2017-11-07 01:11:51 +08:00
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// SPDX-License-Identifier: GPL-2.0
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2008-07-22 18:16:55 +08:00
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#include <linux/types.h>
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#include <linux/errno.h>
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2011-11-16 23:27:10 +08:00
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#include <linux/kmod.h>
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2008-07-22 18:16:55 +08:00
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/file.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/proc_fs.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/wait.h>
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#include <linux/bitops.h>
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#include <linux/seq_file.h>
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#include <linux/uaccess.h>
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2011-11-16 23:27:09 +08:00
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#include <linux/ratelimit.h>
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2008-07-22 18:16:55 +08:00
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2013-03-12 04:44:38 +08:00
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#undef LDISC_DEBUG_HANGUP
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#ifdef LDISC_DEBUG_HANGUP
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2015-07-13 10:49:10 +08:00
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#define tty_ldisc_debug(tty, f, args...) tty_debug(tty, f, ##args)
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2013-03-12 04:44:38 +08:00
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#else
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#define tty_ldisc_debug(tty, f, args...)
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#endif
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2013-06-15 19:04:47 +08:00
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/* lockdep nested classes for tty->ldisc_sem */
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enum {
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LDISC_SEM_NORMAL,
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LDISC_SEM_OTHER,
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};
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2008-07-22 18:16:55 +08:00
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/*
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* This guards the refcounted line discipline lists. The lock
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* must be taken with irqs off because there are hangup path
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* callers who will do ldisc lookups and cannot sleep.
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*/
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2013-06-15 19:04:46 +08:00
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static DEFINE_RAW_SPINLOCK(tty_ldiscs_lock);
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2008-07-22 18:16:55 +08:00
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/* Line disc dispatch table */
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static struct tty_ldisc_ops *tty_ldiscs[NR_LDISCS];
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/**
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* tty_register_ldisc - install a line discipline
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* @disc: ldisc number
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* @new_ldisc: pointer to the ldisc object
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*
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* Installs a new line discipline into the kernel. The discipline
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* is set up as unreferenced and then made available to the kernel
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* from this point onwards.
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*
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* Locking:
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2013-06-15 19:04:46 +08:00
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* takes tty_ldiscs_lock to guard against ldisc races
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2008-07-22 18:16:55 +08:00
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*/
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int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc)
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{
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unsigned long flags;
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int ret = 0;
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if (disc < N_TTY || disc >= NR_LDISCS)
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return -EINVAL;
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2013-06-15 19:04:46 +08:00
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raw_spin_lock_irqsave(&tty_ldiscs_lock, flags);
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2008-07-22 18:16:55 +08:00
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tty_ldiscs[disc] = new_ldisc;
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new_ldisc->num = disc;
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new_ldisc->refcount = 0;
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2013-06-15 19:04:46 +08:00
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raw_spin_unlock_irqrestore(&tty_ldiscs_lock, flags);
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2008-07-22 18:16:55 +08:00
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return ret;
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}
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EXPORT_SYMBOL(tty_register_ldisc);
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/**
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* tty_unregister_ldisc - unload a line discipline
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* @disc: ldisc number
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*
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* Remove a line discipline from the kernel providing it is not
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* currently in use.
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*
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* Locking:
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2013-06-15 19:04:46 +08:00
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* takes tty_ldiscs_lock to guard against ldisc races
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2008-07-22 18:16:55 +08:00
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*/
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int tty_unregister_ldisc(int disc)
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{
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unsigned long flags;
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int ret = 0;
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if (disc < N_TTY || disc >= NR_LDISCS)
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return -EINVAL;
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2013-06-15 19:04:46 +08:00
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raw_spin_lock_irqsave(&tty_ldiscs_lock, flags);
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2008-07-22 18:16:55 +08:00
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if (tty_ldiscs[disc]->refcount)
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ret = -EBUSY;
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else
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tty_ldiscs[disc] = NULL;
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2013-06-15 19:04:46 +08:00
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raw_spin_unlock_irqrestore(&tty_ldiscs_lock, flags);
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2008-07-22 18:16:55 +08:00
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return ret;
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}
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EXPORT_SYMBOL(tty_unregister_ldisc);
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2009-08-04 07:00:15 +08:00
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static struct tty_ldisc_ops *get_ldops(int disc)
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{
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unsigned long flags;
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struct tty_ldisc_ops *ldops, *ret;
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2013-06-15 19:04:46 +08:00
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raw_spin_lock_irqsave(&tty_ldiscs_lock, flags);
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2009-08-04 07:00:15 +08:00
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ret = ERR_PTR(-EINVAL);
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ldops = tty_ldiscs[disc];
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if (ldops) {
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ret = ERR_PTR(-EAGAIN);
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if (try_module_get(ldops->owner)) {
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ldops->refcount++;
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ret = ldops;
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}
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}
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2013-06-15 19:04:46 +08:00
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raw_spin_unlock_irqrestore(&tty_ldiscs_lock, flags);
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2009-08-04 07:00:15 +08:00
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return ret;
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}
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static void put_ldops(struct tty_ldisc_ops *ldops)
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{
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unsigned long flags;
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2013-06-15 19:04:46 +08:00
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raw_spin_lock_irqsave(&tty_ldiscs_lock, flags);
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2009-08-04 07:00:15 +08:00
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ldops->refcount--;
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module_put(ldops->owner);
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2013-06-15 19:04:46 +08:00
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raw_spin_unlock_irqrestore(&tty_ldiscs_lock, flags);
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2009-08-04 07:00:15 +08:00
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}
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2008-07-22 18:16:55 +08:00
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2020-11-12 18:58:54 +08:00
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static int tty_ldisc_autoload = IS_BUILTIN(CONFIG_LDISC_AUTOLOAD);
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2008-07-22 18:16:55 +08:00
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/**
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* tty_ldisc_get - take a reference to an ldisc
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2020-11-05 03:35:42 +08:00
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* @tty: tty device
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2008-07-22 18:16:55 +08:00
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* @disc: ldisc number
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*
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* Takes a reference to a line discipline. Deals with refcounts and
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2016-01-11 14:40:59 +08:00
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* module locking counts.
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*
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* Returns: -EINVAL if the discipline index is not [N_TTY..NR_LDISCS] or
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* if the discipline is not registered
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* -EAGAIN if request_module() failed to load or register the
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* the discipline
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* -ENOMEM if allocation failure
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*
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* Otherwise, returns a pointer to the discipline and bumps the
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* ref count
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2008-07-22 18:16:55 +08:00
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*
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* Locking:
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2013-06-15 19:04:46 +08:00
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* takes tty_ldiscs_lock to guard against ldisc races
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2008-07-22 18:16:55 +08:00
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*/
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2013-06-15 19:04:48 +08:00
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static struct tty_ldisc *tty_ldisc_get(struct tty_struct *tty, int disc)
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2008-07-22 18:16:55 +08:00
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{
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2009-06-11 19:50:12 +08:00
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struct tty_ldisc *ld;
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2009-08-04 07:01:28 +08:00
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struct tty_ldisc_ops *ldops;
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2008-07-22 18:16:55 +08:00
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if (disc < N_TTY || disc >= NR_LDISCS)
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2009-06-11 19:50:12 +08:00
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return ERR_PTR(-EINVAL);
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2009-08-04 07:01:28 +08:00
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/*
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* Get the ldisc ops - we may need to request them to be loaded
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* dynamically and try again.
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*/
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ldops = get_ldops(disc);
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if (IS_ERR(ldops)) {
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2019-01-22 00:26:42 +08:00
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if (!capable(CAP_SYS_MODULE) && !tty_ldisc_autoload)
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return ERR_PTR(-EPERM);
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2008-07-22 18:16:55 +08:00
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request_module("tty-ldisc-%d", disc);
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2009-08-04 07:01:28 +08:00
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ldops = get_ldops(disc);
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if (IS_ERR(ldops))
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return ERR_CAST(ldops);
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}
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2018-04-25 19:12:31 +08:00
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/*
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* There is no way to handle allocation failure of only 16 bytes.
