524 lines
21 KiB
C
524 lines
21 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Author: Aleksa Sarai <cyphar@cyphar.com>
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* Copyright (C) 2018-2019 SUSE LLC.
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*/
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#define _GNU_SOURCE
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#include <fcntl.h>
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#include <sched.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/mount.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include "../kselftest.h"
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#include "helpers.h"
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/*
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* Construct a test directory with the following structure:
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*
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* root/
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* |-- procexe -> /proc/self/exe
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* |-- procroot -> /proc/self/root
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* |-- root/
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* |-- mnt/ [mountpoint]
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* | |-- self -> ../mnt/
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* | `-- absself -> /mnt/
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* |-- etc/
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* | `-- passwd
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* |-- creatlink -> /newfile3
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* |-- reletc -> etc/
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* |-- relsym -> etc/passwd
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* |-- absetc -> /etc/
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* |-- abssym -> /etc/passwd
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* |-- abscheeky -> /cheeky
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* `-- cheeky/
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* |-- absself -> /
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* |-- self -> ../../root/
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* |-- garbageself -> /../../root/
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* |-- passwd -> ../cheeky/../cheeky/../etc/../etc/passwd
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* |-- abspasswd -> /../cheeky/../cheeky/../etc/../etc/passwd
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* |-- dotdotlink -> ../../../../../../../../../../../../../../etc/passwd
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* `-- garbagelink -> /../../../../../../../../../../../../../../etc/passwd
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*/
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int setup_testdir(void)
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{
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int dfd, tmpfd;
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char dirname[] = "/tmp/ksft-openat2-testdir.XXXXXX";
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/* Unshare and make /tmp a new directory. */
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E_unshare(CLONE_NEWNS);
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E_mount("", "/tmp", "", MS_PRIVATE, "");
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/* Make the top-level directory. */
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if (!mkdtemp(dirname))
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ksft_exit_fail_msg("setup_testdir: failed to create tmpdir\n");
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dfd = open(dirname, O_PATH | O_DIRECTORY);
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if (dfd < 0)
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ksft_exit_fail_msg("setup_testdir: failed to open tmpdir\n");
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/* A sub-directory which is actually used for tests. */
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E_mkdirat(dfd, "root", 0755);
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tmpfd = openat(dfd, "root", O_PATH | O_DIRECTORY);
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if (tmpfd < 0)
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ksft_exit_fail_msg("setup_testdir: failed to open tmpdir\n");
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close(dfd);
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dfd = tmpfd;
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E_symlinkat("/proc/self/exe", dfd, "procexe");
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E_symlinkat("/proc/self/root", dfd, "procroot");
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E_mkdirat(dfd, "root", 0755);
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/* There is no mountat(2), so use chdir. */
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E_mkdirat(dfd, "mnt", 0755);
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E_fchdir(dfd);
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E_mount("tmpfs", "./mnt", "tmpfs", MS_NOSUID | MS_NODEV, "");
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E_symlinkat("../mnt/", dfd, "mnt/self");
