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127 lines
3.5 KiB
127 lines
3.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) International Business Machines Corp., 2001
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* Ported to LTP: Wayne Boyer
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*/
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/*
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* Test Description :
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* 1) readlink(2) returns -1 and sets errno to EACCES if search/write
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* permission is denied in the directory where the symbolic link
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* resides.
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* 2) readlink(2) returns -1 and sets errno to EINVAL if the buffer size
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* is not positive.
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* 3) readlink(2) returns -1 and sets errno to EINVAL if the specified
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* file is not a symbolic link file.
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* 4) readlink(2) returns -1 and sets errno to ENAMETOOLONG if the
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* pathname component of symbolic link is too long (ie, > PATH_MAX).
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* 5) readlink(2) returns -1 and sets errno to ENOENT if the component of
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* symbolic link points to an empty string.
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* 6) readlink(2) returns -1 and sets errno to ENOTDIR if a component of
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* the path prefix is not a directory.
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* 7) readlink(2) returns -1 and sets errno to ELOOP if too many symbolic
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* links were encountered in translating the pathname.
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* 8) readlink(2) returns -1 and sets errno to EFAULT if buf outside the
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* process allocated address space.
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*/
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#include <pwd.h>
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#include <errno.h>
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#include <string.h>
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#include "tst_test.h"
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#define DIR_TEMP "test_dir_1"
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#define TEST_FILE1 "test_dir_1/test_file_1"
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#define SYM_FILE1 "test_dir_1/slink_file_1"
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#define TEST_FILE2 "test_file_2"
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#define SYM_FILE2 "slink_file_2"
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#define TEST_FILE3 "test_file_3"
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#define SYM_FILE3 "test_file_3/slink_file_3"
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#define ELOOPFILE "/test_eloop"
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#define TESTFILE "test_file"
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#define SYMFILE "slink_file"
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static char longpathname[PATH_MAX + 2];
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static char elooppathname[sizeof(ELOOPFILE) * 43] = ".";
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static char buffer[256];
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static struct tcase {
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char *link;
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char *buf;
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size_t buf_size;
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int exp_errno;
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} tcases[] = {
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{SYM_FILE1, buffer, sizeof(buffer), EACCES},
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{SYM_FILE2, buffer, 0, EINVAL},
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{TEST_FILE2, buffer, sizeof(buffer), EINVAL},
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{longpathname, buffer, sizeof(buffer), ENAMETOOLONG},
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{"", buffer, sizeof(buffer), ENOENT},
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{SYM_FILE3, buffer, sizeof(buffer), ENOTDIR},
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{elooppathname, buffer, sizeof(buffer), ELOOP},
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{SYMFILE, (char *)-1, sizeof(buffer), EFAULT},
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};
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static void verify_readlink(unsigned int n)
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{
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struct tcase *tc = &tcases[n];
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TEST(readlink(tc->link, tc->buf, tc->buf_size));
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if (TST_RET != -1) {
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tst_res(TFAIL, "readlink() sueeeeded unexpectedly");
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return;
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}
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if (TST_ERR != tc->exp_errno) {
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tst_res(TFAIL | TTERRNO,
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"readlink() failed unexpectedly; expected: %d - %s, got",
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tc->exp_errno, tst_strerrno(tc->exp_errno));
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if (tc->exp_errno == ENOENT && TST_ERR == EINVAL) {
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tst_res(TWARN | TTERRNO,
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"It may be a Kernel Bug, see the patch:"
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"http://git.kernel.org/linus/1fa1e7f6");
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}
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} else {
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tst_res(TPASS | TTERRNO, "readlink() failed as expected");
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}
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}
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static void setup(void)
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{
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int i;
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struct passwd *pwent;
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pwent = SAFE_GETPWNAM("nobody");
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SAFE_SETEUID(pwent->pw_uid);
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SAFE_MKDIR(DIR_TEMP, 0777);
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SAFE_TOUCH(TEST_FILE1, 0666, NULL);
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SAFE_SYMLINK(TEST_FILE1, SYM_FILE1);
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SAFE_CHMOD(DIR_TEMP, 0444);
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SAFE_TOUCH(TEST_FILE2, 0666, NULL);
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SAFE_SYMLINK(TEST_FILE2, SYM_FILE2);
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memset(longpathname, 'a', PATH_MAX + 1);
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SAFE_TOUCH(TEST_FILE3, 0666, NULL);
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SAFE_MKDIR("test_eloop", 0777);
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SAFE_SYMLINK("../test_eloop", "test_eloop/test_eloop");
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for (i = 0; i < 43; i++)
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strcat(elooppathname, ELOOPFILE);
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SAFE_TOUCH(TESTFILE, 0666, NULL);
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SAFE_SYMLINK(TESTFILE, SYMFILE);
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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_readlink,
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.setup = setup,
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.needs_tmpdir = 1,
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.needs_root = 1,
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};
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