linux-kernel - [PATCH] Input: evdev - get rid of old workaround for EVIOCGBIT

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Message-ID: <20140424052719.GA29764@core.coreip.homeip.net>
Date:	Wed, 23 Apr 2014 22:27:20 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	linux-input@...r.kernel.org
Cc:	David Herrmann <dh.herrmann@...il.com>,
	Peter Hutterer <peter.hutterer@...-t.net>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] Input: evdev - get rid of old workaround for EVIOCGBIT

We put this workaround in 2008 and the offending userspace has been fixed
up long time ago; the link in the message is no longer valid either, so it
is time to retire it.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/input/evdev.c | 18 ------------------
 1 file changed, 18 deletions(-)

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index ce953d8..fd325ec 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -629,12 +629,10 @@ static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
 	return copy_to_user(p, str, len) ? -EFAULT : len;
 }
 
-#define OLD_KEY_MAX	0x1ff
 static int handle_eviocgbit(struct input_dev *dev,
 			    unsigned int type, unsigned int size,
 			    void __user *p, int compat_mode)
 {
-	static unsigned long keymax_warn_time;
 	unsigned long *bits;
 	int len;
 
@@ -652,24 +650,8 @@ static int handle_eviocgbit(struct input_dev *dev,
 	default: return -EINVAL;
 	}
 
-	/*
-	 * Work around bugs in userspace programs that like to do
-	 * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len'
-	 * should be in bytes, not in bits.
-	 */
-	if (type == EV_KEY && size == OLD_KEY_MAX) {
-		len = OLD_KEY_MAX;
-		if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000))
-			pr_warning("(EVIOCGBIT): Suspicious buffer size %u, "
-				   "limiting output to %zu bytes. See "
-				   "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n",
-				   OLD_KEY_MAX,
-				   BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long));
-	}
-
 	return bits_to_user(bits, len, size, p, compat_mode);
 }
-#undef OLD_KEY_MAX
 
 static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p)
 {
-- 
1.9.0


-- 
Dmitry
--
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