[Xen-devel] [PATCH 5/8] kexec: extend hypercall with improved load/unload ops

[Jan Beulich]

>>> On 16.04.13 at 19:13, David Vrabel <david.vrabel at citrix.com> wrote:
> -static int kexec_exec(XEN_GUEST_HANDLE_PARAM(void) uarg)
> +static int kexec_load(XEN_GUEST_HANDLE_PARAM(void) uarg)
>  {
> -    xen_kexec_exec_t exec;
> -    xen_kexec_image_t *image;
> -    int base, bit, pos, ret = -EINVAL;
> +    xen_kexec_load_t load;
> +    xen_kexec_segment_t *segments;
> +    struct kexec_image *kimage = NULL;
> +    int ret;
>  
> -    if ( unlikely(copy_from_guest(&exec, uarg, 1)) )
> +    if ( copy_from_guest(&load, uarg, 1) )
>          return -EFAULT;
>  
> -    if ( kexec_load_get_bits(exec.type, &base, &bit) )
> +    if ( load.nr_segments >= KEXEC_SEGMENT_MAX )
>          return -EINVAL;

Especially since you named the padding field _rsvd, you ought
to verify it to be zero somewhere here. Or if you're really sure
that nobody will ever want to make use of the field, name it
_pad instead.

Jan