Commit Graph

114 Commits

Author SHA1 Message Date
Bryan Drewery
44f1c91610 Rename global cnt to vm_cnt to avoid shadowing.
To reduce the diff struct pcu.cnt field was not renamed, so
PCPU_OP(cnt.field) is still used. pc_cnt and pcpu are also used in
kvm(3) and vmstat(8). The goal was to not affect externally used KPI.

Bump __FreeBSD_version_ in case some out-of-tree module/code relies on the
the global cnt variable.

Exp-run revealed no ports using it directly.

No objection from:	arch@
Sponsored by:	EMC / Isilon Storage Division
2014-03-22 10:26:09 +00:00
Nathan Whitehorn
fec27435ab Rename sysctl kern.supported_abis to kern.supported_archs, since it gives
the set of MACHINE_ARCH values that can be run.
2013-12-04 16:38:40 +00:00
Nathan Whitehorn
3cb6654d23 Add new sysctl, kern.supported_abis, containing the list of FreeBSD
MACHINE_ARCH values whose binaries this kernel can run. This patch provides
a feature requested for implementing pkgng ABI identifiers in a robust
way.

The list is designed to indicate whether, say, an i386 package can be run on
the current system. If kern.supported_abis contains "i386", then the answer
is yes. Otherwise, the answer is no.

At the moment, this only supports MACHINE_ARCH and MACHINE_ARCH32. As we
gain support for more interesting combinations, this needs to become more
flexible, possibily through the sysent framework, along with the
hw.machine_arch emulation immediately preceding this code in kern_mib.c.

Reviewed by:	imp
MFC after:	3 days
2013-12-02 00:44:36 +00:00
Andriy Gapon
8eede5c4d9 fix some fat-fingering in r246246
Submitted by:	mjg
Pointyhat to:	avg
MFC after:	5 days
X-MFC with:	r246246
2013-02-02 14:19:50 +00:00
Andriy Gapon
bfdcb3bcba print compiler version in the kernel banner
And provide kernel compiler version as a sysctl as well.
This is useful while we have gcc and clang cohabitation.
This could be even more useful when we have support
for external toolchains.

In cooperation with:	mjg
MFC after:		13 days
2013-02-02 11:58:35 +00:00
Alfred Perlstein
d3bfafb4f6 back out half of 244098.
kern.bootfile needs to be rw for installkernel.

Pointed out by: kib, flo
2012-12-11 00:10:20 +00:00
Alfred Perlstein
d06cadae1e make sysctls kern.{bootfile,conftxt} read-only
MFC after:	1 month
2012-12-10 23:09:55 +00:00
Konstantin Belousov
3fa615bc11 As a safety measure, disable lowering pid_max too much.
Requested by:	Peter Jeremy <peter@rulingia.com>
MFC after:	1 week
2012-08-16 13:04:21 +00:00
Konstantin Belousov
02c6fc2114 Add a sysctl kern.pid_max, which limits the maximum pid the system is
allowed to allocate, and corresponding tunable with the same
name. Note that existing processes with higher pids are left intact.

MFC after:	1 week
2012-08-15 15:56:21 +00:00
Robert Watson
ff66f6a404 Define two new sysctl node flags: CTLFLAG_CAPRD and CTLFLAG_CAPRW, which
may be jointly referenced via the mask CTLFLAG_CAPRW.  Sysctls with these
flags are available in Capsicum's capability mode; other sysctl nodes are
not.

Flag several useful sysctls as available in capability mode, such as memory
layout sysctls required by the run-time linker and malloc(3).  Also expose
access to randomness and available kernel features.

A few sysctls are enabled to support name->MIB conversion; these may leak
information to capability mode by virtue of providing resolution on names
not flagged for access in capability mode.  This is, generally, not a huge
problem, but might be something to resolve in the future.  Flag these cases
with XXX comments.

Submitted by:	jonathan
Sponsored by:	Google, Inc.
2011-07-17 23:05:24 +00:00
Matthew D Fleming
fbbb13f962 sysctl(9) cleanup checkpoint: amd64 GENERIC builds cleanly.
Commit the kernel changes.
2011-01-12 19:54:19 +00:00
Konstantin Belousov
87d45a0392 When compat32 binary asks for the value of hw.machine_arch, report the
name of 32bit sibling architecture instead of the host one. Do the
same for hw.machine on amd64.

