linux-kernel - Re: [RFC][PATCH] get rid of the use of set_fs() (by way of kernel

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Message-ID: <CA+55aFzKPed+89wz=ajWNpsQ8Kh+AQWx61hwVqqDh7_=h4tecg@mail.gmail.com>
Date:   Wed, 17 Jan 2018 19:16:02 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Network Development <netdev@...r.kernel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>,
        kernel-hardening@...ts.openwall.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alan Cox <alan@...ux.intel.com>,
        David Miller <davem@...emloft.net>
Subject: Re: [RFC][PATCH] get rid of the use of set_fs() (by way of
 kernel_recvmsg()) in sunrpc

On Wed, Jan 17, 2018 at 7:06 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> Similar to the way put_cmsg() handles 32bit case on biarch
> targets, introduce a flag telling put_cmsg() to treat
> ->msg_control as kernel pointer, using memcpy instead of
> copy_to_user().  That allows to avoid the use of kernel_recvmsg()
> with its set_fs().

If this is the only case that kernel_recvmsg() exists for, then by all
means, that patch certainly looks like a good thing.

                 Linus