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

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Message-ID: <20181003150754.GC32759@asgard.redhat.com>
Date:   Wed, 3 Oct 2018 17:08:03 +0200
From:   Eugene Syromiatnikov <esyr@...hat.com>
To:     Yu-cheng Yu <yu-cheng.yu@...el.com>
Cc:     x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-mm@...ck.org,
        linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Andy Lutomirski <luto@...capital.net>,
        Balbir Singh <bsingharora@...il.com>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Florian Weimer <fweimer@...hat.com>,
        "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>,
        Peter Zijlstra <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>
Subject: Re: [RFC PATCH v4 18/27] x86/cet/shstk: User-mode shadow stack
 support

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.