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E_symlinkat("/mnt/", dfd, "mnt/absself");
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E_mkdirat(dfd, "etc", 0755);
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E_touchat(dfd, "etc/passwd");
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E_symlinkat("/newfile3", dfd, "creatlink");
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E_symlinkat("etc/", dfd, "reletc");
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E_symlinkat("etc/passwd", dfd, "relsym");
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E_symlinkat("/etc/", dfd, "absetc");
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E_symlinkat("/etc/passwd", dfd, "abssym");
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E_symlinkat("/cheeky", dfd, "abscheeky");
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E_mkdirat(dfd, "cheeky", 0755);
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E_symlinkat("/", dfd, "cheeky/absself");
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E_symlinkat("../../root/", dfd, "cheeky/self");
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E_symlinkat("/../../root/", dfd, "cheeky/garbageself");
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E_symlinkat("../cheeky/../etc/../etc/passwd", dfd, "cheeky/passwd");
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E_symlinkat("/../cheeky/../etc/../etc/passwd", dfd, "cheeky/abspasswd");
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E_symlinkat("../../../../../../../../../../../../../../etc/passwd",
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dfd, "cheeky/dotdotlink");
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E_symlinkat("/../../../../../../../../../../../../../../etc/passwd",
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dfd, "cheeky/garbagelink");
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return dfd;
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}
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struct basic_test {
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const char *name;
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const char *dir;
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const char *path;
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struct open_how how;
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bool pass;
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union {
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int err;
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const char *path;
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} out;
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};
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#define NUM_OPENAT2_OPATH_TESTS 88
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void test_openat2_opath_tests(void)
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{
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int rootfd, hardcoded_fd;
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char *procselfexe, *hardcoded_fdpath;
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E_asprintf(&procselfexe, "/proc/%d/exe", getpid());
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rootfd = setup_testdir();
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hardcoded_fd = open("/dev/null", O_RDONLY);
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E_assert(hardcoded_fd >= 0, "open fd to hardcode");
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E_asprintf(&hardcoded_fdpath, "self/fd/%d", hardcoded_fd);
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struct basic_test tests[] = {
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/** RESOLVE_BENEATH **/
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/* Attempts to cross dirfd should be blocked. */
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{ .name = "[beneath] jump to /",
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.path = "/", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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{ .name = "[beneath] absolute link to $root",
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.path = "cheeky/absself", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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{ .name = "[beneath] chained absolute links to $root",
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.path = "abscheeky/absself", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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{ .name = "[beneath] jump outside $root",
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.path = "..", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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{ .name = "[beneath] temporary jump outside $root",
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.path = "../root/", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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{ .name = "[beneath] symlink temporary jump outside $root",
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.path = "cheeky/self", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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{ .name = "[beneath] chained symlink temporary jump outside $root",
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.path = "abscheeky/self", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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{ .name = "[beneath] garbage links to $root",
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.path = "cheeky/garbageself", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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{ .name = "[beneath] chained garbage links to $root",
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.path = "abscheeky/garbageself", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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/* Only relative paths that stay inside dirfd should work. */
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{ .name = "[beneath] ordinary path to 'root'",
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.path = "root", .how.resolve = RESOLVE_BENEATH,
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.out.path = "root", .pass = true },
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{ .name = "[beneath] ordinary path to 'etc'",
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.path = "etc", .how.resolve = RESOLVE_BENEATH,
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.out.path = "etc", .pass = true },
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{ .name = "[beneath] ordinary path to 'etc/passwd'",
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.path = "etc/passwd", .how.resolve = RESOLVE_BENEATH,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[beneath] relative symlink inside $root",
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.path = "relsym", .how.resolve = RESOLVE_BENEATH,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[beneath] chained-'..' relative symlink inside $root",
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.path = "cheeky/passwd", .how.resolve = RESOLVE_BENEATH,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[beneath] absolute symlink component outside $root",
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.path = "abscheeky/passwd", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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{ .name = "[beneath] absolute symlink target outside $root",
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.path = "abssym", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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{ .name = "[beneath] absolute path outside $root",
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.path = "/etc/passwd", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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{ .name = "[beneath] cheeky absolute path outside $root",
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.path = "cheeky/abspasswd", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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{ .name = "[beneath] chained cheeky absolute path outside $root",
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.path = "abscheeky/abspasswd", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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/* Tricky paths should fail. */
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{ .name = "[beneath] tricky '..'-chained symlink outside $root",
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.path = "cheeky/dotdotlink", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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{ .name = "[beneath] tricky absolute + '..'-chained symlink outside $root",
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.path = "abscheeky/dotdotlink", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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{ .name = "[beneath] tricky garbage link outside $root",
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.path = "cheeky/garbagelink", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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{ .name = "[beneath] tricky absolute + garbage link outside $root",
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.path = "abscheeky/garbagelink", .how.resolve = RESOLVE_BENEATH,
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.out.err = -EXDEV, .pass = false },
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/** RESOLVE_IN_ROOT **/
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/* All attempts to cross the dirfd will be scoped-to-root. */
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{ .name = "[in_root] jump to /",
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.path = "/", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = NULL, .pass = true },
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{ .name = "[in_root] absolute symlink to /root",
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.path = "cheeky/absself", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = NULL, .pass = true },
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{ .name = "[in_root] chained absolute symlinks to /root",
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.path = "abscheeky/absself", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = NULL, .pass = true },
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{ .name = "[in_root] '..' at root",
