On Thu, Aug 30, 2018 at 09:47:36PM +0200, Jann Horn wrote: > I sloppily passed a kernel-typed pointer to __range_not_ok(), and sparse > doesn't like that. > Make `prologue` a __user pointer (to protect against accidental > dereferences) and force-cast it to a kernel pointer when calling > probe_kernel_read(), which will then immediately force-cast it back to a > user pointer.
It's a bit sad to have to do this. __range_not_ok() explicitly requires a __user pointer (I don't know if there is a good reason for it) but the real job is done by __chk_range_not_ok(). Can't you use this later instead? -- Luc Van Oostenryck
