linux-kernel - [PATCH 5.11 018/775] random: fix the RNDRESEEDCRNG ioctl

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Date:   Mon,  1 Mar 2021 17:03:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, linux-crypto@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>,
        Jann Horn <jannh@...gle.com>, Theodore Tso <tytso@....edu>,
        Ard Biesheuvel <ardb@...nel.org>,
        Eric Biggers <ebiggers@...gle.com>
Subject: [PATCH 5.11 018/775] random: fix the RNDRESEEDCRNG ioctl

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

commit 11a0b5e0ec8c13bef06f7414f9e914506140d5cb upstream.

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
Cc: linux-crypto@...r.kernel.org
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Jann Horn <jannh@...gle.com>
Cc: Theodore Ts'o <tytso@....edu>
Reviewed-by: Jann Horn <jannh@...gle.com>
Acked-by: Ard Biesheuvel <ardb@...nel.org>
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
Link: https://lore.kernel.org/r/20210112192818.69921-1-ebiggers@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/char/random.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1972,7 +1972,7 @@ static long random_ioctl(struct file *f,
 			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: