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eaa0d190bf
pid_ns_for_children set by a task is known only to the task itself, and it's impossible to identify it from outside. It's a big problem for checkpoint/restore software like CRIU, because it can't correctly handle tasks, that do setns(CLONE_NEWPID) in proccess of their work. This patch solves the problem, and it exposes pid_ns_for_children to ns directory in standard way with the name "pid_for_children": ~# ls /proc/5531/ns -l | grep pid lrwxrwxrwx 1 root root 0 Jan 14 16:38 pid -> pid:[4026531836] lrwxrwxrwx 1 root root 0 Jan 14 16:38 pid_for_children -> pid:[4026532286] Link: http://lkml.kernel.org/r/149201123914.6007.2187327078064239572.stgit@localhost.localdomain Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Cc: Andrei Vagin <avagin@virtuozzo.com> Cc: Andreas Gruenbacher <agruenba@redhat.com> Cc: Kees Cook <keescook@chromium.org> Cc: Michael Kerrisk <mtk.manpages@googlemail.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paul Moore <paul@paul-moore.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Ingo Molnar <mingo@kernel.org> Cc: Serge Hallyn <serge@hallyn.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
/*
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* procfs namespace bits
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*/
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#ifndef _LINUX_PROC_NS_H
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#define _LINUX_PROC_NS_H
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#include <linux/ns_common.h>
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struct pid_namespace;
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struct nsproxy;
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struct path;
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struct task_struct;
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struct inode;
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struct proc_ns_operations {
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const char *name;
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const char *real_ns_name;
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int type;
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struct ns_common *(*get)(struct task_struct *task);
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void (*put)(struct ns_common *ns);
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int (*install)(struct nsproxy *nsproxy, struct ns_common *ns);
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struct user_namespace *(*owner)(struct ns_common *ns);
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struct ns_common *(*get_parent)(struct ns_common *ns);
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};
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extern const struct proc_ns_operations netns_operations;
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extern const struct proc_ns_operations utsns_operations;
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extern const struct proc_ns_operations ipcns_operations;
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extern const struct proc_ns_operations pidns_operations;
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extern const struct proc_ns_operations pidns_for_children_operations;
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extern const struct proc_ns_operations userns_operations;
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extern const struct proc_ns_operations mntns_operations;
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extern const struct proc_ns_operations cgroupns_operations;
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/*
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* We always define these enumerators
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*/
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enum {
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PROC_ROOT_INO = 1,
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PROC_IPC_INIT_INO = 0xEFFFFFFFU,
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PROC_UTS_INIT_INO = 0xEFFFFFFEU,
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PROC_USER_INIT_INO = 0xEFFFFFFDU,
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PROC_PID_INIT_INO = 0xEFFFFFFCU,
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PROC_CGROUP_INIT_INO = 0xEFFFFFFBU,
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};
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#ifdef CONFIG_PROC_FS
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extern int pid_ns_prepare_proc(struct pid_namespace *ns);
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extern void pid_ns_release_proc(struct pid_namespace *ns);
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extern int proc_alloc_inum(unsigned int *pino);
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extern void proc_free_inum(unsigned int inum);
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#else /* CONFIG_PROC_FS */
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static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; }
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static inline void pid_ns_release_proc(struct pid_namespace *ns) {}
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static inline int proc_alloc_inum(unsigned int *inum)
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{
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*inum = 1;
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return 0;
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}
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static inline void proc_free_inum(unsigned int inum) {}
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#endif /* CONFIG_PROC_FS */
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static inline int ns_alloc_inum(struct ns_common *ns)
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{
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atomic_long_set(&ns->stashed, 0);
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return proc_alloc_inum(&ns->inum);
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}
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#define ns_free_inum(ns) proc_free_inum((ns)->inum)
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extern struct file *proc_ns_fget(int fd);
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#define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
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extern void *ns_get_path(struct path *path, struct task_struct *task,
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const struct proc_ns_operations *ns_ops);
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extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
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const struct proc_ns_operations *ns_ops);
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extern void nsfs_init(void);
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#endif /* _LINUX_PROC_NS_H */
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