From 52137abe1820196d956bfd51edebc571b3427deb Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Sat, 3 Mar 2012 19:52:01 -0800 Subject: [PATCH] userns: Convert user specfied uids and gids in chown into kuids and kgid Acked-by: Serge Hallyn Signed-off-by: Eric W. Biederman --- fs/open.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/fs/open.c b/fs/open.c index 92335f663545..e16680138323 100644 --- a/fs/open.c +++ b/fs/open.c @@ -506,15 +506,24 @@ static int chown_common(struct path *path, uid_t user, gid_t group) struct inode *inode = path->dentry->d_inode; int error; struct iattr newattrs; + kuid_t uid; + kgid_t gid; + + uid = make_kuid(current_user_ns(), user); + gid = make_kgid(current_user_ns(), group); newattrs.ia_valid = ATTR_CTIME; if (user != (uid_t) -1) { + if (!uid_valid(uid)) + return -EINVAL; newattrs.ia_valid |= ATTR_UID; - newattrs.ia_uid = user; + newattrs.ia_uid = uid; } if (group != (gid_t) -1) { + if (!gid_valid(gid)) + return -EINVAL; newattrs.ia_valid |= ATTR_GID; - newattrs.ia_gid = group; + newattrs.ia_gid = gid; } if (!S_ISDIR(inode->i_mode)) newattrs.ia_valid |= -- 2.39.2