linux-kernel - Re: [PATCH v29 25/32] x86/cet/shstk: Handle thread shadow stack

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Message-ID: <44092e74-ce00-1518-5bc3-64657513329c@intel.com>
Date:   Thu, 26 Aug 2021 10:25:58 -0700
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>,
        Dave Martin <Dave.Martin@....com>,
        Weijiang Yang <weijiang.yang@...el.com>,
        Pengfei Xu <pengfei.xu@...el.com>,
        Haitao Huang <haitao.huang@...el.com>,
        Rick P Edgecombe <rick.p.edgecombe@...el.com>
Subject: Re: [PATCH v29 25/32] x86/cet/shstk: Handle thread shadow stack

On 8/26/2021 9:50 AM, Borislav Petkov wrote:
> On Fri, Aug 20, 2021 at 11:11:54AM -0700, Yu-cheng Yu wrote:
>> diff --git a/arch/x86/kernel/shstk.c b/arch/x86/kernel/shstk.c
>> index 5993aa8db338..7c1ca2476a5e 100644
>> --- a/arch/x86/kernel/shstk.c
>> +++ b/arch/x86/kernel/shstk.c
>> @@ -75,6 +75,61 @@ int shstk_setup(void)
>>   	return err;
>>   }
>>   
>> +int shstk_alloc_thread_stack(struct task_struct *tsk, unsigned long clone_flags,
>> +			     unsigned long stack_size)
>> +{
>> +	struct thread_shstk *shstk = &tsk->thread.shstk;
>> +	struct cet_user_state *state;
>> +	unsigned long addr;
>> +
>> +	if (!shstk->size)
>> +		return 0;
>> +
>> +	/*
>> +	 * Earlier clone() does not pass stack_size.  Use RLIMIT_STACK and
> 
> What is "earlier clone()"? >

I will make it just "clone()".

Thanks,
Yu-cheng