forked from mirrors/linux
c3d96f690a
Provide a CONFIG_PROC_FS=n fallback for proc_create_net_single_write().
Also provide a fallback for proc_create_net_data_write().
Fixes: 564def7176 ("proc: Add a way to make network proc files writable")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
cc: netdev@vger.kernel.org
243 lines
8.9 KiB
C
243 lines
8.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* The proc filesystem constants/structures
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*/
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#ifndef _LINUX_PROC_FS_H
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#define _LINUX_PROC_FS_H
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#include <linux/compiler.h>
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#include <linux/types.h>
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#include <linux/fs.h>
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struct proc_dir_entry;
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struct seq_file;
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struct seq_operations;
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enum {
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/*
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* All /proc entries using this ->proc_ops instance are never removed.
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*
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* If in doubt, ignore this flag.
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*/
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#ifdef MODULE
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PROC_ENTRY_PERMANENT = 0U,
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#else
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PROC_ENTRY_PERMANENT = 1U << 0,
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#endif
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};
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struct proc_ops {
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unsigned int proc_flags;
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int (*proc_open)(struct inode *, struct file *);
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ssize_t (*proc_read)(struct file *, char __user *, size_t, loff_t *);
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ssize_t (*proc_read_iter)(struct kiocb *, struct iov_iter *);
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ssize_t (*proc_write)(struct file *, const char __user *, size_t, loff_t *);
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/* mandatory unless nonseekable_open() or equivalent is used */
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loff_t (*proc_lseek)(struct file *, loff_t, int);
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int (*proc_release)(struct inode *, struct file *);
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__poll_t (*proc_poll)(struct file *, struct poll_table_struct *);
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long (*proc_ioctl)(struct file *, unsigned int, unsigned long);
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#ifdef CONFIG_COMPAT
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long (*proc_compat_ioctl)(struct file *, unsigned int, unsigned long);
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#endif
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int (*proc_mmap)(struct file *, struct vm_area_struct *);
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unsigned long (*proc_get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
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} __randomize_layout;
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/* definitions for hide_pid field */
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enum proc_hidepid {
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HIDEPID_OFF = 0,
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HIDEPID_NO_ACCESS = 1,
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HIDEPID_INVISIBLE = 2,
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HIDEPID_NOT_PTRACEABLE = 4, /* Limit pids to only ptraceable pids */
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};
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/* definitions for proc mount option pidonly */
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enum proc_pidonly {
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PROC_PIDONLY_OFF = 0,
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PROC_PIDONLY_ON = 1,
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};
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struct proc_fs_info {
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struct pid_namespace *pid_ns;
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struct dentry *proc_self; /* For /proc/self */
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struct dentry *proc_thread_self; /* For /proc/thread-self */
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kgid_t pid_gid;
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enum proc_hidepid hide_pid;
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enum proc_pidonly pidonly;
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};
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static inline struct proc_fs_info *proc_sb_info(struct super_block *sb)
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{
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return sb->s_fs_info;
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}
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#ifdef CONFIG_PROC_FS
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typedef int (*proc_write_t)(struct file *, char *, size_t);
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extern void proc_root_init(void);
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extern void proc_flush_pid(struct pid *);
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extern struct proc_dir_entry *proc_symlink(const char *,
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struct proc_dir_entry *, const char *);
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struct proc_dir_entry *_proc_mkdir(const char *, umode_t, struct proc_dir_entry *, void *, bool);
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extern struct proc_dir_entry *proc_mkdir(const char *, struct proc_dir_entry *);
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extern struct proc_dir_entry *proc_mkdir_data(const char *, umode_t,
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struct proc_dir_entry *, void *);
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extern struct proc_dir_entry *proc_mkdir_mode(const char *, umode_t,
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struct proc_dir_entry *);
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struct proc_dir_entry *proc_create_mount_point(const char *name);
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struct proc_dir_entry *proc_create_seq_private(const char *name, umode_t mode,
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struct proc_dir_entry *parent, const struct seq_operations *ops,
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unsigned int state_size, void *data);
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#define proc_create_seq_data(name, mode, parent, ops, data) \
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proc_create_seq_private(name, mode, parent, ops, 0, data)
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#define proc_create_seq(name, mode, parent, ops) \
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proc_create_seq_private(name, mode, parent, ops, 0, NULL)
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struct proc_dir_entry *proc_create_single_data(const char *name, umode_t mode,
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struct proc_dir_entry *parent,
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int (*show)(struct seq_file *, void *), void *data);
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#define proc_create_single(name, mode, parent, show) \
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proc_create_single_data(name, mode, parent, show, NULL)
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extern struct proc_dir_entry *proc_create_data(const char *, umode_t,
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struct proc_dir_entry *,
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const struct proc_ops *,
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void *);
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struct proc_dir_entry *proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent, const struct proc_ops *proc_ops);
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extern void proc_set_size(struct proc_dir_entry *, loff_t);
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extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t);
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/*
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* Obtain the private data passed by user through proc_create_data() or
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* related.
