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authorSamuel Thibault <samuel.thibault@ens-lyon.org>2006-08-27 01:23:39 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-08-27 11:01:29 -0700
commit533475d3d48eb839be2b57f6b020150abae91063 (patch)
tree04145dcb5d7499fb2f8899a42ac0350c6e55203a /drivers/char
parentb8cf368944807e29b16b24588a2a35c829bc9d9a (diff)
downloadop-kernel-dev-533475d3d48eb839be2b57f6b020150abae91063.zip
op-kernel-dev-533475d3d48eb839be2b57f6b020150abae91063.tar.gz
[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')
-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 eccffaf..a5628a8 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,
return -EPERM;
vt_dont_switch = 0;
return 0;
+ case VT_GETHIFONTMASK:
+ return put_user(vc->vc_hi_font_mask, (unsigned short __user *)arg);
default:
return -ENOIOCTLCMD;
}
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