19454b2d8SWarner Losh /*- 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 3012bc222eSJonathan Anderson #include "opt_capsicum.h" 314da0d332SPeter Wemm #include "opt_hwpmc_hooks.h" 321e9b3d91SPeter Wemm #include "opt_ktrace.h" 33f8a47341SAlan Cox #include "opt_vm.h" 341e9b3d91SPeter Wemm 35df8bae1dSRodney W. Grimes #include <sys/param.h> 364a144410SRobert Watson #include <sys/capsicum.h> 3726f9a767SRodney W. Grimes #include <sys/systm.h> 3875b8b3b2SJohn Baldwin #include <sys/eventhandler.h> 39fb919e4dSMark Murray #include <sys/lock.h> 40fb919e4dSMark Murray #include <sys/mutex.h> 41d2d3e875SBruce Evans #include <sys/sysproto.h> 4226f9a767SRodney W. Grimes #include <sys/signalvar.h> 4326f9a767SRodney W. Grimes #include <sys/kernel.h> 4426f9a767SRodney W. Grimes #include <sys/mount.h> 45797f2d22SPoul-Henning Kamp #include <sys/filedesc.h> 46079cc25bSDavid Greenman #include <sys/fcntl.h> 4726f9a767SRodney W. Grimes #include <sys/acct.h> 4826f9a767SRodney W. Grimes #include <sys/exec.h> 4926f9a767SRodney W. Grimes #include <sys/imgact.h> 50e1743d02SSøren Schmidt #include <sys/imgact_elf.h> 5126f9a767SRodney W. Grimes #include <sys/wait.h> 52333ea485SGuido van Rooij #include <sys/malloc.h> 53acd3428bSRobert Watson #include <sys/priv.h> 54a794e791SBruce Evans #include <sys/proc.h> 552a024a2bSSean Eric Fagan #include <sys/pioctl.h> 56a794e791SBruce Evans #include <sys/namei.h> 576004362eSDavid Schultz #include <sys/resourcevar.h> 5889f6b863SAttilio Rao #include <sys/rwlock.h> 5944ad5475SJohn Baldwin #include <sys/sched.h> 605d217f17SJohn Birrell #include <sys/sdt.h> 6159c8bc40SAlan Cox #include <sys/sf_buf.h> 6284e0b075SDavid Xu #include <sys/syscallsubr.h> 631e1e0b44SSøren Schmidt #include <sys/sysent.h> 64797f2d22SPoul-Henning Kamp #include <sys/shm.h> 6599ac3bc8SPeter Wemm #include <sys/sysctl.h> 66a794e791SBruce Evans #include <sys/vnode.h> 67dfa7fd1dSEdward Tomasz Napierala #include <sys/stat.h> 68c781aea8SPeter Wemm #ifdef KTRACE 69c781aea8SPeter Wemm #include <sys/ktrace.h> 70c781aea8SPeter Wemm #endif 7126f9a767SRodney W. Grimes 7226f9a767SRodney W. Grimes #include <vm/vm.h> 73efeaf95aSDavid Greenman #include <vm/vm_param.h> 74efeaf95aSDavid Greenman #include <vm/pmap.h> 751616db3cSJohn Dyson #include <vm/vm_page.h> 76efeaf95aSDavid Greenman #include <vm/vm_map.h> 7726f9a767SRodney W. Grimes #include <vm/vm_kern.h> 78efeaf95aSDavid Greenman #include <vm/vm_extern.h> 791ebd0c59SDavid Greenman #include <vm/vm_object.h> 801616db3cSJohn Dyson #include <vm/vm_pager.h> 8126f9a767SRodney W. Grimes 82ebccf1e3SJoseph Koshy #ifdef HWPMC_HOOKS 83ebccf1e3SJoseph Koshy #include <sys/pmckern.h> 84ebccf1e3SJoseph Koshy #endif 85ebccf1e3SJoseph Koshy 8626f9a767SRodney W. Grimes #include <machine/reg.h> 8726f9a767SRodney W. Grimes 88ae1078d6SWayne Salamon #include <security/audit/audit.h> 89aed55708SRobert Watson #include <security/mac/mac_framework.h> 90ae1078d6SWayne Salamon 915d217f17SJohn Birrell #ifdef KDTRACE_HOOKS 925d217f17SJohn Birrell #include <sys/dtrace_bsd.h> 935d217f17SJohn Birrell dtrace_execexit_func_t dtrace_fasttrap_exec; 945d217f17SJohn Birrell #endif 955d217f17SJohn Birrell 965d217f17SJohn Birrell SDT_PROVIDER_DECLARE(proc); 97d9fae5abSAndriy Gapon SDT_PROBE_DEFINE1(proc, kernel, , exec, "char *"); 98d9fae5abSAndriy Gapon SDT_PROBE_DEFINE1(proc, kernel, , exec__failure, "int"); 99d9fae5abSAndriy Gapon SDT_PROBE_DEFINE1(proc, kernel, , exec__success, "char *"); 1005d217f17SJohn Birrell 101b9df5231SPoul-Henning Kamp MALLOC_DEFINE(M_PARGS, "proc-args", "Process arguments"); 102b9df5231SPoul-Henning Kamp 10305ba50f5SJake Burkholder static int sysctl_kern_ps_strings(SYSCTL_HANDLER_ARGS); 10405ba50f5SJake Burkholder static int sysctl_kern_usrstack(SYSCTL_HANDLER_ARGS); 1055dadd17bSJake Burkholder static int sysctl_kern_stackprot(SYSCTL_HANDLER_ARGS); 106610ecfe0SMaxim Sobolev static int do_execve(struct thread *td, struct image_args *args, 107610ecfe0SMaxim Sobolev struct mac *mac_p); 10805ba50f5SJake Burkholder 1099701cd40SJohn Baldwin /* XXX This should be vm_size_t. */ 11005ba50f5SJake Burkholder SYSCTL_PROC(_kern, KERN_PS_STRINGS, ps_strings, CTLTYPE_ULONG|CTLFLAG_RD, 11105ba50f5SJake Burkholder NULL, 0, sysctl_kern_ps_strings, "LU", ""); 112486bddb0SDoug Rabson 1139701cd40SJohn Baldwin /* XXX This should be vm_size_t. */ 114ff66f6a4SRobert Watson SYSCTL_PROC(_kern, KERN_USRSTACK, usrstack, CTLTYPE_ULONG|CTLFLAG_RD| 115ff66f6a4SRobert Watson CTLFLAG_CAPRD, NULL, 0, sysctl_kern_usrstack, "LU", ""); 11699ac3bc8SPeter Wemm 1175dadd17bSJake Burkholder SYSCTL_PROC(_kern, OID_AUTO, stackprot, CTLTYPE_INT|CTLFLAG_RD, 1185dadd17bSJake Burkholder NULL, 0, sysctl_kern_stackprot, "I", ""); 1195dadd17bSJake Burkholder 120b9df5231SPoul-Henning Kamp u_long ps_arg_cache_limit = PAGE_SIZE / 16; 121c3699b5fSPeter Wemm SYSCTL_ULONG(_kern, OID_AUTO, ps_arg_cache_limit, CTLFLAG_RW, 1229701cd40SJohn Baldwin &ps_arg_cache_limit, 0, ""); 123b9df5231SPoul-Henning Kamp 124eda6009cSKonstantin Belousov static int disallow_high_osrel; 125eda6009cSKonstantin Belousov SYSCTL_INT(_kern, OID_AUTO, disallow_high_osrel, CTLFLAG_RW, 126eda6009cSKonstantin Belousov &disallow_high_osrel, 0, 127eda6009cSKonstantin Belousov "Disallow execution of binaries built for higher version of the world"); 128eda6009cSKonstantin Belousov 129878adb85SBjoern A. Zeeb static int map_at_zero = 0; 130af3b2549SHans Petter Selasky SYSCTL_INT(_security_bsd, OID_AUTO, map_at_zero, CTLFLAG_RWTUN, &map_at_zero, 0, 131878adb85SBjoern A. Zeeb "Permit processes to map an object at virtual address 0."); 132878adb85SBjoern A. Zeeb 13305ba50f5SJake Burkholder static int 13405ba50f5SJake Burkholder sysctl_kern_ps_strings(SYSCTL_HANDLER_ARGS) 13505ba50f5SJake Burkholder { 13605ba50f5SJake Burkholder struct proc *p; 137df7c361eSPeter Wemm int error; 13805ba50f5SJake Burkholder 13905ba50f5SJake Burkholder p = curproc; 140a7bc3102SPeter Wemm #ifdef SCTL_MASK32 141a7bc3102SPeter Wemm if (req->flags & SCTL_MASK32) { 142df7c361eSPeter Wemm unsigned int val; 143df7c361eSPeter Wemm val = (unsigned int)p->p_sysent->sv_psstrings; 144df7c361eSPeter Wemm error = SYSCTL_OUT(req, &val, sizeof(val)); 145df7c361eSPeter Wemm } else 146df7c361eSPeter Wemm #endif 147df7c361eSPeter Wemm error = SYSCTL_OUT(req, &p->p_sysent->sv_psstrings, 148df7c361eSPeter Wemm sizeof(p->p_sysent->sv_psstrings)); 149df7c361eSPeter Wemm return error; 15005ba50f5SJake Burkholder } 15105ba50f5SJake Burkholder 15205ba50f5SJake Burkholder static int 15305ba50f5SJake Burkholder sysctl_kern_usrstack(SYSCTL_HANDLER_ARGS) 15405ba50f5SJake Burkholder { 15505ba50f5SJake Burkholder struct proc *p; 156df7c361eSPeter Wemm int error; 15705ba50f5SJake Burkholder 15805ba50f5SJake Burkholder p = curproc; 159a7bc3102SPeter Wemm #ifdef SCTL_MASK32 160a7bc3102SPeter Wemm if (req->flags & SCTL_MASK32) { 161df7c361eSPeter Wemm unsigned int val; 162df7c361eSPeter Wemm val = (unsigned int)p->p_sysent->sv_usrstack; 163df7c361eSPeter Wemm error = SYSCTL_OUT(req, &val, sizeof(val)); 164df7c361eSPeter Wemm } else 165df7c361eSPeter Wemm #endif 166df7c361eSPeter Wemm error = SYSCTL_OUT(req, &p->p_sysent->sv_usrstack, 167df7c361eSPeter Wemm sizeof(p->p_sysent->sv_usrstack)); 168df7c361eSPeter Wemm return error; 16905ba50f5SJake Burkholder } 17005ba50f5SJake Burkholder 1715dadd17bSJake Burkholder static int 1725dadd17bSJake Burkholder sysctl_kern_stackprot(SYSCTL_HANDLER_ARGS) 1735dadd17bSJake Burkholder { 1745dadd17bSJake Burkholder struct proc *p; 1755dadd17bSJake Burkholder 1765dadd17bSJake Burkholder p = curproc; 1775dadd17bSJake Burkholder return (SYSCTL_OUT(req, &p->p_sysent->sv_stackprot, 1785dadd17bSJake Burkholder sizeof(p->p_sysent->sv_stackprot))); 1795dadd17bSJake Burkholder } 1805dadd17bSJake Burkholder 18199ac3bc8SPeter Wemm /* 182aa855a59SPeter Wemm * Each of the items is a pointer to a `const struct execsw', hence the 183aa855a59SPeter Wemm * double pointer here. 184df8bae1dSRodney W. Grimes */ 185aa855a59SPeter Wemm static const struct execsw **execsw; 18626f9a767SRodney W. Grimes 187ca46e90eSBruce Evans #ifndef _SYS_SYSPROTO_H_ 188ca46e90eSBruce Evans struct execve_args { 189ca46e90eSBruce Evans char *fname; 190ca46e90eSBruce Evans char **argv; 191ca46e90eSBruce Evans char **envv; 192ca46e90eSBruce Evans }; 193ca46e90eSBruce Evans #endif 194ca46e90eSBruce Evans 195ca46e90eSBruce Evans int 1967b445033SKonstantin Belousov sys_execve(struct thread *td, struct execve_args *uap) 197ca46e90eSBruce Evans { 198610ecfe0SMaxim Sobolev struct image_args args; 1997b445033SKonstantin Belousov struct vmspace *oldvmspace; 2007b445033SKonstantin Belousov int error; 201ca46e90eSBruce Evans 2027b445033SKonstantin Belousov error = pre_execve(td, &oldvmspace); 2037b445033SKonstantin Belousov if (error != 0) 2047b445033SKonstantin Belousov return (error); 205610ecfe0SMaxim Sobolev error = exec_copyin_args(&args, uap->fname, UIO_USERSPACE, 206610ecfe0SMaxim Sobolev uap->argv, uap->envv); 207610ecfe0SMaxim Sobolev if (error == 0) 208610ecfe0SMaxim Sobolev error = kern_execve(td, &args, NULL); 2097b445033SKonstantin Belousov post_execve(td, error, oldvmspace); 210610ecfe0SMaxim Sobolev return (error); 211ca46e90eSBruce Evans } 212ca46e90eSBruce Evans 213ca46e90eSBruce Evans #ifndef _SYS_SYSPROTO_H_ 214632dbc19SKonstantin Belousov struct fexecve_args { 215632dbc19SKonstantin Belousov int fd; 216632dbc19SKonstantin Belousov char **argv; 217632dbc19SKonstantin Belousov char **envv; 218632dbc19SKonstantin Belousov } 219632dbc19SKonstantin Belousov #endif 220632dbc19SKonstantin Belousov int 2218451d0ddSKip Macy sys_fexecve(struct thread *td, struct fexecve_args *uap) 222632dbc19SKonstantin Belousov { 223632dbc19SKonstantin Belousov struct image_args args; 2247b445033SKonstantin Belousov struct vmspace *oldvmspace; 2257b445033SKonstantin Belousov int error; 226632dbc19SKonstantin Belousov 