linux-kernel - Re: [PATCH 3/6] [v2] hexagon: use generic strncpy/strnlen from

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Message-ID: <CAK8P3a30+Y=9GGjP5ec-h6w9ZLqgzm_4YWpmwRimUjv8NdcuFA@mail.gmail.com>
Date:   Mon, 17 May 2021 08:46:02 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     linux-arch <linux-arch@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Vineet Gupta <vgupta@...opsys.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Brian Cain <bcain@...eaurora.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Sid Manning <sidneym@...eaurora.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...nel.org>,
        "open list:SYNOPSYS ARC ARCHITECTURE" 
        <linux-snps-arc@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "moderated list:H8/300 ARCHITECTURE" 
        <uclinux-h8-devel@...ts.sourceforge.jp>,
        "open list:QUALCOMM HEXAGON..." <linux-hexagon@...r.kernel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-um <linux-um@...ts.infradead.org>
Subject: Re: [PATCH 3/6] [v2] hexagon: use generic strncpy/strnlen from_user

On Mon, May 17, 2021 at 8:16 AM Christoph Hellwig <hch@....de> wrote:
>
> On Sat, May 15, 2021 at 12:18:00PM +0200, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@...db.de>
> >
> > Most per-architecture versions of these functions are broken in some form,
> > and they are almost certainly slower than the generic code as well.
> >
> > Remove the ones for hexagon and instead use the generic version.
> > This custom version reads the data twice for strncpy() by doing an extra
> > strnlen(), and it apparently lacks a check for user_addr_max().
>
> I'd be tempted to just remove the first paragraph and reword the second
> as:
>
> Remove the hexagon implementation of strncpy/strnlen and instead use the
> generic versions.  The hexago version of strncpy reads the data twice by
> doing an extra strnlen(), and it apparently lacks a check for
> user_addr_max().

Changed to your version now, thanks!

        Arnd