linux-kernel - Re: [PATCH 3/9] drivers/firewire/core-iso.c: Convert to use vm_insert_range

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAFqt6zYLDrC7CtLawWUAQPyB_M+5H8BikDR6LOm+v0qaq1GvZw@mail.gmail.com>
Date:   Fri, 25 Jan 2019 11:55:03 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...e.com>, stefanr@...6.in-berlin.de,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        robin.murphy@....com
Cc:     linux-kernel@...r.kernel.org, Linux-MM <linux-mm@...ck.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux1394-devel@...ts.sourceforge.net
Subject: Re: [PATCH 3/9] drivers/firewire/core-iso.c: Convert to use vm_insert_range_buggy

On Fri, Jan 11, 2019 at 8:34 PM Souptick Joarder <jrdr.linux@...il.com> wrote:
>
> Convert to use vm_insert_range_buggy to map range of kernel memory
> to user vma.
>
> This driver has ignored vm_pgoff and mapped the entire pages. We
> could later "fix" these drivers to behave according to the normal
> vm_pgoff offsetting simply by removing the _buggy suffix on the
> function name and if that causes regressions, it gives us an easy
> way to revert.
>
> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>

Any comment on this patch ?

> ---
>  drivers/firewire/core-iso.c | 15 ++-------------
>  1 file changed, 2 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c
> index 35e784c..99a6582 100644
> --- a/drivers/firewire/core-iso.c
> +++ b/drivers/firewire/core-iso.c
> @@ -107,19 +107,8 @@ int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
>  int fw_iso_buffer_map_vma(struct fw_iso_buffer *buffer,
>                           struct vm_area_struct *vma)
>  {
> -       unsigned long uaddr;
> -       int i, err;
> -
> -       uaddr = vma->vm_start;
> -       for (i = 0; i < buffer->page_count; i++) {
> -               err = vm_insert_page(vma, uaddr, buffer->pages[i]);
> -               if (err)
> -                       return err;
> -
> -               uaddr += PAGE_SIZE;
> -       }
> -
> -       return 0;
> +       return vm_insert_range_buggy(vma, buffer->pages,
> +                                       buffer->page_count);
>  }
>
>  void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
> --
> 1.9.1
>