2277b445033SKonstantin Belousov error = pre_execve(td, &oldvmspace); 2287b445033SKonstantin Belousov if (error != 0) 2297b445033SKonstantin Belousov return (error); 230632dbc19SKonstantin Belousov error = exec_copyin_args(&args, NULL, UIO_SYSSPACE, 231632dbc19SKonstantin Belousov uap->argv, uap->envv); 232632dbc19SKonstantin Belousov if (error == 0) { 233632dbc19SKonstantin Belousov args.fd = uap->fd; 234632dbc19SKonstantin Belousov error = kern_execve(td, &args, NULL); 235632dbc19SKonstantin Belousov } 2367b445033SKonstantin Belousov post_execve(td, error, oldvmspace); 237632dbc19SKonstantin Belousov return (error); 238632dbc19SKonstantin Belousov } 239632dbc19SKonstantin Belousov 240632dbc19SKonstantin Belousov #ifndef _SYS_SYSPROTO_H_ 241ca46e90eSBruce Evans struct __mac_execve_args { 242ca46e90eSBruce Evans char *fname; 243ca46e90eSBruce Evans char **argv; 244ca46e90eSBruce Evans char **envv; 245ca46e90eSBruce Evans struct mac *mac_p; 246ca46e90eSBruce Evans }; 247ca46e90eSBruce Evans #endif 248ca46e90eSBruce Evans 249ca46e90eSBruce Evans int 2507b445033SKonstantin Belousov sys___mac_execve(struct thread *td, struct __mac_execve_args *uap) 251ca46e90eSBruce Evans { 252ca46e90eSBruce Evans #ifdef MAC 253610ecfe0SMaxim Sobolev struct image_args args; 2547b445033SKonstantin Belousov struct vmspace *oldvmspace; 2557b445033SKonstantin Belousov int error; 256610ecfe0SMaxim Sobolev 2577b445033SKonstantin Belousov error = pre_execve(td, &oldvmspace); 2587b445033SKonstantin Belousov if (error != 0) 2597b445033SKonstantin Belousov return (error); 260610ecfe0SMaxim Sobolev error = exec_copyin_args(&args, uap->fname, UIO_USERSPACE, 261610ecfe0SMaxim Sobolev uap->argv, uap->envv); 262610ecfe0SMaxim Sobolev if (error == 0) 263610ecfe0SMaxim Sobolev error = kern_execve(td, &args, uap->mac_p); 2647b445033SKonstantin Belousov post_execve(td, error, oldvmspace); 265610ecfe0SMaxim Sobolev return (error); 266ca46e90eSBruce Evans #else 267ca46e90eSBruce Evans return (ENOSYS); 268ca46e90eSBruce Evans #endif 269ca46e90eSBruce Evans } 270ca46e90eSBruce Evans 27184e0b075SDavid Xu int 2727b445033SKonstantin Belousov pre_execve(struct thread *td, struct vmspace **oldvmspace) 273906ac69dSDavid Xu { 2747b445033SKonstantin Belousov struct proc *p; 275906ac69dSDavid Xu int error; 276906ac69dSDavid Xu 2777b445033SKonstantin Belousov KASSERT(td == curthread, ("non-current thread %p", td)); 2787b445033SKonstantin Belousov error = 0; 2797b445033SKonstantin Belousov p = td->td_proc; 2807b445033SKonstantin Belousov if ((p->p_flag & P_HADTHREADS) != 0) { 281906ac69dSDavid Xu PROC_LOCK(p); 2827b445033SKonstantin Belousov if (thread_single(p, SINGLE_BOUNDARY) != 0) 2837b445033SKonstantin Belousov error = ERESTART; 284906ac69dSDavid Xu PROC_UNLOCK(p); 285906ac69dSDavid Xu } 2867b445033SKonstantin Belousov KASSERT(error != 0 || (td->td_pflags & TDP_EXECVMSPC) == 0, 2877b445033SKonstantin Belousov ("nested execve")); 2887b445033SKonstantin Belousov *oldvmspace = p->p_vmspace; 2897b445033SKonstantin Belousov return (error); 2907b445033SKonstantin Belousov } 291906ac69dSDavid Xu 2927b445033SKonstantin Belousov void 2937b445033SKonstantin Belousov post_execve(struct thread *td, int error, struct vmspace *oldvmspace) 2947b445033SKonstantin Belousov { 2957b445033SKonstantin Belousov struct proc *p; 296906ac69dSDavid Xu 2977b445033SKonstantin Belousov KASSERT(td == curthread, ("non-current thread %p", td)); 2987b445033SKonstantin Belousov p = td->td_proc; 2997b445033SKonstantin Belousov if ((p->p_flag & P_HADTHREADS) != 0) { 300906ac69dSDavid Xu PROC_LOCK(p); 301906ac69dSDavid Xu /* 302906ac69dSDavid Xu * If success, we upgrade to SINGLE_EXIT state to 303906ac69dSDavid Xu * force other threads to suicide. 304906ac69dSDavid Xu */ 305906ac69dSDavid Xu if (error == 0) 3066ddcc233SKonstantin Belousov thread_single(p, SINGLE_EXIT); 307906ac69dSDavid Xu else 3086ddcc233SKonstantin Belousov thread_single_end(p, SINGLE_BOUNDARY); 309906ac69dSDavid Xu PROC_UNLOCK(p); 310906ac69dSDavid Xu } 3117032434eSKonstantin Belousov if ((td->td_pflags & TDP_EXECVMSPC) != 0) { 3127b445033SKonstantin Belousov KASSERT(p->p_vmspace != oldvmspace, 3137032434eSKonstantin Belousov ("oldvmspace still used")); 3147032434eSKonstantin Belousov vmspace_free(oldvmspace); 3157032434eSKonstantin Belousov td->td_pflags &= ~TDP_EXECVMSPC; 3167032434eSKonstantin Belousov } 3177b445033SKonstantin Belousov } 318906ac69dSDavid Xu 3197b445033SKonstantin Belousov /* 3207b445033SKonstantin Belousov * XXX: kern_execve has the astonishing property of not always returning to 3217b445033SKonstantin Belousov * the caller. If sufficiently bad things happen during the call to 3227b445033SKonstantin Belousov * do_execve(), it can end up calling exit1(); as a result, callers must 3237b445033SKonstantin Belousov * avoid doing anything which they might need to undo (e.g., allocating 3247b445033SKonstantin Belousov * memory). 3257b445033SKonstantin Belousov */ 3267b445033SKonstantin Belousov int 3277b445033SKonstantin Belousov kern_execve(struct thread *td, struct image_args *args, struct mac *mac_p) 3287b445033SKonstantin Belousov { 3297b445033SKonstantin Belousov 3307b445033SKonstantin Belousov AUDIT_ARG_ARGV(args->begin_argv, args->argc, 3317b445033SKonstantin Belousov args->begin_envv - args->begin_argv); 3327b445033SKonstantin Belousov AUDIT_ARG_ENVV(args->begin_envv, args->envc, 3337b445033SKonstantin Belousov args->endp - args->begin_envv); 3347b445033SKonstantin Belousov return (do_execve(td, args, mac_p)); 335906ac69dSDavid Xu } 336906ac69dSDavid Xu 33726f9a767SRodney W. Grimes /* 338450ffb44SRobert Watson * In-kernel implementation of execve(). All arguments are assumed to be 339450ffb44SRobert Watson * userspace pointers from the passed thread. 34026f9a767SRodney W. Grimes */ 341450ffb44SRobert Watson static int 342610ecfe0SMaxim Sobolev do_execve(td, args, mac_p) 343b40ce416SJulian Elischer struct thread *td; 344610ecfe0SMaxim Sobolev struct image_args *args; 345670cb89bSRobert Watson struct mac *mac_p; 346df8bae1dSRodney W. Grimes { 347b40ce416SJulian Elischer struct proc *p = td->td_proc; 34869c9eff8SEd Schouten struct nameidata nd; 3499b3b1c5fSJohn Baldwin struct ucred *newcred = NULL, *oldcred; 350350d5181SMateusz Guzik struct uidinfo *euip = NULL; 351654f6be1SBruce Evans register_t *stack_base; 3525ca4819dSJohn Baldwin int error, i; 353c52007c2SDavid Greenman struct image_params image_params, *imgp; 3549f5c1d19SDiomidis Spinellis struct vattr attr; 3554d77a549SAlfred Perlstein int (*img_first)(struct image_params *); 35669be5db9SAlfred Perlstein struct pargs *oldargs = NULL, *newargs = NULL; 35790af4afaSJohn Baldwin struct sigacts *oldsigacts, *newsigacts; 3586c84de02SJohn Baldwin #ifdef KTRACE 3596c84de02SJohn Baldwin struct vnode *tracevp = NULL; 360a5881ea5SJohn Baldwin struct ucred *tracecred = NULL; 3616c84de02SJohn Baldwin #endif 36261617058SMateusz Guzik struct vnode *oldtextvp = NULL, *newtextvp; 3637008be5bSPawel Jakub Dawidek cap_rights_t rights; 364d06c0d4dSRobert Watson int credential_changing; 365619eb6e5SJeff Roberson int textset; 366ccafe7ebSRobert Watson #ifdef MAC 3676356dba0SRobert Watson struct label *interpvplabel = NULL; 368eca8a663SRobert Watson int will_transition; 369ccafe7ebSRobert Watson #endif 37015139246SJoseph Koshy #ifdef HWPMC_HOOKS 37115139246SJoseph Koshy struct pmckern_procexec pe; 37215139246SJoseph Koshy #endif 373632dbc19SKonstantin Belousov static const char fexecv_proc_title[] = "(fexecv)"; 37426f9a767SRodney W. Grimes 375c52007c2SDavid Greenman imgp = &image_params; 376df8bae1dSRodney W. Grimes 3779ca45e81SDag-Erling Smørgrav /* 3789ca45e81SDag-Erling Smørgrav * Lock the process and set the P_INEXEC flag to indicate that 3799ca45e81SDag-Erling Smørgrav * it should be left alone until we're done here. This is 3809ca45e81SDag-Erling Smørgrav * necessary to avoid race conditions - e.g. in ptrace() - 3819ca45e81SDag-Erling Smørgrav * that might allow a local user to illicitly obtain elevated 3829ca45e81SDag-Erling Smørgrav * privileges. 3839ca45e81SDag-Erling Smørgrav */ 3849ca45e81SDag-Erling Smørgrav PROC_LOCK(p); 3859ca45e81SDag-Erling Smørgrav KASSERT((p->p_flag & P_INEXEC) == 0, 38691f91617SDavid E. O'Brien ("%s(): process already has P_INEXEC flag", __func__)); 3879ca45e81SDag-Erling Smørgrav p->p_flag |= P_INEXEC; 3889ca45e81SDag-Erling Smørgrav PROC_UNLOCK(p); 3899ca45e81SDag-Erling Smørgrav 390df8bae1dSRodney W. Grimes /* 391c52007c2SDavid Greenman * Initialize part of the common data 392df8bae1dSRodney W. Grimes */ 3938e572983SMateusz Guzik bzero(imgp, sizeof(*imgp)); 394c52007c2SDavid Greenman imgp->proc = p; 395c52007c2SDavid Greenman imgp->attr = &attr; 396610ecfe0SMaxim Sobolev imgp->args = args; 39726f9a767SRodney W. Grimes 398670cb89bSRobert Watson #ifdef MAC 399eca8a663SRobert Watson error = mac_execve_enter(imgp, mac_p); 400532c491bSJeff Roberson if (error) 401670cb89bSRobert Watson goto exec_fail; 402670cb89bSRobert Watson #endif 403670cb89bSRobert Watson 40426f9a767SRodney W. Grimes /* 40526f9a767SRodney W. Grimes * Translate the file name. namei() returns a vnode pointer 40626f9a767SRodney W. Grimes * in ni_vp amoung other things. 407ae1078d6SWayne Salamon * 408ae1078d6SWayne Salamon * XXXAUDIT: It would be desirable to also audit the name of the 409ae1078d6SWayne Salamon * interpreter if this is an interpreted binary. 41026f9a767SRodney W. Grimes */ 411632dbc19SKonstantin Belousov if (args->fname != NULL) { 41269c9eff8SEd Schouten NDINIT(&nd, LOOKUP, ISOPEN | LOCKLEAF | FOLLOW | SAVENAME 4135050aa86SKonstantin Belousov | AUDITVNODE1, UIO_SYSSPACE, args->fname, td); 414632dbc19SKonstantin Belousov } 41526f9a767SRodney W. Grimes 416e506f34bSCraig Rodrigues SDT_PROBE(proc, kernel, , exec, args->fname, 0, 0, 0, 0 ); 417e506f34bSCraig Rodrigues 41826f9a767SRodney W. Grimes interpret: 419632dbc19SKonstantin Belousov if (args->fname != NULL) { 42012bc222eSJonathan Anderson #ifdef CAPABILITY_MODE 42112bc222eSJonathan Anderson /* 42212bc222eSJonathan Anderson * While capability mode can't reach this point via direct 42312bc222eSJonathan Anderson * path arguments to execve(), we also don't allow 42412bc222eSJonathan Anderson * interpreters to be used in capability mode (for now). 