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Thomas Weißschuh 1cb925c086 nsfs: add compat ioctl handler
As all parameters and return values of the ioctls have the same
representation on both 32bit and 64bit we can reuse the normal ioctl
handler for the compat handler via compat_ptr_ioctl().

All nsfs ioctls return a plain "int" filedescriptor which is a signed
4-byte integer type on both 32bit and 64bit.
The only parameter taken is by NS_GET_OWNER_UID and is a pointer to a
"uid_t" which is a 4-byte unsigned integer type on both 32bit and 64bit.

Fixes: 6786741dbf ("nsfs: add ioctl to get an owning user namespace for ns file descriptor")
Reported-by: Karel Zak <kzak@redhat.com>
Link: https://github.com/util-linux/util-linux/pull/1924#issuecomment-1344133656
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
History 2023-01-11 15:32:49 -05:00
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README

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.