| 1 | /* $NetBSD: exec_elf.c,v 1.87 2016/09/15 18:40:34 christos Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1994, 2000, 2005, 2015 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Christos Zoulas and Maxime Villard. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | * Copyright (c) 1996 Christopher G. Demetriou |
| 34 | * All rights reserved. |
| 35 | * |
| 36 | * Redistribution and use in source and binary forms, with or without |
| 37 | * modification, are permitted provided that the following conditions |
| 38 | * are met: |
| 39 | * 1. Redistributions of source code must retain the above copyright |
| 40 | * notice, this list of conditions and the following disclaimer. |
| 41 | * 2. Redistributions in binary form must reproduce the above copyright |
| 42 | * notice, this list of conditions and the following disclaimer in the |
| 43 | * documentation and/or other materials provided with the distribution. |
| 44 | * 3. The name of the author may not be used to endorse or promote products |
| 45 | * derived from this software without specific prior written permission |
| 46 | * |
| 47 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 48 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 49 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 50 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 51 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 52 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 53 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 54 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 55 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 56 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 57 | */ |
| 58 | |
| 59 | #include <sys/cdefs.h> |
| 60 | __KERNEL_RCSID(1, "$NetBSD: exec_elf.c,v 1.87 2016/09/15 18:40:34 christos Exp $" ); |
| 61 | |
| 62 | #ifdef _KERNEL_OPT |
| 63 | #include "opt_pax.h" |
| 64 | #endif /* _KERNEL_OPT */ |
| 65 | |
| 66 | #include <sys/param.h> |
| 67 | #include <sys/proc.h> |
| 68 | #include <sys/kmem.h> |
| 69 | #include <sys/namei.h> |
| 70 | #include <sys/vnode.h> |
| 71 | #include <sys/exec.h> |
| 72 | #include <sys/exec_elf.h> |
| 73 | #include <sys/syscall.h> |
| 74 | #include <sys/signalvar.h> |
| 75 | #include <sys/mount.h> |
| 76 | #include <sys/stat.h> |
| 77 | #include <sys/kauth.h> |
| 78 | #include <sys/bitops.h> |
| 79 | |
| 80 | #include <sys/cpu.h> |
| 81 | #include <machine/reg.h> |
| 82 | |
| 83 | #include <compat/common/compat_util.h> |
| 84 | |
| 85 | #include <sys/pax.h> |
| 86 | #include <uvm/uvm_param.h> |
| 87 | |
| 88 | extern struct emul emul_netbsd; |
| 89 | |
| 90 | #define ELFNAME(check_header) |
| 91 | #define elf_copyargs ELFNAME(copyargs) |
| 92 | #define elf_load_interp ELFNAME(load_interp) |
| 93 | #define elf_load_psection ELFNAME(load_psection) |
| 94 | #define exec_elf_makecmds ELFNAME2(exec,makecmds) |
| 95 | #define netbsd_elf_signature ELFNAME2(netbsd,signature) |
| 96 | #define netbsd_elf_probe ELFNAME2(netbsd,probe) |
| 97 | #define coredump ELFNAMEEND(coredump) |
| 98 | #define elf_free_emul_arg ELFNAME(free_emul_arg) |
| 99 | |
| 100 | static int |
| 101 | elf_load_interp(struct lwp *, struct exec_package *, char *, |
| 102 | struct exec_vmcmd_set *, u_long *, Elf_Addr *); |
| 103 | static void |
| 104 | elf_load_psection(struct exec_vmcmd_set *, struct vnode *, const Elf_Phdr *, |
| 105 | Elf_Addr *, u_long *, int); |
| 106 | |
| 107 | int netbsd_elf_signature(struct lwp *, struct exec_package *, Elf_Ehdr *); |
| 108 | int netbsd_elf_probe(struct lwp *, struct exec_package *, void *, char *, |
| 109 | vaddr_t *); |
| 110 | |
| 111 | static void elf_free_emul_arg(void *); |
| 112 | |
| 113 | #ifdef DEBUG_ELF |
| 114 | #define DPRINTF(a, ...) printf("%s: " a "\n", __func__, ##__VA_ARGS__) |
| 115 | #else |
| 116 | #define DPRINTF(a, ...) |
| 117 | #endif |
| 118 | |
| 119 | /* round up and down to page boundaries. */ |
| 120 | #define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) |
| 121 | #define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) |
| 122 | |
| 123 | static void |
| 124 | elf_placedynexec(struct exec_package *epp, Elf_Ehdr *eh, Elf_Phdr *ph) |
| 125 | { |
| 126 | Elf_Addr align, offset; |
| 127 | int i; |
