387169ac67
It is possible to specify the member name in parens after the path, e.g. sudoers.a(shr.o) for 32-bit or sudoers.a(shr_64.o) for 64-bit. If no member is specified in the path and dlopen() fails with ENOEXEC, try again with an explicit member, either shr.o or shr_64.o.
357 lines
7.9 KiB
C
357 lines
7.9 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2010, 2012-2014 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if defined(HAVE_SHL_LOAD)
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# include <dl.h>
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#elif defined(HAVE_DLOPEN)
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# include <dlfcn.h>
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#endif
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#include <errno.h>
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#include "sudo_compat.h"
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#include "sudo_dso.h"
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/*
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* Pointer for statically compiled symbols.
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*/
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static struct sudo_preload_table *preload_table;
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void
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sudo_dso_preload_table_v1(struct sudo_preload_table *table)
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{
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preload_table = table;
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}
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#if defined(HAVE_SHL_LOAD)
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# ifndef DYNAMIC_PATH
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# define DYNAMIC_PATH 0
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# endif
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void *
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sudo_dso_load_v1(const char *path, int mode)
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{
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struct sudo_preload_table *pt;
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int flags = DYNAMIC_PATH | BIND_VERBOSE;
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if (mode == 0)
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mode = SUDO_DSO_LAZY; /* default behavior */
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/* Check prelinked symbols first. */
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if (preload_table != NULL) {
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for (pt = preload_table; pt->handle != NULL; pt++) {
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if (pt->path != NULL && strcmp(path, pt->path) == 0)
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return pt->handle;
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}
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}
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/* We don't support SUDO_DSO_GLOBAL or SUDO_DSO_LOCAL yet. */
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if (ISSET(mode, SUDO_DSO_LAZY))
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flags |= BIND_DEFERRED;
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if (ISSET(mode, SUDO_DSO_NOW))
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flags |= BIND_IMMEDIATE;
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return (void *)shl_load(path, flags, 0L);
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}
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int
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sudo_dso_unload_v1(void *handle)
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{
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struct sudo_preload_table *pt;
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/* Check prelinked symbols first. */
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if (preload_table != NULL) {
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for (pt = preload_table; pt->handle != NULL; pt++) {
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if (pt->handle == handle)
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return 0;
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}
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}
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return shl_unload((shl_t)handle);
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}
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void *
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sudo_dso_findsym_v1(void *vhandle, const char *symbol)
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{
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struct sudo_preload_table *pt;
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shl_t handle = vhandle;
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void *value = NULL;
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/* Check prelinked symbols first. */
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if (preload_table != NULL) {
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for (pt = preload_table; pt->handle != NULL; pt++) {
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if (pt->handle == handle) {
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struct sudo_preload_symbol *sym;
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for (sym = pt->symbols; sym->name != NULL; sym++) {
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if (strcmp(sym->name, symbol) == 0)
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return sym->addr;
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}
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errno = ENOENT;
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return NULL;
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}
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}
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}
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/*
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* Note that the behavior of of SUDO_DSO_NEXT and SUDO_DSO_SELF
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* differs from most implementations when called from
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* a shared library.
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*/
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if (vhandle == SUDO_DSO_NEXT) {
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/* Iterate over all shared libs looking for symbol. */
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shl_t myhandle = PROG_HANDLE;
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struct shl_descriptor *desc;
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int idx = 0;
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/* Find program's real handle. */
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if (shl_gethandle(PROG_HANDLE, &desc) == 0)
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myhandle = desc->handle;
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while (shl_get(idx++, &desc) == 0) {
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if (desc->handle == myhandle)
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continue;
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if (shl_findsym(&desc->handle, symbol, TYPE_UNDEFINED, &value) == 0)
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break;
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}
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} else {
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if (vhandle == SUDO_DSO_DEFAULT)
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handle = NULL;
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else if (vhandle == SUDO_DSO_SELF)
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handle = PROG_HANDLE;
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(void)shl_findsym(&handle, symbol, TYPE_UNDEFINED, &value);
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}
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return value;
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}
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char *
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sudo_dso_strerror_v1(void)
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{
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return strerror(errno);
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}
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#elif defined(HAVE_DLOPEN)
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# ifndef RTLD_GLOBAL
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# define RTLD_GLOBAL 0
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# endif
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/* Default member names for AIX when dlopen()ing an ar (.a) file. */
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# ifdef RTLD_MEMBER
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# ifdef __LP64__
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# define SUDO_DSO_MEMBER "shr_64.o"
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# else
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# define SUDO_DSO_MEMBER "shr.o"
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# endif
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# endif
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void *
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sudo_dso_load_v1(const char *path, int mode)
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{
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struct sudo_preload_table *pt;
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int flags = 0;
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void *ret;
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#ifdef RTLD_MEMBER
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char *cp;
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#endif
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/* Check prelinked symbols first. */
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if (preload_table != NULL) {
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for (pt = preload_table; pt->handle != NULL; pt++) {
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if (pt->path != NULL && strcmp(path, pt->path) == 0)
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return pt->handle;
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}
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}
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/* Map SUDO_DSO_* -> RTLD_* */
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if (ISSET(mode, SUDO_DSO_LAZY))
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SET(flags, RTLD_LAZY);
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if (ISSET(mode, SUDO_DSO_NOW))
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SET(flags, RTLD_NOW);
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if (ISSET(mode, SUDO_DSO_GLOBAL))
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SET(flags, RTLD_GLOBAL);
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if (ISSET(mode, SUDO_DSO_LOCAL))
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SET(flags, RTLD_LOCAL);
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#ifdef RTLD_MEMBER
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/* Check for AIX path(module) syntax and add RTLD_MEMBER for a module. */
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cp = strrchr(path, '(');
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if (cp != NULL) {
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size_t len = strlen(cp);
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if (len > 2 && cp[len - 1] == '\0')
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SET(flags, RTLD_MEMBER);
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}
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#endif /* RTLD_MEMBER */
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ret = dlopen(path, flags);
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#ifdef RTLD_MEMBER
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/*
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* If we try to dlopen() an AIX .a file without an explicit member
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* it will fail with ENOEXEC. Try again using the default member.
