On Mon, May 30, 2016 at 4:30 PM, Emese Revfy <re.em...@gmail.com> wrote: > I would like to introduce the latent_entropy gcc plugin. This plugin mitigates > the problem of the kernel having too little entropy during and after boot > for generating crypto keys. > > This plugin mixes random values into the latent_entropy global variable > in functions marked by the __latent_entropy attribute. > The value of this global variable is added to the kernel entropy pool > to increase the entropy. > > It is a CII project supported by the Linux Foundation. > > The latent_entropy plugin was ported from grsecurity/PaX originally written by > the PaX Team. You can find more about the plugin here: > https://grsecurity.net/pipermail/grsecurity/2012-July/001093.html > > The plugin supports all gcc version from 4.5 to 6.0. > > I do some changes above the PaX version. The important one is mixing > the stack pointer into the global variable too. > You can find more about the changes here: > https://github.com/ephox-gcc-plugins/latent_entropy > > This patch set is based on the "Introduce GCC plugin infrastructure" patch > set (v9 next-20160520). > > Emese Revfy (3): > Add the latent_entropy gcc plugin > Mark functions with the latent_entropy attribute > Add the extra_latent_entropy kernel parameter > > > Changes from v1: > * Remove unnecessary ifdefs > (Suggested-by: Kees Cook <keesc...@chromium.org>) > * Separate the two definitions of add_latent_entropy() > (Suggested-by: Kees Cook <keesc...@chromium.org>) > * Removed unnecessary global variable (latent_entropy_plugin.c) > * About the latent_entropy gcc attribute (latent_entropy_plugin.c) > * Measure the boot time performance impact of the latent_entropy plugin > (arch/Kconfig)
By the way, as you work on v3, can you also be sure to put your patches through scripts/checkpatch.pl? There are a lot of >80 character lines, and other nits. I'd like to minimize the warnings. Thanks! -Kees -- Kees Cook Chrome OS & Brillo Security
