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Make.tags.inc
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Makefile
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bus_if.m
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capabilities.conf
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clock_if.m
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cpufreq_if.m
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device_if.m
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firmw.S
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genassym.sh
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genoffset.c
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genoffset.sh
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imgact_aout.c
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imgact_binmisc.c
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imgact_elf.c
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imgact_elf32.c
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imgact_elf64.c
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imgact_shell.c
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init_main.c
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init_sysent.c
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kern_acct.c
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kern_alq.c
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kern_clock.c
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kern_clocksource.c
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kern_condvar.c
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kern_conf.c
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kern_cons.c
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kern_context.c
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kern_cpu.c
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kern_cpuset.c
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kern_ctf.c
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kern_descrip.c
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kern_dtrace.c
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kern_dump.c
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kern_environment.c
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kern_et.c
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kern_event.c
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kern_exec.c
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kern_exit.c
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kern_fail.c
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kern_ffclock.c
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kern_fork.c
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kern_hhook.c
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kern_idle.c
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kern_intr.c
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kern_jail.c
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kern_kcov.c
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kern_khelp.c
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kern_kthread.c
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kern_ktr.c
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kern_ktrace.c
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kern_linker.c
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kern_lock.c
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kern_lockf.c
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kern_lockstat.c
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kern_loginclass.c
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kern_malloc.c
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kern_mbuf.c
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kern_mib.c
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kern_module.c
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kern_mtxpool.c
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kern_mutex.c
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kern_ntptime.c
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kern_osd.c
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kern_physio.c
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kern_pmc.c
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kern_poll.c
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kern_priv.c
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kern_proc.c
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kern_procctl.c
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kern_prot.c
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kern_racct.c
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kern_rangelock.c
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kern_rctl.c
