linux-kernel - Re: [RFC][PATCH 01/22] x86 user stack frame reads: switch to explicit __get

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Message-ID: <CAHk-=wgs=mHpM3MxrHCShwo1A-U3mag1azVvKNEkQK36NroQ3A@mail.gmail.com>
Date:   Sun, 29 Mar 2020 11:19:57 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     David Laight <David.Laight@...lab.com>,
        Andy Lutomirski <luto@...capital.net>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [RFC][PATCH 01/22] x86 user stack frame reads: switch to explicit __get_user()

On Sun, Mar 29, 2020 at 11:18 AM Al Viro <viro@...iv.linux.org.uk> wrote:
>
> Except that you'd better make that
>         if (!user_access_begin(...))
>                 return -EFAULT;

Yeah, that should teach me not to just write random code snippets in
the mail reader rather than just cutting-and-pasting actual working
code ;)

                 Linus