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.path = "..", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = NULL, .pass = true },
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{ .name = "[in_root] '../root' at root",
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.path = "../root/", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "root", .pass = true },
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{ .name = "[in_root] relative symlink containing '..' above root",
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.path = "cheeky/self", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "root", .pass = true },
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{ .name = "[in_root] garbage link to /root",
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.path = "cheeky/garbageself", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "root", .pass = true },
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{ .name = "[in_root] chained garbage links to /root",
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.path = "abscheeky/garbageself", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "root", .pass = true },
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{ .name = "[in_root] relative path to 'root'",
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.path = "root", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "root", .pass = true },
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{ .name = "[in_root] relative path to 'etc'",
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.path = "etc", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "etc", .pass = true },
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{ .name = "[in_root] relative path to 'etc/passwd'",
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.path = "etc/passwd", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[in_root] relative symlink to 'etc/passwd'",
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.path = "relsym", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[in_root] chained-'..' relative symlink to 'etc/passwd'",
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.path = "cheeky/passwd", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[in_root] chained-'..' absolute + relative symlink to 'etc/passwd'",
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.path = "abscheeky/passwd", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[in_root] absolute symlink to 'etc/passwd'",
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.path = "abssym", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[in_root] absolute path 'etc/passwd'",
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.path = "/etc/passwd", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[in_root] cheeky absolute path 'etc/passwd'",
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.path = "cheeky/abspasswd", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[in_root] chained cheeky absolute path 'etc/passwd'",
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.path = "abscheeky/abspasswd", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[in_root] tricky '..'-chained symlink outside $root",
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.path = "cheeky/dotdotlink", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[in_root] tricky absolute + '..'-chained symlink outside $root",
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.path = "abscheeky/dotdotlink", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[in_root] tricky absolute path + absolute + '..'-chained symlink outside $root",
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.path = "/../../../../abscheeky/dotdotlink", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[in_root] tricky garbage link outside $root",
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.path = "cheeky/garbagelink", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[in_root] tricky absolute + garbage link outside $root",
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.path = "abscheeky/garbagelink", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "etc/passwd", .pass = true },
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{ .name = "[in_root] tricky absolute path + absolute + garbage link outside $root",
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.path = "/../../../../abscheeky/garbagelink", .how.resolve = RESOLVE_IN_ROOT,
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.out.path = "etc/passwd", .pass = true },
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/* O_CREAT should handle trailing symlinks correctly. */
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{ .name = "[in_root] O_CREAT of relative path inside $root",
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.path = "newfile1", .how.flags = O_CREAT,
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.how.mode = 0700,
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.how.resolve = RESOLVE_IN_ROOT,
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.out.path = "newfile1", .pass = true },
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{ .name = "[in_root] O_CREAT of absolute path",
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||
|
|
.path = "/newfile2", .how.flags = O_CREAT,
|
||
|
|
.how.mode = 0700,