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kern_resource.c
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kern_rmlock.c
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kern_rwlock.c
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kern_sdt.c
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kern_sema.c
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kern_sendfile.c
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kern_sharedpage.c
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kern_shutdown.c
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kern_sig.c
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kern_switch.c
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kern_sx.c
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kern_synch.c
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kern_syscalls.c
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kern_sysctl.c
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kern_tc.c
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kern_thr.c
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kern_thread.c
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kern_time.c
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kern_timeout.c
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kern_tslog.c
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kern_ubsan.c
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kern_umtx.c
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kern_uuid.c
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kern_xxx.c
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ksched.c
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link_elf.c
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link_elf_obj.c
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linker_if.m
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makesyscalls.sh
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md4c.c
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md5c.c
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msi_if.m
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p1003_1b.c
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pic_if.m
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posix4_mib.c
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sched_4bsd.c
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sched_ule.c
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serdev_if.m
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stack_protector.c
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subr_acl_nfs4.c
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subr_acl_posix1e.c
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subr_atomic64.c
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subr_autoconf.c
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subr_blist.c
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subr_boot.c
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subr_bufring.c
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subr_bus.c
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subr_bus_dma.c
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subr_busdma_bufalloc.c
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subr_capability.c
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subr_clock.c
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subr_compressor.c
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subr_counter.c
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subr_coverage.c
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subr_csan.c
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subr_devmap.c
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subr_devstat.c
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subr_disk.c
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subr_dummy_vdso_tc.c
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subr_early.c
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subr_epoch.c
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subr_eventhandler.c
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subr_fattime.c
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subr_filter.c
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subr_firmware.c
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subr_gtaskqueue.c
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subr_hash.c
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subr_hints.c
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subr_intr.c
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subr_kdb.c
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subr_kobj.c
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subr_lock.c
