Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-09-20 15:03:04 +00:00
Code Issues Packages Projects Releases Wiki Activity

proc: block mounting on top of /proc/<pid>/map_files/*

Browse Source 
Entries under /proc/<pid>/map_files/* are ephemeral and may go away
before the process dies. As such allowing them to be used as mount
points creates the ability to leak mounts that linger until the process
dies with no ability to unmount them until then. Don't allow using them
as mountpoints.

Link: https://lore.kernel.org/r/20240806-work-procfs-v1-4-fb04e1d09f0c@kernel.org
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-08-06 18:02:30 +02:00
parent 32a0a965b8
commit 3836b31c3e
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/proc/base.c
View File

@ -2276,8 +2276,8 @@ proc_map_files_instantiate(struct dentry *dentry,
inode->i_op = &proc_map_files_link_inode_operations;
inode->i_size = 64;
d_set_d_op(dentry, &tid_map_files_dentry_operations);
return d_splice_alias(inode, dentry);
return proc_splice_unmountable(inode, dentry,
&tid_map_files_dentry_operations);
}
static struct dentry *proc_map_files_lookup(struct inode *dir,