1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
/*
* Check decoding of SCM_PIDFD control messages.
*
* Copyright (c) 2023 Dmitry V. Levin <ldv@strace.io>
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#define XLAT_MACROS_ONLY
# include "xlat/scmvals.h"
#undef XLAT_MACROS_ONLY
int
main(void)
{
skip_if_unavailable("/proc/self/fd/");
int pv[2];
if (socketpair(AF_UNIX, SOCK_STREAM, 0, pv))
perror_msg_and_skip("socketpair AF_UNIX SOCK_STREAM");
if (close(pv[1]))
perror_msg_and_fail("close");
int sv[2];
if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv))
perror_msg_and_skip("socketpair AF_UNIX SOCK_STREAM");
if (close(sv[1]))
perror_msg_and_fail("close");
unsigned int cmsg_size = CMSG_SPACE(sizeof(pv[0]));
struct cmsghdr *cmsg = tail_alloc(cmsg_size);
cmsg->cmsg_len = cmsg_size;
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_PIDFD;
memcpy(CMSG_DATA(cmsg), pv, sizeof(pv[0]));
char sym = 'A';
struct iovec iov = {
.iov_base = &sym,
.iov_len = sizeof(sym)
};
struct msghdr mh = {
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = cmsg,
.msg_controllen = cmsg_size
};
recvmsg(sv[0], &mh, 0);
printf("recvmsg(%d<socket:[%lu]>, {msg_name=NULL, msg_namelen=0"
", msg_iov=[{iov_base=\"A\", iov_len=1}], msg_iovlen=1"
", msg_control=[{cmsg_len=%u, cmsg_level=SOL_SOCKET"
", cmsg_type=SCM_PIDFD, cmsg_data=%d<socket:[%lu]>}]"
", msg_controllen=%u, msg_flags=0}, 0) = 1 (INJECTED)\n",
sv[0], inode_of_sockfd(sv[0]), cmsg_size,
pv[0], inode_of_sockfd(pv[0]), cmsg_size);
puts("+++ exited with 0 +++");
return 0;
}
|
