Commit Graph

84 Commits

Author SHA1 Message Date
David E. O'Brien
677b542ea2 Use __FBSDID(). 2003-06-11 00:56:59 +00:00
Martin Blapp
f130dcf22a Change the semantics of sysv shm emulation to take a additional
argument to the functions shm{at,ctl}1 and shm_find_segment_by_shmid{x}.
The BSD semantics didn't allow the usage of shared segment after
being marked for removal through IPC_RMID.

The patch involves the following functions:
  - shmat
  - shmctl
  - shm_find_segment_by_shmid
  - shm_find_segment_by_shmidx
  - linux_shmat
  - linux_shmctl

Submitted by:	Orlando Bassotto <orlando.bassotto@ieo-research.it>
Reviewed by:	marcel
2003-05-05 09:22:58 +00:00
Alan Cox
b077a36297 Lock some manipulations of the vm object's flags. 2003-04-13 19:36:18 +00:00
Warner Losh
a163d034fa Back out M_* changes, per decision of the TRB.
Approved by: trb
2003-02-19 05:47:46 +00:00
Alfred Perlstein
9d4156aed3 Fix logic in loop so it actually executes.
Pointed out by: fjoe
2003-02-16 16:12:10 +00:00
Alfred Perlstein
5015c68a3c prevent overflow in shminfo.shmmax 2003-02-16 06:08:55 +00:00
Alfred Perlstein
e1d7d0bb60 Bring shm functions closer the the opengroup standards.
PR: 47469
Submitted by: Craig Rodrigues <rodrigc@attbi.com>
2003-01-25 21:33:05 +00:00
Alfred Perlstein
44956c9863 Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.
Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.
2003-01-21 08:56:16 +00:00
Matthew Dillon
3db161e079 It is possible for an active aio to prevent shared memory from being
dereferenced when a process exits due to the vmspace ref-count being
bumped.  Change shmexit() and shmexit_myhook() to take a vmspace instead
of a process and call it in vmspace_dofree().  This way if it is missed
in exit1()'s early-resource-free it will still be caught when the zombie is
reaped.

Also fix a potential race in shmexit_myhook() by NULLing out
vmspace->vm_shm prior to calling shm_delete_mapping() and free().

MFC after:	7 days
2003-01-13 23:04:32 +00:00
Alan Cox
49bf855d20 Lock the vm object when performing back-to-back vm_object_clear_flag() and
vm_object_set_flag().
2003-01-02 18:32:13 +00:00
Alfred Perlstein
b618bb96f0 return foo -> return (foo) 2002-08-15 02:10:12 +00:00
Alfred Perlstein
8209f090f1 Change struct vmspace->vm_shm from void * to struct shmmap_state *, this
removes the need for casts in several cases.
2002-07-22 16:22:27 +00:00
Alfred Perlstein
2cc593fd8e Remove caddr_t. 2002-07-22 16:12:55 +00:00
Alfred Perlstein
4d77a549fe Remove __P. 2002-03-19 21:25:46 +00:00
John Baldwin
c6f55f33ea - Use td_ucred for jail checks.
- Move jail checks and some other checks involving constants and stack
  variables out from under Giant.  This isn't perfectly safe atm because
  jail_sysvipc_allowed is read w/o a lock meaning that its value could be
  stale.  This global variable will soon become a per-jail flag, however,
  at which time it will either not need a lock or will use the prison lock.
2002-03-05 18:57:36 +00:00
John Baldwin
a854ed9893 Simple p_ucred -> td_ucred changes to start using the per-thread ucred
reference.
2002-02-27 18:32:23 +00:00
Alfred Perlstein
21d56e9c33 Make AIO a loadable module.
Remove the explicit call to aio_proc_rundown() from exit1(), instead AIO
will use at_exit(9).

Add functions at_exec(9), rm_at_exec(9) which function nearly the
same as at_exec(9) and rm_at_exec(9), these functions are called
on behalf of modules at the time of execve(2) after the image
activator has run.

Use a modified version of tegge's suggestion via at_exec(9) to close
an exploitable race in AIO.

Fix SYSCALL_MODULE_HELPER such that it's archetecuterally neutral,
the problem was that one had to pass it a paramater indicating the
number of arguments which were actually the number of "int".  Fix
it by using an inline version of the AS macro against the syscall
arguments.  (AS should be available globally but we'll get to that
later.)

