On Wed, Sep 16, 2020 at 01:44:48PM +0200, Borislav Petkov wrote: > On Tue, Sep 15, 2020 at 02:28:21PM +0300, Jarkko Sakkinen wrote: > > From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx> > > > > Include SGX bit to the PF error codes and throw SIGSEGV with PF_SGX when > > a #PF with SGX set happens. > > > > CPU throws a #PF with the SGX set in the event of Enclave Page Cache Map > > (EPCM) conflict. The EPCM is a CPU-internal table, which describes the > > properties for a enclave page. Enclaves are measured and signed software > > entities, which SGX hosts. [1] > > > > Although the primary purpose of the EPCM conflict checks is to prevent > > malicious accesses to an enclave, an illegit access can happen also for > > legit reasons. > > > > All SGX reserved memory, including EPCM is encrypted with a transient key > > that does not survive from the power transition. Throwing a SIGSEGV allows > > user space software to react when this happens (e.g. recreate the enclave, > > which was invalidated). > > > > [1] Intel SDM: 36.5.1 Enclave Page Cache Map (EPCM) > > > > Acked-by: Jethro Beekman <jethro@xxxxxxxxxxxx> > > Reviewed-by: Darren Kenny <darren.kenny@xxxxxxxxxx> > > Reviewed-by: Borislav Petkov <bp@xxxxxxx> > > Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx> > > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> > > --- > > arch/x86/include/asm/traps.h | 14 ++++++++------ > > The SEV-ES patchset moved that to arch/x86/include/asm/trap_pf.h but > fixing that up is real easy. Simply do this search-replace > > s!arch/x86/include/asm/traps.h!arch/x86/include/asm/trap_pf.h! > > on this patch. Hey, I just did git fetch mainline && git rebase mainline/master Zero conflicts and there is no trap_pf.h yet. So this is not yet in Linus' tree? /Jarkko
