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From: Jens Wiklander <jens.wiklander@linaro.org>
To: Tyler Hicks <tyhicks@linux.microsoft.com>
Cc: "Allen Pais" <apais@linux.microsoft.com>,
	"Sumit Garg" <sumit.garg@linaro.org>,
	"Peter Huewe" <peterhuewe@gmx.de>,
	"Jarkko Sakkinen" <jarkko@kernel.org>,
	"Jason Gunthorpe" <jgg@ziepe.ca>,
	"Vikas Gupta" <vikas.gupta@broadcom.com>,
	"Thirupathaiah Annapureddy" <thiruan@microsoft.com>,
	"Pavel Tatashin" <pasha.tatashin@soleen.com>,
	"Rafał Miłecki" <zajec5@gmail.com>,
	"OP-TEE TrustedFirmware" <op-tee@lists.trustedfirmware.org>,
	linux-integrity <linux-integrity@vger.kernel.org>,
	bcm-kernel-feedback-list@broadcom.com,
	linux-mips@vger.kernel.org,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v5 4/8] optee: Clear stale cache entries during initialization
Date: Tue, 15 Jun 2021 09:00:36 +0200	[thread overview]
Message-ID: <CAHUa44HeJu9_33H3V=ms5=Z4tKSgQ8=3nWqUDvvNgJvaUB4H=A@mail.gmail.com> (raw)
In-Reply-To: <20210614223317.999867-5-tyhicks@linux.microsoft.com>

On Tue, Jun 15, 2021 at 12:33 AM Tyler Hicks
<tyhicks@linux.microsoft.com> wrote:
>
> The shm cache could contain invalid addresses if
> optee_disable_shm_cache() was not called from the .shutdown hook of the
> previous kernel before a kexec. These addresses could be unmapped or
> they could point to mapped but unintended locations in memory.
>
> Clear the shared memory cache, while being careful to not translate the
> addresses returned from OPTEE_SMC_DISABLE_SHM_CACHE, during driver
> initialization. Once all pre-cache shm objects are removed, proceed with
> enabling the cache so that we know that we can handle cached shm objects
> with confidence later in the .shutdown hook.
>
> Cc: stable@vger.kernel.org
> Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
> ---
>  drivers/tee/optee/call.c          | 36 ++++++++++++++++++++++++++++---
>  drivers/tee/optee/core.c          |  9 ++++++++
>  drivers/tee/optee/optee_private.h |  1 +
>  3 files changed, 43 insertions(+), 3 deletions(-)

Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

  reply	other threads:[~2021-06-15  7:00 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-14 22:33 [PATCH v5 0/8] tee: Improve support for kexec and kdump Tyler Hicks
2021-06-14 22:33 ` [PATCH v5 1/8] optee: Fix memory leak when failing to register shm pages Tyler Hicks
2021-06-14 22:33 ` [PATCH v5 2/8] optee: Refuse to load the driver under the kdump kernel Tyler Hicks
2021-06-14 22:33 ` [PATCH v5 3/8] optee: fix tee out of memory failure seen during kexec reboot Tyler Hicks
2021-06-14 22:33 ` [PATCH v5 4/8] optee: Clear stale cache entries during initialization Tyler Hicks
2021-06-15  7:00   ` Jens Wiklander [this message]
2021-06-14 22:33 ` [PATCH v5 5/8] tee: add tee_shm_alloc_kernel_buf() Tyler Hicks
2021-06-14 22:33 ` [PATCH v5 6/8] tee: Correct inappropriate usage of TEE_SHM_DMA_BUF flag Tyler Hicks
2021-06-15  7:10   ` Jens Wiklander
2021-06-14 22:33 ` [PATCH v5 7/8] tpm_ftpm_tee: Free and unregister TEE shared memory during kexec Tyler Hicks
2021-06-14 22:33 ` [PATCH v5 8/8] firmware: tee_bnxt: Release TEE shm, session, and context " Tyler Hicks
2021-06-15  4:32 ` [PATCH v5 0/8] tee: Improve support for kexec and kdump Sumit Garg
2021-06-15  4:34   ` Tyler Hicks
2021-06-15  7:23 ` Jens Wiklander
2021-06-15 13:37   ` Tyler Hicks
2021-06-15 14:15     ` Florian Fainelli
2021-07-21  6:03       ` Jens Wiklander

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