113 lines
2.7 KiB
C
113 lines
2.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2022 FUJITSU LIMITED. All rights reserved.
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* Author: Yang Xu <xuyang2018.jy@fujitsu.com>
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*/
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/*\
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* [Description]
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*
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* Tests basic error handling of the pidfd_open syscall.
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*
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* - EBADF pidfd is not a valid PID file descriptor
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* - EBADF targetfd is not an open file descriptor in the process referred
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* to by pidfd
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* - EINVAL flags is not 0
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* - ESRCH the process referred to by pidfd does not exist (it has terminated
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* and been waited on)
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* - EPERM the calling process doesn't have PTRACE_MODE_ATTACH_REALCREDS permissions
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* over the process referred to by pidfd
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*/
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#include <stdlib.h>
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#include <pwd.h>
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#include "tst_test.h"
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#include "tst_safe_macros.h"
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#include "lapi/pidfd.h"
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static int valid_pidfd = -1, invalid_pidfd = -1, pidfd = -1;
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static uid_t uid;
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static struct tcase {
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char *name;
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int *pidfd;
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int targetfd;
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int flags;
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int exp_errno;
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} tcases[] = {
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{"invalid pidfd", &invalid_pidfd, 0, 0, EBADF},
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{"invalid targetfd", &valid_pidfd, -1, 0, EBADF},
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{"invalid flags", &valid_pidfd, 0, 1, EINVAL},
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{"the process referred to by pidfd doesn't exist", NULL, 0, 0, ESRCH},
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{"lack of required permission", &valid_pidfd, 0, 0, EPERM},
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};
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static void setup(void)
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{
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pidfd_open_supported();
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pidfd_getfd_supported();
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struct passwd *pw;
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pw = SAFE_GETPWNAM("nobody");
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uid = pw->pw_uid;
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valid_pidfd = SAFE_PIDFD_OPEN(getpid(), 0);
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}
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static void cleanup(void)
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{
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if (valid_pidfd > -1)
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SAFE_CLOSE(valid_pidfd);
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if (pidfd > -1)
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SAFE_CLOSE(pidfd);
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}
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static void run(unsigned int n)
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{
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struct tcase *tc = &tcases[n];
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int pid;
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if (tc->exp_errno == EPERM) {
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pid = SAFE_FORK();
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if (!pid) {
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SAFE_SETUID(uid);
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TST_EXP_FAIL2(pidfd_getfd(valid_pidfd, tc->targetfd, tc->flags),
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tc->exp_errno, "pidfd_getfd(%d, %d, %d) with %s",
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valid_pidfd, tc->targetfd, tc->flags, tc->name);
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TST_CHECKPOINT_WAKE(0);
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exit(0);
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}
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TST_CHECKPOINT_WAIT(0);
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SAFE_WAIT(NULL);
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return;
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} else if (tc->exp_errno == ESRCH) {
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pid = SAFE_FORK();
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if (!pid) {
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TST_CHECKPOINT_WAIT(0);
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exit(0);
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}
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pidfd = SAFE_PIDFD_OPEN(pid, 0);
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TST_CHECKPOINT_WAKE(0);
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SAFE_WAIT(NULL);
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TST_EXP_FAIL2(pidfd_getfd(pidfd, tc->targetfd, tc->flags),
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tc->exp_errno, "pidfd_getfd(%d, %d, %d) with %s",
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pidfd, tc->targetfd, tc->flags, tc->name);
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SAFE_CLOSE(pidfd);
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} else {
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TST_EXP_FAIL2(pidfd_getfd(*tc->pidfd, tc->targetfd, tc->flags),
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tc->exp_errno, "pidfd_getfd(%d, %d, %d) with %s",
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*tc->pidfd, tc->targetfd, tc->flags, tc->name);
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}
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}
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static struct tst_test test = {
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.tcnt = ARRAY_SIZE(tcases),
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.test = run,
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.setup = setup,
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.cleanup = cleanup,
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.needs_root = 1,
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.forks_child = 1,
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.needs_checkpoints = 1,
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};
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