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hw/pvrdma: Protect against buggy or malicious guest driver

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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>
Message-Id: <20220403095234.2210-1-yuval.shaia.ml@gmail.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
(cherry picked from commit 31c4b6fb0293e359f9ef8a61892667e76eea4c99)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Yuval Shaia 2022-04-03 12:52:34 +03:00 committed by Michael Tokarev
parent b209cc4556
commit a2efa1fac4
1 changed files with 6 additions and 0 deletions
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6
hw/rdma/vmw/pvrdma_cmd.c
View file

@ -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");