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subr_log.c
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subr_mchain.c
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subr_module.c
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subr_msgbuf.c
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subr_param.c
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subr_pcpu.c
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subr_pctrie.c
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subr_physmem.c
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subr_pidctrl.c
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subr_power.c
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subr_prf.c
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subr_prng.c
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subr_prof.c
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subr_rangeset.c
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subr_rman.c
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subr_rtc.c
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subr_sbuf.c
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subr_scanf.c
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subr_sfbuf.c
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subr_sglist.c
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subr_sleepqueue.c
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subr_smp.c
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subr_smr.c
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subr_stack.c
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subr_stats.c
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subr_syscall.c
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subr_taskqueue.c
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subr_terminal.c
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subr_trap.c
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subr_turnstile.c
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subr_uio.c
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subr_unit.c
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subr_vmem.c
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subr_witness.c
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sys_capability.c
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sys_eventfd.c
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sys_generic.c
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sys_getrandom.c
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sys_pipe.c
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sys_procdesc.c
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sys_process.c
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sys_socket.c
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syscalls.c
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syscalls.master
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systrace_args.c
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sysv_ipc.c
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sysv_msg.c
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sysv_sem.c
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sysv_shm.c
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tty.c
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tty_compat.c
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tty_info.c
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tty_inq.c
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tty_outq.c
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tty_pts.c
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tty_tty.c
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tty_ttydisc.c
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uipc_accf.c
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uipc_debug.c
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uipc_domain.c
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uipc_ktls.c
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uipc_mbuf.c
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uipc_mbuf2.c
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uipc_mbufhash.c
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uipc_mqueue.c
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uipc_sem.c
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uipc_shm.c
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uipc_sockbuf.c
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uipc_socket.c
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uipc_syscalls.c
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uipc_usrreq.c
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vfs_acl.c
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vfs_aio.c
