Release 4.17 fs/proc/self.c

// 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 = inode->i_sb->s_fs_info;
	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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
66
55.00%
1
16.67%
Al Viro
49
40.83%
4
66.67%
Alexey Dobriyan
5
4.17%
1
16.67%
Total
120
100.00%
6
100.00%


static const struct inode_operations proc_self_inode_operations = {
	.get_link	= proc_self_get_link,
};


static unsigned self_inum __ro_after_init;



int proc_setup_self(struct super_block *s)
{
	struct inode *root_inode = d_inode(s->s_root);
	struct pid_namespace *ns = s->s_fs_info;
	struct dentry *self;
	
	inode_lock(root_inode);
	self = d_alloc_name(s->s_root, "self");
	if (self) {
		struct inode *inode = new_inode_pseudo(s);
		if (inode) {
			inode->i_ino = self_inum;
			inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(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_add(self, inode);
		} else {
			dput(self);
			self = ERR_PTR(-ENOMEM);
		}
	} else {
		self = ERR_PTR(-ENOMEM);
	}
	inode_unlock(root_inode);
	if (IS_ERR(self)) {
		pr_err("proc_fill_super: can't allocate /proc/self\n");
		return PTR_ERR(self);
	}
	ns->proc_self = self;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Al Viro
166
86.46%
2
40.00%
Eric W. Biedermann
19
9.90%
1
20.00%
Deepa Dinamani
4
2.08%
1
20.00%
David Howells
3
1.56%
1
20.00%
Total
192
100.00%
5
100.00%



void __init proc_self_init(void)
{
	proc_alloc_inum(&self_inum);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Al Viro
11
78.57%
1
50.00%
Eric W. Biedermann
3
21.43%
1
50.00%
Total
14
100.00%
2
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Al Viro
237
65.65%
6
46.15%
Eric W. Biedermann
104
28.81%
1
7.69%
Alexey Dobriyan
9
2.49%
2
15.38%
David Howells
6
1.66%
2
15.38%
Deepa Dinamani
4
1.11%
1
7.69%
Greg Kroah-Hartman
1
0.28%
1
7.69%
Total
361
100.00%
13
100.00%
Directory: fs/proc

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