security/integrity/ima/ima_template_lib.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (C) 2013 Politecnico di Torino, Italy
  *                    TORSEC group -- http://security.polito.it
  *
  * Author: Roberto Sassu <roberto.sassu@polito.it>
  *
  * File: ima_template_lib.c
  *      Library of supported template fields.
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #include "ima_template_lib.h"

 static bool ima_template_hash_algo_allowed(u8 algo)
 {
 	if (algo == HASH_ALGO_SHA1 || algo == HASH_ALGO_MD5)
 		return true;

 	return false;
 }

 enum data_formats {
 	DATA_FMT_DIGEST = 0,
 	DATA_FMT_DIGEST_WITH_ALGO,
 	DATA_FMT_STRING,
 	DATA_FMT_HEX
 };

 static int ima_write_template_field_data(const void *data, const u32 datalen,
 					 enum data_formats datafmt,
 					 struct ima_field_data *field_data)
 {
 	u8 *buf, *buf_ptr;
 	u32 buflen = datalen;

 	if (datafmt == DATA_FMT_STRING)
 		buflen = datalen + 1;

 	buf = kzalloc(buflen, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;

 	memcpy(buf, data, datalen);

 	/*
 	 * Replace all space characters with underscore for event names and
 	 * strings. This avoid that, during the parsing of a measurements list,
 	 * filenames with spaces or that end with the suffix ' (deleted)' are
 	 * split into multiple template fields (the space is the delimitator
 	 * character for measurements lists in ASCII format).
 	 */
 	if (datafmt == DATA_FMT_STRING) {
 		for (buf_ptr = buf; buf_ptr - buf < datalen; buf_ptr++)
 			if (*buf_ptr == ' ')
 				*buf_ptr = '_';
 	}

 	field_data->data = buf;
 	field_data->len = buflen;
 	return 0;
 }

 static void ima_show_template_data_ascii(struct seq_file *m,
 					 enum ima_show_type show,
 					 enum data_formats datafmt,
 					 struct ima_field_data *field_data)
 {
 	u8 *buf_ptr = field_data->data;
 	u32 buflen = field_data->len;

 	switch (datafmt) {
 	case DATA_FMT_DIGEST_WITH_ALGO:
 		buf_ptr = strnchr(field_data->data, buflen, ':');
 		if (buf_ptr != field_data->data)
 			seq_printf(m, "%s", field_data->data);

 		/* skip ':' and '\0' */
 		buf_ptr += 2;
 		buflen -= buf_ptr - field_data->data;
 		/* fall through */
 	case DATA_FMT_DIGEST:
 	case DATA_FMT_HEX:
 		if (!buflen)
 			break;
 		ima_print_digest(m, buf_ptr, buflen);
 		break;
 	case DATA_FMT_STRING:
 		seq_printf(m, "%s", buf_ptr);
 		break;
 	default:
 		break;
 	}
 }

 static void ima_show_template_data_binary(struct seq_file *m,
 					  enum ima_show_type show,
 					  enum data_formats datafmt,
 					  struct ima_field_data *field_data)
 {
 	u32 len = (show == IMA_SHOW_BINARY_OLD_STRING_FMT) ?
 	    strlen(field_data->data) : field_data->len;

 	if (show != IMA_SHOW_BINARY_NO_FIELD_LEN) {
 		u32 field_len = !ima_canonical_fmt ? len : cpu_to_le32(len);

 		ima_putc(m, &field_len, sizeof(field_len));
 	}

 	if (!len)
 		return;

 	ima_putc(m, field_data->data, len);
 }

 static void ima_show_template_field_data(struct seq_file *m,
 					 enum ima_show_type show,
 					 enum data_formats datafmt,
 					 struct ima_field_data *field_data)
 {
 	switch (show) {
 	case IMA_SHOW_ASCII:
 		ima_show_template_data_ascii(m, show, datafmt, field_data);
 		break;
 	case IMA_SHOW_BINARY:
 	case IMA_SHOW_BINARY_NO_FIELD_LEN:
 	case IMA_SHOW_BINARY_OLD_STRING_FMT:
 		ima_show_template_data_binary(m, show, datafmt, field_data);
 		break;
 	default:
 		break;
 	}
 }

