This is a note to let you know that I've just added the patch titled
random: clamp credited irq bits to maximum mixed
to the 4.9-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-clamp-credited-irq-bits-to-maximum-mixed.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e78a802a7b4febf53f2a92842f494b01062d85a8 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@xxxxxxxxx>
Date: Fri, 23 Sep 2022 02:42:51 +0200
Subject: random: clamp credited irq bits to maximum mixed
From: Jason A. Donenfeld <Jason@xxxxxxxxx>
commit e78a802a7b4febf53f2a92842f494b01062d85a8 upstream.
Since the most that's mixed into the pool is sizeof(long)*2, don't
credit more than that many bytes of entropy.
Fixes: e3e33fc2ea7f ("random: do not use input pool from hard IRQs")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/char/random.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -977,7 +977,7 @@ static void mix_interrupt_randomness(str
local_irq_enable();
mix_pool_bytes(pool, sizeof(pool));
- credit_init_bits(max(1u, (count & U16_MAX) / 64));
+ credit_init_bits(clamp_t(unsigned int, (count & U16_MAX) / 64, 1, sizeof(pool) * 8));
memzero_explicit(pool, sizeof(pool));
}
Patches currently in stable-queue which might be from Jason@xxxxxxxxx are
queue-4.9/random-restore-o_nonblock-support.patch
queue-4.9/random-clamp-credited-irq-bits-to-maximum-mixed.patch
