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freebsd-dev/sys/kern
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Robert Watson 0d9ce3a1ac Introduce a subsystem lock around UNIX domain sockets in order to protect 
global and allocated variables.  This strategy is derived from work
originally developed by BSDi for BSD/OS, and applied to FreeBSD by Sam
Leffler:

- Add unp_mtx, a global mutex which will protect all UNIX domain socket
  related variables, structures, etc.

- Add UNP_LOCK(), UNP_UNLOCK(), UNP_LOCK_ASSERT() macros.

- Acquire unp_mtx on entering most UNIX domain socket code,
  drop/re-acquire around calls into VFS, and release it on return.

- Avoid performing sodupsockaddr() while holding the mutex, so in general
  move to allocating storage before acquiring the mutex to copy the data.

- Make a stack copy of the xucred rather than copying out while holding
  unp_mtx.  Copy the peer credential out after releasing the mutex.

- Add additional assertions of vnode locks following VOP_CREATE().

A few notes:

- Use of an sx lock for the file list mutex may cause problems with regard
  to unp_mtx when garbage collection passed file descriptors.

- The locking in unp_pcblist() for sysctl monitoring is correct subject to
  the unpcb zone not returning memory for reuse by other subsystems
  (consistent with similar existing concerns).

- Sam's version of this change, as with the BSD/OS version, made use of
  both a global lock and per-unpcb locks.  However, in practice, the
  global lock covered all accesses, so I have simplified out the unpcb
  locks in the interest of getting this merged faster (reducing the
  overhead but not sacrificing granularity in most cases).  We will want
  to explore possibilities for improving lock granularity in this code in
  the future.

