126f9a767SRodney W. Grimes /* 226f9a767SRodney W. Grimes * Copyright (c) 1993, David Greenman 326f9a767SRodney W. Grimes * All rights reserved. 4df8bae1dSRodney W. Grimes * 5df8bae1dSRodney W. Grimes * Redistribution and use in source and binary forms, with or without 6df8bae1dSRodney W. Grimes * modification, are permitted provided that the following conditions 7df8bae1dSRodney W. Grimes * are met: 8df8bae1dSRodney W. Grimes * 1. Redistributions of source code must retain the above copyright 9df8bae1dSRodney W. Grimes * notice, this list of conditions and the following disclaimer. 10df8bae1dSRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright 11df8bae1dSRodney W. Grimes * notice, this list of conditions and the following disclaimer in the 12df8bae1dSRodney W. Grimes * documentation and/or other materials provided with the distribution. 13df8bae1dSRodney W. Grimes * 1426f9a767SRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15df8bae1dSRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16df8bae1dSRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1726f9a767SRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18df8bae1dSRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19df8bae1dSRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20df8bae1dSRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21df8bae1dSRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22df8bae1dSRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23df8bae1dSRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24df8bae1dSRodney W. Grimes * SUCH DAMAGE. 25df8bae1dSRodney W. Grimes */ 26df8bae1dSRodney W. Grimes 27677b542eSDavid E. O'Brien #include <sys/cdefs.h> 28677b542eSDavid E. O'Brien __FBSDID("$FreeBSD$"); 29677b542eSDavid E. O'Brien 301e9b3d91SPeter Wemm #include "opt_ktrace.h" 31339b79b9SRobert Watson #include "opt_mac.h" 321e9b3d91SPeter Wemm 33df8bae1dSRodney W. Grimes #include <sys/param.h> 3426f9a767SRodney W. Grimes #include <sys/systm.h> 3575b8b3b2SJohn Baldwin #include <sys/eventhandler.h> 36fb919e4dSMark Murray #include <sys/lock.h> 37fb919e4dSMark Murray #include <sys/mutex.h> 38d2d3e875SBruce Evans #include <sys/sysproto.h> 3926f9a767SRodney W. Grimes #include <sys/signalvar.h> 4026f9a767SRodney W. Grimes #include <sys/kernel.h> 41339b79b9SRobert Watson #include <sys/mac.h> 4226f9a767SRodney W. Grimes #include <sys/mount.h> 43797f2d22SPoul-Henning Kamp #include <sys/filedesc.h> 44079cc25bSDavid Greenman #include <sys/fcntl.h> 4526f9a767SRodney W. Grimes #include <sys/acct.h> 4626f9a767SRodney W. Grimes #include <sys/exec.h> 4726f9a767SRodney W. Grimes #include <sys/imgact.h> 48e1743d02SSøren Schmidt #include <sys/imgact_elf.h> 4926f9a767SRodney W. Grimes #include <sys/wait.h> 50333ea485SGuido van Rooij #include <sys/malloc.h> 51a794e791SBruce Evans #include <sys/proc.h> 522a024a2bSSean Eric Fagan #include <sys/pioctl.h> 53a794e791SBruce Evans #include <sys/namei.h> 541e1e0b44SSøren Schmidt #include <sys/sysent.h> 55797f2d22SPoul-Henning Kamp #include <sys/shm.h> 5699ac3bc8SPeter Wemm #include <sys/sysctl.h> 57333ea485SGuido van Rooij #include <sys/user.h> 58a794e791SBruce Evans #include <sys/vnode.h> 59c781aea8SPeter Wemm #ifdef KTRACE 60c781aea8SPeter Wemm #include <sys/ktrace.h> 61c781aea8SPeter Wemm #endif 6226f9a767SRodney W. Grimes 6326f9a767SRodney W. Grimes #include <vm/vm.h> 64efeaf95aSDavid Greenman #include <vm/vm_param.h> 65efeaf95aSDavid Greenman #include <vm/pmap.h> 661616db3cSJohn Dyson #include <vm/vm_page.h> 67efeaf95aSDavid Greenman #include <vm/vm_map.h> 6826f9a767SRodney W. Grimes #include <vm/vm_kern.h> 69efeaf95aSDavid Greenman #include <vm/vm_extern.h> 701ebd0c59SDavid Greenman #include <vm/vm_object.h> 711616db3cSJohn Dyson #include <vm/vm_pager.h> 7226f9a767SRodney W. Grimes 7326f9a767SRodney W. Grimes #include <machine/reg.h> 7426f9a767SRodney W. Grimes 75b9df5231SPoul-Henning Kamp MALLOC_DEFINE(M_PARGS, "proc-args", "Process arguments"); 76b9df5231SPoul-Henning Kamp 7705ba50f5SJake Burkholder static int sysctl_kern_ps_strings(SYSCTL_HANDLER_ARGS); 7805ba50f5SJake Burkholder static int sysctl_kern_usrstack(SYSCTL_HANDLER_ARGS); 795dadd17bSJake Burkholder static int sysctl_kern_stackprot(SYSCTL_HANDLER_ARGS); 80450ffb44SRobert Watson static int kern_execve(struct thread *td, char *fname, char **argv, 81670cb89bSRobert Watson char **envv, struct mac *mac_p); 8205ba50f5SJake Burkholder 839701cd40SJohn Baldwin /* XXX This should be vm_size_t. */ 8405ba50f5SJake Burkholder SYSCTL_PROC(_kern, KERN_PS_STRINGS, ps_strings, CTLTYPE_ULONG|CTLFLAG_RD, 8505ba50f5SJake Burkholder NULL, 0, sysctl_kern_ps_strings, "LU", ""); 86486bddb0SDoug Rabson 879701cd40SJohn Baldwin /* XXX This should be vm_size_t. */ 8805ba50f5SJake Burkholder SYSCTL_PROC(_kern, KERN_USRSTACK, usrstack, CTLTYPE_ULONG|CTLFLAG_RD, 8905ba50f5SJake Burkholder NULL, 0, sysctl_kern_usrstack, "LU", ""); 9099ac3bc8SPeter Wemm 915dadd17bSJake Burkholder SYSCTL_PROC(_kern, OID_AUTO, stackprot, CTLTYPE_INT|CTLFLAG_RD, 925dadd17bSJake Burkholder NULL, 0, sysctl_kern_stackprot, "I", ""); 935dadd17bSJake Burkholder 94b9df5231SPoul-Henning Kamp u_long ps_arg_cache_limit = PAGE_SIZE / 16; 95c3699b5fSPeter Wemm SYSCTL_ULONG(_kern, OID_AUTO, ps_arg_cache_limit, CTLFLAG_RW, 969701cd40SJohn Baldwin &ps_arg_cache_limit, 0, ""); 97b9df5231SPoul-Henning Kamp 98a8704f89SPoul-Henning Kamp int ps_argsopen = 1; 99a8704f89SPoul-Henning Kamp SYSCTL_INT(_kern, OID_AUTO, ps_argsopen, CTLFLAG_RW, &ps_argsopen, 0, ""); 100a8704f89SPoul-Henning Kamp 10105ba50f5SJake Burkholder static int 10205ba50f5SJake Burkholder sysctl_kern_ps_strings(SYSCTL_HANDLER_ARGS) 10305ba50f5SJake Burkholder { 10405ba50f5SJake Burkholder struct proc *p; 10505ba50f5SJake Burkholder 10605ba50f5SJake Burkholder p = curproc; 10705ba50f5SJake Burkholder return (SYSCTL_OUT(req, &p->p_sysent->sv_psstrings, 10805ba50f5SJake Burkholder sizeof(p->p_sysent->sv_psstrings))); 10905ba50f5SJake Burkholder } 11005ba50f5SJake Burkholder 11105ba50f5SJake Burkholder static int 11205ba50f5SJake Burkholder sysctl_kern_usrstack(SYSCTL_HANDLER_ARGS) 11305ba50f5SJake Burkholder { 11405ba50f5SJake Burkholder struct proc *p; 11505ba50f5SJake Burkholder 11605ba50f5SJake Burkholder p = curproc; 11705ba50f5SJake Burkholder return (SYSCTL_OUT(req, &p->p_sysent->sv_usrstack, 11805ba50f5SJake Burkholder sizeof(p->p_sysent->sv_usrstack))); 11905ba50f5SJake Burkholder } 12005ba50f5SJake Burkholder 1215dadd17bSJake Burkholder static int 1225dadd17bSJake Burkholder sysctl_kern_stackprot(SYSCTL_HANDLER_ARGS) 1235dadd17bSJake Burkholder { 1245dadd17bSJake Burkholder struct proc *p; 1255dadd17bSJake Burkholder 1265dadd17bSJake Burkholder p = curproc; 1275dadd17bSJake Burkholder return (SYSCTL_OUT(req, &p->p_sysent->sv_stackprot, 1285dadd17bSJake Burkholder sizeof(p->p_sysent->sv_stackprot))); 1295dadd17bSJake Burkholder } 1305dadd17bSJake Burkholder 13199ac3bc8SPeter Wemm /* 132aa855a59SPeter Wemm * Each of the items is a pointer to a `const struct execsw', hence the 133aa855a59SPeter Wemm * double pointer here. 134df8bae1dSRodney W. Grimes */ 135aa855a59SPeter Wemm static const struct execsw **execsw; 13626f9a767SRodney W. Grimes 137ca46e90eSBruce Evans #ifndef _SYS_SYSPROTO_H_ 138ca46e90eSBruce Evans struct execve_args { 139ca46e90eSBruce Evans char *fname; 140ca46e90eSBruce Evans char **argv; 141ca46e90eSBruce Evans char **envv; 142ca46e90eSBruce Evans }; 143ca46e90eSBruce Evans #endif 144ca46e90eSBruce Evans 145ca46e90eSBruce Evans /* 146ca46e90eSBruce Evans * MPSAFE 147ca46e90eSBruce Evans */ 148ca46e90eSBruce Evans int 149ca46e90eSBruce Evans execve(td, uap) 150ca46e90eSBruce Evans struct thread *td; 151ca46e90eSBruce Evans struct execve_args /* { 152ca46e90eSBruce Evans char *fname; 153ca46e90eSBruce Evans char **argv; 154ca46e90eSBruce Evans char **envv; 155ca46e90eSBruce Evans } */ *uap; 156ca46e90eSBruce Evans { 157ca46e90eSBruce Evans 158ca46e90eSBruce Evans return (kern_execve(td, uap->fname, uap->argv, uap->envv, NULL)); 159ca46e90eSBruce Evans } 160ca46e90eSBruce Evans 161ca46e90eSBruce Evans #ifndef _SYS_SYSPROTO_H_ 162ca46e90eSBruce Evans struct __mac_execve_args { 163ca46e90eSBruce Evans char *fname; 164ca46e90eSBruce Evans char **argv; 165ca46e90eSBruce Evans char **envv; 166ca46e90eSBruce Evans struct mac *mac_p; 167ca46e90eSBruce Evans }; 168ca46e90eSBruce Evans #endif 169ca46e90eSBruce Evans 170ca46e90eSBruce Evans /* 171ca46e90eSBruce Evans * MPSAFE 172ca46e90eSBruce Evans */ 173ca46e90eSBruce Evans int 174ca46e90eSBruce Evans __mac_execve(td, uap) 175ca46e90eSBruce Evans struct thread *td; 176ca46e90eSBruce Evans struct __mac_execve_args /* { 177ca46e90eSBruce Evans char *fname; 178ca46e90eSBruce Evans char **argv; 179ca46e90eSBruce Evans char **envv; 180ca46e90eSBruce Evans struct mac *mac_p; 181ca46e90eSBruce Evans } */ *uap; 182ca46e90eSBruce Evans { 183ca46e90eSBruce Evans 184ca46e90eSBruce Evans #ifdef MAC 185ca46e90eSBruce Evans return (kern_execve(td, uap->fname, uap->argv, uap->envv, 186ca46e90eSBruce Evans uap->mac_p)); 187ca46e90eSBruce Evans #else 188ca46e90eSBruce Evans return (ENOSYS); 189ca46e90eSBruce Evans #endif 190ca46e90eSBruce Evans } 191ca46e90eSBruce Evans 19226f9a767SRodney W. Grimes /* 193450ffb44SRobert Watson * In-kernel implementation of execve(). All arguments are assumed to be 194450ffb44SRobert Watson * userspace pointers from the passed thread. 195116734c4SMatthew Dillon * 196116734c4SMatthew Dillon * MPSAFE 19726f9a767SRodney W. Grimes */ 198450ffb44SRobert Watson static int 199670cb89bSRobert Watson kern_execve(td, fname, argv, envv, mac_p) 200b40ce416SJulian Elischer struct thread *td; 201450ffb44SRobert Watson char *fname; 202450ffb44SRobert Watson char **argv; 203450ffb44SRobert Watson char **envv; 204670cb89bSRobert Watson struct mac *mac_p; 205df8bae1dSRodney W. Grimes { 206b40ce416SJulian Elischer struct proc *p = td->td_proc; 20726f9a767SRodney W. Grimes struct nameidata nd, *ndp; 2089b3b1c5fSJohn Baldwin struct ucred *newcred = NULL, *oldcred; 2091419eacbSAlfred Perlstein struct uidinfo *euip; 210654f6be1SBruce Evans register_t *stack_base; 211bb56ec4aSPoul-Henning Kamp int error, len, i; 212c52007c2SDavid Greenman struct image_params image_params, *imgp; 21326f9a767SRodney W. Grimes struct vattr attr; 2144d77a549SAlfred Perlstein int (*img_first)(struct image_params *); 21569be5db9SAlfred Perlstein struct pargs *oldargs = NULL, *newargs = NULL; 21690af4afaSJohn Baldwin struct sigacts *oldsigacts, *newsigacts; 2176c84de02SJohn Baldwin #ifdef KTRACE 2186c84de02SJohn Baldwin struct vnode *tracevp = NULL; 219a5881ea5SJohn Baldwin struct ucred *tracecred = NULL; 2206c84de02SJohn Baldwin #endif 2216c84de02SJohn Baldwin struct vnode *textvp = NULL; 222d06c0d4dSRobert Watson int credential_changing; 223619eb6e5SJeff Roberson int textset; 224ccafe7ebSRobert Watson #ifdef MAC 225eca8a663SRobert Watson struct label *interplabel = NULL; 226eca8a663SRobert Watson int will_transition; 227ccafe7ebSRobert Watson #endif 22826f9a767SRodney W. Grimes 229c52007c2SDavid Greenman imgp = &image_params; 230df8bae1dSRodney W. Grimes 2319ca45e81SDag-Erling Smørgrav /* 2329ca45e81SDag-Erling Smørgrav * Lock the process and set the P_INEXEC flag to indicate that 2339ca45e81SDag-Erling Smørgrav * it should be left alone until we're done here. This is 2349ca45e81SDag-Erling Smørgrav * necessary to avoid race conditions - e.g. in ptrace() - 2359ca45e81SDag-Erling Smørgrav * that might allow a local user to illicitly obtain elevated 2369ca45e81SDag-Erling Smørgrav * privileges. 2379ca45e81SDag-Erling Smørgrav */ 2389ca45e81SDag-Erling Smørgrav PROC_LOCK(p); 2399ca45e81SDag-Erling Smørgrav KASSERT((p->p_flag & P_INEXEC) == 0, 24091f91617SDavid E. O'Brien ("%s(): process already has P_INEXEC flag", __func__)); 2410e2a4d3aSDavid Xu if (p->p_flag & P_SA || p->p_numthreads > 1) { 2421279572aSDavid Xu if (thread_single(SINGLE_EXIT)) { 243e602ba25SJulian Elischer PROC_UNLOCK(p); 244e602ba25SJulian Elischer return (ERESTART); /* Try again later. */ 245e602ba25SJulian Elischer } 24649539972SJulian Elischer /* 24749539972SJulian Elischer * If we get here all other threads are dead, 24849539972SJulian Elischer * so unset the associated flags and lose KSE mode. 24949539972SJulian Elischer */ 2500e2a4d3aSDavid Xu p->p_flag &= ~P_SA; 25145f603e2SDavid Xu td->td_mailbox = NULL; 25249539972SJulian Elischer thread_single_end(); 25349539972SJulian Elischer } 2549ca45e81SDag-Erling Smørgrav p->p_flag |= P_INEXEC; 2559ca45e81SDag-Erling Smørgrav PROC_UNLOCK(p); 2569ca45e81SDag-Erling Smørgrav 257df8bae1dSRodney W. Grimes /* 258c52007c2SDavid Greenman * Initialize part of the common data 259df8bae1dSRodney W. Grimes */ 260c52007c2SDavid Greenman imgp->proc = p; 261450ffb44SRobert Watson imgp->userspace_argv = argv; 262450ffb44SRobert Watson imgp->userspace_envv = envv; 263670cb89bSRobert Watson imgp->execlabel = NULL; 264c52007c2SDavid Greenman imgp->attr = &attr; 265c52007c2SDavid Greenman imgp->argc = imgp->envc = 0; 2665cf3d12cSAndrey A. Chernov imgp->argv0 = NULL; 267c52007c2SDavid Greenman imgp->entry_addr = 0; 268c52007c2SDavid Greenman imgp->vmspace_destroyed = 0; 269c52007c2SDavid Greenman imgp->interpreted = 0; 270c52007c2SDavid Greenman imgp->interpreter_name[0] = '\0'; 271e1743d02SSøren Schmidt imgp->auxargs = NULL; 2721616db3cSJohn Dyson imgp->vp = NULL; 2730b2ed1aeSJeff Roberson imgp->object = NULL; 2741616db3cSJohn Dyson imgp->firstpage = NULL; 2754fe88fe6SJohn Polstra imgp->ps_strings = 0; 276b9a22da4STakanori Watanabe imgp->auxarg_size = 0; 27726f9a767SRodney W. Grimes 278670cb89bSRobert Watson #ifdef MAC 279eca8a663SRobert Watson error = mac_execve_enter(imgp, mac_p); 280670cb89bSRobert Watson if (error) { 281670cb89bSRobert Watson mtx_lock(&Giant); 282670cb89bSRobert Watson goto exec_fail; 283670cb89bSRobert Watson } 284670cb89bSRobert Watson #endif 285670cb89bSRobert Watson 28626f9a767SRodney W. Grimes /* 28726f9a767SRodney W. Grimes * Allocate temporary demand zeroed space for argument and 28826f9a767SRodney W. Grimes * environment strings 28926f9a767SRodney W. Grimes */ 290ca0387efSJake Burkholder imgp->stringbase = (char *)kmem_alloc_wait(exec_map, ARG_MAX + 291ca0387efSJake Burkholder PAGE_SIZE); 292c2f9f36bSDavid Greenman if (imgp->stringbase == NULL) { 29326f9a767SRodney W. Grimes error = ENOMEM; 294b3afd20dSAlan Cox mtx_lock(&Giant); 29526f9a767SRodney W. Grimes goto exec_fail; 29626f9a767SRodney W. Grimes } 297c52007c2SDavid Greenman imgp->stringp = imgp->stringbase; 298c52007c2SDavid Greenman imgp->stringspace = ARG_MAX; 2991616db3cSJohn Dyson imgp->image_header = imgp->stringbase + ARG_MAX; 30026f9a767SRodney W. Grimes 30126f9a767SRodney W. Grimes /* 30226f9a767SRodney W. Grimes * Translate the file name. namei() returns a vnode pointer 30326f9a767SRodney W. Grimes * in ni_vp amoung other things. 