 void ima_show_template_digest(struct seq_file *m, enum ima_show_type show,
 			      struct ima_field_data *field_data)
 {
 	ima_show_template_field_data(m, show, DATA_FMT_DIGEST, field_data);
 }

 void ima_show_template_digest_ng(struct seq_file *m, enum ima_show_type show,
 				 struct ima_field_data *field_data)
 {
 	ima_show_template_field_data(m, show, DATA_FMT_DIGEST_WITH_ALGO,
 				     field_data);
 }

 void ima_show_template_string(struct seq_file *m, enum ima_show_type show,
 			      struct ima_field_data *field_data)
 {
 	ima_show_template_field_data(m, show, DATA_FMT_STRING, field_data);
 }

 void ima_show_template_sig(struct seq_file *m, enum ima_show_type show,
 			   struct ima_field_data *field_data)
 {
 	ima_show_template_field_data(m, show, DATA_FMT_HEX, field_data);
 }

 void ima_show_template_buf(struct seq_file *m, enum ima_show_type show,
 			   struct ima_field_data *field_data)
 {
 	ima_show_template_field_data(m, show, DATA_FMT_HEX, field_data);
 }

 /**
  * ima_parse_buf() - Parses lengths and data from an input buffer
  * @bufstartp:       Buffer start address.
  * @bufendp:         Buffer end address.
  * @bufcurp:         Pointer to remaining (non-parsed) data.
  * @maxfields:       Length of fields array.
  * @fields:          Array containing lengths and pointers of parsed data.
  * @curfields:       Number of array items containing parsed data.
  * @len_mask:        Bitmap (if bit is set, data length should not be parsed).
  * @enforce_mask:    Check if curfields == maxfields and/or bufcurp == bufendp.
  * @bufname:         String identifier of the input buffer.
  *
  * Return: 0 on success, -EINVAL on error.
  */
 int ima_parse_buf(void *bufstartp, void *bufendp, void **bufcurp,
 		  int maxfields, struct ima_field_data *fields, int *curfields,
 		  unsigned long *len_mask, int enforce_mask, char *bufname)
 {
 	void *bufp = bufstartp;
 	int i;

 	for (i = 0; i < maxfields; i++) {
 		if (len_mask == NULL || !test_bit(i, len_mask)) {
 			if (bufp > (bufendp - sizeof(u32)))
 				break;

 			fields[i].len = *(u32 *)bufp;
 			if (ima_canonical_fmt)
 				fields[i].len = le32_to_cpu(fields[i].len);

 			bufp += sizeof(u32);
 		}

 		if (bufp > (bufendp - fields[i].len))
 			break;

 		fields[i].data = bufp;
 		bufp += fields[i].len;
 	}

 	if ((enforce_mask & ENFORCE_FIELDS) && i != maxfields) {
 		pr_err("%s: nr of fields mismatch: expected: %d, current: %d\n",
 		       bufname, maxfields, i);
 		return -EINVAL;
 	}

 	if ((enforce_mask & ENFORCE_BUFEND) && bufp != bufendp) {
 		pr_err("%s: buf end mismatch: expected: %p, current: %p\n",
 		       bufname, bufendp, bufp);
 		return -EINVAL;
 	}

 	if (curfields)
 		*curfields = i;

 	if (bufcurp)
 		*bufcurp = bufp;

