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Test that openat2() rejects unknown flags in the upper 32 bit range. Link: https://lore.kernel.org/r/20210528092417.3942079-4-brauner@kernel.org Cc: Richard Guy Briggs <rgb@redhat.com> Cc: Aleksa Sarai <cyphar@cyphar.com> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
324 lines
9.5 KiB
C
324 lines
9.5 KiB
C
// 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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* O_LARGEFILE is set to 0 by glibc.
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* XXX: This is wrong on {mips, parisc, powerpc, sparc}.
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*/
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#undef O_LARGEFILE
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#define O_LARGEFILE 0x8000
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struct open_how_ext {
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struct open_how inner;
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uint32_t extra1;
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char pad1[128];
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uint32_t extra2;
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char pad2[128];
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uint32_t extra3;
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};
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struct struct_test {
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const char *name;
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struct open_how_ext arg;
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size_t size;
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int err;
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};
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#define NUM_OPENAT2_STRUCT_TESTS 7
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#define NUM_OPENAT2_STRUCT_VARIATIONS 13
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void test_openat2_struct(void)
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{
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int misalignments[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 17, 87 };
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struct struct_test tests[] = {
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/* Normal struct. */
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{ .name = "normal struct",
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.arg.inner.flags = O_RDONLY,
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.size = sizeof(struct open_how) },
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/* Bigger struct, with zeroed out end. */
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{ .name = "bigger struct (zeroed out)",
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.arg.inner.flags = O_RDONLY,
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.size = sizeof(struct open_how_ext) },
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/* TODO: Once expanded, check zero-padding. */
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/* Smaller than version-0 struct. */
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{ .name = "zero-sized 'struct'",
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.arg.inner.flags = O_RDONLY, .size = 0, .err = -EINVAL },
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{ .name = "smaller-than-v0 struct",
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.arg.inner.flags = O_RDONLY,
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.size = OPEN_HOW_SIZE_VER0 - 1, .err = -EINVAL },
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/* Bigger struct, with non-zero trailing bytes. */
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{ .name = "bigger struct (non-zero data in first 'future field')",
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.arg.inner.flags = O_RDONLY, .arg.extra1 = 0xdeadbeef,
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.size = sizeof(struct open_how_ext), .err = -E2BIG },
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{ .name = "bigger struct (non-zero data in middle of 'future fields')",
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.arg.inner.flags = O_RDONLY, .arg.extra2 = 0xfeedcafe,
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.size = sizeof(struct open_how_ext), .err = -E2BIG },
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{ .name = "bigger struct (non-zero data at end of 'future fields')",
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.arg.inner.flags = O_RDONLY, .arg.extra3 = 0xabad1dea,
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.size = sizeof(struct open_how_ext), .err = -E2BIG },
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};
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BUILD_BUG_ON(ARRAY_LEN(misalignments) != NUM_OPENAT2_STRUCT_VARIATIONS);
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BUILD_BUG_ON(ARRAY_LEN(tests) != NUM_OPENAT2_STRUCT_TESTS);
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for (int i = 0; i < ARRAY_LEN(tests); i++) {
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struct struct_test *test = &tests[i];
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struct open_how_ext how_ext = test->arg;
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for (int j = 0; j < ARRAY_LEN(misalignments); j++) {
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int fd, misalign = misalignments[j];
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char *fdpath = NULL;
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bool failed;
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void (*resultfn)(const char *msg, ...) = ksft_test_result_pass;
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void *copy = NULL, *how_copy = &how_ext;
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if (!openat2_supported) {
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ksft_print_msg("openat2(2) unsupported\n");
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resultfn = ksft_test_result_skip;
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goto skip;
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}
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if (misalign) {
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/*
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* Explicitly misalign the structure copying it with the given
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* (mis)alignment offset. The other data is set to be non-zero to
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* make sure that non-zero bytes outside the struct aren't checked
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*
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* This is effectively to check that is_zeroed_user() works.
