On Fri, Apr 25, 2014 at 09:13:21AM +0200, walter harms wrote:
>
>
> Am 24.04.2014 23:49, schrieb Dan Carpenter:
> > The obd_ioctl_getdata() function caps "data->ioc_len" at
> > OBD_MAX_IOCTL_BUFFER and then calls this obd_ioctl_is_invalid() to check
> > that the other values inside data are valid.
> >
> > There are several lengths inside data but when they are added together
> > they must not be larger than "data->ioc_len". The checks against
> > "(data->ioc_inllen1 > (1<<30))" are supposed to ensure that the addition
> > does not have an integer overflow. But "(1<<30) * 4" actually can
> > overflow 32 bits so the checks are insufficient.
> >
> > I have changed it to "> OBD_MAX_IOCTL_BUFFER" instead.
> >
> > Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
> >
> > diff --git a/drivers/staging/lustre/lustre/include/lustre_lib.h
> > b/drivers/staging/lustre/lustre/include/lustre_lib.h
> > index 0368ca6..04f549e 100644
> > --- a/drivers/staging/lustre/lustre/include/lustre_lib.h
> > +++ b/drivers/staging/lustre/lustre/include/lustre_lib.h
> > @@ -192,23 +192,23 @@ static inline int obd_ioctl_packlen(struct
> > obd_ioctl_data *data)
> >
> > static inline int obd_ioctl_is_invalid(struct obd_ioctl_data *data)
> > {
> > - if (data->ioc_len > (1<<30)) {
> > + if (data->ioc_len > OBD_MAX_IOCTL_BUFFER) {
> > CERROR("OBD ioctl: ioc_len larger than 1<<30\n");
> > return 1;
> > }
>
> I would suggest to adjust the errormsg also like:
> CERROR("OBD ioctl: ioc_len larger than OBD_MAX_IOCTL_BUFFER\n");
>
> otherwise future debuggers will be confused.
>
> just my 2 cents
>
Ah yes. I will resend.
regards,
dan carpenter
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