diff options
| -rw-r--r-- | drivers/tty/vt/selection.c | 39 | ||||
| -rw-r--r-- | drivers/tty/vt/vt.c | 2 |
2 files changed, 33 insertions, 8 deletions
diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c index 2a509167092..8e9b4be97a2 100644 --- a/drivers/tty/vt/selection.c +++ b/drivers/tty/vt/selection.c @@ -62,10 +62,14 @@ sel_pos(int n) use_unicode); } -/* remove the current selection highlight, if any, - from the console holding the selection. */ -void -clear_selection(void) { +/** + * clear_selection - remove current selection + * + * Remove the current selection highlight, if any from the console + * holding the selection. The caller must hold the console lock. + */ +void clear_selection(void) +{ highlight_pointer(-1); /* hide the pointer */ if (sel_start != -1) { highlight(sel_start, sel_end); @@ -75,7 +79,7 @@ clear_selection(void) { /* * User settable table: what characters are to be considered alphabetic? - * 256 bits. FIXME: Needs a locking model. + * 256 bits. Locked by the console lock. */ static u32 inwordLut[8]={ 0x00000000, /* control chars */ @@ -92,10 +96,20 @@ static inline int inword(const u16 c) { return c > 0xff || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1); } -/* set inwordLut contents. Invoked by ioctl(). */ +/** + * set loadlut - load the LUT table + * @p: user table + * + * Load the LUT table from user space. The caller must hold the console + * lock. Make a temporary copy so a partial update doesn't make a mess. + */ int sel_loadlut(char __user *p) { - return copy_from_user(inwordLut, (u32 __user *)(p+4), 32) ? -EFAULT : 0; + u32 tmplut[8]; + if (copy_from_user(tmplut, (u32 __user *)(p+4), 32)) + return -EFAULT; + memcpy(inwordLut, tmplut, 32); + return 0; } /* does screen address p correspond to character at LH/RH edge of screen? */ @@ -131,7 +145,16 @@ static int store_utf8(u16 c, char *p) } } -/* set the current selection. Invoked by ioctl() or by kernel code. */ +/** + * set_selection - set the current selection. + * @sel: user selection info + * @tty: the console tty + * + * Invoked by the ioctl handle for the vt layer. + * + * The entire selection process is managed under the console_lock. It's + * a lot under the lock but its hardly a performance path + */ int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *tty) { struct vc_data *vc = vc_cons[fg_console].d; diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index ab7385e526a..e5abceacc2d 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -2623,7 +2623,9 @@ int tioclinux(struct tty_struct *tty, unsigned long arg) console_unlock(); break; case TIOCL_SELLOADLUT: + console_lock(); ret = sel_loadlut(p); + console_unlock(); break; case TIOCL_GETSHIFTSTATE: |