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-rw-r--r--fs/fcntl.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 81b70e665bf..887b5ba8c9b 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -20,6 +20,7 @@
#include <linux/signal.h>
#include <linux/rcupdate.h>
#include <linux/pid_namespace.h>
+#include <linux/user_namespace.h>
#include <asm/poll.h>
#include <asm/siginfo.h>
@@ -340,6 +341,31 @@ static int f_getown_ex(struct file *filp, unsigned long arg)
return ret;
}
+#ifdef CONFIG_CHECKPOINT_RESTORE
+static int f_getowner_uids(struct file *filp, unsigned long arg)
+{
+ struct user_namespace *user_ns = current_user_ns();
+ uid_t * __user dst = (void * __user)arg;
+ uid_t src[2];
+ int err;
+
+ read_lock(&filp->f_owner.lock);
+ src[0] = from_kuid(user_ns, filp->f_owner.uid);
+ src[1] = from_kuid(user_ns, filp->f_owner.euid);
+ read_unlock(&filp->f_owner.lock);
+
+ err = put_user(src[0], &dst[0]);
+ err |= put_user(src[1], &dst[1]);
+
+ return err;
+}
+#else
+static int f_getowner_uids(struct file *filp, unsigned long arg)
+{
+ return -EINVAL;
+}
+#endif
+
static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
struct file *filp)
{
@@ -396,6 +422,9 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
case F_SETOWN_EX:
err = f_setown_ex(filp, arg);
break;
+ case F_GETOWNER_UIDS:
+ err = f_getowner_uids(filp, arg);
+ break;
case F_GETSIG:
err = filp->f_owner.signum;
break;