From d83f5901bc0cd7131a3b8534169ee889efc4c257 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Wed, 30 Jan 2013 19:21:14 -0800 Subject: coda: Restrict coda messages to the initial user namespace Remove the slight chance that uids and gids in coda messages will be interpreted in the wrong user namespace. - Only allow processes in the initial user namespace to open the coda character device to communicate with coda filesystems. - Explicitly convert the uids in the coda header into the initial user namespace. - In coda_vattr_to_attr make kuids and kgids from the initial user namespace uids and gids in struct coda_vattr that just came from userspace. - In coda_iattr_to_vattr convert kuids and kgids into uids and gids in the intial user namespace and store them in struct coda_vattr for sending to coda userspace programs. Nothing needs to be changed with mounts as coda does not support being mounted in anything other than the initial user namespace. Cc: Jan Harkes Signed-off-by: "Eric W. Biederman" --- fs/coda/coda_linux.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'fs/coda/coda_linux.c') diff --git a/fs/coda/coda_linux.c b/fs/coda/coda_linux.c index 854ace712685..2849f41e72a2 100644 --- a/fs/coda/coda_linux.c +++ b/fs/coda/coda_linux.c @@ -100,9 +100,9 @@ void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr) if (attr->va_mode != (u_short) -1) inode->i_mode = attr->va_mode | inode_type; if (attr->va_uid != -1) - inode->i_uid = (uid_t) attr->va_uid; + inode->i_uid = make_kuid(&init_user_ns, (uid_t) attr->va_uid); if (attr->va_gid != -1) - inode->i_gid = (gid_t) attr->va_gid; + inode->i_gid = make_kgid(&init_user_ns, (gid_t) attr->va_gid); if (attr->va_nlink != -1) set_nlink(inode, attr->va_nlink); if (attr->va_size != -1) @@ -171,10 +171,10 @@ void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr) vattr->va_mode = iattr->ia_mode; } if ( valid & ATTR_UID ) { - vattr->va_uid = (vuid_t) iattr->ia_uid; + vattr->va_uid = (vuid_t) from_kuid(&init_user_ns, iattr->ia_uid); } if ( valid & ATTR_GID ) { - vattr->va_gid = (vgid_t) iattr->ia_gid; + vattr->va_gid = (vgid_t) from_kgid(&init_user_ns, iattr->ia_gid); } if ( valid & ATTR_SIZE ) { vattr->va_size = iattr->ia_size; -- cgit v1.2.3