diff options
Diffstat (limited to 'tools/regression/priv/priv_sched_setpriority.c')
| -rw-r--r-- | tools/regression/priv/priv_sched_setpriority.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/tools/regression/priv/priv_sched_setpriority.c b/tools/regression/priv/priv_sched_setpriority.c new file mode 100644 index 0000000..4d56813 --- /dev/null +++ b/tools/regression/priv/priv_sched_setpriority.c @@ -0,0 +1,163 @@ +/*- + * Copyright (c) 2006 nCircle Network Security, Inc. + * All rights reserved. + * + * This software was developed by Robert N. M. Watson for the TrustedBSD + * Project under contract to nCircle Network Security, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY, + * INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED + * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * $FreeBSD$ + */ + +/* + * Test that privilege is required to lower nice value; first test with, then + * without. There are two failure modes associated with privilege: the right + * to renice a process with a different uid, and the right to renice to a + * lower priority. Because both the real and effective uid are part of the + * permissions test, we have to create two children processes with different + * uids. + */ + +#include <sys/types.h> +#include <sys/resource.h> +#include <sys/wait.h> + +#include <err.h> +#include <errno.h> +#include <signal.h> +#include <stdlib.h> +#include <unistd.h> + +#include "main.h" + +static void +dummy(void) +{ + + while (1) + sleep(1); +} + +static void +collect(pid_t test_pid, pid_t dummy_pid) +{ + pid_t pid; + + /* + * First, collect the main test process. When it has exited, then + * kill off the dummy process. + */ + if (test_pid > 0) { + while (1) { + pid = waitpid(test_pid, NULL, 0); + if (pid == -1) + warn("waitpid(%d (test), NULL, 0)", test_pid); + if (pid == test_pid) + break; + } + } + + if (kill(dummy_pid, SIGKILL) < 0) + err(-1, "kill(%d, SIGKILL)", dummy_pid); + + while (1) { + pid = waitpid(dummy_pid, NULL, 0); + if (pid == -1) + warn("waitpid(%d, NULL, 0)", dummy_pid); + if (pid == dummy_pid) + return; + } +} + +static void +test(pid_t dummy_pid) +{ + int error; + + /* + * Tests first as root. + */ + if (setpriority(PRIO_PROCESS, 0, -1) < 0) + err(-1, "setpriority(PRIO_PROCESS, 0, -1) as root"); + + if (setpriority(PRIO_PROCESS, dummy_pid, -1) < 0) + err(-1, "setpriority(PRIO_PROCESS, %d, -1) as root", + dummy_pid); + + /* + * Then test again as a different credential. + */ + if (setresuid(UID_OTHER, UID_OTHER, UID_OTHER) < 0) + err(-1, "setresuid(%d)", UID_OTHER); + + error = setpriority(PRIO_PROCESS, 0, -2); + if (error == 0) + errx(-1, + "setpriority(PRIO_PROCESS, 0, -2) succeeded as !root"); + if (errno != EACCES) + err(-1, "setpriority(PRIO_PROCESS, 0, 2) wrong errno %d as " + "!root", errno); + + error = setpriority(PRIO_PROCESS, dummy_pid, -2); + if (error == 0) + errx(-1, + "setpriority(PRIO_PROCESS, %d, -2) succeeded as !root", + dummy_pid); + if (errno != EPERM) + err(-1, "setpriority(PRIO_PROCESS, %d, 2) wrong errno %d as " + "!root", dummy_pid, errno); + + exit(0); +} + +void +priv_sched_setpriority(void) +{ + pid_t dummy_pid, test_pid; + + assert_root(); + + /* + * Set up dummy process, which we will kill before exiting. + */ + dummy_pid = fork(); + if (dummy_pid < 0) + err(-1, "fork - dummy"); + if (dummy_pid == 0) { + if (setresuid(UID_THIRD, UID_THIRD, UID_THIRD) < 0) + err(-1, "setresuid(%d)", UID_THIRD); + dummy(); + } + sleep(1); /* Allow dummy thread to change uids. */ + + test_pid = fork(); + if (test_pid < 0) { + warn("fork - test"); + collect(-1, dummy_pid); + return; + } + if (test_pid == 0) + test(dummy_pid); + + collect(test_pid, dummy_pid); +} |
