diff options
| author | Jiri Slaby <jslaby@suse.cz> | 2020-02-28 12:54:05 +0100 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2020-04-28 19:03:42 +0100 |
| commit | f443603c73b85db566373875ca8890ef0910f083 (patch) | |
| tree | 87509e2d839900dc44a6d714eb625468cc77bedb | |
| parent | a93c3b40fc3d2264b1b11c469319c7cbefb80c46 (diff) | |
| download | linux-stable-f443603c73b85db566373875ca8890ef0910f083.tar.gz | |
vt: selection, push console lock down
commit 4b70dd57a15d2f4685ac6e38056bad93e81e982f upstream.
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")
Link: https://lore.kernel.org/r/20200228115406.5735-1-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -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 4f7875cf99bd79..f74ce94a08ce26 100644 --- a/drivers/tty/vt/selection.c +++ b/drivers/tty/vt/selection.c @@ -158,7 +158,7 @@ static int store_utf8(u16 c, char *p) * 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) +static int __set_selection(const struct tiocl_selection __user *sel, struct tty_struct *tty) { struct vc_data *vc = vc_cons[fg_console].d; int sel_mode, new_sel_start, new_sel_end, spc; @@ -334,6 +334,17 @@ unlock: return ret; } +int set_selection(const struct tiocl_selection __user *v, struct tty_struct *tty) +{ + int ret; + + console_lock(); + ret = __set_selection(v, tty); + console_unlock(); + + return ret; +} + /* Insert the contents of the selection buffer into the * queue of the tty associated with the current console. * Invoked by ioctl(). diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 6f5d249d454d19..b9d4075ddc176e 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -2670,9 +2670,7 @@ int tioclinux(struct tty_struct *tty, unsigned long arg) switch (type) { case TIOCL_SETSEL: - console_lock(); ret = set_selection((struct tiocl_selection __user *)(p+1), tty); - console_unlock(); break; case TIOCL_PASTESEL: ret = paste_selection(tty); |