Merge branch 'depends/tty' into next/headers

Merging in Greg's tty tree including a cleanup patch needed by the OMAP serial
header cleanups.

* depends/tty: (305 commits)
  tty/serial/8250: Make omap hardware workarounds local to 8250.h
  serial/8250/8250_early: Prevent rounding error in uartclk
  serial: samsung: use clk_prepare_enable and clk_disable_unprepare
  TTY: Report warning when low_latency flag is wrongly used
  console: use might_sleep in console_lock
  TTY: move tty buffers to tty_port
  TTY: add port -> tty link
  TTY: tty_buffer, cache pointer to tty->buf
  TTY: move TTY_FLUSH* flags to tty_port
  TTY: n_tty, propagate n_tty_data
  TTY: move ldisc data from tty_struct: locks
  TTY: move ldisc data from tty_struct: read_* and echo_* and canon_* stuff
  TTY: move ldisc data from tty_struct: bitmaps
  TTY: move ldisc data from tty_struct: simple members
  TTY: n_tty, add ldisc data to n_tty
  TTY: audit, stop accessing tty->icount
  TTY: n_tty, remove bogus checks
  TTY: n_tty, simplify read_buf+echo_buf allocation
  TTY: hci_ldisc, remove invalid check in open
  TTY: ldisc, wait for idle ldisc in release
  ...

6 files changed, 57 insertions, 42 deletions

diff --git a/kernel/module-internal.h b/kernel/module-internal.h
index 6114a13..24f9247 100644
--- a/kernel/module-internal.h
+++ b/kernel/module-internal.h
@@ -11,5 +11,4 @@
 
 extern struct key *modsign_keyring;
 
-extern int mod_verify_sig(const void *mod, unsigned long modlen,
-			  const void *sig, unsigned long siglen);
+extern int mod_verify_sig(const void *mod, unsigned long *_modlen);
diff --git a/kernel/module.c b/kernel/module.c
index 0e2da86..6085f5e 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2421,25 +2421,17 @@ static inline void kmemleak_load_module(const struct module *mod,
 
 #ifdef CONFIG_MODULE_SIG
 static int module_sig_check(struct load_info *info,
-			    const void *mod, unsigned long *len)
+			    const void *mod, unsigned long *_len)
 {
 	int err = -ENOKEY;
-	const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1;
-	const void *p = mod, *end = mod + *len;
-
-	/* Poor man's memmem. */
-	while ((p = memchr(p, MODULE_SIG_STRING[0], end - p))) {
-		if (p + markerlen > end)
-			break;
-
-		if (memcmp(p, MODULE_SIG_STRING, markerlen) == 0) {
-			const void *sig = p + markerlen;
-			/* Truncate module up to signature. */
-			*len = p - mod;
-			err = mod_verify_sig(mod, *len, sig, end - sig);
-			break;
-		}
-		p++;
+	unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1;
+	unsigned long len = *_len;
+
+	if (len > markerlen &&
+	    memcmp(mod + len - markerlen, MODULE_SIG_STRING, markerlen) == 0) {
+		/* We truncate the module to discard the signature */
+		*_len -= markerlen;
+		err = mod_verify_sig(mod, _len);
 	}
 
 	if (!err) {
diff --git a/kernel/module_signing.c b/kernel/module_signing.c
index 6b09f69..d492a23 100644
--- a/kernel/module_signing.c
+++ b/kernel/module_signing.c
@@ -183,27 +183,33 @@ static struct key *request_asymmetric_key(const char *signer, size_t signer_len,
 /*
  * Verify the signature on a module.
  */
-int mod_verify_sig(const void *mod, unsigned long modlen,
-		   const void *sig, unsigned long siglen)
+int mod_verify_sig(const void *mod, unsigned long *_modlen)
 {
 	struct public_key_signature *pks;
 	struct module_signature ms;
 	struct key *key;
-	size_t sig_len;
+	const void *sig;
+	size_t modlen = *_modlen, sig_len;
 	int ret;
 
-	pr_devel("==>%s(,%lu,,%lu,)\n", __func__, modlen, siglen);
+	pr_devel("==>%s(,%lu)\n", __func__, modlen);
 
-	if (siglen <= sizeof(ms))
+	if (modlen <= sizeof(ms))
 		return -EBADMSG;
 
-	memcpy(&ms, sig + (siglen - sizeof(ms)), sizeof(ms));
-	siglen -= sizeof(ms);
+	memcpy(&ms, mod + (modlen - sizeof(ms)), sizeof(ms));
+	modlen -= sizeof(ms);
 
 	sig_len = be32_to_cpu(ms.sig_len);
-	if (sig_len >= siglen ||
-	    siglen - sig_len != (size_t)ms.signer_len + ms.key_id_len)
+	if (sig_len >= modlen)
 		return -EBADMSG;
+	modlen -= sig_len;
+	if ((size_t)ms.signer_len + ms.key_id_len >= modlen)
+		return -EBADMSG;
+	modlen -= (size_t)ms.signer_len + ms.key_id_len;
+
+	*_modlen = modlen;
+	sig = mod + modlen;
 
