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vt: selection: allow functions to be called from inside kernel

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This patch breaks set_selection() into two functions so that when
called from kernel, copy_from_user() can be avoided. The two functions
are called set_selection_user() and set_selection_kernel() in order to
be explicit about their purposes. This also means updating any
references to set_selection() and fixing for name change. It also
exports set_selection_kernel() 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Okash Khawaja 2019-04-17 13:21:13 +01:00 committed by Greg Kroah-Hartman
parent 827c085bae
commit 496124e5e1
3 changed files with 38 additions and 22 deletions
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46
drivers/tty/vt/selection.c
View File

@ -2,7 +2,9 @@
/*
* This module exports the functions:
*
* 'int set_selection(struct tiocl_selection __user *, struct tty_struct *)'
* 'int set_selection_user(struct tiocl_selection __user *,
* struct tty_struct *)'
* 'int set_selection_kernel(struct tiocl_selection *, struct tty_struct *)'
* 'void clear_selection(void)'
* 'int paste_selection(struct tty_struct *)'
* 'int sel_loadlut(char __user *)'
@ -80,6 +82,7 @@ void clear_selection(void)
sel_start = -1;
}
}
EXPORT_SYMBOL_GPL(clear_selection);
/*
* User settable table: what characters are to be considered alphabetic?
@ -154,7 +157,7 @@ static int store_utf8(u32 c, char *p)
}
/**
* set_selection - set the current selection.
* set_selection_user - set the current selection.
* @sel: user selection info
* @tty: the console tty
*
@ -163,35 +166,44 @@ static int store_utf8(u32 c, char *p)
* The entire selection process is managed under the console_lock. It's
* a lot under the lock but its hardly a performance path
*/
int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *tty)
int set_selection_user(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 set_selection_kernel(&v, tty);
}
int set_selection_kernel(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 +220,7 @@ 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 +334,7 @@ int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *t
sel_buffer_lth = bp - sel_buffer;
return 0;
}
EXPORT_SYMBOL_GPL(set_selection_kernel);
/* Insert the contents of the selection buffer into the
* queue of the tty associated with the current console.
@ -367,3 +380,4 @@ int paste_selection(struct tty_struct *tty)
tty_ldisc_deref(ld);
return 0;
}
EXPORT_SYMBOL_GPL(paste_selection);

7
drivers/tty/vt/vt.c
View File

@ -1804,7 +1804,7 @@ void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
respond_string(buf, tty->port);
}
/* invoked via ioctl(TIOCLINUX) and through set_selection */
/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
int mouse_reporting(void)
{
return vc_cons[fg_console].d->vc_report_mouse;
@ -3008,7 +3008,7 @@ static struct console vt_console_driver = {
* There are some functions which can sleep for arbitrary periods
* (paste_selection) but we don't need the lock there anyway.
*
* set_selection has locking, and definitely needs it
* set_selection_user has locking, and definitely needs it
*/
int tioclinux(struct tty_struct *tty, unsigned long arg)
@ -3028,7 +3028,8 @@ int tioclinux(struct tty_struct *tty, unsigned long arg)
{
case TIOCL_SETSEL:
console_lock();
ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ret = set_selection_user((struct tiocl_selection
__user *)(p+1), tty);
console_unlock();
break;
case TIOCL_PASTESEL:

7
include/linux/selection.h
View File

@ -11,13 +11,14 @@
#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 set_selection_user(const struct tiocl_selection __user *sel,
struct tty_struct *tty);
extern int set_selection_kernel(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);