linux-kernel - [PATCH] random: Document add_hwgenerator_randomness() with other input functions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <20200701171558.10539-1-broonie@kernel.org>
Date:   Wed,  1 Jul 2020 18:15:58 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Theodore Ts'o <tytso@....edu>
Cc:     linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: [PATCH] random: Document add_hwgenerator_randomness() with other input functions

The section at the top of random.c which documents the input functions
available does not document add_hwgenerator_randomness() which might lead
a reader to overlook it. Add a brief note about it.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 drivers/char/random.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 2a41b21623ae..fc822842eb0e 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -228,6 +228,14 @@
  * particular randomness source.  They do this by keeping track of the
  * first and second order deltas of the event timings.
  *
+ * There is also an interface for true hardware RNGs:
+ *
+ *	void add_hwgenerator_randomness(const char *buffer, size_t count,
+ *				size_t entropy);
+ *
+ * This will credit entropy as specified by the caller, if the entropy
+ * pool is full it will block until more entropy is needed.
+ *
  * Ensuring unpredictability at system startup
  * ============================================
  *
-- 
2.20.1