linux-kernel - Re: [PATCH v2] platform/x86: wmi-bmof: New driver to expose embedded Binary WMI MOF metadata

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]

Date:   Tue, 6 Jun 2017 15:31:22 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Pali Rohár <pali.rohar@...il.com>,
        platform-driver-x86@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mario Limonciello <mario_limonciello@...l.com>,
        Rafael Wysocki <rjw@...ysocki.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v2] platform/x86: wmi-bmof: New driver to expose embedded
 Binary WMI MOF metadata

On Mon, Jun 5, 2017 at 8:16 PM, Andy Lutomirski <luto@...nel.org> wrote:
> +static ssize_t
> +read_bmof(struct file *filp, struct kobject *kobj,
> +        struct bin_attribute *attr,
> +        char *buf, loff_t off, size_t count)
> +{
> +       struct bmof_priv *priv =
> +               container_of(attr, struct bmof_priv, bmof_bin_attr);
> +
> +       if (off >= priv->bmofdata->buffer.length)
> +               return 0;
> +
> +       if (count > priv->bmofdata->buffer.length - off)
> +               count = priv->bmofdata->buffer.length - off;
> +
> +       memcpy(buf, priv->bmofdata->buffer.pointer + off, count);
> +       return count;
> +}

I just discovered simple_read_from_buffer().  I think this whole
function could be:

struct bmof_priv *priv = ...;
return simple_read_from_buffer(buf, count, &off,
priv->bmofdata->buffer.pointer, priv->bmofdata->buffer.length);

--Andy