From: Eric W. Biederman <ebiederm@xmission.com>
Date: Sun, 4 Mar 2012 03:52:01 +0000 (-0800)
Subject: userns: Convert user specfied uids and gids in chown into kuids and kgid
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=52137abe1820196d956bfd51edebc571b3427deb;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

userns: Convert user specfied uids and gids in chown into kuids and kgid

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---

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 |=