97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) Wipro Technologies Ltd, 2002. All Rights Reserved.
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* Copyright (c) 2018 Xiao Yang <yangx.jy@cn.fujitsu.com>
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*/
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/*
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* AUTHOR: Madhu T L <madhu.tarikere@wipro.com>
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*
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* DESCRIPTION
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* Verify that,
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* 1. delete_module(2) returns -1 and sets errno to ENOENT for nonexistent
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* module entry.
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* 2. delete_module(2) returns -1 and sets errno to EFAULT, if
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* module name parameter is outside program's accessible address space.
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* 3. delete_module(2) returns -1 and sets errno to EPERM, if effective
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* user id of the caller is not superuser.
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*/
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#include <errno.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <string.h>
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#include "tst_test.h"
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#include "lapi/syscalls.h"
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#define BASEMODNAME "dummy"
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#define LONGMODNAMECHAR 'm'
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/*
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* From kernel internal headers: include/linux/module.h
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* include/linux/moduleparam.h
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*/
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#define MODULE_NAME_LEN (64 - sizeof(unsigned long))
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static struct passwd *ltpuser;
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static char longmodname[MODULE_NAME_LEN];
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static char modname[20];
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static struct test_case_t {
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char *modname;
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int experrno;
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char *desc;
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/* 1: nobody_user 0: root_user */
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int nobody_user;
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} tdat[] = {
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{ modname, ENOENT, "nonexistent module", 0},
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{ "", ENOENT, "null terminated module name", 0},
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{ NULL, EFAULT, "module name outside program's accessible address space", 0},
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{ longmodname, ENOENT, "long module name", 0},
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{ modname, EPERM, "non-superuser", 1},
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};
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static void do_delete_module(unsigned int n)
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{
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struct test_case_t *tc = &tdat[n];
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if (!tc->modname)
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tc->modname = tst_get_bad_addr(NULL);
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if (tc->nobody_user)
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SAFE_SETEUID(ltpuser->pw_uid);
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tst_res(TINFO, "test %s", tc->desc);
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TEST(tst_syscall(__NR_delete_module, tc->modname, 0));
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if (TST_RET != -1) {
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tst_res(TFAIL, "delete_module() succeeded unexpectedly");
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} else if (TST_ERR == tc->experrno) {
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tst_res(TPASS | TTERRNO, "delete_module() failed as expected");
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} else {
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tst_res(TFAIL | TTERRNO, "delete_module() failed unexpectedly;"
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" expected: %s", tst_strerrno(tc->experrno));
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}
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if (tc->nobody_user)
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SAFE_SETEUID(0);
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}
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static void setup(void)
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{
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ltpuser = SAFE_GETPWNAM("nobody");
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/* Initialize longmodname to LONGMODNAMECHAR character */
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memset(longmodname, LONGMODNAMECHAR, MODULE_NAME_LEN - 1);
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/* Get unique module name for each child process */
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sprintf(modname, "%s_%d", BASEMODNAME, getpid());
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}
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static struct tst_test test = {
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.tcnt = ARRAY_SIZE(tdat),
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.needs_root = 1,
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.setup = setup,
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.test = do_delete_module,
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};
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