Add a primative system for dynamically adding kqueue ops, it's really
not as sophisticated as it should be, but I'll discuss with jlemon when
he's around.
2001-12-29 07:13:47 +00:00
Michael Reifenberger
491dec936c Introduce [IPC|SHM]_[INFO|STAT] to shmctl to make
`/compat/linux/usr/bin/ipcs -m` happy.
2001-10-28 09:29:10 +00:00
Paul Saab
cbc89bfbfe Make MAXTSIZ, DFLDSIZ, MAXDSIZ, DFLSSIZ, MAXSSIZ, SGROWSIZ loader
tunable.

Reviewed by:	peter
MFC after:	2 weeks
2001-10-10 23:06:54 +00:00
Michael Reifenberger
b3a4bc4247 PR: kern/29698 (part)
Reviewed by:	audit
Add tunables for the sem* and shm* syscontrols for tuning on boottime
until they become dynamic.
SAP R/3 doesn't like the compiled in defaults.
2001-09-13 20:20:09 +00:00
Julian Elischer
b40ce4165d KSE Milestone 2
Note ALL MODULES MUST BE RECOMPILED
make the kernel aware that there are smaller units of scheduling than the
process. (but only allow one thread per process at this time).
This is functionally equivalent to teh previousl -current except
that there is a thread associated with each process.

Sorry john! (your next MFC will be a doosie!)

Reviewed by: peter@freebsd.org, dillon@freebsd.org

X-MFC after:    ha ha ha ha
2001-09-12 08:38:13 +00:00
Matthew Dillon
b6a4b4f9ae Giant Pushdown: sysv shm, sem, and msg calls. 2001-08-31 00:02:18 +00:00
Matthew Dillon
0cddd8f023 With Alfred's permission, remove vm_mtx in favor of a fine-grained approach
(this commit is just the first stage).  Also add various GIANT_ macros to
formalize the removal of Giant, making it easy to test in a more piecemeal
fashion. These macros will allow us to test fine-grained locks to a degree
before removing Giant, and also after, and to remove Giant in a piecemeal
fashion via sysctl's on those subsystems which the authors believe can
operate without Giant.
2001-07-04 16:20:28 +00:00
Dima Dorfman
a723c4e173 Export via sysctl:
* all members of msginfo from sysv_msg.c;
  * msqids from sysv_msg.c;
  * sema from sysv_sem.c; and
  * shmsegs from sysv_shm.c;

These will be used by ipcs(1) in non-kvm mode.

Reviewed by:	tmm
2001-05-30 03:28:59 +00:00
Dima Dorfman
028f979d1d Correct style bugs with regards to long lines and comments.
Reviewed by:	bde
2001-05-23 23:38:05 +00:00
Dima Dorfman
a8dbafbe87 Correct the vm_mtx handling; specifically, don't acquire it in
shm_deallocate_segment because shmexit_myhook calls it, and the latter
should always be called with it already held.

Submitted by:	dwmalone, dd
Approved by:	alfred
2001-05-22 03:56:26 +00:00
John Baldwin
9dceb26b23 Sort includes. 2001-05-21 18:52:02 +00:00
Alfred Perlstein
67d1f21cbe Aquire vm mutex when releasing sysv shm segments.
Obtained from: Dima Dorfman <dima@unixfreak.org>
2001-05-20 20:37:47 +00:00
Alfred Perlstein
2395531439 Introduce a global lock for the vm subsystem (vm_mtx).
vm_mtx does not recurse and is required for most low level
vm operations.

faults can not be taken without holding Giant.

Memory subsystems can now call the base page allocators safely.

Almost all atomic ops were removed as they are covered under the
vm mutex.

Alpha and ia64 now need to catch up to i386's trap handlers.

FFS and NFS have been tested, other filesystems will need minor
changes (grabbing the vm lock when twiddling page properties).

Reviewed (partially) by: jake, jhb
2001-05-19 01:28:09 +00:00
Matthew Dillon
1766b2e5fa Raise the SysV shared memory defaults to more reasonable values.
Mainly increases the shared memory limit from 4M to 32M (approx).
Many more programs these days use SysV shared memory, especially X-related
programs.
2001-05-04 18:43:19 +00:00
Mark Murray
fb919e4d5a Undo part of the tangle of having sys/lock.h and sys/mutex.h included in
other "system" header files.