30426f9a767SRodney W. Grimes */ 30526f9a767SRodney W. Grimes ndp = &nd; 306b35ba931SDavid Greenman NDINIT(ndp, LOOKUP, LOCKLEAF | FOLLOW | SAVENAME, 307450ffb44SRobert Watson UIO_USERSPACE, fname, td); 30826f9a767SRodney W. Grimes 309b3afd20dSAlan Cox mtx_lock(&Giant); 31026f9a767SRodney W. Grimes interpret: 31126f9a767SRodney W. Grimes 31226f9a767SRodney W. Grimes error = namei(ndp); 31326f9a767SRodney W. Grimes if (error) { 3141616db3cSJohn Dyson kmem_free_wakeup(exec_map, (vm_offset_t)imgp->stringbase, 3151616db3cSJohn Dyson ARG_MAX + PAGE_SIZE); 31626f9a767SRodney W. Grimes goto exec_fail; 31726f9a767SRodney W. Grimes } 31826f9a767SRodney W. Grimes 319c52007c2SDavid Greenman imgp->vp = ndp->ni_vp; 320450ffb44SRobert Watson imgp->fname = fname; 32126f9a767SRodney W. Grimes 32226f9a767SRodney W. Grimes /* 3239022e4adSDavid Greenman * Check file permissions (also 'opens' file) 3249022e4adSDavid Greenman */ 325c52007c2SDavid Greenman error = exec_check_permissions(imgp); 326619eb6e5SJeff Roberson if (error) 32726f9a767SRodney W. Grimes goto exec_fail_dealloc; 328619eb6e5SJeff Roberson 329619eb6e5SJeff Roberson if (VOP_GETVOBJECT(imgp->vp, &imgp->object) == 0) 3300b2ed1aeSJeff Roberson vm_object_reference(imgp->object); 33126f9a767SRodney W. Grimes 332619eb6e5SJeff Roberson /* 333619eb6e5SJeff Roberson * Set VV_TEXT now so no one can write to the executable while we're 334619eb6e5SJeff Roberson * activating it. 335619eb6e5SJeff Roberson * 336619eb6e5SJeff Roberson * Remember if this was set before and unset it in case this is not 337619eb6e5SJeff Roberson * actually an executable image. 338619eb6e5SJeff Roberson */ 339619eb6e5SJeff Roberson textset = imgp->vp->v_vflag & VV_TEXT; 340619eb6e5SJeff Roberson imgp->vp->v_vflag |= VV_TEXT; 341619eb6e5SJeff Roberson 3421616db3cSJohn Dyson error = exec_map_first_page(imgp); 3436d5a0a8cSDavid Greenman if (error) 34426f9a767SRodney W. Grimes goto exec_fail_dealloc; 34526f9a767SRodney W. Grimes 34626f9a767SRodney W. Grimes /* 347d323ddf3SMatthew Dillon * If the current process has a special image activator it 348d323ddf3SMatthew Dillon * wants to try first, call it. For example, emulating shell 349d323ddf3SMatthew Dillon * scripts differently. 35026f9a767SRodney W. Grimes */ 351d323ddf3SMatthew Dillon error = -1; 352d323ddf3SMatthew Dillon if ((img_first = imgp->proc->p_sysent->sv_imgact_try) != NULL) 353d323ddf3SMatthew Dillon error = img_first(imgp); 354d323ddf3SMatthew Dillon 355d323ddf3SMatthew Dillon /* 356d323ddf3SMatthew Dillon * Loop through the list of image activators, calling each one. 357d323ddf3SMatthew Dillon * An activator returns -1 if there is no match, 0 on success, 358d323ddf3SMatthew Dillon * and an error otherwise. 359d323ddf3SMatthew Dillon */ 360d323ddf3SMatthew Dillon for (i = 0; error == -1 && execsw[i]; ++i) { 361d323ddf3SMatthew Dillon if (execsw[i]->ex_imgact == NULL || 362d323ddf3SMatthew Dillon execsw[i]->ex_imgact == img_first) { 363d323ddf3SMatthew Dillon continue; 364d323ddf3SMatthew Dillon } 365c52007c2SDavid Greenman error = (*execsw[i]->ex_imgact)(imgp); 366d323ddf3SMatthew Dillon } 367d323ddf3SMatthew Dillon 368d323ddf3SMatthew Dillon if (error) { 369619eb6e5SJeff Roberson if (error == -1) { 370619eb6e5SJeff Roberson if (textset == 0) 371619eb6e5SJeff Roberson imgp->vp->v_vflag &= ~VV_TEXT; 372d323ddf3SMatthew Dillon error = ENOEXEC; 373619eb6e5SJeff Roberson } 37426f9a767SRodney W. Grimes goto exec_fail_dealloc; 375d323ddf3SMatthew Dillon } 376d323ddf3SMatthew Dillon 377d323ddf3SMatthew Dillon /* 378d323ddf3SMatthew Dillon * Special interpreter operation, cleanup and loop up to try to 379d323ddf3SMatthew Dillon * activate the interpreter. 380d323ddf3SMatthew Dillon */ 381c52007c2SDavid Greenman if (imgp->interpreted) { 3821616db3cSJohn Dyson exec_unmap_first_page(imgp); 383619eb6e5SJeff Roberson /* 384619eb6e5SJeff Roberson * VV_TEXT needs to be unset for scripts. There is a short 385619eb6e5SJeff Roberson * period before we determine that something is a script where 386619eb6e5SJeff Roberson * VV_TEXT will be set. The vnode lock is held over this 387619eb6e5SJeff Roberson * entire period so nothing should illegitimately be blocked. 388619eb6e5SJeff Roberson */ 389619eb6e5SJeff Roberson imgp->vp->v_vflag &= ~VV_TEXT; 390762e6b85SEivind Eklund /* free name buffer and old vnode */ 391762e6b85SEivind Eklund NDFREE(ndp, NDF_ONLY_PNBUF); 392670cb89bSRobert Watson #ifdef MAC 393eca8a663SRobert Watson interplabel = mac_vnode_label_alloc(); 394eca8a663SRobert Watson mac_copy_vnode_label(ndp->ni_vp->v_label, interplabel); 395670cb89bSRobert Watson #endif 396619eb6e5SJeff Roberson vput(ndp->ni_vp); 3970b2ed1aeSJeff Roberson vm_object_deallocate(imgp->object); 3980b2ed1aeSJeff Roberson imgp->object = NULL; 39926f9a767SRodney W. Grimes /* set new name to that of the interpreter */ 400b35ba931SDavid Greenman NDINIT(ndp, LOOKUP, LOCKLEAF | FOLLOW | SAVENAME, 401b40ce416SJulian Elischer UIO_SYSSPACE, imgp->interpreter_name, td); 40226f9a767SRodney W. Grimes goto interpret; 40326f9a767SRodney W. Grimes } 40426f9a767SRodney W. Grimes 40526f9a767SRodney W. Grimes /* 40626f9a767SRodney W. Grimes * Copy out strings (args and env) and initialize stack base 40726f9a767SRodney W. Grimes */ 4083ebc1248SPeter Wemm if (p->p_sysent->sv_copyout_strings) 4093ebc1248SPeter Wemm stack_base = (*p->p_sysent->sv_copyout_strings)(imgp); 4103ebc1248SPeter Wemm else 411c52007c2SDavid Greenman stack_base = exec_copyout_strings(imgp); 41226f9a767SRodney W. Grimes 41326f9a767SRodney W. Grimes /* 4141e1e0b44SSøren Schmidt * If custom stack fixup routine present for this process 4151e1e0b44SSøren Schmidt * let it do the stack setup. 4161e1e0b44SSøren Schmidt * Else stuff argument count as first item on stack 41726f9a767SRodney W. Grimes */ 4181e1e0b44SSøren Schmidt if (p->p_sysent->sv_fixup) 419c52007c2SDavid Greenman (*p->p_sysent->sv_fixup)(&stack_base, imgp); 4201e1e0b44SSøren Schmidt else 421c52007c2SDavid Greenman suword(--stack_base, imgp->argc); 42226f9a767SRodney W. Grimes 423a78e8d2aSDavid Greenman /* 424a78e8d2aSDavid Greenman * For security and other reasons, the file descriptor table cannot 425a78e8d2aSDavid Greenman * be shared after an exec. 426a78e8d2aSDavid Greenman */ 427426da3bcSAlfred Perlstein FILEDESC_LOCK(p->p_fd); 428a78e8d2aSDavid Greenman if (p->p_fd->fd_refcnt > 1) { 429a78e8d2aSDavid Greenman struct filedesc *tmp; 430a78e8d2aSDavid Greenman 431c522c1bfSAlfred Perlstein tmp = fdcopy(td->td_proc->p_fd); 432426da3bcSAlfred Perlstein FILEDESC_UNLOCK(p->p_fd); 433b40ce416SJulian Elischer fdfree(td); 434a78e8d2aSDavid Greenman p->p_fd = tmp; 435426da3bcSAlfred Perlstein } else 436426da3bcSAlfred Perlstein FILEDESC_UNLOCK(p->p_fd); 437a78e8d2aSDavid Greenman 438333ea485SGuido van Rooij /* 4399b3b1c5fSJohn Baldwin * Malloc things before we need locks. 