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* Let's simplify error handling and save more memory.
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*/
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ld = kmalloc(sizeof(struct tty_ldisc), GFP_KERNEL | __GFP_NOFAIL);
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2009-08-04 07:01:28 +08:00
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ld->ops = ldops;
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2013-06-15 19:04:48 +08:00
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ld->tty = tty;
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2012-05-03 20:37:43 +08:00
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2009-06-11 19:50:12 +08:00
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return ld;
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2008-07-22 18:16:55 +08:00
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}
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2020-11-12 18:58:54 +08:00
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/*
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2013-03-12 04:44:43 +08:00
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* tty_ldisc_put - release the ldisc
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*
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* Complement of tty_ldisc_get().
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*/
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2015-10-28 00:40:02 +08:00
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static void tty_ldisc_put(struct tty_ldisc *ld)
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2013-03-12 04:44:43 +08:00
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{
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if (WARN_ON_ONCE(!ld))
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return;
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2013-06-15 19:04:48 +08:00
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put_ldops(ld->ops);
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2013-03-12 04:44:43 +08:00
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kfree(ld);
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}
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2009-06-11 19:51:41 +08:00
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static void *tty_ldiscs_seq_start(struct seq_file *m, loff_t *pos)
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2008-07-22 18:16:55 +08:00
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{
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return (*pos < NR_LDISCS) ? pos : NULL;
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}
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2009-06-11 19:51:41 +08:00
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static void *tty_ldiscs_seq_next(struct seq_file *m, void *v, loff_t *pos)
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2008-07-22 18:16:55 +08:00
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{
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(*pos)++;
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return (*pos < NR_LDISCS) ? pos : NULL;
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}
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static void tty_ldiscs_seq_stop(struct seq_file *m, void *v)
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{
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}
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static int tty_ldiscs_seq_show(struct seq_file *m, void *v)
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{
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int i = *(loff_t *)v;
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2009-08-04 07:00:15 +08:00
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struct tty_ldisc_ops *ldops;
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2009-06-11 19:51:41 +08:00
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2009-08-04 07:00:15 +08:00
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ldops = get_ldops(i);
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if (IS_ERR(ldops))
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2008-07-22 18:16:55 +08:00
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return 0;
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2009-08-04 07:00:15 +08:00
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seq_printf(m, "%-10s %2d\n", ldops->name ? ldops->name : "???", i);
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put_ldops(ldops);
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2008-07-22 18:16:55 +08:00
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return 0;
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}
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2018-04-14 01:44:18 +08:00
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const struct seq_operations tty_ldiscs_seq_ops = {
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2008-07-22 18:16:55 +08:00
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.start = tty_ldiscs_seq_start,
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.next = tty_ldiscs_seq_next,
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.stop = tty_ldiscs_seq_stop,
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.show = tty_ldiscs_seq_show,
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};
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/**
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* tty_ldisc_ref_wait - wait for the tty ldisc
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* @tty: tty device
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*
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* Dereference the line discipline for the terminal and take a
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* reference to it. If the line discipline is in flux then
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* wait patiently until it changes.
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*
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tty: Destroy ldisc instance on hangup
Currently, when the tty is hungup, the ldisc is re-instanced; ie., the
current instance is destroyed and a new instance is created. The purpose
of this design was to guarantee a valid, open ldisc for the lifetime of
the tty.
However, now that tty buffers are owned by and have lifetime equivalent
to the tty_port (since v3.10), any data received immediately after the
ldisc is re-instanced may cause continued driver i/o operations
concurrently with the driver's hangup() operation. For drivers that
shutdown h/w on hangup, this is unexpected and usually bad. For example,
the serial core may free the xmit buffer page concurrently with an
in-progress write() operation (triggered by echo).
With the existing stable and robust ldisc reference handling, the
cleaned-up tty_reopen(), the straggling unsafe ldisc use cleaned up, and
the preparation to properly handle a NULL tty->ldisc, the ldisc instance
can be destroyed and only re-instanced when the tty is re-opened.
If the tty was opened as /dev/console or /dev/tty0, the original behavior
of re-instancing the ldisc is retained (the 'reinit' parameter to
tty_ldisc_hangup() is true). This is required since those file descriptors
are never hungup.
This patch has neglible impact on userspace; the tty file_operations ptr
is changed to point to the hungup file operations _before_ the ldisc
instance is destroyed, so only racing file operations might now retrieve
a NULL ldisc reference (which is simply handled as if the hungup file
operation had been called instead -- see "tty: Prepare for destroying
line discipline on hangup").
This resolves a long-standing FIXME and several crash reports.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-01-11 14:41:06 +08:00
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* Returns: NULL if the tty has been hungup and not re-opened with
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* a new file descriptor, otherwise valid ldisc reference
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*
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2020-11-12 18:58:54 +08:00
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* Note 1: Must not be called from an IRQ/timer context. The caller
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2008-07-22 18:16:55 +08:00
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* must also be careful not to hold other locks that will deadlock
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* against a discipline change, such as an existing ldisc reference
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* (which we check for)
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*
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2020-11-12 18:58:54 +08:00
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* Note 2: a file_operations routine (read/poll/write) should use this
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2016-01-11 14:41:01 +08:00
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* function to wait for any ldisc lifetime events to finish.
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2008-07-22 18:16:55 +08:00
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*/
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struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *tty)
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{
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2017-03-04 20:46:12 +08:00
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struct tty_ldisc *ld;
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2013-06-15 19:04:48 +08:00
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ldsem_down_read(&tty->ldisc_sem, MAX_SCHEDULE_TIMEOUT);
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2017-03-04 20:46:12 +08:00
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ld = tty->ldisc;
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if (!ld)
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2016-01-11 14:41:02 +08:00
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ldsem_up_read(&tty->ldisc_sem);
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2017-03-04 20:46:12 +08:00
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return ld;
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2008-07-22 18:16:55 +08:00
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}
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EXPORT_SYMBOL_GPL(tty_ldisc_ref_wait);
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/**
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* tty_ldisc_ref - get the tty ldisc
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* @tty: tty device
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*
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* Dereference the line discipline for the terminal and take a
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* reference to it. If the line discipline is in flux then
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* return NULL. Can be called from IRQ and timer functions.
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*/
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struct tty_ldisc *tty_ldisc_ref(struct tty_struct *tty)
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{
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2013-06-15 19:04:48 +08:00
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struct tty_ldisc *ld = NULL;
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if (ldsem_down_read_trylock(&tty->ldisc_sem)) {
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ld = tty->ldisc;
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if (!ld)
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|
|
ldsem_up_read(&tty->ldisc_sem);
|
|
|
|
}
|
|
|
|
return ld;
|
2008-07-22 18:16:55 +08:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(tty_ldisc_ref);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* tty_ldisc_deref - free a tty ldisc reference
|
|
|
|
* @ld: reference to free up
|
|
|
|
*
|
|
|
|
* Undoes the effect of tty_ldisc_ref or tty_ldisc_ref_wait. May
|
|
|
|
* be called in IRQ context.
