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| 2 | * Copyright © 2019 Alexey Dobriyan <[email protected]>
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| 3 | *
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| 4 | * Permission to use, copy, modify, and distribute this software for any
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| 5 | * purpose with or without fee is hereby granted, provided that the above
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| 6 | * copyright notice and this permission notice appear in all copies.
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| 7 | *
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| 8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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| 9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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| 10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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| 11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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| 12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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| 13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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| 14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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| 15 |
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| 16 | |
| 17 | * Test that setns(CLONE_NEWNET) points to new /proc/net content even
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| 18 | * if old one is in dcache.
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| 19 | *
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| 20 | * FIXME /proc/net/unix is under CONFIG_UNIX which can be disabled.
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| 21 |
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| 22 | #undef NDEBUG
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| 23 | #include <assert.h>
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| 24 | #include <errno.h>
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| 25 | #include <sched.h>
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| 26 | #include <signal.h>
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| 27 | #include <stdio.h>
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| 28 | #include <stdlib.h>
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| 29 | #include <string.h>
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| 30 | #include <unistd.h>
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| 31 | #include <sys/types.h>
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| 32 | #include <sys/stat.h>
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| 33 | #include <fcntl.h>
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| 34 | #include <sys/socket.h>
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| 35 |
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| 36 | static pid_t pid = -1;
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| 37 |
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| 38 | static void f(void)
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| 39 | {
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| 40 | if (pid > 0) {
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| 41 | kill(pid, SIGTERM);
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| 42 | }
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| 43 | }
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| 44 |
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| 45 | int main(void)
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| 46 | {
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| 47 | int fd[2];
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| 48 | char _ = 0;
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| 49 | int nsfd;
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| 50 |
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| 51 | atexit(f);
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| 52 |
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| 53 |
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| 54 | if (unshare(CLONE_NEWNET) == -1) {
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| 55 | if (errno == ENOSYS || errno == EPERM) {
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| 56 | return 4;
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| 57 | }
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| 58 | return 1;
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| 59 | }
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| 60 |
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| 61 | if (socket(AF_UNIX, SOCK_STREAM, 0) == -1) {
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| 62 | return 1;
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| 63 | }
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| 64 |
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| 65 | if (pipe(fd) == -1) {
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| 66 | return 1;
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| 67 | }
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| 68 |
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| 69 | pid = fork();
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| 70 | if (pid == -1) {
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| 71 | return 1;
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| 72 | }
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| 73 |
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| 74 | if (pid == 0) {
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| 75 | if (unshare(CLONE_NEWNET) == -1) {
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| 76 | return 1;
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| 77 | }
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| 78 |
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| 79 | if (write(fd[1], &_, 1) != 1) {
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| 80 | return 1;
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| 81 | }
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| 82 |
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| 83 | pause();
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| 84 |
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| 85 | return 0;
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| 86 | }
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| 87 |
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| 88 | if (read(fd[0], &_, 1) != 1) {
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| 89 | return 1;
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| 90 | }
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| 91 |
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| 92 | {
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| 93 | char buf[64];
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| 94 | snprintf(buf, sizeof(buf), "/proc/%u/ns/net", pid);
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| 95 | nsfd = open(buf, O_RDONLY);
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| 96 | if (nsfd == -1) {
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| 97 | return 1;
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| 98 | }
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| 99 | }
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| 100 |
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| 101 |
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| 102 | (void)open("/proc/net/unix", O_RDONLY);
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| 103 |
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| 104 | if (setns(nsfd, CLONE_NEWNET) == -1) {
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| 105 | return 1;
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| 106 | }
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| 107 |
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| 108 | kill(pid, SIGTERM);
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| 109 | pid = 0;
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| 110 |
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| 111 | {
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| 112 | char buf[4096];
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| 113 | ssize_t rv;
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| 114 | int fd;
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| 115 |
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| 116 | fd = open("/proc/net/unix", O_RDONLY);
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| 117 | if (fd == -1) {
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| 118 | return 1;
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| 119 | }
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| 120 |
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| 121 | #define S "Num RefCount Protocol Flags Type St Inode Path\n"
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| 122 | rv = read(fd, buf, sizeof(buf));
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| 123 |
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| 124 | assert(rv == strlen(S));
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| 125 | assert(memcmp(buf, S, strlen(S)) == 0);
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| 126 | }
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| 127 |
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| 128 | return 0;
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| 129 | }
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