Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 194 insertions, 0 deletions

diff --git a/drivers/char/tpm/eventlog/common.c b/drivers/char/tpm/eventlog/common.c
new file mode 100644
index 000000000..462476467
--- /dev/null
+++ b/drivers/char/tpm/eventlog/common.c
@@ -0,0 +1,194 @@
+/*
+ * Copyright (C) 2005, 2012 IBM Corporation
+ *
+ * Authors:
+ *	Kent Yoder <key@linux.vnet.ibm.com>
+ *	Seiji Munetoh <munetoh@jp.ibm.com>
+ *	Stefan Berger <stefanb@us.ibm.com>
+ *	Reiner Sailer <sailer@watson.ibm.com>
+ *	Kylene Hall <kjhall@us.ibm.com>
+ *	Nayna Jain <nayna@linux.vnet.ibm.com>
+ *
+ * Access to the event log created by a system's firmware / BIOS
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <linux/seq_file.h>
+#include <linux/fs.h>
+#include <linux/security.h>
+#include <linux/module.h>
+#include <linux/tpm_eventlog.h>
+
+#include "../tpm.h"
+#include "common.h"
+
+static int tpm_bios_measurements_open(struct inode *inode,
+					    struct file *file)
+{
+	int err;
+	struct seq_file *seq;
+	struct tpm_chip_seqops *chip_seqops;
+	const struct seq_operations *seqops;
+	struct tpm_chip *chip;
+
+	inode_lock(inode);
+	if (!inode->i_private) {
+		inode_unlock(inode);
+		return -ENODEV;
+	}
+	chip_seqops = (struct tpm_chip_seqops *)inode->i_private;
+	seqops = chip_seqops->seqops;
+	chip = chip_seqops->chip;
+	get_device(&chip->dev);
+	inode_unlock(inode);
+
+	/* now register seq file */
+	err = seq_open(file, seqops);
+	if (!err) {
+		seq = file->private_data;
+		seq->private = chip;
+	}
+
+	return err;
+}
+
+static int tpm_bios_measurements_release(struct inode *inode,
+					 struct file *file)
+{
+	struct seq_file *seq = (struct seq_file *)file->private_data;
+	struct tpm_chip *chip = (struct tpm_chip *)seq->private;
+
+	put_device(&chip->dev);
+
+	return seq_release(inode, file);
+}
+
+static const struct file_operations tpm_bios_measurements_ops = {
+	.owner = THIS_MODULE,
+	.open = tpm_bios_measurements_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = tpm_bios_measurements_release,
+};
+
+static int tpm_read_log(struct tpm_chip *chip)
+{
+	int rc;
+
+	if (chip->log.bios_event_log != NULL) {
+		dev_dbg(&chip->dev,
+			"%s: ERROR - event log already initialized\n",
+			__func__);
+		return -EFAULT;
+	}
+
+	rc = tpm_read_log_acpi(chip);
+	if (rc != -ENODEV)
+		return rc;
+
+	rc = tpm_read_log_efi(chip);
+	if (rc != -ENODEV)
+		return rc;
+
+	return tpm_read_log_of(chip);
+}
+
+/*
+ * tpm_bios_log_setup() - Read the event log from the firmware
+ * @chip: TPM chip to use.
+ *
+ * If an event log is found then the securityfs files are setup to
+ * export it to userspace, otherwise nothing is done.
+ */
+void tpm_bios_log_setup(struct tpm_chip *chip)
+{
+	const char *name = dev_name(&chip->dev);
+	unsigned int cnt;
+	int log_version;
+	int rc = 0;
+
+	if (chip->flags & TPM_CHIP_FLAG_VIRTUAL)
+		return;
+
+	rc = tpm_read_log(chip);
+	if (rc < 0)
+		return;
+	log_version = rc;
+
+	cnt = 0;
+	chip->bios_dir[cnt] = securityfs_create_dir(name, NULL);
+	/* NOTE: securityfs_create_dir can return ENODEV if securityfs is
+	 * compiled out. The caller should ignore the ENODEV return code.
+	 */
+	if (IS_ERR(chip->bios_dir[cnt]))
+		goto err;
+	cnt++;
+
+	chip->bin_log_seqops.chip = chip;
+	if (log_version == EFI_TCG2_EVENT_LOG_FORMAT_TCG_2)
+		chip->bin_log_seqops.seqops =
+			&tpm2_binary_b_measurements_seqops;
+	else
+		chip->bin_log_seqops.seqops =
+			&tpm1_binary_b_measurements_seqops;
+
+
+	chip->bios_dir[cnt] =
+	    securityfs_create_file("binary_bios_measurements",
+				   0440, chip->bios_dir[0],
+				   (void *)&chip->bin_log_seqops,
+				   &tpm_bios_measurements_ops);
+	if (IS_ERR(chip->bios_dir[cnt]))
+		goto err;
+	cnt++;
+
+	if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) {
+
+		chip->ascii_log_seqops.chip = chip;
+		chip->ascii_log_seqops.seqops =
+			&tpm1_ascii_b_measurements_seqops;
+
+		chip->bios_dir[cnt] =
+			securityfs_create_file("ascii_bios_measurements",
+					       0440, chip->bios_dir[0],
+					       (void *)&chip->ascii_log_seqops,
+					       &tpm_bios_measurements_ops);
+		if (IS_ERR(chip->bios_dir[cnt]))
+			goto err;
+		cnt++;
+	}
+
+	return;
+
+err:
+	chip->bios_dir[cnt] = NULL;
+	tpm_bios_log_teardown(chip);
+	return;
+}
+
+void tpm_bios_log_teardown(struct tpm_chip *chip)
+{
+	int i;
+	struct inode *inode;
+
+	/* securityfs_remove currently doesn't take care of handling sync
+	 * between removal and opening of pseudo files. To handle this, a
+	 * workaround is added by making i_private = NULL here during removal
+	 * and to check it during open(), both within inode_lock()/unlock().
+	 * This design ensures that open() either safely gets kref or fails.
+	 */
+	for (i = (TPM_NUM_EVENT_LOG_FILES - 1); i >= 0; i--) {
+		if (chip->bios_dir[i]) {
+			inode = d_inode(chip->bios_dir[i]);
+			inode_lock(inode);
+			inode->i_private = NULL;
+			inode_unlock(inode);
+			securityfs_remove(chip->bios_dir[i]);
+		}
+	}
+}