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      1 /*
      2  *  This program is free software; you can redistribute it and/or modify
      3  *  it under the terms of the GNU General Public License version 2.
      4  *
      5  *  This program is distributed in the hope that it will be useful,
      6  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
      7  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      8  *  GNU General Public License for more details.
      9  *
     10  * Test that the shm_open() function sets errno = EACCES if the shared memory
     11  * object exists and the permissions specified by oflag are denied
     12  *
     13  * Create a shared memory object with no read or write permission and try to
     14  * open it.
     15  */
     16 
     17 #define _XOPEN_SOURCE 600
     18 #include <stdio.h>
     19 #include <sys/mman.h>
     20 #include <sys/stat.h>
     21 #include <fcntl.h>
     22 #include <errno.h>
     23 #include <unistd.h>
     24 #include <sys/types.h>
     25 #include <pwd.h>
     26 #include <string.h>
     27 #include "posixtest.h"
     28 
     29 #define SHM_NAME "posixtest_32-1"
     30 
     31 /** Set the euid of this process to a non-root uid */
     32 int set_nonroot()
     33 {
     34 	struct passwd *pw;
     35 	setpwent();
     36 	/* search for the first user which is non root */
     37 	while ((pw = getpwent()) != NULL)
     38 		if (strcmp(pw->pw_name, "root"))
     39 			break;
     40 	endpwent();
     41 	if (pw == NULL) {
     42 		printf("There is no other user than current and root.\n");
     43 		return 1;
     44 	}
     45 
     46 	if (seteuid(pw->pw_uid) != 0) {
     47 		if (errno == EPERM) {
     48 			printf
     49 			    ("You don't have permission to change your UID.\n");
     50 			return 1;
     51 		}
     52 		perror("An error occurs when calling seteuid()");
     53 		return 1;
     54 	}
     55 
     56 	printf("Testing with user '%s' (uid: %d)\n",
     57 	       pw->pw_name, (int)geteuid());
     58 	return 0;
     59 }
     60 
     61 int main(void)
     62 {
     63 	int fd;
     64 
     65 	/* This test should be run under standard user permissions */
     66 	if (getuid() == 0) {
     67 		if (set_nonroot() != 0) {
     68 			printf("Cannot run this test as non-root user\n");
     69 			return PTS_UNTESTED;
     70 		}
     71 	}
     72 
     73 	fd = shm_open(SHM_NAME, O_RDWR | O_CREAT, 0);
     74 	if (fd == -1) {
     75 		perror("An error occurs when calling shm_open()");
     76 		return PTS_UNRESOLVED;
     77 	}
     78 
     79 	fd = shm_open(SHM_NAME, O_RDWR, 0);
     80 
     81 	if (fd == -1 && errno == EACCES) {
     82 		printf("Test PASSED\n");
     83 		shm_unlink(SHM_NAME);
     84 		return PTS_PASS;
     85 	} else if (fd != -1) {
     86 		printf("shm_open success.\n");
     87 		shm_unlink(SHM_NAME);
     88 		return PTS_FAIL;
     89 	}
     90 
     91 	perror("shm_open");
     92 	return PTS_FAIL;
     93 }
     94