linux-kernel - [PATCH] random: fix the RNDRESEEDCRNG ioctl

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Message-Id: <20200916041908.66649-1-ebiggers@kernel.org>
Date:   Tue, 15 Sep 2020 21:19:08 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Theodore Ts'o <tytso@....edu>
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>, Jann Horn <jannh@...gle.com>
Subject: [PATCH] random: fix the RNDRESEEDCRNG ioctl

From: Eric Biggers <ebiggers@...gle.com>

The RNDRESEEDCRNG ioctl reseeds the primary_crng from itself, which
doesn't make sense.  Reseed it from the input_pool instead.

Fixes: d848e5f8e1eb ("random: add new ioctl RNDRESEEDCRNG")
Cc: stable@...r.kernel.org
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 drivers/char/random.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/random.c b/drivers/char/random.c
index d20ba1b104ca3..a8b9e66f41435 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1973,7 +1973,7 @@ static long random_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
 			return -EPERM;
 		if (crng_init < 2)
 			return -ENODATA;
-		crng_reseed(&primary_crng, NULL);
+		crng_reseed(&primary_crng, &input_pool);
 		crng_global_init_time = jiffies - 1;
 		return 0;
 	default:
-- 
2.28.0