aio.h
@@ -60,6 +60,7 @@ void laio_cleanup(LinuxAioState *s);
int coroutine_fn laio_co_submit(int fd, uint64_t offset, QEMUIOVector *qiov,
int type, uint64_t dev_max_batch);
+bool laio_has_fdsync(int);
void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context);
void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context);
#endif
--
2.39.3

184
SOURCES/kvm-nbd-server-CVE-2024-7409-Cap-default-max-connections.patch Normal file
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@ -0,0 +1,184 @@
From 3311ddaffa78ad8d2c40c86cd69461ebeabe1052 Mon Sep 17 00:00:00 2001
From: Eric Blake <eblake@redhat.com>
Date: Tue, 6 Aug 2024 13:53:00 -0500
Subject: [PATCH 3/5] nbd/server: CVE-2024-7409: Cap default max-connections to
100
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Eric Blake <eblake@redhat.com>
RH-MergeRequest: 386: nbd/server: fix CVE-2024-7409 (qemu crash on nbd-server-stop) [rhel-9.4.z]
RH-Jira: RHEL-52616
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [2/4] 17c9c81282e180485e2f2d584a3e0c73a6fbd66a (ebblake/qemu-kvm)
Allowing an unlimited number of clients to any web service is a recipe
for a rudimentary denial of service attack: the client merely needs to
open lots of sockets without closing them, until qemu no longer has
any more fds available to allocate.
For qemu-nbd, we default to allowing only 1 connection unless more are
explicitly asked for (-e or --shared); this was historically picked as
a nice default (without an explicit -t, a non-persistent qemu-nbd goes
away after a client disconnects, without needing any additional
follow-up commands), and we are not going to change that interface now
(besides, someday we want to point people towards qemu-storage-daemon
instead of qemu-nbd).
But for qemu proper, and the newer qemu-storage-daemon, the QMP
nbd-server-start command has historically had a default of unlimited
number of connections, in part because unlike qemu-nbd it is
inherently persistent until nbd-server-stop. Allowing multiple client
sockets is particularly useful for clients that can take advantage of
MULTI_CONN (creating parallel sockets to increase throughput),
although known clients that do so (such as libnbd's nbdcopy) typically
use only 8 or 16 connections (the benefits of scaling diminish once
more sockets are competing for kernel attention). Picking a number
large enough for typical use cases, but not unlimited, makes it
slightly harder for a malicious client to perform a denial of service
merely by opening lots of connections withot progressing through the
handshake.
This change does not eliminate CVE-2024-7409 on its own, but reduces
the chance for fd exhaustion or unlimited memory usage as an attack
surface. On the other hand, by itself, it makes it more obvious that
with a finite limit, we have the problem of an unauthenticated client
holding 100 fds opened as a way to block out a legitimate client from
being able to connect; thus, later patches will further add timeouts
to reject clients that are not making progress.
This is an INTENTIONAL change in behavior, and will break any client
of nbd-server-start that was not passing an explicit max-connections
parameter, yet expects more than 100 simultaneous connections. We are
not aware of any such client (as stated above, most clients aware of
MULTI_CONN get by just fine on 8 or 16 connections, and probably cope
with later connections failing by relying on the earlier connections;
libvirt has not yet been passing max-connections, but generally
creates NBD servers with the intent for a single client for the sake
of live storage migration; meanwhile, the KubeSAN project anticipates
a large cluster sharing multiple clients [up to 8 per node, and up to
100 nodes in a cluster], but it currently uses qemu-nbd with an
explicit --shared=0 rather than qemu-storage-daemon with
nbd-server-start).
We considered using a deprecation period (declare that omitting
max-parameters is deprecated, and make it mandatory in 3 releases -
then we don't need to pick an arbitrary default); that has zero risk
of breaking any apps that accidentally depended on more than 100
connections, and where such breakage might not be noticed under unit
testing but only under the larger loads of production usage. But it
does not close the denial-of-service hole until far into the future,
and requires all apps to change to add the parameter even if 100 was
good enough. It also has a drawback that any app (like libvirt) that
is accidentally relying on an unlimited default should seriously
consider their own CVE now, at which point they are going to change to
pass explicit max-connections sooner than waiting for 3 qemu releases.
Finally, if our changed default breaks an app, that app can always
pass in an explicit max-parameters with a larger value.
It is also intentional that the HMP interface to nbd-server-start is
not changed to expose max-connections (any client needing to fine-tune
things should be using QMP).
Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-ID: <20240807174943.771624-12-eblake@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
[ericb: Expand commit message to summarize Dan's argument for why we
break corner-case back-compat behavior without a deprecation period]
Signed-off-by: Eric Blake <eblake@redhat.com>
(cherry picked from commit c8a76dbd90c2f48df89b75bef74917f90a59b623)
Jira: https://issues.redhat.com/browse/RHEL-52616
Signed-off-by: Eric Blake <eblake@redhat.com>
---
block/monitor/block-hmp-cmds.c | 3 ++-
blockdev-nbd.c | 8 ++++++++
include/block/nbd.h | 7 +++++++
qapi/block-export.json | 4 ++--
4 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/block/monitor/block-hmp-cmds.c b/block/monitor/block-hmp-cmds.c
index bdbb5cb141..2d7b4d80c8 100644
--- a/block/monitor/block-hmp-cmds.c
+++ b/block/monitor/block-hmp-cmds.c
@@ -402,7 +402,8 @@ void hmp_nbd_server_start(Monitor *mon, const QDict *qdict)
goto exit;
}
- nbd_server_start(addr, NULL, NULL, 0, &local_err);
+ nbd_server_start(addr, NULL, NULL, NBD_DEFAULT_MAX_CONNECTIONS,
+ &local_err);
qapi_free_SocketAddress(addr);
if (local_err != NULL) {
goto exit;
diff --git a/blockdev-nbd.c b/blockdev-nbd.c
index 267a1de903..24ba5382db 100644
--- a/blockdev-nbd.c
+++ b/blockdev-nbd.c
@@ -170,6 +170,10 @@ void nbd_server_start(SocketAddress *addr, const char *tls_creds,
void nbd_server_start_options(NbdServerOptions *arg, Error **errp)
{
+ if (!arg->has_max_connections) {
+ arg->max_connections = NBD_DEFAULT_MAX_CONNECTIONS;
+ }
+
nbd_server_start(arg->addr, arg->tls_creds, arg->tls_authz,
arg->max_connections, errp);
}
@@ -182,6 +186,10 @@ void qmp_nbd_server_start(SocketAddressLegacy *addr,
{
SocketAddress *addr_flat = socket_address_flatten(addr);
+ if (!has_max_connections) {
+ max_connections = NBD_DEFAULT_MAX_CONNECTIONS;
+ }
+
nbd_server_start(addr_flat, tls_creds, tls_authz, max_connections, errp);
qapi_free_SocketAddress(addr_flat);
}
diff --git a/include/block/nbd.h b/include/block/nbd.h
index 1d4d65922d..d4f8b21aec 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -39,6 +39,13 @@ extern const BlockExportDriver blk_exp_nbd;
*/
#define NBD_DEFAULT_HANDSHAKE_MAX_SECS 10
+/*
+ * NBD_DEFAULT_MAX_CONNECTIONS: Number of client sockets to allow at
+ * once; must be large enough to allow a MULTI_CONN-aware client like
+ * nbdcopy to create its typical number of 8-16 sockets.