Add a safety belt debug.adaptive_machine_arch sysctl, to turn the
substitution off.

Reviewed by:	jhb, nwhitehorn
MFC after:	2 weeks
2010-07-22 09:13:49 +00:00
Brooks Davis
93833c1db6 Declare the kern.ngroups sysctl to be read-only, but tunable at boot for
better error reporting.

Submitted by:	Matthew Fleming <matthew dot fleming at isilon dot com>
MFC After:	1 month
2010-01-12 18:20:20 +00:00
Brooks Davis
412f9500e2 Replace the static NGROUPS=NGROUPS_MAX+1=1024 with a dynamic
kern.ngroups+1.  kern.ngroups can range from NGROUPS_MAX=1023 to
INT_MAX-1.  Given that the Windows group limit is 1024, this range
should be sufficient for most applications.

MFC after:	1 month
2010-01-12 07:49:34 +00:00
Brooks Davis
5feedc2575 Correct the explination text for the kern.ngroups. It reflects the
number of supplemental groups, not the total number of groups.

MFC after:	3 days
2010-01-09 23:22:31 +00:00
Alan Cox
fe105d45a2 Add a new sysctl for reporting all of the supported page sizes.
Reviewed by:	jhb
MFC after:	3 weeks
2009-09-18 17:04:57 +00:00
Jamie Gritton
c1f192193d Rename the host-related prison fields to be the same as the host.*
parameters they represent, and the variables they replaced, instead of
abbreviated versions of them.

Approved by:	bz (mentor)
2009-06-13 15:39:12 +00:00
Jamie Gritton
76ca6f88da Place hostnames and similar information fully under the prison system.
The system hostname is now stored in prison0, and the global variable
"hostname" has been removed, as has the hostname_mtx mutex.  Jails may
have their own host information, or they may inherit it from the
parent/system.  The proper way to read the hostname is via
getcredhostname(), which will copy either the hostname associated with
the passed cred, or the system hostname if you pass NULL.  The system
hostname can still be accessed directly (and without locking) at
prison0.pr_host, but that should be avoided where possible.

The "similar information" referred to is domainname, hostid, and
hostuuid, which have also become prison parameters and had their
associated global variables removed.

Approved by:	bz (mentor)
2009-05-29 21:27:12 +00:00
Jamie Gritton
0304c73163 Add hierarchical jails. A jail may further virtualize its environment
by creating a child jail, which is visible to that jail and to any
parent jails.  Child jails may be restricted more than their parents,
but never less.  Jail names reflect this hierarchy, being MIB-style
dot-separated strings.

Every thread now points to a jail, the default being prison0, which
contains information about the physical system.  Prison0's root
directory is the same as rootvnode; its hostname is the same as the
global hostname, and its securelevel replaces the global securelevel.
Note that the variable "securelevel" has actually gone away, which
should not cause any problems for code that properly uses
securelevel_gt() and securelevel_ge().

Some jail-related permissions that were kept in global variables and
set via sysctls are now per-jail settings.  The sysctls still exist for
backward compatibility, used only by the now-deprecated jail(2) system
call.

Approved by:	bz (mentor)
2009-05-27 14:11:23 +00:00
Marko Zec
29b02909eb Introduce a new virtualization container, provisionally named vprocg, to hold
virtualized instances of hostname and domainname, as well as a new top-level
virtualization struct vimage, which holds pointers to struct vnet and struct
vprocg.  Struct vprocg is likely to become replaced in the near future with
a new jail management API import.

As a consequence of this change, change struct ucred to point to a struct
vimage, instead of directly pointing to a vnet.

Merge vnet / vimage / ucred refcounting infrastructure from p4 / vimage
branch.

Permit kldload / kldunload operations to be executed only from the default
vimage context.

This change should have no functional impact on nooptions VIMAGE kernel
builds.