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vfs_bio.c
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vfs_cache.c
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vfs_cluster.c
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vfs_default.c
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vfs_export.c
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vfs_extattr.c
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vfs_hash.c
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vfs_init.c
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vfs_lookup.c
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vfs_mount.c
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vfs_mountroot.c
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vfs_subr.c
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vfs_syscalls.c
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vfs_vnops.c
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vnode_if.src
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Editing: uipc_sem.c
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org> * Copyright (c) 2003-2005 SPARTA, Inc. * Copyright (c) 2005, 2016-2017 Robert N. M. Watson * All rights reserved. * * This software was developed for the FreeBSD Project in part by Network * Associates Laboratories, the Security Research Division of Network * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), * as part of the DARPA CHATS research program. * * Portions of this software were developed by BAE Systems, the University of * Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL * contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent * Computing (TC) research program. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include "opt_posix.h" #include <sys/param.h> #include <sys/capsicum.h> #include <sys/condvar.h> #include <sys/fcntl.h> #include <sys/file.h> #include <sys/filedesc.h> #include <sys/fnv_hash.h> #include <sys/jail.h> #include <sys/kernel.h> #include <sys/ksem.h> #include <sys/lock.h> #include <sys/malloc.h> #include <sys/module.h> #include <sys/mutex.h> #include <sys/priv.h> #include <sys/proc.h> #include <sys/posix4.h> #include <sys/_semaphore.h> #include <sys/stat.h> #include <sys/syscall.h> #include <sys/syscallsubr.h> #include <sys/sysctl.h> #include <sys/sysent.h> #include <sys/sysproto.h> #include <sys/systm.h> #include <sys/sx.h> #include <sys/user.h> #include <sys/vnode.h> #include <security/audit/audit.h> #include <security/mac/mac_framework.h> FEATURE(p1003_1b_semaphores, "POSIX P1003.1B semaphores support"); /* * TODO * * - Resource limits? * - Replace global sem_lock with mtx_pool locks? * - Add a MAC check_create() hook for creating new named semaphores. */ #ifndef SEM_MAX #define SEM_MAX 30 #endif #ifdef SEM_DEBUG #define DP(x) printf x #else #define DP(x) #endif struct ksem_mapping { char *km_path; Fnv32_t km_fnv; struct ksem *km_ksem; LIST_ENTRY(ksem_mapping) km_link; }; static MALLOC_DEFINE(M_KSEM, "ksem", "semaphore file descriptor"); static LIST_HEAD(, ksem_mapping) *ksem_dictionary; static struct sx ksem_dict_lock; static struct mtx ksem_count_lock; static struct mtx sem_lock; static u_long ksem_hash; static int ksem_dead; #define KSEM_HASH(fnv) (&ksem_dictionary[(fnv) & ksem_hash]) static int nsems = 0; SYSCTL_DECL(_p1003_1b); SYSCTL_INT(_p1003_1b, OID_AUTO, nsems, CTLFLAG_RD, &nsems, 0, "Number of active kernel POSIX semaphores"); static int kern_sem_wait(struct thread *td, semid_t id, int tryflag, struct timespec *abstime); static int ksem_access(struct ksem *ks, struct ucred *ucred); static struct ksem *ksem_alloc(struct ucred *ucred, mode_t mode, unsigned int value); static int ksem_create(struct thread *td, const char *path, semid_t *semidp, mode_t mode, unsigned int value, int flags, int compat32); static void ksem_drop(struct ksem *ks); static int ksem_get(struct thread *td, semid_t id, cap_rights_t *rightsp, struct file **fpp); static struct ksem *ksem_hold(struct ksem *ks); static void ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks); static struct ksem *ksem_lookup(char *path, Fnv32_t fnv); static void ksem_module_destroy(void); static int ksem_module_init(void); static int ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred); static int sem_modload(struct module *module, int cmd, void *arg); static fo_stat_t ksem_stat; static fo_close_t ksem_closef; static fo_chmod_t ksem_chmod; static fo_chown_t ksem_chown; static fo_fill_kinfo_t ksem_fill_kinfo; /* File descriptor operations. */ static struct fileops ksem_ops = { .fo_read = invfo_rdwr, .fo_write = invfo_rdwr, .fo_truncate = invfo_truncate, .fo_ioctl = invfo_ioctl, .fo_poll = invfo_poll, .fo_kqfilter = invfo_kqfilter, .fo_stat = ksem_stat, .fo_close = ksem_closef, .fo_chmod = ksem_chmod, .fo_chown = ksem_chown, .fo_sendfile = invfo_sendfile, .fo_fill_kinfo = ksem_fill_kinfo, .fo_flags = DFLAG_PASSABLE }; FEATURE(posix_sem, "POSIX semaphores"); static int ksem_stat(struct file *fp, struct stat *sb, struct ucred *active_cred, struct thread *td) { struct ksem *ks; #ifdef MAC int error; #endif ks = fp->f_data; #ifdef MAC error = mac_posixsem_check_stat(active_cred, fp->f_cred, ks); if (error) return (error); #endif /* * Attempt to return sanish values for fstat() on a semaphore * file descriptor. */ bzero(sb, sizeof(*sb)); mtx_lock(&sem_lock); sb->st_atim = ks->ks_atime; sb->st_ctim = ks->ks_ctime; sb->st_mtim = ks->ks_mtime; sb->st_birthtim = ks->ks_birthtime; sb->st_uid = ks->ks_uid; sb->st_gid = ks->ks_gid; sb->st_mode = S_IFREG | ks->ks_mode; /* XXX */ mtx_unlock(&sem_lock); return (0); } static int ksem_chmod(struct file *fp, mode_t mode, struct ucred *active_cred, struct thread *td) { struct ksem *ks; int error; error = 0; ks = fp->f_data; mtx_lock(&sem_lock); #ifdef MAC error = mac_posixsem_check_setmode(active_cred, ks, mode); if (error != 0) goto out; #endif error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid, VADMIN, active_cred); if (error != 0) goto out; ks->ks_mode = mode & ACCESSPERMS; out: mtx_unlock(&sem_lock); return (error); } static int ksem_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, struct thread *td) { struct ksem *ks; int error; error = 0; ks = fp->f_data; mtx_lock(&sem_lock); #ifdef MAC error = mac_posixsem_check_setowner(active_cred, ks, uid, gid); if (error != 0) goto out; #endif if (uid == (uid_t)-1) uid = ks->ks_uid; if (gid == (gid_t)-1) gid = ks->ks_gid; if (((uid != ks->ks_uid && uid != active_cred->cr_uid) || (gid != ks->ks_gid && !groupmember(gid, active_cred))) && (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN))) goto out; ks->ks_uid = uid; ks->ks_gid = gid; out: mtx_unlock(&sem_lock); return (error); } static int ksem_closef(struct file *fp, struct thread *td) { struct ksem *ks; ks = fp->f_data; fp->f_data = NULL; ksem_drop(ks); return (0); } static int ksem_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) { const char *path, *pr_path; struct ksem *ks; size_t pr_pathlen; kif->kf_type = KF_TYPE_SEM; ks = fp->f_data; mtx_lock(&sem_lock); kif->kf_un.kf_sem.kf_sem_value = ks->ks_value; kif->kf_un.kf_sem.kf_sem_mode = S_IFREG | ks->ks_mode; /* XXX */ mtx_unlock(&sem_lock); if (ks->ks_path != NULL) { sx_slock(&ksem_dict_lock); if (ks->ks_path != NULL) { path = ks->ks_path; pr_path = curthread->td_ucred->cr_prison->pr_path; if (strcmp(pr_path, "/") != 0) { /* Return the jail-rooted pathname. */ pr_pathlen = strlen(pr_path); if (strncmp(path, pr_path, pr_pathlen) == 0 && path[pr_pathlen] == '/') path += pr_pathlen; } strlcpy(kif->kf_path, path, sizeof(kif->kf_path)); } sx_sunlock(&ksem_dict_lock); } return (0); } /* * ksem object management including creation and reference counting * routines. */ static struct ksem * ksem_alloc(struct ucred *ucred, mode_t mode, unsigned int value) { struct ksem *ks; mtx_lock(&ksem_count_lock); if (nsems == p31b_getcfg(CTL_P1003_1B_SEM_NSEMS_MAX) || ksem_dead) { mtx_unlock(&ksem_count_lock); return (NULL); } nsems++; mtx_unlock(&ksem_count_lock); ks = malloc(sizeof(*ks), M_KSEM, M_WAITOK | M_ZERO); ks->ks_uid = ucred->cr_uid; ks->ks_gid = ucred->cr_gid; ks->ks_mode = mode; ks->ks_value = value; cv_init(&ks->ks_cv, "ksem"); vfs_timestamp(&ks->ks_birthtime); ks->ks_atime = ks->ks_mtime = ks->ks_ctime = ks->ks_birthtime; refcount_init(&ks->ks_ref, 1); #ifdef MAC mac_posixsem_init(ks); mac_posixsem_create(ucred, ks); #endif return (ks); } static struct ksem * ksem_hold(struct ksem *ks) { refcount_acquire(&ks->ks_ref); return (ks); } static void ksem_drop(struct ksem *ks) { if (refcount_release(&ks->ks_ref)) { #ifdef MAC mac_posixsem_destroy(ks); #endif cv_destroy(&ks->ks_cv); free(ks, M_KSEM); mtx_lock(&ksem_count_lock); nsems--; mtx_unlock(&ksem_count_lock); } } /* * Determine if the credentials have sufficient permissions for read * and write access. */ static int ksem_access(struct ksem *ks, struct ucred *ucred) { int error; error = vaccess(VREG, ks->ks_mode, ks->ks_uid, ks->ks_gid, VREAD | VWRITE, ucred); if (error) error = priv_check_cred(ucred, PRIV_SEM_WRITE); return (error); } /* * Dictionary management. We maintain an in-kernel dictionary to map * paths to semaphore objects. We use the FNV hash on the path to * store the mappings in a hash table. */ static struct ksem * ksem_lookup(char *path, Fnv32_t fnv) { struct ksem_mapping *map; LIST_FOREACH(map, KSEM_HASH(fnv), km_link) { if (map->km_fnv != fnv) continue; if (strcmp(map->km_path, path) == 0) return (map->km_ksem); } return (NULL); } static void ksem_insert(char *path, Fnv32_t fnv, struct ksem *ks) { struct ksem_mapping *map; map = malloc(sizeof(struct