Re: [RFC PATCH v4 18/27] x86/cet/shstk: User-mode shadow stack support

Eugene Syromiatnikov
2018-10-03T15:07:45Z

On Fri, Sep 21, 2018 at 08:03:42AM -0700, Yu-cheng Yu wrote:

> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 5ea1d64cb0b4..b20450dde5b7 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -652,6 +652,9 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
> [ilog2(VM_PKEY_BIT4)] = "",
> #endif
> #endif /* CONFIG_ARCH_HAS_PKEYS */
> +#ifdef CONFIG_X86_INTEL_SHADOW_STACK_USER
> + [ilog2(VM_SHSTK)] = "ss"
> +#endif

It's probably makes sense to have this hunk as a part of "x86/cet/shstk:
Add Kconfig option for user-mode shadow stack", where VM_SHSTK was
initially introduced.