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      1 /*
      2  * Copyright (C) 2010  Red Hat, Inc.
      3  *
      4  * This program is free software; you can redistribute it and/or modify
      5  * it under the terms of version 2 of the GNU General Public License as
      6  * published by the Free Software Foundation.
      7  *
      8  * This program is distributed in the hope that it would be useful, but
      9  * WITHOUT ANY WARRANTY; without even the implied warranty of
     10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
     11  *
     12  * Further, this software is distributed without any warranty that it is
     13  * free of the rightful claim of any third person regarding infringement
     14  * or the like.  Any license provided herein, whether implied or
     15  * otherwise, applies only to this software file.  Patent licenses, if
     16  * any, provided herein do not apply to combinations of this program
     17  * with other software, or any other product whatsoever.
     18  *
     19  * You should have received a copy of the GNU General Public License
     20  * along with this program; if not, write the Free Software Foundation,
     21  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
     22  */
     23 /*
     24  * munmap() don't check sysctl_max_mapcount
     25  *
     26  * From http://lkml.org/lkml/2009/10/2/85:
     27  *
     28  * On ia64, the following test program exit abnormally, because glibc
     29  * thread library called abort().
     30  *
     31  *  ========================================================
     32  *  (gdb) bt
     33  *  #0  0xa000000000010620 in __kernel_syscall_via_break ()
     34  *  #1  0x20000000003208e0 in raise () from /lib/libc.so.6.1
     35  *  #2  0x2000000000324090 in abort () from /lib/libc.so.6.1
     36  *  #3  0x200000000027c3e0 in __deallocate_stack () from
     37  *      /lib/libpthread.so.0
     38  *  #4  0x200000000027f7c0 in start_thread () from /lib/libpthread.so.0
     39  *  #5  0x200000000047ef60 in __clone2 () from /lib/libc.so.6.1
     40  *  ========================================================
     41  * The fact is, glibc call munmap() when thread exitng time for freeing
     42  * stack, and it assume munlock() never fail. However, munmap() often
     43  * make vma splitting and it with many mapcount make -ENOMEM.
     44  *
     45  * Oh well, stack unfreeing is not reasonable option. Also munlock() via
     46  * free() shouldn't failed.
     47  *
     48  * Thus, munmap() shoudn't check max-mapcount.
     49  */
     50 #include<stdio.h>
     51 #include<stdlib.h>
     52 #include<string.h>
     53 #include<pthread.h>
     54 #include<errno.h>
     55 #include<unistd.h>
     56 #include "test.h"
     57 
     58 char *TCID = "mmap11";
     59 int TST_TOTAL = 1;
     60 
     61 #define MAL_SIZE (100*1024)
     62 
     63 static void *wait_thread(void *args);
     64 static void *wait_thread2(void *args);
     65 static void setup(void);
     66 static void cleanup(void);
     67 static void check(void);
     68 
     69 int main(int argc, char *argv[])
     70 {
     71 
     72 	tst_parse_opts(argc, argv, NULL, NULL);
     73 	setup();
     74 	check();
     75 	cleanup();
     76 	tst_exit();
     77 }
     78 
     79 void setup(void)
     80 {
     81 	tst_require_root();
     82 
     83 	tst_sig(FORK, DEF_HANDLER, cleanup);
     84 	TEST_PAUSE;
     85 }
     86 
     87 void cleanup(void)
     88 {
     89 }
     90 
     91 void check(void)
     92 {
     93 	int lc;
     94 	pthread_t *thread, th;
     95 	int ret, count = 0;
     96 	pthread_attr_t attr;
     97 
     98 	ret = pthread_attr_init(&attr);
     99 	if (ret)
    100 		tst_brkm(TBROK | TERRNO, cleanup, "pthread_attr_init");
    101 	ret = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
    102 	if (ret)
    103 		tst_brkm(TBROK | TERRNO, cleanup,
    104 			 "pthread_attr_setdetachstate");
    105 	thread = malloc(STD_LOOP_COUNT * sizeof(pthread_t));
    106 	if (thread == NULL)
    107 		tst_brkm(TBROK | TERRNO, cleanup, "malloc");
    108 
    109 	for (lc = 0; TEST_LOOPING(lc); lc++) {
    110 		tst_count = 0;
    111 		ret = pthread_create(&th, &attr, wait_thread, NULL);
    112 		if (ret) {
    113 			tst_resm(TINFO, "[%d] ", count);
    114 			tst_brkm(TBROK | TERRNO, cleanup, "pthread_create");
    115 		}
    116 		count++;
    117 		ret = pthread_create(&thread[lc], &attr, wait_thread2, NULL);
    118 		if (ret) {
    119 			tst_resm(TINFO, "[%d] ", count);
    120 			tst_brkm(TBROK | TERRNO, cleanup, "pthread_create");
    121 		}
    122 		count++;
    123 	}
    124 	tst_resm(TPASS, "test completed.");
    125 	free(thread);
    126 }
    127 
    128 void *wait_thread(void *args)
    129 {
    130 	void *addr;
    131 
    132 	addr = malloc(MAL_SIZE);
    133 	if (addr)
    134 		memset(addr, 1, MAL_SIZE);
    135 	sleep(1);
    136 	return NULL;
    137 }
    138 
    139 void *wait_thread2(void *args)
    140 {
    141 	return NULL;
    142 }
    143