| /* |
| * |
| * Copyright (c) International Business Machines Corp., 2001 |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| * the GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| /* |
| * NAME |
| * sysctl03.c |
| * |
| * DESCRIPTION |
| * Testcase to check that sysctl(2) sets errno to EPERM correctly. |
| * |
| * ALGORITHM |
| * a. Call sysctl(2) as a root user, and attempt to write data |
| * to the kernel_table[]. Since the table does not have write |
| * permissions even for the root, it should fail EPERM. |
| * b. Call sysctl(2) as a non-root user, and attempt to write data |
| * to the kernel_table[]. Since the table does not have write |
| * permission for the regular user, it should fail with EPERM. |
| * |
| * NOTE: There is a documentation bug in 2.6.33-rc1 where unfortunately the |
| * behavior of sysctl(2) isn't properly documented, as discussed in detail in |
| * the following thread: |
| * http://sourceforge.net/mailarchive/message.php?msg_name=4B7BA24F.2010705%40linux.vnet.ibm.com. |
| * |
| * The documentation bug is filed as: |
| * https://bugzilla.kernel.org/show_bug.cgi?id=15446 . If you want the message |
| * removed, please ask your fellow kernel maintainer to fix his/her |
| * documentation. |
| * |
| * Thanks! |
| * -Garrett |
| * |
| * USAGE: <for command-line> |
| * sysctl03 [-c n] [-e] [-i n] [-I x] [-P x] [-t] |
| * where, -c n : Run n copies concurrently. |
| * -e : Turn on errno logging. |
| * -i n : Execute test n times. |
| * -I x : Execute test for x seconds. |
| * -P x : Pause for x seconds between iterations. |
| * -t : Turn on syscall timing. |
| * |
| * HISTORY |
| * 07/2001 Ported by Wayne Boyer |
| * 02/2010 Updated by shiwh@cn.fujitsu.com |
| * |
| * RESTRICTIONS |
| * Test must be run as root. |
| */ |
| #include "test.h" |
| #include "usctest.h" |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <stdio.h> |
| #include <errno.h> |
| #include <unistd.h> |
| #include <linux/unistd.h> |
| #include <linux/sysctl.h> |
| #include <pwd.h> |
| |
| char *TCID = "sysctl03"; |
| int TST_TOTAL = 2; |
| extern int Tst_count; |
| |
| int sysctl(int *name, int nlen, void *oldval, size_t * oldlenp, |
| void *newval, size_t newlen) |
| { |
| struct __sysctl_args args = |
| { name, nlen, oldval, oldlenp, newval, newlen }; |
| return syscall(__NR__sysctl, &args); |
| } |
| |
| #define SIZE(x) sizeof(x)/sizeof(x[0]) |
| #define OSNAMESZ 100 |
| |
| void setup(void); |
| void cleanup(void); |
| |
| int exp_enos[] = { EPERM, 0 }; |
| |
| int main(int ac, char **av) |
| { |
| int exp_eno; |
| int lc; |
| char *msg; |
| |
| char osname[OSNAMESZ]; |
| int osnamelth, status; |
| int name[] = { CTL_KERN, KERN_OSTYPE }; |
| pid_t pid; |
| struct passwd *ltpuser; |
| |
| /* parse standard options */ |
| if ((msg = parse_opts(ac, av, NULL, NULL)) != |
| NULL) { |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| } |
| |
| setup(); |
| |
| if ((tst_kvercmp(2, 6, 32)) <= 0) { |
| exp_eno = EPERM; |
| } else { |
| /* ^^ Look above this warning. ^^ */ |
| tst_resm(TWARN, "this test's results are based on potentially undocumented behavior in the kernel. read the NOTE in the source file for more details"); |
| exp_eno = EACCES; |
| exp_enos[0] = EACCES; |
| } |
| |
| TEST_EXP_ENOS(exp_enos); |
| |
| /* check looping state if -i option is given */ |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| |
| /* reset Tst_count in case we are looping */ |
| Tst_count = 0; |
| |
| strcpy(osname, "Linux"); |
| osnamelth = SIZE(osname); |
| |
| TEST(sysctl(name, SIZE(name), 0, 0, osname, osnamelth)); |
| |
| if (TEST_RETURN != -1) { |
| tst_resm(TFAIL, "sysctl(2) succeeded unexpectedly"); |
| } else { |
| TEST_ERROR_LOG(TEST_ERRNO); |
| |
| if (TEST_ERRNO == exp_eno) { |
| tst_resm(TPASS|TTERRNO, "Got expected error"); |
| } else { |
| tst_resm(TFAIL|TTERRNO, "Got unexpected error"); |
| } |
| } |
| |
| osnamelth = SIZE(osname); |
| if ((ltpuser = getpwnam("nobody")) == NULL) { |
| tst_brkm(TBROK, cleanup, "getpwnam() failed"); |
| } |
| |
| /* set process ID to "ltpuser1" */ |
| if (seteuid(ltpuser->pw_uid) == -1) { |
| tst_brkm(TBROK, cleanup, |
| "seteuid() failed, errno %d", errno); |
| } |
| |
| if ((pid = FORK_OR_VFORK()) == -1) { |
| tst_brkm(TBROK, cleanup, "fork() failed"); |
| } |
| |
| if (pid == 0) { /* child */ |
| TEST(sysctl(name, SIZE(name), 0, 0, osname, osnamelth)); |
| |
| if (TEST_RETURN != -1) { |
| tst_resm(TFAIL, "call succeeded unexpectedly"); |
| } else { |
| TEST_ERROR_LOG(TEST_ERRNO); |
| |
| if (TEST_ERRNO == exp_eno) { |
| tst_resm(TPASS|TTERRNO, |
| "Got expected error"); |
| } else { |
| tst_resm(TFAIL|TTERRNO, |
| "Got unexpected error"); |
| } |
| } |
| |
| cleanup(); |
| |
| } else { /* parent */ |
| /* wait for the child to finish */ |
| wait(&status); |
| } |
| |
| /* set process ID back to root */ |
| if (seteuid(0) == -1) { |
| tst_brkm(TBROK, cleanup, "seteuid() failed"); |
| } |
| } |
| cleanup(); |
| |
| /*NOTREACHED*/ return 0; |
| } |
| |
| /* |
| * setup() - performs all ONE TIME setup for this test. |
| */ |
| void setup() |
| { |
| /* test must be run as root */ |
| if (geteuid() != 0) { |
| tst_brkm(TBROK, tst_exit, "Test must be run as root"); |
| } |
| |
| /* capture signals */ |
| tst_sig(FORK, DEF_HANDLER, cleanup); |
| |
| /* Pause if that option was specified */ |
| TEST_PAUSE; |
| } |
| |
| /* |
| * cleanup() - performs all ONE TIME cleanup for this test at |
| * completion or premature exit. |
| */ |
| void cleanup() |
| { |
| /* |
| * print timing stats if that option was specified. |
| * print errno log if that option was specified. |
| */ |
| TEST_CLEANUP; |
| |
| /* exit with return code appropriate for results */ |
| tst_exit(); |
| } |