+ */
+#define NBD_DEFAULT_MAX_CONNECTIONS 100
+
/* Handshake phase structs - this struct is passed on the wire */
typedef struct NBDOption {
diff --git a/qapi/block-export.json b/qapi/block-export.json
index 7874a49ba7..1d255d77e3 100644
--- a/qapi/block-export.json
+++ b/qapi/block-export.json
@@ -28,7 +28,7 @@
# @max-connections: The maximum number of connections to allow at the
# same time, 0 for unlimited. Setting this to 1 also stops the
# server from advertising multiple client support (since 5.2;
-# default: 0)
+# default: 100)
#
# Since: 4.2
##
@@ -63,7 +63,7 @@
# @max-connections: The maximum number of connections to allow at the
# same time, 0 for unlimited. Setting this to 1 also stops the
# server from advertising multiple client support (since 5.2;
-# default: 0).
+# default: 100).
#
# Returns: error if the server is already running.
#
--
2.39.3

173
SOURCES/kvm-nbd-server-CVE-2024-7409-Close-stray-clients-at-serv.patch Normal file
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@ -0,0 +1,173 @@
From 1c2fe81349a99cf0c28549426c7ad0c06d942ae3 Mon Sep 17 00:00:00 2001
From: Eric Blake <eblake@redhat.com>
Date: Wed, 7 Aug 2024 12:23:13 -0500
Subject: [PATCH 5/5] nbd/server: CVE-2024-7409: Close stray clients at
server-stop
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Eric Blake <eblake@redhat.com>
RH-MergeRequest: 386: nbd/server: fix CVE-2024-7409 (qemu crash on nbd-server-stop) [rhel-9.4.z]
RH-Jira: RHEL-52616
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [4/4] 54d56c0d92d92b2b6a0f81a01853881286beae0e (ebblake/qemu-kvm)
A malicious client can attempt to connect to an NBD server, and then
intentionally delay progress in the handshake, including if it does
not know the TLS secrets. Although the previous two patches reduce
this behavior by capping the default max-connections parameter and
killing slow clients, they did not eliminate the possibility of a
client waiting to close the socket until after the QMP nbd-server-stop
command is executed, at which point qemu would SEGV when trying to
dereference the NULL nbd_server global which is no longer present.
This amounts to a denial of service attack. Worse, if another NBD
server is started before the malicious client disconnects, I cannot
rule out additional adverse effects when the old client interferes
with the connection count of the new server (although the most likely
is a crash due to an assertion failure when checking
nbd_server->connections > 0).
For environments without this patch, the CVE can be mitigated by
ensuring (such as via a firewall) that only trusted clients can
connect to an NBD server. Note that using frameworks like libvirt
that ensure that TLS is used and that nbd-server-stop is not executed
while any trusted clients are still connected will only help if there
is also no possibility for an untrusted client to open a connection
but then stall on the NBD handshake.
Given the previous patches, it would be possible to guarantee that no
clients remain connected by having nbd-server-stop sleep for longer
than the default handshake deadline before finally freeing the global
nbd_server object, but that could make QMP non-responsive for a long
time. So intead, this patch fixes the problem by tracking all client
sockets opened while the server is running, and forcefully closing any
such sockets remaining without a completed handshake at the time of
nbd-server-stop, then waiting until the coroutines servicing those
sockets notice the state change. nbd-server-stop now has a second
AIO_WAIT_WHILE_UNLOCKED (the first is indirectly through the
blk_exp_close_all_type() that disconnects all clients that completed
handshakes), but forced socket shutdown is enough to progress the
coroutines and quickly tear down all clients before the server is
freed, thus finally fixing the CVE.
This patch relies heavily on the fact that nbd/server.c guarantees
that it only calls nbd_blockdev_client_closed() from the main loop
(see the assertion in nbd_client_put() and the hoops used in
nbd_client_put_nonzero() to achieve that); if we did not have that
guarantee, we would also need a mutex protecting our accesses of the
list of connections to survive re-entrancy from independent iothreads.
Although I did not actually try to test old builds, it looks like this
problem has existed since at least commit 862172f45c (v2.12.0, 2017) -
even back when that patch started using a QIONetListener to handle
listening on multiple sockets, nbd_server_free() was already unaware
that the nbd_blockdev_client_closed callback can be reached later by a
client thread that has not completed handshakes (and therefore the
client's socket never got added to the list closed in
nbd_export_close_all), despite that patch intentionally tearing down
the QIONetListener to prevent new clients.
