On 10/26/23 12:29, Pawan Gupta wrote: > On Thu, Oct 26, 2023 at 07:25:27PM +0300, Nikolay Borisov wrote: >> On 25.10.23 г. 23:52 ч., Pawan Gupta wrote: >>> @@ -1520,6 +1530,7 @@ SYM_CODE_START(ignore_sysret) >>> UNWIND_HINT_END_OF_STACK >>> ENDBR >>> mov $-ENOSYS, %eax >>> + CLEAR_CPU_BUFFERS >> nit: Just out of curiosity is it really needed in this case or it's doesn >> for the sake of uniformity so that all ring3 transitions are indeed >> covered?? > Interrupts returning to kernel don't clear the CPU buffers. I believe > interrupts will be enabled here, and getting an interrupt here could > leak the data that interrupt touched. Specifically NMIs, right? X86_EFLAGS_IF should be clear here.
