lkml.org 
[lkml]   [2019]   [Apr]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/2] vt: selection: allow functions to be called from inside kernel
Date
This patch breaks set_selection() into two functions so that when
called from kernel, copy_from_user() can be avoided. It also exports
set_selection() and paste_selection().

These changes are used the following patch where speakup's selection
functionality calls into the above functions, thereby doing away with
parallel implementation.

Signed-off-by: Okash Khawaja <okash.khawaja@gmail.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Tested-by: Gregory Nowak <greg@gregn.net>
---
drivers/tty/vt/selection.c | 37 ++++++++++++++++++++++++-------------
include/linux/selection.h | 3 +--
2 files changed, 25 insertions(+), 15 deletions(-)

diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c
index 07496c711d7d..a43f9cd9bdd6 100644
--- a/drivers/tty/vt/selection.c
+++ b/drivers/tty/vt/selection.c
@@ -80,6 +80,7 @@ void clear_selection(void)
sel_start = -1;
}
}
+EXPORT_SYMBOL_GPL(clear_selection);

/*
* User settable table: what characters are to be considered alphabetic?
@@ -164,34 +165,42 @@ static int store_utf8(u32 c, char *p)
* a lot under the lock but its hardly a performance path
*/
int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *tty)
+{
+ struct tiocl_selection v;
+
+ if (copy_from_user(&v, sel, sizeof(*sel)))
+ return -EFAULT;
+
+ return do_set_selection(&v, tty);
+}
+
+int do_set_selection(struct tiocl_selection *v, struct tty_struct *tty)
{
struct vc_data *vc = vc_cons[fg_console].d;
int new_sel_start, new_sel_end, spc;
- struct tiocl_selection v;
char *bp, *obp;
int i, ps, pe, multiplier;
u32 c;
int mode;

poke_blanked_console();
- if (copy_from_user(&v, sel, sizeof(*sel)))
- return -EFAULT;

- v.xs = min_t(u16, v.xs - 1, vc->vc_cols - 1);
- v.ys = min_t(u16, v.ys - 1, vc->vc_rows - 1);
- v.xe = min_t(u16, v.xe - 1, vc->vc_cols - 1);
- v.ye = min_t(u16, v.ye - 1, vc->vc_rows - 1);
- ps = v.ys * vc->vc_size_row + (v.xs << 1);
- pe = v.ye * vc->vc_size_row + (v.xe << 1);
+ v->xs = min_t(u16, v->xs - 1, vc->vc_cols - 1);
+ v->ys = min_t(u16, v->ys - 1, vc->vc_rows - 1);
+ v->xe = min_t(u16, v->xe - 1, vc->vc_cols - 1);
+ v->ye = min_t(u16, v->ye - 1, vc->vc_rows - 1);
+ ps = v->ys * vc->vc_size_row + (v->xs << 1);
+ pe = v->ye * vc->vc_size_row + (v->xe << 1);

- if (v.sel_mode == TIOCL_SELCLEAR) {
+ if (v->sel_mode == TIOCL_SELCLEAR) {
/* useful for screendump without selection highlights */
clear_selection();
return 0;
}

- if (mouse_reporting() && (v.sel_mode & TIOCL_SELMOUSEREPORT)) {
- mouse_report(tty, v.sel_mode & TIOCL_SELBUTTONMASK, v.xs, v.ys);
+ if (mouse_reporting() && (v->sel_mode & TIOCL_SELMOUSEREPORT)) {
+ mouse_report(tty, v->sel_mode & TIOCL_SELBUTTONMASK, v->xs,
+ v->ys);
return 0;
}

@@ -208,7 +217,7 @@ int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *t
else
use_unicode = 0;

- switch (v.sel_mode)
+ switch (v->sel_mode)
{
case TIOCL_SELCHAR: /* character-by-character selection */
new_sel_start = ps;
@@ -322,6 +331,7 @@ int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *t
sel_buffer_lth = bp - sel_buffer;
return 0;
}
+EXPORT_SYMBOL_GPL(do_set_selection);

/* Insert the contents of the selection buffer into the
* queue of the tty associated with the current console.
@@ -367,3 +377,4 @@ int paste_selection(struct tty_struct *tty)
tty_ldisc_deref(ld);
return 0;
}
+EXPORT_SYMBOL_GPL(paste_selection);
diff --git a/include/linux/selection.h b/include/linux/selection.h
index a8f5b97b216f..171d77dfc825 100644
--- a/include/linux/selection.h
+++ b/include/linux/selection.h
@@ -11,13 +11,12 @@
#include <linux/tiocl.h>
#include <linux/vt_buffer.h>

-struct tty_struct;
-
extern struct vc_data *sel_cons;
struct tty_struct;

extern void clear_selection(void);
extern int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *tty);
+extern int do_set_selection(struct tiocl_selection *v, struct tty_struct *tty);
extern int paste_selection(struct tty_struct *tty);
extern int sel_loadlut(char __user *p);
extern int mouse_reporting(void);
--
2.21.0
\
 
 \ /
  Last update: 2019-04-04 21:49    [W:0.101 / U:0.844 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site