qemu: re-add the fix for CVE-2022-1050

This patch was accidentally dropped in the 7.1.0 upgrade, so bring it
back.

(From OE-Core rev: 09bcf6d2a661a3c39fdd13a760f6c26dd79abb69)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/meta/recipes-devtools/qemu/qemu/0010-hw-pvrdma-Protect-against-buggy-or-malicious-guest-d.patch b/meta/recipes-devtools/qemu/qemu/0010-hw-pvrdma-Protect-against-buggy-or-malicious-guest-d.patch
new file mode 100644
index 0000000000..810c74fabd
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/0010-hw-pvrdma-Protect-against-buggy-or-malicious-guest-d.patch
@@ -0,0 +1,43 @@
+CVE: CVE-2022-1050
+Upstream-Status: Submitted [https://lore.kernel.org/qemu-devel/20220403095234.2210-1-yuval.shaia.ml@gmail.com/]
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+
+From dbdef95c272e8f3ec037c3db4197c66002e30995 Mon Sep 17 00:00:00 2001
+From: Yuval Shaia <yuval.shaia.ml@gmail.com>
+Date: Sun, 3 Apr 2022 12:52:34 +0300
+Subject: [PATCH] hw/pvrdma: Protect against buggy or malicious guest driver
+
+Guest driver might execute HW commands when shared buffers are not yet
+allocated.
+This could happen on purpose (malicious guest) or because of some other
+guest/host address mapping error.
+We need to protect againts such case.
+
+Fixes: CVE-2022-1050
+
+Reported-by: Raven <wxhusst@gmail.com>
+Signed-off-by: Yuval Shaia <yuval.shaia.ml@gmail.com>
+---
+ hw/rdma/vmw/pvrdma_cmd.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/hw/rdma/vmw/pvrdma_cmd.c b/hw/rdma/vmw/pvrdma_cmd.c
+index da7ddfa548..89db963c46 100644
+--- a/hw/rdma/vmw/pvrdma_cmd.c
++++ b/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");
+-- 
+2.34.1
+