Hi! On Wed, Feb 26, 2020 at 03:35:35AM +1000, Nicholas Piggin wrote: > Kernel addresses and potentially other sensitive data could be leaked > in volatile registers after a syscall.
> cmpdi r3,0 > bne .Lsyscall_restore_regs > + li r0,0 > + li r4,0 > + li r5,0 > + li r6,0 > + li r7,0 > + li r8,0 > + li r9,0 > + li r10,0 > + li r11,0 > + li r12,0 > + mtctr r0 > + mtspr SPRN_XER,r0 > .Lsyscall_restore_regs_cont: What about LR? Is that taken care of later? This also deserves a big fat comment imo, it is very important after all, and not so obvious. Segher
