tools/testing/selftests/pidfd/pidfd_xattr_test.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/pidfd/pidfd_xattr_test.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/pidfd/pidfd_xattr_test.c
Extension
.c
Size
3439 bytes
Lines
133
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0

#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <linux/types.h>
#include <poll.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syscall.h>
#include <sys/prctl.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sys/socket.h>
#include <linux/kcmp.h>
#include <sys/stat.h>
#include <sys/xattr.h>

#include "pidfd.h"
#include "kselftest_harness.h"

FIXTURE(pidfs_xattr)
{
	pid_t child_pid;
	int child_pidfd;
};

FIXTURE_SETUP(pidfs_xattr)
{
	self->child_pid = create_child(&self->child_pidfd, CLONE_NEWUSER | CLONE_NEWPID);
	EXPECT_GE(self->child_pid, 0);

	if (self->child_pid == 0)
		_exit(EXIT_SUCCESS);
}

FIXTURE_TEARDOWN(pidfs_xattr)
{
	sys_waitid(P_PID, self->child_pid, NULL, WEXITED);
}

TEST_F(pidfs_xattr, set_get_list_xattr_multiple)
{
	int ret, i;
	char xattr_name[32];
	char xattr_value[32];
	char buf[32];
	const int num_xattrs = 10;
	char list[PATH_MAX] = {};

	for (i = 0; i < num_xattrs; i++) {
		snprintf(xattr_name, sizeof(xattr_name), "trusted.testattr%d", i);
		snprintf(xattr_value, sizeof(xattr_value), "testvalue%d", i);
		ret = fsetxattr(self->child_pidfd, xattr_name, xattr_value, strlen(xattr_value), 0);
		ASSERT_EQ(ret, 0);
	}

	for (i = 0; i < num_xattrs; i++) {
		snprintf(xattr_name, sizeof(xattr_name), "trusted.testattr%d", i);
		snprintf(xattr_value, sizeof(xattr_value), "testvalue%d", i);
		memset(buf, 0, sizeof(buf));
		ret = fgetxattr(self->child_pidfd, xattr_name, buf, sizeof(buf));
		ASSERT_EQ(ret, strlen(xattr_value));
		ASSERT_EQ(strcmp(buf, xattr_value), 0);
	}

	ret = flistxattr(self->child_pidfd, list, sizeof(list));
	ASSERT_GT(ret, 0);
	for (i = 0; i < num_xattrs; i++) {
		snprintf(xattr_name, sizeof(xattr_name), "trusted.testattr%d", i);
		bool found = false;
		for (char *it = list; it < list + ret; it += strlen(it) + 1) {
			if (strcmp(it, xattr_name))
				continue;
			found = true;
			break;
		}
		ASSERT_TRUE(found);
	}

	for (i = 0; i < num_xattrs; i++) {
		snprintf(xattr_name, sizeof(xattr_name), "trusted.testattr%d", i);
		ret = fremovexattr(self->child_pidfd, xattr_name);
		ASSERT_EQ(ret, 0);

Annotation

Implementation Notes