From: Christian Brauner <[email protected]> Entries under /proc/<pid>/fd/* 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/[email protected] Reviewed-by: Josef Bacik <[email protected]> Signed-off-by: Christian Brauner <[email protected]> (cherry picked from commit 0175ac500806a8827f728a675943640f915c422a) https://virtuozzo.atlassian.net/browse/VSTOR-121919 Signed-off-by: Vasileios Almpanis <[email protected]> --- fs/proc/fd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/proc/fd.c b/fs/proc/fd.c index 0ffe6947b46c..5d6252dbefd1 100644 --- a/fs/proc/fd.c +++ b/fs/proc/fd.c @@ -202,8 +202,8 @@ static struct dentry *proc_fd_instantiate(struct dentry *dentry, ei->op.proc_get_link = proc_fd_link; tid_fd_update_inode(task, inode, data->mode); - d_set_d_op(dentry, &tid_fd_dentry_operations); - return d_splice_alias(inode, dentry); + return proc_splice_unmountable(inode, dentry, + &tid_fd_dentry_operations); } static struct dentry *proc_lookupfd_common(struct inode *dir, -- 2.43.0 _______________________________________________ Devel mailing list [email protected] https://lists.openvz.org/mailman/listinfo/devel