Reported-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
Fixes: CVE-2024-7409
CC: qemu-stable@nongnu.org
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-ID: <20240807174943.771624-14-eblake@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
(cherry picked from commit 3e7ef738c8462c45043a1d39f702a0990406a3b3)
Jira: https://issues.redhat.com/browse/RHEL-52616
Signed-off-by: Eric Blake <eblake@redhat.com>
---
blockdev-nbd.c | 35 ++++++++++++++++++++++++++++++++++-
1 file changed, 34 insertions(+), 1 deletion(-)
diff --git a/blockdev-nbd.c b/blockdev-nbd.c
index 24ba5382db..f73409ae49 100644
--- a/blockdev-nbd.c
+++ b/blockdev-nbd.c
@@ -21,12 +21,18 @@
#include "io/channel-socket.h"
#include "io/net-listener.h"
+typedef struct NBDConn {
+ QIOChannelSocket *cioc;
+ QLIST_ENTRY(NBDConn) next;
+} NBDConn;
+
typedef struct NBDServerData {
QIONetListener *listener;
QCryptoTLSCreds *tlscreds;
char *tlsauthz;
uint32_t max_connections;
uint32_t connections;
+ QLIST_HEAD(, NBDConn) conns;
} NBDServerData;
static NBDServerData *nbd_server;
@@ -51,6 +57,14 @@ int nbd_server_max_connections(void)
static void nbd_blockdev_client_closed(NBDClient *client, bool ignored)
{
+ NBDConn *conn = nbd_client_owner(client);
+
+ assert(qemu_in_main_thread() && nbd_server);
+
+ object_unref(OBJECT(conn->cioc));
+ QLIST_REMOVE(conn, next);
+ g_free(conn);
+
nbd_client_put(client);
assert(nbd_server->connections > 0);
nbd_server->connections--;
@@ -60,14 +74,20 @@ static void nbd_blockdev_client_closed(NBDClient *client, bool ignored)
static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
gpointer opaque)
{
+ NBDConn *conn = g_new0(NBDConn, 1);
+
+ assert(qemu_in_main_thread() && nbd_server);
nbd_server->connections++;
+ object_ref(OBJECT(cioc));
+ conn->cioc = cioc;
+ QLIST_INSERT_HEAD(&nbd_server->conns, conn, next);
nbd_update_server_watch(nbd_server);
qio_channel_set_name(QIO_CHANNEL(cioc), "nbd-server");
/* TODO - expose handshake timeout as QMP option */
nbd_client_new(cioc, NBD_DEFAULT_HANDSHAKE_MAX_SECS,
nbd_server->tlscreds, nbd_server->tlsauthz,
- nbd_blockdev_client_closed, NULL);
+ nbd_blockdev_client_closed, conn);
}
static void nbd_update_server_watch(NBDServerData *s)
@@ -81,12 +101,25 @@ static void nbd_update_server_watch(NBDServerData *s)
static void nbd_server_free(NBDServerData *server)
{
+ NBDConn *conn, *tmp;
+
if (!server) {
return;
}
+ /*
+ * Forcefully close the listener socket, and any clients that have
+ * not yet disconnected on their own.
+ */
qio_net_listener_disconnect(server->listener);
object_unref(OBJECT(server->listener));
+ QLIST_FOREACH_SAFE(conn, &server->conns, next, tmp) {
+ qio_channel_shutdown(QIO_CHANNEL(conn->cioc), QIO_CHANNEL_SHUTDOWN_BOTH,
+ NULL);
+ }
+
+ AIO_WAIT_WHILE_UNLOCKED(NULL, server->connections > 0);
+
if (server->tlscreds) {
object_unref(OBJECT(server->tlscreds));
}
--
2.39.3

134
SOURCES/kvm-nbd-server-CVE-2024-7409-Drop-non-negotiating-client.patch Normal file
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@ -0,0 +1,134 @@
From 71c525e45f3f2a421ad651bc50eff94be925b36c Mon Sep 17 00:00:00 2001
From: Eric Blake <eblake@redhat.com>
Date: Thu, 8 Aug 2024 16:05:08 -0500
Subject: [PATCH 4/5] nbd/server: CVE-2024-7409: Drop non-negotiating clients
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Eric Blake <eblake@redhat.com>
RH-MergeRequest: 386: nbd/server: fix CVE-2024-7409 (qemu crash on nbd-server-stop) [rhel-9.4.z]
RH-Jira: RHEL-52616
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [3/4] 4394e60a8733cd57ee6c8cb140171c7f61cc13a3 (ebblake/qemu-kvm)
A client that opens a socket but does not negotiate is merely hogging
qemu's resources (an open fd and a small amount of memory); and a
malicious client that can access the port where NBD is listening can
attempt a denial of service attack by intentionally opening and
abandoning lots of unfinished connections. The previous patch put a
default bound on the number of such ongoing connections, but once that
limit is hit, no more clients can connect (including legitimate ones).
The solution is to insist that clients complete handshake within a
reasonable time limit, defaulting to 10 seconds. A client that has
not successfully completed NBD_OPT_GO by then (including the case of
where the client didn't know TLS credentials to even reach the point
of NBD_OPT_GO) is wasting our time and does not deserve to stay
connected. Later patches will allow fine-tuning the limit away from
the default value (including disabling it for doing integration
testing of the handshake process itself).
Note that this patch in isolation actually makes it more likely to see
qemu SEGV after nbd-server-stop, as any client socket still connected
when the server shuts down will now be closed after 10 seconds rather
than at the client's whims. That will be addressed in the next patch.
For a demo of this patch in action:
$ qemu-nbd -f raw -r -t -e 10 file &
$ nbdsh --opt-mode -c '
H = list()
for i in range(20):
print(i)
H.insert(i, nbd.NBD())
H[i].set_opt_mode(True)
H[i].connect_uri("nbd://localhost")
'
$ kill $!
where later connections get to start progressing once earlier ones are
forcefully dropped for taking too long, rather than hanging.
Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-ID: <20240807174943.771624-13-eblake@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
[eblake: rebase to changes earlier in series, reduce scope of timer]
Signed-off-by: Eric Blake <eblake@redhat.com>
(cherry picked from commit b9b72cb3ce15b693148bd09cef7e50110566d8a0)
Jira: https://issues.redhat.com/browse/RHEL-52616
Signed-off-by: Eric Blake <eblake@redhat.com>
---
nbd/server.c | 28 +++++++++++++++++++++++++++-
nbd/trace-events | 1 +
2 files changed, 28 insertions(+), 1 deletion(-)
diff --git a/nbd/server.c b/nbd/server.c
index e50012499f..39285cc971 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -3186,22 +3186,48 @@ static void nbd_client_receive_next_request(NBDClient *client)
}
}
+static void nbd_handshake_timer_cb(void *opaque)
+{
+ QIOChannel *ioc = opaque;
+
+ trace_nbd_handshake_timer_cb();
+ qio_channel_shutdown(ioc, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
+}
+
static coroutine_fn void nbd_co_client_start(void *opaque)
{
NBDClient *client = opaque;
Error *local_err = NULL;
+ QEMUTimer *handshake_timer = NULL;
qemu_co_mutex_init(&client->send_lock);
- /* TODO - utilize client->handshake_max_secs */
+ /*
+ * Create a timer to bound the time spent in negotiation. If the
+ * timer expires, it is likely nbd_negotiate will fail because the
+ * socket was shutdown.