Submitted by:	sam
Sponsored by:	FreeBSD Foundatiuon
Obtained from:	BSD/OS 5 snapshot provided by BSDi
2004-06-10 21:34:38 +00:00
..
bus_if.m Introduce BUS_CONFIG_INTR(). The method allows devices to tell parents 2003-09-10 21:37:10 +00:00
clock_if.m
device_if.m
genassym.sh
imgact_aout.c Change the types of vn_rdwr_inchunks()'s len and aresid arguments to 2004-06-05 02:18:28 +00:00
imgact_elf32.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
imgact_elf64.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
imgact_elf.c Change the types of vn_rdwr_inchunks()'s len and aresid arguments to 2004-06-05 02:18:28 +00:00
imgact_gzip.c Locking for the per-process resource limits structure. 2004-02-04 21:52:57 +00:00
imgact_shell.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
inflate.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
init_main.c Loudly announce WITNESS and DIAGNOSTIC options and warn about reduced 2004-02-29 16:56:54 +00:00
init_sysent.c Regen. 2004-04-05 10:17:23 +00:00
kern_acct.c Fixed some style bugs (mainly misplaced comments, and totally disordered 2004-03-04 09:47:09 +00:00
kern_acl.c Update my personal copyrights and NETA copyrights in the kernel 2004-02-22 00:33:12 +00:00
kern_alq.c Allow MAC policies to block/revoke kern_alq write access to a file. 2003-10-25 16:10:41 +00:00
kern_clock.c Remove a redundant "td = curthread" statement from profclock(). 2004-06-02 12:05:06 +00:00
kern_condvar.c Associate a simple count of waiters with each condition variable. The 2004-04-06 19:17:46 +00:00
kern_conf.c Introduce a ttyioctl() cdevsw default function. 2004-06-01 13:39:02 +00:00
kern_context.c Change the clear_ret argument of get_mcontext() to be a flags argument. 2003-11-09 20:31:04 +00:00
kern_descrip.c Push the VOP_ADVLOCK() call to release advisory locks on vnode file 2004-06-01 18:03:20 +00:00
kern_environment.c If the buffer supplied to kenv(KENV_DUMP, ...) isn't big enough, 2004-04-28 01:27:33 +00:00
kern_event.c Add GIANT_REQUIRED to kqueue_close(), since kqueue currently requires 2004-06-01 18:05:41 +00:00
kern_exec.c Move TDF_SA from td_flags to td_pflags (and rename it accordingly) 2004-06-02 07:52:36 +00:00
kern_exit.c Remove remnants of PGINPROF. 2004-06-08 10:37:30 +00:00
kern_fork.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
kern_idle.c Always set a process' state to normal when it is fully constructed in 2004-02-05 21:01:37 +00:00
kern_intr.c Detect interrupt storms better. The storm detection didn't work at all 2004-06-05 18:27:28 +00:00
kern_jail.c Fix sysctl name: security.jail.getfsstate_getfsstatroot_only -> 2004-05-20 05:28:44 +00:00
kern_kse.c Move the KSE ABI specific code here and separate it from code that 2004-06-07 07:25:03 +00:00
kern_kthread.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_ktr.c Update the license on this file to be a bit more sane. 2003-09-10 01:09:32 +00:00
kern_ktrace.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
kern_linker.c Since we go to the trouble of compiling the kobj ops table for each class, 2004-05-17 21:24:39 +00:00
kern_lock.c Move TDF_DEADLKTREAT into td_pflags (and rename it accordingly) to avoid 2004-06-03 01:47:37 +00:00
kern_lockf.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
kern_mac.c Add /* !MAC */ to final #endif. 2004-05-03 22:54:46 +00:00
kern_malloc.c Bring in mbuma to replace mballoc. 2004-05-31 21:46:06 +00:00
kern_mbuf.c Fix a couple of bugs in the mbuf and packet ctors. In the latter case, 2004-06-01 16:17:10 +00:00
kern_mib.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
kern_module.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_mtxpool.c Rearrange the SYSINIT order to call lockmgr_init() earlier so that 2003-07-16 01:00:39 +00:00
kern_mutex.c Add a new kernel option MUTEX_WAKE_ALL that changes the mutex unlock code 2004-04-06 19:12:24 +00:00
kern_ntptime.c Annual NTP kernel code spring-cleaning: 2004-03-14 15:23:05 +00:00
kern_physio.c Send B_PHYS out to pasture, it no longer serves any function. 2003-11-15 09:28:09 +00:00
kern_poll.c Ensure that the poll_burst <= poll_burst_max constraint really holds. 2004-04-15 07:38:44 +00:00
kern_proc.c Reference count struct tty. 2004-06-09 09:41:30 +00:00
kern_prot.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
kern_resource.c Fix rtprio() to do sensible things when called from threaded processes. 2004-05-08 08:56:05 +00:00
kern_sema.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_shutdown.c Remove filename+line number from panic messages. 2004-06-06 21:26:49 +00:00
