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AP/AP_VLAN modes don't accept any real 802.11 multicast data frames, but since they do need to accept broadcast management frames the same is currently permitted for data frames. This opens a security problem because such frames would be decrypted with the GTK, and could even contain unicast L3 frames. Since the spec says that ToDS frames must always have the BSSID as the RA (addr1), reject any other data frames. The problem was originally reported in "Predicting, Decrypting, and Abusing WPA2/802.11 Group Keys" at usenix https://www.usenix.org/conference/usenixsecurity16/technical-sessions/presentation/vanhoef and brought to my attention by Jouni. Cc: stable@vger.kernel.org Reported-by: Jouni Malinen <j@w1.fi> Signed-off-by: Johannes Berg <johannes.berg@intel.com> -- Dave, I didn't want to send you a new pull request for a single commit yet again - can you apply this one patch as is? Signed-off-by: David S. Miller <davem@davemloft.net> |
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| README | ||
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.