+ */
+ if (client->handshake_max_secs > 0) {
+ handshake_timer = aio_timer_new(qemu_get_aio_context(),
+ QEMU_CLOCK_REALTIME,
+ SCALE_NS,
+ nbd_handshake_timer_cb,
+ client->sioc);
+ timer_mod(handshake_timer,
+ qemu_clock_get_ns(QEMU_CLOCK_REALTIME) +
+ client->handshake_max_secs * NANOSECONDS_PER_SECOND);
+ }
+
if (nbd_negotiate(client, &local_err)) {
if (local_err) {
error_report_err(local_err);
}
+ timer_free(handshake_timer);
client_close(client, false);
return;
}
+ timer_free(handshake_timer);
WITH_QEMU_LOCK_GUARD(&client->lock) {
nbd_client_receive_next_request(client);
}
diff --git a/nbd/trace-events b/nbd/trace-events
index 00ae3216a1..cbd0a4ab7e 100644
--- a/nbd/trace-events
+++ b/nbd/trace-events
@@ -76,6 +76,7 @@ nbd_co_receive_request_payload_received(uint64_t cookie, uint64_t len) "Payload
nbd_co_receive_ext_payload_compliance(uint64_t from, uint64_t len) "client sent non-compliant write without payload flag: from=0x%" PRIx64 ", len=0x%" PRIx64
nbd_co_receive_align_compliance(const char *op, uint64_t from, uint64_t len, uint32_t align) "client sent non-compliant unaligned %s request: from=0x%" PRIx64 ", len=0x%" PRIx64 ", align=0x%" PRIx32
nbd_trip(void) "Reading request"
+nbd_handshake_timer_cb(void) "client took too long to negotiate"
# client-connection.c
nbd_connect_thread_sleep(uint64_t timeout) "timeout %" PRIu64
--
2.39.3

175
SOURCES/kvm-nbd-server-Plumb-in-new-args-to-nbd_client_add.patch Normal file
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@ -0,0 +1,175 @@
From c8c7dc7a445892a820223be2e7617a790e0400f5 Mon Sep 17 00:00:00 2001
From: Eric Blake <eblake@redhat.com>
Date: Wed, 7 Aug 2024 08:50:01 -0500
Subject: [PATCH 2/5] nbd/server: Plumb in new args to nbd_client_add()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Eric Blake <eblake@redhat.com>
RH-MergeRequest: 386: nbd/server: fix CVE-2024-7409 (qemu crash on nbd-server-stop) [rhel-9.4.z]
RH-Jira: RHEL-52616
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [1/4] 658d80c80a1163fcad456a34ec20d7828273a36c (ebblake/qemu-kvm)
Upcoming patches to fix a CVE need to track an opaque pointer passed
in by the owner of a client object, as well as request for a time
limit on how fast negotiation must complete. Prepare for that by
changing the signature of nbd_client_new() and adding an accessor to
get at the opaque pointer, although for now the two servers
(qemu-nbd.c and blockdev-nbd.c) do not change behavior even though
they pass in a new default timeout value.
Suggested-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-ID: <20240807174943.771624-11-eblake@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
[eblake: s/LIMIT/MAX_SECS/ as suggested by Dan]
Signed-off-by: Eric Blake <eblake@redhat.com>
(cherry picked from commit fb1c2aaa981e0a2fa6362c9985f1296b74f055ac)
Jira: https://issues.redhat.com/browse/RHEL-52616
Signed-off-by: Eric Blake <eblake@redhat.com>
---
blockdev-nbd.c | 6 ++++--
include/block/nbd.h | 11 ++++++++++-
nbd/server.c | 20 +++++++++++++++++---
qemu-nbd.c | 4 +++-
4 files changed, 34 insertions(+), 7 deletions(-)
diff --git a/blockdev-nbd.c b/blockdev-nbd.c
index 213012435f..267a1de903 100644
--- a/blockdev-nbd.c
+++ b/blockdev-nbd.c
@@ -64,8 +64,10 @@ static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
nbd_update_server_watch(nbd_server);
qio_channel_set_name(QIO_CHANNEL(cioc), "nbd-server");
- nbd_client_new(cioc, nbd_server->tlscreds, nbd_server->tlsauthz,
- nbd_blockdev_client_closed);
+ /* TODO - expose handshake timeout as QMP option */
+ nbd_client_new(cioc, NBD_DEFAULT_HANDSHAKE_MAX_SECS,
+ nbd_server->tlscreds, nbd_server->tlsauthz,
+ nbd_blockdev_client_closed, NULL);
}
static void nbd_update_server_watch(NBDServerData *s)
diff --git a/include/block/nbd.h b/include/block/nbd.h
index 4e7bd6342f..1d4d65922d 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -33,6 +33,12 @@ typedef struct NBDMetaContexts NBDMetaContexts;
extern const BlockExportDriver blk_exp_nbd;
+/*
+ * NBD_DEFAULT_HANDSHAKE_MAX_SECS: Number of seconds in which client must
+ * succeed at NBD_OPT_GO before being forcefully dropped as too slow.
+ */
+#define NBD_DEFAULT_HANDSHAKE_MAX_SECS 10
+
/* Handshake phase structs - this struct is passed on the wire */
typedef struct NBDOption {
@@ -403,9 +409,12 @@ AioContext *nbd_export_aio_context(NBDExport *exp);
NBDExport *nbd_export_find(const char *name);
void nbd_client_new(QIOChannelSocket *sioc,
+ uint32_t handshake_max_secs,
QCryptoTLSCreds *tlscreds,
const char *tlsauthz,
- void (*close_fn)(NBDClient *, bool));
+ void (*close_fn)(NBDClient *, bool),
+ void *owner);
+void *nbd_client_owner(NBDClient *client);
void nbd_client_get(NBDClient *client);
void nbd_client_put(NBDClient *client);
diff --git a/nbd/server.c b/nbd/server.c
index 892797bb11..e50012499f 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -124,12 +124,14 @@ struct NBDMetaContexts {
struct NBDClient {
int refcount; /* atomic */
void (*close_fn)(NBDClient *client, bool negotiated);
+ void *owner;
QemuMutex lock;
NBDExport *exp;
QCryptoTLSCreds *tlscreds;
char *tlsauthz;
+ uint32_t handshake_max_secs;
QIOChannelSocket *sioc; /* The underlying data channel */
QIOChannel *ioc; /* The current I/O channel which may differ (eg TLS) */
@@ -3191,6 +3193,7 @@ static coroutine_fn void nbd_co_client_start(void *opaque)
qemu_co_mutex_init(&client->send_lock);
+ /* TODO - utilize client->handshake_max_secs */
if (nbd_negotiate(client, &local_err)) {
if (local_err) {
error_report_err(local_err);
@@ -3205,14 +3208,17 @@ static coroutine_fn void nbd_co_client_start(void *opaque)
}
/*
- * Create a new client listener using the given channel @sioc.
