xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

tty: ldisc: add sysctl to prevent autoloading of ldiscs

Browse Source 
By default, the kernel will automatically load the module of any line
dicipline that is asked for.  As this sometimes isn't the safest thing
to do, provide a sysctl to disable this feature.

By default, we set this to 'y' as that is the historical way that Linux
has worked, and we do not want to break working systems.  But in the
future, perhaps this can default to 'n' to prevent this functionality.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman
2019-01-21 17:26:42 +01:00
parent 83b21ed0fc
commit 7c0cca7c84
3 changed files with 74 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/tty/tty_io.c
View File

@@ -513,6 +513,8 @@ static const struct file_operations hung_up_tty_fops = {
static DEFINE_SPINLOCK(redirect_lock);
static struct file *redirect;
extern void tty_sysctl_init(void);
/**
* tty_wakeup - request more data
* @tty: terminal
@@ -3483,6 +3485,7 @@ void console_sysfs_notify(void)
*/
int __init tty_init(void)
{
tty_sysctl_init();
cdev_init(&tty_cdev, &tty_fops);
if (cdev_add(&tty_cdev, MKDEV(TTYAUX_MAJOR, 0), 1) ||
register_chrdev_region(MKDEV(TTYAUX_MAJOR, 0), 1, "/dev/tty") < 0)