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      1 /*
      2  * Copyright (c) Wipro Technologies Ltd, 2002.  All Rights Reserved.
      3  *
      4  * This program is free software; you can redistribute it and/or modify it
      5  * 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  * You should have received a copy of the GNU General Public License along
     13  * with this program; if not, write the Free Software Foundation, Inc.,
     14  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
     15  *
     16  */
     17 
     18 /*
     19  *    AUTHOR: Madhu T L <madhu.tarikere (at) wipro.com>
     20  *
     21  *    DESCRIPTION
     22  *      Verify that,
     23  *      1. delete_module(2) returns -1 and sets errno to ENOENT for nonexistent
     24  *	   module entry.
     25  *      2. delete_module(2) returns -1 and sets errno to EFAULT, if
     26  *         module name parameter is outside program's accessible address space.
     27  *      3. delete_module(2) returns -1 and sets errno to EPERM, if effective
     28  *         user id of the caller is not superuser.
     29  */
     30 
     31 #include <errno.h>
     32 #include <pwd.h>
     33 #include <sys/types.h>
     34 #include <unistd.h>
     35 #include <limits.h>
     36 #if HAVE_LINUX_MODULE_H
     37 #include <linux/module.h>
     38 #else
     39 /* As per http://tomoyo.sourceforge.jp/cgi-bin/lxr/source/include/linux/moduleparam.h?a=ppc#L17 ... */
     40 #define MODULE_NAME_LEN	( 64 - sizeof(unsigned long) )
     41 #endif
     42 #include <sys/mman.h>
     43 #include "test.h"
     44 #include "safe_macros.h"
     45 #include "linux_syscall_numbers.h"
     46 
     47 #define NULLMODNAME	""
     48 #define BASEMODNAME	"dummy"
     49 #define LONGMODNAMECHAR	'm'	/* Arbitrarily selected */
     50 
     51 char *TCID = "delete_module02";
     52 
     53 static char nobody_uid[] = "nobody";
     54 struct passwd *ltpuser;
     55 static char longmodname[MODULE_NAME_LEN];
     56 static char modname[20];
     57 
     58 static void setup(void);
     59 static void cleanup(void);
     60 static void setup1(void);
     61 static void cleanup1(void);
     62 
     63 static struct test_case_t {
     64 	char *modname;
     65 	int experrno;
     66 	char *desc;
     67 	void (*setup) (void);
     68 	void (*cleanup) (void);
     69 } tdat[] = {
     70 	{ modname, ENOENT, "nonexistent module", NULL, NULL},
     71 	{ NULLMODNAME, ENOENT, "null terminated module name", NULL, NULL},
     72 	{ (char *)-1, EFAULT, "module name outside program's "
     73 	  "accessible address space", NULL, NULL},
     74 	{ longmodname, ENOENT, "long module name", NULL, NULL},
     75 	{ modname, EPERM, "non-superuser", setup1, cleanup1},
     76 };
     77 
     78 int TST_TOTAL = ARRAY_SIZE(tdat);
     79 
     80 int main(int argc, char **argv)
     81 {
     82 	int lc;
     83 	int i;
     84 
     85 	tst_parse_opts(argc, argv, NULL, NULL);
     86 
     87 	setup();
     88 
     89 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     90 		tst_count = 0;
     91 
     92 		for (i = 0; i < TST_TOTAL; ++i) {
     93 			if (tdat[i].setup)
     94 				tdat[i].setup();
     95 
     96 			tst_resm(TINFO, "test %s", tdat[i].desc);
     97 			TEST(ltp_syscall(__NR_delete_module,
     98 			     tdat[i].modname, 0));
     99 
    100 			if (TEST_RETURN != -1) {
    101 				tst_resm(TFAIL, "delete_module() "
    102 					 "succeeded unexpectedly");
    103 			} else if (TEST_ERRNO == tdat[i].experrno) {
    104 				tst_resm(TPASS | TTERRNO,
    105 					 "delete_module() failed as expected");
    106 			} else {
    107 				tst_resm(TFAIL | TTERRNO, "delete_module() "
    108 					 "failed unexpectedly; expected: "
    109 					 "%d - %s", tdat[i].experrno,
    110 					 strerror(tdat[i].experrno));
    111 			}
    112 			if (tdat[i].cleanup)
    113 				tdat[i].cleanup();
    114 		}
    115 	}
    116 
    117 	cleanup();
    118 	tst_exit();
    119 }
    120 
    121 static void setup1(void)
    122 {
    123 	SAFE_SETEUID(cleanup, ltpuser->pw_uid);
    124 }
    125 
    126 static void cleanup1(void)
    127 {
    128 	SAFE_SETEUID(cleanup, 0);
    129 }
    130 
    131 static void setup(void)
    132 {
    133 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
    134 
    135 	tst_require_root();
    136 
    137 	ltpuser = SAFE_GETPWNAM(cleanup, nobody_uid);
    138 
    139 	TEST_PAUSE;
    140 
    141 	/* Initialize longmodname to LONGMODNAMECHAR character */
    142 	memset(longmodname, LONGMODNAMECHAR, MODULE_NAME_LEN - 1);
    143 
    144 	/* Get unique module name for each child process */
    145 	if (sprintf(modname, "%s_%d", BASEMODNAME, getpid()) <= 0)
    146 		tst_brkm(TBROK, NULL, "Failed to initialize module name");
    147 
    148 	tdat[2].modname = SAFE_MMAP(cleanup, 0, 1, PROT_NONE,
    149 				    MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
    150 }
    151 
    152 void cleanup(void)
    153 {
    154 }
    155