Also help the deprecation of lockmgr.h by making it a sub-include of
sys/lock.h and removing sys/lockmgr.h form kernel .c files.

Sort sys/*.h includes where possible in affected files.

OK'ed by:	bde (with reservations)
2001-05-01 08:13:21 +00:00
Robert Watson
91421ba234 o Move per-process jail pointer (p->pr_prison) to inside of the subject
credential structure, ucred (cr->cr_prison).
o Allow jail inheritence to be a function of credential inheritence.
o Abstract prison structure reference counting behind pr_hold() and
  pr_free(), invoked by the similarly named credential reference
  management functions, removing this code from per-ABI fork/exit code.
o Modify various jail() functions to use struct ucred arguments instead
  of struct proc arguments.
o Introduce jailed() function to determine if a credential is jailed,
  rather than directly checking pointers all over the place.
o Convert PRISON_CHECK() macro to prison_check() function.
o Move jail() function prototypes to jail.h.
o Emulate the P_JAILED flag in fill_kinfo_proc() and no longer set the
  flag in the process flags field itself.
o Eliminate that "const" qualifier from suser/p_can/etc to reflect
  mutex use.

Notes:

o Some further cleanup of the linux/jail code is still required.
o It's now possible to consider resolving some of the process vs
  credential based permission checking confusion in the socket code.
o Mutex protection of struct prison is still not present, and is
  required to protect the reference count plus some fields in the
  structure.

Reviewed by:	freebsd-arch
Obtained from:	TrustedBSD Project
2001-02-21 06:39:57 +00:00
Brian Feldman
a02f31364e It is _DEFINITELY_ not okay to change shmseg on a running system. 2001-02-04 20:10:32 +00:00
Dag-Erling Smørgrav
faa784b70c Use predictable internal names for the sysvipc modules, so we have a
chance of getting dependencies working.
2001-01-14 18:04:30 +00:00
Alfred Perlstein
78525ce318 sysvipc loadable.
new syscall entry lkmressys - "reserved loadable syscall"

Make syscall_register allow overwriting of such entries (lkmressys).
2000-12-01 08:57:47 +00:00
Robert Watson
cb1f0db9db o Deny access to System V IPC from within jail by default, as in the
current implementation, jail neither virtualizes the Sys V IPC namespace,
  nor provides inter-jail protections on IPC objects.
o Support for System V IPC can be enabled by setting jail.sysvipc_allowed=1
  using sysctl.
o This is not the "real fix" which involves virtualizing the System V
  IPC namespace, but prevents processes within jail from influencing those
  outside of jail when not approved by the administrator.

Reported by:	Paulo Fragoso <paulo@nlink.com.br>
2000-10-31 01:34:00 +00:00
Matthew Dillon
8b03c8ed5e This is a cleanup patch to Peter's new OBJT_PHYS VM object type
and sysv shared memory support for it.  It implements a new
    PG_UNMANAGED flag that has slightly different characteristics
    from PG_FICTICIOUS.

    A new sysctl, kern.ipc.shm_use_phys has been added to enable the
    use of physically-backed sysv shared memory rather then swap-backed.
    Physically backed shm segments are not tracked with PV entries,
    allowing programs which use a large shm segment as a rendezvous
    point to operate without eating an insane amount of KVM in the
    PV entry management.  Read: Oracle.

    Peter's OBJT_PHYS object will also allow us to eventually implement
    page-table sharing and/or 4MB physical page support for such segments.
    We're half way there.
2000-05-29 22:40:54 +00:00
Peter Wemm
24488c7498 Provide a temporary undocumented option: SHM_PHYS_BACKED. This will
become sysctl and/or flags controlled later.  It's mainly here for an
easy place to test the physical memory backed objects.
2000-05-21 13:52:13 +00:00
Peter Wemm
255108f385 Make sysv-style shared memory tuneable params fully runtime adjustable
via sysctl.  It's done pretty simply but it should be quite adequate.
Also move SHMMAXPGS from $machine/include/vmparam.h as the comments that
went with it were wrong... we don't allocate KVM space for the pages so
that comment is bogus..  The only practical limit is how much physical
ram you want to lock up as this stuff isn't paged out or swap backed.
2000-03-30 07:17:05 +00:00
Alan Cox
af25d10c91 shmat: If VM_PROT_READ_IS_EXEC is defined and prot includes VM_PROT_READ,
VM_PROT_EXECUTE must be added to prot before calling vm_map_find.

