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-rw-r--r--gnu/packages/patches/qemu-CVE-2017-15268.patch62
1 files changed, 62 insertions, 0 deletions
diff --git a/gnu/packages/patches/qemu-CVE-2017-15268.patch b/gnu/packages/patches/qemu-CVE-2017-15268.patch
new file mode 100644
index 0000000000..8238c3059f
--- /dev/null
+++ b/gnu/packages/patches/qemu-CVE-2017-15268.patch
@@ -0,0 +1,62 @@
+Fix CVE-2017-15268:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-15268
+
+Patch copied from upstream source repository:
+
+https://git.qemu.org/?p=qemu.git;a=commitdiff;h=a7b20a8efa28e5f22c26c06cd06c2f12bc863493
+
+From a7b20a8efa28e5f22c26c06cd06c2f12bc863493 Mon Sep 17 00:00:00 2001
+From: "Daniel P. Berrange" <berrange@redhat.com>
+Date: Mon, 9 Oct 2017 14:43:42 +0100
+Subject: [PATCH] io: monitor encoutput buffer size from websocket GSource
+
+The websocket GSource is monitoring the size of the rawoutput
+buffer to determine if the channel can accepts more writes.
+The rawoutput buffer, however, is merely a temporary staging
+buffer before data is copied into the encoutput buffer. Thus
+its size will always be zero when the GSource runs.
+
+This flaw causes the encoutput buffer to grow without bound
+if the other end of the underlying data channel doesn't
+read data being sent. This can be seen with VNC if a client
+is on a slow WAN link and the guest OS is sending many screen
+updates. A malicious VNC client can act like it is on a slow
+link by playing a video in the guest and then reading data
+very slowly, causing QEMU host memory to expand arbitrarily.
+
+This issue is assigned CVE-2017-15268, publically reported in
+
+ https://bugs.launchpad.net/qemu/+bug/1718964
+
+Reviewed-by: Eric Blake <eblake@redhat.com>
+Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
+---
+ io/channel-websock.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/io/channel-websock.c b/io/channel-websock.c
+index d1d471f86e..04bcc059cd 100644
+--- a/io/channel-websock.c
++++ b/io/channel-websock.c
+@@ -28,7 +28,7 @@
+ #include <time.h>
+
+
+-/* Max amount to allow in rawinput/rawoutput buffers */
++/* Max amount to allow in rawinput/encoutput buffers */
+ #define QIO_CHANNEL_WEBSOCK_MAX_BUFFER 8192
+
+ #define QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN 24
+@@ -1208,7 +1208,7 @@ qio_channel_websock_source_check(GSource *source)
+ if (wsource->wioc->rawinput.offset || wsource->wioc->io_eof) {
+ cond |= G_IO_IN;
+ }
+- if (wsource->wioc->rawoutput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER) {
++ if (wsource->wioc->encoutput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER) {
+ cond |= G_IO_OUT;
+ }
+
+--
+2.15.0
+