|
|
|
|
*/
|
|
|
|
|
|
|
|
void tty_ldisc_deref(struct tty_ldisc *ld)
|
|
|
|
{
|
2013-06-15 19:04:48 +08:00
|
|
|
ldsem_up_read(&ld->tty->ldisc_sem);
|
2008-07-22 18:16:55 +08:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(tty_ldisc_deref);
|
|
|
|
|
2013-06-15 19:04:47 +08:00
|
|
|
|
2016-01-10 13:13:51 +08:00
|
|
|
static inline int
|
2014-11-06 01:13:06 +08:00
|
|
|
__tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout)
|
2013-06-15 19:04:47 +08:00
|
|
|
{
|
|
|
|
return ldsem_down_write(&tty->ldisc_sem, timeout);
|
|
|
|
}
|
|
|
|
|
2016-01-10 13:13:51 +08:00
|
|
|
static inline int
|
2014-11-06 01:13:06 +08:00
|
|
|
__tty_ldisc_lock_nested(struct tty_struct *tty, unsigned long timeout)
|
2013-06-15 19:04:47 +08:00
|
|
|
{
|
|
|
|
return ldsem_down_write_nested(&tty->ldisc_sem,
|
|
|
|
LDISC_SEM_OTHER, timeout);
|
|
|
|
}
|
|
|
|
|
2014-11-06 01:13:06 +08:00
|
|
|
static inline void __tty_ldisc_unlock(struct tty_struct *tty)
|
2013-06-15 19:04:47 +08:00
|
|
|
{
|
2015-10-05 03:19:18 +08:00
|
|
|
ldsem_up_write(&tty->ldisc_sem);
|
2013-06-15 19:04:47 +08:00
|
|
|
}
|
|
|
|
|
2018-01-23 15:46:34 +08:00
|
|
|
int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout)
|
2014-11-06 01:13:07 +08:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2018-11-01 08:24:48 +08:00
|
|
|
/* Kindly asking blocked readers to release the read side */
|
|
|
|
set_bit(TTY_LDISC_CHANGING, &tty->flags);
|
|
|
|
wake_up_interruptible_all(&tty->read_wait);
|
|
|
|
wake_up_interruptible_all(&tty->write_wait);
|
|
|
|
|
2014-11-06 01:13:07 +08:00
|
|
|
ret = __tty_ldisc_lock(tty, timeout);
|
|
|
|
if (!ret)
|
|
|
|
return -EBUSY;
|
|
|
|
set_bit(TTY_LDISC_HALTED, &tty->flags);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2018-01-23 15:46:34 +08:00
|
|
|
void tty_ldisc_unlock(struct tty_struct *tty)
|
2014-11-06 01:13:07 +08:00
|
|
|
{
|
|
|
|
clear_bit(TTY_LDISC_HALTED, &tty->flags);
|
2018-11-01 08:24:48 +08:00
|
|
|
/* Can be cleared here - ldisc_unlock will wake up writers firstly */
|
|
|
|
clear_bit(TTY_LDISC_CHANGING, &tty->flags);
|
2014-11-06 01:13:07 +08:00
|
|
|
__tty_ldisc_unlock(tty);
|
|
|
|
}
|
|
|
|
|
2016-01-10 13:13:51 +08:00
|
|
|
static int
|
2013-06-15 19:04:47 +08:00
|
|
|
tty_ldisc_lock_pair_timeout(struct tty_struct *tty, struct tty_struct *tty2,
|
|
|
|
unsigned long timeout)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (tty < tty2) {
|
2014-11-06 01:13:06 +08:00
|
|
|
ret = __tty_ldisc_lock(tty, timeout);
|
2013-06-15 19:04:47 +08:00
|
|
|
if (ret) {
|
2014-11-06 01:13:06 +08:00
|
|
|
ret = __tty_ldisc_lock_nested(tty2, timeout);
|
2013-06-15 19:04:47 +08:00
|
|
|
if (!ret)
|
2014-11-06 01:13:06 +08:00
|
|
|
__tty_ldisc_unlock(tty);
|
2013-06-15 19:04:47 +08:00
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* if this is possible, it has lots of implications */
|
|
|
|
WARN_ON_ONCE(tty == tty2);
|
|
|
|
if (tty2 && tty != tty2) {
|
2014-11-06 01:13:06 +08:00
|
|
|
ret = __tty_ldisc_lock(tty2, timeout);
|
2013-06-15 19:04:47 +08:00
|
|
|
if (ret) {
|
2014-11-06 01:13:06 +08:00
|
|
|
ret = __tty_ldisc_lock_nested(tty, timeout);
|
2013-06-15 19:04:47 +08:00
|
|
|
if (!ret)
|
2014-11-06 01:13:06 +08:00
|
|
|
__tty_ldisc_unlock(tty2);
|
2013-06-15 19:04:47 +08:00
|
|
|
}
|
|
|
|
} else
|
2014-11-06 01:13:06 +08:00
|
|
|
ret = __tty_ldisc_lock(tty, timeout);
|
2013-06-15 19:04:47 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
if (!ret)
|
|
|
|
return -EBUSY;
|
|
|
|
|
|
|
|
set_bit(TTY_LDISC_HALTED, &tty->flags);
|
|
|
|
if (tty2)
|
|
|
|
set_bit(TTY_LDISC_HALTED, &tty2->flags);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2016-01-10 13:13:51 +08:00
|
|
|
static void tty_ldisc_lock_pair(struct tty_struct *tty, struct tty_struct *tty2)
|
2013-06-15 19:04:47 +08:00
|
|
|
{
|
|
|
|
tty_ldisc_lock_pair_timeout(tty, tty2, MAX_SCHEDULE_TIMEOUT);
|
|
|
|
}
|
|
|
|
|
2016-01-10 13:13:51 +08:00
|
|
|
static void tty_ldisc_unlock_pair(struct tty_struct *tty,
|
|
|
|
struct tty_struct *tty2)
|
2013-06-15 19:04:47 +08:00
|
|
|
{
|
2014-11-06 01:13:06 +08:00
|
|
|
__tty_ldisc_unlock(tty);
|
2013-06-15 19:04:47 +08:00
|
|
|
if (tty2)
|
2014-11-06 01:13:06 +08:00
|
|
|
__tty_ldisc_unlock(tty2);
|
2013-06-15 19:04:47 +08:00
|
|
|
}
|
|
|
|
|
2009-06-11 19:50:58 +08:00
|
|
|
/**
|
|
|
|
* tty_ldisc_flush - flush line discipline queue
|
|
|
|
* @tty: tty
|
|
|
|
*
|
2014-11-06 01:13:09 +08:00
|
|
|
* Flush the line discipline queue (if any) and the tty flip buffers
|
|
|
|
* for this tty.
|
2009-06-11 19:50:58 +08:00
|
|
|
*/
|
|
|
|
|
|
|
|
void tty_ldisc_flush(struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
struct tty_ldisc *ld = tty_ldisc_ref(tty);
|
2014-11-06 01:13:09 +08:00
|
|
|
|
|
|
|
tty_buffer_flush(tty, ld);
|
|
|
|
if (ld)
|
2009-06-11 19:50:58 +08:00
|
|
|
tty_ldisc_deref(ld);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(tty_ldisc_flush);
|
|
|
|
|
2008-07-22 18:16:55 +08:00
|
|
|
/**
|
|
|
|
* tty_set_termios_ldisc - set ldisc field
|
|
|
|
* @tty: tty structure
|
2016-01-11 14:41:04 +08:00
|
|
|
* @disc: line discipline number
|
2008-07-22 18:16:55 +08:00
|
|
|
*
|
|
|
|
* This is probably overkill for real world processors but
|
|
|
|
* they are not on hot paths so a little discipline won't do
|
|
|
|
* any harm.
|
|
|
|
*
|
2015-11-28 03:30:21 +08:00
|
|
|
* The line discipline-related tty_struct fields are reset to
|
|
|
|
* prevent the ldisc driver from re-using stale information for
|
|
|
|
* the new ldisc instance.