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*/
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copy = malloc(misalign + sizeof(how_ext));
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how_copy = copy + misalign;
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memset(copy, 0xff, misalign);
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memcpy(how_copy, &how_ext, sizeof(how_ext));
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}
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fd = raw_openat2(AT_FDCWD, ".", how_copy, test->size);
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if (test->err >= 0)
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failed = (fd < 0);
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else
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failed = (fd != test->err);
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if (fd >= 0) {
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fdpath = fdreadlink(fd);
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close(fd);
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}
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if (failed) {
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resultfn = ksft_test_result_fail;
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ksft_print_msg("openat2 unexpectedly returned ");
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if (fdpath)
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ksft_print_msg("%d['%s']\n", fd, fdpath);
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else
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ksft_print_msg("%d (%s)\n", fd, strerror(-fd));
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}
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skip:
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if (test->err >= 0)
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resultfn("openat2 with %s argument [misalign=%d] succeeds\n",
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test->name, misalign);
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else
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resultfn("openat2 with %s argument [misalign=%d] fails with %d (%s)\n",
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test->name, misalign, test->err,
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strerror(-test->err));
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free(copy);
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free(fdpath);
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fflush(stdout);
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}
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}
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}
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struct flag_test {
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const char *name;
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struct open_how how;
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int err;
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};
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#define NUM_OPENAT2_FLAG_TESTS 25
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void test_openat2_flags(void)
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{
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struct flag_test tests[] = {
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/* O_TMPFILE is incompatible with O_PATH and O_CREAT. */
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{ .name = "incompatible flags (O_TMPFILE | O_PATH)",
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.how.flags = O_TMPFILE | O_PATH | O_RDWR, .err = -EINVAL },
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{ .name = "incompatible flags (O_TMPFILE | O_CREAT)",
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.how.flags = O_TMPFILE | O_CREAT | O_RDWR, .err = -EINVAL },
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/* O_PATH only permits certain other flags to be set ... */
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{ .name = "compatible flags (O_PATH | O_CLOEXEC)",
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.how.flags = O_PATH | O_CLOEXEC },
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{ .name = "compatible flags (O_PATH | O_DIRECTORY)",
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.how.flags = O_PATH | O_DIRECTORY },
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{ .name = "compatible flags (O_PATH | O_NOFOLLOW)",
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.how.flags = O_PATH | O_NOFOLLOW },
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/* ... and others are absolutely not permitted. */
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{ .name = "incompatible flags (O_PATH | O_RDWR)",
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.how.flags = O_PATH | O_RDWR, .err = -EINVAL },
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{ .name = "incompatible flags (O_PATH | O_CREAT)",
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.how.flags = O_PATH | O_CREAT, .err = -EINVAL },
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{ .name = "incompatible flags (O_PATH | O_EXCL)",
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.how.flags = O_PATH | O_EXCL, .err = -EINVAL },
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{ .name = "incompatible flags (O_PATH | O_NOCTTY)",
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.how.flags = O_PATH | O_NOCTTY, .err = -EINVAL },
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{ .name = "incompatible flags (O_PATH | O_DIRECT)",
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.how.flags = O_PATH | O_DIRECT, .err = -EINVAL },
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{ .name = "incompatible flags (O_PATH | O_LARGEFILE)",
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.how.flags = O_PATH | O_LARGEFILE, .err = -EINVAL },
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/* ->mode must only be set with O_{CREAT,TMPFILE}. */
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{ .name = "non-zero how.mode and O_RDONLY",
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.how.flags = O_RDONLY, .how.mode = 0600, .err = -EINVAL },
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{ .name = "non-zero how.mode and O_PATH",
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.how.flags = O_PATH, .how.mode = 0600, .err = -EINVAL },
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{ .name = "valid how.mode and O_CREAT",
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.how.flags = O_CREAT, .how.mode = 0600 },
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{ .name = "valid how.mode and O_TMPFILE",
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.how.flags = O_TMPFILE | O_RDWR, .how.mode = 0600 },
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/* ->mode must only contain 0777 bits. */
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{ .name = "invalid how.mode and O_CREAT",
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.how.flags = O_CREAT,
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.how.mode = 0xFFFF, .err = -EINVAL },
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{ .name = "invalid (very large) how.mode and O_CREAT",
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.how.flags = O_CREAT,
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.how.mode = 0xC000000000000000ULL, .err = -EINVAL },
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{ .name = "invalid how.mode and O_TMPFILE",
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.how.flags = O_TMPFILE | O_RDWR,
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.how.mode = 0x1337, .err = -EINVAL },
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{ .name = "invalid (very large) how.mode and O_TMPFILE",
