tree fa2c3f781bfc7a16eb04333347166db1e5339d36
parent de11098824a564d34f70999b8a7bde8f44d2919e
author Ekansh Gupta <quic_ekangupt@quicinc.com> 1719575101 +0100
committer Sasha Levin <sashal@kernel.org> 1721043639 -0400

misc: fastrpc: Restrict untrusted app to attach to privileged PD

commit bab2f5e8fd5d2f759db26b78d9db57412888f187 upstream.

Untrusted application with access to only non-secure fastrpc device
node can attach to root_pd or static PDs if it can make the respective
init request. This can cause problems as the untrusted application
can send bad requests to root_pd or static PDs. Add changes to reject
attach to privileged PDs if the request is being made using non-secure
fastrpc device node.

Fixes: 0871561055e6 ("misc: fastrpc: Add support for audiopd")
Cc: stable <stable@kernel.org>
Signed-off-by: Ekansh Gupta <quic_ekangupt@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20240628114501.14310-7-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>