4409b3b1c5fSJohn Baldwin */ 4419b3b1c5fSJohn Baldwin newcred = crget(); 4421419eacbSAlfred Perlstein euip = uifind(attr.va_uid); 4439b3b1c5fSJohn Baldwin i = imgp->endargs - imgp->stringbase; 4449b3b1c5fSJohn Baldwin if (ps_arg_cache_limit >= i + sizeof(struct pargs)) 4459b3b1c5fSJohn Baldwin newargs = pargs_alloc(i); 4469b3b1c5fSJohn Baldwin 4479b3b1c5fSJohn Baldwin /* close files on exec */ 4489b3b1c5fSJohn Baldwin fdcloseexec(td); 4499b3b1c5fSJohn Baldwin 450619eb6e5SJeff Roberson /* Get a reference to the vnode prior to locking the proc */ 451619eb6e5SJeff Roberson VREF(ndp->ni_vp); 452619eb6e5SJeff Roberson 4539b3b1c5fSJohn Baldwin /* 454333ea485SGuido van Rooij * For security and other reasons, signal handlers cannot 4558688bb93SJohn Baldwin * be shared after an exec. The new process gets a copy of the old 456b2c3fa70SDima Dorfman * handlers. In execsigs(), the new process will have its signals 457333ea485SGuido van Rooij * reset. 458333ea485SGuido van Rooij */ 4599b3b1c5fSJohn Baldwin PROC_LOCK(p); 46090af4afaSJohn Baldwin if (sigacts_shared(p->p_sigacts)) { 46190af4afaSJohn Baldwin oldsigacts = p->p_sigacts; 4629b3b1c5fSJohn Baldwin PROC_UNLOCK(p); 46390af4afaSJohn Baldwin newsigacts = sigacts_alloc(); 46490af4afaSJohn Baldwin sigacts_copy(newsigacts, oldsigacts); 4659b3b1c5fSJohn Baldwin PROC_LOCK(p); 46690af4afaSJohn Baldwin p->p_sigacts = newsigacts; 46790af4afaSJohn Baldwin } else 46890af4afaSJohn Baldwin oldsigacts = NULL; 469333ea485SGuido van Rooij 470fdf4e8b3SWarner Losh /* Stop profiling */ 471fdf4e8b3SWarner Losh stopprofclock(p); 472fdf4e8b3SWarner Losh 47326f9a767SRodney W. Grimes /* reset caught signals */ 47426f9a767SRodney W. Grimes execsigs(p); 47526f9a767SRodney W. Grimes 47626f9a767SRodney W. Grimes /* name this process - nameiexec(p, ndp) */ 47726f9a767SRodney W. Grimes len = min(ndp->ni_cnd.cn_namelen,MAXCOMLEN); 47826f9a767SRodney W. Grimes bcopy(ndp->ni_cnd.cn_nameptr, p->p_comm, len); 47926f9a767SRodney W. Grimes p->p_comm[len] = 0; 48026f9a767SRodney W. Grimes 48126f9a767SRodney W. Grimes /* 48224b34f09SSujal Patel * mark as execed, wakeup the process that vforked (if any) and tell 483dc733423SDag-Erling Smørgrav * it that it now has its own resources back 48426f9a767SRodney W. Grimes */ 48526f9a767SRodney W. Grimes p->p_flag |= P_EXEC; 48626f9a767SRodney W. Grimes if (p->p_pptr && (p->p_flag & P_PPWAIT)) { 48726f9a767SRodney W. Grimes p->p_flag &= ~P_PPWAIT; 4887f05b035SAlfred Perlstein wakeup(p->p_pptr); 48926f9a767SRodney W. Grimes } 49026f9a767SRodney W. Grimes 49126f9a767SRodney W. Grimes /* 492a78e8d2aSDavid Greenman * Implement image setuid/setgid. 493a78e8d2aSDavid Greenman * 494a78e8d2aSDavid Greenman * Don't honor setuid/setgid if the filesystem prohibits it or if 495a78e8d2aSDavid Greenman * the process is being traced. 496670cb89bSRobert Watson * 497670cb89bSRobert Watson * XXXMAC: For the time being, use NOSUID to also prohibit 498670cb89bSRobert Watson * transitions on the file system. 499c52007c2SDavid Greenman */ 500b1fc0ec1SRobert Watson oldcred = p->p_ucred; 501d06c0d4dSRobert Watson credential_changing = 0; 502d06c0d4dSRobert Watson credential_changing |= (attr.va_mode & VSUID) && oldcred->cr_uid != 503d06c0d4dSRobert Watson attr.va_uid; 504d06c0d4dSRobert Watson credential_changing |= (attr.va_mode & VSGID) && oldcred->cr_gid != 505d06c0d4dSRobert Watson attr.va_gid; 506ccafe7ebSRobert Watson #ifdef MAC 507670cb89bSRobert Watson will_transition = mac_execve_will_transition(oldcred, imgp->vp, 508eca8a663SRobert Watson interplabel, imgp); 509ccafe7ebSRobert Watson credential_changing |= will_transition; 510ccafe7ebSRobert Watson #endif 511d06c0d4dSRobert Watson 512d06c0d4dSRobert Watson if (credential_changing && 513a78e8d2aSDavid Greenman (imgp->vp->v_mount->mnt_flag & MNT_NOSUID) == 0 && 514c52007c2SDavid Greenman (p->p_flag & P_TRACED) == 0) { 515c52007c2SDavid Greenman /* 516c52007c2SDavid Greenman * Turn off syscall tracing for set-id programs, except for 517b85db196SPeter Wemm * root. Record any set-id flags first to make sure that 518b85db196SPeter Wemm * we do not regain any tracing during a possible block. 51926f9a767SRodney W. Grimes */ 520b85db196SPeter Wemm setsugid(p); 5216c84de02SJohn Baldwin #ifdef KTRACE 522a5881ea5SJohn Baldwin if (p->p_tracevp != NULL && suser_cred(oldcred, PRISON_ROOT)) { 5236c84de02SJohn Baldwin mtx_lock(&ktrace_mtx); 52479deba82SMatthew Dillon p->p_traceflag = 0; 525a5881ea5SJohn Baldwin tracevp = p->p_tracevp; 526a5881ea5SJohn Baldwin p->p_tracevp = NULL; 527a5881ea5SJohn Baldwin tracecred = p->p_tracecred; 528a5881ea5SJohn Baldwin p->p_tracecred = NULL; 5296c84de02SJohn Baldwin mtx_unlock(&ktrace_mtx); 53026f9a767SRodney W. Grimes } 5316c84de02SJohn Baldwin #endif 53228b325aaSDon Lewis /* 533c1e2d386SNate Lawson * Close any file descriptors 0..2 that reference procfs, 534c1e2d386SNate Lawson * then make sure file descriptors 0..2 are in use. 53528b325aaSDon Lewis * 536c1e2d386SNate Lawson * setugidsafety() may call closef() and then pfind() 537c1e2d386SNate Lawson * which may grab the process lock. 53828b325aaSDon Lewis * fdcheckstd() may call falloc() which may block to 53928b325aaSDon Lewis * allocate memory, so temporarily drop the process lock. 54028b325aaSDon Lewis */ 54128b325aaSDon Lewis PROC_UNLOCK(p); 542c1e2d386SNate Lawson setugidsafety(td); 543e983a376SJacques Vidrine error = fdcheckstd(td); 54463c9e754SJohn Baldwin if (error != 0) 54569be5db9SAlfred Perlstein goto done1; 546e1b1aa3bSJohn Baldwin PROC_LOCK(p); 547c52007c2SDavid Greenman /* 548c52007c2SDavid Greenman * Set the new credentials. 549c52007c2SDavid Greenman */ 5509b3b1c5fSJohn Baldwin crcopy(newcred, oldcred); 551c52007c2SDavid Greenman if (attr.va_mode & VSUID) 5521419eacbSAlfred Perlstein change_euid(newcred, euip); 553c52007c2SDavid Greenman if (attr.va_mode & VSGID) 554b1fc0ec1SRobert Watson change_egid(newcred, attr.va_gid); 555ccafe7ebSRobert Watson #ifdef MAC 556670cb89bSRobert Watson if (will_transition) { 557670cb89bSRobert Watson mac_execve_transition(oldcred, newcred, imgp->vp, 558eca8a663SRobert Watson interplabel, imgp); 559670cb89bSRobert Watson } 560ccafe7ebSRobert Watson #endif 5619b3b1c5fSJohn Baldwin /* 5629b3b1c5fSJohn Baldwin * Implement correct POSIX saved-id behavior. 563ccafe7ebSRobert Watson * 564ccafe7ebSRobert Watson * XXXMAC: Note that the current logic will save the 565ccafe7ebSRobert Watson * uid and gid if a MAC domain transition occurs, even 566ccafe7ebSRobert Watson * though maybe it shouldn't. 5679b3b1c5fSJohn Baldwin */ 5689b3b1c5fSJohn Baldwin change_svuid(newcred, newcred->cr_uid); 5699b3b1c5fSJohn Baldwin change_svgid(newcred, newcred->cr_gid); 5709b3b1c5fSJohn Baldwin p->p_ucred = newcred; 5719b3b1c5fSJohn Baldwin newcred = NULL; 572c52007c2SDavid Greenman } else { 573b1fc0ec1SRobert Watson if (oldcred->cr_uid == oldcred->cr_ruid && 574b1fc0ec1SRobert Watson oldcred->cr_gid == oldcred->cr_rgid) 575c52007c2SDavid Greenman p->p_flag &= ~P_SUGID; 57626f9a767SRodney W. Grimes /* 577c52007c2SDavid Greenman * Implement correct POSIX saved-id behavior. 