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authorSamuel Thibault <samuel.thibault@ens-lyon.org>2006-08-27 04:23:39 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-08-27 14:01:29 -0400
commit533475d3d48eb839be2b57f6b020150abae91063 (patch)
tree04145dcb5d7499fb2f8899a42ac0350c6e55203a /drivers/char/vt_ioctl.c
parentb8cf368944807e29b16b24588a2a35c829bc9d9a (diff)
[PATCH] vcsa attribute bits -> ioctl(VT_GETHIFONTMASK)
When reading /dev/vcsa while a font with more than 256 characters is loaded, one of the attribute bits records the 9th bit of the character. But depending on the console driver (vgacon or fbcon for instance), that's bit 3 or bit 0. And there is no way for userland to know that, thus no way for userland to safely grab the screen content. So here is a (tested) patch: Add a VT_GETHIFONTMASK ioctl for knowing which bit is the 9th bit for VC text (vc_hi_font_mask field of the vc_data structure). Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char/vt_ioctl.c')
-rw-r--r--drivers/char/vt_ioctl.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/char/vt_ioctl.c b/drivers/char/vt_ioctl.c
index eccffaf26faa..a5628a8b6620 100644
--- a/drivers/char/vt_ioctl.c
+++ b/drivers/char/vt_ioctl.c
@@ -1011,6 +1011,8 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
1011 return -EPERM; 1011 return -EPERM;
1012 vt_dont_switch = 0; 1012 vt_dont_switch = 0;
1013 return 0; 1013 return 0;
1014 case VT_GETHIFONTMASK:
1015 return put_user(vc->vc_hi_font_mask, (unsigned short __user *)arg);
1014 default: 1016 default:
1015 return -ENOIOCTLCMD; 1017 return -ENOIOCTLCMD;
1016 } 1018 }