+ * Create a new client listener using the given channel @sioc and @owner.
* Begin servicing it in a coroutine. When the connection closes, call
- * @close_fn with an indication of whether the client completed negotiation.
+ * @close_fn with an indication of whether the client completed negotiation
+ * within @handshake_max_secs seconds (0 for unbounded).
*/
void nbd_client_new(QIOChannelSocket *sioc,
+ uint32_t handshake_max_secs,
QCryptoTLSCreds *tlscreds,
const char *tlsauthz,
- void (*close_fn)(NBDClient *, bool))
+ void (*close_fn)(NBDClient *, bool),
+ void *owner)
{
NBDClient *client;
Coroutine *co;
@@ -3225,13 +3231,21 @@ void nbd_client_new(QIOChannelSocket *sioc,
object_ref(OBJECT(client->tlscreds));
}
client->tlsauthz = g_strdup(tlsauthz);
+ client->handshake_max_secs = handshake_max_secs;
client->sioc = sioc;
qio_channel_set_delay(QIO_CHANNEL(sioc), false);
object_ref(OBJECT(client->sioc));
client->ioc = QIO_CHANNEL(sioc);
object_ref(OBJECT(client->ioc));
client->close_fn = close_fn;
+ client->owner = owner;
co = qemu_coroutine_create(nbd_co_client_start, client);
qemu_coroutine_enter(co);
}
+
+void *
+nbd_client_owner(NBDClient *client)
+{
+ return client->owner;
+}
diff --git a/qemu-nbd.c b/qemu-nbd.c
index bac0b5e3ec..01b4a63c31 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -389,7 +389,9 @@ static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
nb_fds++;
nbd_update_server_watch();
- nbd_client_new(cioc, tlscreds, tlsauthz, nbd_client_closed);
+ /* TODO - expose handshake timeout as command line option */
+ nbd_client_new(cioc, NBD_DEFAULT_HANDSHAKE_MAX_SECS,
+ tlscreds, tlsauthz, nbd_client_closed, NULL);
}
static void nbd_update_server_watch(void)
--
2.39.3

38
SOURCES/kvm-rhel-9.4.0-machine-type-compat-for-virtio-gpu-migrat.patch Normal file
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@ -0,0 +1,38 @@
From aa0ad36a56cbc0528306e47112081b0db124e512 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
Date: Wed, 5 Jun 2024 10:28:20 +0400
Subject: [PATCH 3/4] rhel 9.4.0 machine type compat for virtio-gpu migration
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Marc-André Lureau <marcandre.lureau@redhat.com>
RH-MergeRequest: 377: virtio-gpu: fix scanout migration post-load
RH-Jira: RHEL-36181
RH-Acked-by: Peter Xu <peterx@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [3/3] 270e932e04eb2d730550f3a56b53cbb17f5e66f8
Jira: https://issues.redhat.com/browse/RHEL-36181
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
hw/core/machine.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/hw/core/machine.c b/hw/core/machine.c
index a0843ab93e..c8c460c916 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -81,6 +81,8 @@ GlobalProperty hw_compat_rhel_9_4[] = {
{ "igb", "x-pcie-flr-init", "off" },
/* hw_compat_rhel_9_4 jira RHEL-24045 */
{ "virtio-mem", "dynamic-memslots", "off" },
+ /* hw_compat_rhel_9_4 from hw_compat_8_1 */
+ { "virtio-gpu-device", "x-scanout-vmstate-version", "1" },
};
const size_t hw_compat_rhel_9_4_len = G_N_ELEMENTS(hw_compat_rhel_9_4);
--
2.39.3

196
SOURCES/kvm-virtio-gpu-fix-scanout-migration-post-load.patch Normal file
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@ -0,0 +1,196 @@
From 523423436e83b01a83c60bc44bd08471992aaff4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
Date: Mon, 15 Jan 2024 16:34:33 +0400
Subject: [PATCH 1/4] virtio-gpu: fix scanout migration post-load
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Marc-André Lureau <marcandre.lureau@redhat.com>
RH-MergeRequest: 377: virtio-gpu: fix scanout migration post-load
RH-Jira: RHEL-36181
RH-Acked-by: Peter Xu <peterx@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [1/3] 05e9dbf7f602d62ec2f336a855daf57e6ee8f3f3
The current post-loading code for scanout has a FIXME: it doesn't take
the resource region/rect into account. But there is more, when adding
blob migration support in commit f66767f75c9, I didn't realize that blob
resources could be used for scanouts. This situationn leads to a crash
during post-load, as they don't have an associated res->image.
virtio_gpu_do_set_scanout() handle all cases, but requires the
associated virtio_gpu_framebuffer, which is currently not saved during
migration.