| 128 | |
| 129 | for (align = i = 0; i < eh->e_phnum; i++) |
| 130 | if (ph[i].p_type == PT_LOAD && ph[i].p_align > align) |
| 131 | align = ph[i].p_align; |
| 132 | |
| 133 | offset = (Elf_Addr)pax_aslr_exec_offset(epp, align); |
| 134 | offset += epp->ep_vm_minaddr; |
| 135 | |
| 136 | for (i = 0; i < eh->e_phnum; i++) |
| 137 | ph[i].p_vaddr += offset; |
| 138 | epp->ep_entryoffset = offset; |
| 139 | eh->e_entry += offset; |
| 140 | } |
| 141 | |
| 142 | /* |
| 143 | * Copy arguments onto the stack in the normal way, but add some |
| 144 | * extra information in case of dynamic binding. |
| 145 | */ |
| 146 | int |
| 147 | elf_copyargs(struct lwp *l, struct exec_package *pack, |
| 148 | struct ps_strings *arginfo, char **stackp, void *argp) |
| 149 | { |
| 150 | size_t len, vlen; |
| 151 | AuxInfo ai[ELF_AUX_ENTRIES], *a, *execname; |
| 152 | struct elf_args *ap; |
| 153 | int error; |
| 154 | |
| 155 | if ((error = copyargs(l, pack, arginfo, stackp, argp)) != 0) |
| 156 | return error; |
| 157 | |
| 158 | a = ai; |
| 159 | execname = NULL; |
| 160 | |
| 161 | memset(ai, 0, sizeof(ai)); |
| 162 | |
| 163 | /* |
| 164 | * Push extra arguments on the stack needed by dynamically |
| 165 | * linked binaries |
| 166 | */ |
| 167 | if ((ap = (struct elf_args *)pack->ep_emul_arg)) { |
| 168 | struct vattr *vap = pack->ep_vap; |
| 169 | |
| 170 | a->a_type = AT_PHDR; |
| 171 | a->a_v = ap->arg_phaddr; |
| 172 | a++; |
| 173 | |
| 174 | a->a_type = AT_PHENT; |
| 175 | a->a_v = ap->arg_phentsize; |
| 176 | a++; |
| 177 | |
| 178 | a->a_type = AT_PHNUM; |
| 179 | a->a_v = ap->arg_phnum; |
| 180 | a++; |
| 181 | |
| 182 | a->a_type = AT_PAGESZ; |
| 183 | a->a_v = PAGE_SIZE; |
| 184 | a++; |
| 185 | |
| 186 | a->a_type = AT_BASE; |
| 187 | a->a_v = ap->arg_interp; |
| 188 | a++; |
| 189 | |
| 190 | a->a_type = AT_FLAGS; |
| 191 | a->a_v = 0; |
| 192 | a++; |
| 193 | |
| 194 | a->a_type = AT_ENTRY; |
| 195 | a->a_v = ap->arg_entry; |
| 196 | a++; |
| 197 | |
| 198 | a->a_type = AT_EUID; |
| 199 | if (vap->va_mode & S_ISUID) |
| 200 | a->a_v = vap->va_uid; |
| 201 | else |
| 202 | a->a_v = kauth_cred_geteuid(l->l_cred); |
| 203 | a++; |
| 204 | |
| 205 | a->a_type = AT_RUID; |
| 206 | a->a_v = kauth_cred_getuid(l->l_cred); |
| 207 | a++; |
| 208 | |
| 209 | a->a_type = AT_EGID; |
| 210 | if (vap->va_mode & S_ISGID) |
| 211 | a->a_v = vap->va_gid; |
| 212 | else |
| 213 | a->a_v = kauth_cred_getegid(l->l_cred); |
| 214 | a++; |
| 215 | |
| 216 | a->a_type = AT_RGID; |
| 217 | a->a_v = kauth_cred_getgid(l->l_cred); |
| 218 | a++; |
| 219 | |
| 220 | a->a_type = AT_STACKBASE; |
| 221 | a->a_v = l->l_proc->p_stackbase; |
| 222 | a++; |
| 223 | |
| 224 | if (pack->ep_path) { |
| 225 | execname = a; |
| 226 | a->a_type = AT_SUN_EXECNAME; |
| 227 | a++; |
| 228 | } |
| 229 | |
| 230 | exec_free_emul_arg(pack); |
| 231 | } |
| 232 | |
| 233 | a->a_type = AT_NULL; |
| 234 | a->a_v = 0; |
| 235 | a++; |
| 236 | |
| 237 | vlen = (a - ai) * sizeof(ai[0]); |
| 238 | |
| 239 | KASSERT(vlen <= sizeof(ai)); |
| 240 | |
| 241 | if (execname) { |
| 242 | char *path = pack->ep_path; |
| 243 | execname->a_v = (uintptr_t)(*stackp + vlen); |
| 244 | len = strlen(path) + 1; |
| 245 | if ((error = copyout(path, (*stackp + vlen), len)) != 0) |
| 246 | return error; |
| 247 | len = ALIGN(len); |
| 248 | } else |
| 249 | len = 0; |
| 250 | |
| 251 | if ((error = copyout(ai, *stackp, vlen)) != 0) |
| 252 | return error; |
| 253 | *stackp += vlen + len; |
| 254 | |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | /* |
| 259 | * elf_check_header(): |
| 260 | * |
| 261 | * Check header for validity; return 0 if ok, ENOEXEC if error |
| 262 | */ |
| 263 | int |
| 264 | elf_check_header(Elf_Ehdr *eh) |
| 265 | { |
| 266 | |
| 267 | if (memcmp(eh->e_ident, ELFMAG, SELFMAG) != 0 || |
| 268 | eh->e_ident[EI_CLASS] != ELFCLASS) { |
| 269 | DPRINTF("bad magic %#x%x%x" , eh->e_ident[0], eh->e_ident[1], |
| 270 | eh->e_ident[2]); |
| 271 | return ENOEXEC; |
| 272 | } |
| 273 | |
| 274 | switch (eh->e_machine) { |
| 275 | |
| 276 | ELFDEFNNAME(MACHDEP_ID_CASES) |
| 277 | |
| 278 | default: |
| 279 | DPRINTF("bad machine %#x" , eh->e_machine); |
| 280 | return ENOEXEC; |
| 281 | } |
| 282 | |
