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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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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_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: imgact_binmisc.c
/*- * Copyright (c) 2013-16, Stacey D. Son * All rights reserved. * * 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 <sys/param.h> #include <sys/ctype.h> #include <sys/exec.h> #include <sys/imgact.h> #include <sys/imgact_binmisc.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/malloc.h> #include <sys/mutex.h> #include <sys/sbuf.h> #include <sys/sysctl.h> #include <sys/sx.h> #include <machine/atomic.h> /** * Miscellaneous binary interpreter image activator. * * If the given target executable's header matches 'xbe_magic' field in the * 'interpreter_list' then it will use the user-level interpreter specified in * the 'xbe_interpreter' field to execute the binary. The 'xbe_magic' field may * be adjusted to a given offset using the value in the 'xbe_moffset' field * and bits of the header may be masked using the 'xbe_mask' field. The * 'interpreter_list' entries are managed using sysctl(3) as described in the * <sys/imgact_binmisc.h> file. */ /* * Node of the interpreter list. */ typedef struct imgact_binmisc_entry { SLIST_ENTRY(imgact_binmisc_entry) link; char *ibe_name; uint8_t *ibe_magic; uint8_t *ibe_mask; uint8_t *ibe_interpreter; ssize_t ibe_interp_offset; uint32_t ibe_interp_argcnt; uint32_t ibe_interp_length; uint32_t ibe_argv0_cnt; uint32_t ibe_flags; uint32_t ibe_moffset; uint32_t ibe_msize; } imgact_binmisc_entry_t; /* * sysctl() commands. */ #define IBC_ADD 1 /* Add given entry. */ #define IBC_REMOVE 2 /* Remove entry for a given name. */ #define IBC_DISABLE 3 /* Disable entry for a given name. */ #define IBC_ENABLE 4 /* Enable entry for a given name. */ #define IBC_LOOKUP 5 /* Lookup and return entry for given name. */ #define IBC_LIST 6 /* Get a snapshot of the interpretor list. */ /* * Interpreter string macros. * * They all start with '#' followed by a single letter: */ #define ISM_POUND '#' /* "##" is the escape sequence for single #. */ #define ISM_OLD_ARGV0 'a' /* "#a" is replaced with the old argv0. */ MALLOC_DEFINE(M_BINMISC, KMOD_NAME, "misc binary image activator"); /* The interpreter list. */ static SLIST_HEAD(, imgact_binmisc_entry) interpreter_list = SLIST_HEAD_INITIALIZER(interpreter_list); static int interp_list_entry_count; static struct sx interp_list_sx; #define INTERP_LIST_WLOCK() sx_xlock(&interp_list_sx) #define INTERP_LIST_RLOCK() sx_slock(&interp_list_sx) #define INTERP_LIST_WUNLOCK() sx_xunlock(&interp_list_sx) #define INTERP_LIST_RUNLOCK() sx_sunlock(&interp_list_sx) #define INTERP_LIST_LOCK_INIT() sx_init(&interp_list_sx, KMOD_NAME) #define INTERP_LIST_LOCK_DESTROY() sx_destroy(&interp_list_sx) #define INTERP_LIST_ASSERT_LOCKED() sx_assert(&interp_list_sx, SA_LOCKED) /* * Populate the entry with the information about the interpreter. */ static void imgact_binmisc_populate_interp(char *str, imgact_binmisc_entry_t *ibe) { uint32_t len = 0, argc = 1; char t[IBE_INTERP_LEN_MAX]; char *sp, *tp; memset(t, 0, sizeof(t)); /* * Normalize interpreter string. Replace white space between args with * single space. */ sp = str; tp = t; while (*sp != '\0') { if (*sp == ' ' || *sp == '\t') { if (++len >= IBE_INTERP_LEN_MAX) break; *tp++ = ' '; argc++; while (*sp == ' ' || *sp == '\t') sp++; continue; } else { *tp++ = *sp++; len++; } } *tp = '\0'; len++; ibe->ibe_interpreter = malloc(len, M_BINMISC, M_WAITOK|M_ZERO); /* Populate all the ibe fields for the interpreter. */ memcpy(ibe->ibe_interpreter, t, len); ibe->ibe_interp_argcnt = argc; ibe->ibe_interp_length = len; } /* * Allocate memory and populate a new entry for the interpreter table. */ static imgact_binmisc_entry_t * imgact_binmisc_new_entry(ximgact_binmisc_entry_t *xbe, ssize_t interp_offset, int argv0_cnt) { imgact_binmisc_entry_t *ibe = NULL; size_t namesz = min(strlen(xbe->xbe_name) + 1, IBE_NAME_MAX); ibe = malloc(sizeof(*ibe), M_BINMISC, M_WAITOK|M_ZERO); ibe->ibe_name = malloc(namesz, M_BINMISC, M_WAITOK|M_ZERO); strlcpy(ibe->ibe_name, xbe->xbe_name, namesz); imgact_binmisc_populate_interp(xbe->xbe_interpreter, ibe); ibe->ibe_magic = malloc(xbe->xbe_msize, M_BINMISC, M_WAITOK|M_ZERO); memcpy(ibe->ibe_magic, xbe->xbe_magic, xbe->xbe_msize); ibe->ibe_mask = malloc(xbe->xbe_msize, M_BINMISC, M_WAITOK|M_ZERO); memcpy(ibe->ibe_mask, xbe->xbe_mask, xbe->xbe_msize); ibe->ibe_moffset = xbe->xbe_moffset; ibe->ibe_msize = xbe->xbe_msize; ibe->ibe_flags = xbe->xbe_flags; ibe->ibe_interp_offset = interp_offset; ibe->ibe_argv0_cnt = argv0_cnt; return (ibe); } /* * Free the allocated memory for a given list item. */ static void imgact_binmisc_destroy_entry(imgact_binmisc_entry_t *ibe) { if (!ibe) return; if (ibe->ibe_magic) free(ibe->ibe_magic, M_BINMISC); if (ibe->ibe_mask) free(ibe->ibe_mask, M_BINMISC); if (ibe->ibe_interpreter) free(ibe->ibe_interpreter, M_BINMISC); if (ibe->ibe_name) free(ibe->ibe_name, M_BINMISC); if (ibe) free(ibe, M_BINMISC); } /* * Find the interpreter in the list by the given name. Return NULL if not * found. */ static imgact_binmisc_entry_t * imgact_binmisc_find_entry(char *name) { imgact_binmisc_entry_t *ibe; INTERP_LIST_ASSERT_LOCKED(); SLIST_FOREACH(ibe, &interpreter_list, link) { if (strncmp(name, ibe->ibe_name, IBE_NAME_MAX) == 0) return (ibe); } return (NULL); } /* * Add the given interpreter if it doesn't already exist. Return EEXIST * if the name already exist in the interpreter list. */ static int imgact_binmisc_add_entry(ximgact_binmisc_entry_t *xbe) { imgact_binmisc_entry_t *ibe; char *p; ssize_t interp_offset; int argv0_cnt, cnt; if (xbe->xbe_msize > IBE_MAGIC_MAX) return (EINVAL); if (xbe->xbe_moffset + xbe->xbe_msize > IBE_MATCH_MAX) return (EINVAL); for(cnt = 0, p = xbe->xbe_name; *p != 0; cnt++, p++) if (cnt >= IBE_NAME_MAX || !isascii((int)*p)) return (EINVAL); for(cnt = 0, p = xbe->xbe_interpreter; *p != 0; cnt++, p++) if (cnt >= IBE_INTERP_LEN_MAX || !isascii((int)*p)) return (EINVAL); /* Make sure we don't have any invalid #'s. */ p = xbe->xbe_interpreter; interp_offset = 0; argv0_cnt = 0; while ((p = strchr(p, '#')) != NULL) { p++; switch(*p) { case ISM_POUND: /* "##" */ p++; interp_offset--; break; case ISM_OLD_ARGV0: /* "#a" */ p++; argv0_cnt++; break; case 0: default: /* Anything besides the above is invalid. */ return (EINVAL); } } INTERP_LIST_WLOCK(); if (imgact_binmisc_find_entry(xbe->xbe_name) != NULL) { INTERP_LIST_WUNLOCK(); return (EEXIST); } /* Preallocate a new entry. */ ibe = imgact_binmisc_new_entry(xbe, interp_offset, argv0_cnt); SLIST_INSERT_HEAD(&interpreter_list, ibe, link); interp_list_entry_count++; INTERP_LIST_WUNLOCK(); return (0); } /* * Remove the interpreter in the list with the given name. Return ENOENT * if not found. */ static int imgact_binmisc_remove_entry(char *name) { imgact_binmisc_entry_t *ibe; INTERP_LIST_WLOCK(); if ((ibe = imgact_binmisc_find_entry(name)) == NULL) { INTERP_LIST_WUNLOCK(); return (ENOENT); } SLIST_REMOVE(&interpreter_list, ibe, imgact_binmisc_entry, link); interp_list_entry_count--; INTERP_LIST_WUNLOCK(); imgact_binmisc_destroy_entry(ibe); return (0); } /* * Disable the interpreter in the list with the given name. Return ENOENT * if not found. */ static int imgact_binmisc_disable_entry(char *name) { imgact_binmisc_entry_t *ibe; INTERP_LIST_WLOCK(); if ((ibe = imgact_binmisc_find_entry(name)) == NULL) { INTERP_LIST_WUNLOCK(); return (ENOENT); } ibe->ibe_flags &= ~IBF_ENABLED; INTERP_LIST_WUNLOCK(); return (0); } /* * Enable the interpreter in the list with the given name. Return ENOENT * if not found. */ static int imgact_binmisc_enable_entry(char *name) { imgact_binmisc_entry_t *ibe; INTERP_LIST_WLOCK(); if ((ibe = imgact_binmisc_find_entry(name)) == NULL) { INTERP_LIST_WUNLOCK(); return (ENOENT); } ibe->ibe_flags |= IBF_ENABLED; INTERP_LIST_WUNLOCK(); return (0); } static int imgact_binmisc_populate_xbe(ximgact_binmisc_entry_t *xbe, imgact_binmisc_entry_t *ibe) { uint32_t i; INTERP_LIST_ASSERT_LOCKED(); memset(xbe, 0, sizeof(*xbe)); strlcpy(xbe->xbe_name, ibe->ibe_name, IBE_NAME_MAX); /* Copy interpreter string. Replace NULL breaks with space. */ memcpy(xbe->xbe_interpreter, ibe->ibe_interpreter, ibe->ibe_interp_length); for(i = 0; i < (ibe->ibe_interp_length - 1); i++) if (xbe->xbe_interpreter[i] == '\0') xbe->xbe_interpreter[i] = ' '; memcpy(xbe->xbe_magic, ibe->ibe_magic, ibe->ibe_msize); memcpy(xbe->xbe_mask, ibe->ibe_mask, ibe->ibe_msize); xbe->xbe_version = IBE_VERSION; xbe->xbe_flags = ibe->ibe_flags; xbe->xbe_moffset = ibe->ibe_moffset; xbe->xbe_msize = ibe->ibe_msize; return (0); } /* * Retrieve the interpreter with the give name and populate the * ximgact_binmisc_entry structure. Return ENOENT if not found. */ static int imgact_binmisc_lookup_entry(char *name, ximgact_binmisc_entry_t *xbe) { imgact_binmisc_entry_t *ibe; int error = 0; INTERP_LIST_RLOCK(); if ((ibe = imgact_binmisc_find_entry(name)) == NULL) { INTERP_LIST_RUNLOCK(); return (ENOENT); } error = imgact_binmisc_populate_xbe(xbe, ibe); INTERP_LIST_RUNLOCK(); return (error); } /* * Get a snapshot of all the interpreter entries in the list. */ static int imgact_binmisc_get_all_entries(struct sysctl_req *req) { ximgact_binmisc_entry_t *xbe, *xbep; imgact_binmisc_entry_t *ibe; int error = 0, count; INTERP_LIST_RLOCK(); count = interp_list_entry_count; xbe = malloc(sizeof(*xbe) * count, M_BINMISC, M_WAITOK|M_ZERO); xbep = xbe; SLIST_FOREACH(ibe, &interpreter_list, link) { error = imgact_binmisc_populate_xbe(xbep++, ibe); if (error) break; } INTERP_LIST_RUNLOCK(); if (!error) error = SYSCTL_OUT(req, xbe, sizeof(*xbe) * count); free(xbe, M_BINMISC); return (error); } /* * sysctl() handler for munipulating interpretor table. * Not MP safe (locked by sysctl). */ static int sysctl_kern_binmisc(SYSCTL_HANDLER_ARGS) { ximgact_binmisc_entry_t xbe; int error = 0; switch(arg2) { case IBC_ADD: /* Add an entry. Limited to IBE_MAX_ENTRIES. */ error = SYSCTL_IN(req, &xbe, sizeof(xbe)); if (error) return (error); if (IBE_VERSION != xbe.xbe_version) return (EINVAL); if ((xbe.xbe_flags & ~IBF_VALID_UFLAGS) != 0) return (EINVAL); if (interp_list_entry_count == IBE_MAX_ENTRIES) return (ENOSPC); error = imgact_binmisc_add_entry(&xbe); break; case IBC_REMOVE: /* Remove an entry. */ error = SYSCTL_IN(req, &xbe, sizeof(xbe)); if (error) return (error); if (IBE_VERSION != xbe.xbe_version) return (EINVAL); error = imgact_binmisc_remove_entry(xbe.xbe_name); break; case IBC_DISABLE: /* Disable an entry. */ error = SYSCTL_IN(req, &xbe, sizeof(xbe)); if (error) return (error); if (IBE_VERSION != xbe.xbe_version) return (EINVAL); error = imgact_binmisc_disable_entry(xbe.xbe_name); break; case IBC_ENABLE: /* Enable an entry. */ error = SYSCTL_IN(req, &xbe, sizeof(xbe)); if (error) return (error); if (IBE_VERSION != xbe.xbe_version) return (EINVAL); error = imgact_binmisc_enable_entry(xbe.xbe_name); break; case IBC_LOOKUP: /* Lookup an entry. */ error = SYSCTL_IN(req, &xbe, sizeof(xbe)); if (error) return (error); if (IBE_VERSION != xbe.xbe_version) return (EINVAL); error = imgact_binmisc_lookup_entry(xbe.xbe_name, &xbe); if (!error) error = SYSCTL_OUT(req, &xbe, sizeof(xbe)); break; case IBC_LIST: /* Return a snapshot of the interpretor list. */ if (!req->oldptr) { /* No pointer then just return the list size. */ error = SYSCTL_OUT(req, 0, interp_list_entry_count * sizeof(ximgact_binmisc_entry_t)); return (error); } else if (!req->oldlen) return (EINVAL); error = imgact_binmisc_get_all_entries(req); break; default: return (EINVAL); } return (error); } SYSCTL_NODE(_kern, OID_AUTO, binmisc, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, "Image activator for miscellaneous binaries"); SYSCTL_PROC(_kern_binmisc, OID_AUTO, add, CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_ADD, sysctl_kern_binmisc, "S,ximgact_binmisc_entry", "Add an activator entry"); SYSCTL_PROC(_kern_binmisc, OID_AUTO, remove, CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_REMOVE, sysctl_kern_binmisc, "S,ximgact_binmisc_entry", "Remove an activator entry"); SYSCTL_PROC(_kern_binmisc, OID_AUTO, disable, CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_DISABLE, sysctl_kern_binmisc, "S,ximgact_binmisc_entry", "Disable an activator entry"); SYSCTL_PROC(_kern_binmisc, OID_AUTO, enable, CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_ENABLE, sysctl_kern_binmisc, "S,ximgact_binmisc_entry", "Enable an activator entry"); SYSCTL_PROC(_kern_binmisc, OID_AUTO, lookup, CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_RW|CTLFLAG_ANYBODY, NULL, IBC_LOOKUP, sysctl_kern_binmisc, "S,ximgact_binmisc_entry", "Lookup an activator entry"); SYSCTL_PROC(_kern_binmisc, OID_AUTO, list, CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_RD|CTLFLAG_ANYBODY, NULL, IBC_LIST, sysctl_kern_binmisc, "S,ximgact_binmisc_entry", "Get snapshot of all the activator entries"); static imgact_binmisc_entry_t * imgact_binmisc_find_interpreter(const char *image_header) { imgact_binmisc_entry_t *ibe; const char *p; int i; size_t sz; INTERP_LIST_ASSERT_LOCKED(); SLIST_FOREACH(ibe, &interpreter_list, link) { if (!