diff options
Diffstat (limited to 'app-emulation/qemu/files/qemu-2.9.0-CVE-2017-9524-2.patch')
| -rw-r--r-- | app-emulation/qemu/files/qemu-2.9.0-CVE-2017-9524-2.patch | 197 |
1 files changed, 0 insertions, 197 deletions
diff --git a/app-emulation/qemu/files/qemu-2.9.0-CVE-2017-9524-2.patch b/app-emulation/qemu/files/qemu-2.9.0-CVE-2017-9524-2.patch deleted file mode 100644 index e6934b379a26..000000000000 --- a/app-emulation/qemu/files/qemu-2.9.0-CVE-2017-9524-2.patch +++ /dev/null @@ -1,197 +0,0 @@ -From 0c9390d978cbf61e8f16c9f580fa96b305c43568 Mon Sep 17 00:00:00 2001 -From: Eric Blake <eblake@redhat.com> -Date: Thu, 8 Jun 2017 17:26:17 -0500 -Subject: [PATCH] nbd: Fix regression on resiliency to port scan - -Back in qemu 2.5, qemu-nbd was immune to port probes (a transient -server would not quit, regardless of how many probe connections -came and went, until a connection actually negotiated). But we -broke that in commit ee7d7aa when removing the return value to -nbd_client_new(), although that patch also introduced a bug causing -an assertion failure on a client that fails negotiation. We then -made it worse during refactoring in commit 1a6245a (a segfault -before we could even assert); the (masked) assertion was cleaned -up in d3780c2 (still in 2.6), and just recently we finally fixed -the segfault ("nbd: Fully intialize client in case of failed -negotiation"). But that still means that ever since we added -TLS support to qemu-nbd, we have been vulnerable to an ill-timed -port-scan being able to cause a denial of service by taking down -qemu-nbd before a real client has a chance to connect. - -Since negotiation is now handled asynchronously via coroutines, -we no longer have a synchronous point of return by re-adding a -return value to nbd_client_new(). So this patch instead wires -things up to pass the negotiation status through the close_fn -callback function. - -Simple test across two terminals: -$ qemu-nbd -f raw -p 30001 file -$ nmap 127.0.0.1 -p 30001 && \ - qemu-io -c 'r 0 512' -f raw nbd://localhost:30001 - -Note that this patch does not change what constitutes successful -negotiation (thus, a client must enter transmission phase before -that client can be considered as a reason to terminate the server -when the connection ends). Perhaps we may want to tweak things -in a later patch to also treat a client that uses NBD_OPT_ABORT -as being a 'successful' negotiation (the client correctly talked -the NBD protocol, and informed us it was not going to use our -export after all), but that's a discussion for another day. - -Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1451614 - -Signed-off-by: Eric Blake <eblake@redhat.com> -Message-Id: <20170608222617.20376-1-eblake@redhat.com> -Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> ---- - blockdev-nbd.c | 6 +++++- - include/block/nbd.h | 2 +- - nbd/server.c | 24 +++++++++++++++--------- - qemu-nbd.c | 4 ++-- - 4 files changed, 23 insertions(+), 13 deletions(-) - -diff --git a/blockdev-nbd.c b/blockdev-nbd.c -index dd0860f4a6..28f551a7b0 100644 ---- a/blockdev-nbd.c -+++ b/blockdev-nbd.c -@@ -27,6 +27,10 @@ typedef struct NBDServerData { - - static NBDServerData *nbd_server; - -+static void nbd_blockdev_client_closed(NBDClient *client, bool ignored) -+{ -+ nbd_client_put(client); -+} - - static gboolean nbd_accept(QIOChannel *ioc, GIOCondition condition, - gpointer opaque) -@@ -46,7 +50,7 @@ static gboolean nbd_accept(QIOChannel *ioc, GIOCondition condition, - qio_channel_set_name(QIO_CHANNEL(cioc), "nbd-server"); - nbd_client_new(NULL, cioc, - nbd_server->tlscreds, NULL, -- nbd_client_put); -+ nbd_blockdev_client_closed); - object_unref(OBJECT(cioc)); - return TRUE; - } -diff --git a/include/block/nbd.h b/include/block/nbd.h -index 416257abca..8fa5ce51f3 100644 ---- a/include/block/nbd.h -+++ b/include/block/nbd.h -@@ -162,7 +162,7 @@ void nbd_client_new(NBDExport *exp, - QIOChannelSocket *sioc, - QCryptoTLSCreds *tlscreds, - const char *tlsaclname, -- void (*close)(NBDClient *)); -+ void (*close_fn)(NBDClient *, bool)); - void nbd_client_get(NBDClient *client); - void nbd_client_put(NBDClient *client); - -diff --git a/nbd/server.c b/nbd/server.c -index 49b55f6ede..f2b1aa47ce 100644 ---- a/nbd/server.c -+++ b/nbd/server.c -@@ -81,7 +81,7 @@ static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports); - - struct NBDClient { - int refcount; -- void (*close)(NBDClient *client); -+ void (*close_fn)(NBDClient *client, bool negotiated); - - bool no_zeroes; - NBDExport *exp; -@@ -778,7 +778,7 @@ void nbd_client_put(NBDClient *client) - } - } - --static void client_close(NBDClient *client) -+static void client_close(NBDClient *client, bool negotiated) - { - if (client->closing) { - return; -@@ -793,8 +793,8 @@ static void client_close(NBDClient *client) - NULL); - - /* Also tell the client, so that they release their reference. */ -- if (client->close) { -- client->close(client); -+ if (client->close_fn) { -+ client->close_fn(client, negotiated); - } - } - -@@ -975,7 +975,7 @@ void nbd_export_close(NBDExport *exp) - - nbd_export_get(exp); - QTAILQ_FOREACH_SAFE(client, &exp->clients, next, next) { -- client_close(client); -+ client_close(client, true); - } - nbd_export_set_name(exp, NULL); - nbd_export_set_description(exp, NULL); -@@ -1337,7 +1337,7 @@ done: - - out: - nbd_request_put(req); -- client_close(client); -+ client_close(client, true); - nbd_client_put(client); - } - -@@ -1363,7 +1363,7 @@ static coroutine_fn void nbd_co_client_start(void *opaque) - qemu_co_mutex_init(&client->send_lock); - - if (nbd_negotiate(data)) { -- client_close(client); -+ client_close(client, false); - goto out; - } - -@@ -1373,11 +1373,17 @@ out: - g_free(data); - } - -+/* -+ * Create a new client listener on the given export @exp, using the -+ * given channel @sioc. Begin servicing it in a coroutine. When the -+ * connection closes, call @close_fn with an indication of whether the -+ * client completed negotiation. -+ */ - void nbd_client_new(NBDExport *exp, - QIOChannelSocket *sioc, - QCryptoTLSCreds *tlscreds, - const char *tlsaclname, -- void (*close_fn)(NBDClient *)) -+ void (*close_fn)(NBDClient *, bool)) - { - NBDClient *client; - NBDClientNewData *data = g_new(NBDClientNewData, 1); -@@ -1394,7 +1400,7 @@ void nbd_client_new(NBDExport *exp, - object_ref(OBJECT(client->sioc)); - client->ioc = QIO_CHANNEL(sioc); - object_ref(OBJECT(client->ioc)); -- client->close = close_fn; -+ client->close_fn = close_fn; - - data->client = client; - data->co = qemu_coroutine_create(nbd_co_client_start, data); -diff --git a/qemu-nbd.c b/qemu-nbd.c -index 651f85ecc1..9464a0461c 100644 ---- a/qemu-nbd.c -+++ b/qemu-nbd.c -@@ -336,10 +336,10 @@ static void nbd_export_closed(NBDExport *exp) - - static void nbd_update_server_watch(void); - --static void nbd_client_closed(NBDClient *client) -+static void nbd_client_closed(NBDClient *client, bool negotiated) - { - nb_fds--; -- if (nb_fds == 0 && !persistent && state == RUNNING) { -+ if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) { - state = TERMINATE; - } - nbd_update_server_watch(); --- -2.13.0 - |