aboutsummaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/vt.c3
-rw-r--r--drivers/char/vt_ioctl.c203
2 files changed, 206 insertions, 0 deletions
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 33214d92ca4..5dfbfa7d760 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -2910,6 +2910,9 @@ static const struct tty_operations con_ops = {
.flush_chars = con_flush_chars,
.chars_in_buffer = con_chars_in_buffer,
.ioctl = vt_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = vt_compat_ioctl,
+#endif
.stop = con_stop,
.start = con_start,
.throttle = con_throttle,
diff --git a/drivers/char/vt_ioctl.c b/drivers/char/vt_ioctl.c
index 0fceb8f4d6f..30b5d128037 100644
--- a/drivers/char/vt_ioctl.c
+++ b/drivers/char/vt_ioctl.c
@@ -16,6 +16,7 @@
#include <linux/tty.h>
#include <linux/timer.h>
#include <linux/kernel.h>
+#include <linux/compat.h>
#include <linux/module.h>
#include <linux/kd.h>
#include <linux/vt.h>
@@ -1376,6 +1377,208 @@ void vc_SAK(struct work_struct *work)
release_console_sem();
}
+#ifdef CONFIG_COMPAT
+
+struct compat_consolefontdesc {
+ unsigned short charcount; /* characters in font (256 or 512) */
+ unsigned short charheight; /* scan lines per character (1-32) */
+ compat_caddr_t chardata; /* font data in expanded form */
+};
+
+static inline int
+compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd,
+ int perm, struct console_font_op *op)
+{
+ struct compat_consolefontdesc cfdarg;
+ int i;
+
+ if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc)))
+ return -EFAULT;
+
+ switch (cmd) {
+ case PIO_FONTX:
+ if (!perm)
+ return -EPERM;
+ op->op = KD_FONT_OP_SET;
+ op->flags = KD_FONT_FLAG_OLD;
+ op->width = 8;
+ op->height = cfdarg.charheight;
+ op->charcount = cfdarg.charcount;
+ op->data = compat_ptr(cfdarg.chardata);
+ return con_font_op(vc_cons[fg_console].d, op);
+ case GIO_FONTX:
+ op->op = KD_FONT_OP_GET;
+ op->flags = KD_FONT_FLAG_OLD;
+ op->width = 8;
+ op->height = cfdarg.charheight;
+ op->charcount = cfdarg.charcount;
+ op->data = compat_ptr(cfdarg.chardata);
+ i = con_font_op(vc_cons[fg_console].d, op);
+ if (i)
+ return i;
+ cfdarg.charheight = op->height;
+ cfdarg.charcount = op->charcount;
+ if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc)))
+ return -EFAULT;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+struct compat_console_font_op {
+ compat_uint_t op; /* operation code KD_FONT_OP_* */
+ compat_uint_t flags; /* KD_FONT_FLAG_* */
+ compat_uint_t width, height; /* font size */
+ compat_uint_t charcount;
+ compat_caddr_t data; /* font data with height fixed to 32 */
+};
+
+static inline int
+compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop,
+ int perm, struct console_font_op *op, struct vc_data *vc)
+{
+ int i;
+
+ if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op)))
+ return -EFAULT;
+ if (!perm && op->op != KD_FONT_OP_GET)
+ return -EPERM;
+ op->data = compat_ptr(((struct compat_console_font_op *)op)->data);
+ op->flags |= KD_FONT_FLAG_OLD;
+ i = con_font_op(vc, op);
+ if (i)
+ return i;
+ ((struct compat_console_font_op *)op)->data = (unsigned long)op->data;
+ if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op)))
+ return -EFAULT;
+ return 0;
+}
+
+struct compat_unimapdesc {
+ unsigned short entry_ct;
+ compat_caddr_t entries;
+};
+
+static inline int
+compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud,
+ int perm, struct vc_data *vc)
+{
+ struct compat_unimapdesc tmp;
+ struct unipair __user *tmp_entries;
+
+ if (copy_from_user(&tmp, user_ud, sizeof tmp))
+ return -EFAULT;
+ tmp_entries = compat_ptr(tmp.entries);
+ if (tmp_entries)
+ if (!access_ok(VERIFY_WRITE, tmp_entries,
+ tmp.entry_ct*sizeof(struct unipair)))
+ return -EFAULT;
+ switch (cmd) {
+ case PIO_UNIMAP:
+ if (!perm)
+ return -EPERM;
+ return con_set_unimap(vc, tmp.entry_ct, tmp_entries);
+ case GIO_UNIMAP:
+ if (!perm && fg_console != vc->vc_num)
+ return -EPERM;
+ return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries);
+ }
+ return 0;
+}
+
+long vt_compat_ioctl(struct tty_struct *tty, struct file * file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct vc_data *vc = tty->driver_data;
+ struct console_font_op op; /* used in multiple places here */
+ struct kbd_struct *kbd;
+ unsigned int console;
+ void __user *up = (void __user *)arg;
+ int perm;
+ int ret = 0;
+
+ console = vc->vc_num;
+
+ lock_kernel();
+
+ if (!vc_cons_allocated(console)) { /* impossible? */
+ ret = -ENOIOCTLCMD;
+ goto out;
+ }
+
+ /*
+ * To have permissions to do most of the vt ioctls, we either have
+ * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
+ */
+ perm = 0;
+ if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
+ perm = 1;
+
+ kbd = kbd_table + console;
+ switch (cmd) {
+ /*
+ * these need special handlers for incompatible data structures
+ */
+ case PIO_FONTX:
+ case GIO_FONTX:
+ ret = compat_fontx_ioctl(cmd, up, perm, &op);
+ break;
+
+ case KDFONTOP:
+ ret = compat_kdfontop_ioctl(up, perm, &op, vc);
+ break;
+
+ case PIO_UNIMAP:
+ case GIO_UNIMAP:
+ ret = do_unimap_ioctl(cmd, up, perm, vc);
+ break;
+
+ /*
+ * all these treat 'arg' as an integer
+ */
+ case KIOCSOUND:
+ case KDMKTONE:
+#ifdef CONFIG_X86
+ case KDADDIO:
+ case KDDELIO:
+#endif
+ case KDSETMODE:
+ case KDMAPDISP:
+ case KDUNMAPDISP:
+ case KDSKBMODE:
+ case KDSKBMETA:
+ case KDSKBLED:
+ case KDSETLED:
+ case KDSIGACCEPT:
+ case VT_ACTIVATE:
+ case VT_WAITACTIVE:
+ case VT_RELDISP:
+ case VT_DISALLOCATE:
+ case VT_RESIZE:
+ case VT_RESIZEX:
+ goto fallback;
+
+ /*
+ * the rest has a compatible data structure behind arg,
+ * but we have to convert it to a proper 64 bit pointer.
+ */
+ default:
+ arg = (unsigned long)compat_ptr(arg);
+ goto fallback;
+ }
+out:
+ unlock_kernel();
+ return ret;
+
+fallback:
+ unlock_kernel();
+ return vt_ioctl(tty, file, cmd, arg);
+}
+
+
+#endif /* CONFIG_COMPAT */
+
+
/*
* Performs the back end of a vt switch. Called under the console
* semaphore.