netbsd32_execve.c revision 1.2.2.7
1 /* $NetBSD: netbsd32_execve.c,v 1.2.2.7 2002/06/20 03:43:08 nathanw Exp $ */ 2 3 /* 4 * Copyright (c) 1998, 2001 Matthew R. Green 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: netbsd32_execve.c,v 1.2.2.7 2002/06/20 03:43:08 nathanw Exp $"); 33 34 #if defined(_KERNEL_OPT) 35 #include "opt_ktrace.h" 36 #endif 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/malloc.h> 41 #include <sys/mount.h> 42 #include <sys/stat.h> 43 #include <sys/wait.h> 44 #include <sys/ktrace.h> 45 #include <sys/vnode.h> 46 #include <sys/file.h> 47 #include <sys/filedesc.h> 48 #include <sys/namei.h> 49 50 #include <uvm/uvm_extern.h> 51 52 #include <sys/sa.h> 53 #include <sys/syscallargs.h> 54 #include <sys/proc.h> 55 #include <sys/acct.h> 56 #include <sys/exec.h> 57 58 #include <compat/netbsd32/netbsd32.h> 59 #include <compat/netbsd32/netbsd32_syscall.h> 60 #include <compat/netbsd32/netbsd32_syscallargs.h> 61 62 /* this is provided by kern/kern_exec.c */ 63 extern int exec_maxhdrsz; 64 #if defined(LKM) || defined(_LKM) 65 extern struct lock exec_lock; 66 #endif 67 68 /* 69 * Need to completly reimplement this syscall due to argument copying. 70 */ 71 /* ARGSUSED */ 72 int 73 netbsd32_execve(p, v, retval) 74 struct proc *p; 75 void *v; 76 register_t *retval; 77 { 78 struct netbsd32_execve_args /* { 79 syscallarg(const netbsd32_charp) path; 80 syscallarg(netbsd32_charpp) argp; 81 syscallarg(netbsd32_charpp) envp; 82 } */ *uap = v; 83 struct sys_execve_args ua; 84 caddr_t sg; 85 86 NETBSD32TOP_UAP(path, const char); 87 NETBSD32TOP_UAP(argp, char *); 88 NETBSD32TOP_UAP(envp, char *); 89 sg = stackgap_init(p, 0); 90 CHECK_ALT_EXIST(p, &sg, SCARG(&ua, path)); 91 92 return netbsd32_execve2(p, &ua, retval); 93 } 94 95 int 96 netbsd32_execve2(p, uap, retval) 97 struct proc *p; 98 struct sys_execve_args *uap; 99 register_t *retval; 100 { 101 /* Function args */ 102 int error, i; 103 struct exec_package pack; 104 struct nameidata nid; 105 struct vattr attr; 106 struct ucred *cred = p->p_ucred; 107 char *argp; 108 netbsd32_charp const *cpp; 109 char *dp; 110 netbsd32_charp sp; 111 long argc, envc; 112 size_t len; 113 char *stack; 114 struct ps_strings arginfo; 115 struct vmspace *vm; 116 char **tmpfap; 117 int szsigcode; 118 struct exec_vmcmd *base_vcp = NULL; 119 120 /* 121 * Init the namei data to point the file user's program name. 122 * This is done here rather than in check_exec(), so that it's 123 * possible to override this settings if any of makecmd/probe 124 * functions call check_exec() recursively - for example, 125 * see exec_script_makecmds(). 126 */ 127 NDINIT(&nid, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 128 129 /* 130 * initialize the fields of the exec package. 