|
||
|
|
.how.resolve = RESOLVE_IN_ROOT,
|
||
|
|
.out.path = "newfile2", .pass = true },
|
||
|
|
{ .name = "[in_root] O_CREAT of tricky symlink outside root",
|
||
|
|
.path = "/creatlink", .how.flags = O_CREAT,
|
||
|
|
.how.mode = 0700,
|
||
|
|
.how.resolve = RESOLVE_IN_ROOT,
|
||
|
|
.out.path = "newfile3", .pass = true },
|
||
|
|
|
||
|
|
/** RESOLVE_NO_XDEV **/
|
||
|
|
/* Crossing *down* into a mountpoint is disallowed. */
|
||
|
|
{ .name = "[no_xdev] cross into $mnt",
|
||
|
|
.path = "mnt", .how.resolve = RESOLVE_NO_XDEV,
|
||
|
|
.out.err = -EXDEV, .pass = false },
|
||
|
|
{ .name = "[no_xdev] cross into $mnt/",
|
||
|
|
.path = "mnt/", .how.resolve = RESOLVE_NO_XDEV,
|
||
|
|
.out.err = -EXDEV, .pass = false },
|
||
|
|
{ .name = "[no_xdev] cross into $mnt/.",
|
||
|
|
.path = "mnt/.", .how.resolve = RESOLVE_NO_XDEV,
|
||
|
|
.out.err = -EXDEV, .pass = false },
|
||
|
|
/* Crossing *up* out of a mountpoint is disallowed. */
|
||
|
|
{ .name = "[no_xdev] goto mountpoint root",
|
||
|
|
.dir = "mnt", .path = ".", .how.resolve = RESOLVE_NO_XDEV,
|
||
|
|
.out.path = "mnt", .pass = true },
|
||
|
|
{ .name = "[no_xdev] cross up through '..'",
|
||
|
|
.dir = "mnt", .path = "..", .how.resolve = RESOLVE_NO_XDEV,
|
||
|
|
.out.err = -EXDEV, .pass = false },
|
||
|
|
{ .name = "[no_xdev] temporary cross up through '..'",
|
||
|
|
.dir = "mnt", .path = "../mnt", .how.resolve = RESOLVE_NO_XDEV,
|
||
|
|
.out.err = -EXDEV, .pass = false },
|
||
|
|
{ .name = "[no_xdev] temporary relative symlink cross up",
|
||
|
|
.dir = "mnt", .path = "self", .how.resolve = RESOLVE_NO_XDEV,
|
||
|
|
.out.err = -EXDEV, .pass = false },
|
||
|
|
{ .name = "[no_xdev] temporary absolute symlink cross up",
|
||
|
|
.dir = "mnt", .path = "absself", .how.resolve = RESOLVE_NO_XDEV,
|
||
|
|
.out.err = -EXDEV, .pass = false },
|
||
|
|
/* Jumping to "/" is ok, but later components cannot cross. */
|
||
|
|
{ .name = "[no_xdev] jump to / directly",
|
||
|
|
.dir = "mnt", .path = "/", .how.resolve = RESOLVE_NO_XDEV,
|
||
|
|
.out.path = "/", .pass = true },
|
||
|
|
{ .name = "[no_xdev] jump to / (from /) directly",
|
||
|
|
.dir = "/", .path = "/", .how.resolve = RESOLVE_NO_XDEV,
|
||
|
|
.out.path = "/", .pass = true },
|
||
|
|
{ .name = "[no_xdev] jump to / then proc",
|
||
|
|
.path = "/proc/1", .how.resolve = RESOLVE_NO_XDEV,
|
||
|
|
.out.err = -EXDEV, .pass = false },
|
||
|
|
{ .name = "[no_xdev] jump to / then tmp",
|
||
|
|
.path = "/tmp", .how.resolve = RESOLVE_NO_XDEV,
|
||
|
|
.out.err = -EXDEV, .pass = false },
|
||
|
|
/* Magic-links are blocked since they can switch vfsmounts. */
|
||
|
|
{ .name = "[no_xdev] cross through magic-link to self/root",
|
||
|
|
.dir = "/proc", .path = "self/root", .how.resolve = RESOLVE_NO_XDEV,
|
||
|
|
.out.err = -EXDEV, .pass = false },
|
||
|
|
{ .name = "[no_xdev] cross through magic-link to self/cwd",
|
||
|
|
.dir = "/proc", .path = "self/cwd", .how.resolve = RESOLVE_NO_XDEV,
|
||
|
|
.out.err = -EXDEV, .pass = false },
|
||
|
|
/* Except magic-link jumps inside the same vfsmount. */
|
||
|
|
{ .name = "[no_xdev] jump through magic-link to same procfs",
|
||
|
|
.dir = "/proc", .path = hardcoded_fdpath, .how.resolve = RESOLVE_NO_XDEV,
|
||
|
|
.out.path = "/proc", .pass = true, },
|
||
|
|
|
||
|
|
/** RESOLVE_NO_MAGICLINKS **/
|
||
|
|
/* Regular symlinks should work. */
|
||
|
|
{ .name = "[no_magiclinks] ordinary relative symlink",
|
||
|
|
.path = "relsym", .how.resolve = RESOLVE_NO_MAGICLINKS,
|
||
|
|
.out.path = "etc/passwd", .pass = true },
|
||
|
|
/* Magic-links should not work. */
|
||
|
|
{ .name = "[no_magiclinks] symlink to magic-link",
|
||
|
|
.path = "procexe", .how.resolve = RESOLVE_NO_MAGICLINKS,
|
||
|
|
.out.err = -ELOOP, .pass = false },
|
||
|
|
{ .name = "[no_magiclinks] normal path to magic-link",
|
||
|
|
.path = "/proc/self/exe", .how.resolve = RESOLVE_NO_MAGICLINKS,
|
||
|
|
.out.err = -ELOOP, .pass = false },
|
||
|
|
{ .name = "[no_magiclinks] normal path to magic-link with O_NOFOLLOW",
|
||
|
|
.path = "/proc/self/exe", .how.flags = O_NOFOLLOW,
|
||
|
|
.how.resolve = RESOLVE_NO_MAGICLINKS,
|
||
|
|
.out.path = procselfexe, .pass = true },
|
||
|
|
{ .name = "[no_magiclinks] symlink to magic-link path component",
|
||
|
|
.path = "procroot/etc", .how.resolve = RESOLVE_NO_MAGICLINKS,
|
||
|
|
.out.err = -ELOOP, .pass = false },
|
||
|
|
{ .name = "[no_magiclinks] magic-link path component",
|
||
|
|
.path = "/proc/self/root/etc", .how.resolve = RESOLVE_NO_MAGICLINKS,
|
||
|
|
.out.err = -ELOOP, .pass = false },
|
||
|
|
{ .name = "[no_magiclinks] magic-link path component with O_NOFOLLOW",
|
||
|
|
.path = "/proc/self/root/etc", .how.flags = O_NOFOLLOW,
|
||
|
|
.how.resolve = RESOLVE_NO_MAGICLINKS,
|
||
|
|
.out.err = -ELOOP, .pass = false },
|
||
|
|
|
||
|
|
/** RESOLVE_NO_SYMLINKS **/
|
||
|
|
/* Normal paths should work. */
|
||
|
|
{ .name = "[no_symlinks] ordinary path to '.'",
|
||
|
|
.path = ".", .how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.path = NULL, .pass = true },
|
||
|
|
{ .name = "[no_symlinks] ordinary path to 'root'",
|
||
|
|
.path = "root", .how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.path = "root", .pass = true },
|
||
|
|
{ .name = "[no_symlinks] ordinary path to 'etc'",
|
||
|
|
.path = "etc", .how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.path = "etc", .pass = true },
