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c0329020da
Add tests for the new O_EMPTYPATH flag of openat(2)/openat2(2). Also, the current openat2 tests include a helper header file that defines the necessary structs and constants to use openat2(2), such as struct open_how. This may result in conflicting definitions when the system header openat2.h is present as well. So add openat2.h generated by 'make headers' to the uapi header files in ./tools/include and remove the helper file definitions of the current openat2 selftests. Signed-off-by: Jori Koolstra <jkoolstra@xs4all.nl> Link: https://patch.msgid.link/20260424114611.1678641-3-jkoolstra@xs4all.nl Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
136 lines
2.8 KiB
C
136 lines
2.8 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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* Copyright (C) 2026 Amutable GmbH
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*/
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#ifndef __RESOLVEAT_H__
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#define __RESOLVEAT_H__
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#define _GNU_SOURCE
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#include <stdint.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <limits.h>
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#include <linux/types.h>
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#include <linux/unistd.h>
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#include <linux/openat2.h>
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#include "kselftest_harness.h"
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#define BUILD_BUG_ON(e) ((void)(sizeof(struct { int:(-!!(e)); })))
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#define OPEN_HOW_SIZE_VER0 24 /* sizeof first published struct */
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#define OPEN_HOW_SIZE_LATEST OPEN_HOW_SIZE_VER0
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__maybe_unused
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static bool needs_openat2(const struct open_how *how)
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{
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return how->resolve != 0;
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}
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__maybe_unused
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static int raw_openat2(int dfd, const char *path, void *how, size_t size)
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{
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int ret = syscall(__NR_openat2, dfd, path, how, size);
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return ret >= 0 ? ret : -errno;
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}
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__maybe_unused
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static int sys_openat2(int dfd, const char *path, struct open_how *how)
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{
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return raw_openat2(dfd, path, how, sizeof(*how));
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}
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__maybe_unused
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static int sys_openat(int dfd, const char *path, struct open_how *how)
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{
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int ret = openat(dfd, path, how->flags, how->mode);
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return ret >= 0 ? ret : -errno;
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}
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__maybe_unused
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static int sys_renameat2(int olddirfd, const char *oldpath,
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int newdirfd, const char *newpath, unsigned int flags)
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{
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int ret = syscall(__NR_renameat2, olddirfd, oldpath,
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newdirfd, newpath, flags);
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return ret >= 0 ? ret : -errno;
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}
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__maybe_unused
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static int touchat(int dfd, const char *path)
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{
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int fd = openat(dfd, path, O_CREAT, 0700);
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if (fd >= 0)
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close(fd);
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return fd;
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}
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__maybe_unused
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static char *fdreadlink(struct __test_metadata *_metadata, int fd)
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{
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char *target, *tmp;
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ASSERT_GT(asprintf(&tmp, "/proc/self/fd/%d", fd), 0);
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target = malloc(PATH_MAX);
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ASSERT_NE(target, NULL);
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memset(target, 0, PATH_MAX);
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ASSERT_GT(readlink(tmp, target, PATH_MAX), 0);
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free(tmp);
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return target;
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}
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__maybe_unused
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static bool fdequal(struct __test_metadata *_metadata, int fd,
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int dfd, const char *path)
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{
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char *fdpath, *dfdpath, *other;
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bool cmp;
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fdpath = fdreadlink(_metadata, fd);
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dfdpath = fdreadlink(_metadata, dfd);
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if (!path) {
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ASSERT_GT(asprintf(&other, "%s", dfdpath), 0);
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} else if (*path == '/') {
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ASSERT_GT(asprintf(&other, "%s", path), 0);
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} else {
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ASSERT_GT(asprintf(&other, "%s/%s", dfdpath, path), 0);
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}
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cmp = !strcmp(fdpath, other);
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free(fdpath);
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free(dfdpath);
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free(other);
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return cmp;
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}
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static bool openat2_supported = false;
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__attribute__((constructor))
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static void __detect_openat2_supported(void)
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{
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struct open_how how = {};
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int fd;
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BUILD_BUG_ON(sizeof(struct open_how) != OPEN_HOW_SIZE_VER0);
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/* Check openat2(2) support. */
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fd = sys_openat2(AT_FDCWD, ".", &how);
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openat2_supported = (fd >= 0);
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if (fd >= 0)
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close(fd);
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}
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#endif /* __RESOLVEAT_H__ */
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