| 283 | if (ELF_EHDR_FLAGS_OK(eh) == 0) { |
| 284 | DPRINTF("bad flags %#x" , eh->e_flags); |
| 285 | return ENOEXEC; |
| 286 | } |
| 287 | |
| 288 | if (eh->e_shnum > ELF_MAXSHNUM || eh->e_phnum > ELF_MAXPHNUM) { |
| 289 | DPRINTF("bad shnum/phnum %#x/%#x" , eh->e_shnum, eh->e_phnum); |
| 290 | return ENOEXEC; |
| 291 | } |
| 292 | |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | /* |
| 297 | * elf_load_psection(): |
| 298 | * |
| 299 | * Load a psection at the appropriate address |
| 300 | */ |
| 301 | static void |
| 302 | elf_load_psection(struct exec_vmcmd_set *vcset, struct vnode *vp, |
| 303 | const Elf_Phdr *ph, Elf_Addr *addr, u_long *size, int flags) |
| 304 | { |
| 305 | u_long msize, psize, rm, rf; |
| 306 | long diff, offset; |
| 307 | int vmprot = 0; |
| 308 | |
| 309 | /* |
| 310 | * If the user specified an address, then we load there. |
| 311 | */ |
| 312 | if (*addr == ELFDEFNNAME(NO_ADDR)) |
| 313 | *addr = ph->p_vaddr; |
| 314 | |
| 315 | if (ph->p_align > 1) { |
| 316 | /* |
| 317 | * Make sure we are virtually aligned as we are supposed to be. |
| 318 | */ |
| 319 | diff = ph->p_vaddr - ELF_TRUNC(ph->p_vaddr, ph->p_align); |
| 320 | KASSERT(*addr - diff == ELF_TRUNC(*addr, ph->p_align)); |
| 321 | /* |
| 322 | * But make sure to not map any pages before the start of the |
| 323 | * psection by limiting the difference to within a page. |
| 324 | */ |
| 325 | diff &= PAGE_MASK; |
| 326 | } else |
| 327 | diff = 0; |
| 328 | |
| 329 | vmprot |= (ph->p_flags & PF_R) ? VM_PROT_READ : 0; |
| 330 | vmprot |= (ph->p_flags & PF_W) ? VM_PROT_WRITE : 0; |
| 331 | vmprot |= (ph->p_flags & PF_X) ? VM_PROT_EXECUTE : 0; |
| 332 | |
| 333 | /* |
| 334 | * Adjust everything so it all starts on a page boundary. |
| 335 | */ |
| 336 | *addr -= diff; |
| 337 | offset = ph->p_offset - diff; |
| 338 | *size = ph->p_filesz + diff; |
| 339 | msize = ph->p_memsz + diff; |
| 340 | |
| 341 | if (ph->p_align >= PAGE_SIZE) { |
| 342 | if ((ph->p_flags & PF_W) != 0) { |
| 343 | /* |
| 344 | * Because the pagedvn pager can't handle zero fill |
| 345 | * of the last data page if it's not page aligned we |
| 346 | * map the last page readvn. |
| 347 | */ |
| 348 | psize = trunc_page(*size); |
| 349 | } else { |
| 350 | psize = round_page(*size); |
| 351 | } |
| 352 | } else { |
| 353 | psize = *size; |
| 354 | } |
| 355 | |
| 356 | if (psize > 0) { |
| 357 | NEW_VMCMD2(vcset, ph->p_align < PAGE_SIZE ? |
| 358 | vmcmd_map_readvn : vmcmd_map_pagedvn, psize, *addr, vp, |
| 359 | offset, vmprot, flags); |
| 360 | flags &= VMCMD_RELATIVE; |
| 361 | } |
| 362 | if (psize < *size) { |
| 363 | NEW_VMCMD2(vcset, vmcmd_map_readvn, *size - psize, |
| 364 | *addr + psize, vp, offset + psize, vmprot, flags); |
| 365 | } |
| 366 | |
| 367 | /* |
| 368 | * Check if we need to extend the size of the segment (does |
| 369 | * bss extend page the next page boundary)? |
| 370 | */ |
| 371 | rm = round_page(*addr + msize); |
| 372 | rf = round_page(*addr + *size); |
| 373 | |
| 374 | if (rm != rf) { |
| 375 | NEW_VMCMD2(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, |
| 376 | 0, vmprot, flags & VMCMD_RELATIVE); |
| 377 | *size = msize; |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | * elf_load_interp(): |
| 383 | * |
| 384 | * Load an interpreter pointed to by path. |
| 385 | */ |
| 386 | static int |
| 387 | elf_load_interp(struct lwp *l, struct exec_package *epp, char *path, |
| 388 | struct exec_vmcmd_set *vcset, u_long *entryoff, Elf_Addr *last) |
| 389 | { |
| 390 | int error, i; |
| 391 | struct vnode *vp; |
| 392 | struct vattr attr; |
| 393 | Elf_Ehdr eh; |
| 394 | Elf_Phdr *ph = NULL; |
| 395 | const Elf_Phdr *base_ph; |
| 396 | const Elf_Phdr *last_ph; |
| 397 | u_long phsize; |
| 398 | Elf_Addr addr = *last; |
| 399 | struct proc *p; |
| 400 | bool use_topdown; |
| 401 | |
| 402 | p = l->l_proc; |
| 403 | |
| 404 | KASSERT(p->p_vmspace); |
| 405 | KASSERT(p->p_vmspace != proc0.p_vmspace); |
| 406 | |
| 407 | #ifdef __USE_TOPDOWN_VM |
| 408 | use_topdown = epp->ep_flags & EXEC_TOPDOWN_VM; |
| 409 | #else |
| 410 | use_topdown = false; |
| 411 | #endif |
| 412 | |
| 413 | /* |
| 414 | * 1. open file |
| 415 | * 2. read filehdr |
| 416 | * 3. map text, data, and bss out of it using VM_* |
