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      1 /*
      2  * Copyright (c) International Business Machines  Corp., 2001
      3  * Copyright (c) 2015 Cyril Hrubis <chrubis (at) suse.cz>
      4  *
      5  *  07/2001 Ported by Wayne Boyer
      6  *  21/04/2008 Renaud Lottiaux (Renaud.Lottiaux (at) kerlabs.com)
      7  *
      8  * This program is free software;  you can redistribute it and/or modify
      9  * it under the terms of the GNU General Public License as published by
     10  * the Free Software Foundation; either version 2 of the License, or
     11  * (at your option) any later version.
     12  *
     13  * This program is distributed in the hope that it will be useful,
     14  * but WITHOUT ANY WARRANTY;  without even the implied warranty of
     15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
     16  * the GNU General Public License for more details.
     17  *
     18  * You should have received a copy of the GNU General Public License
     19  * along with this program;  if not, write to the Free Software Foundation,
     20  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
     21  */
     22 
     23 /*
     24  * Attempt to execve(2) an executable owned by root with no execute permissions
     25  * for the other users, fails when execve(2) is used as a non-root user, the
     26  * errno should be EACCES.
     27  */
     28 
     29 #ifndef _GNU_SOURCE
     30 #define _GNU_SOURCE
     31 #endif
     32 #include <sys/types.h>
     33 #include <sys/stat.h>
     34 #include <sys/wait.h>
     35 #include <errno.h>
     36 #include <libgen.h>
     37 #include <pwd.h>
     38 #include <stdio.h>
     39 #include <string.h>
     40 #include <unistd.h>
     41 
     42 #include "test.h"
     43 #include "safe_macros.h"
     44 
     45 char *TCID = "execve02";
     46 int TST_TOTAL = 1;
     47 
     48 #define TEST_APP "execve_child"
     49 #define USER_NAME "nobody"
     50 
     51 static void setup(void);
     52 static void cleanup(void);
     53 
     54 static uid_t nobody_uid;
     55 
     56 static void do_child(void)
     57 {
     58 	char *argv[2] = {TEST_APP, NULL};
     59 
     60 	SAFE_SETEUID(NULL, nobody_uid);
     61 
     62 	TEST(execve(TEST_APP, argv, NULL));
     63 
     64 	if (!TEST_RETURN)
     65 		tst_brkm(TFAIL, NULL, "execve() passed unexpectedly");
     66 
     67 	if (TEST_ERRNO != EACCES) {
     68 		tst_brkm(TFAIL | TTERRNO, NULL,
     69 		         "execve() failed unexpectedly");
     70 	}
     71 
     72 	tst_resm(TPASS | TTERRNO, "execve() failed expectedly");
     73 	tst_exit();
     74 }
     75 
     76 int main(int ac, char **av)
     77 {
     78 	int lc;
     79 	pid_t pid;
     80 
     81 	tst_parse_opts(ac, av, NULL, NULL);
     82 
     83 	setup();
     84 
     85 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     86 
     87 		if ((pid = FORK_OR_VFORK()) == -1)
     88 			tst_brkm(TBROK | TERRNO, cleanup, "fork failed");
     89 
     90 		if (pid == 0)
     91 			do_child();
     92 
     93 		tst_record_childstatus(cleanup, pid);
     94 	}
     95 
     96 	cleanup();
     97 	tst_exit();
     98 }
     99 
    100 static void setup(void)
    101 {
    102 	char path[PATH_MAX];
    103 	struct passwd *pwd;
    104 
    105 	tst_require_root();
    106 
    107 	if (tst_get_path(TEST_APP, path, sizeof(path))) {
    108 		tst_brkm(TBROK, NULL,
    109 		         "Couldn't found "TEST_APP" binary in $PATH");
    110 	}
    111 
    112 	tst_tmpdir();
    113 
    114 	SAFE_CP(tst_rmdir, path, ".");
    115 	SAFE_CHMOD(cleanup, TEST_APP, 0700);
    116 
    117 	pwd = SAFE_GETPWNAM(tst_rmdir, USER_NAME);
    118 	nobody_uid = pwd->pw_uid;
    119 }
    120 
    121 void cleanup(void)
    122 {
    123 	tst_rmdir();
    124 }
    125