 	return 0;
 }

 static int ima_eventdigest_init_common(u8 *digest, u32 digestsize, u8 hash_algo,
 				       struct ima_field_data *field_data)
 {
 	/*
 	 * digest formats:
 	 *  - DATA_FMT_DIGEST: digest
 	 *  - DATA_FMT_DIGEST_WITH_ALGO: [<hash algo>] + ':' + '\0' + digest,
 	 *    where <hash algo> is provided if the hash algoritm is not
 	 *    SHA1 or MD5
 	 */
 	u8 buffer[CRYPTO_MAX_ALG_NAME + 2 + IMA_MAX_DIGEST_SIZE] = { 0 };
 	enum data_formats fmt = DATA_FMT_DIGEST;
 	u32 offset = 0;

 	if (hash_algo < HASH_ALGO__LAST) {
 		fmt = DATA_FMT_DIGEST_WITH_ALGO;
 		offset += snprintf(buffer, CRYPTO_MAX_ALG_NAME + 1, "%s",
 				   hash_algo_name[hash_algo]);
 		buffer[offset] = ':';
 		offset += 2;
 	}

 	if (digest)
 		memcpy(buffer + offset, digest, digestsize);
 	else
 		/*
 		 * If digest is NULL, the event being recorded is a violation.
 		 * Make room for the digest by increasing the offset of
 		 * IMA_DIGEST_SIZE.
 		 */
 		offset += IMA_DIGEST_SIZE;

 	return ima_write_template_field_data(buffer, offset + digestsize,
 					     fmt, field_data);
 }

 /*
  * This function writes the digest of an event (with size limit).
  */
 int ima_eventdigest_init(struct ima_event_data *event_data,
 			 struct ima_field_data *field_data)
 {
 	struct {
 		struct ima_digest_data hdr;
 		char digest[IMA_MAX_DIGEST_SIZE];
 	} hash;
 	u8 *cur_digest = NULL;
 	u32 cur_digestsize = 0;
 	struct inode *inode;
 	int result;

 	memset(&hash, 0, sizeof(hash));

 	if (event_data->violation)	/* recording a violation. */
 		goto out;

 	if (ima_template_hash_algo_allowed(event_data->iint->ima_hash->algo)) {
 		cur_digest = event_data->iint->ima_hash->digest;
 		cur_digestsize = event_data->iint->ima_hash->length;
 		goto out;
 	}

 	if (!event_data->file)	/* missing info to re-calculate the digest */
 		return -EINVAL;

 	inode = file_inode(event_data->file);
 	hash.hdr.algo = ima_template_hash_algo_allowed(ima_hash_algo) ?
 	    ima_hash_algo : HASH_ALGO_SHA1;
 	result = ima_calc_file_hash(event_data->file, &hash.hdr);
 	if (result) {
 		integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode,
 				    event_data->filename, "collect_data",
 				    "failed", result, 0);
 		return result;
 	}
 	cur_digest = hash.hdr.digest;
 	cur_digestsize = hash.hdr.length;
 out:
 	return ima_eventdigest_init_common(cur_digest, cur_digestsize,
 					   HASH_ALGO__LAST, field_data);
 }

 /*
  * This function writes the digest of an event (without size limit).
  */
 int ima_eventdigest_ng_init(struct ima_event_data *event_data,
 			    struct ima_field_data *field_data)
 {
 	u8 *cur_digest = NULL, hash_algo = HASH_ALGO_SHA1;
 	u32 cur_digestsize = 0;

 	if (event_data->violation)	/* recording a violation. */
 		goto out;

 	cur_digest = event_data->iint->ima_hash->digest;
 	cur_digestsize = event_data->iint->ima_hash->length;

 	hash_algo = event_data->iint->ima_hash->algo;
 out:
 	return ima_eventdigest_init_common(cur_digest, cur_digestsize,
 					   hash_algo, field_data);
 }

 static int ima_eventname_init_common(struct ima_event_data *event_data,
 				     struct ima_field_data *field_data,
 				     bool size_limit)
 {
 	const char *cur_filename = NULL;
 	u32 cur_filename_len = 0;