Reviewed by:	bz
Approved by:	julian (mentor)
2009-05-08 14:11:06 +00:00
Marko Zec
f6dfe47a14 Permit buiding kernels with options VIMAGE, restricted to only a single
active network stack instance.  Turning on options VIMAGE at compile
time yields the following changes relative to default kernel build:

1) V_ accessor macros for virtualized variables resolve to structure
fields via base pointers, instead of being resolved as fields in global
structs or plain global variables.  As an example, V_ifnet becomes:

    options VIMAGE:          ((struct vnet_net *) vnet_net)->_ifnet
    default build:           vnet_net_0._ifnet
    options VIMAGE_GLOBALS:  ifnet

2) INIT_VNET_* macros will declare and set up base pointers to be used
by V_ accessor macros, instead of resolving to whitespace:

    INIT_VNET_NET(ifp->if_vnet); becomes

    struct vnet_net *vnet_net = (ifp->if_vnet)->mod_data[VNET_MOD_NET];

3) Memory for vnet modules registered via vnet_mod_register() is now
allocated at run time in sys/kern/kern_vimage.c, instead of per vnet
module structs being declared as globals.  If required, vnet modules
can now request the framework to provide them with allocated bzeroed
memory by filling in the vmi_size field in their vmi_modinfo structures.

4) structs socket, ifnet, inpcbinfo, tcpcb and syncache_head are
extended to hold a pointer to the parent vnet.  options VIMAGE builds
will fill in those fields as required.

5) curvnet is introduced as a new global variable in options VIMAGE
builds, always pointing to the default and only struct vnet.

6) struct sysctl_oid has been extended with additional two fields to
store major and minor virtualization module identifiers, oid_v_subs and
oid_v_mod.  SYSCTL_V_* family of macros will fill in those fields
accordingly, and store the offset in the appropriate vnet container
struct in oid_arg1.
In sysctl handlers dealing with virtualized sysctls, the
SYSCTL_RESOLVE_V_ARG1() macro will compute the address of the target
variable and make it available in arg1 variable for further processing.

Unused fields in structs vnet_inet, vnet_inet6 and vnet_ipfw have
been deleted.

Reviewed by:	bz, rwatson
Approved by:	julian (mentor)
2009-04-30 13:36:26 +00:00
Ed Schouten
f3b86a5fd7 Mark most often used sysctl's as MPSAFE.
After running a `make buildkernel', I noticed most of the Giant locks in
sysctl are only caused by a very small amount of sysctl's:

- sysctl.name2oid. This one is locked by SYSCTL_LOCK, just like
  sysctl.oidfmt.

- kern.ident, kern.osrelease, kern.version, etc. These are just constant
  strings.

- kern.arandom, used by the stack protector. It is already protected by
  arc4_mtx.

I also saw the following sysctl's show up. Not as often as the ones
above, but still quite often:

- security.jail.jailed. Also mark security.jail.list as MPSAFE. They
  don't need locking or already use allprison_lock.

- kern.devname, used by devname(3), ttyname(3), etc.

This seems to reduce Giant locking inside sysctl by ~75% in my primitive
test setup.
2009-01-28 19:58:05 +00:00
Marko Zec
8b615593fc Step 1.5 of importing the network stack virtualization infrastructure
from the vimage project, as per plan established at devsummit 08/08:
http://wiki.freebsd.org/Image/Notes200808DevSummit

Introduce INIT_VNET_*() initializer macros, VNET_FOREACH() iterator
macros, and CURVNET_SET() context setting macros, all currently
resolving to NOPs.

Prepare for virtualization of selected SYSCTL objects by introducing a
family of SYSCTL_V_*() macros, currently resolving to their global
counterparts, i.e. SYSCTL_V_INT() == SYSCTL_INT().

Move selected #defines from sys/sys/vimage.h to newly introduced header
files specific to virtualized subsystems (sys/net/vnet.h,
sys/netinet/vinet.h etc.).

All the changes are verified to have zero functional impact at this
point in time by doing MD5 comparision between pre- and post-change
object files(*).

(*) netipsec/keysock.c did not validate depending on compile time options.