|
||
|
|
{ .name = "[no_symlinks] ordinary path to 'etc/passwd'",
|
||
|
|
.path = "etc/passwd", .how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.path = "etc/passwd", .pass = true },
|
||
|
|
/* Regular symlinks are blocked. */
|
||
|
|
{ .name = "[no_symlinks] relative symlink target",
|
||
|
|
.path = "relsym", .how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.err = -ELOOP, .pass = false },
|
||
|
|
{ .name = "[no_symlinks] relative symlink component",
|
||
|
|
.path = "reletc/passwd", .how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.err = -ELOOP, .pass = false },
|
||
|
|
{ .name = "[no_symlinks] absolute symlink target",
|
||
|
|
.path = "abssym", .how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.err = -ELOOP, .pass = false },
|
||
|
|
{ .name = "[no_symlinks] absolute symlink component",
|
||
|
|
.path = "absetc/passwd", .how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.err = -ELOOP, .pass = false },
|
||
|
|
{ .name = "[no_symlinks] cheeky garbage link",
|
||
|
|
.path = "cheeky/garbagelink", .how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.err = -ELOOP, .pass = false },
|
||
|
|
{ .name = "[no_symlinks] cheeky absolute + garbage link",
|
||
|
|
.path = "abscheeky/garbagelink", .how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.err = -ELOOP, .pass = false },
|
||
|
|
{ .name = "[no_symlinks] cheeky absolute + absolute symlink",
|
||
|
|
.path = "abscheeky/absself", .how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.err = -ELOOP, .pass = false },
|
||
|
|
/* Trailing symlinks with NO_FOLLOW. */
|
||
|
|
{ .name = "[no_symlinks] relative symlink with O_NOFOLLOW",
|
||
|
|
.path = "relsym", .how.flags = O_NOFOLLOW,
|
||
|
|
.how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.path = "relsym", .pass = true },
|
||
|
|
{ .name = "[no_symlinks] absolute symlink with O_NOFOLLOW",
|
||
|
|
.path = "abssym", .how.flags = O_NOFOLLOW,
|
||
|
|
.how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.path = "abssym", .pass = true },
|
||
|
|
{ .name = "[no_symlinks] trailing symlink with O_NOFOLLOW",
|
||
|
|
.path = "cheeky/garbagelink", .how.flags = O_NOFOLLOW,
|
||
|
|
.how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.path = "cheeky/garbagelink", .pass = true },
|
||
|
|
{ .name = "[no_symlinks] multiple symlink components with O_NOFOLLOW",
|
||
|
|
.path = "abscheeky/absself", .how.flags = O_NOFOLLOW,
|
||
|
|
.how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.err = -ELOOP, .pass = false },
|
||
|
|
{ .name = "[no_symlinks] multiple symlink (and garbage link) components with O_NOFOLLOW",
|
||
|
|
.path = "abscheeky/garbagelink", .how.flags = O_NOFOLLOW,
|
||
|
|
.how.resolve = RESOLVE_NO_SYMLINKS,
|
||
|
|
.out.err = -ELOOP, .pass = false },
|
||
|
|
};
|
||
|
|
|
||
|
|
BUILD_BUG_ON(ARRAY_LEN(tests) != NUM_OPENAT2_OPATH_TESTS);
|
||
|
|
|
||
|
|
for (int i = 0; i < ARRAY_LEN(tests); i++) {
|
||
|
|
int dfd, fd;
|
||
|
|
char *fdpath = NULL;
|
||
|
|
bool failed;
|
||
|
|
void (*resultfn)(const char *msg, ...) = ksft_test_result_pass;
|
||
|
|
struct basic_test *test = &tests[i];
|
||
|
|
|
||
|
|
if (!openat2_supported) {
|
||
|
|
ksft_print_msg("openat2(2) unsupported\n");
|
||
|
|
resultfn = ksft_test_result_skip;
|
||
|
|
goto skip;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Auto-set O_PATH. */
|
||
|
|
if (!(test->how.flags & O_CREAT))
|
||
|
|
test->how.flags |= O_PATH;
|
||
|
|
|
||
|
|
if (test->dir)
|
||
|
|
dfd = openat(rootfd, test->dir, O_PATH | O_DIRECTORY);
|
||
|
|
else
|
||
|
|
dfd = dup(rootfd);
|
||
|
|
E_assert(dfd, "failed to openat root '%s': %m", test->dir);
|
||
|
|
|
||
|
|
E_dup2(dfd, hardcoded_fd);
|
||
|
|
|
||
|
|
fd = sys_openat2(dfd, test->path, &test->how);
|
||
|
|
if (test->pass)
|
||
|
|
failed = (fd < 0 || !fdequal(fd, rootfd, test->out.path));
|
||
|
|
else
|
||
|
|
failed = (fd != test->out.err);
|
||
|
|
if (fd >= 0) {
|
||
|
|
fdpath = fdreadlink(fd);
|
||
|
|
close(fd);
|
||
|
|
}
|
||
|
|
close(dfd);
|
||
|
|
|
||
|
|
if (failed) {
|
||
|
|
resultfn = ksft_test_result_fail;
|
||
|
|
|
||
|
|
ksft_print_msg("openat2 unexpectedly returned ");
|
||
|
|
if (fdpath)
|
||
|
|
ksft_print_msg("%d['%s']\n", fd, fdpath);
|
||
|
|
else
|
||
|
|
ksft_print_msg("%d (%s)\n", fd, strerror(-fd));
|
||
|
|
}
|
||
|
|
|
||
|
|
skip:
|
||
|
|
if (test->pass)
|
||
|
|
resultfn("%s gives path '%s'\n", test->name,
|
||
|
|
test->out.path ?: ".");
|
||
|
|
else
|
||
|
|
resultfn("%s fails with %d (%s)\n", test->name,
|
||
|
|
test->out.err, strerror(-test->out.err));
|
||
|
|
|
||
|
|
fflush(stdout);
|
||
|
|
free(fdpath);
|
||
|
|
}
|
||
|
|
|
||
|
|
free(procselfexe);
|
||
|
|
close(rootfd);
|
||
|
|
|
||
|
|
free(hardcoded_fdpath);
|
||
|
|
close(hardcoded_fd);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define NUM_TESTS NUM_OPENAT2_OPATH_TESTS
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
ksft_print_header();
|
||
|
|
ksft_set_plan(NUM_TESTS);
|
||
|
|
|
||
|
|
/* NOTE: We should be checking for CAP_SYS_ADMIN here... */
|
||
|
|
if (geteuid() != 0)
|
||
|
|
ksft_exit_skip("all tests require euid == 0\n");
|
||
|
|
|
||
|
|
test_openat2_opath_tests();
|
||
|
|
|
||
|
|
if (ksft_get_fail_cnt() + ksft_get_error_cnt() > 0)
|
||
|
|
ksft_exit_fail();
|
||
|
|
else
|
||
|
|
ksft_exit_pass();
|
||
|
|
}
|