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commit b5c10dd04b7418793517e3286cde5c04759a86de upstream. 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> Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org> Reviewed-by: Sumit Garg <sumit.garg@linaro.org> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.