On Thu, Oct 26, 2017 at 12:59:55AM -0700, Andy Lutomirski wrote: > On Tue, Oct 3, 2017 at 8:54 PM, Ricardo Neri > <ricardo.neri-calde...@linux.intel.com> wrote: > > fixup_umip_exception() will be called from do_general_protection(). If the > > former returns false, the latter will issue a SIGSEGV with SEND_SIG_PRIV. > > However, when emulation is successful but the emulated result cannot be > > copied to user space memory, it is more accurate to issue a SIGSEGV with > > SEGV_MAPERR with the offending address. A new function, inspired in > > force_sig_info_fault(), is introduced to model the page fault. > > This code is slightly buggy (with, for example, PKRU, although the > chance that anyone ever notices is about nil). For an alternative > approach, see current->thread.sig_on_uaccess_err, used in > arch/x86/entry/vsyscall/vsyscall_64.c. But I'm fine with this patch > as is, too.
Thanks Andy, I will study the alternative you mention. Since you are OK with this patch, I will submit v10 of this series to allow the review of the series to continue. BR, Ricardo