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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Author: Aleksa Sarai <cyphar@cyphar.com>
* Copyright (C) 2018-2019 SUSE LLC.
*/
#define _GNU_SOURCE
#include <fcntl.h>
#include <sched.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include "../kselftest.h"
#include "helpers.h"
/*
* O_LARGEFILE is set to 0 by glibc.
* XXX: This is wrong on {mips, parisc, powerpc, sparc}.
*/
#undef O_LARGEFILE
#define O_LARGEFILE 0x8000
struct open_how_ext {
struct open_how inner;
uint32_t extra1;
char pad1[128];
uint32_t extra2;
char pad2[128];
uint32_t extra3;
};
struct struct_test {
const char *name;
struct open_how_ext arg;
size_t size;
int err;
};
#define NUM_OPENAT2_STRUCT_TESTS 7
#define NUM_OPENAT2_STRUCT_VARIATIONS 13
void test_openat2_struct(void)
{
int misalignments[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 17, 87 };
struct struct_test tests[] = {
/* Normal struct. */
{ .name = "normal struct",
.arg.inner.flags = O_RDONLY,
.size = sizeof(struct open_how) },
/* Bigger struct, with zeroed out end. */
{ .name = "bigger struct (zeroed out)",
.arg.inner.flags = O_RDONLY,
.size = sizeof(struct open_how_ext) },
/* TODO: Once expanded, check zero-padding. */
/* Smaller than version-0 struct. */
{ .name = "zero-sized 'struct'",
.arg.inner.flags = O_RDONLY, .size = 0, .err = -EINVAL },
{ .name = "smaller-than-v0 struct",
.arg.inner.flags = O_RDONLY,
.size = OPEN_HOW_SIZE_VER0 - 1, .err = -EINVAL },
/* Bigger struct, with non-zero trailing bytes. */
{ .name = "bigger struct (non-zero data in first 'future field')",
.arg.inner.flags = O_RDONLY, .arg.extra1 = 0xdeadbeef,
.size = sizeof(struct open_how_ext), .err = -E2BIG },
{ .name = "bigger struct (non-zero data in middle of 'future fields')",
.arg.inner.flags = O_RDONLY, .arg.extra2 = 0xfeedcafe,
.size = sizeof(struct open_how_ext), .err = -E2BIG },
{ .name = "bigger struct (non-zero data at end of 'future fields')",
.arg.inner.flags = O_RDONLY, .arg.extra3 = 0xabad1dea,
.size = sizeof(struct open_how_ext), .err = -E2BIG },
};
BUILD_BUG_ON(ARRAY_LEN(misalignments) != NUM_OPENAT2_STRUCT_VARIATIONS);
BUILD_BUG_ON(ARRAY_LEN(tests) != NUM_OPENAT2_STRUCT_TESTS);
for (int i = 0; i < ARRAY_LEN(tests); i++) {
struct struct_test *test = &tests[i];
struct open_how_ext how_ext = test->arg;
for (int j = 0; j < ARRAY_LEN(misalignments); j++) {
int fd, misalign = misalignments[j];
char *fdpath = NULL;
bool failed;
void (*resultfn)(const char *msg, ...) = ksft_test_result_pass;
void *copy = NULL, *how_copy = &how_ext;
if (!openat2_supported) {
ksft_print_msg("openat2(2) unsupported\n");
resultfn = ksft_test_result_skip;
goto skip;
}
if (misalign) {
/*
* Explicitly misalign the structure copying it with the given
* (mis)alignment offset. The other data is set to be non-zero to
* make sure that non-zero bytes outside the struct aren't checked
*
* This is effectively to check that is_zeroed_user() works.