Implemented by:	julian, bz, brooks, zec
Reviewed by:	julian, bz, brooks, kris, rwatson, ...
Approved by:	julian (mentor)
Obtained from:	//depot/projects/vimage-commit2/...
X-MFC after:	never
Sponsored by:	NLnet Foundation, The FreeBSD Foundation
2008-10-02 15:37:58 +00:00
Tom Rhodes
1e018d99f2 Fix a typo in r180291
"NAme of the current YP/NIS domain" -> "Name of the current YP/NIS domain"
2008-08-28 23:52:34 +00:00
Bjoern A. Zeeb
603724d3ab Commit step 1 of the vimage project, (network stack)
virtualization work done by Marko Zec (zec@).

This is the first in a series of commits over the course
of the next few weeks.

Mark all uses of global variables to be virtualized
with a V_ prefix.
Use macros to map them back to their global names for
now, so this is a NOP change only.

We hope to have caught at least 85-90% of what is needed
so we do not invalidate a lot of outstanding patches again.

Obtained from:	//depot/projects/vimage-commit2/...
Reviewed by:	brooks, des, ed, mav, julian,
		jamie, kris, rwatson, zec, ...
		(various people I forgot, different versions)
		md5 (with a bit of help)
Sponsored by:	NLnet Foundation, The FreeBSD Foundation
X-MFC after:	never
V_Commit_Message_Reviewed_By:	more people than the patch
2008-08-17 23:27:27 +00:00
Robert Watson
4f7d1876d5 Introduce a new lock, hostname_mtx, and use it to synchronize access
to global hostname and domainname variables.  Where necessary, copy
to or from a stack-local buffer before performing copyin() or
copyout().  A few uses, such as in cd9660 and daemon_saver, remain
under-synchronized and will require further updates.

Correct a bug in which a failed copyin() of domainname would leave
domainname potentially corrupted.

MFC after:	3 weeks
2008-07-05 13:10:10 +00:00
Antoine Brodin
370f990d30 Make sysctl_kern_arnd return a random buffer instead of a random long,
as it is expected by userland (stack protector guard setup for example).

PR:		119129
Approved by:	rwatson (mentor)
MFC after:	1 month
2008-02-17 16:44:48 +00:00
John Baldwin
2c17901060 Add 'compat_freebsd[4567]' features corresponding to the kernel options
COMPAT_FREEBSD[4567].

MFC after:	1 week
Requested by:	kris
2008-01-17 22:46:32 +00:00
John Baldwin
0deabe7e53 Actually declare the kern.features sysctl node.
Pointy hat to:	jhb
2007-12-31 22:03:57 +00:00
Konstantin Belousov
f231de478e Implement fetching of the __FreeBSD_version from the ELF ABI-tag note.
The value is read into the p_osrel member of the struct proc. p_osrel
is set to 0 for the binaries without the note.

MFC after:	3 days
2007-12-04 12:28:07 +00:00
Attilio Rao
2feb50bf7d Revert VMCNT_* operations introduction.
Probabilly, a general approach is not the better solution here, so we should
solve the sched_lock protection problems separately.

Requested by: alc
Approved by: jeff (mentor)
2007-05-31 22:52:15 +00:00
Warner Losh
cfa7a8beea Simplify the kernel configuration file return code.
Reviewed by: wkoszek
2007-05-28 20:41:10 +00:00
Alexander Kabaev
ee9f46615e Add kern.arnd sysctl. SSP code uses it to initialize the stack guard
magic value.

Submitted by: Jeremie Le Hen <jeremie@le-hen.org>
2007-05-19 04:53:14 +00:00
Jeff Roberson
222d01951f - define and use VMCNT_{GET,SET,ADD,SUB,PTR} macros for manipulating
vmcnts.  This can be used to abstract away pcpu details but also changes
   to use atomics for all counters now.  This means sched lock is no longer
   responsible for protecting counts in the switch routines.

Contributed by:		Attilio Rao <attilio@FreeBSD.org>
2007-05-18 07:10:50 +00:00
Warner Losh
3627f73782 Don't export a kern.conftxt sysctl, except when INCLUDE_CONF_FILE is
defined.  This restores the old behavior, and eliminates the
dependency on the kernconf.tmpl when INCLUDE_CONFIG_FILE isn't
included in the kernel config.  There were many people in the terminal
room that had almost, but not quite, up-to-date config files that this
helps.  I don't know if this is the result of skew among the cvsup
servers, or some other more subtle problem.  However, this fix should
work for any config of recent vintage (I tested with the latest, and
one before the recent changes, and eye-balled the intermediate
versions).