kern_sig.c According to SUSv3, sigwait is different with sigwaitinfo, sigwait 2004-06-07 13:35:02 +00:00
kern_subr.c Remove checks for curthread == NULL - it can't happen. 2004-06-03 10:22:47 +00:00
kern_switch.c - style fixes to the critical_exit() KASSERT(). 2004-02-02 08:13:27 +00:00
kern_sx.c Fix _sx_assert() to panic() rather than printf() when an assertion fails 2004-02-27 16:13:44 +00:00
kern_synch.c Remove a stale and misleading comment. 2004-06-07 09:35:00 +00:00
kern_syscalls.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_sysctl.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
kern_tc.c Just because the timecounter reads the same value on two samples 2004-03-04 14:14:23 +00:00
kern_thr.c If you're trying to find out if a thread is valid and in 2004-04-19 14:20:01 +00:00
kern_thread.c Add a comment explaining td_critnest's initial state and its life from that 2004-06-09 14:06:44 +00:00
kern_time.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
kern_timeout.c The paper "Hashed Timers and Hierarchical Wheels: Data Structures for the 2004-04-25 04:10:17 +00:00
kern_umtx.c Use the proc lock to sleep on a libthr umtx. 2004-03-27 14:32:03 +00:00
kern_uuid.c Fix generation of random multicast MAC address. 2004-01-22 13:34:11 +00:00
kern_xxx.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
ksched.c sched_setscheduler: Return EINVAL when a invalid policy is specified, 2003-09-13 18:46:24 +00:00
link_elf_obj.c If a symbol has section+offset definitions provided, always use instead 2004-05-18 05:15:43 +00:00
link_elf.c Include <sys/gmon.h> instead of <machine/profile.h> for the declaration 2004-05-19 14:36:38 +00:00
linker_if.m The method link_preload_finish is not static. 2003-09-20 17:39:32 +00:00
Make.tags.inc Finish driving a stake through the heart of netns and the associated 2003-03-05 19:24:24 +00:00
Makefile Finish driving a stake through the heart of netns and the associated 2003-03-05 19:24:24 +00:00
makesyscalls.sh Remove the namespace column from the syscalls tables. We don't actually 2003-12-23 03:50:43 +00:00
md4c.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
md5c.c Revert stuff which accidentally ended up in the previous commit. 2003-07-22 10:36:36 +00:00
p1003_1b.c Use __FBSDID(). 2003-06-11 06:34:30 +00:00
posix4_mib.c Use __FBSDID(). 2003-06-11 06:34:30 +00:00
sched_4bsd.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
sched_ule.c - Run sched_balance() and sched_balance_groups() from hardclock via 2004-06-02 05:46:48 +00:00
subr_acl_posix1e.c Update my personal copyrights and NETA copyrights in the kernel 2004-02-22 00:33:12 +00:00
subr_autoconf.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
subr_blist.c Move the definitions of SWAPBLK_NONE and SWAPBLK_MASK from vm_page.h to 2004-06-04 04:03:26 +00:00
subr_bus.c When we don't have any meaningful value to print for the device sysctl 2004-06-05 11:39:05 +00:00
subr_clist.c Revert stuff which accidentally ended up in the previous commit. 2003-07-22 10:36:36 +00:00
subr_clock.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
subr_devstat.c Device megapatch 4/6: 2004-02-21 21:10:55 +00:00
subr_disk.c Report bio_pblkbo instead of bio_blkno. 2003-10-18 17:27:10 +00:00
subr_eventhandler.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_hints.c Add a resource_disabled() helper function that returns true (non-zero) if 2003-07-02 16:01:38 +00:00
subr_kobj.c * Add multiple inheritance to kobj. Each class can have zero or more base 2003-10-16 09:16:28 +00:00
subr_log.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
subr_mbpool.c Pass MTX_DEF as the last argument to mtx_init() instead of 0. This 2003-12-07 21:53:41 +00:00
subr_mchain.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
subr_module.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_msgbuf.c Put the message about msgbuf cksum mismatch under bootverbose and tell 2003-09-05 11:12:00 +00:00
subr_param.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
subr_pcpu.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_power.c Move the kernel power change printf under bootverbose since the 2004-01-02 18:24:13 +00:00
subr_prf.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
subr_prof.c Enable MI bits for gcc -ftest-coverage -fprofile-arcs on amd64. 2004-05-29 01:18:14 +00:00
subr_rman.c Fix off by one error, twice. 2004-04-12 23:02:21 +00:00
subr_rtc.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
