libc: Purge unneeded cdefs.h

These sys/cdefs.h are not needed. Purge them. They are mostly left-over
from the $FreeBSD$ removal. A few in libc are still required for macros
that cdefs.h defines. Kee

libc: Purge unneeded cdefs.h

These sys/cdefs.h are not needed. Purge them. They are mostly left-over
from the $FreeBSD$ removal. A few in libc are still required for macros
that cdefs.h defines. Keep those.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D42385

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Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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libc: Use secure_getenv(3) where appropriate

No functional change intended.

Reviewed by: mjg, imp, kib
Differential Revision: https://reviews.freebsd.org/D39278

libc: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
p

libc: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

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Merge head r233826 through r256722.

IFC @256277

Approved by: ken (mentor)

IFC @ r255692

Comment out IA32_MISC_ENABLE MSR access - this doesn't exist on AMD.
Need to sort out how arch-specific MSRs will be handled.

Merge from head

IFC @ r255209

IFC

libc: Make various internal file descriptors from fopen() close-on-exec.

Add __FBSDID() tags.

MFC after: 3 days

Remove unused variables and function declarations. Add missing headers.

Staticize label_default_head to prevent it from leaking out of mac.c.

Obtained from: TrustedBSD Project
Sponsored by: DARPA, Network Associates Laboratories

Remove debugging printf that crept into the last commit.

/etc/mac.conf is implicitly read and parsed when the MAC configuration
is accessed for the first time as a result of an application looking
up label configuration information. Previously, the check

/etc/mac.conf is implicitly read and parsed when the MAC configuration
is accessed for the first time as a result of an application looking
up label configuration information. Previously, the check and read
were kicked off by mac_prepare_(typename)() functions; since
mac_prepare_type() may now be directly employed by a user process,
push the check and initialization into that function.

Obtained from: TrustedBSD Project
Sponsored by: DARPA, Network Associates Laboratories

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Return (-1) not (ENOENT) for mac_prepare_type(), and set errno to
ENOENT instead.

Reported by: "Kenneth D. Merry" <ken@kdm.org>
Submitted by: Bryan Liesner <bleez@comcast.net>

Make the elements argument to mac_prepare() be const.

Obtained from: TrustedBSD Project
Sponsored by: DARPA, Network Associates Laboratories

As new objects begin to support new labels, start to generalize
the default label support in /etc/mac.conf. Rather than maintain
each default label type in an explicit global variable in mac.c,
keep

As new objects begin to support new labels, start to generalize
the default label support in /etc/mac.conf. Rather than maintain
each default label type in an explicit global variable in mac.c,
keep a list of defaults loaded from the configuration file.
Generalize the parsing so that we support both the older:

default_file_labels foo
default_ifnet_labels foo
default_process_labels foo

And also a new:

default_labels file foo
default_labels ifnet foo
default_labels process foo

We now accept arbitrary object classes in the first argument. If
the same object is specified more than once, we discard the
earlier definition in favor of the later one.

Add a new API, mac_prepare_type(), which accepts a mac_t to
prepare, as well as an object name in the second argument, which
will pull a default label set for the object out of the
configuration loaded by mac_init_internal(). This permits the libc
to adapt to new objects known about by applications but not by libc
at compile-time.

Also liberalize the error handling a bit: if we're using implicit
initialization (i.e., the application didn't explicitly initialize
the MAC code), ignore syntax errors and only use valid lines. In
the future, we may want to add explicit warnings and do this a
bit more consistently.

While here, add support for a MAC_CONFFILE environmental variable,
which may be used to specify an alternative mac.conf configuration
file if the application isn't running with modified privilege
(issetugid()).

Obtained from: TrustedBSD Project
Sponsored by: DARPA, Network Associates Laboratories

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Whack 28 unused variables.

License update authorized by NAI: remove clause 3.

Do not include <sys/syslimits.h> directly; it is not intended for general
consumption.

Place mac_prepare() with the other mac_prepare*() functions.

Reflect MAC kernel/user API changes into the libc MAC implementation.
This removes a lot of complexity, since we basically just reserve
space on a retrieval of a label, and pass around strings. Two

Reflect MAC kernel/user API changes into the libc MAC implementation.
This removes a lot of complexity, since we basically just reserve
space on a retrieval of a label, and pass around strings. Two new
elements: (1) consumers of the API must now declare what label
elements they are interested in retrieving, or (2) rely on the default
provided in a new configuration file, mac.conf.

Approved by: re
Obtained from: TrustedBSD Project
Sponsored by: DARPA, Network Associates Laboratories

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