On Wed, 2012-10-10 at 16:44 +0100, David Laight wrote:
> > On Wed, 2012-10-10 at 15:59 +0100, David Laight wrote:
> > > Seems to me the code is expecting 256 bits of data, not any multiple of int,
> > > long or anything else.
> >
> > include/linux/isdn_ppp.h:#define PPPIOCGCOMPRESSORS _IOR('t',134,unsigned long [8])
>
> That doesn't mean the whole thing makes any sense on 64bit systems.
> A whole load of historic code used 'long' to ensure 32bit.
> Some of that might have crept into Linux sources.
Very true, but it's exported via copy_to_user.
> Since I suspect there are a maximum of 256 bits on both 32 and 64bit
> systems, I wouldn't like to guess exactly how any particular 64bit
> application chooses to check the bitmap.
>
> The ioctl constant may be wrong on 64 bit systems.
shrug. Not much to do about it now.
isdn isn't very active.
Karsten? What do you think?
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