Add a v2 of "virtio-gpu-one-scanout" with the framebuffer fields, so we
can restore blob scanouts, as well as fixing the existing FIXME.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Sebastian Ott <sebott@redhat.com>
(cherry picked from commit dfcf74fa68c88233209aafc5f82728d0b9a1af5c)
---
hw/display/virtio-gpu.c | 55 +++++++++++++++++++++++++++-------
include/hw/virtio/virtio-gpu.h | 1 +
2 files changed, 46 insertions(+), 10 deletions(-)
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 1702190ead..bc485d60ea 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -598,6 +598,7 @@ static void virtio_unref_resource(pixman_image_t *image, void *data)
static void virtio_gpu_update_scanout(VirtIOGPU *g,
uint32_t scanout_id,
struct virtio_gpu_simple_resource *res,
+ struct virtio_gpu_framebuffer *fb,
struct virtio_gpu_rect *r)
{
struct virtio_gpu_simple_resource *ores;
@@ -615,9 +616,10 @@ static void virtio_gpu_update_scanout(VirtIOGPU *g,
scanout->y = r->y;
scanout->width = r->width;
scanout->height = r->height;
+ scanout->fb = *fb;
}
-static void virtio_gpu_do_set_scanout(VirtIOGPU *g,
+static bool virtio_gpu_do_set_scanout(VirtIOGPU *g,
uint32_t scanout_id,
struct virtio_gpu_framebuffer *fb,
struct virtio_gpu_simple_resource *res,
@@ -643,7 +645,7 @@ static void virtio_gpu_do_set_scanout(VirtIOGPU *g,
r->x, r->y, r->width, r->height,
fb->width, fb->height);
*error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
- return;
+ return false;
}
g->parent_obj.enable = 1;
@@ -651,11 +653,12 @@ static void virtio_gpu_do_set_scanout(VirtIOGPU *g,
if (res->blob) {
if (console_has_gl(scanout->con)) {
if (!virtio_gpu_update_dmabuf(g, scanout_id, res, fb, r)) {
- virtio_gpu_update_scanout(g, scanout_id, res, r);
+ virtio_gpu_update_scanout(g, scanout_id, res, fb, r);
} else {
*error = VIRTIO_GPU_RESP_ERR_OUT_OF_MEMORY;
+ return false;
}
- return;
+ return true;
}
data = res->blob;
@@ -684,7 +687,7 @@ static void virtio_gpu_do_set_scanout(VirtIOGPU *g,
scanout->ds = qemu_create_displaysurface_pixman(rect);
if (!scanout->ds) {
*error = VIRTIO_GPU_RESP_ERR_UNSPEC;
- return;
+ return false;
}
#ifdef WIN32
qemu_displaysurface_win32_set_handle(scanout->ds, res->handle, fb->offset);
@@ -695,7 +698,8 @@ static void virtio_gpu_do_set_scanout(VirtIOGPU *g,
scanout->ds);
}
- virtio_gpu_update_scanout(g, scanout_id, res, r);
+ virtio_gpu_update_scanout(g, scanout_id, res, fb, r);
+ return true;
}
static void virtio_gpu_set_scanout(VirtIOGPU *g,
@@ -1166,8 +1170,9 @@ static void virtio_gpu_cursor_bh(void *opaque)
static const VMStateDescription vmstate_virtio_gpu_scanout = {
.name = "virtio-gpu-one-scanout",
- .version_id = 1,
- .fields = (VMStateField[]) {
+ .version_id = 2,
+ .minimum_version_id = 1,
+ .fields = (const VMStateField[]) {
VMSTATE_UINT32(resource_id, struct virtio_gpu_scanout),
VMSTATE_UINT32(width, struct virtio_gpu_scanout),
VMSTATE_UINT32(height, struct virtio_gpu_scanout),
@@ -1178,6 +1183,12 @@ static const VMStateDescription vmstate_virtio_gpu_scanout = {
VMSTATE_UINT32(cursor.hot_y, struct virtio_gpu_scanout),
VMSTATE_UINT32(cursor.pos.x, struct virtio_gpu_scanout),
VMSTATE_UINT32(cursor.pos.y, struct virtio_gpu_scanout),
+ VMSTATE_UINT32_V(fb.format, struct virtio_gpu_scanout, 2),
+ VMSTATE_UINT32_V(fb.bytes_pp, struct virtio_gpu_scanout, 2),
+ VMSTATE_UINT32_V(fb.width, struct virtio_gpu_scanout, 2),
+ VMSTATE_UINT32_V(fb.height, struct virtio_gpu_scanout, 2),
+ VMSTATE_UINT32_V(fb.stride, struct virtio_gpu_scanout, 2),
+ VMSTATE_UINT32_V(fb.offset, struct virtio_gpu_scanout, 2),
VMSTATE_END_OF_LIST()
},
};
@@ -1349,6 +1360,7 @@ static int virtio_gpu_blob_save(QEMUFile *f, void *opaque, size_t size,
if (!res->blob_size) {
continue;
}
+ assert(!res->image);
qemu_put_be32(f, res->resource_id);
qemu_put_be32(f, res->blob_size);
qemu_put_be32(f, res->iov_cnt);
@@ -1411,11 +1423,11 @@ static int virtio_gpu_post_load(void *opaque, int version_id)
int i;
for (i = 0; i < g->parent_obj.conf.max_outputs; i++) {
- /* FIXME: should take scanout.r.{x,y} into account */
scanout = &g->parent_obj.scanout[i];
if (!scanout->resource_id) {
continue;
}
+
res = virtio_gpu_find_resource(g, scanout->resource_id);
if (!res) {
return -EINVAL;
@@ -1428,7 +1440,30 @@ static int virtio_gpu_post_load(void *opaque, int version_id)
qemu_displaysurface_win32_set_handle(scanout->ds, res->handle, 0);
#endif
- dpy_gfx_replace_surface(scanout->con, scanout->ds);
+ if (scanout->fb.format != 0) {
+ uint32_t error = 0;
+ struct virtio_gpu_rect r = {
+ .x = scanout->x,
+ .y = scanout->y,
+ .width = scanout->width,
+ .height = scanout->height
+ };
+
+ if (!virtio_gpu_do_set_scanout(g, i, &scanout->fb, res, &r, &error)) {
+ return -EINVAL;
+ }
+ } else {
+ /* legacy v1 migration support */
+ if (!res->image) {
+ return -EINVAL;
+ }
+ scanout->ds = qemu_create_displaysurface_pixman(res->image);
+#ifdef WIN32
+ qemu_displaysurface_win32_set_handle(scanout->ds, res->handle, 0);
+#endif
+ dpy_gfx_replace_surface(scanout->con, scanout->ds);
+ }
+
dpy_gfx_update_full(scanout->con);
if (scanout->cursor.resource_id) {
update_cursor(g, &scanout->cursor);
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index 584ba2ed73..9a13afb34e 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -81,6 +81,7 @@ struct virtio_gpu_scanout {
uint32_t resource_id;
struct virtio_gpu_update_cursor cursor;
QEMUCursor *current_cursor;
+ struct virtio_gpu_framebuffer fb;
};
struct virtio_gpu_requested_state {
--
2.39.3

122
SOURCES/kvm-virtio-gpu-fix-v2-migration.patch Normal file
View File

@ -0,0 +1,122 @@
From 7741a7d1c1d719ff681f73a023f27d5951b98882 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
Date: Thu, 16 May 2024 12:40:22 +0400
Subject: [PATCH 2/4] virtio-gpu: fix v2 migration
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Marc-André Lureau <marcandre.lureau@redhat.com>
RH-MergeRequest: 377: virtio-gpu: fix scanout migration post-load
RH-Jira: RHEL-36181
RH-Acked-by: Peter Xu <peterx@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [2/3] 482c37c10ac7e5e8a6c36ac2eb806ac02beeefdc
Commit dfcf74fa ("virtio-gpu: fix scanout migration post-load") broke
forward/backward version migration. Versioning of nested VMSD structures
is not straightforward, as the wire format doesn't have nested
structures versions. Introduce x-scanout-vmstate-version and a field
test to save/load appropriately according to the machine version.
