scftorture: Count single_rpc offline failures in statistics outputgrafted

scf_torture_stats_print() aggregates each invoker thread's counters
into a local scf_statistics structure before printing, but the
n_single_rpc_ofl field is missing from the aggregation loop.  As a
result, the "single_rpc_ofl" value printed in the statistics line is
always zero, even when smp_call_function_single() invocations for the
RPC test have failed due to offline CPUs and been counted by the
invoker threads.

Add the missing accumulation so that the printed value reflects the
actual counts.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

1 files changed, 251 insertions, 0 deletions

diff --git a/drivers/tty/tty_audit.c b/drivers/tty/tty_audit.c
new file mode 100644
index 000000000..d014af6ab
--- /dev/null
+++ b/drivers/tty/tty_audit.c
@@ -0,0 +1,251 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Creating audit events from TTY input.
+ *
+ * Copyright (C) 2007 Red Hat, Inc.  All rights reserved.
+ *
+ * Authors: Miloslav Trmac <mitr@redhat.com>
+ */
+
+#include <linux/audit.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include "tty.h"
+
+#define TTY_AUDIT_BUF_SIZE	4096
+
+struct tty_audit_buf {
+	struct mutex mutex;	/* Protects all data below */
+	dev_t dev;		/* The TTY which the data is from */
+	bool icanon;
+	size_t valid;
+	u8 *data;		/* Allocated size TTY_AUDIT_BUF_SIZE */
+};
+
+static struct tty_audit_buf *tty_audit_buf_ref(void)
+{
+	struct tty_audit_buf *buf;
+
+	buf = current->signal->tty_audit_buf;
+	WARN_ON(buf == ERR_PTR(-ESRCH));
+	return buf;
+}
+
+static struct tty_audit_buf *tty_audit_buf_alloc(void)
+{
+	struct tty_audit_buf *buf;
+
+	buf = kzalloc_obj(*buf);
+	if (!buf)
+		goto err;
+
+	buf->data = kmalloc(TTY_AUDIT_BUF_SIZE, GFP_KERNEL);
+	if (!buf->data)
+		goto err_buf;
+
+	mutex_init(&buf->mutex);
+
+	return buf;
+
+err_buf:
+	kfree(buf);
+err:
+	return NULL;
+}
+
+static void tty_audit_buf_free(struct tty_audit_buf *buf)
+{
+	WARN_ON(buf->valid != 0);
+	kfree(buf->data);
+	kfree(buf);
+}
+
+static void tty_audit_log(const char *description, dev_t dev,
+			  const u8 *data, size_t size)
+{
+	struct audit_buffer *ab;
+	pid_t pid = task_pid_nr(current);
+	uid_t uid = from_kuid(&init_user_ns, task_uid(current));
+	uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(current));
+	unsigned int sessionid = audit_get_sessionid(current);
+	char name[TASK_COMM_LEN];
+
+	ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_TTY);
+	if (!ab)
+		return;
+
+	audit_log_format(ab, "%s pid=%u uid=%u auid=%u ses=%u major=%d minor=%d comm=",
+			 description, pid, uid, loginuid, sessionid,
+			 MAJOR(dev), MINOR(dev));
+	get_task_comm(name, current);
+	audit_log_untrustedstring(ab, name);
+	audit_log_format(ab, " data=");
+	audit_log_n_hex(ab, data, size);
+	audit_log_end(ab);
+}
+
+/*
+ *	tty_audit_buf_push	-	Push buffered data out
+ *
+ *	Generate an audit message from the contents of @buf, which is owned by
+ *	the current task.  @buf->mutex must be locked.
+ */
+static void tty_audit_buf_push(struct tty_audit_buf *buf)
+{
+	if (buf->valid == 0)
+		return;
+	if (audit_enabled == AUDIT_OFF) {
+		buf->valid = 0;
+		return;
+	}
+	tty_audit_log("tty", buf->dev, buf->data, buf->valid);
+	buf->valid = 0;
+}
+
+/**
+ *	tty_audit_exit	-	Handle a task exit
+ *
+ *	Make sure all buffered data is written out and deallocate the buffer.