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*/
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static inline void *pde_data(const struct inode *inode)
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{
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return inode->i_private;
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}
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extern void *proc_get_parent_data(const struct inode *);
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extern void proc_remove(struct proc_dir_entry *);
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extern void remove_proc_entry(const char *, struct proc_dir_entry *);
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extern int remove_proc_subtree(const char *, struct proc_dir_entry *);
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struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode,
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struct proc_dir_entry *parent, const struct seq_operations *ops,
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unsigned int state_size, void *data);
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#define proc_create_net(name, mode, parent, ops, state_size) \
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proc_create_net_data(name, mode, parent, ops, state_size, NULL)
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struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode,
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struct proc_dir_entry *parent,
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int (*show)(struct seq_file *, void *), void *data);
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struct proc_dir_entry *proc_create_net_data_write(const char *name, umode_t mode,
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struct proc_dir_entry *parent,
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const struct seq_operations *ops,
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proc_write_t write,
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unsigned int state_size, void *data);
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struct proc_dir_entry *proc_create_net_single_write(const char *name, umode_t mode,
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struct proc_dir_entry *parent,
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int (*show)(struct seq_file *, void *),
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proc_write_t write,
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void *data);
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extern struct pid *tgid_pidfd_to_pid(const struct file *file);
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struct bpf_iter_aux_info;
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extern int bpf_iter_init_seq_net(void *priv_data, struct bpf_iter_aux_info *aux);
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extern void bpf_iter_fini_seq_net(void *priv_data);
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#ifdef CONFIG_PROC_PID_ARCH_STATUS
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/*
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* The architecture which selects CONFIG_PROC_PID_ARCH_STATUS must
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* provide proc_pid_arch_status() definition.
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*/
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int proc_pid_arch_status(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *task);
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#endif /* CONFIG_PROC_PID_ARCH_STATUS */
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#else /* CONFIG_PROC_FS */
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static inline void proc_root_init(void)
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{
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}
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static inline void proc_flush_pid(struct pid *pid)
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{
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}
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static inline struct proc_dir_entry *proc_symlink(const char *name,
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struct proc_dir_entry *parent,const char *dest) { return NULL;}
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static inline struct proc_dir_entry *proc_mkdir(const char *name,
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struct proc_dir_entry *parent) {return NULL;}
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static inline struct proc_dir_entry *proc_create_mount_point(const char *name) { return NULL; }
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static inline struct proc_dir_entry *_proc_mkdir(const char *name, umode_t mode,
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struct proc_dir_entry *parent, void *data, bool force_lookup)
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{
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return NULL;
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}
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static inline struct proc_dir_entry *proc_mkdir_data(const char *name,
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umode_t mode, struct proc_dir_entry *parent, void *data) { return NULL; }
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static inline struct proc_dir_entry *proc_mkdir_mode(const char *name,
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umode_t mode, struct proc_dir_entry *parent) { return NULL; }
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#define proc_create_seq_private(name, mode, parent, ops, size, data) ({NULL;})
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#define proc_create_seq_data(name, mode, parent, ops, data) ({NULL;})
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#define proc_create_seq(name, mode, parent, ops) ({NULL;})
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#define proc_create_single(name, mode, parent, show) ({NULL;})
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#define proc_create_single_data(name, mode, parent, show, data) ({NULL;})
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static inline struct proc_dir_entry *
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proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent,
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const struct proc_ops *proc_ops)
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{ return NULL; }
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static inline struct proc_dir_entry *
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proc_create_data(const char *name, umode_t mode, struct proc_dir_entry *parent,
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const struct proc_ops *proc_ops, void *data)
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{ return NULL; }
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static inline void proc_set_size(struct proc_dir_entry *de, loff_t size) {}
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static inline void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) {}
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static inline void *pde_data(const struct inode *inode) {BUG(); return NULL;}
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static inline void *proc_get_parent_data(const struct inode *inode) { BUG(); return NULL; }
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static inline void proc_remove(struct proc_dir_entry *de) {}
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#define remove_proc_entry(name, parent) do {} while (0)
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static inline int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) { return 0; }
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#define proc_create_net_data(name, mode, parent, ops, state_size, data) ({NULL;})
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#define proc_create_net_data_write(name, mode, parent, ops, write, state_size, data) ({NULL;})
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#define proc_create_net(name, mode, parent, state_size, ops) ({NULL;})
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#define proc_create_net_single(name, mode, parent, show, data) ({NULL;})
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#define proc_create_net_single_write(name, mode, parent, show, write, data) ({NULL;})
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static inline struct pid *tgid_pidfd_to_pid(const struct file *file)
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{
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return ERR_PTR(-EBADF);
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}
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#endif /* CONFIG_PROC_FS */
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struct net;
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static inline struct proc_dir_entry *proc_net_mkdir(
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struct net *net, const char *name, struct proc_dir_entry *parent)
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{
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return _proc_mkdir(name, 0, parent, net, true);
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}
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struct ns_common;
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int open_related_ns(struct ns_common *ns,
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struct ns_common *(*get_ns)(struct ns_common *ns));
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/* get the associated pid namespace for a file in procfs */
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static inline struct pid_namespace *proc_pid_ns(struct super_block *sb)
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{
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return proc_sb_info(sb)->pid_ns;
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}
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bool proc_ns_file(const struct file *file);
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#endif /* _LINUX_PROC_FS_H */
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