linux/fs/verity/read_metadata.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Ioctl to read verity metadata
 *
 * Copyright 2021 Google LLC
 */

#include "fsverity_private.h"

#include <linux/backing-dev.h>
#include <linux/highmem.h>
#include <linux/sched/signal.h>
#include <linux/uaccess.h>

static int fsverity_read_merkle_tree(struct inode *inode,
				     const struct fsverity_info *vi,
				     void __user *buf, u64 offset, int length)
{ … }

/* Copy the requested portion of the buffer to userspace. */
static int fsverity_read_buffer(void __user *dst, u64 offset, int length,
				const void *src, size_t src_length)
{ … }

static int fsverity_read_descriptor(struct inode *inode,
				    void __user *buf, u64 offset, int length)
{ … }

static int fsverity_read_signature(struct inode *inode,
				   void __user *buf, u64 offset, int length)
{ … }

/**
 * fsverity_ioctl_read_metadata() - read verity metadata from a file
 * @filp: file to read the metadata from
 * @uarg: user pointer to fsverity_read_metadata_arg
 *
 * Return: length read on success, 0 on EOF, -errno on failure
 */
int fsverity_ioctl_read_metadata(struct file *filp, const void __user *uarg)
{ … }
EXPORT_SYMBOL_GPL(…);