tty: ldisc: add sysctl to prevent autoloading of ldiscs

commit 7c0cca7c847e6e019d67b7d793efbbe3b947d004 upstream.

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>

diff --git a/drivers/tty/Kconfig b/drivers/tty/Kconfig
index 82c4d2e45319b2ad27092469cd437d587d327560..864cceea46ad6cd76e7bc756577c881b00cf4698 100644 (file)
--- a/drivers/tty/Kconfig
+++ b/drivers/tty/Kconfig
@@ -466,4 +466,27 @@ config MIPS_EJTAG_FDC_KGDB_CHAN
        help
          FDC channel number to use for KGDB.
 
+config LDISC_AUTOLOAD
+       bool "Automatically load TTY Line Disciplines"
+       default y
+       help
+         Historically the kernel has always automatically loaded any
+         line discipline that is in a kernel module when a user asks
+         for it to be loaded with the TIOCSETD ioctl, or through other
+         means.  This is not always the best thing to do on systems
+         where you know you will not be using some of the more
+         "ancient" line disciplines, so prevent the kernel from doing
+         this unless the request is coming from a process with the
+         CAP_SYS_MODULE permissions.
+
+         Say 'Y' here if you trust your userspace users to do the right
+         thing, or if you have only provided the line disciplines that
+         you know you will be using, or if you wish to continue to use
+         the traditional method of on-demand loading of these modules
+         by any user.
+
+         This functionality can be changed at runtime with the
+         dev.tty.ldisc_autoload sysctl, this configuration option will
+         only set the default value of this functionality.
+
 endif # TTY

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 5b86ebc76a8a232716cda1466e1c5483e6962a43..b7effcfee91d81e18deb3c0c79df95a4c0aa0989 100644 (file)
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -513,6 +513,8 @@ void proc_clear_tty(struct task_struct *p)
        tty_kref_put(tty);
 }
 
+extern void tty_sysctl_init(void);
+
 /**
  * proc_set_tty -  set the controlling terminal
  *
@@ -3689,6 +3691,7 @@ 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)

diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index d9e013dc2c08acb42c5ea2d95f9e19537a51977b..02ab7e2d4494e627a6c40816ea3944cd95db5a37 100644 (file)
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -148,6 +148,13 @@ static void put_ldops(struct tty_ldisc_ops *ldops)
  *             takes tty_ldiscs_lock to guard against ldisc races
  */
 
+#if defined(CONFIG_LDISC_AUTOLOAD)
+       #define INITIAL_AUTOLOAD_STATE  1
+#else
+       #define INITIAL_AUTOLOAD_STATE  0
+#endif
+static int tty_ldisc_autoload = INITIAL_AUTOLOAD_STATE;
+
 static struct tty_ldisc *tty_ldisc_get(struct tty_struct *tty, int disc)
 {
        struct tty_ldisc *ld;
@@ -162,6 +169,8 @@ static struct tty_ldisc *tty_ldisc_get(struct tty_struct *tty, int disc)
         */
        ldops = get_ldops(disc);
        if (IS_ERR(ldops)) {
+               if (!capable(CAP_SYS_MODULE) && !tty_ldisc_autoload)
+                       return ERR_PTR(-EPERM);
                request_module("tty-ldisc-%d", disc);
                ldops = get_ldops(disc);
                if (IS_ERR(ldops))
@@ -830,3 +839,41 @@ void tty_ldisc_begin(void)
        /* Setup the default TTY line discipline. */
        (void) tty_register_ldisc(N_TTY, &tty_ldisc_N_TTY);
 }
+
+static int zero;
+static int one = 1;
+static struct ctl_table tty_table[] = {
+       {
+               .procname       = "ldisc_autoload",
+               .data           = &tty_ldisc_autoload,
+               .maxlen         = sizeof(tty_ldisc_autoload),
+               .mode           = 0644,
+               .proc_handler   = proc_dointvec,
+               .extra1         = &zero,
+               .extra2         = &one,
+       },
+       { }
+};
+
+static struct ctl_table tty_dir_table[] = {
+       {
+               .procname       = "tty",
+               .mode           = 0555,
+               .child          = tty_table,
+       },
+       { }
+};
+
+static struct ctl_table tty_root_table[] = {
+       {
+               .procname       = "dev",
+               .mode           = 0555,
+               .child          = tty_dir_table,
+       },
+       { }
+};
+
+void tty_sysctl_init(void)
+{
+       register_sysctl_table(tty_root_table);
+}