On Fri, Oct 21, 2005 at 08:32:25AM -0400, Bagalkote, Sreenivas wrote:
> >Jeff Garzik wrote:
> >> Do you know where there are some clear guidelines on the use of
> >> pointers in a structure passed to an ioctl to lessen (or bypass)
> >> 32<->64 compat ioctl thunking?
> >
> >Its impossible. If you pass pointers, you need to thunk.
> >(Not even passing pointers via sysfs can avoid this.)
> >Consider running a 32-bit app (with 32-bit pointers and 32-bit
> >ABI) on a 64-bit kernel.
>
> The drivers/scsi/megaraid/megaraid_mm.c simply calls regular ioctl
> from within the compat_ioctl, though it does copy to and from the
> userland pointers. This is done by adding appropriate padding.
Yes. This is what is meant by "thunk".
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