+ *	Only needs to be called if current->signal->tty_audit_buf != %NULL.
+ *
+ *	The process is single-threaded at this point; no other threads share
+ *	current->signal.
+ */
+void tty_audit_exit(void)
+{
+	struct tty_audit_buf *buf;
+
+	buf = xchg(&current->signal->tty_audit_buf, ERR_PTR(-ESRCH));
+	if (!buf)
+		return;
+
+	tty_audit_buf_push(buf);
+	tty_audit_buf_free(buf);
+}
+
+/*
+ *	tty_audit_fork	-	Copy TTY audit state for a new task
+ *
+ *	Set up TTY audit state in @sig from current.  @sig needs no locking.
+ */
+void tty_audit_fork(struct signal_struct *sig)
+{
+	sig->audit_tty = current->signal->audit_tty;
+}
+
+/*
+ *	tty_audit_tiocsti	-	Log TIOCSTI
+ */
+void tty_audit_tiocsti(const struct tty_struct *tty, u8 ch)
+{
+	dev_t dev;
+
+	dev = MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index;
+	if (tty_audit_push())
+		return;
+
+	if (audit_enabled)
+		tty_audit_log("ioctl=TIOCSTI", dev, &ch, 1);
+}
+
+/*
+ *	tty_audit_push	-	Flush current's pending audit data
+ *
+ *	Returns 0 if success, -EPERM if tty audit is disabled
+ */
+int tty_audit_push(void)
+{
+	struct tty_audit_buf *buf;
+
+	if (~current->signal->audit_tty & AUDIT_TTY_ENABLE)
+		return -EPERM;
+
+	buf = tty_audit_buf_ref();
+	if (!IS_ERR_OR_NULL(buf)) {
+		mutex_lock(&buf->mutex);
+		tty_audit_buf_push(buf);
+		mutex_unlock(&buf->mutex);
+	}
+	return 0;
+}
+
+/*
+ *	tty_audit_buf_get	-	Get an audit buffer.
+ *
+ *	Get an audit buffer, allocate it if necessary.  Return %NULL
+ *	if out of memory or ERR_PTR(-ESRCH) if tty_audit_exit() has already
+ *	occurred.  Otherwise, return a new reference to the buffer.
+ */
+static struct tty_audit_buf *tty_audit_buf_get(void)
+{
+	struct tty_audit_buf *buf;
+
+	buf = tty_audit_buf_ref();
+	if (buf)
+		return buf;
+
+	buf = tty_audit_buf_alloc();
+	if (buf == NULL) {
+		audit_log_lost("out of memory in TTY auditing");
+		return NULL;
+	}
+
+	/* Race to use this buffer, free it if another wins */
+	if (cmpxchg(&current->signal->tty_audit_buf, NULL, buf) != NULL)
+		tty_audit_buf_free(buf);
+	return tty_audit_buf_ref();
+}
+
+/*
+ *	tty_audit_add_data	-	Add data for TTY auditing.
+ *
+ *	Audit @data of @size from @tty, if necessary.
+ */
+void tty_audit_add_data(const struct tty_struct *tty, const void *data,
+			size_t size)
+{
+	struct tty_audit_buf *buf;
+	unsigned int audit_tty;
+	bool icanon = L_ICANON(tty);
+	dev_t dev;
+
+	audit_tty = READ_ONCE(current->signal->audit_tty);
+	if (~audit_tty & AUDIT_TTY_ENABLE)
+		return;
+
+	if (unlikely(size == 0))
+		return;
+
+	if (tty->driver->type == TTY_DRIVER_TYPE_PTY
+	    && tty->driver->subtype == PTY_TYPE_MASTER)
+		return;
+
+	if ((~audit_tty & AUDIT_TTY_LOG_PASSWD) && icanon && !L_ECHO(tty))
+		return;
+
+	buf = tty_audit_buf_get();
+	if (IS_ERR_OR_NULL(buf))
+		return;
+
+	mutex_lock(&buf->mutex);
+	dev = MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index;
+	if (buf->dev != dev || buf->icanon != icanon) {
+		tty_audit_buf_push(buf);
+		buf->dev = dev;
+		buf->icanon = icanon;
+	}
+	do {
+		size_t run;
+
+		run = TTY_AUDIT_BUF_SIZE - buf->valid;
+		if (run > size)
+			run = size;
+		memcpy(buf->data + buf->valid, data, run);
+		buf->valid += run;
+		data += run;
+		size -= run;
+		if (buf->valid == TTY_AUDIT_BUF_SIZE)
+			tty_audit_buf_push(buf);
+	} while (size != 0);
+	mutex_unlock(&buf->mutex);
+}