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misc: fastrpc: restrict user apps from sending kernel RPC messages

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Verify that user applications are not using the kernel RPC message
handle to restrict them from directly attaching to guest OS on the
remote subsystem. This is a port of CVE-2019-2308 fix.

Fixes: c68cfb718c ("misc: fastrpc: Add support for context Invoke method")
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Jonathan Marek <jonathan@marek.ca>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20210212192658.3476137-1-dmitry.baryshkov@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Baryshkov 2021-02-12 22:26:58 +03:00 committed by Greg Kroah-Hartman
parent 1201d68f47
commit 20c40794eb
1 changed files with 5 additions and 0 deletions
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5
drivers/misc/fastrpc.c
View file

@ -950,6 +950,11 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel,
if (!fl->cctx->rpdev)
return -EPIPE;
if (handle == FASTRPC_INIT_HANDLE && !kernel) {
dev_warn_ratelimited(fl->sctx->dev, "user app trying to send a kernel RPC message (%d)\n", handle);
return -EPERM;
}
ctx = fastrpc_context_alloc(fl, kernel, sc, args);
if (IS_ERR(ctx))
return PTR_ERR(ctx);