|
|
|
|
*
|
2013-06-15 21:14:23 +08:00
|
|
|
* Locking: takes termios_rwsem
|
2008-07-22 18:16:55 +08:00
|
|
|
*/
|
|
|
|
|
2016-01-11 14:41:04 +08:00
|
|
|
static void tty_set_termios_ldisc(struct tty_struct *tty, int disc)
|
2008-07-22 18:16:55 +08:00
|
|
|
{
|
2013-06-15 21:14:23 +08:00
|
|
|
down_write(&tty->termios_rwsem);
|
2016-01-11 14:41:04 +08:00
|
|
|
tty->termios.c_line = disc;
|
2013-06-15 21:14:23 +08:00
|
|
|
up_write(&tty->termios_rwsem);
|
2015-11-28 03:30:21 +08:00
|
|
|
|
|
|
|
tty->disc_data = NULL;
|
|
|
|
tty->receive_room = 0;
|
2008-07-22 18:16:55 +08:00
|
|
|
}
|
|
|
|
|
2009-06-11 19:50:12 +08:00
|
|
|
/**
|
|
|
|
* tty_ldisc_open - open a line discipline
|
|
|
|
* @tty: tty we are opening the ldisc on
|
|
|
|
* @ld: discipline to open
|
|
|
|
*
|
|
|
|
* A helper opening method. Also a convenient debugging and check
|
|
|
|
* point.
|
2010-06-02 04:53:01 +08:00
|
|
|
*
|
|
|
|
* Locking: always called with BTM already held.
|
2009-06-11 19:50:12 +08:00
|
|
|
*/
|
|
|
|
|
|
|
|
static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld)
|
|
|
|
{
|
|
|
|
WARN_ON(test_and_set_bit(TTY_LDISC_OPEN, &tty->flags));
|
2009-11-30 21:18:35 +08:00
|
|
|
if (ld->ops->open) {
|
|
|
|
int ret;
|
2021-04-07 15:06:46 +08:00
|
|
|
/* BTM here locks versus a hangup event */
|
2009-11-30 21:18:35 +08:00
|
|
|
ret = ld->ops->open(tty);
|
2010-11-25 07:27:54 +08:00
|
|
|
if (ret)
|
|
|
|
clear_bit(TTY_LDISC_OPEN, &tty->flags);
|
2015-07-13 10:49:12 +08:00
|
|
|
|
2016-01-11 14:41:02 +08:00
|
|
|
tty_ldisc_debug(tty, "%p: opened\n", ld);
|
2009-11-30 21:18:35 +08:00
|
|
|
return ret;
|
|
|
|
}
|
2009-06-11 19:50:12 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* tty_ldisc_close - close a line discipline
|
|
|
|
* @tty: tty we are opening the ldisc on
|
|
|
|
* @ld: discipline to close
|
|
|
|
*
|
|
|
|
* A helper close method. Also a convenient debugging and check
|
|
|
|
* point.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static void tty_ldisc_close(struct tty_struct *tty, struct tty_ldisc *ld)
|
|
|
|
{
|
2019-05-31 18:06:51 +08:00
|
|
|
lockdep_assert_held_write(&tty->ldisc_sem);
|
2009-06-11 19:50:12 +08:00
|
|
|
WARN_ON(!test_bit(TTY_LDISC_OPEN, &tty->flags));
|
|
|
|
clear_bit(TTY_LDISC_OPEN, &tty->flags);
|
|
|
|
if (ld->ops->close)
|
|
|
|
ld->ops->close(tty);
|
2016-01-11 14:41:02 +08:00
|
|
|
tty_ldisc_debug(tty, "%p: closed\n", ld);
|
2009-06-11 19:50:12 +08:00
|
|
|
}
|
2008-07-22 18:16:55 +08:00
|
|
|
|
2017-06-02 20:49:30 +08:00
|
|
|
/**
|
|
|
|
* tty_ldisc_failto - helper for ldisc failback
|
|
|
|
* @tty: tty to open the ldisc on
|
|
|
|
* @ld: ldisc we are trying to fail back to
|
|
|
|
*
|
|
|
|
* Helper to try and recover a tty when switching back to the old
|
|
|
|
* ldisc fails and we need something attached.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static int tty_ldisc_failto(struct tty_struct *tty, int ld)
|
|
|
|
{
|
|
|
|
struct tty_ldisc *disc = tty_ldisc_get(tty, ld);
|
|
|
|
int r;
|
|
|
|
|
2019-05-31 18:06:51 +08:00
|
|
|
lockdep_assert_held_write(&tty->ldisc_sem);
|
2017-06-02 20:49:30 +08:00
|
|
|
if (IS_ERR(disc))
|
|
|
|
return PTR_ERR(disc);
|
|
|
|
tty->ldisc = disc;
|
|
|
|
tty_set_termios_ldisc(tty, ld);
|
2021-04-07 15:06:49 +08:00
|
|
|
r = tty_ldisc_open(tty, disc);
|
|
|
|
if (r < 0)
|
2017-06-02 20:49:30 +08:00
|
|
|
tty_ldisc_put(disc);
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
2017-04-14 16:57:52 +08:00
|
|
|
/**
|
|
|
|
* tty_ldisc_restore - helper for tty ldisc change
|
|
|
|
* @tty: tty to recover
|
|
|
|
* @old: previous ldisc
|
|
|
|
*
|
|
|
|
* Restore the previous line discipline or N_TTY when a line discipline
|
|
|
|
* change fails due to an open error
|
|
|
|
*/
|
|
|
|
|
|
|
|
static void tty_ldisc_restore(struct tty_struct *tty, struct tty_ldisc *old)
|
|
|
|
{
|
|
|
|
/* There is an outstanding reference here so this is safe */
|
2018-04-16 19:06:34 +08:00
|
|
|
if (tty_ldisc_failto(tty, old->ops->num) < 0) {
|
|
|
|
const char *name = tty_name(tty);
|
|
|
|
|
|
|
|
pr_warn("Falling back ldisc for %s.\n", name);
|
2021-04-07 15:06:48 +08:00
|
|
|
/*
|
|
|
|
* The traditional behaviour is to fall back to N_TTY, we
|
|
|
|
* want to avoid falling back to N_NULL unless we have no
|
|
|
|
* choice to avoid the risk of breaking anything
|
|
|
|
*/
|
2017-06-02 20:49:30 +08:00
|
|
|
if (tty_ldisc_failto(tty, N_TTY) < 0 &&
|
|
|
|
tty_ldisc_failto(tty, N_NULL) < 0)
|
2018-04-16 19:06:34 +08:00
|
|
|
panic("Couldn't open N_NULL ldisc for %s.", name);
|
2017-04-14 16:57:52 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-07-22 18:16:55 +08:00
|
|
|
/**
|
|
|
|
* tty_set_ldisc - set line discipline
|
|
|
|
* @tty: the terminal to set
|
2020-08-18 16:56:51 +08:00
|
|
|
* @disc: the line discipline number
|
2008-07-22 18:16:55 +08:00
|
|
|
*
|
|
|
|
* Set the discipline of a tty line. Must be called from a process
|
2009-06-11 19:50:12 +08:00
|
|
|
* context. The ldisc change logic has to protect itself against any
|
|
|
|
* overlapping ldisc change (including on the other end of pty pairs),
|
|
|
|
* the close of one side of a tty/pty pair, and eventually hangup.