Reviewed by: the terminal room crew
2007-05-17 05:05:12 +00:00
Wojciech A. Koszek
5f9974ae57 Handle !INCLUDE_CONFIG_FILE entirely in the kernel. This should make some
developers happy, since it will let them to use old config(8) with newer
kernels.

Reviewed by:	imp
Approved by:	imp
2007-05-16 16:08:04 +00:00
Wojciech A. Koszek
744b947ef8 Improve INCLUDE_CONFIG_FILE support.
This change will let us to have full configuration of a running kernel
available in sysctl:

	sysctl -b kern.conftxt

The same configuration is also contained within the kernel image. It can be
obtained with:

	config -x <kernelfile>

Current functionality lets you to quickly recover kernel configuration, by
simply redirecting output from commands presented above and starting kernel
build procedure. "include" statements are also honored, which means options
and devices from included files are also included.

Please note that comments from configuration files are not preserved by
default. In order to preserve them, you can use -C flag for config(8). This
will bring configuration file and included files literally; however,
redirection to a file no longer works directly.

This commit was followed by discussion, that took place on freebsd-current@.
For more details, look here:

	http://lists.freebsd.org/pipermail/freebsd-current/2007-March/069994.html
	http://lists.freebsd.org/pipermail/freebsd-current/2007-May/071844.html

Development of this patch took place in Perforce, hierarchy:

	//depot/user/wkoszek/wkoszek_kconftxt/

Support from:	freebsd-current@ (links above)
Reviewed by:	imp@
Approved by:	imp@
2007-05-12 19:38:18 +00:00
Pawel Jakub Dawidek
82068fe7a9 Add kern.hostuuid sysctl, which will be used to keep host's UUID.
Reviewed by:	mlaier, rink, brooks, rwatson
2007-04-09 19:18:09 +00:00
Pawel Jakub Dawidek
4e4aa37e75 mp_ncpus is always (properly) initialized, even on UP kernels, so just use it. 2005-08-21 18:03:31 +00:00
Poul-Henning Kamp
31cc57cdbd Collect the devfs related sysctls in one place 2005-08-16 19:25:02 +00:00
Wes Peters
a09150446d Add a sysctl that records the amount of physical memory in the machine.
Submitted by:	Nicko Dehaine <nicko@stbernard.com>
MFC after:	1 day
2005-02-28 21:42:56 +00:00
Robert Watson
78bb1895ab Fix spelling of integer in a comment.
Beady eyes:	ceri
2005-01-30 00:31:19 +00:00
Robert Watson
4261ed50fd When retrieving the current per-jails securelevel for a sysctl read,
don't acquire the prison mutex, as it's an integer read and races
here don't make a difference.

MFC after:	1 week
2005-01-23 20:59:19 +00:00
Warner Losh
7f8a436ff2 Remove advertising clause from University of California Regent's license,
per letter dated July 22, 1999.

Approved by: core
2004-04-05 21:03:37 +00:00
Mike Silbersack
184dcdc7c8 Change all SYSCTLS which are readonly and have a related TUNABLE
from CTLFLAG_RD to CTLFLAG_RDTUN so that sysctl(8) can provide
more useful error messages.
2003-10-21 18:28:36 +00:00
Eivind Eklund
effb9ebd01 Change description of kern.osreldate from "Operating system release date" to
"Kernel release date" - userland version is in /usr/include/osreldate.h
2003-08-21 14:47:08 +00:00
David E. O'Brien
677b542ea2 Use __FBSDID(). 2003-06-11 00:56:59 +00:00
Juli Mallett
c02d762181 Attempt to fix Alpha build by renaming ident[] to kern_ident[]. 2003-06-09 18:19:33 +00:00
Juli Mallett
da1186f2c7 Expose kern.ident by way of OID_AUTO.
Requested by:	phk
2003-06-09 10:54:23 +00:00
Mark Murray
51da11a27a Fix some easy, global, lint warnings. In most cases, this means
making some local variables static. In a couple of cases, this means
removing an unused variable.
2003-04-30 12:57:40 +00:00