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c77fb07fae
Johannes Berg says:
====================
netlink: export policy on validation failures
Export the policy used for attribute validation when it fails,
so e.g. for an out-of-range attribute userspace immediately gets
the valid ranges back.
v2 incorporates the suggestion from Jakub to have a function to
estimate the size (netlink_policy_dump_attr_size_estimate()) and
check that it does the right thing on the *normal* policy dumps,
not (just) when calling it from the error scenario.
v3 only addresses a few minor style issues.
v4 fixes up a forgotten 'git add' ... sorry.
v5 is a resend, I messed up v4's cover letter subject (saying v3)
and apparently the second patch didn't go out at all.
Tested using nl80211/iw in a few scenarios, seems to work fine
and return the policy back, e.g.
kernel reports: integer out of range
policy: 04 00 0b 00 0c 00 04 00 01 00 00 00 00 00 00 00
^ padding
^ minimum allowed value
policy: 04 00 0b 00 0c 00 05 00 ff ff ff ff 00 00 00 00
^ padding
^ maximum allowed value
policy: 08 00 01 00 04 00 00 00
^ type 4 == U32
for an out-of-range case.
====================
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.