On Thu, Apr 20, 2017 at 08:45:28AM -0700, Dave Hansen wrote: > How about doing X86_TRAP_PF? That would at least be consistent with > SIGBUS, which is probably the closest thing to a generic error code that > we have.
Correct me if I am wrong, but for SIGBUS this only happens in the page-fault path, right? And this path is indeed entered on a #PF exception. I see no reason to lie to user-space about the trap_nr that caused the SIGSEGV, especially since user-space software needs to be modified to make use of MPX, including the signal handler. So there is no risk of introducing any incompatibility or regression, no? Joerg