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...
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