On Fri, Apr 25, 2014 at 5:49 AM, Dan Carpenter <dan.carpen...@oracle.com> wrote:
> We copy "hdr->ioc_len" from the user twice but we only verify that it's
> within the limit on the first copy. Otherwise we could read unmapped
> memory and Oops.
>
Thanks for the patch.
Reviewed-by: Peng Tao <bergw...@gmail.com>
> Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
> ---
> Not tested.
>
> diff --git a/drivers/staging/lustre/lustre/obdclass/linux/linux-module.c
> b/drivers/staging/lustre/lustre/obdclass/linux/linux-module.c
> index e4e94cc..dec1037 100644
> --- a/drivers/staging/lustre/lustre/obdclass/linux/linux-module.c
> +++ b/drivers/staging/lustre/lustre/obdclass/linux/linux-module.c
> @@ -122,6 +122,8 @@ int obd_ioctl_getdata(char **buf, int *len, void *arg)
> OBD_FREE_LARGE(*buf, hdr.ioc_len);
> return err;
> }
> + if (hdr.ioc_len != data->ioc_len)
> + return -EINVAL;
>
> if (obd_ioctl_is_invalid(data)) {
> CERROR("ioctl not correctly formatted\n");
> diff --git a/drivers/staging/lustre/lustre/libcfs/linux/linux-module.c
> b/drivers/staging/lustre/lustre/libcfs/linux/linux-module.c
> index e6eae06..9a3b07b 100644
> --- a/drivers/staging/lustre/lustre/libcfs/linux/linux-module.c
> +++ b/drivers/staging/lustre/lustre/libcfs/linux/linux-module.c
> @@ -44,6 +44,7 @@ int libcfs_ioctl_getdata(char *buf, char *end, void *arg)
> {
> struct libcfs_ioctl_hdr *hdr;
> struct libcfs_ioctl_data *data;
> + int orig_len;
> int err;
>
> hdr = (struct libcfs_ioctl_hdr *)buf;
> @@ -69,9 +70,12 @@ int libcfs_ioctl_getdata(char *buf, char *end, void *arg)
> return -EINVAL;
> }
>
> + orig_len = hdr->ioc_len;
> err = copy_from_user(buf, (void *)arg, hdr->ioc_len);
> if (err)
> return err;
will you fix this as well?
Thanks,
Tao
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