subr_sbuf.c Mechanical whistespace cleanup. 2004-02-17 10:21:03 +00:00
subr_scanf.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
subr_sleepqueue.c Fixed some common printf format errors. Don't assume that "struct foo *" 2004-05-14 20:51:42 +00:00
subr_smp.c Move the CPU newbus attachment to i386 legacy. The acpi_cpu device will 2004-05-06 15:54:02 +00:00
subr_taskqueue.c Tidy up the thread taskqueue implementation and close a lost wakeup race. 2004-02-19 22:03:52 +00:00
subr_trap.c Remove unused variable. 2004-03-31 08:20:44 +00:00
subr_turnstile.c Rename turnstile_wakeup() to turnstile_broadcast() to make the naming 2004-04-06 19:07:21 +00:00
subr_witness.c - Comment out NULL, NULL barrier for Unix domain sockets section as the 2004-06-03 20:07:44 +00:00
sys_generic.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
sys_pipe.c Revise the direct or optimized case to use uiomove_fromphys() by the reader 2004-03-27 19:50:23 +00:00
sys_process.c Finish fixing up Alpha to work with an MP safe ptrace(): 2004-04-01 20:56:44 +00:00
sys_socket.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
syscalls.c Regen. 2004-04-05 10:17:23 +00:00
syscalls.master Add lgetfh(2) which is like getfh(2) but doesn't follow symlinks. 2004-04-05 10:15:53 +00:00
sysv_ipc.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
sysv_msg.c Add missing #include <sys/module.h> 2004-05-30 20:34:58 +00:00
sysv_sem.c Add missing #include <sys/module.h> 2004-05-30 20:34:58 +00:00
sysv_shm.c Add missing #include <sys/module.h> 2004-05-30 20:34:58 +00:00
tty_compat.c Compare t_brkc against (char)_POSIX_VDISABLE, not against -1. 2004-05-07 15:35:38 +00:00
tty_conf.c Make linesw[] an array of pointers to linedesc instead of an array of 2004-06-07 20:45:45 +00:00
tty_cons.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
tty_pty.c Rename struct pt_ioctl to "ptsc" and pointers to it from "pti" to "pt" 2004-06-09 10:21:53 +00:00
tty_subr.c Revert stuff which accidentally ended up in the previous commit. 2003-07-22 10:36:36 +00:00
tty_tty.c Device megapatch 4/6: 2004-02-21 21:10:55 +00:00
tty.c Reference count struct tty. 2004-06-09 09:41:30 +00:00
uipc_accf.c Add a global mutex, accept_filter_mtx, to protect the global list of 2004-06-01 04:08:48 +00:00
uipc_cow.c In some cases, sf_buf_alloc() should sleep with pri PCATCH; in others, it 2004-04-03 09:16:27 +00:00
uipc_domain.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
uipc_jumbo.c Lock the vm object when removing a page. 2003-06-11 21:23:04 +00:00
uipc_mbuf2.c Bring in mbuma to replace mballoc. 2004-05-31 21:46:06 +00:00
uipc_mbuf.c Plug a race where upon free this scenario could occur: 2004-06-10 00:04:27 +00:00
uipc_proto.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
uipc_sem.c Add missing #include <sys/module.h> 2004-05-30 20:34:58 +00:00
uipc_sockbuf.c Mark sun_noname as const since it's immutable. Update definitions 2004-06-04 04:07:08 +00:00
uipc_socket2.c Mark sun_noname as const since it's immutable. Update definitions 2004-06-04 04:07:08 +00:00
uipc_socket.c Avoid assignments to cast expressions. 2004-06-08 13:08:19 +00:00
uipc_syscalls.c Correct a resource leak introduced in recent accept locking changes: 2004-06-07 21:45:44 +00:00
uipc_usrreq.c Introduce a subsystem lock around UNIX domain sockets in order to protect 2004-06-10 21:34:38 +00:00
vfs_acl.c Update my personal copyrights and NETA copyrights in the kernel 2004-02-22 00:33:12 +00:00
vfs_aio.c Add missing #include <sys/module.h> 2004-05-30 20:34:58 +00:00
vfs_bio.c Avoid pointless zeroing of the bogus page in vfs_bio_clrbuf(). 2004-05-08 06:46:40 +00:00
vfs_cache.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
vfs_cluster.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
vfs_default.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
vfs_export.c Include <sys/mutex.h> and its prerequisite <sys/lock.h> instesd of depending 2004-04-21 12:10:30 +00:00
vfs_extattr.c Remove unused code. 2004-06-07 12:19:55 +00:00
vfs_init.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
vfs_lookup.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
vfs_mount.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
vfs_subr.c Assert Giant in vrele(). 2004-05-31 19:06:01 +00:00
vfs_syscalls.c Remove unused code. 2004-06-07 12:19:55 +00:00
vfs_vnops.c Change the types of vn_rdwr_inchunks()'s len and aresid arguments to 2004-06-05 02:18:28 +00:00
vnode_if.src Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00