ksem_mapping), M_KSEM, M_WAITOK); map->km_path = path; map->km_fnv = fnv; map->km_ksem = ksem_hold(ks); ks->ks_path = path; LIST_INSERT_HEAD(KSEM_HASH(fnv), map, km_link); } static int ksem_remove(char *path, Fnv32_t fnv, struct ucred *ucred) { struct ksem_mapping *map; int error; LIST_FOREACH(map, KSEM_HASH(fnv), km_link) { if (map->km_fnv != fnv) continue; if (strcmp(map->km_path, path) == 0) { #ifdef MAC error = mac_posixsem_check_unlink(ucred, map->km_ksem); if (error) return (error); #endif error = ksem_access(map->km_ksem, ucred); if (error) return (error); map->km_ksem->ks_path = NULL; LIST_REMOVE(map, km_link); ksem_drop(map->km_ksem); free(map->km_path, M_KSEM); free(map, M_KSEM); return (0); } } return (ENOENT); } static int ksem_create_copyout_semid(struct thread *td, semid_t *semidp, int fd, int compat32) { semid_t semid; #ifdef COMPAT_FREEBSD32 int32_t semid32; #endif void *ptr; size_t ptrs; #ifdef COMPAT_FREEBSD32 if (compat32) { semid32 = fd; ptr = &semid32; ptrs = sizeof(semid32); } else { #endif semid = fd; ptr = &semid; ptrs = sizeof(semid); compat32 = 0; /* silence gcc */ #ifdef COMPAT_FREEBSD32 } #endif return (copyout(ptr, semidp, ptrs)); } /* Other helper routines. */ static int ksem_create(struct thread *td, const char *name, semid_t *semidp, mode_t mode, unsigned int value, int flags, int compat32) { struct pwddesc *pdp; struct ksem *ks; struct file *fp; char *path; const char *pr_path; size_t pr_pathlen; Fnv32_t fnv; int error, fd; AUDIT_ARG_FFLAGS(flags); AUDIT_ARG_MODE(mode); AUDIT_ARG_VALUE(value); if (value > SEM_VALUE_MAX) return (EINVAL); pdp = td->td_proc->p_pd; mode = (mode & ~pdp->pd_cmask) & ACCESSPERMS; error = falloc(td, &fp, &fd, O_CLOEXEC); if (error) { if (name == NULL) error = ENOSPC; return (error); } /* * Go ahead and copyout the file descriptor now. This is a bit * premature, but it is a lot easier to handle errors as opposed * to later when we've possibly created a new semaphore, etc. */ error = ksem_create_copyout_semid(td, semidp, fd, compat32); if (error) { fdclose(td, fp, fd); fdrop(fp, td); return (error); } if (name == NULL) { /* Create an anonymous semaphore. */ ks = ksem_alloc(td->td_ucred, mode, value); if (ks == NULL) error = ENOSPC; else ks->ks_flags |= KS_ANONYMOUS; } else { path = malloc(MAXPATHLEN, M_KSEM, M_WAITOK); pr_path = td->td_ucred->cr_prison->pr_path; /* Construct a full pathname for jailed callers. */ pr_pathlen = strcmp(pr_path, "/") == 0 ? 0 : strlcpy(path, pr_path, MAXPATHLEN); error = copyinstr(name, path + pr_pathlen, MAXPATHLEN - pr_pathlen, NULL); /* Require paths to start with a '/' character. */ if (error == 0 && path[pr_pathlen] != '/') error = EINVAL; if (error) { fdclose(td, fp, fd); fdrop(fp, td); free(path, M_KSEM); return (error); } AUDIT_ARG_UPATH1_CANON(path); fnv = fnv_32_str(path, FNV1_32_INIT); sx_xlock(&ksem_dict_lock); ks = ksem_lookup(path, fnv); if (ks == NULL) { /* Object does not exist, create it if requested. */ if (flags & O_CREAT) { ks = ksem_alloc(td->td_ucred, mode, value); if (ks == NULL) error = ENFILE; else { ksem_insert(path, fnv, ks); path = NULL; } } else error = ENOENT; } else { /* * Object already exists, obtain a new * reference if requested and permitted. */ if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) error = EEXIST; else { #ifdef MAC error = mac_posixsem_check_open(td->td_ucred, ks); if (error == 0) #endif error = ksem_access(ks, td->td_ucred); } if (error == 0) ksem_hold(ks); #ifdef INVARIANTS else ks = NULL; #endif } sx_xunlock(&ksem_dict_lock); if (path) free(path, M_KSEM); } if (error) { KASSERT(ks == NULL, ("ksem_create error with a ksem")); fdclose(td, fp, fd); fdrop(fp, td); return (error); } KASSERT(ks != NULL, ("ksem_create w/o a ksem")); finit(fp, FREAD | FWRITE, DTYPE_SEM, ks, &ksem_ops); fdrop(fp, td); return (0); } static int ksem_get(struct thread *td, semid_t id, cap_rights_t *rightsp, struct file **fpp) { struct ksem *ks; struct file *fp; int error; error = fget(td, id, rightsp, &fp); if (error) return (EINVAL); if (fp->f_type != DTYPE_SEM) { fdrop(fp, td); return (EINVAL); } ks = fp->f_data; if (ks->ks_flags & KS_DEAD) { fdrop(fp, td); return (EINVAL); } *fpp = fp; return (0); } /* System calls. */ #ifndef _SYS_SYSPROTO_H_ struct ksem_init_args { unsigned int value; semid_t *idp; }; #endif int sys_ksem_init(struct thread *td, struct ksem_init_args *uap) { return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value, 0, 0)); } #ifndef _SYS_SYSPROTO_H_ struct ksem_open_args { char *name; int oflag; mode_t mode; unsigned int value; semid_t *idp; }; #endif int sys_ksem_open(struct thread *td, struct ksem_open_args *uap) { DP((">>> ksem_open start, pid=%d\n", (int)td->td_proc->p_pid)); if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0) return (EINVAL); return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value, uap->oflag, 0)); } #ifndef _SYS_SYSPROTO_H_ struct ksem_unlink_args { char *name; }; #endif int sys_ksem_unlink(struct thread *td, struct ksem_unlink_args *uap) { char *path; const char *pr_path; size_t pr_pathlen; Fnv32_t fnv; int error; path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); pr_path = td->td_ucred->cr_prison->pr_path; pr_pathlen = strcmp(pr_path, "/") == 0 ? 