578b1fc0ec1SRobert Watson * 579b1fc0ec1SRobert Watson * XXX: It's not clear that the existing behavior is 5809b3b1c5fSJohn Baldwin * POSIX-compliant. A number of sources indicate that the 5819b3b1c5fSJohn Baldwin * saved uid/gid should only be updated if the new ruid is 5829b3b1c5fSJohn Baldwin * not equal to the old ruid, or the new euid is not equal 5839b3b1c5fSJohn Baldwin * to the old euid and the new euid is not equal to the old 5849b3b1c5fSJohn Baldwin * ruid. The FreeBSD code always updates the saved uid/gid. 5859b3b1c5fSJohn Baldwin * Also, this code uses the new (replaced) euid and egid as 5869b3b1c5fSJohn Baldwin * the source, which may or may not be the right ones to use. 58726f9a767SRodney W. Grimes */ 588b1fc0ec1SRobert Watson if (oldcred->cr_svuid != oldcred->cr_uid || 589b1fc0ec1SRobert Watson oldcred->cr_svgid != oldcred->cr_gid) { 5909b3b1c5fSJohn Baldwin crcopy(newcred, oldcred); 591b1fc0ec1SRobert Watson change_svuid(newcred, newcred->cr_uid); 592b1fc0ec1SRobert Watson change_svgid(newcred, newcred->cr_gid); 593b1fc0ec1SRobert Watson p->p_ucred = newcred; 5949b3b1c5fSJohn Baldwin newcred = NULL; 5959b3b1c5fSJohn Baldwin } 596b1fc0ec1SRobert Watson } 59726f9a767SRodney W. Grimes 59826f9a767SRodney W. Grimes /* 599619eb6e5SJeff Roberson * Store the vp for use in procfs. This vnode was referenced prior 600619eb6e5SJeff Roberson * to locking the proc lock. 6012a531c80SDavid Greenman */ 6029b3b1c5fSJohn Baldwin textvp = p->p_textvp; 6032a531c80SDavid Greenman p->p_textvp = ndp->ni_vp; 6042a531c80SDavid Greenman 6052a531c80SDavid Greenman /* 6069ca45e81SDag-Erling Smørgrav * Notify others that we exec'd, and clear the P_INEXEC flag 6079ca45e81SDag-Erling Smørgrav * as we're now a bona fide freshly-execed process. 608cb679c38SJonathan Lemon */ 609cb679c38SJonathan Lemon KNOTE(&p->p_klist, NOTE_EXEC); 6109ca45e81SDag-Erling Smørgrav p->p_flag &= ~P_INEXEC; 611cb679c38SJonathan Lemon 612cb679c38SJonathan Lemon /* 61326f9a767SRodney W. Grimes * If tracing the process, trap to debugger so breakpoints 61426f9a767SRodney W. Grimes * can be set before the program executes. 61526f9a767SRodney W. Grimes */ 61626f9a767SRodney W. Grimes if (p->p_flag & P_TRACED) 61726f9a767SRodney W. Grimes psignal(p, SIGTRAP); 61826f9a767SRodney W. Grimes 61926f9a767SRodney W. Grimes /* clear "fork but no exec" flag, as we _are_ execing */ 62026f9a767SRodney W. Grimes p->p_acflag &= ~AFORK; 62126f9a767SRodney W. Grimes 622b9df5231SPoul-Henning Kamp /* Free any previous argument cache */ 6239b3b1c5fSJohn Baldwin oldargs = p->p_args; 624b9df5231SPoul-Henning Kamp p->p_args = NULL; 625b9df5231SPoul-Henning Kamp 626e1b1aa3bSJohn Baldwin /* Cache arguments if they fit inside our allowance */ 627e1b1aa3bSJohn Baldwin if (ps_arg_cache_limit >= i + sizeof(struct pargs)) { 628e1b1aa3bSJohn Baldwin bcopy(imgp->stringbase, newargs->ar_args, i); 629e1b1aa3bSJohn Baldwin p->p_args = newargs; 630e1b1aa3bSJohn Baldwin newargs = NULL; 631e1b1aa3bSJohn Baldwin } 632e1b1aa3bSJohn Baldwin PROC_UNLOCK(p); 633e1b1aa3bSJohn Baldwin 634e913ca22SDoug Rabson /* Set values passed into the program in registers. */ 6353ebc1248SPeter Wemm if (p->p_sysent->sv_setregs) 6363ebc1248SPeter Wemm (*p->p_sysent->sv_setregs)(td, imgp->entry_addr, 6373ebc1248SPeter Wemm (u_long)(uintptr_t)stack_base, imgp->ps_strings); 6383ebc1248SPeter Wemm else 639bafbd492SJake Burkholder exec_setregs(td, imgp->entry_addr, 640bafbd492SJake Burkholder (u_long)(uintptr_t)stack_base, imgp->ps_strings); 641e913ca22SDoug Rabson 64269be5db9SAlfred Perlstein done1: 6439b3b1c5fSJohn Baldwin /* 6449b3b1c5fSJohn Baldwin * Free any resources malloc'd earlier that we didn't use. 6459b3b1c5fSJohn Baldwin */ 6461419eacbSAlfred Perlstein uifree(euip); 6479b3b1c5fSJohn Baldwin if (newcred == NULL) 6489b3b1c5fSJohn Baldwin crfree(oldcred); 6499b3b1c5fSJohn Baldwin else 6509b3b1c5fSJohn Baldwin crfree(newcred); 6519b3b1c5fSJohn Baldwin /* 6529b3b1c5fSJohn Baldwin * Handle deferred decrement of ref counts. 6539b3b1c5fSJohn Baldwin */ 6549b3b1c5fSJohn Baldwin if (textvp != NULL) 6559b3b1c5fSJohn Baldwin vrele(textvp); 656619eb6e5SJeff Roberson if (ndp->ni_vp && error != 0) 657619eb6e5SJeff Roberson vrele(ndp->ni_vp); 6586c84de02SJohn Baldwin #ifdef KTRACE 6599b3b1c5fSJohn Baldwin if (tracevp != NULL) 6609b3b1c5fSJohn Baldwin vrele(tracevp); 661a5881ea5SJohn Baldwin if (tracecred != NULL) 662a5881ea5SJohn Baldwin crfree(tracecred); 6636c84de02SJohn Baldwin #endif 66469be5db9SAlfred Perlstein if (oldargs != NULL) 6659b3b1c5fSJohn Baldwin pargs_drop(oldargs); 66669be5db9SAlfred Perlstein if (newargs != NULL) 66769be5db9SAlfred Perlstein pargs_drop(newargs); 66890af4afaSJohn Baldwin if (oldsigacts != NULL) 66990af4afaSJohn Baldwin sigacts_free(oldsigacts); 670b9df5231SPoul-Henning Kamp 6711616db3cSJohn Dyson exec_fail_dealloc: 6721616db3cSJohn Dyson 67326f9a767SRodney W. Grimes /* 67426f9a767SRodney W. Grimes * free various allocated resources 67526f9a767SRodney W. Grimes */ 6761616db3cSJohn Dyson if (imgp->firstpage) 6771616db3cSJohn Dyson exec_unmap_first_page(imgp); 67826f9a767SRodney W. Grimes 6799c0fed3dSDoug Rabson if (imgp->vp) { 680762e6b85SEivind Eklund NDFREE(ndp, NDF_ONLY_PNBUF); 681619eb6e5SJeff Roberson vput(imgp->vp); 682a3cf6ebaSDavid Greenman } 68326f9a767SRodney W. Grimes 684a9a08882SJeff Roberson if (imgp->stringbase != NULL) 685a9a08882SJeff Roberson kmem_free_wakeup(exec_map, (vm_offset_t)imgp->stringbase, 686a9a08882SJeff Roberson ARG_MAX + PAGE_SIZE); 687a9a08882SJeff Roberson 6880b2ed1aeSJeff Roberson if (imgp->object) 6890b2ed1aeSJeff Roberson vm_object_deallocate(imgp->object); 6900b2ed1aeSJeff Roberson 691d1989db5SRobert Drehmel if (error == 0) { 692d1989db5SRobert Drehmel /* 693d1989db5SRobert Drehmel * Stop the process here if its stop event mask has 694d1989db5SRobert Drehmel * the S_EXEC bit set. 695d1989db5SRobert Drehmel */ 696d1989db5SRobert Drehmel STOPEVENT(p, S_EXEC, 0); 697116734c4SMatthew Dillon goto done2; 698d1989db5SRobert Drehmel } 6991616db3cSJohn Dyson 70026f9a767SRodney W. Grimes exec_fail: 7019ca45e81SDag-Erling Smørgrav /* we're done here, clear P_INEXEC */ 7029ca45e81SDag-Erling Smørgrav PROC_LOCK(p); 7039ca45e81SDag-Erling Smørgrav p->p_flag &= ~P_INEXEC; 7049ca45e81SDag-Erling Smørgrav PROC_UNLOCK(p); 7059ca45e81SDag-Erling Smørgrav 706c52007c2SDavid Greenman if (imgp->vmspace_destroyed) { 70726f9a767SRodney W. Grimes /* sorry, no more process anymore. exit gracefully */ 708670cb89bSRobert Watson #ifdef MAC 709670cb89bSRobert Watson mac_execve_exit(imgp); 710eca8a663SRobert Watson if (interplabel != NULL) 711eca8a663SRobert Watson mac_vnode_label_free(interplabel); 712670cb89bSRobert Watson #endif 713b40ce416SJulian Elischer exit1(td, W_EXITCODE(0, SIGABRT)); 71426f9a767SRodney W. Grimes /* NOT REACHED */ 715116734c4SMatthew Dillon error = 0; 71626f9a767SRodney W. Grimes } 717116734c4SMatthew Dillon done2: 718670cb89bSRobert Watson #ifdef MAC 719670cb89bSRobert Watson mac_execve_exit(imgp); 720eca8a663SRobert Watson if (interplabel != NULL) 721eca8a663SRobert Watson mac_vnode_label_free(interplabel); 722670cb89bSRobert Watson #endif 723116734c4SMatthew Dillon mtx_unlock(&Giant); 724116734c4SMatthew Dillon return (error); 72526f9a767SRodney W. Grimes } 72626f9a767SRodney W. Grimes 7271616db3cSJohn Dyson int 7281616db3cSJohn Dyson exec_map_first_page(imgp) 7291616db3cSJohn Dyson struct image_params *imgp; 7301616db3cSJohn Dyson { 731d8aad40cSJohn Baldwin int rv, i; 73295461b45SJohn Dyson int initial_pagein; 73395461b45SJohn Dyson vm_page_t ma[VM_INITIAL_PAGEIN]; 7341616db3cSJohn Dyson vm_object_t object; 7351616db3cSJohn Dyson 7360cddd8f0SMatthew Dillon GIANT_REQUIRED; 7371616db3cSJohn Dyson 7381616db3cSJohn Dyson if (imgp->firstpage) { 7391616db3cSJohn Dyson exec_unmap_first_page(imgp); 7401616db3cSJohn Dyson } 7411616db3cSJohn Dyson 7429ff5ce6bSBoris Popov VOP_GETVOBJECT(imgp->vp, &object); 743fd0cc9a8SAlan