Messages in this thread | | | From | Andy Shevchenko <> | Date | Mon, 25 Sep 2017 20:04:21 +0300 | Subject | Re: [PATCH 06/12] platform/x86: dell-wmi-smbios: Add a sysfs interface for SMBIOS tokens |
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On Mon, Sep 25, 2017 at 7:23 PM, Pali Rohár <pali.rohar@gmail.com> wrote: > On Thursday 21 September 2017 08:57:11 Mario Limonciello wrote: >> Currently userspace tools can access system tokens via the dcdbas >> kernel module and a SMI call that will cause the platform to execute >> SMM code. >> >> With a goal in mind of deprecating the dcdbas kernel module a different >> method for accessing these tokens from userspace needs to be created. >> >> This is intentionally marked to only be readable as root as it can >> contain sensitive information about the platform's configuration. > > Darren, Andy, any comments? I'm not quite sure if such API is suitable > for long term in kernel.
I would try to avoid sysfs interfaces for some particular devices. Besides we are creating a character device. Would it be suitable there?
> Basically tokens are list of tuples <id, location, value> with > possibility to active them, right? > > Does not kernel have some better API for it?
I think the best what kernel may provide is a CSV-like format with or without title line and different delimiter (TAB/space/etc).
> > Also, keep in mind security aspect of tokens. They represent e.g. boot > order priority or enable/disable some machine peripheral.
For IOCTLs we may use capabilities. In sysfs case we may zero output based on capabilities or some other factors.
-- With Best Regards, Andy Shevchenko
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