On Thu, Feb 04, 2016 at 04:17:42PM +0000, Russell King - ARM Linux wrote:
> On Thu, Feb 04, 2016 at 11:01:01AM -0500, Benjamin LaHaise wrote:
> > On Thu, Feb 04, 2016 at 02:39:07PM +0000, Russell King - ARM Linux wrote:
> > > However, this one should warn:
> > >
> > > int test_wrong(char **v, const char **p)
> > > { return __get_user(*v, p); }
> > >
> > > Good luck (I think you'll need lots of it to get a working solution)! :)
> >
> > This works with your test cases on x86-32. Note that it's only compile +
> > link tested at present.
>
> That's the easy bit!
>
> The problem you're going to run into is here:
>
> #define __get_user_nocheck(x, ptr, size) \
> ({ \
> int __gu_err; \
> unsigned long __gu_val; \
> __uaccess_begin(); \
> __get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT); \
> __uaccess_end(); \
> (x) = (__force __typeof__(*(ptr)))__gu_val; \
>
> __gu_val will be 32-bit, even when you're wanting a 64-bit quantity.
> That's where the fun and games start...
Ugh. You're making me install a 32 bit distro.....!
-ben
> --
> RMK's Patch system: http://www.arm.linux.org.uk/developer/patches/
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--
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