 	/* For the moment, only support RSA and X.509 identifiers */
 	if (ms.algo != PKEY_ALGO_RSA ||
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 478bad2..eb00be2 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -133,19 +133,26 @@ struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *old
 	return create_pid_namespace(old_ns);
 }
 
-void free_pid_ns(struct kref *kref)
+static void free_pid_ns(struct kref *kref)
 {
-	struct pid_namespace *ns, *parent;
+	struct pid_namespace *ns;
 
 	ns = container_of(kref, struct pid_namespace, kref);
-
-	parent = ns->parent;
 	destroy_pid_namespace(ns);
+}
 
-	if (parent != NULL)
-		put_pid_ns(parent);
+void put_pid_ns(struct pid_namespace *ns)
+{
+	struct pid_namespace *parent;
+
+	while (ns != &init_pid_ns) {
+		parent = ns->parent;
+		if (!kref_put(&ns->kref, free_pid_ns))
+			break;
+		ns = parent;
+	}
 }
-EXPORT_SYMBOL_GPL(free_pid_ns);
+EXPORT_SYMBOL_GPL(put_pid_ns);
 
 void zap_pid_ns_processes(struct pid_namespace *pid_ns)
 {
diff --git a/kernel/printk.c b/kernel/printk.c
index 66a2ea3..22e070f 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -87,6 +87,12 @@ static DEFINE_SEMAPHORE(console_sem);
 struct console *console_drivers;
 EXPORT_SYMBOL_GPL(console_drivers);
 
+#ifdef CONFIG_LOCKDEP
+static struct lockdep_map console_lock_dep_map = {
+	.name = "console_lock"
+};
+#endif
+
 /*
  * This is used for debugging the mess that is the VT code by
  * keeping track if we have the console semaphore held. It's
@@ -1890,7 +1896,6 @@ static int __cpuinit console_cpu_notify(struct notifier_block *self,
 	switch (action) {
 	case CPU_ONLINE:
 	case CPU_DEAD:
-	case CPU_DYING:
 	case CPU_DOWN_FAILED:
 	case CPU_UP_CANCELED:
 		console_lock();
@@ -1909,12 +1914,14 @@ static int __cpuinit console_cpu_notify(struct notifier_block *self,
  */
 void console_lock(void)
 {
-	BUG_ON(in_interrupt());
+	might_sleep();
+
 	down(&console_sem);
 	if (console_suspended)
 		return;
 	console_locked = 1;
 	console_may_schedule = 1;
+	mutex_acquire(&console_lock_dep_map, 0, 0, _RET_IP_);
 }
 EXPORT_SYMBOL(console_lock);
 
@@ -1936,6 +1943,7 @@ int console_trylock(void)
 	}
 	console_locked = 1;
 	console_may_schedule = 0;
+	mutex_acquire(&console_lock_dep_map, 0, 1, _RET_IP_);
 	return 1;
 }
 EXPORT_SYMBOL(console_trylock);
@@ -2096,6 +2104,7 @@ skip:
 		local_irq_restore(flags);
 	}
 	console_locked = 0;
+	mutex_release(&console_lock_dep_map, 1, _RET_IP_);
 
 	/* Release the exclusive_console once it is used */
 	if (unlikely(exclusive_console))
diff --git a/kernel/sys.c b/kernel/sys.c
index c5cb5b9..e6e0ece 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1265,15 +1265,16 @@ DECLARE_RWSEM(uts_sem);
  * Work around broken programs that cannot handle "Linux 3.0".
  * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40
  */
-static int override_release(char __user *release, int len)
+static int override_release(char __user *release, size_t len)
 {
 	int ret = 0;
-	char buf[65];
 
 	if (current->personality & UNAME26) {
-		char *rest = UTS_RELEASE;
+		const char *rest = UTS_RELEASE;
+		char buf[65] = { 0 };
 		int ndots = 0;
 		unsigned v;
+		size_t copy;
 
 		while (*rest) {
 			if (*rest == '.' && ++ndots >= 3)
@@ -1283,8 +1284,9 @@ static int override_release(char __user *release, int len)
 			rest++;
 		}
 		v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 40;
-		snprintf(buf, len, "2.6.%u%s", v, rest);
-		ret = copy_to_user(release, buf, len);
+		copy = clamp_t(size_t, len, 1, sizeof(buf));
+		copy = scnprintf(buf, copy, "2.6.%u%s", v, rest);
+		ret = copy_to_user(release, buf, copy + 1);
 	}
 	return ret;
 }