Quoting Eric W. Beiderman (ebiederm@xxxxxxxxxxxx):
> From: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
>
> Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Acked-by: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>
> ---
> fs/open.c | 13 +++++++++++--
> 1 files changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/fs/open.c b/fs/open.c
> index 92335f6..e166801 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 |=
> --
> 1.7.2.5
>
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