From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- fs/proc/self.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 fs/proc/self.c (limited to 'fs/proc/self.c') diff --git a/fs/proc/self.c b/fs/proc/self.c new file mode 100644 index 000000000..72cd69bca --- /dev/null +++ b/fs/proc/self.c @@ -0,0 +1,73 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#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 = 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, +}; + +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 proc_fs_info *fs_info = proc_sb_info(s); + struct dentry *self; + int ret = -ENOMEM; + + inode_lock(root_inode); + self = d_alloc_name(s->s_root, "self"); + if (self) { + struct inode *inode = new_inode(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); + ret = 0; + } else { + dput(self); + } + } + inode_unlock(root_inode); + + if (ret) + pr_err("proc_fill_super: can't allocate /proc/self\n"); + else + fs_info->proc_self = self; + + return ret; +} + +void __init proc_self_init(void) +{ + proc_alloc_inum(&self_inum); +} -- cgit v1.2.3