164 lines
3.7 KiB
C
164 lines
3.7 KiB
C
/*
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* Copyright (c) International Business Machines Corp., 2001
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* DESCRIPTION
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* Testcase to check the error conditions for mprotect(2)
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*
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* ALGORITHM
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* test1:
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* Invoke mprotect() with an address of 0. Check if error
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* is set to ENOMEM.
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* test2:
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* Invoke mprotect() with an address that is not a multiple
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* of PAGESIZE. EINVAL
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* test3:
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* Mmap a file with only read permission (PROT_READ).
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* Try to set write permission (PROT_WRITE) using mprotect(2).
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* Check that error is set to EACCES.
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*
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* HISTORY
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* 07/2001 Ported by Wayne Boyer
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* 03/2002 Paul Larson: case 1 should expect ENOMEM not EFAULT
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*/
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/mman.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "test.h"
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#include "safe_macros.h"
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char *TCID = "mprotect01";
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int TST_TOTAL = 3;
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struct test_case {
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void *addr;
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int len;
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int prot;
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int error;
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void (*setupfunc) (struct test_case *self);
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};
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static void cleanup(void);
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static void setup(void);
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static void setup1(struct test_case *self);
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static void setup2(struct test_case *self);
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static void setup3(struct test_case *self);
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static int fd;
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struct test_case TC[] = {
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/* Check for ENOMEM passing memory that cannot be accessed. */
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{NULL, 0, PROT_READ, ENOMEM, setup1},
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/*
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* Check for EINVAL by passing a pointer which is not a
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* multiple of PAGESIZE.
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*/
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{NULL, 1024, PROT_READ, EINVAL, setup2},
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/*
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* Check for EACCES by trying to mark a section of memory
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* which has been mmap'ed as read-only, as PROT_WRITE
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*/
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{NULL, 0, PROT_WRITE, EACCES, setup3}
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};
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int main(int ac, char **av)
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{
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int lc;
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int i;
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tst_parse_opts(ac, av, NULL, NULL);
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setup();
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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tst_count = 0;
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for (i = 0; i < TST_TOTAL; i++) {
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if (TC[i].setupfunc != NULL)
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TC[i].setupfunc(&TC[i]);
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TEST(mprotect(TC[i].addr, TC[i].len, TC[i].prot));
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if (TEST_RETURN != -1) {
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tst_resm(TFAIL, "call succeeded unexpectedly");
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continue;
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}
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if (TEST_ERRNO == TC[i].error) {
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tst_resm(TPASS, "expected failure - "
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"errno = %d : %s", TEST_ERRNO,
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strerror(TEST_ERRNO));
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} else {
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tst_resm(TFAIL, "unexpected error - %d : %s - "
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"expected %d", TEST_ERRNO,
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strerror(TEST_ERRNO), TC[i].error);
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}
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}
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}
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cleanup();
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tst_exit();
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}
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static void setup1(struct test_case *self)
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{
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self->len = getpagesize() + 1;
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}
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static void setup2(struct test_case *self)
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{
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self->addr = malloc(getpagesize());
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if (self->addr == NULL)
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tst_brkm(TINFO, cleanup, "malloc failed");
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/* Ensure addr2 is not page aligned */
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self->addr++;
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}
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static void setup3(struct test_case *self)
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{
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fd = SAFE_OPEN(cleanup, "/dev/zero", O_RDONLY);
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self->len = getpagesize();
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/*
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* mmap the PAGESIZE bytes as read only.
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*/
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self->addr = mmap(0, self->len, PROT_READ, MAP_SHARED, fd, 0);
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if (self->addr == MAP_FAILED)
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tst_brkm(TBROK, cleanup, "mmap failed");
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}
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static void setup(void)
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{
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tst_sig(FORK, DEF_HANDLER, cleanup);
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TEST_PAUSE;
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}
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static void cleanup(void)
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{
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close(fd);
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}
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