This is a note to let you know that I've just added the patch titled
random: remove kernel.random.read_wakeup_threshold
to the 4.14-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-remove-kernel.random.read_wakeup_threshold.patch
and it can be found in the queue-4.14 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 Thu Jun 16 07:08:33 PM CEST 2022
From: Andy Lutomirski <luto@xxxxxxxxxx>
Date: Mon, 23 Dec 2019 00:20:51 -0800
Subject: random: remove kernel.random.read_wakeup_threshold
From: Andy Lutomirski <luto@xxxxxxxxxx>
commit c95ea0c69ffda19381c116db2be23c7e654dac98 upstream.
It has no effect any more, so remove it. We can revert this if
there is some user code that expects to be able to set this sysctl.
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
Link: https://lore.kernel.org/r/a74ed2cf0b5a5451428a246a9239f5bc4e29358f.1577088521.git.luto@xxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/char/random.c | 18 +-----------------
1 file changed, 1 insertion(+), 17 deletions(-)
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -370,12 +370,6 @@
#define ENTROPY_BITS(r) ((r)->entropy_count >> ENTROPY_SHIFT)
/*
- * The minimum number of bits of entropy before we wake up a read on
- * /dev/random. Should be enough to do a significant reseed.
- */
-static int random_read_wakeup_bits = 64;
-
-/*
* If the entropy count falls under this number of bits, then we
* should wake up processes which are selecting or polling on write
* access to /dev/random.
@@ -2010,8 +2004,7 @@ SYSCALL_DEFINE3(getrandom, char __user *
#include <linux/sysctl.h>
-static int min_read_thresh = 8, min_write_thresh;
-static int max_read_thresh = OUTPUT_POOL_WORDS * 32;
+static int min_write_thresh;
static int max_write_thresh = INPUT_POOL_WORDS * 32;
static int random_min_urandom_seed = 60;
static char sysctl_bootid[16];
@@ -2087,15 +2080,6 @@ struct ctl_table random_table[] = {
.data = &input_pool.entropy_count,
},
{
- .procname = "read_wakeup_threshold",
- .data = &random_read_wakeup_bits,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = &min_read_thresh,
- .extra2 = &max_read_thresh,
- },
- {
.procname = "write_wakeup_threshold",
.data = &random_write_wakeup_bits,
.maxlen = sizeof(int),
Patches currently in stable-queue which might be from luto@xxxxxxxxxx are
queue-4.14/random-remove-kernel.random.read_wakeup_threshold.patch
queue-4.14/random-initialize-chacha20-constants-with-correct-endianness.patch
queue-4.14/random-make-dev-random-be-almost-like-dev-urandom.patch
queue-4.14/random-remove-batched-entropy-locking.patch
queue-4.14/random-remove-the-blocking-pool.patch
queue-4.14/random-ignore-grnd_random-in-getentropy-2.patch
queue-4.14/random-delete-code-to-pull-data-into-pools.patch
queue-4.14/random-don-t-wake-crng_init_wait-when-crng_init-1.patch
queue-4.14/random-add-a-urandom_read_nowait-for-random-apis-that-don-t-warn.patch
queue-4.14/random-remove-dead-code-left-over-from-blocking-pool.patch
queue-4.14/random-try-to-actively-add-entropy-rather-than-passively-wait-for-it.patch
queue-4.14/random-add-grnd_insecure-to-return-best-effort-non-cryptographic-bytes.patch
