This is a note to let you know that I've just added the patch titled
random: document add_hwgenerator_randomness() with other input functions
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
random-document-add_hwgenerator_randomness-with-other-input-functions.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Fri Jun 17 08:58:56 AM CEST 2022
From: Mark Brown <broonie@xxxxxxxxxx>
Date: Wed, 1 Dec 2021 17:44:49 +0000
Subject: random: document add_hwgenerator_randomness() with other input functions
From: Mark Brown <broonie@xxxxxxxxxx>
commit 2b6c6e3d9ce3aa0e547ac25d60e06fe035cd9f79 upstream.
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@xxxxxxxxxx>
[Jason: reorganize position of function in doc comment and also document
add_bootloader_randomness() while we're at it.]
Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/char/random.c | 11 +++++++++++
1 file changed, 11 insertions(+)
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -202,6 +202,9 @@
* unsigned int value);
* void add_interrupt_randomness(int irq, int irq_flags);
* void add_disk_randomness(struct gendisk *disk);
+ * void add_hwgenerator_randomness(const char *buffer, size_t count,
+ * size_t entropy);
+ * void add_bootloader_randomness(const void *buf, unsigned int size);
*
* add_device_randomness() is for adding data to the random pool that
* is likely to differ between two devices (or possibly even per boot).
@@ -228,6 +231,14 @@
* particular randomness source. They do this by keeping track of the
* first and second order deltas of the event timings.
*
+ * add_hwgenerator_randomness() is for true hardware RNGs, and will credit
+ * entropy as specified by the caller. If the entropy pool is full it will
+ * block until more entropy is needed.
+ *
+ * add_bootloader_randomness() is the same as add_hwgenerator_randomness() or
+ * add_device_randomness(), depending on whether or not the configuration
+ * option CONFIG_RANDOM_TRUST_BOOTLOADER is set.
+ *
* Ensuring unpredictability at system startup
* ============================================
*
Patches currently in stable-queue which might be from broonie@xxxxxxxxxx are
queue-4.19/random-split-primary-secondary-crng-init-paths.patch
queue-4.19/linux-random.h-remove-arch_has_random-arch_has_random_seed.patch
queue-4.19/powerpc-remove-arch_has_random-arch_has_random_seed.patch
queue-4.19/random-add-arch_get_random_-long_early.patch
queue-4.19/random-document-add_hwgenerator_randomness-with-other-input-functions.patch
queue-4.19/powerpc-use-bool-in-archrandom.h.patch
queue-4.19/s390-remove-arch_has_random-arch_has_random_seed.patch
queue-4.19/linux-random.h-mark-config_arch_random-functions-__must_check.patch
queue-4.19/linux-random.h-use-false-with-bool.patch
queue-4.19/x86-remove-arch_has_random-arch_has_random_seed.patch