Fixes: dfcf74fa ("virtio-gpu: fix scanout migration post-load")
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Fiona Ebner <f.ebner@proxmox.com>
Tested-by: Fiona Ebner <f.ebner@proxmox.com>
[fixed long lines]
Signed-off-by: Fabiano Rosas <farosas@suse.de>
[ Move the hw-compat from 8.2 to 8.1 ]
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
(cherry picked from commit 40a23ef643664b5c1021a9789f9d680b6294fb50)
---
hw/core/machine.c | 1 +
hw/display/virtio-gpu.c | 30 ++++++++++++++++++++++--------
include/hw/virtio/virtio-gpu.h | 1 +
3 files changed, 24 insertions(+), 8 deletions(-)
diff --git a/hw/core/machine.c b/hw/core/machine.c
index 309f6ba685..a0843ab93e 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -37,6 +37,7 @@ GlobalProperty hw_compat_8_1[] = {
{ "ramfb", "x-migrate", "off" },
{ "vfio-pci-nohotplug", "x-ramfb-migrate", "off" },
{ "igb", "x-pcie-flr-init", "off" },
+ { "virtio-gpu-device", "x-scanout-vmstate-version", "1" },
};
const size_t hw_compat_8_1_len = G_N_ELEMENTS(hw_compat_8_1);
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index bc485d60ea..9d35a016ae 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -1168,10 +1168,17 @@ static void virtio_gpu_cursor_bh(void *opaque)
virtio_gpu_handle_cursor(&g->parent_obj.parent_obj, g->cursor_vq);
}
+static bool scanout_vmstate_after_v2(void *opaque, int version)
+{
+ struct VirtIOGPUBase *base = container_of(opaque, VirtIOGPUBase, scanout);
+ struct VirtIOGPU *gpu = container_of(base, VirtIOGPU, parent_obj);
+
+ return gpu->scanout_vmstate_version >= 2;
+}
+
static const VMStateDescription vmstate_virtio_gpu_scanout = {
.name = "virtio-gpu-one-scanout",
- .version_id = 2,
- .minimum_version_id = 1,
+ .version_id = 1,
.fields = (const VMStateField[]) {
VMSTATE_UINT32(resource_id, struct virtio_gpu_scanout),
VMSTATE_UINT32(width, struct virtio_gpu_scanout),
@@ -1183,12 +1190,18 @@ static const VMStateDescription vmstate_virtio_gpu_scanout = {
VMSTATE_UINT32(cursor.hot_y, struct virtio_gpu_scanout),
VMSTATE_UINT32(cursor.pos.x, struct virtio_gpu_scanout),
VMSTATE_UINT32(cursor.pos.y, struct virtio_gpu_scanout),
- VMSTATE_UINT32_V(fb.format, struct virtio_gpu_scanout, 2),
- VMSTATE_UINT32_V(fb.bytes_pp, struct virtio_gpu_scanout, 2),
- VMSTATE_UINT32_V(fb.width, struct virtio_gpu_scanout, 2),
- VMSTATE_UINT32_V(fb.height, struct virtio_gpu_scanout, 2),
- VMSTATE_UINT32_V(fb.stride, struct virtio_gpu_scanout, 2),
- VMSTATE_UINT32_V(fb.offset, struct virtio_gpu_scanout, 2),
+ VMSTATE_UINT32_TEST(fb.format, struct virtio_gpu_scanout,
+ scanout_vmstate_after_v2),
+ VMSTATE_UINT32_TEST(fb.bytes_pp, struct virtio_gpu_scanout,
+ scanout_vmstate_after_v2),
+ VMSTATE_UINT32_TEST(fb.width, struct virtio_gpu_scanout,
+ scanout_vmstate_after_v2),
+ VMSTATE_UINT32_TEST(fb.height, struct virtio_gpu_scanout,
+ scanout_vmstate_after_v2),
+ VMSTATE_UINT32_TEST(fb.stride, struct virtio_gpu_scanout,
+ scanout_vmstate_after_v2),
+ VMSTATE_UINT32_TEST(fb.offset, struct virtio_gpu_scanout,
+ scanout_vmstate_after_v2),
VMSTATE_END_OF_LIST()
},
};
@@ -1668,6 +1681,7 @@ static Property virtio_gpu_properties[] = {
DEFINE_PROP_BIT("blob", VirtIOGPU, parent_obj.conf.flags,
VIRTIO_GPU_FLAG_BLOB_ENABLED, false),
DEFINE_PROP_SIZE("hostmem", VirtIOGPU, parent_obj.conf.hostmem, 0),
+ DEFINE_PROP_UINT8("x-scanout-vmstate-version", VirtIOGPU, scanout_vmstate_version, 2),
DEFINE_PROP_END_OF_LIST(),
};
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index 9a13afb34e..18500432c6 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -177,6 +177,7 @@ typedef struct VGPUDMABuf {
struct VirtIOGPU {
VirtIOGPUBase parent_obj;
+ uint8_t scanout_vmstate_version;
uint64_t conf_max_hostmem;
VirtQueue *ctrl_vq;
--
2.39.3

41
SPECS/qemu-kvm.spec
View File

@ -149,7 +149,7 @@ Obsoletes: %{name}-block-ssh <= %{epoch}:%{version} \
Summary: QEMU is a machine emulator and virtualizer Summary: QEMU is a machine emulator and virtualizer
Name: qemu-kvm Name: qemu-kvm
Version: 8.2.0 Version: 8.2.0
Release: 11%{?rcrel}%{?dist}%{?cc_suffix}.4 Release: 11%{?rcrel}%{?dist}%{?cc_suffix}.6
# Epoch because we pushed a qemu-1.0 package. AIUI this can't ever be dropped # Epoch because we pushed a qemu-1.0 package. AIUI this can't ever be dropped
# Epoch 15 used for RHEL 8 # Epoch 15 used for RHEL 8
# Epoch 17 used for RHEL 9 (due to release versioning offset in RHEL 8.5) # Epoch 17 used for RHEL 9 (due to release versioning offset in RHEL 8.5)
@ -630,6 +630,24 @@ Patch185: kvm-iotests-244-Don-t-store-data-file-with-protocol-in-i.patch
