qemu: Add fix for CVE-2022-1050

Add a fix queued upstream for the issue in this CVE:

"""
Guest driver might execute HW commands when shared buffers are not yet
allocated.
This might happen on purpose (malicious guest) or because some other
guest/host address mapping.
We need to protect againts such case.
"""

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/meta/recipes-devtools/qemu/qemu/pvrdma.patch b/meta/recipes-devtools/qemu/qemu/pvrdma.patch
new file mode 100644
index 0000000000..7b0335b1dc
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/pvrdma.patch
@@ -0,0 +1,45 @@
+hw/pvrdma: Protect against buggy or malicious guest driver
+
+Guest driver might execute HW commands when shared buffers are not yet
+allocated.
+This might happen on purpose (malicious guest) or because some other
+guest/host address mapping.
+We need to protect againts such case.
+
+Reported-by: Mauro Matteo Cascella <mcascell@redhat.com>
+Signed-off-by: Yuval Shaia <yuval.shaia.ml@gmail.com>
+
+CVE: CVE-2022-1050
+Upstream-Status: Submitted [https://lists.nongnu.org/archive/html/qemu-devel/2022-03/msg05197.html]
+
+Index: qemu-6.2.0/hw/rdma/vmw/pvrdma_cmd.c
+===================================================================
+--- qemu-6.2.0.orig/hw/rdma/vmw/pvrdma_cmd.c
++++ qemu-6.2.0/hw/rdma/vmw/pvrdma_cmd.c
+@@ -796,6 +796,12 @@ int pvrdma_exec_cmd(PVRDMADev *dev)
+ 
+     dsr_info = &dev->dsr_info;
+ 
++    if (!dsr_info->dsr) {
++            /* Buggy or malicious guest driver */
++            rdma_error_report("Exec command without dsr, req or rsp buffers");
++            goto out;
++    }
++
+     if (dsr_info->req->hdr.cmd >= sizeof(cmd_handlers) /
+                       sizeof(struct cmd_handler)) {
+         rdma_error_report("Unsupported command");
+Index: qemu-6.2.0/hw/rdma/vmw/pvrdma_main.c
+===================================================================
+--- qemu-6.2.0.orig/hw/rdma/vmw/pvrdma_main.c
++++ qemu-6.2.0/hw/rdma/vmw/pvrdma_main.c
+@@ -249,7 +249,8 @@ static void init_dsr_dev_caps(PVRDMADev
+ {
+     struct pvrdma_device_shared_region *dsr;
+ 
+-    if (dev->dsr_info.dsr == NULL) {
++    if (!dev->dsr_info.dsr) {
++        /* Buggy or malicious guest driver */
+         rdma_error_report("Can't initialized DSR");
+         return;
+     }