diff options
| author | Jiri Slaby <jslaby@suse.cz> | 2020-02-28 14:54:05 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-28 18:06:49 +0300 |
| commit | 4b70dd57a15d2f4685ac6e38056bad93e81e982f (patch) | |
| tree | 99092eb75291a1ebc0f01c69fc4dac5d73cb8645 /drivers/tty | |
| parent | f8788d86ab28f61f7b46eb6be375f8a726783636 (diff) | |
| download | linux-4b70dd57a15d2f4685ac6e38056bad93e81e982f.tar.xz | |
vt: selection, push console lock down
We need to nest the console lock in sel_lock, so we have to push it down
a bit. Fortunately, the callers of set_selection_* just lock the console
lock around the function call. So moving it down is easy.
In the next patch, we switch the order.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Fixes: 07e6124a1a46 ("vt: selection, close sel_buffer race")
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200228115406.5735-1-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/vt/selection.c | 13 | ||||
| -rw-r--r-- | drivers/tty/vt/vt.c | 2 |
2 files changed, 12 insertions, 3 deletions
diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c index 0c50d7410b31..9126a01290ea 100644 --- a/drivers/tty/vt/selection.c +++ b/drivers/tty/vt/selection.c @@ -181,7 +181,7 @@ int set_selection_user(const struct tiocl_selection __user *sel, return set_selection_kernel(&v, tty); } -int set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty) +static int __set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty) { struct vc_data *vc = vc_cons[fg_console].d; int new_sel_start, new_sel_end, spc; @@ -343,6 +343,17 @@ unlock: mutex_unlock(&sel_lock); return ret; } + +int set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty) +{ + int ret; + + console_lock(); + ret = __set_selection_kernel(v, tty); + console_unlock(); + + return ret; +} EXPORT_SYMBOL_GPL(set_selection_kernel); /* Insert the contents of the selection buffer into the diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 0cfbb7182b5a..15d27698054a 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -3046,10 +3046,8 @@ int tioclinux(struct tty_struct *tty, unsigned long arg) switch (type) { case TIOCL_SETSEL: - console_lock(); ret = set_selection_user((struct tiocl_selection __user *)(p+1), tty); - console_unlock(); break; case TIOCL_PASTESEL: ret = paste_selection(tty); |