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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667// SPDX-License-Identifier: GPL-2.0#include <linux/cache.h>#include <linux/sched.h>#include <linux/slab.h>#include <linux/pid_namespace.h>#include "internal.h"
/* * /proc/self: */static const char *proc_self_get_link(struct dentry *dentry, struct inode *inode, struct delayed_call *done){ struct pid_namespace *ns = proc_pid_ns(inode->i_sb); pid_t tgid = task_tgid_nr_ns(current, ns); char *name;
if (!tgid) return ERR_PTR(-ENOENT); /* max length of unsigned int in decimal + NULL term */ name = kmalloc(10 + 1, dentry ? GFP_KERNEL : GFP_ATOMIC); if (unlikely(!name)) return dentry ? ERR_PTR(-ENOMEM) : ERR_PTR(-ECHILD); sprintf(name, "%u", tgid); set_delayed_call(done, kfree_link, name); return name;}
static const struct inode_operations proc_self_inode_operations = { .get_link = proc_self_get_link,};
unsigned self_inum __ro_after_init;
int proc_setup_self(struct super_block *s){ struct dentry *self; int ret = -ENOMEM;
self = d_alloc_name(s->s_root, "self"); if (self) { struct inode *inode = new_inode(s); if (inode) { inode->i_ino = self_inum; simple_inode_init_ts(inode); inode->i_mode = S_IFLNK | S_IRWXUGO; inode->i_uid = GLOBAL_ROOT_UID; inode->i_gid = GLOBAL_ROOT_GID; inode->i_op = &proc_self_inode_operations; d_make_persistent(self, inode); ret = 0; } dput(self); }
if (ret) pr_err("proc_fill_super: can't allocate /proc/self\n");
return ret;}
void __init proc_self_init(void){ proc_alloc_inum(&self_inum);}