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ovl: unprivieged mounts

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Enable unprivileged user namespace mounts of overlayfs.  Overlayfs's
permission model (*) ensures that the mounter itself cannot gain additional
privileges by the act of creating an overlayfs mount.

This feature request is coming from the "rootless" container crowd.

(*) Documentation/filesystems/overlayfs.txt#Permission model

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2020-12-14 15:26:14 +01:00
parent 87b2c60c61
commit 459c7c565a
1 changed files with 1 additions and 0 deletions
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fs/overlayfs/super.c
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@ -2096,6 +2096,7 @@ static struct dentry *ovl_mount(struct file_system_type *fs_type, int flags,
static struct file_system_type ovl_fs_type = {
.owner = THIS_MODULE,
.name = "overlay",
.fs_flags = FS_USERNS_MOUNT,
.mount = ovl_mount,
.kill_sb = kill_anon_super,
};