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() >
But what does the error mean ? A buggy application ? IIUC, it indicate a buggy kernel isn't it ?. So should we kill the application or panic() ? > 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 a4db22f..f162e77 100644 > --- a/arch/powerpc/mm/fault.c > +++ b/arch/powerpc/mm/fault.c > @@ -404,6 +404,10 @@ good_area: > (cpu_has_feature(CPU_FTR_NOEXECUTE) || > !(vma->vm_flags & (VM_READ | VM_WRITE)))) > goto bad_area; > +#ifdef CONFIG_PPC_RADIX_MMU > + if (radix_enabled() && regs->msr & PPC_BIT(35)) > + goto bad_area; > +#endif > #ifdef CONFIG_PPC_STD_MMU > /* > * protfault should only happen due to us -aneesh