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*/
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if (ret == NULL && !ISSET(flags, RTLD_MEMBER) && errno == ENOEXEC) {
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if (asprintf(&cp, "%s(%s)", path, SUDO_DSO_MEMBER) != -1) {
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ret = dlopen(cp, flags|RTLD_MEMBER);
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free(cp);
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}
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}
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#endif /* RTLD_MEMBER */
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return ret;
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}
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int
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sudo_dso_unload_v1(void *handle)
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{
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struct sudo_preload_table *pt;
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/* Check prelinked symbols first. */
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if (preload_table != NULL) {
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for (pt = preload_table; pt->handle != NULL; pt++) {
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if (pt->handle == handle)
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return 0;
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}
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}
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return dlclose(handle);
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}
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void *
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sudo_dso_findsym_v1(void *handle, const char *symbol)
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{
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struct sudo_preload_table *pt;
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/* Check prelinked symbols first. */
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if (preload_table != NULL) {
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for (pt = preload_table; pt->handle != NULL; pt++) {
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if (pt->handle == handle) {
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struct sudo_preload_symbol *sym;
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for (sym = pt->symbols; sym->name != NULL; sym++) {
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if (strcmp(sym->name, symbol) == 0)
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return sym->addr;
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}
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errno = ENOENT;
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return NULL;
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}
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}
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}
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/*
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* Not all implementations support the special handles.
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*/
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if (handle == SUDO_DSO_NEXT) {
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# ifdef RTLD_NEXT
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handle = RTLD_NEXT;
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# else
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errno = ENOENT;
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return NULL;
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# endif
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} else if (handle == SUDO_DSO_DEFAULT) {
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# ifdef RTLD_DEFAULT
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handle = RTLD_DEFAULT;
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# else
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errno = ENOENT;
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return NULL;
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# endif
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} else if (handle == SUDO_DSO_SELF) {
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# ifdef RTLD_SELF
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handle = RTLD_SELF;
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# else
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errno = ENOENT;
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return NULL;
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# endif
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}
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return dlsym(handle, symbol);
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}
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char *
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sudo_dso_strerror_v1(void)
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{
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return dlerror();
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}
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#else /* !HAVE_SHL_LOAD && !HAVE_DLOPEN */
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/*
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* Emulate dlopen() using a static list of symbols compiled into sudo.
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*/
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void *
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sudo_dso_load_v1(const char *path, int mode)
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{
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struct sudo_preload_table *pt;
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/* Check prelinked symbols first. */
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if (preload_table != NULL) {
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for (pt = preload_table; pt->handle != NULL; pt++) {
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if (pt->path != NULL && strcmp(path, pt->path) == 0)
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return pt->handle;
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}
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}
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return NULL;
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}
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int
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sudo_dso_unload_v1(void *handle)
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{
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struct sudo_preload_table *pt;
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if (preload_table != NULL) {
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for (pt = preload_table; pt->handle != NULL; pt++) {
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if (pt->handle == handle)
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return 0;
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}
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}
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return -1;
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}
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void *
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sudo_dso_findsym_v1(void *handle, const char *symbol)
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{
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struct sudo_preload_table *pt;
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if (preload_table != NULL) {
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for (pt = preload_table; pt->handle != NULL; pt++) {
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if (pt->handle == handle) {
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struct sudo_preload_symbol *sym;
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for (sym = pt->symbols; sym->name != NULL; sym++) {
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if (strcmp(sym->name, symbol) == 0)
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return sym->addr;
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}
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}
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}
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}
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errno = ENOENT;
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return NULL;
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}
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char *
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sudo_dso_strerror_v1(void)
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{
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return strerror(errno);
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}
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#endif /* !HAVE_SHL_LOAD && !HAVE_DLOPEN */
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