linux-kernel - [PATCH] char: random: fix urandom ioctl support

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Message-Id: <20191207185837.4030699-1-arnd@arndb.de>
Date:   Sat,  7 Dec 2019 19:58:20 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     "Theodore Ts'o" <tytso@....edu>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     youling 257 <youling257@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] char: random: fix urandom ioctl support

My patch to move the /dev/random compat handling from
fs/compat_ioctl.c int drivers missed the corresponding
/dev/urandom support.

Use the same compat_ptr_ioctl() in both devices.

Fixes: 507e4e2b430b ("compat_ioctl: remove /dev/random commands")
Reported-by: youling 257 <youling257@...il.com>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/char/random.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 46afd14facb7..9280ca4d85c0 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -2176,6 +2176,7 @@ const struct file_operations urandom_fops = {
 	.read  = urandom_read,
 	.write = random_write,
 	.unlocked_ioctl = random_ioctl,
+	.compat_ioctl = compat_ptr_ioctl,
 	.fasync = random_fasync,
 	.llseek = noop_llseek,
 };
-- 
2.20.0