xref: /third_party/musl/libc-test/src/functionalext/fortify/poll.c

/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include <errno.h>
#include <poll.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sigchain.h>
#include "fortify_test.h"
#include "functionalext.h"
#include "test.h"

#define PPOLL_TIMESPEC_NSEC (100)

/**
 * @tc.name     : poll_0010
 * @tc.desc     : test poll normal condition
 * @tc.level    : Level 0
 */
static void poll_0010(void)
{
    errno = 0;
    TEST(poll(NULL, 0, 1) == 0);
    TEST(errno == 0);
    return;
}

/**
 * @tc.name     : poll_0020
 * @tc.desc     : test poll suppress compiler optimizations
 * @tc.level    : Level 2
 */
static void poll_0020(void)
{
    struct sigaction sigabrt = {
        .sa_handler = SignalHandler,
    };
    sigaction(SIGABRT, &sigabrt, NULL);

    nfds_t fd_count = atoi("2");
    struct pollfd buf[1] = {{0, POLLIN, 0}};

    int status;
    int pid = fork();
    switch (pid) {
        case -1:
            t_error("fork failed: %s\n", strerror(errno));
            break;
        case 0:
            // Set timeout to 0 to prevent waiting for polling if hardening tests fail.
            poll(buf, fd_count, 0);
            exit(0);
        default:
            waitpid(pid, &status, WUNTRACED);
            TEST(WIFEXITED(status) == 0);
            TEST(WIFSTOPPED(status) == 1);
            TEST(WSTOPSIG(status) == SIGSTOP);
            kill(pid, SIGCONT);
            break;
    }

    return;
}

/**
 * @tc.name     : poll_0030
 * @tc.desc     : test poll with buf's size greater than fd_count, return fd_count
 * @tc.level    : Level 1
 */
static void poll_0030(void)
{
    int fd[2];
    int res = pipe(fd);
    if (res != 0) {
        EXPECT_TRUE("poll_0030 pipe", 0);
    }
    int pid = fork();
    if (pid == -1) {
        EXPECT_TRUE("poll_0030 fork", 0);
    } else if (pid == 0) {
        // child process: send msg to master process
        close(fd[0]);
        const char* message = "";
        write(fd[1], message, strlen(message) + 1);
        close(fd[1]);
        exit(0);
    } else {
        // master process: wait events from child process
        close(fd[1]);
        struct pollfd buf[2] = {{fd[0], POLLIN, 0}, {fd[0], POLLIN, 0}};
        int result = poll(buf, 1, 100);
        char buff;
        while (read(fd[0], &buff, 1) > 0);
        close(fd[0]);
        EXPECT_EQ("poll_0030", result, 1);
    }
    return;
}


#ifdef _GNU_SOURCE
/**
 * @tc.name     : ppoll_0010
 * @tc.desc     : test ppoll normal condition
 * @tc.level    : Level 0
 */
static void ppoll_0010(void)
{
    errno = 0;
    struct timespec ts = { .tv_nsec = PPOLL_TIMESPEC_NSEC };
    TEST(ppoll(NULL, 0, &ts, NULL) == 0);
    TEST(errno == 0);
    return;
}

/**
 * @tc.name     : ppoll_0020
 * @tc.desc     : test ppoll suppress compiler optimizations
 * @tc.level    : Level 2
 */
static void ppoll_0020(void)
{
    struct sigaction sigabrt = {
        .sa_handler = SignalHandler,
    };
    sigaction(SIGABRT, &sigabrt, NULL);

    nfds_t fd_count = atoi("2");
    struct pollfd buf[1] = {{0, POLLIN, 0}};
    // Set timeout to zero to prevent waiting in ppoll when fortify test fails.
    struct timespec timeout;
    timeout.tv_sec = timeout.tv_nsec = 0;

    int status;
    int pid = fork();
    switch (pid) {
        case -1:
            t_error("fork failed: %s\n", strerror(errno));
            break;
        case 0:
            ppoll(buf, fd_count, &timeout, NULL);
            exit(0);
        default:
            waitpid(pid, &status, WUNTRACED);
            TEST(WIFEXITED(status) == 0);
            TEST(WIFSTOPPED(status) == 1);
            TEST(WSTOPSIG(status) == SIGSTOP);
            kill(pid, SIGCONT);
            break;
    }

    return;
}

/**
 * @tc.name     : ppoll_0030
 * @tc.desc     : test poll with buf's size greater than fd_count, return fd_count
 * @tc.level    : Level 1
 */
static void ppoll_0030(void)
{

    int fd[2];
    int res = pipe(fd);
    if (res != 0) {
        EXPECT_TRUE("poll_0030 pipe", 0);
    }
    int pid = fork();
    if (pid == -1) {
        EXPECT_TRUE("poll_0030 fork", 0);
    } else if (pid == 0) {
        // child process: send msg to master process
        close(fd[0]);
        const char* message = "";
        write(fd[1], message, strlen(message) + 1);
        close(fd[1]);
        exit(0);
    } else {
        // master process: wait events from child process
        close(fd[1]);
        struct pollfd buf[2] = {{fd[0], POLLIN, 0}, {fd[0], POLLIN, 0}};
        struct timespec ts = { .tv_nsec = 100000000 };
        int result = ppoll(buf, 1, &ts, NULL);
        char buff;
        while (read(fd[0], &buff, 1) > 0);
        close(fd[0]);
        EXPECT_EQ("ppoll_0030", result, 1);
    }
    return;
}

#endif

int main(int argc, char *argv[]) {
    remove_all_special_handler(SIGABRT);
    poll_0010();
    poll_0020();
    poll_0030();
#ifdef _GNU_SOURCE
    ppoll_0010();
    ppoll_0020();
    ppoll_0030();
#endif

    return t_status;
}