(IBF_ENABLED & ibe->ibe_flags)) continue; p = image_header + ibe->ibe_moffset; sz = ibe->ibe_msize; if (IBF_USE_MASK & ibe->ibe_flags) { /* Compare using mask. */ for (i = 0; i < sz; i++) if ((*p++ ^ ibe->ibe_magic[i]) & ibe->ibe_mask[i]) break; } else { for (i = 0; i < sz; i++) if (*p++ ^ ibe->ibe_magic[i]) break; } if (i == ibe->ibe_msize) return (ibe); } return (NULL); } static int imgact_binmisc_exec(struct image_params *imgp) { const char *image_header = imgp->image_header; const char *fname = NULL; int error = 0; #ifdef INVARIANTS int argv0_cnt = 0; #endif size_t namelen, offset; imgact_binmisc_entry_t *ibe; struct sbuf *sname; char *s, *d; sname = NULL; namelen = 0; /* Do we have an interpreter for the given image header? */ INTERP_LIST_RLOCK(); if ((ibe = imgact_binmisc_find_interpreter(image_header)) == NULL) { error = -1; goto done; } /* No interpreter nesting allowed. */ if (imgp->interpreted & IMGACT_BINMISC) { error = ENOEXEC; goto done; } imgp->interpreted |= IMGACT_BINMISC; /* * Don't bother with the overhead of putting fname together if we're not * using #a. */ if (ibe->ibe_argv0_cnt != 0) { if (imgp->args->fname != NULL) { fname = imgp->args->fname; } else { /* Use the fdescfs(5) path for fexecve(2). */ sname = sbuf_new_auto(); sbuf_printf(sname, "/dev/fd/%d", imgp->args->fd); sbuf_finish(sname); fname = sbuf_data(sname); } namelen = strlen(fname); } /* * We need to "push" the interpreter in the arg[] list. To do this, * we first shift all the other values in the `begin_argv' area to * provide the exact amount of room for the values added. Set up * `offset' as the number of bytes to be added to the `begin_argv' * area. ibe_interp_offset is the fixed offset from macros present in * the interpreter string. */ offset = ibe->ibe_interp_length + ibe->ibe_interp_offset; /* Variable offset to be added from macros to the interpreter string. */ MPASS(ibe->ibe_argv0_cnt == 0 || namelen > 0); offset += ibe->ibe_argv0_cnt * (namelen - 2); /* Make room for the interpreter */ error = exec_args_adjust_args(imgp->args, 0, offset); if (error != 0) { goto done; } /* Add the new argument(s) in the count. */ imgp->args->argc += ibe->ibe_interp_argcnt; /* * The original arg[] list has been shifted appropriately. Copy in * the interpreter path. */ s = ibe->ibe_interpreter; d = imgp->args->begin_argv; while(*s != '\0') { switch (*s) { case '#': /* Handle "#" in interpreter string. */ s++; switch(*s) { case ISM_POUND: /* "##": Replace with a single '#' */ *d++ = '#'; break; case ISM_OLD_ARGV0: /* "#a": Replace with old arg0 (fname). */ MPASS(ibe->ibe_argv0_cnt >= ++argv0_cnt); memcpy(d, fname, namelen); d += namelen; break; default: __assert_unreachable(); } break; case ' ': /* Replace space with NUL to separate arguments. */ *d++ = '\0'; break; default: *d++ = *s; break; } s++; } *d = '\0'; /* Catch ibe->ibe_argv0_cnt counting more #a than we did. */ MPASS(ibe->ibe_argv0_cnt == argv0_cnt); imgp->interpreter_name = imgp->args->begin_argv; done: INTERP_LIST_RUNLOCK(); if (sname) sbuf_delete(sname); return (error); } static void imgact_binmisc_init(void *arg) { INTERP_LIST_LOCK_INIT(); } static void imgact_binmisc_fini(void *arg) { imgact_binmisc_entry_t *ibe, *ibe_tmp; /* Free all the interpreters. */ INTERP_LIST_WLOCK(); SLIST_FOREACH_SAFE(ibe, &interpreter_list, link, ibe_tmp) { SLIST_REMOVE(&interpreter_list, ibe, imgact_binmisc_entry, link); imgact_binmisc_destroy_entry(ibe); } INTERP_LIST_WUNLOCK(); INTERP_LIST_LOCK_DESTROY(); } SYSINIT(imgact_binmisc, SI_SUB_EXEC, SI_ORDER_MIDDLE, imgact_binmisc_init, NULL); SYSUNINIT(imgact_binmisc, SI_SUB_EXEC, SI_ORDER_MIDDLE, imgact_binmisc_fini, NULL); /* * Tell kern_execve.c about it, with a little help from the linker. */ static struct execsw imgact_binmisc_execsw = { .ex_imgact = imgact_binmisc_exec, .ex_name = KMOD_NAME }; EXEC_SET(imgact_binmisc, imgact_binmisc_execsw);
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