 	BUG_ON(event_data->filename == NULL && event_data->file == NULL);

 	if (event_data->filename) {
 		cur_filename = event_data->filename;
 		cur_filename_len = strlen(event_data->filename);

 		if (!size_limit || cur_filename_len <= IMA_EVENT_NAME_LEN_MAX)
 			goto out;
 	}

 	if (event_data->file) {
 		cur_filename = event_data->file->f_path.dentry->d_name.name;
 		cur_filename_len = strlen(cur_filename);
 	} else
 		/*
 		 * Truncate filename if the latter is too long and
 		 * the file descriptor is not available.
 		 */
 		cur_filename_len = IMA_EVENT_NAME_LEN_MAX;
 out:
 	return ima_write_template_field_data(cur_filename, cur_filename_len,
 					     DATA_FMT_STRING, field_data);
 }

 /*
  * This function writes the name of an event (with size limit).
  */
 int ima_eventname_init(struct ima_event_data *event_data,
 		       struct ima_field_data *field_data)
 {
 	return ima_eventname_init_common(event_data, field_data, true);
 }

 /*
  * This function writes the name of an event (without size limit).
  */
 int ima_eventname_ng_init(struct ima_event_data *event_data,
 			  struct ima_field_data *field_data)
 {
 	return ima_eventname_init_common(event_data, field_data, false);
 }

 /*
  *  ima_eventsig_init - include the file signature as part of the template data
  */
 int ima_eventsig_init(struct ima_event_data *event_data,
 		      struct ima_field_data *field_data)
 {
 	struct evm_ima_xattr_data *xattr_value = event_data->xattr_value;

 	if ((!xattr_value) || (xattr_value->type != EVM_IMA_XATTR_DIGSIG))
 		return 0;

 	return ima_write_template_field_data(xattr_value, event_data->xattr_len,
 					     DATA_FMT_HEX, field_data);
 }

 /*
  *  ima_eventbuf_init - include the buffer(kexec-cmldine) as part of the
  *  template data.
  */
 int ima_eventbuf_init(struct ima_event_data *event_data,
 		      struct ima_field_data *field_data)
 {
 	if ((!event_data->buf) || (event_data->buf_len == 0))
 		return 0;

 	return ima_write_template_field_data(event_data->buf,
 					     event_data->buf_len, DATA_FMT_HEX,
 					     field_data);
 }
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Copyright (C) 2013 Politecnico di Torino, Italy
	* TORSEC group -- http://security.polito.it
	*
	* Author: Roberto Sassu <roberto.sassu@polito.it>
	*
	* File: ima_template_lib.c
	* Library of supported template fields.
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#include "ima_template_lib.h"

	static bool ima_template_hash_algo_allowed(u8 algo)
	{
	if (algo == HASH_ALGO_SHA1 \|\| algo == HASH_ALGO_MD5)
	return true;

	return false;
	}

	enum data_formats {
	DATA_FMT_DIGEST = 0,
	DATA_FMT_DIGEST_WITH_ALGO,
	DATA_FMT_STRING,
	DATA_FMT_HEX
	};

	static int ima_write_template_field_data(const void *data, const u32 datalen,
	enum data_formats datafmt,
	struct ima_field_data *field_data)
	{
	u8 buf, buf_ptr;
	u32 buflen = datalen;

	if (datafmt == DATA_FMT_STRING)
	buflen = datalen + 1;

	buf = kzalloc(buflen, GFP_KERNEL);
	if (!buf)
	return -ENOMEM;

	memcpy(buf, data, datalen);