Cox VM_OBJECT_LOCK(object); 74495461b45SJohn Dyson ma[0] = vm_page_grab(object, 0, VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 74595461b45SJohn Dyson if ((ma[0]->valid & VM_PAGE_BITS_ALL) != VM_PAGE_BITS_ALL) { 74695461b45SJohn Dyson initial_pagein = VM_INITIAL_PAGEIN; 74795461b45SJohn Dyson if (initial_pagein > object->size) 74895461b45SJohn Dyson initial_pagein = object->size; 74995461b45SJohn Dyson for (i = 1; i < initial_pagein; i++) { 750d254af07SMatthew Dillon if ((ma[i] = vm_page_lookup(object, i)) != NULL) { 7516ec2fca5SAlan Cox if (ma[i]->valid) 7526ec2fca5SAlan Cox break; 753ee113343SAlan Cox vm_page_lock_queues(); 75406fa71cdSAlan Cox if ((ma[i]->flags & PG_BUSY) || ma[i]->busy) { 75506fa71cdSAlan Cox vm_page_unlock_queues(); 75606fa71cdSAlan Cox break; 75706fa71cdSAlan Cox } 758e69763a3SDoug Rabson vm_page_busy(ma[i]); 759ee113343SAlan Cox vm_page_unlock_queues(); 76095461b45SJohn Dyson } else { 761ca0387efSJake Burkholder ma[i] = vm_page_alloc(object, i, 762ca0387efSJake Burkholder VM_ALLOC_NORMAL); 76395461b45SJohn Dyson if (ma[i] == NULL) 76495461b45SJohn Dyson break; 76595461b45SJohn Dyson } 76695461b45SJohn Dyson } 76795461b45SJohn Dyson initial_pagein = i; 76895461b45SJohn Dyson rv = vm_pager_get_pages(object, ma, initial_pagein, 0); 76995461b45SJohn Dyson ma[0] = vm_page_lookup(object, 0); 770ca0387efSJake Burkholder if ((rv != VM_PAGER_OK) || (ma[0] == NULL) || 771ca0387efSJake Burkholder (ma[0]->valid == 0)) { 772ecbb00a2SDoug Rabson if (ma[0]) { 7736ec2fca5SAlan Cox vm_page_lock_queues(); 7744fec79beSAlan Cox pmap_remove_all(ma[0]); 7758f9110f6SJohn Dyson vm_page_free(ma[0]); 77606fa71cdSAlan Cox vm_page_unlock_queues(); 7776ec2fca5SAlan Cox } 77806fa71cdSAlan Cox VM_OBJECT_UNLOCK(object); 779a7cddfedSJake Burkholder return (EIO); 7801616db3cSJohn Dyson } 7811616db3cSJohn Dyson } 7826ec2fca5SAlan Cox vm_page_lock_queues(); 78395461b45SJohn Dyson vm_page_wire(ma[0]); 784e69763a3SDoug Rabson vm_page_wakeup(ma[0]); 78597646f56SAlan Cox vm_page_unlock_queues(); 7866ec2fca5SAlan Cox VM_OBJECT_UNLOCK(object); 7871616db3cSJohn Dyson 788ac59490bSJake Burkholder pmap_qenter((vm_offset_t)imgp->image_header, ma, 1); 78995461b45SJohn Dyson imgp->firstpage = ma[0]; 7901616db3cSJohn Dyson 791a7cddfedSJake Burkholder return (0); 7921616db3cSJohn Dyson } 7931616db3cSJohn Dyson 7941616db3cSJohn Dyson void 7951616db3cSJohn Dyson exec_unmap_first_page(imgp) 7961616db3cSJohn Dyson struct image_params *imgp; 7971616db3cSJohn Dyson { 79823955314SAlfred Perlstein 7991616db3cSJohn Dyson if (imgp->firstpage) { 800ac59490bSJake Burkholder pmap_qremove((vm_offset_t)imgp->image_header, 1); 80197646f56SAlan Cox vm_page_lock_queues(); 80273007561SDavid Greenman vm_page_unwire(imgp->firstpage, 1); 80397646f56SAlan Cox vm_page_unlock_queues(); 8041616db3cSJohn Dyson imgp->firstpage = NULL; 8051616db3cSJohn Dyson } 8061616db3cSJohn Dyson } 8071616db3cSJohn Dyson 80826f9a767SRodney W. Grimes /* 80926f9a767SRodney W. Grimes * Destroy old address space, and allocate a new stack 81026f9a767SRodney W. Grimes * The new stack is only SGROWSIZ large because it is grown 81126f9a767SRodney W. Grimes * automatically in trap.c. 81226f9a767SRodney W. Grimes */ 81326f9a767SRodney W. Grimes int 81405ba50f5SJake Burkholder exec_new_vmspace(imgp, sv) 815c52007c2SDavid Greenman struct image_params *imgp; 81605ba50f5SJake Burkholder struct sysentvec *sv; 81726f9a767SRodney W. Grimes { 81826f9a767SRodney W. Grimes int error; 8195e20c11fSAlan Cox struct proc *p = imgp->proc; 8205e20c11fSAlan Cox struct vmspace *vmspace = p->p_vmspace; 82105ba50f5SJake Burkholder vm_offset_t stack_addr; 82205ba50f5SJake Burkholder vm_map_t map; 82326f9a767SRodney W. Grimes 8240cddd8f0SMatthew Dillon GIANT_REQUIRED; 8250cddd8f0SMatthew Dillon 826c52007c2SDavid Greenman imgp->vmspace_destroyed = 1; 82726f9a767SRodney W. Grimes 82875b8b3b2SJohn Baldwin EVENTHANDLER_INVOKE(process_exec, p); 8296f5dafeaSAlan Cox 8306f5dafeaSAlan Cox /* 831c460ac3aSPeter Wemm * Here is as good a place as any to do any resource limit cleanups. 832c460ac3aSPeter Wemm * This is needed if a 64 bit binary exec's a 32 bit binary - the 833c460ac3aSPeter Wemm * data size limit may need to be changed to a value that makes 834c460ac3aSPeter Wemm * sense for the 32 bit binary. 835c460ac3aSPeter Wemm */ 836c460ac3aSPeter Wemm if (sv->sv_fixlimits) 837c460ac3aSPeter Wemm sv->sv_fixlimits(imgp); 838c460ac3aSPeter Wemm 839c460ac3aSPeter Wemm /* 840af9ec885SJohn Dyson * Blow away entire process VM, if address space not shared, 841af9ec885SJohn Dyson * otherwise, create a new VM space so that other threads are 842af9ec885SJohn Dyson * not disrupted 843af9ec885SJohn Dyson */ 84405ba50f5SJake Burkholder map = &vmspace->vm_map; 84505ba50f5SJake Burkholder if (vmspace->vm_refcnt == 1 && vm_map_min(map) == sv->sv_minuser && 84605ba50f5SJake Burkholder vm_map_max(map) == sv->sv_maxuser) { 8473db161e0SMatthew Dillon shmexit(vmspace); 8482d21129dSAlan Cox vm_page_lock_queues(); 84905ba50f5SJake Burkholder pmap_remove_pages(vmspace_pmap(vmspace), vm_map_min(map), 85005ba50f5SJake Burkholder vm_map_max(map)); 8512d21129dSAlan Cox vm_page_unlock_queues(); 85205ba50f5SJake Burkholder vm_map_remove(map, vm_map_min(map), vm_map_max(map)); 853af9ec885SJohn Dyson } else { 85405ba50f5SJake Burkholder vmspace_exec(p, sv->sv_minuser, sv->sv_maxuser); 8555e20c11fSAlan Cox vmspace = p->p_vmspace; 85605ba50f5SJake Burkholder map = &vmspace->vm_map; 857af9ec885SJohn Dyson } 85826f9a767SRodney W. Grimes 85926f9a767SRodney W. Grimes /* Allocate a new stack */ 860fd75d710SMarcel Moolenaar stack_addr = sv->sv_usrstack - maxssiz; 86105ba50f5SJake Burkholder error = vm_map_stack(map, stack_addr, (vm_size_t)maxssiz, 862fd75d710SMarcel Moolenaar sv->sv_stackprot, VM_PROT_ALL, MAP_STACK_GROWS_DOWN); 8632267af78SJulian Elischer if (error) 8642267af78SJulian Elischer return (error); 8652267af78SJulian Elischer 86663c47a5cSDoug Rabson #ifdef __ia64__ 867fd75d710SMarcel Moolenaar /* Allocate a new register stack */ 868bab1f052SMarcel Moolenaar stack_addr = IA64_BACKINGSTORE; 869fd75d710SMarcel Moolenaar error = vm_map_stack(map, stack_addr, (vm_size_t)maxssiz, 870fd75d710SMarcel Moolenaar sv->sv_stackprot, VM_PROT_ALL, MAP_STACK_GROWS_UP); 871fd75d710SMarcel Moolenaar if (error) 872fd75d710SMarcel Moolenaar return (error); 87363c47a5cSDoug Rabson #endif 87463c47a5cSDoug Rabson 8752267af78SJulian Elischer /* vm_ssize and vm_maxsaddr are somewhat antiquated concepts in the 8762267af78SJulian Elischer * VM_STACK case, but they are still used to monitor the size of the 8772267af78SJulian Elischer * process stack so we can check the stack rlimit. 8782267af78SJulian Elischer */ 879cbc89bfbSPaul Saab vmspace->vm_ssize = sgrowsiz >> PAGE_SHIFT; 88005ba50f5SJake Burkholder vmspace->vm_maxsaddr = (char *)sv->sv_usrstack - maxssiz; 88126f9a767SRodney W. Grimes 88226f9a767SRodney W. Grimes return (0); 88326f9a767SRodney W. Grimes } 88426f9a767SRodney W. Grimes 88526f9a767SRodney W. Grimes /* 88626f9a767SRodney W. Grimes * Copy out argument and environment strings from the old process 88726f9a767SRodney W. Grimes * address space into the temporary string buffer. 