*/
copy = malloc(misalign + sizeof(how_ext));
how_copy = copy + misalign;
memset(copy, 0xff, misalign);
memcpy(how_copy, &how_ext, sizeof(how_ext));
}
fd = raw_openat2(AT_FDCWD, ".", how_copy, test->size);
if (test->err >= 0)
failed = (fd < 0);
else
failed = (fd != test->err);
if (fd >= 0) {
fdpath = fdreadlink(fd);
close(fd);
}
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->err >= 0)
resultfn("openat2 with %s argument [misalign=%d] succeeds\n",
test->name, misalign);
else
resultfn("openat2 with %s argument [misalign=%d] fails with %d (%s)\n",
test->name, misalign, test->err,
strerror(-test->err));
free(copy);
free(fdpath);
fflush(stdout);
}
}
}
struct flag_test {
const char *name;
struct open_how how;
int err;
};
#define NUM_OPENAT2_FLAG_TESTS 25
void test_openat2_flags(void)
{
struct flag_test tests[] = {
/* O_TMPFILE is incompatible with O_PATH and O_CREAT. */
{ .name = "incompatible flags (O_TMPFILE | O_PATH)",
.how.flags = O_TMPFILE | O_PATH | O_RDWR, .err = -EINVAL },
{ .name = "incompatible flags (O_TMPFILE | O_CREAT)",
.how.flags = O_TMPFILE | O_CREAT | O_RDWR, .err = -EINVAL },
/* O_PATH only permits certain other flags to be set ... */
{ .name = "compatible flags (O_PATH | O_CLOEXEC)",
.how.flags = O_PATH | O_CLOEXEC },
{ .name = "compatible flags (O_PATH | O_DIRECTORY)",
.how.flags = O_PATH | O_DIRECTORY },
{ .name = "compatible flags (O_PATH | O_NOFOLLOW)",
.how.flags = O_PATH | O_NOFOLLOW },
/* ... and others are absolutely not permitted. */
{ .name = "incompatible flags (O_PATH | O_RDWR)",
.how.flags = O_PATH | O_RDWR, .err = -EINVAL },
{ .name = "incompatible flags (O_PATH | O_CREAT)",
.how.flags = O_PATH | O_CREAT, .err = -EINVAL },
{ .name = "incompatible flags (O_PATH | O_EXCL)",
.how.flags = O_PATH | O_EXCL, .err = -EINVAL },
{ .name = "incompatible flags (O_PATH | O_NOCTTY)",
.how.flags = O_PATH | O_NOCTTY, .err = -EINVAL },
{ .name = "incompatible flags (O_PATH | O_DIRECT)",
.how.flags = O_PATH | O_DIRECT, .err = -EINVAL },
{ .name = "incompatible flags (O_PATH | O_LARGEFILE)",
.how.flags = O_PATH | O_LARGEFILE, .err = -EINVAL },
/* ->mode must only be set with O_{CREAT,TMPFILE}. */
{ .name = "non-zero how.mode and O_RDONLY",
.how.flags = O_RDONLY, .how.mode = 0600, .err = -EINVAL },
{ .name = "non-zero how.mode and O_PATH",
.how.flags = O_PATH, .how.mode = 0600, .err = -EINVAL },
{ .name = "valid how.mode and O_CREAT",
.how.flags = O_CREAT, .how.mode = 0600 },
{ .name = "valid how.mode and O_TMPFILE",
.how.flags = O_TMPFILE | O_RDWR, .how.mode = 0600 },
/* ->mode must only contain 0777 bits. */
{ .name = "invalid how.mode and O_CREAT",
.how.flags = O_CREAT,
.how.mode = 0xFFFF, .err = -EINVAL },
{ .name = "invalid (very large) how.mode and O_CREAT",
.how.flags = O_CREAT,
.how.mode = 0xC000000000000000ULL, .err = -EINVAL },
{ .name = "invalid how.mode and O_TMPFILE",
.how.flags = O_TMPFILE | O_RDWR,
.how.mode = 0x1337, .err = -EINVAL },
