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path: root/drivers/tty/vt/keyboard.c
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Diffstat (limited to 'drivers/tty/vt/keyboard.c')
-rw-r--r--drivers/tty/vt/keyboard.c35
1 files changed, 28 insertions, 7 deletions
diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
index 88312c6c92cc..515fc095e3b4 100644
--- a/drivers/tty/vt/keyboard.c
+++ b/drivers/tty/vt/keyboard.c
@@ -123,6 +123,7 @@ static const int NR_TYPES = ARRAY_SIZE(max_vals);
static struct input_handler kbd_handler;
static DEFINE_SPINLOCK(kbd_event_lock);
static DEFINE_SPINLOCK(led_lock);
+static DEFINE_SPINLOCK(func_buf_lock); /* guard 'func_buf' and friends */
static unsigned long key_down[BITS_TO_LONGS(KEY_CNT)]; /* keyboard key bitmap */
static unsigned char shift_down[NR_SHIFT]; /* shift state counters.. */
static bool dead_key_next;
@@ -1449,7 +1450,7 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
KBD_UNICODE, &param);
if (rc != NOTIFY_STOP)
if (down && !raw_mode)
- to_utf8(vc, keysym);
+ k_unicode(vc, keysym, !down);
return;
}
@@ -1990,11 +1991,12 @@ int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
char *p;
u_char *q;
u_char __user *up;
- int sz;
+ int sz, fnw_sz;
int delta;
char *first_free, *fj, *fnw;
int i, j, k;
int ret;
+ unsigned long flags;
if (!capable(CAP_SYS_TTY_CONFIG))
perm = 0;
@@ -2037,7 +2039,14 @@ int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
goto reterr;
}
+ fnw = NULL;
+ fnw_sz = 0;
+ /* race aginst other writers */
+ again:
+ spin_lock_irqsave(&func_buf_lock, flags);
q = func_table[i];
+
+ /* fj pointer to next entry after 'q' */
first_free = funcbufptr + (funcbufsize - funcbufleft);
for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++)
;
@@ -2045,10 +2054,12 @@ int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
fj = func_table[j];
else
fj = first_free;
-
+ /* buffer usage increase by new entry */
delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string);
+
if (delta <= funcbufleft) { /* it fits in current buf */
if (j < MAX_NR_FUNC) {
+ /* make enough space for new entry at 'fj' */
memmove(fj + delta, fj, first_free - fj);
for (k = j; k < MAX_NR_FUNC; k++)
if (func_table[k])
@@ -2061,20 +2072,28 @@ int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
sz = 256;
while (sz < funcbufsize - funcbufleft + delta)
sz <<= 1;
- fnw = kmalloc(sz, GFP_KERNEL);
- if(!fnw) {
- ret = -ENOMEM;
- goto reterr;
+ if (fnw_sz != sz) {
+ spin_unlock_irqrestore(&func_buf_lock, flags);
+ kfree(fnw);
+ fnw = kmalloc(sz, GFP_KERNEL);
+ fnw_sz = sz;
+ if (!fnw) {
+ ret = -ENOMEM;
+ goto reterr;
+ }
+ goto again;
}
if (!q)
func_table[i] = fj;
+ /* copy data before insertion point to new location */
if (fj > funcbufptr)
memmove(fnw, funcbufptr, fj - funcbufptr);
for (k = 0; k < j; k++)
if (func_table[k])
func_table[k] = fnw + (func_table[k] - funcbufptr);
+ /* copy data after insertion point to new location */
if (first_free > fj) {
memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj);
for (k = j; k < MAX_NR_FUNC; k++)
@@ -2087,7 +2106,9 @@ int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
funcbufleft = funcbufleft - delta + sz - funcbufsize;
funcbufsize = sz;
}
+ /* finally insert item itself */
strcpy(func_table[i], kbs->kb_string);
+ spin_unlock_irqrestore(&func_buf_lock, flags);
break;
}
ret = 0;