102 lines
2.5 KiB
C
102 lines
2.5 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 ioperm(2) system call.
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*
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* Verify that
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* 1) ioperm(2) returns -1 and sets errno to EINVAL for I/O port
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* address greater than 0x3ff.
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* 2) ioperm(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 <stdlib.h>
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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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#define NUM_BYTES 3
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#ifndef IO_BITMAP_BITS
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#define IO_BITMAP_BITS 1024 /* set to default value since some H/W may not support 0x10000 even with a 2.6.8 kernel */
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#define IO_BITMAP_BITS_16 65536
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#endif
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static struct tcase_t {
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long from;
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long num;
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int turn_on;
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char *desc;
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int exp_errno;
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} tcases[] = {
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{0, NUM_BYTES, 1, "Invalid I/O address", EINVAL},
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{0, NUM_BYTES, 1, "Non super-user", EPERM},
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};
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static void setup(void)
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{
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/* ioperm() 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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/*
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* The value of IO_BITMAP_BITS (include/asm-i386/processor.h) changed
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* from kernel 2.6.8 to permit 16-bits (65536) ioperm
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*
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* Ricky Ng-Adam, rngadam@yahoo.com
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*/
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if ((tst_kvercmp(2, 6, 8) < 0) || (tst_kvercmp(2, 6, 9) == 0)) {
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tcases[0].from = (IO_BITMAP_BITS - NUM_BYTES) + 1;
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tcases[1].from = IO_BITMAP_BITS - NUM_BYTES;
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} else {
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tcases[0].from = (IO_BITMAP_BITS_16 - NUM_BYTES) + 1;
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tcases[1].from = IO_BITMAP_BITS_16 - NUM_BYTES;
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}
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struct passwd *pw;
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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 void verify_ioperm(unsigned int i)
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{
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TEST(ioperm(tcases[i].from, tcases[i].num, tcases[i].turn_on));
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if ((TST_RET == -1) && (TST_ERR == tcases[i].exp_errno)) {
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tst_res(TPASS | TTERRNO, "Expected failure for %s, "
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"errno: %d", tcases[i].desc, TST_ERR);
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} else {
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tst_res(TFAIL | TTERRNO, "Unexpected results for %s ; "
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"returned %ld (expected -1), errno %d "
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"(expected errno %d)", tcases[i].desc,
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TST_RET, TST_ERR, tcases[i].exp_errno);
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}
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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_ioperm,
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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 ioperm() for this architecture. (only for i386 or x86_64)");
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#endif /* __i386_, __x86_64__*/
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