Re: [RFC PATCH v1 3/3] selftests/x86: Augment SGX selftest to test new __vdso_sgx_enter_enclave() and its callback interface

[Sean Christopherson]

On Mon, Apr 22, 2019 at 06:29:06PM -0700, Andy Lutomirski wrote:
> On Mon, Apr 22, 2019 at 5:37 PM Cedric Xing <cedric.xing@xxxxxxxxx> wrote:
> >
> > Given the changes to __vdso_sgx_enter_enclave(), the selftest is augmented to
> > test the newly added callback interface. This addtional test marks the whole
> > enclave range as PROT_READ, and calls mprotect() upon #PFs to add necessary PTE
> > permissions per PFEC (#PF Error Code) until the enclave finishes.
> 
> Nifty.
> 
> What's not tested here is running this code with EFLAGS.TF set and
> making sure that it unwinds correctly.  Also, Jarkko, unless I missed
> something, the vDSO extable code likely has a bug.  If you run the
> instruction right before ENCLU with EFLAGS.TF set, then do_debug()
> will eat the SIGTRAP and skip to the exception handler.  Similarly, if
> you put an instruction breakpoint on ENCLU, it'll get skipped.  Or is
> the code actually correct and am I just remembering wrong?

My money would be on the code being broken as opposed to you remembering
wrong.  I'll take a look at it tomorrow.