| 417 | */ |
| 418 | vp = epp->ep_interp; |
| 419 | if (vp == NULL) { |
| 420 | error = emul_find_interp(l, epp, path); |
| 421 | if (error != 0) |
| 422 | return error; |
| 423 | vp = epp->ep_interp; |
| 424 | } |
| 425 | /* We'll tidy this ourselves - otherwise we have locking issues */ |
| 426 | epp->ep_interp = NULL; |
| 427 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 428 | |
| 429 | /* |
| 430 | * Similarly, if it's not marked as executable, or it's not a regular |
| 431 | * file, we don't allow it to be used. |
| 432 | */ |
| 433 | if (vp->v_type != VREG) { |
| 434 | error = EACCES; |
| 435 | goto badunlock; |
| 436 | } |
| 437 | if ((error = VOP_ACCESS(vp, VEXEC, l->l_cred)) != 0) |
| 438 | goto badunlock; |
| 439 | |
| 440 | /* get attributes */ |
| 441 | if ((error = VOP_GETATTR(vp, &attr, l->l_cred)) != 0) |
| 442 | goto badunlock; |
| 443 | |
| 444 | /* |
| 445 | * Check mount point. Though we're not trying to exec this binary, |
| 446 | * we will be executing code from it, so if the mount point |
| 447 | * disallows execution or set-id-ness, we punt or kill the set-id. |
| 448 | */ |
| 449 | if (vp->v_mount->mnt_flag & MNT_NOEXEC) { |
| 450 | error = EACCES; |
| 451 | goto badunlock; |
| 452 | } |
| 453 | if (vp->v_mount->mnt_flag & MNT_NOSUID) |
| 454 | epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID); |
| 455 | |
| 456 | error = vn_marktext(vp); |
| 457 | if (error) |
| 458 | goto badunlock; |
| 459 | |
| 460 | VOP_UNLOCK(vp); |
| 461 | |
| 462 | if ((error = exec_read_from(l, vp, 0, &eh, sizeof(eh))) != 0) |
| 463 | goto bad; |
| 464 | |
| 465 | if ((error = elf_check_header(&eh)) != 0) |
| 466 | goto bad; |
| 467 | if (eh.e_type != ET_DYN || eh.e_phnum == 0) { |
| 468 | DPRINTF("bad interpreter type %#x" , eh.e_type); |
| 469 | error = ENOEXEC; |
| 470 | goto bad; |
| 471 | } |
| 472 | |
| 473 | phsize = eh.e_phnum * sizeof(Elf_Phdr); |
| 474 | ph = kmem_alloc(phsize, KM_SLEEP); |
| 475 | |
| 476 | if ((error = exec_read_from(l, vp, eh.e_phoff, ph, phsize)) != 0) |
| 477 | goto bad; |
| 478 | |
| 479 | #ifdef ELF_INTERP_NON_RELOCATABLE |
| 480 | /* |
| 481 | * Evil hack: Only MIPS should be non-relocatable, and the |
| 482 | * psections should have a high address (typically 0x5ffe0000). |
| 483 | * If it's now relocatable, it should be linked at 0 and the |
| 484 | * psections should have zeros in the upper part of the address. |
| 485 | * Otherwise, force the load at the linked address. |
| 486 | */ |
| 487 | if (*last == ELF_LINK_ADDR && (ph->p_vaddr & 0xffff0000) == 0) |
| 488 | *last = ELFDEFNNAME(NO_ADDR); |
| 489 | #endif |
| 490 | |
| 491 | /* |
| 492 | * If no position to load the interpreter was set by a probe |
| 493 | * function, pick the same address that a non-fixed mmap(0, ..) |
| 494 | * would (i.e. something safely out of the way). |
| 495 | */ |
| 496 | if (*last == ELFDEFNNAME(NO_ADDR)) { |
| 497 | u_long limit = 0; |
| 498 | /* |
| 499 | * Find the start and ending addresses of the psections to |
| 500 | * be loaded. This will give us the size. |
| 501 | */ |
| 502 | for (i = 0, base_ph = NULL; i < eh.e_phnum; i++) { |
| 503 | if (ph[i].p_type == PT_LOAD) { |
| 504 | u_long psize = ph[i].p_vaddr + ph[i].p_memsz; |
| 505 | if (base_ph == NULL) |
| 506 | base_ph = &ph[i]; |
| 507 | if (psize > limit) |
| 508 | limit = psize; |
| 509 | } |
| 510 | } |
| 511 | |
| 512 | if (base_ph == NULL) { |
| 513 | DPRINTF("no interpreter loadable sections" ); |
| 514 | error = ENOEXEC; |
| 515 | goto bad; |
| 516 | } |
| 517 | |
| 518 | /* |
| 519 | * Now compute the size and load address. |
| 520 | */ |
| 521 | addr = (*epp->ep_esch->es_emul->e_vm_default_addr)(p, |
| 522 | epp->ep_daddr, |
| 523 | round_page(limit) - trunc_page(base_ph->p_vaddr), |
| 524 | use_topdown); |
| 525 | addr += (Elf_Addr)pax_aslr_rtld_offset(epp, base_ph->p_align, |
| 526 | use_topdown); |
| 527 | } else { |
| 528 | addr = *last; /* may be ELF_LINK_ADDR */ |
| 529 | } |
| 530 | |
| 531 | /* |
| 532 | * Load all the necessary sections |
| 533 | */ |
| 534 | for (i = 0, base_ph = NULL, last_ph = NULL; i < eh.e_phnum; i++) { |
| 535 | switch (ph[i].p_type) { |
| 536 | case PT_LOAD: { |
| 537 | u_long size; |
| 538 | int flags; |
| 539 | |
