----- Original Message -----
> From: "Cyril Hrubis" <chru...@suse.cz>
> To: "Jan Stancek" <jstan...@redhat.com>
> Cc: ltp-list@lists.sourceforge.net
> Sent: Wednesday, 9 September, 2015 3:26:42 PM
> Subject: Re: [LTP] [PATCH] mprotect04: fix powerpc crash when copying
> exec_func
>
> Hi!
> > > > I'm seeing this on RHEL6.7 kernel, I haven't tried latest upstream yet.
> > >
> > > Ah, you are right, the memory is not touched in the write_null()
> > > function at all.
> >
> > Right, I got confused by "access_ok(VERIFY_READ, buf, count)"
> > in vfs_write(), but after reading code and comments it's clear it
> > only checks if range _may_ be valid:
> > * access_ok: - Checks if a user space pointer is valid
> > ...
> > * Returns true (nonzero) if the memory block may be valid, false (zero)
> > * if it is definitely invalid.
> > *
> > * Note that, depending on architecture, this function probably just
> > * checks that the pointer is in the user space range - after calling
> > * this function, memory access functions may still return -EFAULT.
>
> I do not have further questions. Acked.
Pushed.
Regards,
Jan
>
> --
> Cyril Hrubis
> chru...@suse.cz
>
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