mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Peter Jones](/assets/img/avatar_default.png)
There are no callers except through the file_operations struct below this, so it should be static like everything else here. Signed-off-by: Peter Jones <pjones@redhat.com> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/1462570771-13324-6-git-send-email-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar <mingo@kernel.org>
181 lines
3.8 KiB
C
181 lines
3.8 KiB
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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,
|
|
};
|