On Thu, 18 Jun 2020 at 16:50, Peter Zijlstra <pet...@infradead.org> wrote:
>
> Marco crashed in bad_iret with a Clang11/KCSAN build due to
> overflowing the stack. Now that we run C code on it, expand it to a
> full page.
>
> Suggested-by: Andy Lutomirski <l...@amacapital.net>
> Reported-by: Marco Elver <el...@google.com>
> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
This fixes the unpredictable crashes.
Tested-by: Marco Elver <el...@google.com>
Thanks!
> ---
> arch/x86/include/asm/processor.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> --- a/arch/x86/include/asm/processor.h
> +++ b/arch/x86/include/asm/processor.h
> @@ -370,7 +370,7 @@ struct x86_hw_tss {
> #define IO_BITMAP_OFFSET_INVALID (__KERNEL_TSS_LIMIT + 1)
>
> struct entry_stack {
> - unsigned long words[64];
> + char stack[PAGE_SIZE];
> };
>
> struct entry_stack_page {
>
>