| 540 | if (base_ph == NULL) { |
| 541 | /* |
| 542 | * First encountered psection is always the |
| 543 | * base psection. Make sure it's aligned |
| 544 | * properly (align down for topdown and align |
| 545 | * upwards for not topdown). |
| 546 | */ |
| 547 | base_ph = &ph[i]; |
| 548 | flags = VMCMD_BASE; |
| 549 | if (addr == ELF_LINK_ADDR) |
| 550 | addr = ph[i].p_vaddr; |
| 551 | if (use_topdown) |
| 552 | addr = ELF_TRUNC(addr, ph[i].p_align); |
| 553 | else |
| 554 | addr = ELF_ROUND(addr, ph[i].p_align); |
| 555 | } else { |
| 556 | u_long limit = round_page(last_ph->p_vaddr |
| 557 | + last_ph->p_memsz); |
| 558 | u_long base = trunc_page(ph[i].p_vaddr); |
| 559 | |
| 560 | /* |
| 561 | * If there is a gap in between the psections, |
| 562 | * map it as inaccessible so nothing else |
| 563 | * mmap'ed will be placed there. |
| 564 | */ |
| 565 | if (limit != base) { |
| 566 | NEW_VMCMD2(vcset, vmcmd_map_zero, |
| 567 | base - limit, |
| 568 | limit - base_ph->p_vaddr, NULLVP, |
| 569 | 0, VM_PROT_NONE, VMCMD_RELATIVE); |
| 570 | } |
| 571 | |
| 572 | addr = ph[i].p_vaddr - base_ph->p_vaddr; |
| 573 | flags = VMCMD_RELATIVE; |
| 574 | } |
| 575 | last_ph = &ph[i]; |
| 576 | elf_load_psection(vcset, vp, &ph[i], &addr, |
| 577 | &size, flags); |
| 578 | /* |
| 579 | * If entry is within this psection then this |
| 580 | * must contain the .text section. *entryoff is |
| 581 | * relative to the base psection. |
| 582 | */ |
| 583 | if (eh.e_entry >= ph[i].p_vaddr && |
| 584 | eh.e_entry < (ph[i].p_vaddr + size)) { |
| 585 | *entryoff = eh.e_entry - base_ph->p_vaddr; |
| 586 | } |
| 587 | addr += size; |
| 588 | break; |
| 589 | } |
| 590 | |
| 591 | default: |
| 592 | break; |
| 593 | } |
| 594 | } |
| 595 | |
| 596 | kmem_free(ph, phsize); |
| 597 | /* |
| 598 | * This value is ignored if TOPDOWN. |
| 599 | */ |
| 600 | *last = addr; |
| 601 | vrele(vp); |
| 602 | return 0; |
| 603 | |
| 604 | badunlock: |
| 605 | VOP_UNLOCK(vp); |
| 606 | |
| 607 | bad: |
| 608 | if (ph != NULL) |
| 609 | kmem_free(ph, phsize); |
| 610 | vrele(vp); |
| 611 | return error; |
| 612 | } |
| 613 | |
| 614 | /* |
| 615 | * exec_elf_makecmds(): Prepare an Elf binary's exec package |
| 616 | * |
| 617 | * First, set of the various offsets/lengths in the exec package. |
| 618 | * |
| 619 | * Then, mark the text image busy (so it can be demand paged) or error |
| 620 | * out if this is not possible. Finally, set up vmcmds for the |
| 621 | * text, data, bss, and stack segments. |
| 622 | */ |
| 623 | int |
| 624 | exec_elf_makecmds(struct lwp *l, struct exec_package *epp) |
| 625 | { |
| 626 | Elf_Ehdr *eh = epp->ep_hdr; |
| 627 | Elf_Phdr *ph, *pp; |
| 628 | Elf_Addr phdr = 0, computed_phdr = 0, pos = 0, end_text = 0; |
| 629 | int error, i; |
| 630 | char *interp = NULL; |
| 631 | u_long phsize; |
| 632 | struct elf_args *ap; |
| 633 | bool is_dyn = false; |
| 634 | |
| 635 | if (epp->ep_hdrvalid < sizeof(Elf_Ehdr)) { |
| 636 | DPRINTF("small header %#x" , epp->ep_hdrvalid); |
| 637 | return ENOEXEC; |
| 638 | } |
| 639 | if ((error = elf_check_header(eh)) != 0) |
| 640 | return error; |
| 641 | |
| 642 | if (eh->e_type == ET_DYN) |
| 643 | /* PIE, and some libs have an entry point */ |
| 644 | is_dyn = true; |
| 645 | else if (eh->e_type != ET_EXEC) { |
| 646 | DPRINTF("bad type %#x" , eh->e_type); |
| 647 | return ENOEXEC; |
| 648 | } |
| 649 | |
| 650 | if (eh->e_phnum == 0) { |
| 651 | DPRINTF("no program headers" ); |
| 652 | return ENOEXEC; |
| 653 | } |
| 654 | |
| 655 | error = vn_marktext(epp->ep_vp); |
| 656 | if (error) |
| 657 | return error; |
| 658 | |
| 659 | /* |
| 660 | * Allocate space to hold all the program headers, and read them |
| 661 | * from the file |
| 662 | */ |
| 663 | phsize = eh->e_phnum * sizeof(Elf_Phdr); |
| 664 | ph = kmem_alloc(phsize, KM_SLEEP); |
| 665 | |
| 666 | if ((error = exec_read_from(l, epp->ep_vp, eh->e_phoff, ph, phsize)) != |
| 667 | 0) |
| 668 | goto bad; |
| 669 | |
| 670 | epp->ep_taddr = epp->ep_tsize = ELFDEFNNAME(NO_ADDR); |
| 671 | epp->ep_daddr = epp->ep_dsize = ELFDEFNNAME(NO_ADDR); |
| 672 | |
| 673 | for (i = 0; i < eh->e_phnum; i++) { |
| 674 | pp = &ph[i]; |
| 675 | if (pp->p_type == PT_INTERP) { |