88826f9a767SRodney W. Grimes */ 88926f9a767SRodney W. Grimes int 890c52007c2SDavid Greenman exec_extract_strings(imgp) 891c52007c2SDavid Greenman struct image_params *imgp; 89226f9a767SRodney W. Grimes { 89326f9a767SRodney W. Grimes char **argv, **envv; 89426f9a767SRodney W. Grimes char *argp, *envp; 895ecbb00a2SDoug Rabson int error; 896ecbb00a2SDoug Rabson size_t length; 89726f9a767SRodney W. Grimes 89826f9a767SRodney W. Grimes /* 89926f9a767SRodney W. Grimes * extract arguments first 90026f9a767SRodney W. Grimes */ 90126f9a767SRodney W. Grimes 902450ffb44SRobert Watson argv = imgp->userspace_argv; 90326f9a767SRodney W. Grimes 9040fd1a014SDavid Greenman if (argv) { 905aae0aa45SBruce Evans argp = (caddr_t)(intptr_t)fuword(argv); 9065cf3d12cSAndrey A. Chernov if (argp == (caddr_t)-1) 9075cf3d12cSAndrey A. Chernov return (EFAULT); 9085cf3d12cSAndrey A. Chernov if (argp) 9095cf3d12cSAndrey A. Chernov argv++; 9105cf3d12cSAndrey A. Chernov if (imgp->argv0) 9115cf3d12cSAndrey A. Chernov argp = imgp->argv0; 9125cf3d12cSAndrey A. Chernov if (argp) { 9135cf3d12cSAndrey A. Chernov do { 91426f9a767SRodney W. Grimes if (argp == (caddr_t)-1) 91526f9a767SRodney W. Grimes return (EFAULT); 916c52007c2SDavid Greenman if ((error = copyinstr(argp, imgp->stringp, 917c52007c2SDavid Greenman imgp->stringspace, &length))) { 9180fd1a014SDavid Greenman if (error == ENAMETOOLONG) 91926f9a767SRodney W. Grimes return (E2BIG); 9200fd1a014SDavid Greenman return (error); 9210fd1a014SDavid Greenman } 922c52007c2SDavid Greenman imgp->stringspace -= length; 923c52007c2SDavid Greenman imgp->stringp += length; 924c52007c2SDavid Greenman imgp->argc++; 925aae0aa45SBruce Evans } while ((argp = (caddr_t)(intptr_t)fuword(argv++))); 92626f9a767SRodney W. Grimes } 9270fd1a014SDavid Greenman } 92826f9a767SRodney W. Grimes 929b9df5231SPoul-Henning Kamp imgp->endargs = imgp->stringp; 930b9df5231SPoul-Henning Kamp 93126f9a767SRodney W. Grimes /* 93226f9a767SRodney W. Grimes * extract environment strings 93326f9a767SRodney W. Grimes */ 93426f9a767SRodney W. Grimes 935450ffb44SRobert Watson envv = imgp->userspace_envv; 93626f9a767SRodney W. Grimes 9370fd1a014SDavid Greenman if (envv) { 938aae0aa45SBruce Evans while ((envp = (caddr_t)(intptr_t)fuword(envv++))) { 93926f9a767SRodney W. Grimes if (envp == (caddr_t)-1) 94026f9a767SRodney W. Grimes return (EFAULT); 941c52007c2SDavid Greenman if ((error = copyinstr(envp, imgp->stringp, 942c52007c2SDavid Greenman imgp->stringspace, &length))) { 9430fd1a014SDavid Greenman if (error == ENAMETOOLONG) 94426f9a767SRodney W. Grimes return (E2BIG); 9450fd1a014SDavid Greenman return (error); 9460fd1a014SDavid Greenman } 947c52007c2SDavid Greenman imgp->stringspace -= length; 948c52007c2SDavid Greenman imgp->stringp += length; 949c52007c2SDavid Greenman imgp->envc++; 95026f9a767SRodney W. Grimes } 9510fd1a014SDavid Greenman } 95226f9a767SRodney W. Grimes 95326f9a767SRodney W. Grimes return (0); 95426f9a767SRodney W. Grimes } 95526f9a767SRodney W. Grimes 95626f9a767SRodney W. Grimes /* 95726f9a767SRodney W. Grimes * Copy strings out to the new process address space, constructing 95826f9a767SRodney W. Grimes * new arg and env vector tables. Return a pointer to the base 95926f9a767SRodney W. Grimes * so that it can be used as the initial stack pointer. 96026f9a767SRodney W. Grimes */ 961654f6be1SBruce Evans register_t * 962c52007c2SDavid Greenman exec_copyout_strings(imgp) 963c52007c2SDavid Greenman struct image_params *imgp; 96426f9a767SRodney W. Grimes { 96526f9a767SRodney W. Grimes int argc, envc; 96626f9a767SRodney W. Grimes char **vectp; 96726f9a767SRodney W. Grimes char *stringp, *destp; 968654f6be1SBruce Evans register_t *stack_base; 96993f6448cSDavid Greenman struct ps_strings *arginfo; 970f3bec5d7SJake Burkholder struct proc *p; 971d66a5066SPeter Wemm int szsigcode; 97226f9a767SRodney W. Grimes 97326f9a767SRodney W. Grimes /* 97426f9a767SRodney W. Grimes * Calculate string base and vector table pointers. 975d66a5066SPeter Wemm * Also deal with signal trampoline code for this exec type. 97626f9a767SRodney W. Grimes */ 977f3bec5d7SJake Burkholder p = imgp->proc; 978f3bec5d7SJake Burkholder szsigcode = 0; 97905ba50f5SJake Burkholder arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 980f3bec5d7SJake Burkholder if (p->p_sysent->sv_szsigcode != NULL) 981f3bec5d7SJake Burkholder szsigcode = *(p->p_sysent->sv_szsigcode); 982d66a5066SPeter Wemm destp = (caddr_t)arginfo - szsigcode - SPARE_USRSPACE - 9831ed012f9SPeter Wemm roundup((ARG_MAX - imgp->stringspace), sizeof(char *)); 9841ed012f9SPeter Wemm 98526f9a767SRodney W. Grimes /* 986d66a5066SPeter Wemm * install sigcode 987d66a5066SPeter Wemm */ 988d66a5066SPeter Wemm if (szsigcode) 989f3bec5d7SJake Burkholder copyout(p->p_sysent->sv_sigcode, ((caddr_t)arginfo - 990f3bec5d7SJake Burkholder szsigcode), szsigcode); 991d66a5066SPeter Wemm 992d66a5066SPeter Wemm /* 993e1743d02SSøren Schmidt * If we have a valid auxargs ptr, prepare some room 994e1743d02SSøren Schmidt * on the stack. 995e1743d02SSøren Schmidt */ 996b9a22da4STakanori Watanabe if (imgp->auxargs) { 997e1743d02SSøren Schmidt /* 998b9a22da4STakanori Watanabe * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 999b9a22da4STakanori Watanabe * lower compatibility. 1000b9a22da4STakanori Watanabe */ 1001ca0387efSJake Burkholder imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : 1002ca0387efSJake Burkholder (AT_COUNT * 2); 1003b9a22da4STakanori Watanabe /* 1004b9a22da4STakanori Watanabe * The '+ 2' is for the null pointers at the end of each of 1005b9a22da4STakanori Watanabe * the arg and env vector sets,and imgp->auxarg_size is room 1006b9a22da4STakanori Watanabe * for argument of Runtime loader. 1007e1743d02SSøren Schmidt */ 1008e1743d02SSøren Schmidt vectp = (char **)(destp - (imgp->argc + imgp->envc + 2 + 1009b9a22da4STakanori Watanabe imgp->auxarg_size) * sizeof(char *)); 1010b9a22da4STakanori Watanabe 1011b9a22da4STakanori Watanabe } else 1012e1743d02SSøren Schmidt /* 1013b9a22da4STakanori Watanabe * The '+ 2' is for the null pointers at the end of each of 1014b9a22da4STakanori Watanabe * the arg and env vector sets 101526f9a767SRodney W. Grimes */ 1016ca0387efSJake Burkholder vectp = (char **)(destp - (imgp->argc + imgp->envc + 2) * 1017ca0387efSJake Burkholder sizeof(char *)); 101826f9a767SRodney W. Grimes 101926f9a767SRodney W. Grimes /* 102026f9a767SRodney W. Grimes * vectp also becomes our initial stack base 102126f9a767SRodney W. Grimes */ 1022654f6be1SBruce Evans stack_base = (register_t *)vectp; 102326f9a767SRodney W. Grimes 1024c52007c2SDavid Greenman stringp = imgp->stringbase; 1025c52007c2SDavid Greenman argc = imgp->argc; 1026c52007c2SDavid Greenman envc = imgp->envc; 102726f9a767SRodney W. Grimes 102893f6448cSDavid Greenman /* 10293aed948bSDavid Greenman * Copy out strings - arguments and environment. 103093f6448cSDavid Greenman */ 1031c52007c2SDavid Greenman copyout(stringp, destp, ARG_MAX - imgp->stringspace); 103293f6448cSDavid Greenman 103393f6448cSDavid Greenman /* 10343aed948bSDavid Greenman * Fill in "ps_strings" struct for ps, w, etc. 10353aed948bSDavid Greenman */ 1036aae0aa45SBruce Evans suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp); 10373aed948bSDavid Greenman suword(&arginfo->ps_nargvstr, argc); 10383aed948bSDavid Greenman 10393aed948bSDavid Greenman /* 10403aed948bSDavid Greenman * Fill in argument portion of vector table. 