Dom0 crash after bad use of gntdev

Dom0 crash after bad use of gntdev

[James Harper]

I have a bug in some code running in Dom0 that uses gntdev and it's
crashing Dom0 when it goes wrong. I'm not sure exactly what it's doing
wrong but is it acceptable for this to happen? The things I know are
that I'm passing an invalid array to xc_gnttab_map_grant_refs and then
unmapping it without checking the result of the mapping. I'm not sure
what else is going on aside from those two things.

James

Re: Dom0 crash after bad use of gntdev

[Jeremy Fitzhardinge]

On 12/05/2010 09:43 PM, James Harper wrote:
> I have a bug in some code running in Dom0 that uses gntdev and it's
> crashing Dom0 when it goes wrong. I'm not sure exactly what it's doing
> wrong but is it acceptable for this to happen? The things I know are
> that I'm passing an invalid array to xc_gnttab_map_grant_refs and then
> unmapping it without checking the result of the mapping. I'm not sure
> what else is going on aside from those two things.

In principle the kernel shouldn't crash as a result from misuse of an
ABI, and it often indicates some problem which might affect things in a
more subtle way under other circumstances.  Can you post the details of
your crash and what your program is doing?

Thanks,
    J