131 */ 132 pack.ep_name = SCARG(uap, path); 133 pack.ep_hdr = malloc(exec_maxhdrsz, M_EXEC, M_WAITOK); 134 pack.ep_hdrlen = exec_maxhdrsz; 135 pack.ep_hdrvalid = 0; 136 pack.ep_ndp = &nid; 137 pack.ep_emul_arg = NULL; 138 pack.ep_vmcmds.evs_cnt = 0; 139 pack.ep_vmcmds.evs_used = 0; 140 pack.ep_vap = &attr; 141 pack.ep_flags = 0; 142 143 #if defined(LKM) || defined(_LKM) 144 lockmgr(&exec_lock, LK_SHARED, NULL); 145 #endif 146 147 /* see if we can run it. */ 148 if ((error = check_exec(p, &pack)) != 0) 149 goto freehdr; 150 151 /* XXX -- THE FOLLOWING SECTION NEEDS MAJOR CLEANUP */ 152 153 /* allocate an argument buffer */ 154 argp = (char *) uvm_km_valloc_wait(exec_map, NCARGS); 155 #ifdef DIAGNOSTIC 156 if (argp == (vaddr_t) 0) 157 panic("netbsd32_execve: argp == NULL"); 158 #endif 159 dp = argp; 160 argc = 0; 161 162 /* copy the fake args list, if there's one, freeing it as we go */ 163 if (pack.ep_flags & EXEC_HASARGL) { 164 tmpfap = pack.ep_fa; 165 while (*tmpfap != NULL) { 166 char *cp; 167 168 cp = *tmpfap; 169 while (*cp) 170 *dp++ = *cp++; 171 dp++; 172 173 FREE(*tmpfap, M_EXEC); 174 tmpfap++; argc++; 175 } 176 FREE(pack.ep_fa, M_EXEC); 177 pack.ep_flags &= ~EXEC_HASARGL; 178 } 179 180 /* Now get argv & environment */ 181 if (!(cpp = (netbsd32_charp *)SCARG(uap, argp))) { 182 error = EINVAL; 183 goto bad; 184 } 185 186 if (pack.ep_flags & EXEC_SKIPARG) 187 cpp++; 188 189 while (1) { 190 len = argp + ARG_MAX - dp; 191 if ((error = copyin(cpp, &sp, sizeof(sp))) != 0) 192 goto bad; 193 if (!sp) 194 break; 195 if ((error = copyinstr((char *)(u_long)sp, dp, 196 len, &len)) != 0) { 197 if (error == ENAMETOOLONG) 198 error = E2BIG; 199 goto bad; 200 } 201 dp += len; 202 cpp++; 203 argc++; 204 } 205 206 envc = 0; 207 /* environment need not be there */ 208 if ((cpp = (netbsd32_charp *)SCARG(uap, envp)) != NULL ) { 209 while (1) { 210 len = argp + ARG_MAX - dp; 211 if ((error = copyin(cpp, &sp, sizeof(sp))) != 0) 212 goto bad; 213 if (!sp) 214 break; 215 if ((error = copyinstr((char *)(u_long)sp, 216 dp, len, &len)) != 0) { 217 if (error == ENAMETOOLONG) 218 error = E2BIG; 219 goto bad; 220 } 221 dp += len; 222 cpp++; 223 envc++; 224 } 225 } 226 227 dp = (char *) ALIGN(dp); 228 229 szsigcode = pack.ep_es->es_emul->e_esigcode - 230 pack.ep_es->es_emul->e_sigcode; 231 232 /* Now check if args & environ fit into new stack */ 233 if (pack.ep_flags & EXEC_32) 234 len = ((argc + envc + 2 + pack.ep_es->es_arglen) * 235 sizeof(int) + sizeof(int) + dp + STACKGAPLEN + 236 szsigcode + sizeof(struct ps_strings)) - argp; 237 else 238 len = ((argc + envc + 2 + pack.ep_es->es_arglen) * 239 sizeof(char *) + sizeof(int) + dp + STACKGAPLEN + 240 szsigcode + sizeof(struct ps_strings)) - argp; 241 242 len = ALIGN(len); /* make the stack "safely" aligned */ 243 244 if (len > pack.ep_ssize) { /* in effect, compare to initial limit */ 245 error = ENOMEM; 246 goto bad; 247 } 248 249 /* adjust "active stack depth" for process VSZ */ 250 pack.ep_ssize = len; /* maybe should go elsewhere, but... */ 251 252 /* 253 * Do whatever is necessary to prepare the address space 254 * for remapping. Note that this might replace the current 255 * vmspace with another! 