	/*
	* Replace all space characters with underscore for event names and
	* strings. This avoid that, during the parsing of a measurements list,
	* filenames with spaces or that end with the suffix ' (deleted)' are
	* split into multiple template fields (the space is the delimitator
	* character for measurements lists in ASCII format).
	*/
	if (datafmt == DATA_FMT_STRING) {
	for (buf_ptr = buf; buf_ptr - buf < datalen; buf_ptr++)
	if (*buf_ptr == ' ')
	*buf_ptr = '_';
	}

	field_data->data = buf;
	field_data->len = buflen;
	return 0;
	}

	static void ima_show_template_data_ascii(struct seq_file *m,
	enum ima_show_type show,
	enum data_formats datafmt,
	struct ima_field_data *field_data)
	{
	u8 *buf_ptr = field_data->data;
	u32 buflen = field_data->len;

	switch (datafmt) {
	case DATA_FMT_DIGEST_WITH_ALGO:
	buf_ptr = strnchr(field_data->data, buflen, ':');
	if (buf_ptr != field_data->data)
	seq_printf(m, "%s", field_data->data);

	/* skip ':' and '\0' */
	buf_ptr += 2;
	buflen -= buf_ptr - field_data->data;
	/* fall through */
	case DATA_FMT_DIGEST:
	case DATA_FMT_HEX:
	if (!buflen)
	break;
	ima_print_digest(m, buf_ptr, buflen);
	break;
	case DATA_FMT_STRING:
	seq_printf(m, "%s", buf_ptr);
	break;
	default:
	break;
	}
	}

	static void ima_show_template_data_binary(struct seq_file *m,
	enum ima_show_type show,
	enum data_formats datafmt,
	struct ima_field_data *field_data)
	{
	u32 len = (show == IMA_SHOW_BINARY_OLD_STRING_FMT) ?
	strlen(field_data->data) : field_data->len;

	if (show != IMA_SHOW_BINARY_NO_FIELD_LEN) {
	u32 field_len = !ima_canonical_fmt ? len : cpu_to_le32(len);

	ima_putc(m, &field_len, sizeof(field_len));
	}

	if (!len)
	return;

	ima_putc(m, field_data->data, len);
	}

	static void ima_show_template_field_data(struct seq_file *m,
	enum ima_show_type show,
	enum data_formats datafmt,
	struct ima_field_data *field_data)
	{
	switch (show) {
	case IMA_SHOW_ASCII:
	ima_show_template_data_ascii(m, show, datafmt, field_data);
	break;
	case IMA_SHOW_BINARY:
	case IMA_SHOW_BINARY_NO_FIELD_LEN:
	case IMA_SHOW_BINARY_OLD_STRING_FMT:
	ima_show_template_data_binary(m, show, datafmt, field_data);
	break;
	default:
	break;
	}
	}

	void ima_show_template_digest(struct seq_file *m, enum ima_show_type show,
	struct ima_field_data *field_data)
	{
	ima_show_template_field_data(m, show, DATA_FMT_DIGEST, field_data);
	}

	void ima_show_template_digest_ng(struct seq_file *m, enum ima_show_type show,
	struct ima_field_data *field_data)
	{
	ima_show_template_field_data(m, show, DATA_FMT_DIGEST_WITH_ALGO,
	field_data);
	}

	void ima_show_template_string(struct seq_file *m, enum ima_show_type show,
	struct ima_field_data *field_data)
	{
	ima_show_template_field_data(m, show, DATA_FMT_STRING, field_data);
	}

	void ima_show_template_sig(struct seq_file *m, enum ima_show_type show,
	struct ima_field_data *field_data)
	{
	ima_show_template_field_data(m, show, DATA_FMT_HEX, field_data);
	}

	void ima_show_template_buf(struct seq_file *m, enum ima_show_type show,
	struct ima_field_data *field_data)
	{
	ima_show_template_field_data(m, show, DATA_FMT_HEX, field_data);
	}