42512bc222eSJonathan Anderson * Catch indirect lookups and return a permissions error. 42612bc222eSJonathan Anderson */ 42712bc222eSJonathan Anderson if (IN_CAPABILITY_MODE(td)) { 42812bc222eSJonathan Anderson error = ECAPMODE; 42912bc222eSJonathan Anderson goto exec_fail; 43012bc222eSJonathan Anderson } 43112bc222eSJonathan Anderson #endif 43269c9eff8SEd Schouten error = namei(&nd); 433610ecfe0SMaxim Sobolev if (error) 43426f9a767SRodney W. Grimes goto exec_fail; 43526f9a767SRodney W. Grimes 43661617058SMateusz Guzik newtextvp = nd.ni_vp; 43761617058SMateusz Guzik imgp->vp = newtextvp; 438632dbc19SKonstantin Belousov } else { 43914961ba7SRobert Watson AUDIT_ARG_FD(args->fd); 440a9d2f8d8SRobert Watson /* 441c8e781f6SPawel Jakub Dawidek * Descriptors opened only with O_EXEC or O_RDONLY are allowed. 442a9d2f8d8SRobert Watson */ 4437008be5bSPawel Jakub Dawidek error = fgetvp_exec(td, args->fd, 44461617058SMateusz Guzik cap_rights_init(&rights, CAP_FEXECVE), &newtextvp); 445632dbc19SKonstantin Belousov if (error) 446632dbc19SKonstantin Belousov goto exec_fail; 44761617058SMateusz Guzik vn_lock(newtextvp, LK_EXCLUSIVE | LK_RETRY); 44861617058SMateusz Guzik AUDIT_ARG_VNODE1(newtextvp); 44961617058SMateusz Guzik imgp->vp = newtextvp; 450632dbc19SKonstantin Belousov } 45126f9a767SRodney W. Grimes 45226f9a767SRodney W. Grimes /* 4539022e4adSDavid Greenman * Check file permissions (also 'opens' file) 4549022e4adSDavid Greenman */ 455c52007c2SDavid Greenman error = exec_check_permissions(imgp); 456619eb6e5SJeff Roberson if (error) 45726f9a767SRodney W. Grimes goto exec_fail_dealloc; 458619eb6e5SJeff Roberson 4598516dd18SPoul-Henning Kamp imgp->object = imgp->vp->v_object; 4608516dd18SPoul-Henning Kamp if (imgp->object != NULL) 4610b2ed1aeSJeff Roberson vm_object_reference(imgp->object); 46226f9a767SRodney W. Grimes 463619eb6e5SJeff Roberson /* 464619eb6e5SJeff Roberson * Set VV_TEXT now so no one can write to the executable while we're 465619eb6e5SJeff Roberson * activating it. 466619eb6e5SJeff Roberson * 467619eb6e5SJeff Roberson * Remember if this was set before and unset it in case this is not 468619eb6e5SJeff Roberson * actually an executable image. 469619eb6e5SJeff Roberson */ 470877d24acSKonstantin Belousov textset = VOP_IS_TEXT(imgp->vp); 471877d24acSKonstantin Belousov VOP_SET_TEXT(imgp->vp); 472619eb6e5SJeff Roberson 4731616db3cSJohn Dyson error = exec_map_first_page(imgp); 4746d5a0a8cSDavid Greenman if (error) 47526f9a767SRodney W. Grimes goto exec_fail_dealloc; 47626f9a767SRodney W. Grimes 477f231de47SKonstantin Belousov imgp->proc->p_osrel = 0; 47826f9a767SRodney W. Grimes /* 479d323ddf3SMatthew Dillon * If the current process has a special image activator it 480d323ddf3SMatthew Dillon * wants to try first, call it. For example, emulating shell 481d323ddf3SMatthew Dillon * scripts differently. 48226f9a767SRodney W. Grimes */ 483d323ddf3SMatthew Dillon error = -1; 484d323ddf3SMatthew Dillon if ((img_first = imgp->proc->p_sysent->sv_imgact_try) != NULL) 485d323ddf3SMatthew Dillon error = img_first(imgp); 486d323ddf3SMatthew Dillon 487d323ddf3SMatthew Dillon /* 488d323ddf3SMatthew Dillon * Loop through the list of image activators, calling each one. 489d323ddf3SMatthew Dillon * An activator returns -1 if there is no match, 0 on success, 490d323ddf3SMatthew Dillon * and an error otherwise. 491d323ddf3SMatthew Dillon */ 492d323ddf3SMatthew Dillon for (i = 0; error == -1 && execsw[i]; ++i) { 493d323ddf3SMatthew Dillon if (execsw[i]->ex_imgact == NULL || 494d323ddf3SMatthew Dillon execsw[i]->ex_imgact == img_first) { 495d323ddf3SMatthew Dillon continue; 496d323ddf3SMatthew Dillon } 497c52007c2SDavid Greenman error = (*execsw[i]->ex_imgact)(imgp); 498d323ddf3SMatthew Dillon } 499d323ddf3SMatthew Dillon 500d323ddf3SMatthew Dillon if (error) { 501619eb6e5SJeff Roberson if (error == -1) { 502877d24acSKonstantin Belousov if (textset == 0) 503877d24acSKonstantin Belousov VOP_UNSET_TEXT(imgp->vp); 504d323ddf3SMatthew Dillon error = ENOEXEC; 505619eb6e5SJeff Roberson } 50626f9a767SRodney W. Grimes goto exec_fail_dealloc; 507d323ddf3SMatthew Dillon } 508d323ddf3SMatthew Dillon 509d323ddf3SMatthew Dillon /* 510d323ddf3SMatthew Dillon * Special interpreter operation, cleanup and loop up to try to 511d323ddf3SMatthew Dillon * activate the interpreter. 512d323ddf3SMatthew Dillon */ 513c52007c2SDavid Greenman if (imgp->interpreted) { 5141616db3cSJohn Dyson exec_unmap_first_page(imgp); 515619eb6e5SJeff Roberson /* 516619eb6e5SJeff Roberson * VV_TEXT needs to be unset for scripts. There is a short 517619eb6e5SJeff Roberson * period before we determine that something is a script where 518619eb6e5SJeff Roberson * VV_TEXT will be set. The vnode lock is held over this 519619eb6e5SJeff Roberson * entire period so nothing should illegitimately be blocked. 520619eb6e5SJeff Roberson */ 521877d24acSKonstantin Belousov VOP_UNSET_TEXT(imgp->vp); 522762e6b85SEivind Eklund /* free name buffer and old vnode */ 523632dbc19SKonstantin Belousov if (args->fname != NULL) 52469c9eff8SEd Schouten NDFREE(&nd, NDF_ONLY_PNBUF); 525670cb89bSRobert Watson #ifdef MAC 52661617058SMateusz Guzik mac_execve_interpreter_enter(newtextvp, &interpvplabel); 527670cb89bSRobert Watson #endif 5289a75ea23SKonstantin Belousov if (imgp->opened) { 52961617058SMateusz Guzik VOP_CLOSE(newtextvp, FREAD, td->td_ucred, td); 5309a75ea23SKonstantin Belousov imgp->opened = 0; 5319a75ea23SKonstantin Belousov } 53261617058SMateusz Guzik vput(newtextvp); 5330b2ed1aeSJeff Roberson vm_object_deallocate(imgp->object); 5340b2ed1aeSJeff Roberson imgp->object = NULL; 53526f9a767SRodney W. Grimes /* set new name to that of the interpreter */ 5365050aa86SKonstantin Belousov NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW | SAVENAME, 537b40ce416SJulian Elischer UIO_SYSSPACE, imgp->interpreter_name, td); 538632dbc19SKonstantin Belousov args->fname = imgp->interpreter_name; 53926f9a767SRodney W. Grimes goto interpret; 54026f9a767SRodney W. Grimes } 54126f9a767SRodney W. Grimes 54226f9a767SRodney W. Grimes /* 543ded7d39cSChristian S.J. Peron * NB: We unlock the vnode here because it is believed that none 544ded7d39cSChristian S.J. Peron * of the sv_copyout_strings/sv_fixup operations require the vnode. 545ded7d39cSChristian S.J. Peron */ 546ded7d39cSChristian S.J. Peron VOP_UNLOCK(imgp->vp, 0); 5473ff06357SKonstantin Belousov 5483ff06357SKonstantin Belousov /* 5493ff06357SKonstantin Belousov * Do the best to calculate the full path to the image file. 5503ff06357SKonstantin Belousov */ 5513ff06357SKonstantin Belousov if (imgp->auxargs != NULL && 5523ff06357SKonstantin Belousov ((args->fname != NULL && args->fname[0] == '/') || 5533ff06357SKonstantin Belousov vn_fullpath(td, imgp->vp, &imgp->execpath, &imgp->freepath) != 0)) 5543ff06357SKonstantin Belousov imgp->execpath = args->fname; 5553ff06357SKonstantin Belousov 556eda6009cSKonstantin Belousov if (disallow_high_osrel && 557eda6009cSKonstantin Belousov P_OSREL_MAJOR(p->p_osrel) > P_OSREL_MAJOR(__FreeBSD_version)) { 558eda6009cSKonstantin Belousov error = ENOEXEC; 559eda6009cSKonstantin Belousov uprintf("Osrel %d for image %s too high\n", p->p_osrel, 560eda6009cSKonstantin Belousov imgp->execpath != NULL ? imgp->execpath : "<unresolved>"); 561eda6009cSKonstantin Belousov vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 562eda6009cSKonstantin Belousov goto exec_fail_dealloc; 563eda6009cSKonstantin Belousov } 564eda6009cSKonstantin Belousov 565ded7d39cSChristian S.J. Peron /* 56626f9a767SRodney W. Grimes * Copy out strings (args and env) and initialize stack base 56726f9a767SRodney W. Grimes */ 5683ebc1248SPeter Wemm if (p->p_sysent->sv_copyout_strings) 5693ebc1248SPeter Wemm stack_base = (*p->p_sysent->sv_copyout_strings)(imgp); 5703ebc1248SPeter Wemm else 571c52007c2SDavid Greenman stack_base = exec_copyout_strings(imgp); 57226f9a767SRodney W. Grimes 57326f9a767SRodney W. Grimes /* 5741e1e0b44SSøren Schmidt * If custom stack fixup routine present for this process 5751e1e0b44SSøren Schmidt * let it do the stack setup. 5761e1e0b44SSøren Schmidt * Else stuff argument count as first item on stack 57726f9a767SRodney W. Grimes */ 578d6c847f3SBruce Evans if (p->p_sysent->sv_fixup != NULL) 579c52007c2SDavid Greenman (*p->p_sysent->sv_fixup)(&stack_base, imgp); 5801e1e0b44SSøren Schmidt else 581610ecfe0SMaxim Sobolev suword(--stack_base, imgp->args->argc); 58226f9a767SRodney W. Grimes 583457f7e23SEd Schouten if (args->fdp != NULL) { 584457f7e23SEd Schouten /* Install a brand new file descriptor table. */ 585457f7e23SEd Schouten fdinstall_remapped(td, args->fdp); 586457f7e23SEd Schouten args->fdp = NULL; 587457f7e23SEd Schouten } else { 588a78e8d2aSDavid Greenman /* 589457f7e23SEd Schouten * Keep on using the existing file descriptor table. For 590457f7e23SEd Schouten * security and other reasons, the file descriptor table 591457f7e23SEd Schouten * cannot be shared after an exec. 592a78e8d2aSDavid Greenman */ 593b9d32c36SMateusz Guzik fdunshare(td); 594b0bc0cadSMateusz Guzik /* close files on exec */ 595b0bc0cadSMateusz Guzik fdcloseexec(td); 596457f7e23SEd Schouten } 597a78e8d2aSDavid Greenman 598333ea485SGuido van Rooij /* 5999b3b1c5fSJohn Baldwin * Malloc things before we need locks. 