linux-kernel - Re: [PATCH v1 1/8] x86/entry/clearregs: Remove partial stack frame in fast system call

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Date:   Wed, 10 Jan 2018 17:02:35 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     Brian Gerst <brgerst@...il.com>
Cc:     Andi Kleen <andi@...stfloor.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Paul Turner <pjt@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Jiri Kosina <jikos@...nel.org>, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v1 1/8] x86/entry/clearregs: Remove partial stack frame
 in fast system call

> > execve et.al.: we will be leaking r11(rflags), rcx(orig return) into
> >             the new process. but that seems acceptable.
> 
> We still need to check if we are loading a 32-bit binary.  That must
> return with IRET.

True. Will fix.

-Andi