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Since the RNG loses freshness with system suspend/hibernation, when we resume, immediately reseed using whatever data we can, which for this particular case is the various timestamps regarding system suspend time, in addition to more generally the RDSEED/RDRAND/RDTSC values that happen whenever the crng reseeds. On systems that suspend and resume automatically all the time -- such as Android -- we skip the reseeding on suspend resumption, since that could wind up being far too busy. This is the same trade-off made in WireGuard. In addition to reseeding upon resumption always mix into the pool these various stamps on every power notification event. Cc: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.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.
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.