6009b3b1c5fSJohn Baldwin */ 601610ecfe0SMaxim Sobolev i = imgp->args->begin_envv - imgp->args->begin_argv; 6025997cae9SDon Lewis /* Cache arguments if they fit inside our allowance */ 6035997cae9SDon Lewis if (ps_arg_cache_limit >= i + sizeof(struct pargs)) { 6049b3b1c5fSJohn Baldwin newargs = pargs_alloc(i); 6055997cae9SDon Lewis bcopy(imgp->args->begin_argv, newargs->ar_args, i); 6065997cae9SDon Lewis } 6079b3b1c5fSJohn Baldwin 6082974cc36SKonstantin Belousov vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 6099b3b1c5fSJohn Baldwin 6109b3b1c5fSJohn Baldwin /* 611333ea485SGuido van Rooij * For security and other reasons, signal handlers cannot 6128688bb93SJohn Baldwin * be shared after an exec. The new process gets a copy of the old 613b2c3fa70SDima Dorfman * handlers. In execsigs(), the new process will have its signals 614333ea485SGuido van Rooij * reset. 615333ea485SGuido van Rooij */ 61690af4afaSJohn Baldwin if (sigacts_shared(p->p_sigacts)) { 61790af4afaSJohn Baldwin oldsigacts = p->p_sigacts; 61890af4afaSJohn Baldwin newsigacts = sigacts_alloc(); 61990af4afaSJohn Baldwin sigacts_copy(newsigacts, oldsigacts); 620a6bad85eSMateusz Guzik } else { 62190af4afaSJohn Baldwin oldsigacts = NULL; 622a6bad85eSMateusz Guzik newsigacts = NULL; /* satisfy gcc */ 623a6bad85eSMateusz Guzik } 624333ea485SGuido van Rooij 625d00c8ea4SMateusz Guzik PROC_LOCK(p); 626d00c8ea4SMateusz Guzik if (oldsigacts) 627d00c8ea4SMateusz Guzik p->p_sigacts = newsigacts; 628350d5181SMateusz Guzik oldcred = p->p_ucred; 629fdf4e8b3SWarner Losh /* Stop profiling */ 630fdf4e8b3SWarner Losh stopprofclock(p); 631fdf4e8b3SWarner Losh 63226f9a767SRodney W. Grimes /* reset caught signals */ 63326f9a767SRodney W. Grimes execsigs(p); 63426f9a767SRodney W. Grimes 63526f9a767SRodney W. Grimes /* name this process - nameiexec(p, ndp) */ 6365ca4819dSJohn Baldwin bzero(p->p_comm, sizeof(p->p_comm)); 6375ca4819dSJohn Baldwin if (args->fname) 6385ca4819dSJohn Baldwin bcopy(nd.ni_cnd.cn_nameptr, p->p_comm, 6395ca4819dSJohn Baldwin min(nd.ni_cnd.cn_namelen, MAXCOMLEN)); 64061617058SMateusz Guzik else if (vn_commname(newtextvp, p->p_comm, sizeof(p->p_comm)) != 0) 6415ca4819dSJohn Baldwin bcopy(fexecv_proc_title, p->p_comm, sizeof(fexecv_proc_title)); 642ca081fdbSJulian Elischer bcopy(p->p_comm, td->td_name, sizeof(td->td_name)); 64344ad5475SJohn Baldwin #ifdef KTR 64444ad5475SJohn Baldwin sched_clear_tdname(td); 64544ad5475SJohn Baldwin #endif 64626f9a767SRodney W. Grimes 64726f9a767SRodney W. Grimes /* 64824b34f09SSujal Patel * mark as execed, wakeup the process that vforked (if any) and tell 649dc733423SDag-Erling Smørgrav * it that it now has its own resources back 65026f9a767SRodney W. Grimes */ 65126f9a767SRodney W. Grimes p->p_flag |= P_EXEC; 652677258f7SKonstantin Belousov if ((p->p_flag2 & P2_NOTRACE_EXEC) == 0) 653677258f7SKonstantin Belousov p->p_flag2 &= ~P2_NOTRACE; 654965d0860SMateusz Guzik if (p->p_flag & P_PPWAIT) { 655888d4d4fSKonstantin Belousov p->p_flag &= ~(P_PPWAIT | P_PPTRACE); 656aeb32571SKonstantin Belousov cv_broadcast(&p->p_pwait); 65726f9a767SRodney W. Grimes } 65826f9a767SRodney W. Grimes 65926f9a767SRodney W. Grimes /* 660a78e8d2aSDavid Greenman * Implement image setuid/setgid. 661a78e8d2aSDavid Greenman * 662a78e8d2aSDavid Greenman * Don't honor setuid/setgid if the filesystem prohibits it or if 663a78e8d2aSDavid Greenman * the process is being traced. 664670cb89bSRobert Watson * 66512bc222eSJonathan Anderson * We disable setuid/setgid/etc in compatibility mode on the basis 66612bc222eSJonathan Anderson * that most setugid applications are not written with that 66712bc222eSJonathan Anderson * environment in mind, and will therefore almost certainly operate 66812bc222eSJonathan Anderson * incorrectly. In principle there's no reason that setugid 66912bc222eSJonathan Anderson * applications might not be useful in capability mode, so we may want 67012bc222eSJonathan Anderson * to reconsider this conservative design choice in the future. 67112bc222eSJonathan Anderson * 672670cb89bSRobert Watson * XXXMAC: For the time being, use NOSUID to also prohibit 673670cb89bSRobert Watson * transitions on the file system. 674c52007c2SDavid Greenman */ 675d06c0d4dSRobert Watson credential_changing = 0; 676dfa7fd1dSEdward Tomasz Napierala credential_changing |= (attr.va_mode & S_ISUID) && oldcred->cr_uid != 677d06c0d4dSRobert Watson attr.va_uid; 678dfa7fd1dSEdward Tomasz Napierala credential_changing |= (attr.va_mode & S_ISGID) && oldcred->cr_gid != 679d06c0d4dSRobert Watson attr.va_gid; 680ccafe7ebSRobert Watson #ifdef MAC 68130d239bcSRobert Watson will_transition = mac_vnode_execve_will_transition(oldcred, imgp->vp, 6826356dba0SRobert Watson interpvplabel, imgp); 683ccafe7ebSRobert Watson credential_changing |= will_transition; 684ccafe7ebSRobert Watson #endif 685d06c0d4dSRobert Watson 686d06c0d4dSRobert Watson if (credential_changing && 68712bc222eSJonathan Anderson #ifdef CAPABILITY_MODE 68812bc222eSJonathan Anderson ((oldcred->cr_flags & CRED_FLAG_CAPMODE) == 0) && 68912bc222eSJonathan Anderson #endif 690a78e8d2aSDavid Greenman (imgp->vp->v_mount->mnt_flag & MNT_NOSUID) == 0 && 691c52007c2SDavid Greenman (p->p_flag & P_TRACED) == 0) { 692c52007c2SDavid Greenman /* 693c52007c2SDavid Greenman * Turn off syscall tracing for set-id programs, except for 694b85db196SPeter Wemm * root. Record any set-id flags first to make sure that 695b85db196SPeter Wemm * we do not regain any tracing during a possible block. 69626f9a767SRodney W. Grimes */ 697b85db196SPeter Wemm setsugid(p); 698acd3428bSRobert Watson 6996c84de02SJohn Baldwin #ifdef KTRACE 700c331c970SAndriy Gapon if (p->p_tracecred != NULL && 701c331c970SAndriy Gapon priv_check_cred(p->p_tracecred, PRIV_DEBUG_DIFFCRED, 0)) 702d680caabSJohn Baldwin ktrprocexec(p, &tracecred, &tracevp); 7036c84de02SJohn Baldwin #endif 70428b325aaSDon Lewis /* 705c1e2d386SNate Lawson * Close any file descriptors 0..2 that reference procfs, 706c1e2d386SNate Lawson * then make sure file descriptors 0..2 are in use. 70728b325aaSDon Lewis * 7088a5177ccSMateusz Guzik * Both fdsetugidsafety() and fdcheckstd() may call functions 7098a5177ccSMateusz Guzik * taking sleepable locks, so temporarily drop our locks. 71028b325aaSDon Lewis */ 71128b325aaSDon Lewis PROC_UNLOCK(p); 71222db15c0SAttilio Rao VOP_UNLOCK(imgp->vp, 0); 71311888da8SMateusz Guzik fdsetugidsafety(td); 714e983a376SJacques Vidrine error = fdcheckstd(td); 71563c9e754SJohn Baldwin if (error != 0) 71669be5db9SAlfred Perlstein goto done1; 717350d5181SMateusz Guzik newcred = crdup(oldcred); 718350d5181SMateusz Guzik euip = uifind(attr.va_uid); 7195e2554b7SMateusz Guzik vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 720e1b1aa3bSJohn Baldwin PROC_LOCK(p); 721c52007c2SDavid Greenman /* 722c52007c2SDavid Greenman * Set the new credentials. 723c52007c2SDavid Greenman */ 724dfa7fd1dSEdward Tomasz Napierala if (attr.va_mode & S_ISUID) 7251419eacbSAlfred Perlstein change_euid(newcred, euip); 726dfa7fd1dSEdward Tomasz Napierala if (attr.va_mode & S_ISGID) 727b1fc0ec1SRobert Watson change_egid(newcred, attr.va_gid); 728ccafe7ebSRobert Watson #ifdef MAC 729670cb89bSRobert Watson if (will_transition) { 73030d239bcSRobert Watson mac_vnode_execve_transition(oldcred, newcred, imgp->vp, 7316356dba0SRobert Watson interpvplabel, imgp); 732670cb89bSRobert Watson } 733ccafe7ebSRobert Watson #endif 7349b3b1c5fSJohn Baldwin /* 7359b3b1c5fSJohn Baldwin * Implement correct POSIX saved-id behavior. 736ccafe7ebSRobert Watson * 737ccafe7ebSRobert Watson * XXXMAC: Note that the current logic will save the 738ccafe7ebSRobert Watson * uid and gid if a MAC domain transition occurs, even 739ccafe7ebSRobert Watson * though maybe it shouldn't. 7409b3b1c5fSJohn Baldwin */ 7419b3b1c5fSJohn Baldwin change_svuid(newcred, newcred->cr_uid); 7429b3b1c5fSJohn Baldwin change_svgid(newcred, newcred->cr_gid); 743daf63fd2SMateusz Guzik proc_set_cred(p, newcred); 744c52007c2SDavid Greenman } else { 745b1fc0ec1SRobert Watson if (oldcred->cr_uid == oldcred->cr_ruid && 746b1fc0ec1SRobert Watson oldcred->cr_gid == oldcred->cr_rgid) 747c52007c2SDavid Greenman p->p_flag &= ~P_SUGID; 74826f9a767SRodney W. Grimes /* 749c52007c2SDavid Greenman * Implement correct POSIX saved-id behavior. 750b1fc0ec1SRobert Watson * 751b1fc0ec1SRobert Watson * XXX: It's not clear that the existing behavior is 7529b3b1c5fSJohn Baldwin * POSIX-compliant. A number of sources indicate that the 7539b3b1c5fSJohn Baldwin * saved uid/gid should only be updated if the new ruid is 7549b3b1c5fSJohn Baldwin * not equal to the old ruid, or the new euid is not equal 7559b3b1c5fSJohn Baldwin * to the old euid and the new euid is not equal to the old 7569b3b1c5fSJohn Baldwin * ruid. The FreeBSD code always updates the saved uid/gid. 7579b3b1c5fSJohn Baldwin * Also, this code uses the new (replaced) euid and egid as 7589b3b1c5fSJohn Baldwin * the source, which may or may not be the right ones to use. 75926f9a767SRodney W. Grimes */ 760b1fc0ec1SRobert Watson if (oldcred->cr_svuid != oldcred->cr_uid || 761b1fc0ec1SRobert Watson oldcred->cr_svgid != oldcred->cr_gid) { 762350d5181SMateusz Guzik PROC_UNLOCK(p); 7635e2554b7SMateusz Guzik VOP_UNLOCK(imgp->vp, 0); 764350d5181SMateusz Guzik newcred = crdup(oldcred); 7655e2554b7SMateusz Guzik vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 766350d5181SMateusz Guzik PROC_LOCK(p); 767b1fc0ec1SRobert Watson change_svuid(newcred, newcred->cr_uid); 768b1fc0ec1SRobert Watson change_svgid(newcred, newcred->cr_gid); 769daf63fd2SMateusz Guzik proc_set_cred(p, newcred); 7709b3b1c5fSJohn Baldwin } 771b1fc0ec1SRobert Watson } 77226f9a767SRodney W. Grimes 77326f9a767SRodney W. Grimes /* 774853be5ffSMateusz Guzik * Store the vp for use in procfs. This vnode was referenced by namei 775853be5ffSMateusz Guzik * or fgetvp_exec. 7762a531c80SDavid Greenman */ 77761617058SMateusz Guzik oldtextvp = p->p_textvp; 77861617058SMateusz Guzik p->p_textvp = newtextvp; 7792a531c80SDavid Greenman 7805d217f17SJohn Birrell #ifdef KDTRACE_HOOKS 7815d217f17SJohn Birrell /* 7825d217f17SJohn Birrell * Tell the DTrace fasttrap provider about the exec if it 7835d217f17SJohn Birrell * has declared an interest. 