d36d37fc6a
Reported by clang-analyzer. After reading the linux man-pages vfork(2) manpage I came to the conclusion that it's better to change the behaviour of the original source (NetBSD) and change this to use fork(2).
140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
/*-
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* Copyright (c) 2003 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matthias Scheler.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#define _BSD_SOURCE /* for vfork and chroot */
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#define _DEFAULT_SOURCE /* glibc>=2.20 */
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#include <sys/types.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#undef _DEFAULT_SOURCE
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#undef _BSD_SOURCE
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#include "xbps_api_impl.h"
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static int
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pfcexec(struct xbps_handle *xhp, const char *file, const char **argv)
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{
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pid_t child;
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int status;
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child = fork();
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switch (child) {
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case 0:
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/*
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* If rootdir != / and uid==0 and bin/sh exists,
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* change root directory and exec command.
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*/
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if (strcmp(xhp->rootdir, "/")) {
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if ((geteuid() == 0) && (access("bin/sh", X_OK) == 0)) {
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if (chroot(xhp->rootdir) == -1) {
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xbps_dbg_printf(xhp, "%s: chroot() "
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"failed: %s\n", *argv, strerror(errno));
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_exit(errno);
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}
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if (chdir("/") == -1) {
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xbps_dbg_printf(xhp, "%s: chdir() "
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"failed: %s\n", *argv, strerror(errno));
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_exit(errno);
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}
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}
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}
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umask(022);
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(void)execv(file, __UNCONST(argv));
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_exit(errno);
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/* NOTREACHED */
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case -1:
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return -1;
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}
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while (waitpid(child, &status, 0) < 0) {
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if (errno != EINTR)
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return -1;
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}
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if (!WIFEXITED(status))
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return -1;
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return WEXITSTATUS(status);
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}
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static int
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vfcexec(struct xbps_handle *xhp, const char *arg, va_list ap)
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{
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const char **argv;
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size_t argv_size, argc;
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int retval;
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argv_size = 16;
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if ((argv = malloc(argv_size * sizeof(*argv))) == NULL) {
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errno = ENOMEM;
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return -1;
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}
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argv[0] = arg;
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argc = 1;
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do {
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if (argc == argv_size) {
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argv_size *= 2;
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argv = realloc(argv, argv_size * sizeof(*argv));
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if (argv == NULL) {
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errno = ENOMEM;
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return -1;
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}
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}
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arg = va_arg(ap, const char *);
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argv[argc++] = arg;
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} while (arg != NULL);
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retval = pfcexec(xhp, argv[0], argv);
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free(argv);
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return retval;
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}
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int HIDDEN
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xbps_file_exec(struct xbps_handle *xhp, const char *arg, ...)
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{
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va_list ap;
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int result;
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va_start(ap, arg);
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result = vfcexec(xhp, arg, ap);
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va_end(ap);
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return result;
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}
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