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.how.flags = O_TMPFILE | O_RDWR,
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.how.mode = 0x0000A00000000000ULL, .err = -EINVAL },
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/* ->resolve flags must not conflict. */
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{ .name = "incompatible resolve flags (BENEATH | IN_ROOT)",
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.how.flags = O_RDONLY,
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.how.resolve = RESOLVE_BENEATH | RESOLVE_IN_ROOT,
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.err = -EINVAL },
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/* ->resolve must only contain RESOLVE_* flags. */
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{ .name = "invalid how.resolve and O_RDONLY",
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.how.flags = O_RDONLY,
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.how.resolve = 0x1337, .err = -EINVAL },
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{ .name = "invalid how.resolve and O_CREAT",
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.how.flags = O_CREAT,
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.how.resolve = 0x1337, .err = -EINVAL },
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{ .name = "invalid how.resolve and O_TMPFILE",
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.how.flags = O_TMPFILE | O_RDWR,
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.how.resolve = 0x1337, .err = -EINVAL },
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{ .name = "invalid how.resolve and O_PATH",
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.how.flags = O_PATH,
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.how.resolve = 0x1337, .err = -EINVAL },
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/* currently unknown upper 32 bit rejected. */
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{ .name = "currently unknown bit (1 << 63)",
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.how.flags = O_RDONLY | (1ULL << 63),
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.how.resolve = 0, .err = -EINVAL },
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};
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BUILD_BUG_ON(ARRAY_LEN(tests) != NUM_OPENAT2_FLAG_TESTS);
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for (int i = 0; i < ARRAY_LEN(tests); i++) {
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int fd, fdflags = -1;
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char *path, *fdpath = NULL;
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bool failed = false;
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struct flag_test *test = &tests[i];
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void (*resultfn)(const char *msg, ...) = ksft_test_result_pass;
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if (!openat2_supported) {
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ksft_print_msg("openat2(2) unsupported\n");
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resultfn = ksft_test_result_skip;
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goto skip;
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}
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path = (test->how.flags & O_CREAT) ? "/tmp/ksft.openat2_tmpfile" : ".";
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unlink(path);
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fd = sys_openat2(AT_FDCWD, path, &test->how);
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if (test->err >= 0)
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failed = (fd < 0);
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else
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failed = (fd != test->err);
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if (fd >= 0) {
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int otherflags;
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fdpath = fdreadlink(fd);
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fdflags = fcntl(fd, F_GETFL);
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otherflags = fcntl(fd, F_GETFD);
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close(fd);
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E_assert(fdflags >= 0, "fcntl F_GETFL of new fd");
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E_assert(otherflags >= 0, "fcntl F_GETFD of new fd");
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/* O_CLOEXEC isn't shown in F_GETFL. */
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if (otherflags & FD_CLOEXEC)
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fdflags |= O_CLOEXEC;
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/* O_CREAT is hidden from F_GETFL. */
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if (test->how.flags & O_CREAT)
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fdflags |= O_CREAT;
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if (!(test->how.flags & O_LARGEFILE))
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fdflags &= ~O_LARGEFILE;
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failed |= (fdflags != test->how.flags);
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}
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if (failed) {
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resultfn = ksft_test_result_fail;
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ksft_print_msg("openat2 unexpectedly returned ");
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if (fdpath)
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ksft_print_msg("%d['%s'] with %X (!= %X)\n",
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fd, fdpath, fdflags,
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test->how.flags);
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else
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ksft_print_msg("%d (%s)\n", fd, strerror(-fd));
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}
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skip:
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if (test->err >= 0)
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resultfn("openat2 with %s succeeds\n", test->name);
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else
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resultfn("openat2 with %s fails with %d (%s)\n",
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test->name, test->err, strerror(-test->err));
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free(fdpath);
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fflush(stdout);
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}
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}
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#define NUM_TESTS (NUM_OPENAT2_STRUCT_VARIATIONS * NUM_OPENAT2_STRUCT_TESTS + \
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NUM_OPENAT2_FLAG_TESTS)
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int main(int argc, char **argv)
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{
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ksft_print_header();
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ksft_set_plan(NUM_TESTS);
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test_openat2_struct();
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test_openat2_flags();
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if (ksft_get_fail_cnt() + ksft_get_error_cnt() > 0)
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ksft_exit_fail();
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else
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ksft_exit_pass();
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}
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