tests: check decoding of msghdr.msg_name* arguments of recvmsg syscall
* tests/msg_name.c: New file. * tests/msg_name.test: New test. * tests/.gitignore: Add msg_name. * tests/Makefile.am (check_PROGRAMS): Likewise. (DECODER_TESTS): Add msg_name.test.
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tests/.gitignore
vendored
1
tests/.gitignore
vendored
@ -143,6 +143,7 @@ move_pages
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mq
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msg_control
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msg_control-v
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msg_name
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munlockall
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nanosleep
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net-accept-connect
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@ -197,6 +197,7 @@ check_PROGRAMS = \
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mq \
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msg_control \
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msg_control-v \
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msg_name \
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munlockall \
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nanosleep \
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net-accept-connect \
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@ -517,6 +518,7 @@ DECODER_TESTS = \
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mq.test \
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msg_control.test \
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msg_control-v.test \
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msg_name.test \
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munlockall.test \
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nanosleep.test \
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net-icmp_filter.test \
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150
tests/msg_name.c
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150
tests/msg_name.c
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@ -0,0 +1,150 @@
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/*
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* Check decoding of struct msghdr.msg_name* arguments of recvmsg syscall.
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*
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* Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "tests.h"
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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static int
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send_recv(const int send_fd, const int recv_fd,
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struct msghdr *const msg, const int flags)
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{
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if (send(send_fd, "A", 1, 0) != 1)
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perror_msg_and_skip("send");
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return recvmsg(recv_fd, msg, flags);
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}
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static void
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test_msg_name(const int send_fd, const int recv_fd)
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{
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char *const recv_buf = tail_alloc(sizeof(*recv_buf));
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struct iovec *const iov = tail_alloc(sizeof(*iov));
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iov->iov_base = recv_buf;
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iov->iov_len = sizeof(*recv_buf);
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struct sockaddr_un *const addr = tail_alloc(sizeof(*addr));
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struct msghdr *const msg = tail_alloc(sizeof(*msg));
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msg->msg_name = addr;
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msg->msg_namelen = sizeof(*addr);
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msg->msg_iov = iov;
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msg->msg_iovlen = 1;
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msg->msg_control = 0;
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msg->msg_controllen = 0;
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msg->msg_flags = 0;
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int rc = send_recv(send_fd, recv_fd, msg, MSG_DONTWAIT);
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if (rc < 0)
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perror_msg_and_skip("recvmsg");
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printf("recvmsg(%d, {msg_name={sa_family=AF_UNIX, sun_path=\"%s\"}"
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", msg_namelen=%d->%d, msg_iov=[{\"A\", 1}], msg_iovlen=1"
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", msg_controllen=0, msg_flags=0}, MSG_DONTWAIT) = %d\n",
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recv_fd, addr->sun_path, (int) sizeof(struct sockaddr_un),
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(int) msg->msg_namelen, rc);
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memset(addr, 0, sizeof(*addr));
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rc = send_recv(send_fd, recv_fd, msg, MSG_DONTWAIT);
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printf("recvmsg(%d, {msg_name={sa_family=AF_UNIX, sun_path=\"%s\"}"
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", msg_namelen=%d, msg_iov=[{\"A\", 1}], msg_iovlen=1"
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", msg_controllen=0, msg_flags=0}, MSG_DONTWAIT) = %d\n",
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recv_fd, addr->sun_path, (int) msg->msg_namelen, rc);
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msg->msg_name = 0;
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rc = send_recv(send_fd, recv_fd, msg, MSG_DONTWAIT);
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printf("recvmsg(%d, {msg_name=NULL"
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", msg_namelen=%d, msg_iov=[{\"A\", 1}], msg_iovlen=1"
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", msg_controllen=0, msg_flags=0}, MSG_DONTWAIT) = %d\n",
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recv_fd, (int) msg->msg_namelen, rc);
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const size_t offsetof_sun_path = offsetof(struct sockaddr_un, sun_path);
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msg->msg_name = addr;
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msg->msg_namelen = offsetof_sun_path;
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memset(addr->sun_path, 'A', sizeof(addr->sun_path));
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rc = send_recv(send_fd, recv_fd, msg, MSG_DONTWAIT);
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printf("recvmsg(%d, {msg_name={sa_family=AF_UNIX}"
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", msg_namelen=%d->%d, msg_iov=[{\"A\", 1}], msg_iovlen=1"
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", msg_controllen=0, msg_flags=0}, MSG_DONTWAIT) = %d\n",
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recv_fd, (int) offsetof_sun_path, (int) msg->msg_namelen, rc);
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msg->msg_namelen = sizeof(struct sockaddr);
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msg->msg_name = ((void *) (addr + 1)) - msg->msg_namelen;
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rc = send_recv(send_fd, recv_fd, msg, MSG_DONTWAIT);
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printf("recvmsg(%d, {msg_name={sa_family=AF_UNIX, sun_path=\"%.*s\"}"
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", msg_namelen=%d->%d, msg_iov=[{\"A\", 1}], msg_iovlen=1"
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", msg_controllen=0, msg_flags=0}, MSG_DONTWAIT) = %d\n",
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recv_fd, (int) (sizeof(struct sockaddr) - offsetof_sun_path),
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((struct sockaddr_un *) msg->msg_name)->sun_path,
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(int) sizeof(struct sockaddr), (int) msg->msg_namelen, rc);
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rc = send_recv(send_fd, recv_fd, msg, MSG_DONTWAIT);
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printf("recvmsg(%d, {msg_namelen=%d}, MSG_DONTWAIT) = %d %s (%m)\n",
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recv_fd, (int) msg->msg_namelen, rc, errno2name());
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/*
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* When recvmsg is called with a valid descriptor
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* but inaccessible memory, it causes segfaults on some architectures.
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* As in these cases we test decoding of failed recvmsg calls,
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* it's ok to fail recvmsg with any reason as long as
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* it doesn't read that inaccessible memory.
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*/
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rc = send_recv(send_fd, -1, msg + 1, 0);
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printf("recvmsg(-1, %p, 0) = %d %s (%m)\n",
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msg + 1, rc, errno2name());
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rc = send_recv(send_fd, -1, 0, 0);
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printf("recvmsg(-1, NULL, 0) = %d %s (%m)\n",
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rc, errno2name());
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}
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int
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main(void)
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{
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int fds[2];
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds))
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perror_msg_and_skip("socketpair");
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const struct sockaddr_un un = {
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.sun_family = AF_UNIX,
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.sun_path = "msg_name-recvmsg.test.send.socket"
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};
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(void) unlink(un.sun_path);
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if (bind(fds[1], (const void *) &un, sizeof(un)))
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perror_msg_and_skip("bind");
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(void) unlink(un.sun_path);
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test_msg_name(fds[1], fds[0]);
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puts("+++ exited with 0 +++");
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return 0;
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}
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6
tests/msg_name.test
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6
tests/msg_name.test
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@ -0,0 +1,6 @@
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#!/bin/sh
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# Check decoding of struct msghdr.msg_name* arguments of recvmsg syscall.
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. "${srcdir=.}/init.sh"
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run_strace_match_diff -a20 -e trace=recvmsg
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