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authorEric W. Biederman <ebiederm@xmission.com>2012-02-07 16:26:03 -0800
committerEric W. Biederman <ebiederm@xmission.com>2012-11-14 22:05:33 -0800
commit499dcf2024092e5cce41d05599a5b51d1f92031a (patch)
tree868a90dc3d2e21276dedc34be6ef57a46ad62965 /init
parent45634cd8cb6541523227753944c7417ac3d20f94 (diff)
downloadlinaro-lsk-499dcf2024092e5cce41d05599a5b51d1f92031a.tar.gz
userns: Support fuse interacting with multiple user namespaces
Use kuid_t and kgid_t in struct fuse_conn and struct fuse_mount_data. The connection between between a fuse filesystem and a fuse daemon is established when a fuse filesystem is mounted and provided with a file descriptor the fuse daemon created by opening /dev/fuse. For now restrict the communication of uids and gids between the fuse filesystem and the fuse daemon to the initial user namespace. Enforce this by verifying the file descriptor passed to the mount of fuse was opened in the initial user namespace. Ensuring the mount happens in the initial user namespace is not necessary as mounts from non-initial user namespaces are not yet allowed. In fuse_req_init_context convert the currrent fsuid and fsgid into the initial user namespace for the request that will be sent to the fuse daemon. In fuse_fill_attr convert the uid and gid passed from the fuse daemon from the initial user namespace into kuids and kgids. In iattr_to_fattr called from fuse_setattr convert kuids and kgids into the uids and gids in the initial user namespace before passing them to the fuse filesystem. In fuse_change_attributes_common called from fuse_dentry_revalidate, fuse_permission, fuse_geattr, and fuse_setattr, and fuse_iget convert the uid and gid from the fuse daemon into a kuid and a kgid to store on the fuse inode. By default fuse mounts are restricted to task whose uid, suid, and euid matches the fuse user_id and whose gid, sgid, and egid matches the fuse group id. Convert the user_id and group_id mount options into kuids and kgids at mount time, and use uid_eq and gid_eq to compare the in fuse_allow_task. Cc: Miklos Szeredi <miklos@szeredi.hu> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'init')
-rw-r--r--init/Kconfig1
1 files changed, 0 insertions, 1 deletions
diff --git a/init/Kconfig b/init/Kconfig
index b6369fbaa22..38c1a1d0bf3 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1007,7 +1007,6 @@ config UIDGID_CONVERTED
depends on CEPH_FS = n
depends on CIFS = n
depends on CODA_FS = n
- depends on FUSE_FS = n
depends on GFS2_FS = n
depends on NCP_FS = n
depends on NFSD = n