0 : strlcpy(path, pr_path, MAXPATHLEN); error = copyinstr(uap->name, path + pr_pathlen, MAXPATHLEN - pr_pathlen, NULL); if (error) { free(path, M_TEMP); return (error); } AUDIT_ARG_UPATH1_CANON(path); fnv = fnv_32_str(path, FNV1_32_INIT); sx_xlock(&ksem_dict_lock); error = ksem_remove(path, fnv, td->td_ucred); sx_xunlock(&ksem_dict_lock); free(path, M_TEMP); return (error); } #ifndef _SYS_SYSPROTO_H_ struct ksem_close_args { semid_t id; }; #endif int sys_ksem_close(struct thread *td, struct ksem_close_args *uap) { struct ksem *ks; struct file *fp; int error; /* No capability rights required to close a semaphore. */ AUDIT_ARG_FD(uap->id); error = ksem_get(td, uap->id, &cap_no_rights, &fp); if (error) return (error); ks = fp->f_data; if (ks->ks_flags & KS_ANONYMOUS) { fdrop(fp, td); return (EINVAL); } error = kern_close(td, uap->id); fdrop(fp, td); return (error); } #ifndef _SYS_SYSPROTO_H_ struct ksem_post_args { semid_t id; }; #endif int sys_ksem_post(struct thread *td, struct ksem_post_args *uap) { cap_rights_t rights; struct file *fp; struct ksem *ks; int error; AUDIT_ARG_FD(uap->id); error = ksem_get(td, uap->id, cap_rights_init_one(&rights, CAP_SEM_POST), &fp); if (error) return (error); ks = fp->f_data; mtx_lock(&sem_lock); #ifdef MAC error = mac_posixsem_check_post(td->td_ucred, fp->f_cred, ks); if (error) goto err; #endif if (ks->ks_value == SEM_VALUE_MAX) { error = EOVERFLOW; goto err; } ++ks->ks_value; if (ks->ks_waiters > 0) cv_signal(&ks->ks_cv); error = 0; vfs_timestamp(&ks->ks_ctime); err: mtx_unlock(&sem_lock); fdrop(fp, td); return (error); } #ifndef _SYS_SYSPROTO_H_ struct ksem_wait_args { semid_t id; }; #endif int sys_ksem_wait(struct thread *td, struct ksem_wait_args *uap) { return (kern_sem_wait(td, uap->id, 0, NULL)); } #ifndef _SYS_SYSPROTO_H_ struct ksem_timedwait_args { semid_t id; const struct timespec *abstime; }; #endif int sys_ksem_timedwait(struct thread *td, struct ksem_timedwait_args *uap) { struct timespec abstime; struct timespec *ts; int error; /* * We allow a null timespec (wait forever). */ if (uap->abstime == NULL) ts = NULL; else { error = copyin(uap->abstime, &abstime, sizeof(abstime)); if (error != 0) return (error); if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0) return (EINVAL); ts = &abstime; } return (kern_sem_wait(td, uap->id, 0, ts)); } #ifndef _SYS_SYSPROTO_H_ struct ksem_trywait_args { semid_t id; }; #endif int sys_ksem_trywait(struct thread *td, struct ksem_trywait_args *uap) { return (kern_sem_wait(td, uap->id, 1, NULL)); } static int kern_sem_wait(struct thread *td, semid_t id, int tryflag, struct timespec *abstime) { struct timespec ts1, ts2; struct timeval tv; cap_rights_t rights; struct file *fp; struct ksem *ks; int error; DP((">>> kern_sem_wait entered! pid=%d\n", (int)td->td_proc->p_pid)); AUDIT_ARG_FD(id); error = ksem_get(td, id, cap_rights_init_one(&rights, CAP_SEM_WAIT), &fp); if (error) return (error); ks = fp->f_data; mtx_lock(&sem_lock); DP((">>> kern_sem_wait critical section entered! pid=%d\n", (int)td->td_proc->p_pid)); #ifdef MAC error = mac_posixsem_check_wait(td->td_ucred, fp->f_cred, ks); if (error) { DP(("kern_sem_wait mac failed\n")); goto err; } #endif DP(("kern_sem_wait value = %d, tryflag %d\n", ks->ks_value, tryflag)); vfs_timestamp(&ks->ks_atime); while (ks->ks_value == 0) { ks->ks_waiters++; if (tryflag != 0) error = EAGAIN; else if (abstime == NULL) error = cv_wait_sig(&ks->ks_cv, &sem_lock); else { for (;;) { ts1 = *abstime; getnanotime(&ts2); timespecsub(&ts1, &ts2, &ts1); TIMESPEC_TO_TIMEVAL(&tv, &ts1); if (tv.tv_sec < 0) { error = ETIMEDOUT; break; } error = cv_timedwait_sig(&ks->ks_cv, &sem_lock, tvtohz(&tv)); if (error != EWOULDBLOCK) break; } } ks->ks_waiters--; if (error) goto err; } ks->ks_value--; DP(("kern_sem_wait value post-decrement = %d\n", ks->ks_value)); error = 0; err: mtx_unlock(&sem_lock); fdrop(fp, td); DP(("<<< kern_sem_wait leaving, pid=%d, error = %d\n", (int)td->td_proc->p_pid, error)); return (error); } #ifndef _SYS_SYSPROTO_H_ struct ksem_getvalue_args { semid_t id; int *val; }; #endif int sys_ksem_getvalue(struct thread *td, struct ksem_getvalue_args *uap) { cap_rights_t rights; struct file *fp; struct ksem *ks; int error, val; AUDIT_ARG_FD(uap->id); error = ksem_get(td, uap->id, cap_rights_init_one(&rights, CAP_SEM_GETVALUE), &fp); if (error) return (error); ks = fp->f_data; mtx_lock(&sem_lock); #ifdef MAC error = mac_posixsem_check_getvalue(td->td_ucred, fp->f_cred, ks); if (error) { mtx_unlock(&sem_lock); fdrop(fp, td); return (error); } #endif val = ks->ks_value; vfs_timestamp(&ks->ks_atime); mtx_unlock(&sem_lock); fdrop(fp, td); error = copyout(&val, uap->val, sizeof(val)); return (error); } #ifndef _SYS_SYSPROTO_H_ struct ksem_destroy_args { semid_t id; }; #endif int sys_ksem_destroy(struct thread *td, struct ksem_destroy_args *uap) { struct file *fp; struct ksem *ks; int error; /* No capability rights required to close a semaphore. */ AUDIT_ARG_FD(uap->id); error = ksem_get(td, uap->id, &cap_no_rights, &fp); if (error) return (error); ks = fp->f_data; if (!