7845d217f17SJohn Birrell */ 7855d217f17SJohn Birrell if (dtrace_fasttrap_exec) 7865d217f17SJohn Birrell dtrace_fasttrap_exec(p); 7875d217f17SJohn Birrell #endif 7885d217f17SJohn Birrell 7892a531c80SDavid Greenman /* 7909ca45e81SDag-Erling Smørgrav * Notify others that we exec'd, and clear the P_INEXEC flag 7919ca45e81SDag-Erling Smørgrav * as we're now a bona fide freshly-execed process. 792cb679c38SJonathan Lemon */ 793ad3b9257SJohn-Mark Gurney KNOTE_LOCKED(&p->p_klist, NOTE_EXEC); 7949ca45e81SDag-Erling Smørgrav p->p_flag &= ~P_INEXEC; 795cb679c38SJonathan Lemon 79626f9a767SRodney W. Grimes /* clear "fork but no exec" flag, as we _are_ execing */ 79726f9a767SRodney W. Grimes p->p_acflag &= ~AFORK; 79826f9a767SRodney W. Grimes 7995997cae9SDon Lewis /* 80034ea500bSDon Lewis * Free any previous argument cache and replace it with 8015997cae9SDon Lewis * the new argument cache, if any. 8025997cae9SDon Lewis */ 8039b3b1c5fSJohn Baldwin oldargs = p->p_args; 804e1b1aa3bSJohn Baldwin p->p_args = newargs; 805e1b1aa3bSJohn Baldwin newargs = NULL; 806ebccf1e3SJoseph Koshy 807ebccf1e3SJoseph Koshy #ifdef HWPMC_HOOKS 808ebccf1e3SJoseph Koshy /* 809f263522aSJoseph Koshy * Check if system-wide sampling is in effect or if the 810f263522aSJoseph Koshy * current process is using PMCs. If so, do exec() time 811ebccf1e3SJoseph Koshy * processing. This processing needs to happen AFTER the 812ebccf1e3SJoseph Koshy * P_INEXEC flag is cleared. 813ebccf1e3SJoseph Koshy * 814ebccf1e3SJoseph Koshy * The proc lock needs to be released before taking the PMC 815ebccf1e3SJoseph Koshy * SX. 816ebccf1e3SJoseph Koshy */ 817f263522aSJoseph Koshy if (PMC_SYSTEM_SAMPLING_ACTIVE() || PMC_PROC_IS_USING_PMCS(p)) { 818e1b1aa3bSJohn Baldwin PROC_UNLOCK(p); 8191ef6ea9bSKonstantin Belousov VOP_UNLOCK(imgp->vp, 0); 82015139246SJoseph Koshy pe.pm_credentialschanged = credential_changing; 82115139246SJoseph Koshy pe.pm_entryaddr = imgp->entry_addr; 82215139246SJoseph Koshy 82315139246SJoseph Koshy PMC_CALL_HOOK_X(td, PMC_FN_PROCESS_EXEC, (void *) &pe); 8242974cc36SKonstantin Belousov vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 825ebccf1e3SJoseph Koshy } else 826ebccf1e3SJoseph Koshy PROC_UNLOCK(p); 827ebccf1e3SJoseph Koshy #else /* !HWPMC_HOOKS */ 828ebccf1e3SJoseph Koshy PROC_UNLOCK(p); 829ebccf1e3SJoseph Koshy #endif 830e1b1aa3bSJohn Baldwin 831e913ca22SDoug Rabson /* Set values passed into the program in registers. */ 8323ebc1248SPeter Wemm if (p->p_sysent->sv_setregs) 833a107d8aaSNathan Whitehorn (*p->p_sysent->sv_setregs)(td, imgp, 834a107d8aaSNathan Whitehorn (u_long)(uintptr_t)stack_base); 8353ebc1248SPeter Wemm else 836a107d8aaSNathan Whitehorn exec_setregs(td, imgp, (u_long)(uintptr_t)stack_base); 837e913ca22SDoug Rabson 8380359a12eSAttilio Rao vfs_mark_atime(imgp->vp, td->td_ucred); 8396341095eSKen Smith 840d9fae5abSAndriy Gapon SDT_PROBE(proc, kernel, , exec__success, args->fname, 0, 0, 0, 0); 8415d217f17SJohn Birrell 8425e2554b7SMateusz Guzik VOP_UNLOCK(imgp->vp, 0); 843e506f34bSCraig Rodrigues done1: 8449b3b1c5fSJohn Baldwin /* 8459b3b1c5fSJohn Baldwin * Free any resources malloc'd earlier that we didn't use. 8469b3b1c5fSJohn Baldwin */ 847350d5181SMateusz Guzik if (euip != NULL) 8481419eacbSAlfred Perlstein uifree(euip); 849350d5181SMateusz Guzik if (newcred != NULL) 8509b3b1c5fSJohn Baldwin crfree(oldcred); 8515d217f17SJohn Birrell 8529b3b1c5fSJohn Baldwin /* 8539b3b1c5fSJohn Baldwin * Handle deferred decrement of ref counts. 8549b3b1c5fSJohn Baldwin */ 85561617058SMateusz Guzik if (oldtextvp != NULL) 85661617058SMateusz Guzik vrele(oldtextvp); 8576c84de02SJohn Baldwin #ifdef KTRACE 8585050aa86SKonstantin Belousov if (tracevp != NULL) 8599b3b1c5fSJohn Baldwin vrele(tracevp); 860a5881ea5SJohn Baldwin if (tracecred != NULL) 861a5881ea5SJohn Baldwin crfree(tracecred); 8626c84de02SJohn Baldwin #endif 8632974cc36SKonstantin Belousov vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 8649b3b1c5fSJohn Baldwin pargs_drop(oldargs); 86569be5db9SAlfred Perlstein pargs_drop(newargs); 86690af4afaSJohn Baldwin if (oldsigacts != NULL) 86790af4afaSJohn Baldwin sigacts_free(oldsigacts); 868b9df5231SPoul-Henning Kamp 8691616db3cSJohn Dyson exec_fail_dealloc: 8701616db3cSJohn Dyson 87126f9a767SRodney W. Grimes /* 87226f9a767SRodney W. Grimes * free various allocated resources 87326f9a767SRodney W. Grimes */ 874d6c847f3SBruce Evans if (imgp->firstpage != NULL) 8751616db3cSJohn Dyson exec_unmap_first_page(imgp); 87626f9a767SRodney W. Grimes 877d6c847f3SBruce Evans if (imgp->vp != NULL) { 878632dbc19SKonstantin Belousov if (args->fname) 87969c9eff8SEd Schouten NDFREE(&nd, NDF_ONLY_PNBUF); 8809a75ea23SKonstantin Belousov if (imgp->opened) 8819a75ea23SKonstantin Belousov VOP_CLOSE(imgp->vp, FREAD, td->td_ucred, td); 882853be5ffSMateusz Guzik if (error != 0) 883619eb6e5SJeff Roberson vput(imgp->vp); 884853be5ffSMateusz Guzik else 885853be5ffSMateusz Guzik VOP_UNLOCK(imgp->vp, 0); 886a3cf6ebaSDavid Greenman } 88726f9a767SRodney W. Grimes 888d6c847f3SBruce Evans if (imgp->object != NULL) 8890b2ed1aeSJeff Roberson vm_object_deallocate(imgp->object); 8900b2ed1aeSJeff Roberson 8913ff06357SKonstantin Belousov free(imgp->freepath, M_TEMP); 8923ff06357SKonstantin Belousov 893d1989db5SRobert Drehmel if (error == 0) { 894afe1a688SKonstantin Belousov PROC_LOCK(p); 895afe1a688SKonstantin Belousov td->td_dbgflags |= TDB_EXEC; 896afe1a688SKonstantin Belousov PROC_UNLOCK(p); 897afe1a688SKonstantin Belousov 898d1989db5SRobert Drehmel /* 899d1989db5SRobert Drehmel * Stop the process here if its stop event mask has 900d1989db5SRobert Drehmel * the S_EXEC bit set. 901d1989db5SRobert Drehmel */ 902d1989db5SRobert Drehmel STOPEVENT(p, S_EXEC, 0); 903116734c4SMatthew Dillon goto done2; 904d1989db5SRobert Drehmel } 9051616db3cSJohn Dyson 90626f9a767SRodney W. Grimes exec_fail: 9079ca45e81SDag-Erling Smørgrav /* we're done here, clear P_INEXEC */ 9089ca45e81SDag-Erling Smørgrav PROC_LOCK(p); 9099ca45e81SDag-Erling Smørgrav p->p_flag &= ~P_INEXEC; 9109ca45e81SDag-Erling Smørgrav PROC_UNLOCK(p); 9119ca45e81SDag-Erling Smørgrav 912d9fae5abSAndriy Gapon SDT_PROBE(proc, kernel, , exec__failure, error, 0, 0, 0, 0); 9135d217f17SJohn Birrell 914116734c4SMatthew Dillon done2: 915670cb89bSRobert Watson #ifdef MAC 916670cb89bSRobert Watson mac_execve_exit(imgp); 9176356dba0SRobert Watson mac_execve_interpreter_exit(interpvplabel); 918670cb89bSRobert Watson #endif 9198917b8d2SJohn Baldwin exec_free_args(args); 9208917b8d2SJohn Baldwin 9218917b8d2SJohn Baldwin if (error && imgp->vmspace_destroyed) { 9228917b8d2SJohn Baldwin /* sorry, no more process anymore. exit gracefully */ 923*b4490c6eSKonstantin Belousov exit1(td, 0, SIGABRT); 9248917b8d2SJohn Baldwin /* NOT REACHED */ 9258917b8d2SJohn Baldwin } 9267705d4b2SDmitry Chagin 9277705d4b2SDmitry Chagin #ifdef KTRACE 9287705d4b2SDmitry Chagin if (error == 0) 9297705d4b2SDmitry Chagin ktrprocctor(p); 9307705d4b2SDmitry Chagin #endif 9317705d4b2SDmitry Chagin 932116734c4SMatthew Dillon return (error); 93326f9a767SRodney W. Grimes } 93426f9a767SRodney W. Grimes 9351616db3cSJohn Dyson int 9361616db3cSJohn Dyson exec_map_first_page(imgp) 9371616db3cSJohn Dyson struct image_params *imgp; 9381616db3cSJohn Dyson { 939d8aad40cSJohn Baldwin int rv, i; 94095461b45SJohn Dyson int initial_pagein; 94195461b45SJohn Dyson vm_page_t ma[VM_INITIAL_PAGEIN]; 9421616db3cSJohn Dyson vm_object_t object; 9431616db3cSJohn Dyson 944d6c847f3SBruce Evans if (imgp->firstpage != NULL) 9451616db3cSJohn Dyson exec_unmap_first_page(imgp); 9461616db3cSJohn Dyson 9478516dd18SPoul-Henning Kamp object = imgp->vp->v_object; 9484d7d2993SJeff Roberson if (object == NULL) 9494d7d2993SJeff Roberson return (EACCES); 95089f6b863SAttilio Rao VM_OBJECT_WLOCK(object); 951f8a47341SAlan Cox #if VM_NRESERVLEVEL > 0 9523d653db0SAlan Cox vm_object_color(object, 0); 953f8a47341SAlan Cox #endif 9545944de8eSKonstantin Belousov ma[0] = vm_page_grab(object, 0, VM_ALLOC_NORMAL); 9550a2e596aSAlan Cox if (ma[0]->valid != VM_PAGE_BITS_ALL) { 95695461b45SJohn Dyson initial_pagein = VM_INITIAL_PAGEIN; 95795461b45SJohn Dyson if (initial_pagein > object->size) 95895461b45SJohn Dyson initial_pagein = object->size; 95995461b45SJohn Dyson for (i = 1; i < initial_pagein; i++) { 96041890423SAlan Cox if ((ma[i] = vm_page_next(ma[i - 1])) != NULL) { 9616ec2fca5SAlan Cox if (ma[i]->valid) 9626ec2fca5SAlan Cox break; 963c7aebda8SAttilio Rao if (vm_page_tryxbusy(ma[i])) 96406fa71cdSAlan Cox break; 96595461b45SJohn Dyson } else { 966ca0387efSJake Burkholder ma[i] = vm_page_alloc(object, i, 9677bfda801SAlan Cox VM_ALLOC_NORMAL | VM_ALLOC_IFNOTCACHED); 96895461b45SJohn Dyson if (ma[i] == NULL) 96995461b45SJohn Dyson break; 97095461b45SJohn Dyson } 97195461b45SJohn Dyson } 97295461b45SJohn Dyson initial_pagein = i; 97395461b45SJohn Dyson rv = vm_pager_get_pages(object, ma, initial_pagein, 0); 974093c7f39SGleb Smirnoff if (rv != VM_PAGER_OK) { 9755ac59343SAlan Cox vm_page_lock(ma[0]); 9768f9110f6SJohn Dyson vm_page_free(ma[0]); 9775ac59343SAlan Cox vm_page_unlock(ma[0]); 97889f6b863SAttilio Rao VM_OBJECT_WUNLOCK(object); 979a7cddfedSJake Burkholder return (EIO); 9801616db3cSJohn Dyson } 9811616db3cSJohn Dyson } 982c7aebda8SAttilio Rao vm_page_xunbusy(ma[0]); 9832965a453SKip Macy vm_page_lock(ma[0]); 984be996836SAttilio Rao vm_page_hold(ma[0]); 98570978c93SKonstantin Belousov vm_page_activate(ma[0]); 9862965a453SKip Macy vm_page_unlock(ma[0]); 98789f6b863SAttilio Rao VM_OBJECT_WUNLOCK(object); 9881616db3cSJohn Dyson 98959c8bc40SAlan Cox imgp->firstpage = sf_buf_alloc(ma[0], 0); 99059c8bc40SAlan Cox imgp->image_header = (char *)sf_buf_kva(imgp->firstpage); 9911616db3cSJohn Dyson 992a7cddfedSJake Burkholder