On Thu, Oct 10, 2024 at 05:26:41PM +0200, Mickaël Salaün wrote: > When a filesystem manages its own inode numbers, like NFS's fileid shown > to user space with getattr(), other part of the kernel may still expose > the private inode->ino through kernel logs and audit. > > Another issue is on 32-bit architectures, on which ino_t is 32 bits, > whereas the user space's view of an inode number can still be 64 bits. > > Add a new inode_get_ino() helper calling the new struct > inode_operations' get_ino() when set, to get the user space's view of an > inode number. inode_get_ino() is called by generic_fillattr(). > > Implement get_ino() for NFS. The proper interface for that is ->getattr, and you should use that for all file systems (through the proper vfs wrappers). And yes, it's really time to move to a 64-bit i_ino, but that's a separate discussion.
