[Linux-ia64] problems with ppp/pppd: put_user/copy_to_user

[Linux-ia64] problems with ppp/pppd: put_user/copy_to_user

[Bill Nottingham]

We've got a report of ppp not working; what happens is that it
puts in the log:
    Couldn't get channel number: bad address

when it sends the PPPIOCGCHAN ioctl.

However, if we replace the calls to put_user for
PPPIOCGCHAN & PPPIOCGFLAGS ioctls with copy_to_user,
it works fine. Shouldn't this not make any difference?

Bill

RE: [Linux-ia64] problems with ppp/pppd: put_user/copy_to_user

[Luck, Tony]

Do you have "ppp" compiled as a module?  There is a problem
with exception handling for modules ... I'm working on a
patch now.

-----Original Message-----
From: Bill Nottingham [mailto:notting@redhat.com]
Sent: Wednesday, May 23, 2001 11:57 AM
To: linux-ia64@linuxia64.org
Subject: [Linux-ia64] problems with ppp/pppd: put_user/copy_to_user


We've got a report of ppp not working; what happens is that it
puts in the log:
    Couldn't get channel number: bad address

when it sends the PPPIOCGCHAN ioctl.

However, if we replace the calls to put_user for
PPPIOCGCHAN & PPPIOCGFLAGS ioctls with copy_to_user,
it works fine. Shouldn't this not make any difference?

Bill

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Re: [Linux-ia64] problems with ppp/pppd: put_user/copy_to_user

[Bill Nottingham]

Luck, Tony (tony.luck@intel.com) said: 
> Do you have "ppp" compiled as a module?  There is a problem
> with exception handling for modules ... I'm working on a
> patch now.

Yes, but why would that make a difference?

Bill

Re: [Linux-ia64] problems with ppp/pppd: put_user/copy_to_user

[David Mosberger]

>>>>> On Wed, 23 May 2001 14:56:43 -0400, Bill Nottingham <notting@redhat.com> said:

  Bill> We've got a report of ppp not working; what happens is that it
  Bill> puts in the log: Couldn't get channel number: bad address

  Bill> when it sends the PPPIOCGCHAN ioctl.

  Bill> However, if we replace the calls to put_user for PPPIOCGCHAN &
  Bill> PPPIOCGFLAGS ioctls with copy_to_user, it works
  Bill> fine. Shouldn't this not make any difference?

It should not make a difference.  Is there an easy test case that
reproduces the problem?

	--daivd

Re: [Linux-ia64] problems with ppp/pppd: put_user/copy_to_user

[Bill Nottingham]

David Mosberger (davidm@hpl.hp.com) said: 
>   Bill> However, if we replace the calls to put_user for PPPIOCGCHAN &
>   Bill> PPPIOCGFLAGS ioctls with copy_to_user, it works
>   Bill> fine. Shouldn't this not make any difference?
> 
> It should not make a difference.  Is there an easy test case that
> reproduces the problem?

Hm, not sure if there's something simpler than having two machines talk
ppp over a serial cable. I'll poke around.

Bill