src/sys/dev/filemon/filemon_wrapper.c, branch releng/12.2

Fix some filemon path logging issues.

2018-08-03T19:24:04+00:00

- Properly handle snprintf return value for truncation and avoid
  overflowing the later write with the bogus length.
- Increase the msgbufr size to handle a rename of 2 full files.

The larger allocation causes a slight performance hit which will be mitigated
in the future.  A rewrite with sbufs will likely be done as well.

Reported by:	Ilja Van Sprundel 
MFC after:	2 weeks
Approved by:	so (gtetlow)
Reviewed by:	kib
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D16098

Move most of the contents of opt_compat.h to opt_global.h.

2018-04-06T17:35:35+00:00

opt_compat.h is mentioned in nearly 180 files. In-progress network
driver compabibility improvements may add over 100 more so this is
closer to "just about everywhere" than "only some files" per the
guidance in sys/conf/options.

Keep COMPAT_LINUX32 in opt_compat.h as it is confined to a subset of
sys/compat/linux/*.c.  A fake _COMPAT_LINUX option ensure opt_compat.h
is created on all architectures.

Move COMPAT_LINUXKPI to opt_dontuse.h as it is only used to control the
set of compiled files.

Reviewed by:	kib, cem, jhb, jtl
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D14941

sys/dev: further adoption of SPDX licensing ID tags.

2017-11-27T14:52:40+00:00

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified 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.

Cleanup COMPAT_FREEBSD32 support.

2016-06-05T18:16:33+00:00

This is a NOP.

The COMPAT_IA32 was renamed in r205014 to COMPAT_FREEBSD32 and
COMPAT_ARCH32 does not seem to have existed.  Also remove some
leftovers from the sysent rework in r301404.  Include
freebsd32_util.h for the freebsd32_sysent prototype.

X-MFC-With:	r301404
Reported by:	kib
MFC after:	3 days
Sponsored by:	EMC / Isilon Storage Division

Fix build after r301404.

2016-06-04T23:34:51+00:00

X-MFC-With:	r301404
MFC after:	1 week

Support all architectures by just using sysent.

2016-06-04T17:39:42+00:00

PowerPC64 has two different ABIs, neither of which is elf64_freebsd_sysvec.
Using sysent and freebsd32_sysent achieves the same effect.

X-MFC-With:	r301130
MFC after:	1 week
Sponsored by:	EMC / Isilon Storage Division

Don't truncate existing error when writing the log.

2016-05-27T23:58:00+00:00

Suggested by:	markj
MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division

Write to the log using the tracer's credentials.

2016-05-27T23:57:53+00:00

MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division

exec: Cease tracing if credentials will change with the new image.

2016-05-27T23:57:43+00:00

This also prevents tracing to a P_INEXEC process since it could race
with other processes attaching to it in filemon_event_process_exec() due
to the filemon_get_proc() race of incrementing ref and then locking the
filemon.  With the no-P_INEXEC invariant in place the p_filemon may only
be the same or NULL when trying to drop it in
filemon_event_process_exec().

MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division
Differential Revision:	https://reviews.freebsd.org/D6545

filemon exec: Use imgp->execpath rather than vn_fullpath(9).

2016-05-26T23:27:08+00:00

This will be more accurate as the actual name is provided if ran
from an absolute path in do_execve().

MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division