5d4b707b45
A persistence map is expected to hold refs=2 during its creation. However, the Fuzzy test can create a persistence map by configuring a mismatch between attributes and flags using the KEEP MAP attribute and FD NOMAP flags. This sets the map reference count to 1. The user then calls fastrpc_internal_munmap_fd to free the map since it doesn't check flags, which can cause a use-after-free (UAF) for the file map and shared buffer. Add a check to restrict DMA handle maps with invalid attributes. Change-Id: I2f024ef99cc2a0487010504166e3af3433d5302d Acked-by: Santosh <quic_ssakore@quicinc.com> Signed-off-by: Abhinav Parihar <quic_parihar@quicinc.com>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.