mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
549c729771
Extend some inode methods with an additional user namespace argument. A filesystem that is aware of idmapped mounts will receive the user namespace the mount has been marked with. This can be used for additional permission checking and also to enable filesystems to translate between uids and gids if they need to. We have implemented all relevant helpers in earlier patches. As requested we simply extend the exisiting inode method instead of introducing new ones. This is a little more code churn but it's mostly mechanical and doesnt't leave us with additional inode methods. Link: https://lore.kernel.org/r/20210121131959.646623-25-christian.brauner@ubuntu.com Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
151 lines
3.2 KiB
C
151 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/xattr.h>
|
|
#include <linux/posix_acl.h>
|
|
#include <linux/posix_acl_xattr.h>
|
|
#include <linux/gfs2_ondisk.h>
|
|
|
|
#include "gfs2.h"
|
|
#include "incore.h"
|
|
#include "acl.h"
|
|
#include "xattr.h"
|
|
#include "glock.h"
|
|
#include "inode.h"
|
|
#include "meta_io.h"
|
|
#include "quota.h"
|
|
#include "rgrp.h"
|
|
#include "trans.h"
|
|
#include "util.h"
|
|
|
|
static const char *gfs2_acl_name(int type)
|
|
{
|
|
switch (type) {
|
|
case ACL_TYPE_ACCESS:
|
|
return XATTR_POSIX_ACL_ACCESS;
|
|
case ACL_TYPE_DEFAULT:
|
|
return XATTR_POSIX_ACL_DEFAULT;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct posix_acl *acl;
|
|
const char *name;
|
|
char *data;
|
|
int len;
|
|
|
|
if (!ip->i_eattr)
|
|
return NULL;
|
|
|
|
name = gfs2_acl_name(type);
|
|
len = gfs2_xattr_acl_get(ip, name, &data);
|
|
if (len <= 0)
|
|
return ERR_PTR(len);
|
|
acl = posix_acl_from_xattr(&init_user_ns, data, len);
|
|
kfree(data);
|
|
return acl;
|
|
}
|
|
|
|
struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_holder gh;
|
|
bool need_unlock = false;
|
|
struct posix_acl *acl;
|
|
|
|
if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
|
|
int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
|
|
LM_FLAG_ANY, &gh);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
need_unlock = true;
|
|
}
|
|
acl = __gfs2_get_acl(inode, type);
|
|
if (need_unlock)
|
|
gfs2_glock_dq_uninit(&gh);
|
|
return acl;
|
|
}
|
|
|
|
int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
|
|
{
|
|
int error;
|
|
size_t len;
|
|
char *data;
|
|
const char *name = gfs2_acl_name(type);
|
|
|
|
if (acl) {
|
|
len = posix_acl_xattr_size(acl->a_count);
|
|
data = kmalloc(len, GFP_NOFS);
|
|
if (data == NULL)
|
|
return -ENOMEM;
|
|
error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
|
|
if (error < 0)
|
|
goto out;
|
|
} else {
|
|
data = NULL;
|
|
len = 0;
|
|
}
|
|
|
|
error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
|
|
if (error)
|
|
goto out;
|
|
set_cached_acl(inode, type, acl);
|
|
out:
|
|
kfree(data);
|
|
return error;
|
|
}
|
|
|
|
int gfs2_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
|
|
struct posix_acl *acl, int type)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_holder gh;
|
|
bool need_unlock = false;
|
|
int ret;
|
|
umode_t mode;
|
|
|
|
if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
|
|
return -E2BIG;
|
|
|
|
ret = gfs2_qa_get(ip);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
|
|
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
|
|
if (ret)
|
|
goto out;
|
|
need_unlock = true;
|
|
}
|
|
|
|
mode = inode->i_mode;
|
|
if (type == ACL_TYPE_ACCESS && acl) {
|
|
ret = posix_acl_update_mode(&init_user_ns, inode, &mode, &acl);
|
|
if (ret)
|
|
goto unlock;
|
|
}
|
|
|
|
ret = __gfs2_set_acl(inode, acl, type);
|
|
if (!ret && mode != inode->i_mode) {
|
|
inode->i_ctime = current_time(inode);
|
|
inode->i_mode = mode;
|
|
mark_inode_dirty(inode);
|
|
}
|
|
unlock:
|
|
if (need_unlock)
|
|
gfs2_glock_dq_uninit(&gh);
|
|
out:
|
|
gfs2_qa_put(ip);
|
|
return ret;
|
|
}
|