|
2008-07-22 18:16:55 +08:00
|
|
|
*/
|
|
|
|
|
2016-01-11 14:41:04 +08:00
|
|
|
int tty_set_ldisc(struct tty_struct *tty, int disc)
|
2008-07-22 18:16:55 +08:00
|
|
|
{
|
2017-04-14 16:57:52 +08:00
|
|
|
int retval;
|
|
|
|
struct tty_ldisc *old_ldisc, *new_ldisc;
|
|
|
|
|
|
|
|
new_ldisc = tty_ldisc_get(tty, disc);
|
|
|
|
if (IS_ERR(new_ldisc))
|
|
|
|
return PTR_ERR(new_ldisc);
|
2008-07-22 18:16:55 +08:00
|
|
|
|
2014-11-06 01:12:45 +08:00
|
|
|
tty_lock(tty);
|
2014-11-06 01:13:08 +08:00
|
|
|
retval = tty_ldisc_lock(tty, 5 * HZ);
|
2015-11-08 22:29:38 +08:00
|
|
|
if (retval)
|
|
|
|
goto err;
|
2008-07-22 18:16:55 +08:00
|
|
|
|
2016-01-11 14:41:02 +08:00
|
|
|
if (!tty->ldisc) {
|
|
|
|
retval = -EIO;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2015-11-08 22:29:38 +08:00
|
|
|
/* Check the no-op case */
|
2017-04-14 16:57:52 +08:00
|
|
|
if (tty->ldisc->ops->num == disc)
|
2015-11-08 22:29:38 +08:00
|
|
|
goto out;
|
2009-06-11 19:50:12 +08:00
|
|
|
|
2015-11-08 22:29:38 +08:00
|
|
|
if (test_bit(TTY_HUPPED, &tty->flags)) {
|
|
|
|
/* We were raced by hangup */
|
|
|
|
retval = -EIO;
|
|
|
|
goto out;
|
2008-07-22 18:16:55 +08:00
|
|
|
}
|
|
|
|
|
2017-04-14 16:57:52 +08:00
|
|
|
old_ldisc = tty->ldisc;
|
|
|
|
|
|
|
|
/* Shutdown the old discipline. */
|
|
|
|
tty_ldisc_close(tty, old_ldisc);
|
|
|
|
|
|
|
|
/* Now set up the new line discipline. */
|
|
|
|
tty->ldisc = new_ldisc;
|
|
|
|
tty_set_termios_ldisc(tty, disc);
|
|
|
|
|
|
|
|
retval = tty_ldisc_open(tty, new_ldisc);
|
2008-07-22 18:16:55 +08:00
|
|
|
if (retval < 0) {
|
2009-06-11 19:50:12 +08:00
|
|
|
/* Back to the old one or N_TTY if we can't */
|
2017-04-14 16:57:52 +08:00
|
|
|
tty_ldisc_put(new_ldisc);
|
|
|
|
tty_ldisc_restore(tty, old_ldisc);
|
2008-07-22 18:16:55 +08:00
|
|
|
}
|
2009-06-11 19:50:12 +08:00
|
|
|
|
2017-04-14 16:57:52 +08:00
|
|
|
if (tty->ldisc->ops->num != old_ldisc->ops->num && tty->ops->set_ldisc) {
|
2014-11-06 02:11:41 +08:00
|
|
|
down_read(&tty->termios_rwsem);
|
2008-07-22 18:16:55 +08:00
|
|
|
tty->ops->set_ldisc(tty);
|
2014-11-06 02:11:41 +08:00
|
|
|
up_read(&tty->termios_rwsem);
|
|
|
|
}
|
2008-07-22 18:16:55 +08:00
|
|
|
|
2021-04-07 15:06:48 +08:00
|
|
|
/*
|
|
|
|
* At this point we hold a reference to the new ldisc and a
|
|
|
|
* reference to the old ldisc, or we hold two references to
|
|
|
|
* the old ldisc (if it was restored as part of error cleanup
|
|
|
|
* above). In either case, releasing a single reference from
|
|
|
|
* the old ldisc is correct.
|
|
|
|
*/
|
2017-04-14 16:57:52 +08:00
|
|
|
new_ldisc = old_ldisc;
|
2015-11-08 22:29:38 +08:00
|
|
|
out:
|
2014-11-06 01:13:08 +08:00
|
|
|
tty_ldisc_unlock(tty);
|
2008-07-22 18:16:55 +08:00
|
|
|
|
2021-04-07 15:06:48 +08:00
|
|
|
/*
|
|
|
|
* Restart the work queue in case no characters kick it off. Safe if
|
|
|
|
* already running
|
|
|
|
*/
|
2015-11-08 20:53:06 +08:00
|
|
|
tty_buffer_restart_work(tty->port);
|
2015-11-08 22:29:38 +08:00
|
|
|
err:
|
2017-04-14 16:57:52 +08:00
|
|
|
tty_ldisc_put(new_ldisc); /* drop the extra reference */
|
2012-08-08 23:30:13 +08:00
|
|
|
tty_unlock(tty);
|
2008-07-22 18:16:55 +08:00
|
|
|
return retval;
|
|
|
|
}
|
2017-05-16 01:45:33 +08:00
|
|
|
EXPORT_SYMBOL_GPL(tty_set_ldisc);
|
2008-07-22 18:16:55 +08:00
|
|
|
|
2016-01-11 14:41:03 +08:00
|
|
|
/**
|
|
|
|
* tty_ldisc_kill - teardown ldisc
|
|
|
|
* @tty: tty being released
|
|
|
|
*
|
|
|
|
* Perform final close of the ldisc and reset tty->ldisc
|
|
|
|
*/
|
|
|
|
static void tty_ldisc_kill(struct tty_struct *tty)
|
|
|
|
{
|
2019-05-31 18:06:51 +08:00
|
|
|
lockdep_assert_held_write(&tty->ldisc_sem);
|
2016-01-11 14:41:03 +08:00
|
|
|
if (!tty->ldisc)
|
|
|
|
return;
|
|
|
|
/*
|
|
|
|
* Now kill off the ldisc
|
|
|
|
*/
|
|
|
|
tty_ldisc_close(tty, tty->ldisc);
|
|
|
|
tty_ldisc_put(tty->ldisc);
|
|
|
|
/* Force an oops if we mess this up */
|
|
|
|
tty->ldisc = NULL;
|
|
|
|
}
|
|
|
|
|
2009-06-11 19:50:12 +08:00
|
|
|
/**
|
|
|
|
* tty_reset_termios - reset terminal state
|
|
|
|
* @tty: tty to reset
|
|
|
|
*
|
|
|
|
* Restore a terminal to the driver default state.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static void tty_reset_termios(struct tty_struct *tty)
|
|
|
|
{
|
2013-06-15 21:14:23 +08:00
|
|
|
down_write(&tty->termios_rwsem);
|
2012-07-14 22:31:47 +08:00
|
|
|
tty->termios = tty->driver->init_termios;
|
|
|
|
tty->termios.c_ispeed = tty_termios_input_baud_rate(&tty->termios);
|
|
|
|
tty->termios.c_ospeed = tty_termios_baud_rate(&tty->termios);
|
2013-06-15 21:14:23 +08:00
|
|
|
up_write(&tty->termios_rwsem);
|
2009-06-11 19:50:12 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* tty_ldisc_reinit - reinitialise the tty ldisc
|
|
|
|
* @tty: tty to reinit
|
2016-01-11 14:41:04 +08:00
|
|
|
* @disc: line discipline to reinitialize
|
2009-06-11 19:50:12 +08:00
|
|
|
*
|
2016-01-11 14:41:05 +08:00
|
|
|
* Completely reinitialize the line discipline state, by closing the
|
tty: Destroy ldisc instance on hangup
Currently, when the tty is hungup, the ldisc is re-instanced; ie., the
current instance is destroyed and a new instance is created. The purpose
of this design was to guarantee a valid, open ldisc for the lifetime of
the tty.
However, now that tty buffers are owned by and have lifetime equivalent
to the tty_port (since v3.10), any data received immediately after the
ldisc is re-instanced may cause continued driver i/o operations
concurrently with the driver's hangup() operation. For drivers that
shutdown h/w on hangup, this is unexpected and usually bad. For example,
the serial core may free the xmit buffer page concurrently with an
in-progress write() operation (triggered by echo).
With the existing stable and robust ldisc reference handling, the
cleaned-up tty_reopen(), the straggling unsafe ldisc use cleaned up, and
the preparation to properly handle a NULL tty->ldisc, the ldisc instance
can be destroyed and only re-instanced when the tty is re-opened.
If the tty was opened as /dev/console or /dev/tty0, the original behavior
of re-instancing the ldisc is retained (the 'reinit' parameter to
tty_ldisc_hangup() is true). This is required since those file descriptors
are never hungup.