Patch186: kvm-iotests-270-Don-t-store-data-file-with-json-prefix-i.patch Patch186: kvm-iotests-270-Don-t-store-data-file-with-json-prefix-i.patch
# For RHEL-35610 # For RHEL-35610
Patch187: kvm-block-Parse-filenames-only-when-explicitly-requested.patch Patch187: kvm-block-Parse-filenames-only-when-explicitly-requested.patch
# For RHEL-36181 - [RHEL9.5.0][stable_guest_abi]Failed to migrate VM with (qemu) qemu-kvm: Missing section footer for 0000:00:01.0/virtio-gpu qemu-kvm: load of migration failed: Invalid argument [rhel-9.4.0.z]
Patch188: kvm-virtio-gpu-fix-scanout-migration-post-load.patch
# For RHEL-36181 - [RHEL9.5.0][stable_guest_abi]Failed to migrate VM with (qemu) qemu-kvm: Missing section footer for 0000:00:01.0/virtio-gpu qemu-kvm: load of migration failed: Invalid argument [rhel-9.4.0.z]
Patch189: kvm-virtio-gpu-fix-v2-migration.patch
# For RHEL-36181 - [RHEL9.5.0][stable_guest_abi]Failed to migrate VM with (qemu) qemu-kvm: Missing section footer for 0000:00:01.0/virtio-gpu qemu-kvm: load of migration failed: Invalid argument [rhel-9.4.0.z]
Patch190: kvm-rhel-9.4.0-machine-type-compat-for-virtio-gpu-migrat.patch
# For RHEL-43261 - qemu-kvm: linux-aio: add support for IO_CMD_FDSYNC command [rhel-9.4.z]
Patch191: kvm-linux-aio-add-IO_CMD_FDSYNC-command-support.patch
# For RHEL-53565 - [RHEL9.4_to_RHEL9.5]When the VM is with only 9.4.0 (q35) machine type, still hit error of virtio-gpu issue [rhel-9.4.z]
Patch192: kvm-Fix-scanout-version-with-pc-q35-rhel9.4.0.patch
# For RHEL-52616 - CVE-2024-7409 qemu-kvm: Denial of Service via Improper Synchronization in QEMU NBD Server During Socket Closure [rhel-9.4.z]
Patch193: kvm-nbd-server-Plumb-in-new-args-to-nbd_client_add.patch
# For RHEL-52616 - CVE-2024-7409 qemu-kvm: Denial of Service via Improper Synchronization in QEMU NBD Server During Socket Closure [rhel-9.4.z]
Patch194: kvm-nbd-server-CVE-2024-7409-Cap-default-max-connections.patch
# For RHEL-52616 - CVE-2024-7409 qemu-kvm: Denial of Service via Improper Synchronization in QEMU NBD Server During Socket Closure [rhel-9.4.z]
Patch195: kvm-nbd-server-CVE-2024-7409-Drop-non-negotiating-client.patch
# For RHEL-52616 - CVE-2024-7409 qemu-kvm: Denial of Service via Improper Synchronization in QEMU NBD Server During Socket Closure [rhel-9.4.z]
Patch196: kvm-nbd-server-CVE-2024-7409-Close-stray-clients-at-serv.patch
%if %{have_clang} %if %{have_clang}
BuildRequires: clang BuildRequires: clang
@ -1691,6 +1709,27 @@ useradd -r -u 107 -g qemu -G kvm -d / -s /sbin/nologin \
%endif %endif
%changelog %changelog
* Thu Aug 15 2024 Miroslav Rezanina <mrezanin@redhat.com> - 8.2.0-11.el9_4.6
- kvm-Fix-scanout-version-with-pc-q35-rhel9.4.0.patch [RHEL-53565]
- kvm-nbd-server-Plumb-in-new-args-to-nbd_client_add.patch [RHEL-52616]
- kvm-nbd-server-CVE-2024-7409-Cap-default-max-connections.patch [RHEL-52616]
- kvm-nbd-server-CVE-2024-7409-Drop-non-negotiating-client.patch [RHEL-52616]
- kvm-nbd-server-CVE-2024-7409-Close-stray-clients-at-serv.patch [RHEL-52616]
- Resolves: RHEL-53565
([RHEL9.4_to_RHEL9.5]When the VM is with only 9.4.0 (q35) machine type, still hit error of virtio-gpu issue [rhel-9.4.z])
- Resolves: RHEL-52616
(CVE-2024-7409 qemu-kvm: Denial of Service via Improper Synchronization in QEMU NBD Server During Socket Closure [rhel-9.4.z])
* Mon Jul 15 2024 Miroslav Rezanina <mrezanin@redhat.com> - 8.2.0-11.el9_4.5
- kvm-virtio-gpu-fix-scanout-migration-post-load.patch [RHEL-36181]
- kvm-virtio-gpu-fix-v2-migration.patch [RHEL-36181]
- kvm-rhel-9.4.0-machine-type-compat-for-virtio-gpu-migrat.patch [RHEL-36181]
- kvm-linux-aio-add-IO_CMD_FDSYNC-command-support.patch [RHEL-43261]
- Resolves: RHEL-36181
([RHEL9.5.0][stable_guest_abi]Failed to migrate VM with (qemu) qemu-kvm: Missing section footer for 0000:00:01.0/virtio-gpu qemu-kvm: load of migration failed: Invalid argument [rhel-9.4.0.z])
- Resolves: RHEL-43261
(qemu-kvm: linux-aio: add support for IO_CMD_FDSYNC command [rhel-9.4.z])
* Wed Jun 19 2024 Miroslav Rezanina <mrezanin@redhat.com> - 8.2.0-11.el9_4.4 * Wed Jun 19 2024 Miroslav Rezanina <mrezanin@redhat.com> - 8.2.0-11.el9_4.4
- Fixing CVE-2024-4467 - Fixing CVE-2024-4467
- Resolves: RHEL-35610 - Resolves: RHEL-35610