Without this change, an mprotect on a shmat'ed region fails (when
it shouldn't).  This bug was reported Feb 28 by Brooks Davis
<brooks@one-eyed-alien.net> on -hackers.

Reviewed by:	bde
Approved by:	jkh
2000-03-10 09:11:24 +00:00
Poul-Henning Kamp
923502ff91 useracc() the prequel:
Merge the contents (less some trivial bordering the silly comments)
of <vm/vm_prot.h> and <vm/vm_inherit.h> into <vm/vm.h>.  This puts
the #defines for the vm_inherit_t and vm_prot_t types next to their
typedefs.

This paves the road for the commit to follow shortly: change
useracc() to use VM_PROT_{READ|WRITE} rather than B_{READ|WRITE}
as argument.
1999-10-29 18:09:36 +00:00
Peter Wemm
c3aac50f28 $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
Alan Cox
dc92aa57fd For consistency with other implementations, check for the existence
of the segment before checking its permissions.

PR:		kern/11999
Submitted by:	Brooks Davis <brooks@one-eyed-alien.net>
1999-06-19 23:53:13 +00:00
Poul-Henning Kamp
1c308b817a Change suser_xxx() to suser() where it applies. 1999-04-27 12:21:16 +00:00
Matthew Dillon
1c7c3c6a86 This is a rather large commit that encompasses the new swapper,
changes to the VM system to support the new swapper, VM bug
    fixes, several VM optimizations, and some additional revamping of the
    VM code.  The specific bug fixes will be documented with additional
    forced commits.  This commit is somewhat rough in regards to code
    cleanup issues.

Reviewed by:	"John S. Dyson" <root@dyson.iquest.net>, "David Greenman" <dg@root.com>
1999-01-21 08:29:12 +00:00
David Greenman
6cde7a165f Fixed two potentially serious classes of bugs:
1) The vnode pager wasn't properly tracking the file size due to
   "size" being page rounded in some cases and not in others.
   This sometimes resulted in corrupted files. First noticed by
   Terry Lambert.
   Fixed by changing the "size" pager_alloc parameter to be a 64bit
   byte value (as opposed to a 32bit page index) and changing the
   pagers and their callers to deal with this properly.
2) Fixed a bogus type cast in round_page() and trunc_page() that
   caused some 64bit offsets and sizes to be scrambled. Removing
   the cast required adding casts at a few dozen callers.
   There may be problems with other bogus casts in close-by
   macros. A quick check seemed to indicate that those were okay,
   however.
1998-10-13 08:24:45 +00:00
Doug Rabson
069e9bc1b4 Change various syscalls to use size_t arguments instead of u_int.
Add some overflow checks to read/write (from bde).

Change all modifications to vm_page::flags, vm_page::busy, vm_object::flags
and vm_object::paging_in_progress to use operations which are not
interruptable.

Reviewed by: Bruce Evans <bde@zeta.org.au>
1998-08-24 08:39:39 +00:00
John Dyson
96fb8cf258 Fix the shm panic. I mistakenly used the shadow_count to keep the object
from being split, and instead added an OBJ_NOSPLIT.
1998-05-04 17:12:53 +00:00
John Dyson
cbd8ec0902 Work around some VM bugs, the worst being an overly aggressive
swap space free calculation.  More complete fixes will be forthcoming,
in a week.
1998-05-04 03:01:44 +00:00
Poul-Henning Kamp
227ee8a188 Eradicate the variable "time" from the kernel, using various measures.
"time" wasn't a atomic variable, so splfoo() protection were needed
around any access to it, unless you just wanted the seconds part.

Most uses of time.tv_sec now uses the new variable time_second instead.

gettime() changed to getmicrotime(0.

Remove a couple of unneeded splfoo() protections, the new getmicrotime()
is atomic, (until Bruce sets a breakpoint in it).

A couple of places needed random data, so use read_random() instead
of mucking about with time which isn't random.

Add a new nfs_curusec() function.

Mark a couple of bogosities involving the now disappeard time variable.

Update ffs_update() to avoid the weird "== &time" checks, by fixing the
one remaining call that passwd &time as args.

Change profiling in ncr.c to use ticks instead of time.  Resolution is
the same.

Add new function "tvtohz()" to avoid the bogus "splfoo(), add time, call
hzto() which subtracts time" sequences.

Reviewed by:	bde
1998-03-30 09:56:58 +00:00