	/**
	* ima_parse_buf() - Parses lengths and data from an input buffer
	* @bufstartp: Buffer start address.
	* @bufendp: Buffer end address.
	* @bufcurp: Pointer to remaining (non-parsed) data.
	* @maxfields: Length of fields array.
	* @fields: Array containing lengths and pointers of parsed data.
	* @curfields: Number of array items containing parsed data.
	* @len_mask: Bitmap (if bit is set, data length should not be parsed).
	* @enforce_mask: Check if curfields == maxfields and/or bufcurp == bufendp.
	* @bufname: String identifier of the input buffer.
	*
	* Return: 0 on success, -EINVAL on error.
	*/
	int ima_parse_buf(void bufstartp, void bufendp, void **bufcurp,
	int maxfields, struct ima_field_data fields, int curfields,
	unsigned long len_mask, int enforce_mask, char bufname)
	{
	void *bufp = bufstartp;
	int i;

	for (i = 0; i < maxfields; i++) {
	if (len_mask == NULL \|\| !test_bit(i, len_mask)) {
	if (bufp > (bufendp - sizeof(u32)))
	break;

	fields[i].len = (u32 )bufp;
	if (ima_canonical_fmt)
	fields[i].len = le32_to_cpu(fields[i].len);

	bufp += sizeof(u32);
	}

	if (bufp > (bufendp - fields[i].len))
	break;

	fields[i].data = bufp;
	bufp += fields[i].len;
	}

	if ((enforce_mask & ENFORCE_FIELDS) && i != maxfields) {
	pr_err("%s: nr of fields mismatch: expected: %d, current: %d\n",
	bufname, maxfields, i);
	return -EINVAL;
	}

	if ((enforce_mask & ENFORCE_BUFEND) && bufp != bufendp) {
	pr_err("%s: buf end mismatch: expected: %p, current: %p\n",
	bufname, bufendp, bufp);
	return -EINVAL;
	}

	if (curfields)
	*curfields = i;

	if (bufcurp)
	*bufcurp = bufp;

	return 0;
	}

	static int ima_eventdigest_init_common(u8 *digest, u32 digestsize, u8 hash_algo,
	struct ima_field_data *field_data)
	{
	/*
	* digest formats:
	* - DATA_FMT_DIGEST: digest
	* - DATA_FMT_DIGEST_WITH_ALGO: [<hash algo>] + ':' + '\0' + digest,
	* where <hash algo> is provided if the hash algoritm is not
	* SHA1 or MD5
	*/
	u8 buffer[CRYPTO_MAX_ALG_NAME + 2 + IMA_MAX_DIGEST_SIZE] = { 0 };
	enum data_formats fmt = DATA_FMT_DIGEST;
	u32 offset = 0;

	if (hash_algo < HASH_ALGO__LAST) {
	fmt = DATA_FMT_DIGEST_WITH_ALGO;
	offset += snprintf(buffer, CRYPTO_MAX_ALG_NAME + 1, "%s",
	hash_algo_name[hash_algo]);
	buffer[offset] = ':';
	offset += 2;
	}

	if (digest)
	memcpy(buffer + offset, digest, digestsize);
	else
	/*
	* If digest is NULL, the event being recorded is a violation.
	* Make room for the digest by increasing the offset of
	* IMA_DIGEST_SIZE.
	*/
	offset += IMA_DIGEST_SIZE;

	return ima_write_template_field_data(buffer, offset + digestsize,
	fmt, field_data);
	}

	/*
	* This function writes the digest of an event (with size limit).
	*/
	int ima_eventdigest_init(struct ima_event_data *event_data,
	struct ima_field_data *field_data)
	{
	struct {
	struct ima_digest_data hdr;
	char digest[IMA_MAX_DIGEST_SIZE];
	} hash;
	u8 *cur_digest = NULL;
	u32 cur_digestsize = 0;
	struct inode *inode;
	int result;

	memset(&hash, 0, sizeof(hash));

	if (event_data->violation) /* recording a violation. */
	goto out;

	if (ima_template_hash_algo_allowed(event_data->iint->ima_hash->algo)) {
	cur_digest = event_data->iint->ima_hash->digest;
	cur_digestsize = event_data->iint->ima_hash->length;
	goto out;
	}