This patch has neglible impact on userspace; the tty file_operations ptr
is changed to point to the hungup file operations _before_ the ldisc
instance is destroyed, so only racing file operations might now retrieve
a NULL ldisc reference (which is simply handled as if the hungup file
operation had been called instead -- see "tty: Prepare for destroying
line discipline on hangup").
This resolves a long-standing FIXME and several crash reports.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-01-11 14:41:06 +08:00
|
|
|
* current instance, if there is one, and opening a new instance. If
|
|
|
|
* an error occurs opening the new non-N_TTY instance, the instance
|
|
|
|
* is dropped and tty->ldisc reset to NULL. The caller can then retry
|
|
|
|
* with N_TTY instead.
|
2016-01-11 14:41:05 +08:00
|
|
|
*
|
|
|
|
* Returns 0 if successful, otherwise error code < 0
|
2009-06-11 19:50:12 +08:00
|
|
|
*/
|
|
|
|
|
tty: Destroy ldisc instance on hangup
Currently, when the tty is hungup, the ldisc is re-instanced; ie., the
current instance is destroyed and a new instance is created. The purpose
of this design was to guarantee a valid, open ldisc for the lifetime of
the tty.
However, now that tty buffers are owned by and have lifetime equivalent
to the tty_port (since v3.10), any data received immediately after the
ldisc is re-instanced may cause continued driver i/o operations
concurrently with the driver's hangup() operation. For drivers that
shutdown h/w on hangup, this is unexpected and usually bad. For example,
the serial core may free the xmit buffer page concurrently with an
in-progress write() operation (triggered by echo).
With the existing stable and robust ldisc reference handling, the
cleaned-up tty_reopen(), the straggling unsafe ldisc use cleaned up, and
the preparation to properly handle a NULL tty->ldisc, the ldisc instance
can be destroyed and only re-instanced when the tty is re-opened.
If the tty was opened as /dev/console or /dev/tty0, the original behavior
of re-instancing the ldisc is retained (the 'reinit' parameter to
tty_ldisc_hangup() is true). This is required since those file descriptors
are never hungup.
This patch has neglible impact on userspace; the tty file_operations ptr
is changed to point to the hungup file operations _before_ the ldisc
instance is destroyed, so only racing file operations might now retrieve
a NULL ldisc reference (which is simply handled as if the hungup file
operation had been called instead -- see "tty: Prepare for destroying
line discipline on hangup").
This resolves a long-standing FIXME and several crash reports.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-01-11 14:41:06 +08:00
|
|
|
int tty_ldisc_reinit(struct tty_struct *tty, int disc)
|
2009-06-11 19:50:12 +08:00
|
|
|
{
|
2016-01-11 14:41:05 +08:00
|
|
|
struct tty_ldisc *ld;
|
|
|
|
int retval;
|
2010-10-27 23:13:21 +08:00
|
|
|
|
2019-05-31 18:06:51 +08:00
|
|
|
lockdep_assert_held_write(&tty->ldisc_sem);
|
2016-01-11 14:41:05 +08:00
|
|
|
ld = tty_ldisc_get(tty, disc);
|
2017-04-14 16:57:52 +08:00
|
|
|
if (IS_ERR(ld)) {
|
|
|
|
BUG_ON(disc == N_TTY);
|
2016-01-11 14:41:05 +08:00
|
|
|
return PTR_ERR(ld);
|
2017-04-14 16:57:52 +08:00
|
|
|
}
|
2009-06-11 19:50:12 +08:00
|
|
|
|
2016-01-11 14:41:05 +08:00
|
|
|
if (tty->ldisc) {
|
|
|
|
tty_ldisc_close(tty, tty->ldisc);
|
|
|
|
tty_ldisc_put(tty->ldisc);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* switch the line discipline */
|
2013-03-12 04:44:42 +08:00
|
|
|
tty->ldisc = ld;
|
2016-01-11 14:41:04 +08:00
|
|
|
tty_set_termios_ldisc(tty, disc);
|
2016-01-11 14:41:05 +08:00
|
|
|
retval = tty_ldisc_open(tty, tty->ldisc);
|
|
|
|
if (retval) {
|
2017-10-14 06:58:08 +08:00
|
|
|
tty_ldisc_put(tty->ldisc);
|
|
|
|
tty->ldisc = NULL;
|
2016-01-11 14:41:05 +08:00
|
|
|
}
|
|
|
|
return retval;
|
2009-06-11 19:50:12 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* tty_ldisc_hangup - hangup ldisc reset
|
|
|
|
* @tty: tty being hung up
|
2020-11-12 18:58:54 +08:00
|
|
|
* @reinit: whether to re-initialise the tty
|
2009-06-11 19:50:12 +08:00
|
|
|
*
|
|
|
|
* Some tty devices reset their termios when they receive a hangup
|
|
|
|
* event. In that situation we must also switch back to N_TTY properly
|
|
|
|
* before we reset the termios data.
|
|
|
|
*
|
|
|
|
* Locking: We can take the ldisc mutex as the rest of the code is
|
|
|
|
* careful to allow for this.
|
|
|
|
*
|
|
|
|
* In the pty pair case this occurs in the close() path of the
|
|
|
|
* tty itself so we must be careful about locking rules.
|
|
|
|
*/
|
|
|
|
|
tty: Destroy ldisc instance on hangup
Currently, when the tty is hungup, the ldisc is re-instanced; ie., the
current instance is destroyed and a new instance is created. The purpose
of this design was to guarantee a valid, open ldisc for the lifetime of
the tty.
However, now that tty buffers are owned by and have lifetime equivalent
to the tty_port (since v3.10), any data received immediately after the
ldisc is re-instanced may cause continued driver i/o operations
concurrently with the driver's hangup() operation. For drivers that
shutdown h/w on hangup, this is unexpected and usually bad. For example,
the serial core may free the xmit buffer page concurrently with an
in-progress write() operation (triggered by echo).
With the existing stable and robust ldisc reference handling, the
cleaned-up tty_reopen(), the straggling unsafe ldisc use cleaned up, and
the preparation to properly handle a NULL tty->ldisc, the ldisc instance
can be destroyed and only re-instanced when the tty is re-opened.
If the tty was opened as /dev/console or /dev/tty0, the original behavior
of re-instancing the ldisc is retained (the 'reinit' parameter to
tty_ldisc_hangup() is true). This is required since those file descriptors
are never hungup.
This patch has neglible impact on userspace; the tty file_operations ptr
is changed to point to the hungup file operations _before_ the ldisc
instance is destroyed, so only racing file operations might now retrieve
a NULL ldisc reference (which is simply handled as if the hungup file
operation had been called instead -- see "tty: Prepare for destroying
line discipline on hangup").
This resolves a long-standing FIXME and several crash reports.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-01-11 14:41:06 +08:00
|
|
|
void tty_ldisc_hangup(struct tty_struct *tty, bool reinit)
|
2009-06-11 19:50:12 +08:00
|
|
|
{
|
|
|
|
struct tty_ldisc *ld;
|
|
|
|
|
2016-01-11 14:41:02 +08:00
|
|
|
tty_ldisc_debug(tty, "%p: hangup\n", tty->ldisc);
|
2013-03-12 04:44:38 +08:00
|
|
|
|
2009-06-11 19:50:12 +08:00
|
|
|
ld = tty_ldisc_ref(tty);
|
|
|
|
if (ld != NULL) {
|
|
|
|
if (ld->ops->flush_buffer)
|
|
|
|
ld->ops->flush_buffer(tty);
|
|
|
|
tty_driver_flush_buffer(tty);
|
|
|
|
if ((test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags)) &&
|
|
|
|
ld->ops->write_wakeup)
|
|
|
|
ld->ops->write_wakeup(tty);
|
|
|
|
if (ld->ops->hangup)
|
|
|
|
ld->ops->hangup(tty);
|
|
|
|
tty_ldisc_deref(ld);
|
|
|
|
}
|
2013-06-15 19:04:48 +08:00
|
|
|
|
2018-02-12 06:34:03 +08:00
|
|
|
wake_up_interruptible_poll(&tty->write_wait, EPOLLOUT);
|
|
|
|
wake_up_interruptible_poll(&tty->read_wait, EPOLLIN);
|
2013-06-15 19:04:48 +08:00
|
|
|
|
2009-06-11 19:50:12 +08:00
|
|
|
/*
|
|
|
|
* Shutdown the current line discipline, and reset it to
|
2010-02-08 18:09:26 +08:00
|
|
|
* N_TTY if need be.
|
|
|
|
*
|
|
|
|
* Avoid racing set_ldisc or tty_ldisc_release
|
2009-06-11 19:50:12 +08:00
|
|
|
*/
|
2014-11-06 01:13:07 +08:00
|
|
|
tty_ldisc_lock(tty, MAX_SCHEDULE_TIMEOUT);
|
2010-06-02 04:53:06 +08:00
|
|
|
|
tty: Destroy ldisc instance on hangup
Currently, when the tty is hungup, the ldisc is re-instanced; ie., the
current instance is destroyed and a new instance is created. The purpose
of this design was to guarantee a valid, open ldisc for the lifetime of
the tty.