return (0); 9931616db3cSJohn Dyson } 9941616db3cSJohn Dyson 9951616db3cSJohn Dyson void 9961616db3cSJohn Dyson exec_unmap_first_page(imgp) 9971616db3cSJohn Dyson struct image_params *imgp; 9981616db3cSJohn Dyson { 99959c8bc40SAlan Cox vm_page_t m; 100023955314SAlfred Perlstein 1001d6c847f3SBruce Evans if (imgp->firstpage != NULL) { 100259c8bc40SAlan Cox m = sf_buf_page(imgp->firstpage); 100359c8bc40SAlan Cox sf_buf_free(imgp->firstpage); 10041616db3cSJohn Dyson imgp->firstpage = NULL; 10052965a453SKip Macy vm_page_lock(m); 1006be996836SAttilio Rao vm_page_unhold(m); 10072965a453SKip Macy vm_page_unlock(m); 10081616db3cSJohn Dyson } 10091616db3cSJohn Dyson } 10101616db3cSJohn Dyson 101126f9a767SRodney W. Grimes /* 101226f9a767SRodney W. Grimes * Destroy old address space, and allocate a new stack 101326f9a767SRodney W. Grimes * The new stack is only SGROWSIZ large because it is grown 101426f9a767SRodney W. Grimes * automatically in trap.c. 101526f9a767SRodney W. Grimes */ 101626f9a767SRodney W. Grimes int 101705ba50f5SJake Burkholder exec_new_vmspace(imgp, sv) 1018c52007c2SDavid Greenman struct image_params *imgp; 101905ba50f5SJake Burkholder struct sysentvec *sv; 102026f9a767SRodney W. Grimes { 102126f9a767SRodney W. Grimes int error; 10225e20c11fSAlan Cox struct proc *p = imgp->proc; 10235e20c11fSAlan Cox struct vmspace *vmspace = p->p_vmspace; 10246297a3d8SKonstantin Belousov vm_object_t obj; 1025316b3843SKonstantin Belousov struct rlimit rlim_stack; 1026878adb85SBjoern A. Zeeb vm_offset_t sv_minuser, stack_addr; 102705ba50f5SJake Burkholder vm_map_t map; 102859d8f3ffSJohn Baldwin u_long ssiz; 102926f9a767SRodney W. Grimes 1030c52007c2SDavid Greenman imgp->vmspace_destroyed = 1; 1031993182e5SAlexander Leidinger imgp->sysent = sv; 103226f9a767SRodney W. Grimes 1033bd37fd72SKris Kennaway /* May be called with Giant held */ 1034993182e5SAlexander Leidinger EVENTHANDLER_INVOKE(process_exec, p, imgp); 10356f5dafeaSAlan Cox 10366f5dafeaSAlan Cox /* 1037af9ec885SJohn Dyson * Blow away entire process VM, if address space not shared, 1038af9ec885SJohn Dyson * otherwise, create a new VM space so that other threads are 1039af9ec885SJohn Dyson * not disrupted 1040af9ec885SJohn Dyson */ 104105ba50f5SJake Burkholder map = &vmspace->vm_map; 1042878adb85SBjoern A. Zeeb if (map_at_zero) 1043878adb85SBjoern A. Zeeb sv_minuser = sv->sv_minuser; 1044878adb85SBjoern A. Zeeb else 1045878adb85SBjoern A. Zeeb sv_minuser = MAX(sv->sv_minuser, PAGE_SIZE); 1046878adb85SBjoern A. Zeeb if (vmspace->vm_refcnt == 1 && vm_map_min(map) == sv_minuser && 104705ba50f5SJake Burkholder vm_map_max(map) == sv->sv_maxuser) { 10483db161e0SMatthew Dillon shmexit(vmspace); 1049b9eee07eSPeter Wemm pmap_remove_pages(vmspace_pmap(vmspace)); 105005ba50f5SJake Burkholder vm_map_remove(map, vm_map_min(map), vm_map_max(map)); 1051af9ec885SJohn Dyson } else { 1052878adb85SBjoern A. Zeeb error = vmspace_exec(p, sv_minuser, sv->sv_maxuser); 105389b57fcfSKonstantin Belousov if (error) 105489b57fcfSKonstantin Belousov return (error); 10555e20c11fSAlan Cox vmspace = p->p_vmspace; 105605ba50f5SJake Burkholder map = &vmspace->vm_map; 1057af9ec885SJohn Dyson } 105826f9a767SRodney W. Grimes 10596297a3d8SKonstantin Belousov /* Map a shared page */ 10606297a3d8SKonstantin Belousov obj = sv->sv_shared_page_obj; 10616297a3d8SKonstantin Belousov if (obj != NULL) { 10626297a3d8SKonstantin Belousov vm_object_reference(obj); 10636297a3d8SKonstantin Belousov error = vm_map_fixed(map, obj, 0, 10646297a3d8SKonstantin Belousov sv->sv_shared_page_base, sv->sv_shared_page_len, 10651e65d73cSKonstantin Belousov VM_PROT_READ | VM_PROT_EXECUTE, 10661e65d73cSKonstantin Belousov VM_PROT_READ | VM_PROT_EXECUTE, 10671e65d73cSKonstantin Belousov MAP_INHERIT_SHARE | MAP_ACC_NO_CHARGE); 10686297a3d8SKonstantin Belousov if (error) { 10696297a3d8SKonstantin Belousov vm_object_deallocate(obj); 10706297a3d8SKonstantin Belousov return (error); 10716297a3d8SKonstantin Belousov } 10726297a3d8SKonstantin Belousov } 10736297a3d8SKonstantin Belousov 107426f9a767SRodney W. Grimes /* Allocate a new stack */ 1075316b3843SKonstantin Belousov if (imgp->stack_sz != 0) { 1076fe8a824cSKonstantin Belousov ssiz = trunc_page(imgp->stack_sz); 1077316b3843SKonstantin Belousov PROC_LOCK(p); 1078f6f6d240SMateusz Guzik lim_rlimit_proc(p, RLIMIT_STACK, &rlim_stack); 1079316b3843SKonstantin Belousov PROC_UNLOCK(p); 1080316b3843SKonstantin Belousov if (ssiz > rlim_stack.rlim_max) 1081316b3843SKonstantin Belousov ssiz = rlim_stack.rlim_max; 1082316b3843SKonstantin Belousov if (ssiz > rlim_stack.rlim_cur) { 1083316b3843SKonstantin Belousov rlim_stack.rlim_cur = ssiz; 1084316b3843SKonstantin Belousov kern_setrlimit(curthread, RLIMIT_STACK, &rlim_stack); 1085316b3843SKonstantin Belousov } 1086316b3843SKonstantin Belousov } else if (sv->sv_maxssiz != NULL) { 108759d8f3ffSJohn Baldwin ssiz = *sv->sv_maxssiz; 1088316b3843SKonstantin Belousov } else { 108959d8f3ffSJohn Baldwin ssiz = maxssiz; 1090316b3843SKonstantin Belousov } 109159d8f3ffSJohn Baldwin stack_addr = sv->sv_usrstack - ssiz; 109259d8f3ffSJohn Baldwin error = vm_map_stack(map, stack_addr, (vm_size_t)ssiz, 10936297a3d8SKonstantin Belousov obj != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 10946297a3d8SKonstantin Belousov sv->sv_stackprot, 10956297a3d8SKonstantin Belousov VM_PROT_ALL, MAP_STACK_GROWS_DOWN); 10962267af78SJulian Elischer if (error) 10972267af78SJulian Elischer return (error); 10982267af78SJulian Elischer 109978960940SAlan Cox /* 110078960940SAlan Cox * vm_ssize and vm_maxsaddr are somewhat antiquated concepts, but they 110178960940SAlan Cox * are still used to enforce the stack rlimit on the process stack. 11022267af78SJulian Elischer */ 1103cbc89bfbSPaul Saab vmspace->vm_ssize = sgrowsiz >> PAGE_SHIFT; 11046ef12002SKonstantin Belousov vmspace->vm_maxsaddr = (char *)stack_addr; 110526f9a767SRodney W. Grimes 110626f9a767SRodney W. Grimes return (0); 110726f9a767SRodney W. Grimes } 110826f9a767SRodney W. Grimes 110926f9a767SRodney W. Grimes /* 1110873fbcd7SRobert Watson * Copy out argument and environment strings from the old process address 1111873fbcd7SRobert Watson * space into the temporary string buffer. 111226f9a767SRodney W. Grimes */ 111326f9a767SRodney W. Grimes int 1114610ecfe0SMaxim Sobolev exec_copyin_args(struct image_args *args, char *fname, 1115610ecfe0SMaxim Sobolev enum uio_seg segflg, char **argv, char **envv) 111626f9a767SRodney W. Grimes { 11170a2c94b8SKonstantin Belousov u_long argp, envp; 1118ecbb00a2SDoug Rabson int error; 1119ecbb00a2SDoug Rabson size_t length; 112026f9a767SRodney W. Grimes 1121610ecfe0SMaxim Sobolev bzero(args, sizeof(*args)); 1122610ecfe0SMaxim Sobolev if (argv == NULL) 1123610ecfe0SMaxim Sobolev return (EFAULT); 11242af6e14dSAlan Cox 112526f9a767SRodney W. Grimes /* 11262af6e14dSAlan Cox * Allocate demand-paged memory for the file name, argument, and 11272af6e14dSAlan Cox * environment strings. 112826f9a767SRodney W. Grimes */ 11292af6e14dSAlan Cox error = exec_alloc_args(args); 11302af6e14dSAlan Cox if (error != 0) 11312af6e14dSAlan Cox return (error); 11329e4e5114SAlan Cox 1133610ecfe0SMaxim Sobolev /* 1134610ecfe0SMaxim Sobolev * Copy the file name. 1135610ecfe0SMaxim Sobolev */ 1136632dbc19SKonstantin Belousov if (fname != NULL) { 11372af6e14dSAlan Cox args->fname = args->buf; 1138610ecfe0SMaxim Sobolev error = (segflg == UIO_SYSSPACE) ? 1139610ecfe0SMaxim Sobolev copystr(fname, args->fname, PATH_MAX, &length) : 1140610ecfe0SMaxim Sobolev copyinstr(fname, args->fname, PATH_MAX, &length); 1141c30af532SMaxim Sobolev if (error != 0) 114268ff3c24SStephan Uphoff goto err_exit; 1143632dbc19SKonstantin Belousov } else 11449e4e5114SAlan Cox length = 0; 11459e4e5114SAlan Cox 11462af6e14dSAlan Cox args->begin_argv = args->buf + length; 11479e4e5114SAlan Cox args->endp = args->begin_argv; 11489e4e5114SAlan Cox args->stringspace = ARG_MAX; 114926f9a767SRodney W. Grimes 1150610ecfe0SMaxim Sobolev /* 1151610ecfe0SMaxim Sobolev * extract arguments first 1152610ecfe0SMaxim Sobolev */ 11530a2c94b8SKonstantin Belousov for (;;) { 11540a2c94b8SKonstantin Belousov error = fueword(argv++, &argp); 11550a2c94b8SKonstantin Belousov if (error == -1) { 115668ff3c24SStephan Uphoff error = EFAULT; 115768ff3c24SStephan Uphoff goto err_exit; 115868ff3c24SStephan Uphoff } 11590a2c94b8SKonstantin Belousov if (argp == 0) 11600a2c94b8SKonstantin Belousov break; 11610a2c94b8SKonstantin Belousov error = copyinstr((void *)(uintptr_t)argp, args->endp, 11620a2c94b8SKonstantin Belousov args->stringspace, &length); 11630a2c94b8SKonstantin Belousov if (error != 0) { 1164610ecfe0SMaxim Sobolev if (error == ENAMETOOLONG) 116568ff3c24SStephan Uphoff error = E2BIG; 116668ff3c24SStephan Uphoff goto err_exit; 1167610ecfe0SMaxim Sobolev } 1168610ecfe0SMaxim Sobolev args->stringspace -= length; 1169610ecfe0SMaxim Sobolev args->endp += length; 1170610ecfe0SMaxim Sobolev args->argc++; 1171610ecfe0SMaxim Sobolev } 1172610ecfe0SMaxim Sobolev 1173610ecfe0SMaxim Sobolev args->begin_envv = args->endp; 1174b9df5231SPoul-Henning Kamp 117526f9a767SRodney W. Grimes /* 117626f9a767SRodney W. Grimes * extract environment strings 117726f9a767SRodney W. Grimes */ 11780fd1a014SDavid Greenman if (envv) { 11790a2c94b8SKonstantin Belousov for (;;) { 11800a2c94b8SKonstantin Belousov error = fueword(envv++, &envp); 11810a2c94b8SKonstantin Belousov if (error == -1) { 118268ff3c24SStephan Uphoff error = EFAULT; 118368ff3c24SStephan Uphoff goto err_exit; 118468ff3c24SStephan Uphoff } 11850a2c94b8SKonstantin Belousov if (envp == 0) 11860a2c94b8SKonstantin Belousov break; 11870a2c94b8SKonstantin Belousov error = copyinstr((void *)(uintptr_t)envp, 11880a2c94b8SKonstantin Belousov args->endp, args->stringspace, &length); 11890a2c94b8SKonstantin Belousov if (error != 0) { 11900fd1a014SDavid Greenman if (error == ENAMETOOLONG) 119168ff3c24SStephan Uphoff error = E2BIG; 119268ff3c24SStephan Uphoff goto err_exit; 11930fd1a014SDavid Greenman } 1194610ecfe0SMaxim Sobolev args->stringspace -= length; 1195610ecfe0SMaxim Sobolev args->endp += length; 1196610ecfe0SMaxim Sobolev args->envc++; 119726f9a767SRodney W. Grimes } 11980fd1a014SDavid Greenman } 119926f9a767SRodney W. Grimes 120026f9a767SRodney W. Grimes return (0); 120168ff3c24SStephan Uphoff 120268ff3c24SStephan Uphoff err_exit: 120368ff3c24SStephan Uphoff exec_free_args(args); 120468ff3c24SStephan Uphoff return (error); 120526f9a767SRodney W. Grimes } 120626f9a767SRodney W. Grimes 1207457f7e23SEd Schouten int 1208457f7e23SEd Schouten exec_copyin_data_fds(struct thread *td, struct image_args *args, 1209457f7e23SEd Schouten const void *data, size_t datalen, const int *fds, size_t fdslen) 1210457f7e23SEd Schouten { 1211457f7e23SEd Schouten struct filedesc *ofdp; 1212457f7e23SEd Schouten const char *p; 1213457f7e23SEd Schouten int *kfds; 1214457f7e23SEd Schouten int error; 1215457f7e23SEd Schouten 1216457f7e23SEd Schouten memset(args, '\0', sizeof(*args)); 1217457f7e23SEd Schouten ofdp = td->td_proc->p_fd; 1218457f7e23SEd Schouten if (datalen >= ARG_MAX || fdslen > ofdp->fd_lastfile + 1) 1219457f7e23SEd Schouten return (E2BIG); 1220457f7e23SEd Schouten error = exec_alloc_args(args); 1221457f7e23SEd Schouten if (error != 0) 1222457f7e23SEd Schouten return (error); 1223457f7e23SEd Schouten 1224457f7e23SEd Schouten args->begin_argv = args->buf; 1225457f7e23SEd Schouten args->stringspace = ARG_MAX; 1226457f7e23SEd Schouten 1227457f7e23SEd Schouten if (datalen > 0) { 1228457f7e23SEd Schouten /* 1229457f7e23SEd Schouten * Argument buffer has been provided. Copy it into the 1230457f7e23SEd Schouten * kernel as a single string and add a terminating null 1231457f7e23SEd Schouten * byte. 1232457f7e23SEd Schouten */ 1233457f7e23SEd Schouten error = copyin(data, args->begin_argv, datalen); 1234457f7e23SEd Schouten if (error != 0) 1235457f7e23SEd Schouten goto err_exit; 1236457f7e23SEd Schouten args->begin_argv[datalen] = '\0'; 1237457f7e23SEd Schouten args->endp = args->begin_argv + datalen + 1; 1238457f7e23SEd Schouten args->stringspace -= datalen + 1; 1239457f7e23SEd Schouten 1240457f7e23SEd Schouten /* 1241457f7e23SEd Schouten * Traditional argument counting. Count the number of 1242457f7e23SEd Schouten * null bytes. 1243457f7e23SEd Schouten */ 1244457f7e23SEd Schouten for (p = args->begin_argv; p < args->endp; ++p) 1245457f7e23SEd Schouten if (*p == '\0') 1246457f7e23SEd Schouten ++args->argc; 1247457f7e23SEd Schouten } else { 1248457f7e23SEd Schouten /* No argument buffer provided. */ 1249457f7e23SEd Schouten args->endp = args->begin_argv; 1250457f7e23SEd Schouten } 1251457f7e23SEd Schouten /* There are no environment variables. */ 1252457f7e23SEd Schouten args->begin_envv = args->endp; 1253457f7e23SEd Schouten 1254457f7e23SEd Schouten /* Create new file descriptor table. */ 1255457f7e23SEd Schouten kfds = malloc(fdslen * sizeof(int), M_TEMP, M_WAITOK); 1256457f7e23SEd Schouten error = copyin(fds, kfds, fdslen * sizeof(int)); 1257457f7e23SEd Schouten if (error != 0) { 1258457f7e23SEd Schouten free(kfds, M_TEMP); 1259457f7e23SEd Schouten goto err_exit; 1260457f7e23SEd Schouten } 1261457f7e23SEd Schouten error = fdcopy_remapped(ofdp, kfds, fdslen, &args->fdp); 1262457f7e23SEd Schouten free(kfds, M_TEMP); 1263457f7e23SEd Schouten if (error != 0) 1264457f7e23SEd Schouten goto err_exit; 1265457f7e23SEd Schouten 1266457f7e23SEd Schouten return (0); 1267457f7e23SEd Schouten err_exit: 1268457f7e23SEd Schouten exec_free_args(args); 1269457f7e23SEd Schouten return (error); 1270457f7e23SEd Schouten } 1271457f7e23SEd Schouten 12722af6e14dSAlan Cox /* 12732af6e14dSAlan Cox * Allocate temporary demand-paged, zero-filled memory for the file name, 12742af6e14dSAlan Cox * argument, and environment strings. Returns zero if the allocation succeeds 12752af6e14dSAlan Cox * and ENOMEM otherwise. 12762af6e14dSAlan Cox */ 12772af6e14dSAlan Cox int 12782af6e14dSAlan Cox exec_alloc_args(struct image_args *args) 12792af6e14dSAlan Cox { 12802af6e14dSAlan Cox 12815df87b21SJeff Roberson args->buf = (char *)kmap_alloc_wait(exec_map, PATH_MAX + ARG_MAX); 12822af6e14dSAlan Cox return (args->buf != NULL ? 0 : ENOMEM); 12832af6e14dSAlan Cox } 12842af6e14dSAlan Cox 128569a8f9e3SAlan Cox void 1286610ecfe0SMaxim Sobolev exec_free_args(struct image_args *args) 1287610ecfe0SMaxim Sobolev { 1288610ecfe0SMaxim Sobolev 128969a8f9e3SAlan Cox if (args->buf != NULL) { 12905df87b21SJeff Roberson kmap_free_wakeup(exec_map, (vm_offset_t)args->buf, 12912af6e14dSAlan Cox PATH_MAX + ARG_MAX); 1292610ecfe0SMaxim Sobolev args->buf = NULL; 1293610ecfe0SMaxim Sobolev } 1294a14a9498SAlan Cox if (args->fname_buf != NULL) { 1295a14a9498SAlan Cox free(args->fname_buf, M_TEMP); 1296a14a9498SAlan Cox args->fname_buf = NULL; 1297a14a9498SAlan Cox } 1298457f7e23SEd Schouten if (args->fdp != NULL) 1299457f7e23SEd Schouten fdescfree_remapped(args->fdp); 1300610ecfe0SMaxim Sobolev } 1301610ecfe0SMaxim Sobolev 130226f9a767SRodney W. Grimes /* 1303873fbcd7SRobert Watson * Copy strings out to the new process address space, constructing new arg 1304873fbcd7SRobert Watson * and env vector tables. Return a pointer to the base so that it can be used 1305873fbcd7SRobert Watson * as the initial stack pointer. 130626f9a767SRodney W. Grimes */ 1307654f6be1SBruce Evans register_t * 1308c52007c2SDavid Greenman exec_copyout_strings(imgp) 1309c52007c2SDavid Greenman struct image_params *imgp; 131026f9a767SRodney W. Grimes { 131126f9a767SRodney W. Grimes int argc, envc; 131226f9a767SRodney W. Grimes char **vectp; 131388b124ceSKonstantin Belousov char *stringp; 131488b124ceSKonstantin Belousov uintptr_t destp; 1315654f6be1SBruce Evans register_t *stack_base; 131693f6448cSDavid Greenman struct ps_strings *arginfo; 1317f3bec5d7SJake Burkholder struct proc *p; 13183ff06357SKonstantin Belousov size_t execpath_len; 1319ee235befSKonstantin Belousov int szsigcode, szps; 1320ee235befSKonstantin Belousov char canary[sizeof(long) * 8]; 132126f9a767SRodney W. Grimes 1322ee235befSKonstantin Belousov szps = sizeof(pagesizes[0]) * MAXPAGESIZES; 132326f9a767SRodney W. Grimes /* 132426f9a767SRodney W. Grimes * Calculate string base and vector table pointers. 1325d66a5066SPeter Wemm * Also deal with signal trampoline code for this exec type. 132626f9a767SRodney W. Grimes */ 13273ff06357SKonstantin Belousov if (imgp->execpath != NULL && imgp->auxargs != NULL) 13283ff06357SKonstantin Belousov execpath_len = strlen(imgp->execpath) + 1; 13293ff06357SKonstantin Belousov else 13303ff06357SKonstantin Belousov execpath_len = 0; 1331f3bec5d7SJake Burkholder p = imgp->proc; 1332f3bec5d7SJake Burkholder szsigcode = 0; 133305ba50f5SJake Burkholder arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 13346297a3d8SKonstantin Belousov if (p->p_sysent->sv_sigcode_base == 0) { 1335f3bec5d7SJake Burkholder if (p->p_sysent->sv_szsigcode != NULL) 1336f3bec5d7SJake Burkholder szsigcode = *(p->p_sysent->sv_szsigcode); 13376297a3d8SKonstantin Belousov } 133888b124ceSKonstantin Belousov destp = (uintptr_t)arginfo; 13391ed012f9SPeter Wemm 134026f9a767SRodney W. Grimes /* 1341d66a5066SPeter Wemm * install sigcode 1342d66a5066SPeter Wemm */ 134388b124ceSKonstantin Belousov if (szsigcode != 0) { 134488b124ceSKonstantin Belousov destp -= szsigcode; 134588b124ceSKonstantin Belousov destp = rounddown2(destp, sizeof(void *)); 134688b124ceSKonstantin Belousov copyout(p->p_sysent->sv_sigcode, (void *)destp, szsigcode); 134788b124ceSKonstantin Belousov } 1348d66a5066SPeter Wemm 1349d66a5066SPeter Wemm /* 13503ff06357SKonstantin Belousov * Copy the image path for the rtld. 13513ff06357SKonstantin Belousov */ 13523ff06357SKonstantin Belousov if (execpath_len != 0) { 135388b124ceSKonstantin Belousov destp -= execpath_len; 135488b124ceSKonstantin Belousov imgp->execpathp = destp; 135588b124ceSKonstantin Belousov copyout(imgp->execpath, (void *)destp, execpath_len); 13563ff06357SKonstantin Belousov } 13573ff06357SKonstantin Belousov 13583ff06357SKonstantin Belousov /* 1359ee235befSKonstantin Belousov * Prepare the canary for SSP. 1360ee235befSKonstantin Belousov */ 1361ee235befSKonstantin Belousov arc4rand(canary, sizeof(canary), 0); 136288b124ceSKonstantin Belousov destp -= sizeof(canary); 136388b124ceSKonstantin Belousov imgp->canary = destp; 136488b124ceSKonstantin Belousov copyout(canary, (void *)destp, sizeof(canary)); 1365ee235befSKonstantin Belousov imgp->canarylen = sizeof(canary); 1366ee235befSKonstantin Belousov 1367ee235befSKonstantin Belousov /* 1368ee235befSKonstantin Belousov * Prepare the pagesizes array. 1369ee235befSKonstantin Belousov */ 137088b124ceSKonstantin Belousov destp -= szps; 137188b124ceSKonstantin Belousov destp = rounddown2(destp, sizeof(void *)); 137288b124ceSKonstantin Belousov imgp->pagesizes = destp; 137388b124ceSKonstantin Belousov copyout(pagesizes, (void *)destp, szps); 1374ee235befSKonstantin Belousov imgp->pagesizeslen = szps; 1375ee235befSKonstantin Belousov 137688b124ceSKonstantin Belousov destp -= ARG_MAX - imgp->args->stringspace; 137788b124ceSKonstantin Belousov destp = rounddown2(destp, sizeof(void *)); 137888b124ceSKonstantin Belousov 1379ee235befSKonstantin Belousov /* 1380e1743d02SSøren Schmidt * If we have a valid auxargs ptr, prepare some room 1381e1743d02SSøren Schmidt * on the stack. 1382e1743d02SSøren Schmidt */ 1383b9a22da4STakanori Watanabe if (imgp->auxargs) { 1384e1743d02SSøren Schmidt /* 1385b9a22da4STakanori Watanabe * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 1386b9a22da4STakanori Watanabe * lower compatibility. 