256 */ 257 uvmspace_exec(p, VM_MIN_ADDRESS, (vaddr_t)pack.ep_minsaddr); 258 259 /* Now map address space */ 260 vm = p->p_vmspace; 261 vm->vm_taddr = (char *) pack.ep_taddr; 262 vm->vm_tsize = btoc(pack.ep_tsize); 263 vm->vm_daddr = (char *) pack.ep_daddr; 264 vm->vm_dsize = btoc(pack.ep_dsize); 265 vm->vm_ssize = btoc(pack.ep_ssize); 266 vm->vm_maxsaddr = (char *) pack.ep_maxsaddr; 267 vm->vm_minsaddr = (char *) pack.ep_minsaddr; 268 269 /* create the new process's VM space by running the vmcmds */ 270 #ifdef DIAGNOSTIC 271 if (pack.ep_vmcmds.evs_used == 0) 272 panic("netbsd32_execve: no vmcmds"); 273 #endif 274 for (i = 0; i < pack.ep_vmcmds.evs_used && !error; i++) { 275 struct exec_vmcmd *vcp; 276 277 vcp = &pack.ep_vmcmds.evs_cmds[i]; 278 if (vcp->ev_flags & VMCMD_RELATIVE) { 279 #ifdef DIAGNOSTIC 280 if (base_vcp == NULL) 281 panic("netbsd32_execve: relative vmcmd with no base"); 282 if (vcp->ev_flags & VMCMD_BASE) 283 panic("netbsd32_execve: illegal base & relative vmcmd"); 284 #endif 285 vcp->ev_addr += base_vcp->ev_addr; 286 } 287 error = (*vcp->ev_proc)(p, vcp); 288 #ifdef DEBUG 289 if (error) { 290 int j; 291 292 for (j = 0; j <= i; j++) 293 printf("vmcmd[%d] = %#lx/%#lx @ %#lx\n", j, 294 vcp[j-i].ev_addr, vcp[j-i].ev_len, 295 vcp[j-i].ev_offset); 296 } 297 #endif 298 if (vcp->ev_flags & VMCMD_BASE) 299 base_vcp = vcp; 300 } 301 302 /* free the vmspace-creation commands, and release their references */ 303 kill_vmcmds(&pack.ep_vmcmds); 304 305 /* if an error happened, deallocate and punt */ 306 if (error) { 307 #ifdef DEBUG 308 printf("netbsd32_execve: vmcmd %i failed: %d\n", i-1, error); 309 #endif 310 goto exec_abort; 311 } 312 313 /* remember information about the process */ 314 arginfo.ps_nargvstr = argc; 315 arginfo.ps_nenvstr = envc; 316 317 stack = (char *) (vm->vm_minsaddr - len); 318 /* Now copy argc, args & environ to new stack */ 319 error = (*pack.ep_es->es_copyargs)(&pack, &arginfo, 320 &stack, argp); 321 if (error) { 322 #ifdef DEBUG 323 printf("netbsd32_execve: copyargs failed\n"); 324 #endif 325 goto exec_abort; 326 } 327 /* restore the stack back to its original point */ 328 stack = (char *) (vm->vm_minsaddr - len); 329 330 /* fill process ps_strings info */ 331 p->p_psstr = (struct ps_strings *)(vm->vm_minsaddr - 332 sizeof(struct ps_strings)); 333 p->p_psargv = offsetof(struct ps_strings, ps_argvstr); 334 p->p_psnargv = offsetof(struct ps_strings, ps_nargvstr); 335 p->p_psenv = offsetof(struct ps_strings, ps_envstr); 336 p->p_psnenv = offsetof(struct ps_strings, ps_nenvstr); 337 338 /* copy out the process's ps_strings structure */ 339 if (copyout(&arginfo, (char *)p->p_psstr, sizeof(arginfo))) { 340 #ifdef DEBUG 341 printf("netbsd32_execve: ps_strings copyout failed\n"); 342 #endif 343 goto exec_abort; 344 } 345 346 /* copy out the process's signal trapoline code */ 347 if (szsigcode) { 348 if (copyout((char *)pack.ep_es->es_emul->e_sigcode, 349 p->p_sigctx.ps_sigcode = (char *)p->p_psstr - szsigcode, 350 szsigcode)) { 351 #ifdef DEBUG 352 printf("netbsd32_execve: sig trampoline copyout failed\n"); 353 #endif 354 goto exec_abort; 355 } 356 #ifdef PMAP_NEED_PROCWR 357 /* This is code. Let the pmap do what is needed. */ 358 pmap_procwr(p, (vaddr_t)p->p_sigacts->ps_sigcode, szsigcode); 359 #endif 360 } 361 362 stopprofclock(p); /* stop profiling */ 363 fdcloseexec(p); /* handle close on exec */ 364 execsigs(p); /* reset catched signals */ 365 p->p_ctxlink = NULL; /* reset ucontext link */ 366 367 /* set command name & other accounting info */ 368 len = min(nid.ni_cnd.cn_namelen, MAXCOMLEN); 369 memcpy(p->p_comm, nid.ni_cnd.cn_nameptr, len); 370 p->p_comm[len] = 0; 371 p->p_acflag &= ~AFORK; 372 373 /* record proc's vnode, for use by procfs and others */ 374 if (p->p_textvp) 375 vrele(p->p_textvp); 376 VREF(pack.ep_vp); 377 p->p_textvp = pack.ep_vp; 378 379 p->p_flag |= P_EXEC; 380 if (p->p_flag & P_PPWAIT) { 381 p->p_flag &= ~P_PPWAIT; 382 wakeup((caddr_t) p->p_pptr); 383 } 384 385 /* 386 * deal with set[ug]id. 387 * MNT_NOSUID has already been used to disable s[ug]id. 388 */ 389 if ((p->p_flag & P_TRACED) == 0 && 390 391 (((attr.va_mode & S_ISUID) != 0 && 392 p->p_ucred->cr_uid != attr.va_uid) || 393 394 ((attr.va_mode & S_ISGID) != 0 && 395 p->p_ucred->cr_gid != attr.va_gid))) { 396 /* 397 * Mark the process as SUGID before we do 398 * anything that might block. 399 */ 400 p_sugid(p); 401 402 p->p_ucred = crcopy(cred); 403 #ifdef KTRACE 404 /* 405 * If process is being ktraced, turn off - unless 406 * root set it. 407 */ 408 if (p->p_tracep && !(p->p_traceflag & KTRFAC_ROOT)) 409 ktrderef(p); 410 #endif 411 if (attr.va_mode & S_ISUID) 412 p->p_ucred->cr_uid = attr.va_uid; 413 if (attr.va_mode & S_ISGID) 414 p->p_ucred->cr_gid = attr.va_gid; 415 } else 416 p->p_flag &= ~P_SUGID; 417 p->p_cred->p_svuid = p->p_ucred->cr_uid; 418 p->p_cred->p_svgid = p->p_ucred->cr_gid; 419 420 doexechooks(p); 421 422 uvm_km_free_wakeup(exec_map, (vaddr_t) argp, NCARGS); 423 424 PNBUF_PUT(nid.ni_cnd.cn_pnbuf); 425 vn_lock(pack.ep_vp, LK_EXCLUSIVE | LK_RETRY); 426 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 427 vput(pack.ep_vp); 428 429 /* setup new registers and do misc. setup. */ 430 (*pack.ep_es->es_emul->e_setregs)(p, &pack, (u_long) stack); 431 if (pack.ep_es->es_setregs) 432 (*pack.ep_es->es_setregs)(p, &pack, (u_long) stack); 433 434 if (p->p_flag & P_TRACED) 435 psignal(p, SIGTRAP); 436 437 free(pack.ep_hdr, M_EXEC); 438 439 /* 440 * Call emulation specific exec hook. This can setup setup per-process 441 * p->p_emuldata or do any other per-process stuff an emulation needs. 