linux-kernel - [PATCH 2/2] vt: make mouse selection of non-ASCII consistent

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Message-Id: <20170327103704.22171-2-kilobyte@angband.pl>
Date:   Mon, 27 Mar 2017 12:37:04 +0200
From:   Adam Borowski <kilobyte@...band.pl>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, linux-kernel@...r.kernel.org
Cc:     Adam Borowski <kilobyte@...band.pl>
Subject: [PATCH 2/2] vt: make mouse selection of non-ASCII consistent

For some reason a handful of ISO-8859-1 symbols are excluded from "word
chars" while the vast majority of Unicode is hard-coded as included, even
when inappropriate (we really would want to _not_ select line-drawing/etc).
Those symbols are: ¡¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶·¸¹º»¼½¾¿×÷

Thus, let's not special-case any non-ASCII anymore.  Attempts to set these
via ioctl will be silently ignored.

As an extra bonus, we debloat the kernel by 128 bytes.

Signed-off-by: Adam Borowski <kilobyte@...band.pl>
---
 drivers/tty/vt/selection.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c
index 2252e11d8347..c81c99165ea6 100644
--- a/drivers/tty/vt/selection.c
+++ b/drivers/tty/vt/selection.c
@@ -80,21 +80,17 @@ void clear_selection(void)
 
 /*
  * User settable table: what characters are to be considered alphabetic?
- * 256 bits. Locked by the console lock.
+ * 128 bits. Locked by the console lock.
  */
-static u32 inwordLut[8]={
+static u32 inwordLut[4]={
   0x00000000, /* control chars     */
   0x03FFE000, /* digits and "-./"  */
   0x87FFFFFE, /* uppercase and '_' */
   0x07FFFFFE, /* lowercase         */
-  0x00000000,
-  0x00000000,
-  0xFF7FFFFF, /* latin-1 accented letters, not multiplication sign */
-  0xFF7FFFFF  /* latin-1 accented letters, not division sign */
 };
 
 static inline int inword(const u16 c) {
-	return c > 0xff || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
+	return c > 0x7f || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
 }
 
 /**
@@ -106,10 +102,10 @@ static inline int inword(const u16 c) {
  */
 int sel_loadlut(char __user *p)
 {
-	u32 tmplut[8];
-	if (copy_from_user(tmplut, (u32 __user *)(p+4), 32))
+	u32 tmplut[4];
+	if (copy_from_user(tmplut, (u32 __user *)(p+4), 16))
 		return -EFAULT;
-	memcpy(inwordLut, tmplut, 32);
+	memcpy(inwordLut, tmplut, 16);
 	return 0;
 }
 
-- 
2.11.0