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32 results

f_fs.c

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  • thread_self.c 1.89 KiB
    // SPDX-License-Identifier: GPL-2.0
    #include <linux/sched.h>
    #include <linux/slab.h>
    #include <linux/pid_namespace.h>
    #include "internal.h"
    
    /*
     * /proc/thread_self:
     */
    static const char *proc_thread_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);
    	pid_t pid = task_pid_nr_ns(current, ns);
    	char *name;
    
    	if (!pid)
    		return ERR_PTR(-ENOENT);
    	name = kmalloc(10 + 6 + 10 + 1, dentry ? GFP_KERNEL : GFP_ATOMIC);
    	if (unlikely(!name))
    		return dentry ? ERR_PTR(-ENOMEM) : ERR_PTR(-ECHILD);
    	sprintf(name, "%u/task/%u", tgid, pid);
    	set_delayed_call(done, kfree_link, name);
    	return name;
    }
    
    static const struct inode_operations proc_thread_self_inode_operations = {
    	.get_link	= proc_thread_self_get_link,
    };
    
    static unsigned thread_self_inum;
    
    int proc_setup_thread_self(struct super_block *s)
    {
    	struct inode *root_inode = d_inode(s->s_root);
    	struct pid_namespace *ns = s->s_fs_info;
    	struct dentry *thread_self;
    
    	inode_lock(root_inode);
    	thread_self = d_alloc_name(s->s_root, "thread-self");
    	if (thread_self) {
    		struct inode *inode = new_inode_pseudo(s);
    		if (inode) {
    			inode->i_ino = thread_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_thread_self_inode_operations;
    			d_add(thread_self, inode);
    		} else {
    			dput(thread_self);
    			thread_self = ERR_PTR(-ENOMEM);
    		}
    	} else {
    		thread_self = ERR_PTR(-ENOMEM);
    	}
    	inode_unlock(root_inode);
    	if (IS_ERR(thread_self)) {
    		pr_err("proc_fill_super: can't allocate /proc/thread_self\n");
    		return PTR_ERR(thread_self);
    	}
    	ns->proc_thread_self = thread_self;
    	return 0;
    }
    
    void __init proc_thread_self_init(void)
    {
    	proc_alloc_inum(&thread_self_inum);
    }