diff options
authorPaul Mackerras <>2005-08-28 09:40:01 +1000
committerLinus Torvalds <>2005-08-27 18:03:42 -0700
commitf786648b89f00d4e66fe6b19beffd30e764651fc (patch)
parent3859f6a248cbdfbe7b41663f3a2b51f48e30b281 (diff)
[PATCH] Remove race between con_open and con_close
[ Same race and same patch also by Steven Rostedt <> ] I have a laptop (G3 powerbook) which will pretty reliably hit a race between con_open and con_close late in the boot process and oops in vt_ioctl due to tty->driver_data being NULL. What happens is this: process A opens /dev/tty6; it comes into con_open() (drivers/char/vt.c) and assign a non-NULL value to tty->driver_data. Then process A closes that and concurrently process B opens /dev/tty6. Process A gets through con_close() and clears tty->driver_data, since tty->count == 1. However, before process A can decrement tty->count, we switch to process B (e.g. at the down(&tty_sem) call at drivers/char/tty_io.c line 1626). So process B gets to run and comes into con_open with tty->count == 2, as tty->count is incremented (in init_dev) before con_open is called. Because tty->count != 1, we don't set tty->driver_data. Then when the process tries to do anything with that fd, it oopses. The simple and effective fix for this is to test tty->driver_data rather than tty->count in con_open. The testing and setting of tty->driver_data is serialized with respect to the clearing of tty->driver_data in con_close by the console_sem. We can't get a situation where con_open sees tty->driver_data != NULL and then con_close on a different fd clears tty->driver_data, because tty->count is incremented before con_open is called. Thus this patch eliminates the race, and in fact with this patch my laptop doesn't oops. Signed-off-by: Paul Mackerras <> [ Same patch Signed-off-by: Steven Rostedt <> in ] Signed-off-by: Linus Torvalds <>
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 30d96739fb2..665103ccaee 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -2433,7 +2433,7 @@ static int con_open(struct tty_struct *tty, struct file *filp)
int ret = 0;
- if (tty->count == 1) {
+ if (tty->driver_data == NULL) {
ret = vc_allocate(currcons);
if (ret == 0) {
struct vc_data *vc = vc_cons[currcons].d;