80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) Linux Test Project, 2020
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* Copyright (c) Wipro Technologies Ltd, 2002
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*/
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/*
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* This is an error test for iopl(2) system call.
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*
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* Verify that
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* 1) iopl(2) returns -1 and sets errno to EINVAL for privilege
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* level greater than 3.
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* 2) iopl(2) returns -1 and sets errno to EPERM if the current
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* user is not the super-user.
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*
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* Author: Subhab Biswas <subhabrata.biswas@wipro.com>
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*/
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#include <errno.h>
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#include <unistd.h>
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#include <pwd.h>
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#include "tst_test.h"
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#include "tst_safe_macros.h"
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#if defined __i386__ || defined(__x86_64__)
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#include <sys/io.h>
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static struct tcase {
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int level;
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char *desc;
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int exp_errno;
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} tcases[] = {
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{4, "Invalid privilege level", EINVAL},
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{1, "Non super-user", EPERM}
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};
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static void verify_iopl(unsigned int i)
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{
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TEST(iopl(tcases[i].level));
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if ((TST_RET == -1) && (TST_ERR == tcases[i].exp_errno)) {
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tst_res(TPASS | TTERRNO,
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"Expected failure for %s, errno: %d",
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tcases[i].desc, TST_ERR);
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} else {
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tst_res(TFAIL | TTERRNO,
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"%s returned %ld expected -1, expected %s got ",
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tcases[i].desc, TST_RET, tst_strerrno(tcases[i].exp_errno));
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}
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}
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static void setup(void)
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{
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struct passwd *pw;
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/* iopl() is restricted under kernel lockdown. */
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if (tst_lockdown_enabled())
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tst_brk(TCONF, "Kernel is locked down, skip this test");
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pw = SAFE_GETPWNAM("nobody");
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SAFE_SETEUID(pw->pw_uid);
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}
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static void cleanup(void)
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{
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SAFE_SETEUID(0);
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}
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static struct tst_test test = {
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.tcnt = ARRAY_SIZE(tcases),
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.test = verify_iopl,
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.needs_root = 1,
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.setup = setup,
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.cleanup = cleanup,
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};
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#else
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TST_TEST_TCONF("LSB v1.3 does not specify iopl() for this architecture. (only for i386 or x86_64)");
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#endif /* __i386_, __x86_64__*/
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