| 676 | if (pp->p_filesz < 2 || pp->p_filesz > MAXPATHLEN) { |
| 677 | DPRINTF("bad interpreter namelen %#jx" , |
| 678 | (uintmax_t)pp->p_filesz); |
| 679 | error = ENOEXEC; |
| 680 | goto bad; |
| 681 | } |
| 682 | interp = PNBUF_GET(); |
| 683 | if ((error = exec_read_from(l, epp->ep_vp, |
| 684 | pp->p_offset, interp, pp->p_filesz)) != 0) |
| 685 | goto bad; |
| 686 | /* Ensure interp is NUL-terminated and of the expected length */ |
| 687 | if (strnlen(interp, pp->p_filesz) != pp->p_filesz - 1) { |
| 688 | DPRINTF("bad interpreter name" ); |
| 689 | error = ENOEXEC; |
| 690 | goto bad; |
| 691 | } |
| 692 | break; |
| 693 | } |
| 694 | } |
| 695 | |
| 696 | /* |
| 697 | * On the same architecture, we may be emulating different systems. |
| 698 | * See which one will accept this executable. |
| 699 | * |
| 700 | * Probe functions would normally see if the interpreter (if any) |
| 701 | * exists. Emulation packages may possibly replace the interpreter in |
| 702 | * interp with a changed path (/emul/xxx/<path>). |
| 703 | */ |
| 704 | pos = ELFDEFNNAME(NO_ADDR); |
| 705 | if (epp->ep_esch->u.elf_probe_func) { |
| 706 | vaddr_t startp = (vaddr_t)pos; |
| 707 | |
| 708 | error = (*epp->ep_esch->u.elf_probe_func)(l, epp, eh, interp, |
| 709 | &startp); |
| 710 | if (error) |
| 711 | goto bad; |
| 712 | pos = (Elf_Addr)startp; |
| 713 | } |
| 714 | |
| 715 | if (is_dyn) |
| 716 | elf_placedynexec(epp, eh, ph); |
| 717 | |
| 718 | /* |
| 719 | * Load all the necessary sections |
| 720 | */ |
| 721 | for (i = 0; i < eh->e_phnum; i++) { |
| 722 | Elf_Addr addr = ELFDEFNNAME(NO_ADDR); |
| 723 | u_long size = 0; |
| 724 | |
| 725 | switch (ph[i].p_type) { |
| 726 | case PT_LOAD: |
| 727 | elf_load_psection(&epp->ep_vmcmds, epp->ep_vp, |
| 728 | &ph[i], &addr, &size, VMCMD_FIXED); |
| 729 | |
| 730 | /* |
| 731 | * Consider this as text segment, if it is executable. |
| 732 | * If there is more than one text segment, pick the |
| 733 | * largest. |
| 734 | */ |
| 735 | if (ph[i].p_flags & PF_X) { |
| 736 | if (epp->ep_taddr == ELFDEFNNAME(NO_ADDR) || |
| 737 | size > epp->ep_tsize) { |
| 738 | epp->ep_taddr = addr; |
| 739 | epp->ep_tsize = size; |
| 740 | } |
| 741 | end_text = addr + size; |
| 742 | } else { |
| 743 | epp->ep_daddr = addr; |
| 744 | epp->ep_dsize = size; |
| 745 | } |
| 746 | if (ph[i].p_offset == 0) { |
| 747 | computed_phdr = ph[i].p_vaddr + eh->e_phoff; |
| 748 | } |
| 749 | break; |
| 750 | |
| 751 | case PT_SHLIB: |
| 752 | /* SCO has these sections. */ |
| 753 | case PT_INTERP: |
| 754 | /* Already did this one. */ |
| 755 | case PT_DYNAMIC: |
| 756 | case PT_NOTE: |
| 757 | break; |
| 758 | case PT_PHDR: |
| 759 | /* Note address of program headers (in text segment) */ |
| 760 | phdr = ph[i].p_vaddr; |
| 761 | break; |
| 762 | |
| 763 | default: |
| 764 | /* |
| 765 | * Not fatal; we don't need to understand everything. |
| 766 | */ |
| 767 | break; |
| 768 | } |
| 769 | } |
| 770 | |
| 771 | if (epp->ep_vmcmds.evs_used == 0) { |
| 772 | /* No VMCMD; there was no PT_LOAD section, or those |
| 773 | * sections were empty */ |
| 774 | DPRINTF("no vmcommands" ); |
| 775 | error = ENOEXEC; |
| 776 | goto bad; |
| 777 | } |
| 778 | |
| 779 | if (epp->ep_daddr == ELFDEFNNAME(NO_ADDR)) { |
| 780 | epp->ep_daddr = round_page(end_text); |
| 781 | epp->ep_dsize = 0; |
| 782 | } |
| 783 | |
| 784 | /* |
| 785 | * Check if we found a dynamically linked binary and arrange to load |
| 786 | * its interpreter |
| 787 | */ |
| 788 | if (interp) { |
| 789 | u_int nused = epp->ep_vmcmds.evs_used; |
| 790 | u_long interp_offset = 0; |
| 791 | |
| 792 | if ((error = elf_load_interp(l, epp, interp, |
| 793 | &epp->ep_vmcmds, &interp_offset, &pos)) != 0) { |
| 794 | goto bad; |
| 795 | } |
| 796 | if (epp->ep_vmcmds.evs_used == nused) { |
| 797 | /* elf_load_interp() has not set up any new VMCMD */ |
| 798 | DPRINTF("no vmcommands for interpreter" ); |
| 799 | error = ENOEXEC; |
| 800 | goto bad; |
| 801 | } |
| 802 | |
| 803 | ap = kmem_alloc(sizeof(*ap), KM_SLEEP); |
| 804 | ap->arg_interp = epp->ep_vmcmds.evs_cmds[nused].ev_addr; |
| 805 | epp->ep_entryoffset = interp_offset; |
| 806 | epp->ep_entry = ap->arg_interp + interp_offset; |
| 807 | PNBUF_PUT(interp); |
| 808 | interp = NULL; |
