Release 4.10 fs/efivarfs/file.c
/*
* Copyright (C) 2012 Red Hat, Inc.
* Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/efi.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/mount.h>
#include "internal.h"
static ssize_t efivarfs_file_write(struct file *file,
const char __user *userbuf, size_t count, loff_t *ppos)
{
struct efivar_entry *var = file->private_data;
void *data;
u32 attributes;
struct inode *inode = file->f_mapping->host;
unsigned long datasize = count - sizeof(attributes);
ssize_t bytes;
bool set = false;
if (count < sizeof(attributes))
return -EINVAL;
if (copy_from_user(&attributes, userbuf, sizeof(attributes)))
return -EFAULT;
if (attributes & ~(EFI_VARIABLE_MASK))
return -EINVAL;
data = memdup_user(userbuf + sizeof(attributes), datasize);
if (IS_ERR(data))
return PTR_ERR(data);
bytes = efivar_entry_set_get_size(var, attributes, &datasize,
data, &set);
if (!set && bytes) {
if (bytes == -ENOENT)
bytes = -EIO;
goto out;
}
if (bytes == -ENOENT) {
drop_nlink(inode);
d_delete(file->f_path.dentry);
dput(file->f_path.dentry);
} else {
inode_lock(inode);
i_size_write(inode, datasize + sizeof(attributes));
inode_unlock(inode);
}
bytes = count;
out:
kfree(data);
return bytes;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| matt fleming | matt fleming | 219 | 86.22% | 1 | 20.00% |
| lingzhu xiang | lingzhu xiang | 14 | 5.51% | 1 | 20.00% |
| geyslan g. bem | geyslan g. bem | 13 | 5.12% | 1 | 20.00% |
| al viro | al viro | 8 | 3.15% | 2 | 40.00% |
| Total | 254 | 100.00% | 5 | 100.00% |
static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct efivar_entry *var = file->private_data;
unsigned long datasize = 0;
u32 attributes;
void *data;
ssize_t size = 0;
int err;
err = efivar_entry_size(var, &datasize);
/*
* efivarfs represents uncommitted variables with
* zero-length files. Reading them should return EOF.
*/
if (err == -ENOENT)
return 0;
else if (err)
return err;
data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL);
if (!data)
return -ENOMEM;
size = efivar_entry_get(var, &attributes, &datasize,
data + sizeof(attributes));
if (size)
goto out_free;
memcpy(data, &attributes, sizeof(attributes));
size = simple_read_from_buffer(userbuf, count, ppos,
data, datasize + sizeof(attributes));
out_free:
kfree(data);
return size;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| matt fleming | matt fleming | 163 | 93.14% | 1 | 50.00% |
| lingzhu xiang | lingzhu xiang | 12 | 6.86% | 1 | 50.00% |
| Total | 175 | 100.00% | 2 | 100.00% |
static int
efivarfs_ioc_getxflags(struct file *file, void __user *arg)
{
struct inode *inode = file->f_mapping->host;
unsigned int i_flags;
unsigned int flags = 0;
i_flags = inode->i_flags;
if (i_flags & S_IMMUTABLE)
flags |= FS_IMMUTABLE_FL;
if (copy_to_user(arg, &flags, sizeof(flags)))
return -EFAULT;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| peter jones | peter jones | 75 | 100.00% | 1 | 100.00% |
| Total | 75 | 100.00% | 1 | 100.00% |
static int
efivarfs_ioc_setxflags(struct file *file, void __user *arg)
{
struct inode *inode = file->f_mapping->host;
unsigned int flags;
unsigned int i_flags = 0;
int error;
if (!inode_owner_or_capable(inode))
return -EACCES;
if (copy_from_user(&flags, arg, sizeof(flags)))
return -EFAULT;
if (flags & ~FS_IMMUTABLE_FL)
return -EOPNOTSUPP;
if (!capable(CAP_LINUX_IMMUTABLE))
return -EPERM;
if (flags & FS_IMMUTABLE_FL)
i_flags |= S_IMMUTABLE;
error = mnt_want_write_file(file);
if (error)
return error;
inode_lock(inode);
inode_set_flags(inode, i_flags, S_IMMUTABLE);
inode_unlock(inode);
mnt_drop_write_file(file);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| peter jones | peter jones | 145 | 100.00% | 1 | 100.00% |
| Total | 145 | 100.00% | 1 | 100.00% |
static long
efivarfs_file_ioctl(struct file *file, unsigned int cmd, unsigned long p)
{
void __user *arg = (void __user *)p;
switch (cmd) {
case FS_IOC_GETFLAGS:
return efivarfs_ioc_getxflags(file, arg);
case FS_IOC_SETFLAGS:
return efivarfs_ioc_setxflags(file, arg);
}
return -ENOTTY;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| peter jones | peter jones | 63 | 100.00% | 2 | 100.00% |
| Total | 63 | 100.00% | 2 | 100.00% |
const struct file_operations efivarfs_file_operations = {
.open = simple_open,
.read = efivarfs_file_read,
.write = efivarfs_file_write,
.llseek = no_llseek,
.unlocked_ioctl = efivarfs_file_ioctl,
};
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| matt fleming | matt fleming | 418 | 55.00% | 1 | 11.11% |
| peter jones | peter jones | 291 | 38.29% | 2 | 22.22% |
| lingzhu xiang | lingzhu xiang | 26 | 3.42% | 1 | 11.11% |
| geyslan g. bem | geyslan g. bem | 13 | 1.71% | 1 | 11.11% |
| al viro | al viro | 8 | 1.05% | 2 | 22.22% |
| linus torvalds | linus torvalds | 3 | 0.39% | 1 | 11.11% |
| h. peter anvin | h. peter anvin | 1 | 0.13% | 1 | 11.11% |
| Total | 760 | 100.00% | 9 | 100.00% |
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