1387b9a22da4STakanori Watanabe */ 1388ca0387efSJake Burkholder imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : 1389ca0387efSJake Burkholder (AT_COUNT * 2); 1390b9a22da4STakanori Watanabe /* 1391b9a22da4STakanori Watanabe * The '+ 2' is for the null pointers at the end of each of 1392b9a22da4STakanori Watanabe * the arg and env vector sets,and imgp->auxarg_size is room 1393b9a22da4STakanori Watanabe * for argument of Runtime loader. 1394e1743d02SSøren Schmidt */ 1395610ecfe0SMaxim Sobolev vectp = (char **)(destp - (imgp->args->argc + 1396ee235befSKonstantin Belousov imgp->args->envc + 2 + imgp->auxarg_size) 1397ee235befSKonstantin Belousov * sizeof(char *)); 1398610ecfe0SMaxim Sobolev } else { 1399e1743d02SSøren Schmidt /* 1400b9a22da4STakanori Watanabe * The '+ 2' is for the null pointers at the end of each of 1401b9a22da4STakanori Watanabe * the arg and env vector sets 140226f9a767SRodney W. Grimes */ 140388b124ceSKonstantin Belousov vectp = (char **)(destp - (imgp->args->argc + imgp->args->envc 140488b124ceSKonstantin Belousov + 2) * sizeof(char *)); 1405610ecfe0SMaxim Sobolev } 140626f9a767SRodney W. Grimes 140726f9a767SRodney W. Grimes /* 140826f9a767SRodney W. Grimes * vectp also becomes our initial stack base 140926f9a767SRodney W. Grimes */ 1410654f6be1SBruce Evans stack_base = (register_t *)vectp; 141126f9a767SRodney W. Grimes 1412610ecfe0SMaxim Sobolev stringp = imgp->args->begin_argv; 1413610ecfe0SMaxim Sobolev argc = imgp->args->argc; 1414610ecfe0SMaxim Sobolev envc = imgp->args->envc; 141526f9a767SRodney W. Grimes 141693f6448cSDavid Greenman /* 14173aed948bSDavid Greenman * Copy out strings - arguments and environment. 141893f6448cSDavid Greenman */ 141988b124ceSKonstantin Belousov copyout(stringp, (void *)destp, ARG_MAX - imgp->args->stringspace); 142093f6448cSDavid Greenman 142193f6448cSDavid Greenman /* 14223aed948bSDavid Greenman * Fill in "ps_strings" struct for ps, w, etc. 14233aed948bSDavid Greenman */ 1424aae0aa45SBruce Evans suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp); 1425f4e26adeSNathan Whitehorn suword32(&arginfo->ps_nargvstr, argc); 14263aed948bSDavid Greenman 14273aed948bSDavid Greenman /* 14283aed948bSDavid Greenman * Fill in argument portion of vector table. 142993f6448cSDavid Greenman */ 143026f9a767SRodney W. Grimes for (; argc > 0; --argc) { 1431aae0aa45SBruce Evans suword(vectp++, (long)(intptr_t)destp); 14323aed948bSDavid Greenman while (*stringp++ != 0) 14333aed948bSDavid Greenman destp++; 14343aed948bSDavid Greenman destp++; 143526f9a767SRodney W. Grimes } 143626f9a767SRodney W. Grimes 14371a6e52d0SJeroen Ruigrok van der Werven /* a null vector table pointer separates the argp's from the envp's */ 14386ab46d52SBruce Evans suword(vectp++, 0); 143926f9a767SRodney W. Grimes 1440aae0aa45SBruce Evans suword(&arginfo->ps_envstr, (long)(intptr_t)vectp); 1441f4e26adeSNathan Whitehorn suword32(&arginfo->ps_nenvstr, envc); 144293f6448cSDavid Greenman 144393f6448cSDavid Greenman /* 14443aed948bSDavid Greenman * Fill in environment portion of vector table. 144593f6448cSDavid Greenman */ 144626f9a767SRodney W. Grimes for (; envc > 0; --envc) { 1447aae0aa45SBruce Evans suword(vectp++, (long)(intptr_t)destp); 14483aed948bSDavid Greenman while (*stringp++ != 0) 14493aed948bSDavid Greenman destp++; 14503aed948bSDavid Greenman destp++; 145126f9a767SRodney W. Grimes } 145226f9a767SRodney W. Grimes 145326f9a767SRodney W. Grimes /* end of vector table is a null pointer */ 14546ab46d52SBruce Evans suword(vectp, 0); 145526f9a767SRodney W. Grimes 145626f9a767SRodney W. Grimes return (stack_base); 145726f9a767SRodney W. Grimes } 145826f9a767SRodney W. Grimes 145926f9a767SRodney W. Grimes /* 146026f9a767SRodney W. Grimes * Check permissions of file to execute. 1461cf64863aSRobert Watson * Called with imgp->vp locked. 146226f9a767SRodney W. Grimes * Return 0 for success or error code on failure. 146326f9a767SRodney W. Grimes */ 1464c8a79999SPeter Wemm int 1465c52007c2SDavid Greenman exec_check_permissions(imgp) 1466c52007c2SDavid Greenman struct image_params *imgp; 146726f9a767SRodney W. Grimes { 1468c52007c2SDavid Greenman struct vnode *vp = imgp->vp; 1469c52007c2SDavid Greenman struct vattr *attr = imgp->attr; 1470a854ed98SJohn Baldwin struct thread *td; 1471140dedb8SKonstantin Belousov int error, writecount; 147226f9a767SRodney W. Grimes 14736617724cSJeff Roberson td = curthread; 1474339b79b9SRobert Watson 1475ec35c2afSRobert Watson /* Get file attributes */ 14760359a12eSAttilio Rao error = VOP_GETATTR(vp, attr, td->td_ucred); 1477ec35c2afSRobert Watson if (error) 1478ec35c2afSRobert Watson return (error); 1479ec35c2afSRobert Watson 1480339b79b9SRobert Watson #ifdef MAC 148130d239bcSRobert Watson error = mac_vnode_check_exec(td->td_ucred, imgp->vp, imgp); 1482339b79b9SRobert Watson if (error) 1483339b79b9SRobert Watson return (error); 1484339b79b9SRobert Watson #endif 1485339b79b9SRobert Watson 148626f9a767SRodney W. Grimes /* 1487de478dd4SJaakko Heinonen * 1) Check if file execution is disabled for the filesystem that 1488de478dd4SJaakko Heinonen * this file resides on. 1489de478dd4SJaakko Heinonen * 2) Ensure that at least one execute bit is on. Otherwise, a 1490de478dd4SJaakko Heinonen * privileged user will always succeed, and we don't want this 1491de478dd4SJaakko Heinonen * to happen unless the file really is executable. 1492de478dd4SJaakko Heinonen * 3) Ensure that the file is a regular file. 149326f9a767SRodney W. Grimes */ 1494c52007c2SDavid Greenman if ((vp->v_mount->mnt_flag & MNT_NOEXEC) || 1495de478dd4SJaakko Heinonen (attr->va_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0 || 1496a854ed98SJohn Baldwin (attr->va_type != VREG)) 149726f9a767SRodney W. Grimes return (EACCES); 149826f9a767SRodney W. Grimes 149926f9a767SRodney W. Grimes /* 150026f9a767SRodney W. Grimes * Zero length files can't be exec'd 150126f9a767SRodney W. Grimes */ 150226f9a767SRodney W. Grimes if (attr->va_size == 0) 150326f9a767SRodney W. Grimes return (ENOEXEC); 150426f9a767SRodney W. Grimes 150526f9a767SRodney W. Grimes /* 150626f9a767SRodney W. Grimes * Check for execute permission to file based on current credentials. 150726f9a767SRodney W. Grimes */ 1508a854ed98SJohn Baldwin error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td); 150926f9a767SRodney W. Grimes if (error) 151026f9a767SRodney W. Grimes return (error); 151126f9a767SRodney W. Grimes 15126d5a0a8cSDavid Greenman /* 15136d5a0a8cSDavid Greenman * Check number of open-for-writes on the file and deny execution 15146d5a0a8cSDavid Greenman * if there are any. 15156d5a0a8cSDavid Greenman */ 1516140dedb8SKonstantin Belousov error = VOP_GET_WRITECOUNT(vp, &writecount); 1517140dedb8SKonstantin Belousov if (error != 0) 1518140dedb8SKonstantin Belousov return (error); 1519140dedb8SKonstantin Belousov if (writecount != 0) 15206d5a0a8cSDavid Greenman return (ETXTBSY); 15216d5a0a8cSDavid Greenman 15226d5a0a8cSDavid Greenman /* 15236d5a0a8cSDavid Greenman * Call filesystem specific open routine (which does nothing in the 15246d5a0a8cSDavid Greenman * general case). 15256d5a0a8cSDavid Greenman */ 15269e223287SKonstantin Belousov error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL); 15279a75ea23SKonstantin Belousov if (error == 0) 15289a75ea23SKonstantin Belousov imgp->opened = 1; 152926f9a767SRodney W. Grimes return (error); 1530df8bae1dSRodney W. Grimes } 1531aa855a59SPeter Wemm 1532aa855a59SPeter Wemm /* 1533aa855a59SPeter Wemm * Exec handler registration 1534aa855a59SPeter Wemm */ 1535aa855a59SPeter Wemm int 1536aa855a59SPeter Wemm exec_register(execsw_arg) 1537aa855a59SPeter Wemm const struct execsw *execsw_arg; 1538aa855a59SPeter Wemm { 1539aa855a59SPeter Wemm const struct execsw **es, **xs, **newexecsw; 1540aa855a59SPeter Wemm int count = 2; /* New slot and trailing NULL */ 1541aa855a59SPeter Wemm 1542aa855a59SPeter Wemm if (execsw) 1543aa855a59SPeter Wemm for (es = execsw; *es; es++) 1544aa855a59SPeter Wemm count++; 1545a163d034SWarner Losh newexecsw = malloc(count * sizeof(*es), M_TEMP, M_WAITOK); 1546aa855a59SPeter Wemm if (newexecsw == NULL) 1547a7cddfedSJake Burkholder return (ENOMEM); 1548aa855a59SPeter Wemm xs = newexecsw; 1549aa855a59SPeter Wemm if (execsw) 1550aa855a59SPeter Wemm for (es = execsw; *es; es++) 1551aa855a59SPeter Wemm *xs++ = *es; 1552aa855a59SPeter Wemm *xs++ = execsw_arg; 1553aa855a59SPeter Wemm *xs = NULL; 1554aa855a59SPeter Wemm if (execsw) 1555aa855a59SPeter Wemm free(execsw, M_TEMP); 1556aa855a59SPeter Wemm execsw = newexecsw; 1557a7cddfedSJake Burkholder return (0); 1558aa855a59SPeter Wemm } 1559aa855a59SPeter Wemm 1560aa855a59SPeter Wemm int 1561aa855a59SPeter Wemm exec_unregister(execsw_arg) 1562aa855a59SPeter Wemm const struct execsw *execsw_arg; 1563aa855a59SPeter Wemm { 1564aa855a59SPeter Wemm const struct execsw **es, **xs, **newexecsw; 1565aa855a59SPeter Wemm int count = 1; 1566aa855a59SPeter Wemm 1567aa855a59SPeter Wemm if (execsw == NULL) 1568aa855a59SPeter Wemm panic("unregister with no handlers left?\n"); 1569aa855a59SPeter Wemm 1570aa855a59SPeter Wemm for (es = execsw; *es; es++) { 1571aa855a59SPeter Wemm if (*es == execsw_arg) 1572aa855a59SPeter Wemm break; 1573aa855a59SPeter Wemm } 1574aa855a59SPeter Wemm if (*es == NULL) 1575a7cddfedSJake Burkholder return (ENOENT); 1576aa855a59SPeter Wemm for (es = execsw; *es; es++) 1577aa855a59SPeter Wemm if (*es != execsw_arg) 1578aa855a59SPeter Wemm count++; 1579a163d034SWarner Losh newexecsw = malloc(count * sizeof(*es), M_TEMP, M_WAITOK); 1580aa855a59SPeter Wemm if (newexecsw == NULL) 1581a7cddfedSJake Burkholder return (ENOMEM); 1582aa855a59SPeter Wemm xs = newexecsw; 1583aa855a59SPeter Wemm for (es = execsw; *es; es++) 1584aa855a59SPeter Wemm if (*es != execsw_arg) 1585aa855a59SPeter Wemm *xs++ = *es; 1586aa855a59SPeter Wemm *xs = NULL; 1587aa855a59SPeter Wemm if (execsw) 1588aa855a59SPeter Wemm free(execsw, M_TEMP); 1589aa855a59SPeter Wemm execsw = newexecsw; 1590a7cddfedSJake Burkholder return (0); 1591aa855a59SPeter Wemm } 1592