diff options
| author |   Peter Hurley <peter@hurleysoftware.com> | 2013-06-15 09:36:15 -0400 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-23 16:47:10 -0700 |
| commit | a7c8d58c79853adeebf0a1ddc9c63e433b4d97f1 (patch) | |
| tree | 328d40837fb13c7856d3aae2be663093fa6278e0 /drivers/tty/vt/selection.c | |
| parent | tty: Merge __tty_flush_buffer() into lone call site (diff) | |
| download | wireguard-linux-a7c8d58c79853adeebf0a1ddc9c63e433b4d97f1.tar.xz wireguard-linux-a7c8d58c79853adeebf0a1ddc9c63e433b4d97f1.zip | |
tty: Fix unsafe vt paste_selection()
Convert the tty_buffer_flush() exclusion mechanism to a
public interface - tty_buffer_lock/unlock_exclusive() - and use
the interface to safely write the paste selection to the line
discipline.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/vt/selection.c')
| -rw-r--r-- | drivers/tty/vt/selection.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c index 2ca8d6b6514c..ea27804d87af 100644 --- a/drivers/tty/vt/selection.c +++ b/drivers/tty/vt/selection.c @@ -24,6 +24,7 @@ #include <linux/selection.h> #include <linux/tiocl.h> #include <linux/console.h> +#include <linux/tty_flip.h> /* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */ #define isspace(c) ((c) == ' ') @@ -346,8 +347,8 @@ int paste_selection(struct tty_struct *tty) console_unlock(); ld = tty_ldisc_ref_wait(tty); + tty_buffer_lock_exclusive(&vc->port); - /* FIXME: this is completely unsafe */ add_wait_queue(&vc->paste_wait, &wait); while (sel_buffer && sel_buffer_lth > pasted) { set_current_state(TASK_INTERRUPTIBLE); @@ -363,6 +364,7 @@ int paste_selection(struct tty_struct *tty) remove_wait_queue(&vc->paste_wait, &wait); __set_current_state(TASK_RUNNING); + tty_buffer_unlock_exclusive(&vc->port); tty_ldisc_deref(ld); return 0; } |