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[ Upstream commitb541260615] memcmp is not consider safe to use with cryptographic secrets: 'Do not use memcmp() to compare security critical data, such as cryptographic secrets, because the required CPU time depends on the number of equal bytes.' While usage of memcmp for ZERO_KEY may not be considered a security critical data, it can lead to more usage of memcmp with pairing keys which could introduce more security problems. Fixes:455c2ff0a5("Bluetooth: Fix BR/EDR out-of-band pairing with only initiator data") Fixes:33155c4aae("Bluetooth: hci_event: Ignore NULL link key") Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.