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Subjectvt.c: unimap changes to (fg_?)console
Hi Linus, Alan, Andries,

if you open /dev/tty4 and change the font via ioctl(KDFONTOP), it will be
applied to the opened console, i.e. tty4. Then you set the corresponding
unicodemap via PIO_UNIMAPCLR and PIO_UNIMAP ioctls. Those get applied to the
current foreground console. Which is inconsistent.

Looking at vt.c: vt_ioctl(), the situation is a bit messy: Some ioctls don't
explicitly specify a tty (probably not needed, as some settings are global),
some apply to fg_console, some apply to the opened console which is
((struct vt_struct*)tty->driver_data)->vc_num.

I would appreciate, if somebody with more knowledge could have a look and
check whether this is all correct. At least for the above case, it's not.
(Andries, I would appreciate if you have a look; you understand much more of
it than I do.)

I attach a patch to fix the specific problem reported above. It applies to
both 2.4.4 and 2.2.19. ioctl(PIO_UNIMAP[CLR]) is applied to the opened
console now instead of fg_console.
Please apply until somebody comes with a complete vt.c cleanup!

If you want to test yourself: I also have a patch against kbd-1.05
which allows you to use setfont -c /dev/ttyXX to specify which terminal you
want to. I already sent it to Andries.

Kurt Garloff <> Eindhoven, NL
GPG key: See mail header, key servers Linux kernel development
SuSE GmbH, Nuernberg, FRG SCSI, Security
--- linux-244.compile/drivers/char/vt.c.orig Fri Feb 9 20:30:22 2001
+++ linux-244.compile/drivers/char/vt.c Mon May 7 10:37:25 2001
@@ -392,7 +392,7 @@

static inline int
-do_unimap_ioctl(int cmd, struct unimapdesc *user_ud,int perm)
+do_unimap_ioctl(int cmd, struct unimapdesc *user_ud, int perm, unsigned int console)
struct unimapdesc tmp;
int i = 0;
@@ -408,9 +408,11 @@
if (!perm)
return -EPERM;
- return con_set_unimap(fg_console, tmp.entry_ct, tmp.entries);
+ return con_set_unimap(console, tmp.entry_ct, tmp.entries);
- return con_get_unimap(fg_console, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries);
+ if (!perm && fg_console != console)
+ return -EPERM;
+ return con_get_unimap(console, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries);
return 0;
@@ -1029,13 +1031,13 @@
return -EPERM;
i = copy_from_user(&ui, (void *)arg, sizeof(struct unimapinit));
if (i) return -EFAULT;
- con_clear_unimap(fg_console, &ui);
+ con_clear_unimap(console, &ui);
return 0;

- return do_unimap_ioctl(cmd, (struct unimapdesc *)arg, perm);
+ return do_unimap_ioctl(cmd, (struct unimapdesc *)arg, perm, console);

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