However, now that tty buffers are owned by and have lifetime equivalent
to the tty_port (since v3.10), any data received immediately after the
ldisc is re-instanced may cause continued driver i/o operations
concurrently with the driver's hangup() operation. For drivers that
shutdown h/w on hangup, this is unexpected and usually bad. For example,
the serial core may free the xmit buffer page concurrently with an
in-progress write() operation (triggered by echo).
With the existing stable and robust ldisc reference handling, the
cleaned-up tty_reopen(), the straggling unsafe ldisc use cleaned up, and
the preparation to properly handle a NULL tty->ldisc, the ldisc instance
can be destroyed and only re-instanced when the tty is re-opened.
If the tty was opened as /dev/console or /dev/tty0, the original behavior
of re-instancing the ldisc is retained (the 'reinit' parameter to
tty_ldisc_hangup() is true). This is required since those file descriptors
are never hungup.
This patch has neglible impact on userspace; the tty file_operations ptr
is changed to point to the hungup file operations _before_ the ldisc
instance is destroyed, so only racing file operations might now retrieve
a NULL ldisc reference (which is simply handled as if the hungup file
operation had been called instead -- see "tty: Prepare for destroying
line discipline on hangup").
This resolves a long-standing FIXME and several crash reports.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-01-11 14:41:06 +08:00
|
|
|
if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS)
|
|
|
|
tty_reset_termios(tty);
|
2013-03-12 04:44:36 +08:00
|
|
|
|
tty: Destroy ldisc instance on hangup
Currently, when the tty is hungup, the ldisc is re-instanced; ie., the
current instance is destroyed and a new instance is created. The purpose
of this design was to guarantee a valid, open ldisc for the lifetime of
the tty.
However, now that tty buffers are owned by and have lifetime equivalent
to the tty_port (since v3.10), any data received immediately after the
ldisc is re-instanced may cause continued driver i/o operations
concurrently with the driver's hangup() operation. For drivers that
shutdown h/w on hangup, this is unexpected and usually bad. For example,
the serial core may free the xmit buffer page concurrently with an
in-progress write() operation (triggered by echo).
With the existing stable and robust ldisc reference handling, the
cleaned-up tty_reopen(), the straggling unsafe ldisc use cleaned up, and
the preparation to properly handle a NULL tty->ldisc, the ldisc instance
can be destroyed and only re-instanced when the tty is re-opened.
If the tty was opened as /dev/console or /dev/tty0, the original behavior
of re-instancing the ldisc is retained (the 'reinit' parameter to
tty_ldisc_hangup() is true). This is required since those file descriptors
are never hungup.
This patch has neglible impact on userspace; the tty file_operations ptr
is changed to point to the hungup file operations _before_ the ldisc
instance is destroyed, so only racing file operations might now retrieve
a NULL ldisc reference (which is simply handled as if the hungup file
operation had been called instead -- see "tty: Prepare for destroying
line discipline on hangup").
This resolves a long-standing FIXME and several crash reports.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-01-11 14:41:06 +08:00
|
|
|
if (tty->ldisc) {
|
|
|
|
if (reinit) {
|
2017-10-14 06:58:08 +08:00
|
|
|
if (tty_ldisc_reinit(tty, tty->termios.c_line) < 0 &&
|
|
|
|
tty_ldisc_reinit(tty, N_TTY) < 0)
|
|
|
|
WARN_ON(tty_ldisc_reinit(tty, N_NULL) < 0);
|
tty: Destroy ldisc instance on hangup
Currently, when the tty is hungup, the ldisc is re-instanced; ie., the
current instance is destroyed and a new instance is created. The purpose
of this design was to guarantee a valid, open ldisc for the lifetime of
the tty.
However, now that tty buffers are owned by and have lifetime equivalent
to the tty_port (since v3.10), any data received immediately after the
ldisc is re-instanced may cause continued driver i/o operations
concurrently with the driver's hangup() operation. For drivers that
shutdown h/w on hangup, this is unexpected and usually bad. For example,
the serial core may free the xmit buffer page concurrently with an
in-progress write() operation (triggered by echo).
With the existing stable and robust ldisc reference handling, the
cleaned-up tty_reopen(), the straggling unsafe ldisc use cleaned up, and
the preparation to properly handle a NULL tty->ldisc, the ldisc instance
can be destroyed and only re-instanced when the tty is re-opened.
If the tty was opened as /dev/console or /dev/tty0, the original behavior
of re-instancing the ldisc is retained (the 'reinit' parameter to
tty_ldisc_hangup() is true). This is required since those file descriptors
are never hungup.
This patch has neglible impact on userspace; the tty file_operations ptr
is changed to point to the hungup file operations _before_ the ldisc
instance is destroyed, so only racing file operations might now retrieve
a NULL ldisc reference (which is simply handled as if the hungup file
operation had been called instead -- see "tty: Prepare for destroying
line discipline on hangup").
This resolves a long-standing FIXME and several crash reports.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-01-11 14:41:06 +08:00
|
|
|
} else
|
|
|
|
tty_ldisc_kill(tty);
|
2009-06-11 19:50:12 +08:00
|
|
|
}
|
2014-11-06 01:13:07 +08:00
|
|
|
tty_ldisc_unlock(tty);
|
2009-06-11 19:50:12 +08:00
|
|
|
}
|
2008-07-22 18:16:55 +08:00
|
|
|
|
|
|
|
/**
|
|
|
|
* tty_ldisc_setup - open line discipline
|
|
|
|
* @tty: tty being shut down
|
|
|
|
* @o_tty: pair tty for pty/tty pairs
|
|
|
|
*
|
|
|
|
* Called during the initial open of a tty/pty pair in order to set up the
|
2009-06-11 19:50:12 +08:00
|
|
|
* line disciplines and bind them to the tty. This has no locking issues
|
|
|
|
* as the device isn't yet active.
|
2008-07-22 18:16:55 +08:00
|
|
|
*/
|
|
|
|
|
|
|
|
int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty)
|
|
|
|
{
|
2016-01-11 14:41:08 +08:00
|
|
|
int retval = tty_ldisc_open(tty, tty->ldisc);
|
2021-04-07 15:06:47 +08:00
|
|
|
|
2009-06-11 19:50:12 +08:00
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
|
|
|
|
if (o_tty) {
|
2018-11-01 08:24:51 +08:00
|
|
|
/*
|
|
|
|
* Called without o_tty->ldisc_sem held, as o_tty has been
|
|
|
|
* just allocated and no one has a reference to it.