	if (!event_data->file) /* missing info to re-calculate the digest */
	return -EINVAL;

	inode = file_inode(event_data->file);
	hash.hdr.algo = ima_template_hash_algo_allowed(ima_hash_algo) ?
	ima_hash_algo : HASH_ALGO_SHA1;
	result = ima_calc_file_hash(event_data->file, &hash.hdr);
	if (result) {
	integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode,
	event_data->filename, "collect_data",
	"failed", result, 0);
	return result;
	}
	cur_digest = hash.hdr.digest;
	cur_digestsize = hash.hdr.length;
	out:
	return ima_eventdigest_init_common(cur_digest, cur_digestsize,
	HASH_ALGO__LAST, field_data);
	}

	/*
	* This function writes the digest of an event (without size limit).
	*/
	int ima_eventdigest_ng_init(struct ima_event_data *event_data,
	struct ima_field_data *field_data)
	{
	u8 *cur_digest = NULL, hash_algo = HASH_ALGO_SHA1;
	u32 cur_digestsize = 0;

	if (event_data->violation) /* recording a violation. */
	goto out;

	cur_digest = event_data->iint->ima_hash->digest;
	cur_digestsize = event_data->iint->ima_hash->length;

	hash_algo = event_data->iint->ima_hash->algo;
	out:
	return ima_eventdigest_init_common(cur_digest, cur_digestsize,
	hash_algo, field_data);
	}

	static int ima_eventname_init_common(struct ima_event_data *event_data,
	struct ima_field_data *field_data,
	bool size_limit)
	{
	const char *cur_filename = NULL;
	u32 cur_filename_len = 0;

	BUG_ON(event_data->filename == NULL && event_data->file == NULL);

	if (event_data->filename) {
	cur_filename = event_data->filename;
	cur_filename_len = strlen(event_data->filename);

	if (!size_limit \|\| cur_filename_len <= IMA_EVENT_NAME_LEN_MAX)
	goto out;
	}

	if (event_data->file) {
	cur_filename = event_data->file->f_path.dentry->d_name.name;
	cur_filename_len = strlen(cur_filename);
	} else
	/*
	* Truncate filename if the latter is too long and
	* the file descriptor is not available.
	*/
	cur_filename_len = IMA_EVENT_NAME_LEN_MAX;
	out:
	return ima_write_template_field_data(cur_filename, cur_filename_len,
	DATA_FMT_STRING, field_data);
	}

	/*
	* This function writes the name of an event (with size limit).
	*/
	int ima_eventname_init(struct ima_event_data *event_data,
	struct ima_field_data *field_data)
	{
	return ima_eventname_init_common(event_data, field_data, true);
	}

	/*
	* This function writes the name of an event (without size limit).
	*/
	int ima_eventname_ng_init(struct ima_event_data *event_data,
	struct ima_field_data *field_data)
	{
	return ima_eventname_init_common(event_data, field_data, false);
	}

	/*
	* ima_eventsig_init - include the file signature as part of the template data
	*/
	int ima_eventsig_init(struct ima_event_data *event_data,
	struct ima_field_data *field_data)
	{
	struct evm_ima_xattr_data *xattr_value = event_data->xattr_value;

	if ((!xattr_value) \|\| (xattr_value->type != EVM_IMA_XATTR_DIGSIG))
	return 0;

	return ima_write_template_field_data(xattr_value, event_data->xattr_len,
	DATA_FMT_HEX, field_data);
	}

	/*
	* ima_eventbuf_init - include the buffer(kexec-cmldine) as part of the
	* template data.
	*/
	int ima_eventbuf_init(struct ima_event_data *event_data,
	struct ima_field_data *field_data)
	{
	if ((!event_data->buf) \|\| (event_data->buf_len == 0))
	return 0;

	return ima_write_template_field_data(event_data->buf,
	event_data->buf_len, DATA_FMT_HEX,
	field_data);
	}