This function is largely a duplicate of paste_selection() in drivers/tty/vt/selection.c, but with its own selection state. The speakup selection mechanism should really be merged with vt. For now, apply the changes from 'TTY: vt, fix paste_selection ldisc handling', 'tty: Make ldisc input flow control concurrency-friendly', and 'tty: Fix unsafe vt paste_selection()'. References: https://bugs.debian.org/735202 References: https://bugs.debian.org/744015 Reported-by: Paul Gevers <elbrus@xxxxxxxxxx> Reported-and-tested-by: Jarek Czekalski <jarekczek@xxxxxxxxxxxxxx> Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> # v3.8 but needs backporting for < 3.12 --- drivers/staging/speakup/selection.c | 14 +++++++++++--- drivers/tty/tty_buffer.c | 2 ++ 2 files changed, 13 insertions(+), 3 deletions(-) diff --git a/drivers/staging/speakup/selection.c b/drivers/staging/speakup/selection.c index f67941e..ca04d36 100644 --- a/drivers/staging/speakup/selection.c +++ b/drivers/staging/speakup/selection.c @@ -5,6 +5,8 @@ #include <linux/device.h> /* for dev_warn */ #include <linux/selection.h> #include <linux/workqueue.h> +#include <linux/tty.h> +#include <linux/tty_flip.h> #include <asm/cmpxchg.h> #include "speakup.h" @@ -135,8 +137,12 @@ static void __speakup_paste_selection(struct work_struct *work) struct tty_struct *tty = xchg(&spw->tty, NULL); struct vc_data *vc = (struct vc_data *) tty->driver_data; int pasted = 0, count; + struct tty_ldisc *ld; DECLARE_WAITQUEUE(wait, current); + ld = tty_ldisc_ref_wait(tty); + tty_buffer_lock_exclusive(&vc->port); + add_wait_queue(&vc->paste_wait, &wait); while (sel_buffer && sel_buffer_lth > pasted) { set_current_state(TASK_INTERRUPTIBLE); @@ -145,13 +151,15 @@ static void __speakup_paste_selection(struct work_struct *work) continue; } count = sel_buffer_lth - pasted; - count = min_t(int, count, tty->receive_room); - tty->ldisc->ops->receive_buf(tty, sel_buffer + pasted, - NULL, count); + count = tty_ldisc_receive_buf(ld, sel_buffer + pasted, NULL, + count); pasted += count; } remove_wait_queue(&vc->paste_wait, &wait); current->state = TASK_RUNNING; + + tty_buffer_unlock_exclusive(&vc->port); + tty_ldisc_deref(ld); tty_kref_put(tty); } diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c index cf78d19..143deb6 100644 --- a/drivers/tty/tty_buffer.c +++ b/drivers/tty/tty_buffer.c @@ -60,6 +60,7 @@ void tty_buffer_lock_exclusive(struct tty_port *port) atomic_inc(&buf->priority); mutex_lock(&buf->lock); } +EXPORT_SYMBOL_GPL(tty_buffer_lock_exclusive); void tty_buffer_unlock_exclusive(struct tty_port *port) { @@ -73,6 +74,7 @@ void tty_buffer_unlock_exclusive(struct tty_port *port) if (restart) queue_work(system_unbound_wq, &buf->work); } +EXPORT_SYMBOL_GPL(tty_buffer_unlock_exclusive); /** * tty_buffer_space_avail - return unused buffer space -- Ben Hutchings It is easier to change the specification to fit the program than vice versa.
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