On Fri, Jul 07, 2017 at 10:35:41AM -0700, Linus Torvalds wrote:
> Comments? Michael, does this work for your case?
Looks sane...
> +++ b/fs/fcntl.c
> @@ -520,50 +520,50 @@ SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
>
> #ifdef CONFIG_COMPAT
> /* careful - don't use anywhere else */
> -#define copy_flock_fields(from, to) \
> - (to).l_type = (from).l_type; \
> - (to).l_whence = (from).l_whence; \
> - (to).l_start = (from).l_start; \
> - (to).l_len = (from).l_len; \
> - (to).l_pid = (from).l_pid;
> -
> -static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
> +#define copy_flock_fields(dst, src) \
> + (dst)->l_type = (src)->l_type; \
> + (dst)->l_whence = (src)->l_whence; \
> + (dst)->l_start = (src)->l_start; \
> + (dst)->l_len = (src)->l_len; \
> + (dst)->l_pid = (src)->l_pid;
> +
> +static int get_compat_flock(struct flock *kfl, const struct compat_flock __user *ufl)
> {
> struct compat_flock fl;
>
> if (copy_from_user(&fl, ufl, sizeof(struct compat_flock)))
> return -EFAULT;
> - copy_flock_fields(*kfl, fl);
> + copy_flock_fields(kfl, &fl);
> return 0;
> }
>
> -static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
> +static int get_compat_flock64(struct flock *kfl, const struct compat_flock64 __user *ufl)
> {
> struct compat_flock64 fl;
>
> if (copy_from_user(&fl, ufl, sizeof(struct compat_flock64)))
> return -EFAULT;
> - copy_flock_fields(*kfl, fl);
> + copy_flock_fields(kfl, &fl);
> return 0;
> }
>
> -static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
> +static int put_compat_flock(const struct flock *kfl, struct compat_flock __user *ufl)
> {
> struct compat_flock fl;
>
> memset(&fl, 0, sizeof(struct compat_flock));
> - copy_flock_fields(fl, *kfl);
> + copy_flock_fields(&fl, kfl);
> if (copy_to_user(ufl, &fl, sizeof(struct compat_flock)))
> return -EFAULT;
> return 0;
> }
>
> -static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
> +static int put_compat_flock64(const struct flock *kfl, struct compat_flock64 __user *ufl)
> {
> struct compat_flock64 fl;
>
> memset(&fl, 0, sizeof(struct compat_flock64));
> - copy_flock_fields(fl, *kfl);
> + copy_flock_fields(&fl, kfl);
> if (copy_to_user(ufl, &fl, sizeof(struct compat_flock64)))
> return -EFAULT;
> return 0;
