diff options
Diffstat (limited to 'lib/libc/tests/gen/realpath2_test.c')
| -rw-r--r-- | lib/libc/tests/gen/realpath2_test.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/lib/libc/tests/gen/realpath2_test.c b/lib/libc/tests/gen/realpath2_test.c new file mode 100644 index 000000000000..431df8721ae0 --- /dev/null +++ b/lib/libc/tests/gen/realpath2_test.c @@ -0,0 +1,181 @@ +/* + * Copyright (c) 2017 Jan Kokemüller + * All rights reserved. + * Copyright (c) 2025 Klara, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/param.h> +#include <sys/stat.h> + +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include <atf-c.h> + +ATF_TC(realpath_null); +ATF_TC_HEAD(realpath_null, tc) +{ + atf_tc_set_md_var(tc, "descr", "Test null input"); +} +ATF_TC_BODY(realpath_null, tc) +{ + ATF_REQUIRE_ERRNO(EINVAL, realpath(NULL, NULL) == NULL); +} + +ATF_TC(realpath_empty); +ATF_TC_HEAD(realpath_empty, tc) +{ + atf_tc_set_md_var(tc, "descr", "Test empty input"); +} +ATF_TC_BODY(realpath_empty, tc) +{ + char resb[PATH_MAX] = ""; + + ATF_REQUIRE_EQ(0, mkdir("foo", 0755)); + ATF_REQUIRE_EQ(0, chdir("foo")); + ATF_REQUIRE_ERRNO(ENOENT, realpath("", resb) == NULL); + ATF_REQUIRE_STREQ("", resb); +} + +ATF_TC(realpath_buffer_overflow); +ATF_TC_HEAD(realpath_buffer_overflow, tc) +{ + atf_tc_set_md_var(tc, "descr", + "Test for out of bounds read from 'left' array " + "(compile realpath.c with '-fsanitize=address')"); +} + +ATF_TC_BODY(realpath_buffer_overflow, tc) +{ + char path[PATH_MAX] = ""; + char resb[PATH_MAX] = ""; + + memset(path, 'a', sizeof(path) - 1); + path[1] = '/'; + ATF_REQUIRE(realpath(path, resb) == NULL); +} + +ATF_TC(realpath_empty_symlink); +ATF_TC_HEAD(realpath_empty_symlink, tc) +{ + atf_tc_set_md_var(tc, "descr", + "Test for correct behavior when encountering empty symlinks"); +} + +ATF_TC_BODY(realpath_empty_symlink, tc) +{ + char path[PATH_MAX] = ""; + char slnk[PATH_MAX] = ""; + char resb[PATH_MAX] = ""; + int fd; + + (void)strlcat(slnk, "empty_symlink", sizeof(slnk)); + + ATF_REQUIRE(symlink("", slnk) == 0); + + fd = open("aaa", O_RDONLY | O_CREAT, 0600); + + ATF_REQUIRE(fd >= 0); + ATF_REQUIRE(close(fd) == 0); + + (void)strlcat(path, "empty_symlink", sizeof(path)); + (void)strlcat(path, "/aaa", sizeof(path)); + + ATF_REQUIRE_ERRNO(ENOENT, realpath(path, resb) == NULL); + + ATF_REQUIRE(unlink("aaa") == 0); + ATF_REQUIRE(unlink(slnk) == 0); +} + +ATF_TC(realpath_partial); +ATF_TC_HEAD(realpath_partial, tc) +{ + atf_tc_set_md_var(tc, "descr", + "Test that failure leaves a partial result"); + atf_tc_set_md_var(tc, "require.user", "unprivileged"); +} + +ATF_TC_BODY(realpath_partial, tc) +{ + char resb[PATH_MAX] = ""; + size_t len; + + /* scenario 1: missing directory */ + ATF_REQUIRE_EQ(0, mkdir("foo", 0755)); + ATF_REQUIRE_ERRNO(ENOENT, realpath("foo/bar/baz", resb) == NULL); + len = strnlen(resb, sizeof(resb)); + ATF_REQUIRE(len > 8 && len < sizeof(resb)); + ATF_REQUIRE_STREQ("/foo/bar", resb + len - 8); + + /* scenario 2: dead link 1 */ + ATF_REQUIRE_EQ(0, symlink("nix", "foo/bar")); + ATF_REQUIRE_ERRNO(ENOENT, realpath("foo/bar/baz", resb) == NULL); + len = strnlen(resb, sizeof(resb)); + ATF_REQUIRE(len > 8 && len < sizeof(resb)); + ATF_REQUIRE_STREQ("/foo/nix", resb + len - 8); + + /* scenario 3: missing file */ + ATF_REQUIRE_EQ(0, unlink("foo/bar")); + ATF_REQUIRE_EQ(0, mkdir("foo/bar", 0755)); + ATF_REQUIRE_ERRNO(ENOENT, realpath("foo/bar/baz", resb) == NULL); + len = strnlen(resb, sizeof(resb)); + ATF_REQUIRE(len > 12 && len < sizeof(resb)); + ATF_REQUIRE_STREQ("/foo/bar/baz", resb + len - 12); + + /* scenario 4: dead link 2 */ + ATF_REQUIRE_EQ(0, symlink("nix", "foo/bar/baz")); + ATF_REQUIRE_ERRNO(ENOENT, realpath("foo/bar/baz", resb) == NULL); + len = strnlen(resb, sizeof(resb)); + ATF_REQUIRE(len > 12 && len < sizeof(resb)); + ATF_REQUIRE_STREQ("/foo/bar/nix", resb + len - 12); + + /* scenario 5: unreadable directory */ + ATF_REQUIRE_EQ(0, chmod("foo", 000)); + ATF_REQUIRE_ERRNO(EACCES, realpath("foo/bar/baz", resb) == NULL); + len = strnlen(resb, sizeof(resb)); + ATF_REQUIRE(len > 4 && len < sizeof(resb)); + ATF_REQUIRE_STREQ("/foo", resb + len - 4); + + /* scenario 6: not a directory */ + ATF_REQUIRE_EQ(0, close(creat("bar", 0644))); + ATF_REQUIRE_ERRNO(ENOTDIR, realpath("bar/baz", resb) == NULL); + len = strnlen(resb, sizeof(resb)); + ATF_REQUIRE(len > 4 && len < sizeof(resb)); + ATF_REQUIRE_STREQ("/bar", resb + len - 4); +} + +ATF_TP_ADD_TCS(tp) +{ + ATF_TP_ADD_TC(tp, realpath_null); + ATF_TP_ADD_TC(tp, realpath_empty); + ATF_TP_ADD_TC(tp, realpath_buffer_overflow); + ATF_TP_ADD_TC(tp, realpath_empty_symlink); + ATF_TP_ADD_TC(tp, realpath_partial); + + return atf_no_error(); +} |