On Sat, Sep 09, 2017 at 04:31:47PM -0700, Philip Guenther wrote: > Currently on amd64, the copyin(9) family of calls will pass through the > return value of uvm_fault() and thus return not just EFAULT but possibly > EACCES, ENOMEM, and EIO. Since the return value of those functions is > usually passed through to userspace, that's a Bad Thing IMO and we need to > fix them to always return EFAULT when uvm_fault() fails.
Personally I prefer to see the real error number in user land. It makes it easier to track down the cause of problems if you know the original errno. Of course amd64 and i386 should behave identically. Could we convert i386 instead? Are there arguments for always using EFAULT? bluhm
