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// SPDX-License-Identifier: GPL-2.0-only
/*
* Ioctl to read verity metadata
*
* Copyright 2021 Google LLC
*/
#include "fsverity_private.h"
#include <linux/uaccess.h>
/**
* 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)
{
struct inode *inode = file_inode(filp);
const struct fsverity_info *vi;
struct fsverity_read_metadata_arg arg;
int length;
void __user *buf;
vi = fsverity_get_info(inode);
if (!vi)
return -ENODATA; /* not a verity file */
/*
* Note that we don't have to explicitly check that the file is open for
* reading, since verity files can only be opened for reading.
*/
if (copy_from_user(&arg, uarg, sizeof(arg)))
return -EFAULT;
if (arg.__reserved)
return -EINVAL;
/* offset + length must not overflow. */
if (arg.offset + arg.length < arg.offset)
return -EINVAL;
/* Ensure that the return value will fit in INT_MAX. */
length = min_t(u64, arg.length, INT_MAX);
buf = u64_to_user_ptr(arg.buf_ptr);
switch (arg.metadata_type) {
default:
return -EINVAL;
}
}
EXPORT_SYMBOL_GPL(fsverity_ioctl_read_metadata);
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