diff options
Diffstat (limited to 'fs/fcntl.c')
| -rw-r--r-- | fs/fcntl.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/fs/fcntl.c b/fs/fcntl.c index 81b70e665bf0..887b5ba8c9b5 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; |