mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
db4aad209b
Once created, a kernfs_node is always destroyed by kernfs_put().
Since ba7443bc65 ("sysfs, kernfs: implement
kernfs_create/destroy_root()"), kernfs_put() depends on kernfs_root()
to locate the ino_ida. kernfs_root() in turn depends on
kernfs_node->parent being set for !dir nodes. This means that
kernfs_put() of a !dir node requires its ->parent to be initialized.
This leads to oops when a newly created !dir node is destroyed without
going through kernfs_add_one() or after failing kernfs_add_one()
before ->parent is set. kernfs_root() invoked from kernfs_put() will
try to dereference NULL parent.
Fix it by moving parent association to kernfs_new_node() from
kernfs_add_one(). kernfs_new_node() now takes @parent instead of
@root and determines the root from the parent and also sets the new
node's parent properly. @parent parameter is removed from
kernfs_add_one(). As there's no parent when creating the root node,
__kernfs_new_node() which takes @root as before and doesn't set the
parent is used in that case.
This ensures that a kernfs_node in any stage in its life has its
parent associated and thus can be put.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
/*
|
|
* fs/kernfs/kernfs-internal.h - kernfs internal header file
|
|
*
|
|
* Copyright (c) 2001-3 Patrick Mochel
|
|
* Copyright (c) 2007 SUSE Linux Products GmbH
|
|
* Copyright (c) 2007, 2013 Tejun Heo <teheo@suse.de>
|
|
*
|
|
* This file is released under the GPLv2.
|
|
*/
|
|
|
|
#ifndef __KERNFS_INTERNAL_H
|
|
#define __KERNFS_INTERNAL_H
|
|
|
|
#include <linux/lockdep.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/xattr.h>
|
|
|
|
#include <linux/kernfs.h>
|
|
|
|
struct kernfs_iattrs {
|
|
struct iattr ia_iattr;
|
|
void *ia_secdata;
|
|
u32 ia_secdata_len;
|
|
|
|
struct simple_xattrs xattrs;
|
|
};
|
|
|
|
#define KN_DEACTIVATED_BIAS INT_MIN
|
|
|
|
/* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */
|
|
|
|
/**
|
|
* kernfs_root - find out the kernfs_root a kernfs_node belongs to
|
|
* @kn: kernfs_node of interest
|
|
*
|
|
* Return the kernfs_root @kn belongs to.
|
|
*/
|
|
static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn)
|
|
{
|
|
/* if parent exists, it's always a dir; otherwise, @sd is a dir */
|
|
if (kn->parent)
|
|
kn = kn->parent;
|
|
return kn->dir.root;
|
|
}
|
|
|
|
/*
|
|
* Context structure to be used while adding/removing nodes.
|
|
*/
|
|
struct kernfs_addrm_cxt {
|
|
struct kernfs_node *removed;
|
|
};
|
|
|
|
/*
|
|
* mount.c
|
|
*/
|
|
struct kernfs_super_info {
|
|
/*
|
|
* The root associated with this super_block. Each super_block is
|
|
* identified by the root and ns it's associated with.
|
|
*/
|
|
struct kernfs_root *root;
|
|
|
|
/*
|
|
* Each sb is associated with one namespace tag, currently the
|
|
* network namespace of the task which mounted this kernfs
|
|
* instance. If multiple tags become necessary, make the following
|
|
* an array and compare kernfs_node tag against every entry.
|
|
*/
|
|
const void *ns;
|
|
};
|
|
#define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info))
|
|
|
|
extern struct kmem_cache *kernfs_node_cache;
|
|
|
|
/*
|
|
* inode.c
|
|
*/
|
|
struct inode *kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn);
|
|
void kernfs_evict_inode(struct inode *inode);
|
|
int kernfs_iop_permission(struct inode *inode, int mask);
|
|
int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
|
|
int kernfs_iop_getattr(struct vfsmount *mnt, struct dentry *dentry,
|
|
struct kstat *stat);
|
|
int kernfs_iop_setxattr(struct dentry *dentry, const char *name, const void *value,
|
|
size_t size, int flags);
|
|
int kernfs_iop_removexattr(struct dentry *dentry, const char *name);
|
|
ssize_t kernfs_iop_getxattr(struct dentry *dentry, const char *name, void *buf,
|
|
size_t size);
|
|
ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
|
|
void kernfs_inode_init(void);
|
|
|
|
/*
|
|
* dir.c
|
|
*/
|
|
extern struct mutex kernfs_mutex;
|
|
extern const struct dentry_operations kernfs_dops;
|
|
extern const struct file_operations kernfs_dir_fops;
|
|
extern const struct inode_operations kernfs_dir_iops;
|
|
|
|
struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
|
|
void kernfs_put_active(struct kernfs_node *kn);
|
|
void kernfs_addrm_start(struct kernfs_addrm_cxt *acxt);
|
|
int kernfs_add_one(struct kernfs_addrm_cxt *acxt, struct kernfs_node *kn);
|
|
void kernfs_addrm_finish(struct kernfs_addrm_cxt *acxt);
|
|
struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
|
|
const char *name, umode_t mode,
|
|
unsigned flags);
|
|
|
|
/*
|
|
* file.c
|
|
*/
|
|
extern const struct file_operations kernfs_file_fops;
|
|
|
|
void kernfs_unmap_bin_file(struct kernfs_node *kn);
|
|
|
|
/*
|
|
* symlink.c
|
|
*/
|
|
extern const struct inode_operations kernfs_symlink_iops;
|
|
|
|
#endif /* __KERNFS_INTERNAL_H */
|