| 809 | } else { |
| 810 | epp->ep_entry = eh->e_entry; |
| 811 | if (epp->ep_flags & EXEC_FORCEAUX) { |
| 812 | ap = kmem_alloc(sizeof(*ap), KM_SLEEP); |
| 813 | ap->arg_interp = (vaddr_t)NULL; |
| 814 | } else |
| 815 | ap = NULL; |
| 816 | } |
| 817 | |
| 818 | if (ap) { |
| 819 | ap->arg_phaddr = phdr ? phdr : computed_phdr; |
| 820 | ap->arg_phentsize = eh->e_phentsize; |
| 821 | ap->arg_phnum = eh->e_phnum; |
| 822 | ap->arg_entry = eh->e_entry; |
| 823 | epp->ep_emul_arg = ap; |
| 824 | epp->ep_emul_arg_free = elf_free_emul_arg; |
| 825 | } |
| 826 | |
| 827 | #ifdef ELF_MAP_PAGE_ZERO |
| 828 | /* Dell SVR4 maps page zero, yeuch! */ |
| 829 | NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, PAGE_SIZE, 0, |
| 830 | epp->ep_vp, 0, VM_PROT_READ); |
| 831 | #endif |
| 832 | |
| 833 | error = (*epp->ep_esch->es_setup_stack)(l, epp); |
| 834 | if (error) |
| 835 | goto bad; |
| 836 | |
| 837 | kmem_free(ph, phsize); |
| 838 | return 0; |
| 839 | |
| 840 | bad: |
| 841 | if (interp) |
| 842 | PNBUF_PUT(interp); |
| 843 | exec_free_emul_arg(epp); |
| 844 | kmem_free(ph, phsize); |
| 845 | kill_vmcmds(&epp->ep_vmcmds); |
| 846 | return error; |
| 847 | } |
| 848 | |
| 849 | int |
| 850 | netbsd_elf_signature(struct lwp *l, struct exec_package *epp, |
| 851 | Elf_Ehdr *eh) |
| 852 | { |
| 853 | size_t i; |
| 854 | Elf_Shdr *sh; |
| 855 | Elf_Nhdr *np; |
| 856 | size_t shsize, nsize; |
| 857 | int error; |
| 858 | int isnetbsd = 0; |
| 859 | char *ndata, *ndesc; |
| 860 | |
| 861 | #ifdef DIAGNOSTIC |
| 862 | const char *badnote; |
| 863 | #define BADNOTE(n) badnote = (n) |
| 864 | #else |
| 865 | #define BADNOTE(n) |
| 866 | #endif |
| 867 | |
| 868 | epp->ep_pax_flags = 0; |
| 869 | if (eh->e_shnum > ELF_MAXSHNUM || eh->e_shnum == 0) { |
| 870 | DPRINTF("no signature %#x" , eh->e_shnum); |
| 871 | return ENOEXEC; |
| 872 | } |
| 873 | |
| 874 | shsize = eh->e_shnum * sizeof(Elf_Shdr); |
| 875 | sh = kmem_alloc(shsize, KM_SLEEP); |
| 876 | error = exec_read_from(l, epp->ep_vp, eh->e_shoff, sh, shsize); |
| 877 | if (error) |
| 878 | goto out; |
| 879 | |
| 880 | np = kmem_alloc(ELF_MAXNOTESIZE, KM_SLEEP); |
| 881 | for (i = 0; i < eh->e_shnum; i++) { |
| 882 | Elf_Shdr *shp = &sh[i]; |
| 883 | |
| 884 | if (shp->sh_type != SHT_NOTE || |
| 885 | shp->sh_size > ELF_MAXNOTESIZE || |
| 886 | shp->sh_size < sizeof(Elf_Nhdr) + ELF_NOTE_NETBSD_NAMESZ) |
| 887 | continue; |
| 888 | |
| 889 | error = exec_read_from(l, epp->ep_vp, shp->sh_offset, np, |
| 890 | shp->sh_size); |
| 891 | if (error) |
| 892 | continue; |
| 893 | |
| 894 | /* Point to the note, skip the header */ |
| 895 | ndata = (char *)(np + 1); |
| 896 | |
| 897 | /* |
| 898 | * Padding is present if necessary to ensure 4-byte alignment. |
| 899 | * The actual section size is therefore: |
| 900 | * header size + 4-byte aligned name + 4-byte aligned desc |
| 901 | * Ensure this size is consistent with what is indicated |
| 902 | * in sh_size. The first check avoids integer overflows. |
| 903 | * |
| 904 | * Binaries from before NetBSD 1.6 have two notes in the same |
| 905 | * note section. The second note was never used, so as long as |
| 906 | * the section is at least as big as it should be, it's ok. |
| 907 | * These binaries also have a second note section with a note of |
| 908 | * type ELF_NOTE_TYPE_NETBSD_TAG, which can be ignored as well. |
| 909 | */ |
| 910 | if (np->n_namesz > shp->sh_size || np->n_descsz > shp->sh_size) { |
| 911 | BADNOTE("note size limit" ); |
| 912 | goto bad; |
| 913 | } |
| 914 | nsize = sizeof(*np) + roundup(np->n_namesz, 4) + |
| 915 | roundup(np->n_descsz, 4); |
| 916 | if (nsize > shp->sh_size) { |
| 917 | BADNOTE("note size" ); |
| 918 | goto bad; |
| 919 | } |
| 920 | ndesc = ndata + roundup(np->n_namesz, 4); |
| 921 | |
| 922 | switch (np->n_type) { |
| 923 | case ELF_NOTE_TYPE_NETBSD_TAG: |
| 924 | /* It is us */ |
| 925 | if (np->n_namesz == ELF_NOTE_NETBSD_NAMESZ && |
| 926 | np->n_descsz == ELF_NOTE_NETBSD_DESCSZ && |
| 927 | memcmp(ndata, ELF_NOTE_NETBSD_NAME, |
| 928 | ELF_NOTE_NETBSD_NAMESZ) == 0) { |
| 929 | memcpy(&epp->ep_osversion, ndesc, |
| 930 | ELF_NOTE_NETBSD_DESCSZ); |
| 931 | isnetbsd = 1; |
| 932 | break; |
| 933 | } |
| 934 | |
| 935 | /* |
