linux-kernel - Re: [PATCH 2/2] x86/speculation: Provide application property based STIBP protection

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Message-ID: <733099f3-3d99-02d8-5641-8152167f0320@linux.intel.com>
Date:   Thu, 20 Sep 2018 10:17:09 -0700
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Casey Schaufler <casey.schaufler@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Jon Masters <jcm@...hat.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org
Subject: Re: [PATCH 2/2] x86/speculation: Provide application property based
 STIBP protection

On 09/20/2018 12:57 AM, Peter Zijlstra wrote:
> On Wed, Sep 19, 2018 at 02:35:30PM -0700, Tim Chen wrote:
>> +	if (get_dumpable(tsk->mm) != SUID_DUMP_USER)
>> +		test_and_set_tsk_thread_flag(tsk, TIF_STIBP);
>> +	else
>> +		test_and_clear_tsk_thread_flag(tsk, TIF_STIBP);
>> +}
> 
> s/test_and_//
> 

Ah yes.  Will update this.

Tim