linux-kernel - Re: [PATCH v7 07/11] firmware: qcom: tzmem: export shm

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Message-ID: <f10f1602-972a-491f-9c11-95e5e7bd80f8@oss.qualcomm.com>
Date: Wed, 13 Aug 2025 12:06:58 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Amirreza Zarrabi <amirreza.zarrabi@....qualcomm.com>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Sumit Garg <sumit.garg@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Apurupa Pattapu <quic_apurupa@...cinc.com>,
        Kees Cook <kees@...nel.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>
Cc: Harshal Dev <quic_hdev@...cinc.com>, linux-arm-msm@...r.kernel.org,
        op-tee@...ts.trustedfirmware.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, linux-doc@...r.kernel.org,
        Neil Armstrong <neil.armstrong@...aro.org>
Subject: Re: [PATCH v7 07/11] firmware: qcom: tzmem: export shm_bridge
 create/delete

On 8/13/25 2:35 AM, Amirreza Zarrabi wrote:
> Anyone with access to contiguous physical memory should be able to
> share memory with QTEE using shm_bridge.
> 
> Tested-by: Neil Armstrong <neil.armstrong@...aro.org>
> Tested-by: Harshal Dev <quic_hdev@...cinc.com>
> Signed-off-by: Amirreza Zarrabi <amirreza.zarrabi@....qualcomm.com>
> ---

Hm, I thought the idea for the tzmem allocator was to abstract
these operations to prevent users from shooting themselves in
the foot, and this seems to be circumventing that..

Konrad