This is a note to let you know that I've just added the patch titled
random: use arch_get_random*_early() in random_init()
to the 6.0-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-use-arch_get_random-_early-in-random_init.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f5e4ec155d145002fd9840868453d785fab86d42 Mon Sep 17 00:00:00 2001
From: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
Date: Fri, 28 Oct 2022 17:00:42 +0100
Subject: random: use arch_get_random*_early() in random_init()
From: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
commit f5e4ec155d145002fd9840868453d785fab86d42 upstream.
While reworking the archrandom handling, commit d349ab99eec7 ("random:
handle archrandom with multiple longs") switched to the non-early
archrandom helpers in random_init(), which broke initialization of the
entropy pool from the arm64 random generator.
Indeed at that point the arm64 CPU features, which verify that all CPUs
have compatible capabilities, are not finalized so arch_get_random_seed_longs()
is unsuccessful. Instead random_init() should use the _early functions,
which check only the boot CPU on arm64. On other architectures the
_early functions directly call the normal ones.
Fixes: d349ab99eec7 ("random: handle archrandom with multiple longs")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/char/random.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -793,13 +793,13 @@ int __init random_init(const char *comma
#endif
for (i = 0, arch_bits = sizeof(entropy) * 8; i < ARRAY_SIZE(entropy);) {
- longs = arch_get_random_seed_longs(entropy, ARRAY_SIZE(entropy) - i);
+ longs = arch_get_random_seed_longs_early(entropy, ARRAY_SIZE(entropy) - i);
if (longs) {
_mix_pool_bytes(entropy, sizeof(*entropy) * longs);
i += longs;
continue;
}
- longs = arch_get_random_longs(entropy, ARRAY_SIZE(entropy) - i);
+ longs = arch_get_random_longs_early(entropy, ARRAY_SIZE(entropy) - i);
if (longs) {
_mix_pool_bytes(entropy, sizeof(*entropy) * longs);
i += longs;
Patches currently in stable-queue which might be from jean-philippe@xxxxxxxxxx are
queue-6.0/random-use-arch_get_random-_early-in-random_init.patch