|
|
|
|
*/
|
2009-06-11 19:50:12 +08:00
|
|
|
retval = tty_ldisc_open(o_tty, o_tty->ldisc);
|
2008-07-22 18:16:55 +08:00
|
|
|
if (retval) {
|
2016-01-11 14:41:08 +08:00
|
|
|
tty_ldisc_close(tty, tty->ldisc);
|
2008-07-22 18:16:55 +08:00
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
2012-08-08 23:30:13 +08:00
|
|
|
|
2008-07-22 18:16:55 +08:00
|
|
|
/**
|
|
|
|
* tty_ldisc_release - release line discipline
|
2014-11-06 01:12:58 +08:00
|
|
|
* @tty: tty being shut down (or one end of pty pair)
|
2014-11-06 01:12:44 +08:00
|
|
|
*
|
2014-11-06 01:12:58 +08:00
|
|
|
* Called during the final close of a tty or a pty pair in order to shut
|
2016-01-11 14:41:00 +08:00
|
|
|
* down the line discpline layer. On exit, each tty's ldisc is NULL.
|
2008-07-22 18:16:55 +08:00
|
|
|
*/
|
|
|
|
|
2014-11-06 01:12:58 +08:00
|
|
|
void tty_ldisc_release(struct tty_struct *tty)
|
2008-07-22 18:16:55 +08:00
|
|
|
{
|
2014-11-06 01:12:58 +08:00
|
|
|
struct tty_struct *o_tty = tty->link;
|
|
|
|
|
2008-07-22 18:16:55 +08:00
|
|
|
/*
|
2013-03-12 04:44:35 +08:00
|
|
|
* Shutdown this line discipline. As this is the final close,
|
|
|
|
* it does not race with the set_ldisc code path.
|
2008-07-22 18:16:55 +08:00
|
|
|
*/
|
|
|
|
|
2013-06-15 19:04:48 +08:00
|
|
|
tty_ldisc_lock_pair(tty, o_tty);
|
2012-08-08 23:30:13 +08:00
|
|
|
tty_ldisc_kill(tty);
|
2009-06-11 19:50:12 +08:00
|
|
|
if (o_tty)
|
2012-08-08 23:30:13 +08:00
|
|
|
tty_ldisc_kill(o_tty);
|
2013-06-15 19:04:48 +08:00
|
|
|
tty_ldisc_unlock_pair(tty, o_tty);
|
|
|
|
|
2021-04-07 15:06:48 +08:00
|
|
|
/*
|
|
|
|
* And the memory resources remaining (buffers, termios) will be
|
|
|
|
* disposed of when the kref hits zero
|
|
|
|
*/
|
2013-03-12 04:44:38 +08:00
|
|
|
|
2015-07-13 10:49:12 +08:00
|
|
|
tty_ldisc_debug(tty, "released\n");
|
2008-07-22 18:16:55 +08:00
|
|
|
}
|
2017-05-16 01:45:33 +08:00
|
|
|
EXPORT_SYMBOL_GPL(tty_ldisc_release);
|
2008-07-22 18:16:55 +08:00
|
|
|
|
|
|
|
/**
|
|
|
|
* tty_ldisc_init - ldisc setup for new tty
|
|
|
|
* @tty: tty being allocated
|
|
|
|
*
|
|
|
|
* Set up the line discipline objects for a newly allocated tty. Note that
|
|
|
|
* the tty structure is not completely set up when this call is made.
|
|
|
|
*/
|
|
|
|
|
2018-04-05 18:40:16 +08:00
|
|
|
int tty_ldisc_init(struct tty_struct *tty)
|
2008-07-22 18:16:55 +08:00
|
|
|
{
|
2013-06-15 19:04:48 +08:00
|
|
|
struct tty_ldisc *ld = tty_ldisc_get(tty, N_TTY);
|
2021-04-07 15:06:47 +08:00
|
|
|
|
2009-06-11 19:50:12 +08:00
|
|
|
if (IS_ERR(ld))
|
2018-04-05 18:40:16 +08:00
|
|
|
return PTR_ERR(ld);
|
2013-03-12 04:44:42 +08:00
|
|
|
tty->ldisc = ld;
|
2018-04-05 18:40:16 +08:00
|
|
|
return 0;
|
2008-07-22 18:16:55 +08:00
|
|
|
}
|
|
|
|
|
2011-03-23 17:48:35 +08:00
|
|
|
/**
|
2016-01-10 13:13:46 +08:00
|
|
|
* tty_ldisc_deinit - ldisc cleanup for new tty
|
2011-03-23 17:48:35 +08:00
|
|
|
* @tty: tty that was allocated recently
|
|
|
|
*
|
|
|
|
* The tty structure must not becompletely set up (tty_ldisc_setup) when
|
|
|
|
* this call is made.
|
|
|
|
*/
|
|
|
|
void tty_ldisc_deinit(struct tty_struct *tty)
|
|
|
|
{
|
2018-11-01 08:24:51 +08:00
|
|
|
/* no ldisc_sem, tty is being destroyed */
|
2016-01-10 13:13:46 +08:00
|
|
|
if (tty->ldisc)
|
|
|
|
tty_ldisc_put(tty->ldisc);
|
2013-03-12 04:44:42 +08:00
|
|
|
tty->ldisc = NULL;
|
2011-03-23 17:48:35 +08:00
|
|
|
}
|
2019-01-22 00:26:42 +08:00
|
|
|
|
|
|
|
static struct ctl_table tty_table[] = {
|
|
|
|
{
|
|
|
|
.procname = "ldisc_autoload",
|
|
|
|
.data = &tty_ldisc_autoload,
|
|
|
|
.maxlen = sizeof(tty_ldisc_autoload),
|
|
|
|
.mode = 0644,
|
|
|
|
.proc_handler = proc_dointvec,
|
proc/sysctl: add shared variables for range check
In the sysctl code the proc_dointvec_minmax() function is often used to
validate the user supplied value between an allowed range. This
function uses the extra1 and extra2 members from struct ctl_table as
minimum and maximum allowed value.
On sysctl handler declaration, in every source file there are some
readonly variables containing just an integer which address is assigned
to the extra1 and extra2 members, so the sysctl range is enforced.
The special values 0, 1 and INT_MAX are very often used as range
boundary, leading duplication of variables like zero=0, one=1,
int_max=INT_MAX in different source files:
$ git grep -E '\.extra[12].*&(zero|one|int_max)' |wc -l
248
Add a const int array containing the most commonly used values, some
macros to refer more easily to the correct array member, and use them
instead of creating a local one for every object file.
This is the bloat-o-meter output comparing the old and new binary
compiled with the default Fedora config:
# scripts/bloat-o-meter -d vmlinux.o.old vmlinux.o
add/remove: 2/2 grow/shrink: 0/2 up/down: 24/-188 (-164)
Data old new delta
sysctl_vals - 12 +12
__kstrtab_sysctl_vals - 12 +12
max 14 10 -4
int_max 16 - -16
one 68 - -68
zero 128 28 -100
Total: Before=20583249, After=20583085, chg -0.00%
[mcroce@redhat.com: tipc: remove two unused variables]
Link: http://lkml.kernel.org/r/20190530091952.4108-1-mcroce@redhat.com
[akpm@linux-foundation.org: fix net/ipv6/sysctl_net_ipv6.c]
[arnd@arndb.de: proc/sysctl: make firmware loader table conditional]
Link: http://lkml.kernel.org/r/20190617130014.1713870-1-arnd@arndb.de
[akpm@linux-foundation.org: fix fs/eventpoll.c]
Link: http://lkml.kernel.org/r/20190430180111.10688-1-mcroce@redhat.com
Signed-off-by: Matteo Croce <mcroce@redhat.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Aaron Tomlin <atomlin@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-07-19 06:58:50 +08:00
|
|
|
.extra1 = SYSCTL_ZERO,
|
|
|
|
.extra2 = SYSCTL_ONE,
|
2019-01-22 00:26:42 +08:00
|
|
|
},
|
|
|
|
{ }
|
|
|
|
};
|
|
|
|
|
|
|
|
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);
|
|
|
|
}
|