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hwmon: Clarify scope of attribute access

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Hardware monitoring sysfs attributes are used and displayed by unrestricted
userspace applications. Standard attributes therefore have to be world
readable, since otherwise those userspace applications would either have
to run as super-user or display an error. None of those makes sense.
Clarify the expected scope of attribute access in the ABI document.

Cc: Naveen Krishna Chatradhi <nchatrad@amd.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2021-04-19 10:59:48 -07:00
parent b94ca77eea
commit e1576396a7
1 changed files with 8 additions and 0 deletions
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8
Documentation/hwmon/sysfs-interface.rst
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@ -65,6 +65,14 @@ the desired value must be written, note that strings which are not a number
are interpreted as 0! For more on how written strings are interpreted see the
"sysfs attribute writes interpretation" section at the end of this file.
Attribute access
----------------
Hardware monitoring sysfs attributes are displayed by unrestricted userspace
applications. For this reason, all standard ABI attributes shall be world
readable. Writeable standard ABI attributes shall be writeable only for
privileged users.
-------------------------------------------------------------------------
======= ===========================================