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
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/* Basic tests for Linux process_madvise.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <array_length.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <support/check.h>
#include <support/process_state.h>
#include <support/support.h>
#include <support/xsocket.h>
#include <support/xunistd.h>
#include <sys/mman.h>
#include <sys/pidfd.h>
#include <sys/wait.h>
/* The pair of sockets used for coordination. The subprocess uses
sockets[1]. */
static int sockets[2];
static long int page_size;
static void
exit_subprocess (int dummy)
{
exit (EXIT_FAILURE);
}
static void
subprocess (void)
{
/* In case something goes wrong with parent before pidfd_send_signal. */
support_create_timer (5, 0, false, exit_subprocess);
void *p1 = xmmap (NULL, page_size * 2, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1);
void *p2 = xmmap (NULL, page_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1);
xmunmap(p2, page_size);
xsendto (sockets[1], &(struct iovec) { p1, page_size * 2 },
sizeof (struct iovec), 0, NULL, 0);
xsendto (sockets[1], &(struct iovec) { p2, page_size },
sizeof (struct iovec), 0, NULL, 0);
pause ();
_exit (0);
}
static int
do_test (void)
{
page_size = sysconf (_SC_PAGE_SIZE);
{
int r = pidfd_open (-1, 0);
TEST_COMPARE (r, -1);
if (errno == ENOSYS)
FAIL_UNSUPPORTED ("kernel does not support pidfd_open, skipping test");
TEST_COMPARE (errno, EINVAL);
}
TEST_COMPARE (socketpair (AF_UNIX, SOCK_STREAM, 0, sockets), 0);
pid_t pid = xfork ();
if (pid == 0)
{
xclose (sockets[0]);
subprocess ();
}
xclose (sockets[1]);
int pidfd = pidfd_open (pid, 0);
TEST_VERIFY (pidfd != -1);
/* The target process is going to send us two iovec's. The first one points
to a valid mapping, the other points to a previously valid mapping which
has now been unmapped. */
{
struct iovec iv;
xrecvfrom (sockets[0], &iv, sizeof (iv), 0, NULL, 0);
/* We expect this to succeed in the target process because the mapping
is valid. */
ssize_t ret = process_madvise (pidfd, &iv, 1, MADV_COLD, 0);
if (ret == -1 && errno == ENOSYS)
FAIL_UNSUPPORTED ("kernel does not support process_madvise, skipping"
"test");
TEST_COMPARE (ret, 2 * page_size);
}
{
struct iovec iv;
xrecvfrom (sockets[0], &iv, sizeof (iv), 0, NULL, 0);
/* We expect this to fail in the target process because the second iovec
points to an unmapped region. The target process arranges for this to
be the case. */
TEST_COMPARE (process_madvise (pidfd, &iv, 1, MADV_COLD, 0), -1);
TEST_COMPARE (errno, ENOMEM);
}
{
struct iovec iv[IOV_MAX + 1];
TEST_COMPARE (process_madvise (pidfd, iv, array_length (iv), MADV_COLD,
0), -1);
TEST_COMPARE (errno, EINVAL);
}
TEST_COMPARE (pidfd_send_signal (pidfd, SIGKILL, NULL, 0), 0);
{
siginfo_t info;
int r = waitid (P_PIDFD, pidfd, &info, WEXITED);
TEST_COMPARE (r, 0);
TEST_COMPARE (info.si_status, SIGKILL);
TEST_COMPARE (info.si_code, CLD_KILLED);
}
TEST_COMPARE (pidfd_send_signal (pidfd, SIGKILL, NULL, 0), -1);
TEST_COMPARE (errno, ESRCH);
return 0;
}
#include <support/test-driver.c>
|
