#include #include #include #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); /* 11 for max length of signed int in decimal + NULL term */ name = kmalloc(12, dentry ? GFP_KERNEL : GFP_ATOMIC); if (unlikely(!name)) return dentry ? ERR_PTR(-ENOMEM) : ERR_PTR(-ECHILD); sprintf(name, "%d", 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, }; static unsigned self_inum; 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; } void __init proc_self_init(void) { proc_alloc_inum(&self_inum); } .git/tree/net/ipv4/fib_frontend.c?id=628f07d33c1f2e7bf31e0a4a988bb07914bd5e73'>treecommitdiff
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