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qemu-kvm/SOURCES/kvm-io-remove-io-watch-if-T...

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From c13b4e32be9de900e7a55ebf5c341df8363e3b4a Mon Sep 17 00:00:00 2001
From: Jon Maloy <jmaloy@redhat.com>
Date: Tue, 15 Aug 2023 00:08:55 +0000
Subject: [PATCH 4/4] io: remove io watch if TLS channel is closed during
handshake
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Jon Maloy <jmaloy@redhat.com>
RH-MergeRequest: 301: io: remove io watch if TLS channel is closed during handshake
RH-Bugzilla: 2216503
RH-Acked-by: Peter Xu <peterx@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Commit: [1/1] 10bc3055a369a89996a1be34ce8d6c1fbc2c531e (redhat/rhel/src/qemu-kvm/jons-qemu-kvm-2)
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2216503
CVE: CVE-2023-3354
Upstream: Merged
commit 10be627d2b5ec2d6b3dce045144aa739eef678b4
Author: Daniel P. Berrangé <berrange@redhat.com>
Date: Tue Jun 20 09:45:34 2023 +0100
io: remove io watch if TLS channel is closed during handshake
The TLS handshake make take some time to complete, during which time an
I/O watch might be registered with the main loop. If the owner of the
I/O channel invokes qio_channel_close() while the handshake is waiting
to continue the I/O watch must be removed. Failing to remove it will
later trigger the completion callback which the owner is not expecting
to receive. In the case of the VNC server, this results in a SEGV as
vnc_disconnect_start() tries to shutdown a client connection that is
already gone / NULL.
CVE-2023-3354
Reported-by: jiangyegen <jiangyegen@huawei.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
---
include/io/channel-tls.h | 1 +
io/channel-tls.c | 18 ++++++++++++------
2 files changed, 13 insertions(+), 6 deletions(-)
diff --git a/include/io/channel-tls.h b/include/io/channel-tls.h
index 5672479e9e..26c67f17e2 100644
--- a/include/io/channel-tls.h
+++ b/include/io/channel-tls.h
@@ -48,6 +48,7 @@ struct QIOChannelTLS {
QIOChannel *master;
QCryptoTLSSession *session;
QIOChannelShutdown shutdown;
+ guint hs_ioc_tag;
};
/**
diff --git a/io/channel-tls.c b/io/channel-tls.c
index c730cb8ec5..bd79e78837 100644
--- a/io/channel-tls.c
+++ b/io/channel-tls.c
@@ -195,12 +195,13 @@ static void qio_channel_tls_handshake_task(QIOChannelTLS *ioc,
}
trace_qio_channel_tls_handshake_pending(ioc, status);
- qio_channel_add_watch_full(ioc->master,
- condition,
- qio_channel_tls_handshake_io,
- data,
- NULL,
- context);
+ ioc->hs_ioc_tag =
+ qio_channel_add_watch_full(ioc->master,
+ condition,
+ qio_channel_tls_handshake_io,
+ data,
+ NULL,
+ context);
}
}
@@ -215,6 +216,7 @@ static gboolean qio_channel_tls_handshake_io(QIOChannel *ioc,
QIOChannelTLS *tioc = QIO_CHANNEL_TLS(
qio_task_get_source(task));
+ tioc->hs_ioc_tag = 0;
g_free(data);
qio_channel_tls_handshake_task(tioc, task, context);
@@ -375,6 +377,10 @@ static int qio_channel_tls_close(QIOChannel *ioc,
{
QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
+ if (tioc->hs_ioc_tag) {
+ g_clear_handle_id(&tioc->hs_ioc_tag, g_source_remove);
+ }
+
return qio_channel_close(tioc->master, errp);
}
--
2.39.3