Balbir Singh <bsinghar...@gmail.com> writes: > ISA 3 allows for prevention of instruction fetch and execution > of user mode pages. If such an error occurs, SRR1 bit 35 > reports the error. We catch and report the error in do_page_fault() > > Signed-off-by: Balbir Singh <bsinghar...@gmail.com> > --- > arch/powerpc/mm/fault.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c > index d0b137d..835fd03 100644 > --- a/arch/powerpc/mm/fault.c > +++ b/arch/powerpc/mm/fault.c > @@ -404,6 +404,10 @@ int do_page_fault(struct pt_regs *regs, unsigned long > address, > (cpu_has_feature(CPU_FTR_NOEXECUTE) || > !(vma->vm_flags & (VM_READ | VM_WRITE)))) > goto bad_area; > + > + if (radix_enabled() && (regs->msr & SRR1_ISI_N_OR_G)) > + goto bad_area; > +
Can we also do this check early, ie, before down_read(mmap_sem) -aneesh
