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155 lines
3.7 KiB
155 lines
3.7 KiB
/*
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* Copyright (c) International Business Machines Corp., 2004
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* Copyright (c) Linux Test Project, 2004-2017
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*/
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/*
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* DESCRIPTION
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* hugeshmctl03 - check for EACCES, and EPERM errors
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*
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* ALGORITHM
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* create a large shared memory segment with root only read & write
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* permissions fork a child process
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* if child
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* set the ID of the child process to that of "ltpuser1"
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* call do_child()
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* loop if that option was specified
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* call shmctl() using three different invalid cases
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* check the errno value
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* issue a PASS message if we get EACCES or EPERM
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* otherwise, the tests fails
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* issue a FAIL message
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* call cleanup
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* if parent
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* wait for child to exit
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* remove the large shared memory segment
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*
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* HISTORY
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* 03/2001 - Written by Wayne Boyer
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* 04/2004 - Updated by Robbie Williamson
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*
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* RESTRICTIONS
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* test must be run as root
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*/
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <limits.h>
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#include "hugetlb.h"
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static size_t shm_size;
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static int shm_id_1 = -1;
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static struct shmid_ds buf;
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static uid_t ltp_uid;
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static char *ltp_user = "nobody";
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static long hugepages = 128;
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static struct tst_option options[] = {
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{"s:", &nr_opt, "-s num Set the number of the been allocated hugepages"},
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{NULL, NULL, NULL}
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};
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struct tcase {
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int *shmid;
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int cmd;
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struct shmid_ds *sbuf;
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int error;
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} tcases[] = {
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/* EACCES - child has no read permission for segment */
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{&shm_id_1, IPC_STAT, &buf, EACCES},
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/* EPERM - IPC_SET - child doesn't have permission to change segment */
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{&shm_id_1, IPC_SET, &buf, EPERM},
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/* EPERM - IPC_RMID - child can not remove the segment */
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{&shm_id_1, IPC_RMID, &buf, EPERM},
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};
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static void do_child(void);
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static void test_hugeshmctl(void)
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{
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pid_t pid;
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int status;
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switch (pid = SAFE_FORK()) {
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case 0:
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/* set the user ID of the child to the non root user */
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SAFE_SETUID(ltp_uid);
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do_child();
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exit(0);
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default:
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SAFE_WAITPID(pid, &status, 0);
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}
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}
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static void do_child(void)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(tcases); i++) {
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TEST(shmctl(*(tcases[i].shmid), tcases[i].cmd, tcases[i].sbuf));
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if (TST_RET != -1) {
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tst_res(TFAIL, "shmctl succeeded "
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"unexpectedly");
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continue;
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}
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if (TST_ERR == tcases[i].error)
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tst_res(TPASS | TTERRNO, "shmctl failed "
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"as expected");
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else
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tst_res(TFAIL | TTERRNO, "shmctl failed "
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"unexpectedly - expect errno = "
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"%d, got", tcases[i].error);
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}
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}
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void setup(void)
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{
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long hpage_size;
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save_nr_hugepages();
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if (nr_opt)
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hugepages = SAFE_STRTOL(nr_opt, 0, LONG_MAX);
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limit_hugepages(&hugepages);
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set_sys_tune("nr_hugepages", hugepages, 1);
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hpage_size = SAFE_READ_MEMINFO("Hugepagesize:") * 1024;
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shm_size = hpage_size * hugepages / 2;
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update_shm_size(&shm_size);
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shmkey = getipckey();
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shm_id_1 = shmget(shmkey, shm_size,
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SHM_HUGETLB | IPC_CREAT | IPC_EXCL | SHM_RW);
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if (shm_id_1 == -1)
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tst_brk(TBROK | TERRNO, "shmget");
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/* get the userid for a non root user */
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ltp_uid = getuserid(ltp_user);
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}
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void cleanup(void)
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{
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rm_shm(shm_id_1);
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restore_nr_hugepages();
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}
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static struct tst_test test = {
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.needs_root = 1,
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.forks_child = 1,
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.needs_tmpdir = 1,
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.options = options,
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.setup = setup,
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.cleanup = cleanup,
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.test_all = test_hugeshmctl,
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};
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