| 936 | * Ignore SuSE tags; SuSE's n_type is the same the |
| 937 | * NetBSD one. |
| 938 | */ |
| 939 | if (np->n_namesz == ELF_NOTE_SUSE_NAMESZ && |
| 940 | memcmp(ndata, ELF_NOTE_SUSE_NAME, |
| 941 | ELF_NOTE_SUSE_NAMESZ) == 0) |
| 942 | break; |
| 943 | /* |
| 944 | * Ignore old GCC |
| 945 | */ |
| 946 | if (np->n_namesz == ELF_NOTE_OGCC_NAMESZ && |
| 947 | memcmp(ndata, ELF_NOTE_OGCC_NAME, |
| 948 | ELF_NOTE_OGCC_NAMESZ) == 0) |
| 949 | break; |
| 950 | BADNOTE("NetBSD tag" ); |
| 951 | goto bad; |
| 952 | |
| 953 | case ELF_NOTE_TYPE_PAX_TAG: |
| 954 | if (np->n_namesz == ELF_NOTE_PAX_NAMESZ && |
| 955 | np->n_descsz == ELF_NOTE_PAX_DESCSZ && |
| 956 | memcmp(ndata, ELF_NOTE_PAX_NAME, |
| 957 | ELF_NOTE_PAX_NAMESZ) == 0) { |
| 958 | uint32_t flags; |
| 959 | memcpy(&flags, ndesc, sizeof(flags)); |
| 960 | /* Convert the flags and insert them into |
| 961 | * the exec package. */ |
| 962 | pax_setup_elf_flags(epp, flags); |
| 963 | break; |
| 964 | } |
| 965 | BADNOTE("PaX tag" ); |
| 966 | goto bad; |
| 967 | |
| 968 | case ELF_NOTE_TYPE_MARCH_TAG: |
| 969 | /* Copy the machine arch into the package. */ |
| 970 | if (np->n_namesz == ELF_NOTE_MARCH_NAMESZ |
| 971 | && memcmp(ndata, ELF_NOTE_MARCH_NAME, |
| 972 | ELF_NOTE_MARCH_NAMESZ) == 0) { |
| 973 | /* Do not truncate the buffer */ |
| 974 | if (np->n_descsz > sizeof(epp->ep_machine_arch)) { |
| 975 | BADNOTE("description size limit" ); |
| 976 | goto bad; |
| 977 | } |
| 978 | /* |
| 979 | * Ensure ndesc is NUL-terminated and of the |
| 980 | * expected length. |
| 981 | */ |
| 982 | if (strnlen(ndesc, np->n_descsz) + 1 != |
| 983 | np->n_descsz) { |
| 984 | BADNOTE("description size" ); |
| 985 | goto bad; |
| 986 | } |
| 987 | strlcpy(epp->ep_machine_arch, ndesc, |
| 988 | sizeof(epp->ep_machine_arch)); |
| 989 | break; |
| 990 | } |
| 991 | BADNOTE("march tag" ); |
| 992 | goto bad; |
| 993 | |
| 994 | case ELF_NOTE_TYPE_MCMODEL_TAG: |
| 995 | /* arch specific check for code model */ |
| 996 | #ifdef ELF_MD_MCMODEL_CHECK |
| 997 | if (np->n_namesz == ELF_NOTE_MCMODEL_NAMESZ |
| 998 | && memcmp(ndata, ELF_NOTE_MCMODEL_NAME, |
| 999 | ELF_NOTE_MCMODEL_NAMESZ) == 0) { |
| 1000 | ELF_MD_MCMODEL_CHECK(epp, ndesc, np->n_descsz); |
| 1001 | break; |
| 1002 | } |
| 1003 | BADNOTE("mcmodel tag" ); |
| 1004 | goto bad; |
| 1005 | #endif |
| 1006 | break; |
| 1007 | |
| 1008 | case ELF_NOTE_TYPE_SUSE_VERSION_TAG: |
| 1009 | break; |
| 1010 | |
| 1011 | case ELF_NOTE_TYPE_GO_BUILDID_TAG: |
| 1012 | break; |
| 1013 | |
| 1014 | default: |
| 1015 | BADNOTE("unknown tag" ); |
| 1016 | bad: |
| 1017 | #ifdef DIAGNOSTIC |
| 1018 | /* Ignore GNU tags */ |
| 1019 | if (np->n_namesz == ELF_NOTE_GNU_NAMESZ && |
| 1020 | memcmp(ndata, ELF_NOTE_GNU_NAME, |
| 1021 | ELF_NOTE_GNU_NAMESZ) == 0) |
| 1022 | break; |
| 1023 | |
| 1024 | int ns = MIN(np->n_namesz, shp->sh_size - sizeof(*np)); |
| 1025 | printf("%s: Unknown elf note type %d (%s): " |
| 1026 | "[namesz=%d, descsz=%d name=%-*.*s]\n" , |
| 1027 | epp->ep_kname, np->n_type, badnote, np->n_namesz, |
| 1028 | np->n_descsz, ns, ns, ndata); |
| 1029 | #endif |
| 1030 | break; |
| 1031 | } |
| 1032 | } |
| 1033 | kmem_free(np, ELF_MAXNOTESIZE); |
| 1034 | |
| 1035 | error = isnetbsd ? 0 : ENOEXEC; |
| 1036 | #ifdef DEBUG_ELF |
| 1037 | if (error) |
| 1038 | DPRINTF("not netbsd" ); |
| 1039 | #endif |
| 1040 | out: |
| 1041 | kmem_free(sh, shsize); |
| 1042 | return error; |
| 1043 | } |
| 1044 | |
| 1045 | int |
| 1046 | netbsd_elf_probe(struct lwp *l, struct exec_package *epp, void *eh, char *itp, |
| 1047 | vaddr_t *pos) |
| 1048 | { |
| 1049 | int error; |
| 1050 | |
| 1051 | if ((error = netbsd_elf_signature(l, epp, eh)) != 0) |
| 1052 | return error; |
| 1053 | #ifdef ELF_MD_PROBE_FUNC |
| 1054 | if ((error = ELF_MD_PROBE_FUNC(l, epp, eh, itp, pos)) != 0) |
| 1055 | return error; |
| 1056 | #elif defined(ELF_INTERP_NON_RELOCATABLE) |
| 1057 | *pos = ELF_LINK_ADDR; |
| 1058 | #endif |
| 1059 | epp->ep_flags |= EXEC_FORCEAUX; |
| 1060 | return 0; |
| 1061 | } |
| 1062 | |
| 1063 | void |
| 1064 | elf_free_emul_arg(void *arg) |
| 1065 | { |
| 1066 | struct elf_args *ap = arg; |
| 1067 | KASSERT(ap != NULL); |
| 1068 | kmem_free(ap, sizeof(*ap)); |
| 1069 | } |
| 1070 | |