linux-kernel - Re: [PATCH v21 06/26] x86/cet: Add control-protection fault handler

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Message-ID: <db493c76-2a67-5f53-29a0-8333facac0f5@intel.com>
Date:   Wed, 24 Feb 2021 09:56:13 -0800
From:   "Yu, Yu-cheng" <yu-cheng.yu@...el.com>
To:     Borislav Petkov <bp@...en8.de>
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@...nel.org>,
        Balbir Singh <bsingharora@...il.com>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Eugene Syromiatnikov <esyr@...hat.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>,
        Dave Martin <Dave.Martin@....com>,
        Weijiang Yang <weijiang.yang@...el.com>,
        Pengfei Xu <pengfei.xu@...el.com>,
        Haitao Huang <haitao.huang@...el.com>,
        Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [PATCH v21 06/26] x86/cet: Add control-protection fault handler

On 2/24/2021 8:53 AM, Borislav Petkov wrote:
> On Wed, Feb 24, 2021 at 08:44:45AM -0800, Yu, Yu-cheng wrote:
>>>> +	force_sig_fault(SIGSEGV, SEGV_CPERR,
>>>> +			(void __user *)uprobe_get_trap_addr(regs));
>>>
>>> Why is this calling an uprobes function?
>>>
>>
>> I will change it to error_get_trap_addr().
> 
> "/*
>    * Posix requires to provide the address of the faulting instruction for
>    * SIGILL (#UD) and SIGFPE (#DE) in the si_addr member of siginfo_t.
>    ..."
> 
> Is yours SIGILL or SIGFPE?
> 

No.  Maybe I am doing too much.  The GP fault sets si_addr to zero, for 
example.  So maybe do the same here?