442 * 443 * If we are executing process of different emulation than the 444 * original forked process, call e_proc_exit() of the old emulation 445 * first, then e_proc_exec() of new emulation. If the emulation is 446 * same, the exec hook code should deallocate any old emulation 447 * resources held previously by this process. 448 */ 449 if (p->p_emul && p->p_emul->e_proc_exit 450 && p->p_emul != pack.ep_es->es_emul) 451 (*p->p_emul->e_proc_exit)(p); 452 453 /* 454 * Call exec hook. Emulation code may NOT store reference to anything 455 * from &pack. 456 */ 457 if (pack.ep_es->es_emul->e_proc_exec) 458 (*pack.ep_es->es_emul->e_proc_exec)(p, &pack); 459 460 /* update p_emul, the old value is no longer needed */ 461 p->p_emul = pack.ep_es->es_emul; 462 463 #ifdef KTRACE 464 if (KTRPOINT(p, KTR_EMUL)) 465 ktremul(p); 466 #endif 467 468 #if defined(LKM) || defined(_LKM) 469 lockmgr(&exec_lock, LK_RELEASE, NULL); 470 #endif 471 472 return (EJUSTRETURN); 473 474 bad: 475 /* free the vmspace-creation commands, and release their references */ 476 kill_vmcmds(&pack.ep_vmcmds); 477 /* kill any opened file descriptor, if necessary */ 478 if (pack.ep_flags & EXEC_HASFD) { 479 pack.ep_flags &= ~EXEC_HASFD; 480 (void) fdrelease(p, pack.ep_fd); 481 } 482 /* close and put the exec'd file */ 483 vn_lock(pack.ep_vp, LK_EXCLUSIVE | LK_RETRY); 484 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 485 vput(pack.ep_vp); 486 PNBUF_PUT(nid.ni_cnd.cn_pnbuf); 487 uvm_km_free_wakeup(exec_map, (vaddr_t) argp, NCARGS); 488 489 freehdr: 490 #if defined(LKM) || defined(_LKM) 491 lockmgr(&exec_lock, LK_RELEASE, NULL); 492 #endif 493 494 free(pack.ep_hdr, M_EXEC); 495 return error; 496 497 exec_abort: 498 #if defined(LKM) || defined(_LKM) 499 lockmgr(&exec_lock, LK_RELEASE, NULL); 500 #endif 501 502 /* 503 * the old process doesn't exist anymore. exit gracefully. 504 * get rid of the (new) address space we have created, if any, get rid 505 * of our namei data and vnode, and exit noting failure 506 */ 507 uvm_deallocate(&vm->vm_map, VM_MIN_ADDRESS, 508 VM_MAXUSER_ADDRESS - VM_MIN_ADDRESS); 509 if (pack.ep_emul_arg) 510 FREE(pack.ep_emul_arg, M_TEMP); 511 PNBUF_PUT(nid.ni_cnd.cn_pnbuf); 512 vn_lock(pack.ep_vp, LK_EXCLUSIVE | LK_RETRY); 513 VOP_CLOSE(pack.ep_vp, FREAD, cred, p); 514 vput(pack.ep_vp); 515 uvm_km_free_wakeup(exec_map, (vaddr_t) argp, NCARGS); 516 free(pack.ep_hdr, M_EXEC); 517 exit1(p, W_EXITCODE(error, SIGABRT)); 518 519 /* NOTREACHED */ 520 return 0; 521 } 522
Indexes created Tue Sep 23 02:09:52 GMT 2025