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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
selftests/pidfd: test extended attribute support
Add tests for extended attribute support on pidfds.
Link: https://lore.kernel.org/20250618-work-pidfs-persistent-v2-13-98f3456fd552@kernel.org
Reviewed-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
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tools/testing/selftests/pidfd/.gitignore
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tools/testing/selftests/pidfd/.gitignore
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tools/testing/selftests/pidfd/Makefile
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tools/testing/selftests/pidfd/Makefile
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TEST_GEN_PROGS := pidfd_test pidfd_fdinfo_test pidfd_open_test \
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pidfd_poll_test pidfd_wait pidfd_getfd_test pidfd_setns_test \
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pidfd_file_handle_test pidfd_bind_mount pidfd_info_test
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pidfd_file_handle_test pidfd_bind_mount pidfd_info_test \
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pidfd_xattr_test
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TEST_GEN_PROGS_EXTENDED := pidfd_exec_helper
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tools/testing/selftests/pidfd/pidfd_xattr_test.c
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tools/testing/selftests/pidfd/pidfd_xattr_test.c
···
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// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <linux/types.h>
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#include <poll.h>
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#include <pthread.h>
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#include <sched.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syscall.h>
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#include <sys/prctl.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <linux/kcmp.h>
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#include <sys/stat.h>
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#include <sys/xattr.h>
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#include "pidfd.h"
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#include "../kselftest_harness.h"
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FIXTURE(pidfs_xattr)
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{
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pid_t child_pid;
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int child_pidfd;
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};
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FIXTURE_SETUP(pidfs_xattr)
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{
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self->child_pid = create_child(&self->child_pidfd, CLONE_NEWUSER | CLONE_NEWPID);
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EXPECT_GE(self->child_pid, 0);
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if (self->child_pid == 0)
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_exit(EXIT_SUCCESS);
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}
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FIXTURE_TEARDOWN(pidfs_xattr)
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{
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sys_waitid(P_PID, self->child_pid, NULL, WEXITED);
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}
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TEST_F(pidfs_xattr, set_get_list_xattr_multiple)
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{
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int ret, i;
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char xattr_name[32];
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char xattr_value[32];
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char buf[32];
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const int num_xattrs = 10;
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char list[PATH_MAX] = {};
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for (i = 0; i < num_xattrs; i++) {
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snprintf(xattr_name, sizeof(xattr_name), "trusted.testattr%d", i);
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snprintf(xattr_value, sizeof(xattr_value), "testvalue%d", i);
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ret = fsetxattr(self->child_pidfd, xattr_name, xattr_value, strlen(xattr_value), 0);
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ASSERT_EQ(ret, 0);
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}
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for (i = 0; i < num_xattrs; i++) {
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snprintf(xattr_name, sizeof(xattr_name), "trusted.testattr%d", i);
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snprintf(xattr_value, sizeof(xattr_value), "testvalue%d", i);
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memset(buf, 0, sizeof(buf));
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ret = fgetxattr(self->child_pidfd, xattr_name, buf, sizeof(buf));
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ASSERT_EQ(ret, strlen(xattr_value));
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ASSERT_EQ(strcmp(buf, xattr_value), 0);
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}
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ret = flistxattr(self->child_pidfd, list, sizeof(list));
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ASSERT_GT(ret, 0);
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for (i = 0; i < num_xattrs; i++) {
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snprintf(xattr_name, sizeof(xattr_name), "trusted.testattr%d", i);
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bool found = false;
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for (char *it = list; it < list + ret; it += strlen(it) + 1) {
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if (strcmp(it, xattr_name))
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continue;
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found = true;
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break;
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}
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ASSERT_TRUE(found);
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}
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for (i = 0; i < num_xattrs; i++) {
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snprintf(xattr_name, sizeof(xattr_name), "trusted.testattr%d", i);
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ret = fremovexattr(self->child_pidfd, xattr_name);
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ASSERT_EQ(ret, 0);
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ret = fgetxattr(self->child_pidfd, xattr_name, buf, sizeof(buf));
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ASSERT_EQ(ret, -1);
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ASSERT_EQ(errno, ENODATA);
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}
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}
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TEST_HARNESS_MAIN