104193f6448cSDavid Greenman */ 104226f9a767SRodney W. Grimes for (; argc > 0; --argc) { 1043aae0aa45SBruce Evans suword(vectp++, (long)(intptr_t)destp); 10443aed948bSDavid Greenman while (*stringp++ != 0) 10453aed948bSDavid Greenman destp++; 10463aed948bSDavid Greenman destp++; 104726f9a767SRodney W. Grimes } 104826f9a767SRodney W. Grimes 10491a6e52d0SJeroen Ruigrok van der Werven /* a null vector table pointer separates the argp's from the envp's */ 10506ab46d52SBruce Evans suword(vectp++, 0); 105126f9a767SRodney W. Grimes 1052aae0aa45SBruce Evans suword(&arginfo->ps_envstr, (long)(intptr_t)vectp); 10533aed948bSDavid Greenman suword(&arginfo->ps_nenvstr, envc); 105493f6448cSDavid Greenman 105593f6448cSDavid Greenman /* 10563aed948bSDavid Greenman * Fill in environment portion of vector table. 105793f6448cSDavid Greenman */ 105826f9a767SRodney W. Grimes for (; envc > 0; --envc) { 1059aae0aa45SBruce Evans suword(vectp++, (long)(intptr_t)destp); 10603aed948bSDavid Greenman while (*stringp++ != 0) 10613aed948bSDavid Greenman destp++; 10623aed948bSDavid Greenman destp++; 106326f9a767SRodney W. Grimes } 106426f9a767SRodney W. Grimes 106526f9a767SRodney W. Grimes /* end of vector table is a null pointer */ 10666ab46d52SBruce Evans suword(vectp, 0); 106726f9a767SRodney W. Grimes 106826f9a767SRodney W. Grimes return (stack_base); 106926f9a767SRodney W. Grimes } 107026f9a767SRodney W. Grimes 107126f9a767SRodney W. Grimes /* 107226f9a767SRodney W. Grimes * Check permissions of file to execute. 1073cf64863aSRobert Watson * Called with imgp->vp locked. 107426f9a767SRodney W. Grimes * Return 0 for success or error code on failure. 107526f9a767SRodney W. Grimes */ 1076c8a79999SPeter Wemm int 1077c52007c2SDavid Greenman exec_check_permissions(imgp) 1078c52007c2SDavid Greenman struct image_params *imgp; 107926f9a767SRodney W. Grimes { 1080c52007c2SDavid Greenman struct vnode *vp = imgp->vp; 1081c52007c2SDavid Greenman struct vattr *attr = imgp->attr; 1082a854ed98SJohn Baldwin struct thread *td; 108326f9a767SRodney W. Grimes int error; 108426f9a767SRodney W. Grimes 1085a854ed98SJohn Baldwin td = curthread; /* XXXKSE */ 1086339b79b9SRobert Watson 1087ec35c2afSRobert Watson /* Get file attributes */ 1088ec35c2afSRobert Watson error = VOP_GETATTR(vp, attr, td->td_ucred, td); 1089ec35c2afSRobert Watson if (error) 1090ec35c2afSRobert Watson return (error); 1091ec35c2afSRobert Watson 1092339b79b9SRobert Watson #ifdef MAC 1093670cb89bSRobert Watson error = mac_check_vnode_exec(td->td_ucred, imgp->vp, imgp); 1094339b79b9SRobert Watson if (error) 1095339b79b9SRobert Watson return (error); 1096339b79b9SRobert Watson #endif 1097339b79b9SRobert Watson 109826f9a767SRodney W. Grimes /* 109926f9a767SRodney W. Grimes * 1) Check if file execution is disabled for the filesystem that this 110026f9a767SRodney W. Grimes * file resides on. 110126f9a767SRodney W. Grimes * 2) Insure that at least one execute bit is on - otherwise root 110226f9a767SRodney W. Grimes * will always succeed, and we don't want to happen unless the 110326f9a767SRodney W. Grimes * file really is executable. 110426f9a767SRodney W. Grimes * 3) Insure that the file is a regular file. 110526f9a767SRodney W. Grimes */ 1106c52007c2SDavid Greenman if ((vp->v_mount->mnt_flag & MNT_NOEXEC) || 110726f9a767SRodney W. Grimes ((attr->va_mode & 0111) == 0) || 1108a854ed98SJohn Baldwin (attr->va_type != VREG)) 110926f9a767SRodney W. Grimes return (EACCES); 111026f9a767SRodney W. Grimes 111126f9a767SRodney W. Grimes /* 111226f9a767SRodney W. Grimes * Zero length files can't be exec'd 111326f9a767SRodney W. Grimes */ 111426f9a767SRodney W. Grimes if (attr->va_size == 0) 111526f9a767SRodney W. Grimes return (ENOEXEC); 111626f9a767SRodney W. Grimes 111726f9a767SRodney W. Grimes /* 111826f9a767SRodney W. Grimes * Check for execute permission to file based on current credentials. 111926f9a767SRodney W. Grimes */ 1120a854ed98SJohn Baldwin error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td); 112126f9a767SRodney W. Grimes if (error) 112226f9a767SRodney W. Grimes return (error); 112326f9a767SRodney W. Grimes 11246d5a0a8cSDavid Greenman /* 11256d5a0a8cSDavid Greenman * Check number of open-for-writes on the file and deny execution 11266d5a0a8cSDavid Greenman * if there are any. 11276d5a0a8cSDavid Greenman */ 11286d5a0a8cSDavid Greenman if (vp->v_writecount) 11296d5a0a8cSDavid Greenman return (ETXTBSY); 11306d5a0a8cSDavid Greenman 11316d5a0a8cSDavid Greenman /* 11326d5a0a8cSDavid Greenman * Call filesystem specific open routine (which does nothing in the 11336d5a0a8cSDavid Greenman * general case). 11346d5a0a8cSDavid Greenman */ 1135a8d43c90SPoul-Henning Kamp error = VOP_OPEN(vp, FREAD, td->td_ucred, td, -1); 113626f9a767SRodney W. Grimes return (error); 1137df8bae1dSRodney W. Grimes } 1138aa855a59SPeter Wemm 1139aa855a59SPeter Wemm /* 1140aa855a59SPeter Wemm * Exec handler registration 1141aa855a59SPeter Wemm */ 1142aa855a59SPeter Wemm int 1143aa855a59SPeter Wemm exec_register(execsw_arg) 1144aa855a59SPeter Wemm const struct execsw *execsw_arg; 1145aa855a59SPeter Wemm { 1146aa855a59SPeter Wemm const struct execsw **es, **xs, **newexecsw; 1147aa855a59SPeter Wemm int count = 2; /* New slot and trailing NULL */ 1148aa855a59SPeter Wemm 1149aa855a59SPeter Wemm if (execsw) 1150aa855a59SPeter Wemm for (es = execsw; *es; es++) 1151aa855a59SPeter Wemm count++; 1152a163d034SWarner Losh newexecsw = malloc(count * sizeof(*es), M_TEMP, M_WAITOK); 1153aa855a59SPeter Wemm if (newexecsw == NULL) 1154a7cddfedSJake Burkholder return (ENOMEM); 1155aa855a59SPeter Wemm xs = newexecsw; 1156aa855a59SPeter Wemm if (execsw) 1157aa855a59SPeter Wemm for (es = execsw; *es; es++) 1158aa855a59SPeter Wemm *xs++ = *es; 1159aa855a59SPeter Wemm *xs++ = execsw_arg; 1160aa855a59SPeter Wemm *xs = NULL; 1161aa855a59SPeter Wemm if (execsw) 1162aa855a59SPeter Wemm free(execsw, M_TEMP); 1163aa855a59SPeter Wemm execsw = newexecsw; 1164a7cddfedSJake Burkholder return (0); 1165aa855a59SPeter Wemm } 1166aa855a59SPeter Wemm 1167aa855a59SPeter Wemm int 1168aa855a59SPeter Wemm exec_unregister(execsw_arg) 1169aa855a59SPeter Wemm const struct execsw *execsw_arg; 1170aa855a59SPeter Wemm { 1171aa855a59SPeter Wemm const struct execsw **es, **xs, **newexecsw; 1172aa855a59SPeter Wemm int count = 1; 1173aa855a59SPeter Wemm 1174aa855a59SPeter Wemm if (execsw == NULL) 1175aa855a59SPeter Wemm panic("unregister with no handlers left?\n"); 1176aa855a59SPeter Wemm 1177aa855a59SPeter Wemm for (es = execsw; *es; es++) { 1178aa855a59SPeter Wemm if (*es == execsw_arg) 1179aa855a59SPeter Wemm break; 1180aa855a59SPeter Wemm } 1181aa855a59SPeter Wemm if (*es == NULL) 1182a7cddfedSJake Burkholder return (ENOENT); 1183aa855a59SPeter Wemm for (es = execsw; *es; es++) 1184aa855a59SPeter Wemm if (*es != execsw_arg) 1185aa855a59SPeter Wemm count++; 1186a163d034SWarner Losh newexecsw = malloc(count * sizeof(*es), M_TEMP, M_WAITOK); 1187aa855a59SPeter Wemm if (newexecsw == NULL) 1188a7cddfedSJake Burkholder return (ENOMEM); 1189aa855a59SPeter Wemm xs = newexecsw; 1190aa855a59SPeter Wemm for (es = execsw; *es; es++) 1191aa855a59SPeter Wemm if (*es != execsw_arg) 1192aa855a59SPeter Wemm *xs++ = *es; 1193aa855a59SPeter Wemm *xs = NULL; 1194aa855a59SPeter Wemm if (execsw) 1195aa855a59SPeter Wemm free(execsw, M_TEMP); 1196aa855a59SPeter Wemm execsw = newexecsw; 1197a7cddfedSJake Burkholder return (0); 1198aa855a59SPeter Wemm } 1199