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authorLiz Clark <liz.clark@hp.com>2012-03-15 10:33:29 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-02 09:26:53 -0700
commiteb49cf6c6945f4fd5cb6fc1281b2ebfc34b15083 (patch)
treeb228b4319650cdaafb0be17f4ba4107322398aa9 /drivers/tty
parent3fc869e8213e87c41f9c05be8bcfd2ebb17253f3 (diff)
TTY: Wrong unicode value copied in con_set_unimap()
commit 4a4c61b7ce26bfc9d49ea4bd121d52114bad9f99 upstream. Bugzilla 40012: PIO_UNIMAP bug: error updating Unicode-to-font map https://bugzilla.kernel.org/show_bug.cgi?id=40012 The unicode font map for the virtual console is a 32x32x64 table which allocates rows dynamically as entries are added. The unicode value increases sequentially and should count all entries even in empty rows. The defect is when copying the unicode font map in con_set_unimap(), the unicode value is not incremented properly. The wrong unicode value is entered in the new font map. Signed-off-by: Liz Clark <liz.clark@hp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/vt/consolemap.c51
1 files changed, 43 insertions, 8 deletions
diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c
index 45d3e80156d4..f3438083a285 100644
--- a/drivers/tty/vt/consolemap.c
+++ b/drivers/tty/vt/consolemap.c
@@ -516,6 +516,7 @@ int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
int err = 0, err1, i;
struct uni_pagedir *p, *q;
+ /* Save original vc_unipagdir_loc in case we allocate a new one */
p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
if (p->readonly) return -EIO;
@@ -528,26 +529,57 @@ int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
err1 = con_clear_unimap(vc, NULL);
if (err1) return err1;
+ /*
+ * Since refcount was > 1, con_clear_unimap() allocated a
+ * a new uni_pagedir for this vc. Re: p != q
+ */
q = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
- for (i = 0, l = 0; i < 32; i++)
+
+ /*
+ * uni_pgdir is a 32*32*64 table with rows allocated
+ * when its first entry is added. The unicode value must
+ * still be incremented for empty rows. We are copying
+ * entries from "p" (old) to "q" (new).
+ */
+ l = 0; /* unicode value */
+ for (i = 0; i < 32; i++)
if ((p1 = p->uni_pgdir[i]))
for (j = 0; j < 32; j++)
- if ((p2 = p1[j]))
+ if ((p2 = p1[j])) {
for (k = 0; k < 64; k++, l++)
if (p2[k] != 0xffff) {
+ /*
+ * Found one, copy entry for unicode
+ * l with fontpos value p2[k].
+ */
err1 = con_insert_unipair(q, l, p2[k]);
if (err1) {
p->refcount++;
*vc->vc_uni_pagedir_loc = (unsigned long)p;
con_release_unimap(q);
kfree(q);
- return err1;
+ return err1;
}
- }
- p = q;
- } else if (p == dflt)
+ }
+ } else {
+ /* Account for row of 64 empty entries */
+ l += 64;
+ }
+ else
+ /* Account for empty table */
+ l += 32 * 64;
+
+ /*
+ * Finished copying font table, set vc_uni_pagedir to new table
+ */
+ p = q;
+ } else if (p == dflt) {
dflt = NULL;
-
+ }
+
+ /*
+ * Insert user specified unicode pairs into new table.
+ */
while (ct--) {
unsigned short unicode, fontpos;
__get_user(unicode, &list->unicode);
@@ -557,11 +589,14 @@ int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
list++;
}
+ /*
+ * Merge with fontmaps of any other virtual consoles.
+ */
if (con_unify_unimap(vc, p))
return err;
for (i = 0; i <= 3; i++)
- set_inverse_transl(vc, p, i); /* Update all inverse translations */
+ set_inverse_transl(vc, p, i); /* Update inverse translations */
set_inverse_trans_unicode(vc, p);
return err;