{ .name = "invalid (very large) how.mode and O_TMPFILE",
.how.flags = O_TMPFILE | O_RDWR,
.how.mode = 0x0000A00000000000ULL, .err = -EINVAL },
/* ->resolve flags must not conflict. */
{ .name = "incompatible resolve flags (BENEATH | IN_ROOT)",
.how.flags = O_RDONLY,
.how.resolve = RESOLVE_BENEATH | RESOLVE_IN_ROOT,
.err = -EINVAL },
/* ->resolve must only contain RESOLVE_* flags. */
{ .name = "invalid how.resolve and O_RDONLY",
.how.flags = O_RDONLY,
.how.resolve = 0x1337, .err = -EINVAL },
{ .name = "invalid how.resolve and O_CREAT",
.how.flags = O_CREAT,
.how.resolve = 0x1337, .err = -EINVAL },
{ .name = "invalid how.resolve and O_TMPFILE",
.how.flags = O_TMPFILE | O_RDWR,
.how.resolve = 0x1337, .err = -EINVAL },
{ .name = "invalid how.resolve and O_PATH",
.how.flags = O_PATH,
.how.resolve = 0x1337, .err = -EINVAL },
/* currently unknown upper 32 bit rejected. */
{ .name = "currently unknown bit (1 << 63)",
.how.flags = O_RDONLY | (1ULL << 63),
.how.resolve = 0, .err = -EINVAL },
};
BUILD_BUG_ON(ARRAY_LEN(tests) != NUM_OPENAT2_FLAG_TESTS);
for (int i = 0; i < ARRAY_LEN(tests); i++) {
int fd, fdflags = -1;
char *path, *fdpath = NULL;
bool failed = false;
struct flag_test *test = &tests[i];
void (*resultfn)(const char *msg, ...) = ksft_test_result_pass;
if (!openat2_supported) {
ksft_print_msg("openat2(2) unsupported\n");
resultfn = ksft_test_result_skip;
goto skip;
}
path = (test->how.flags & O_CREAT) ? "/tmp/ksft.openat2_tmpfile" : ".";
unlink(path);
fd = sys_openat2(AT_FDCWD, path, &test->how);
if (test->err >= 0)
failed = (fd < 0);
else
failed = (fd != test->err);
if (fd >= 0) {
int otherflags;
fdpath = fdreadlink(fd);
fdflags = fcntl(fd, F_GETFL);
otherflags = fcntl(fd, F_GETFD);
close(fd);
E_assert(fdflags >= 0, "fcntl F_GETFL of new fd");
E_assert(otherflags >= 0, "fcntl F_GETFD of new fd");
/* O_CLOEXEC isn't shown in F_GETFL. */
if (otherflags & FD_CLOEXEC)
fdflags |= O_CLOEXEC;
/* O_CREAT is hidden from F_GETFL. */
if (test->how.flags & O_CREAT)
fdflags |= O_CREAT;
if (!(test->how.flags & O_LARGEFILE))
fdflags &= ~O_LARGEFILE;
failed |= (fdflags != test->how.flags);
}
if (failed) {
resultfn = ksft_test_result_fail;
ksft_print_msg("openat2 unexpectedly returned ");
if (fdpath)
ksft_print_msg("%d['%s'] with %X (!= %X)\n",
fd, fdpath, fdflags,
test->how.flags);
else
ksft_print_msg("%d (%s)\n", fd, strerror(-fd));
}
skip:
if (test->err >= 0)
resultfn("openat2 with %s succeeds\n", test->name);
else
resultfn("openat2 with %s fails with %d (%s)\n",
test->name, test->err, strerror(-test->err));
free(fdpath);
fflush(stdout);
}
}
#define NUM_TESTS (NUM_OPENAT2_STRUCT_VARIATIONS * NUM_OPENAT2_STRUCT_TESTS + \
NUM_OPENAT2_FLAG_TESTS)
int main(int argc, char **argv)
{
ksft_print_header();
ksft_set_plan(NUM_TESTS);
test_openat2_struct();
test_openat2_flags();
if (ksft_get_fail_cnt() + ksft_get_error_cnt() > 0)
ksft_exit_fail();
else
ksft_exit_pass();
}
|