(ks->ks_flags & KS_ANONYMOUS)) { fdrop(fp, td); return (EINVAL); } mtx_lock(&sem_lock); if (ks->ks_waiters != 0) { mtx_unlock(&sem_lock); error = EBUSY; goto err; } ks->ks_flags |= KS_DEAD; mtx_unlock(&sem_lock); error = kern_close(td, uap->id); err: fdrop(fp, td); return (error); } static struct syscall_helper_data ksem_syscalls[] = { SYSCALL_INIT_HELPER(ksem_init), SYSCALL_INIT_HELPER(ksem_open), SYSCALL_INIT_HELPER(ksem_unlink), SYSCALL_INIT_HELPER(ksem_close), SYSCALL_INIT_HELPER(ksem_post), SYSCALL_INIT_HELPER(ksem_wait), SYSCALL_INIT_HELPER(ksem_timedwait), SYSCALL_INIT_HELPER(ksem_trywait), SYSCALL_INIT_HELPER(ksem_getvalue), SYSCALL_INIT_HELPER(ksem_destroy), SYSCALL_INIT_LAST }; #ifdef COMPAT_FREEBSD32 #include <compat/freebsd32/freebsd32.h> #include <compat/freebsd32/freebsd32_proto.h> #include <compat/freebsd32/freebsd32_signal.h> #include <compat/freebsd32/freebsd32_syscall.h> #include <compat/freebsd32/freebsd32_util.h> int freebsd32_ksem_init(struct thread *td, struct freebsd32_ksem_init_args *uap) { return (ksem_create(td, NULL, uap->idp, S_IRWXU | S_IRWXG, uap->value, 0, 1)); } int freebsd32_ksem_open(struct thread *td, struct freebsd32_ksem_open_args *uap) { if ((uap->oflag & ~(O_CREAT | O_EXCL)) != 0) return (EINVAL); return (ksem_create(td, uap->name, uap->idp, uap->mode, uap->value, uap->oflag, 1)); } int freebsd32_ksem_timedwait(struct thread *td, struct freebsd32_ksem_timedwait_args *uap) { struct timespec32 abstime32; struct timespec *ts, abstime; int error; /* * We allow a null timespec (wait forever). */ if (uap->abstime == NULL) ts = NULL; else { error = copyin(uap->abstime, &abstime32, sizeof(abstime32)); if (error != 0) return (error); CP(abstime32, abstime, tv_sec); CP(abstime32, abstime, tv_nsec); if (abstime.tv_nsec >= 1000000000 || abstime.tv_nsec < 0) return (EINVAL); ts = &abstime; } return (kern_sem_wait(td, uap->id, 0, ts)); } static struct syscall_helper_data ksem32_syscalls[] = { SYSCALL32_INIT_HELPER(freebsd32_ksem_init), SYSCALL32_INIT_HELPER(freebsd32_ksem_open), SYSCALL32_INIT_HELPER_COMPAT(ksem_unlink), SYSCALL32_INIT_HELPER_COMPAT(ksem_close), SYSCALL32_INIT_HELPER_COMPAT(ksem_post), SYSCALL32_INIT_HELPER_COMPAT(ksem_wait), SYSCALL32_INIT_HELPER(freebsd32_ksem_timedwait), SYSCALL32_INIT_HELPER_COMPAT(ksem_trywait), SYSCALL32_INIT_HELPER_COMPAT(ksem_getvalue), SYSCALL32_INIT_HELPER_COMPAT(ksem_destroy), SYSCALL_INIT_LAST }; #endif static int ksem_module_init(void) { int error; mtx_init(&sem_lock, "sem", NULL, MTX_DEF); mtx_init(&ksem_count_lock, "ksem count", NULL, MTX_DEF); sx_init(&ksem_dict_lock, "ksem dictionary"); ksem_dictionary = hashinit(1024, M_KSEM, &ksem_hash); p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 200112L); p31b_setcfg(CTL_P1003_1B_SEM_NSEMS_MAX, SEM_MAX); p31b_setcfg(CTL_P1003_1B_SEM_VALUE_MAX, SEM_VALUE_MAX); error = syscall_helper_register(ksem_syscalls, SY_THR_STATIC_KLD); if (error) return (error); #ifdef COMPAT_FREEBSD32 error = syscall32_helper_register(ksem32_syscalls, SY_THR_STATIC_KLD); if (error) return (error); #endif return (0); } static void ksem_module_destroy(void) { #ifdef COMPAT_FREEBSD32 syscall32_helper_unregister(ksem32_syscalls); #endif syscall_helper_unregister(ksem_syscalls); p31b_setcfg(CTL_P1003_1B_SEMAPHORES, 0); hashdestroy(ksem_dictionary, M_KSEM, ksem_hash); sx_destroy(&ksem_dict_lock); mtx_destroy(&ksem_count_lock); mtx_destroy(&sem_lock); p31b_unsetcfg(CTL_P1003_1B_SEM_VALUE_MAX); p31b_unsetcfg(CTL_P1003_1B_SEM_NSEMS_MAX); } static int sem_modload(struct module *module, int cmd, void *arg) { int error = 0; switch (cmd) { case MOD_LOAD: error = ksem_module_init(); if (error) ksem_module_destroy(); break; case MOD_UNLOAD: mtx_lock(&ksem_count_lock); if (nsems != 0) { error = EOPNOTSUPP; mtx_unlock(&ksem_count_lock); break; } ksem_dead = 1; mtx_unlock(&ksem_count_lock); ksem_module_destroy(); break; case MOD_SHUTDOWN: break; default: error = EINVAL; break; } return (error); } static moduledata_t sem_mod = { "sem", &sem_modload, NULL }; DECLARE_MODULE(sem, sem_mod, SI_SUB_SYSV_SEM, SI_ORDER_FIRST); MODULE_VERSION(sem, 1);
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