2 * Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com>
4 * SPDX-License-Identifier: LGPL-2.1-only
19 #include <sys/types.h>
23 #include <common/compat/tid.h>
24 #include <common/macros.h>
26 #include "signal-helper.h"
29 #define LTTNG_PROC_NS_PATH_MAX 40
32 * The runner of this test validates that the kernel supports the
33 * namespace for which it is invoked. However, these defines are added
34 * to allow tests to run on systems that support a given namespace,
35 * but that use a libc that doesn't define its associated clone flag.
38 #define CLONE_NEWNS 0x00020000
40 #ifndef CLONE_NEWCGROUP
41 #define CLONE_NEWCGROUP 0x02000000
44 #define CLONE_NEWUTS 0x04000000
47 #define CLONE_NEWIPC 0x08000000
50 #define CLONE_NEWUSER 0x10000000
53 #define CLONE_NEWPID 0x20000000
56 #define CLONE_NEWNET 0x40000000
59 #define CLONE_NEWTIME 0x00000080
63 static char *ns_opt
= NULL
;
64 static char *before_unshare_wait_file_path
= NULL
;
65 static char *after_unshare_wait_file_path
= NULL
;
66 static char *after_unshare_signal_file_path
= NULL
;
68 static struct poptOption opts
[] = {
69 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
70 { "debug", 'd', POPT_ARG_NONE
, &debug
, 0, "Enable debug output", NULL
},
71 { "ns", 'n', POPT_ARG_STRING
, &ns_opt
, 0, "Namespace short identifier", NULL
},
72 { "before", 'b', POPT_ARG_STRING
, &before_unshare_wait_file_path
, 0, "Wait for file before unshare", NULL
},
73 { "after", 'a', POPT_ARG_STRING
, &after_unshare_wait_file_path
, 0, "Wait for file after unshare", NULL
},
74 { "signal", 's', POPT_ARG_STRING
, &after_unshare_signal_file_path
, 0, "Create signal file after unshare", NULL
},
76 { NULL
, 0, 0, NULL
, 0, NULL
, NULL
}
79 static ATTR_FORMAT_PRINTF(1, 2)
80 void debug_printf(const char *format
, ...)
83 va_start(args
, format
);
86 vfprintf(stderr
, format
, args
);
92 static int get_ns_inum(const char *ns
, ino_t
*ns_inum
)
96 char proc_ns_path
[LTTNG_PROC_NS_PATH_MAX
];
99 * /proc/thread-self was introduced in kernel v3.17
101 if (snprintf(proc_ns_path
, LTTNG_PROC_NS_PATH_MAX
,
102 "/proc/thread-self/ns/%s", ns
) >= 0) {
103 if (stat(proc_ns_path
, &sb
) == 0) {
104 *ns_inum
= sb
.st_ino
;
111 if (snprintf(proc_ns_path
, LTTNG_PROC_NS_PATH_MAX
,
112 "/proc/self/task/%d/%s/net", lttng_gettid(), ns
) >= 0) {
113 if (stat(proc_ns_path
, &sb
) == 0) {
114 *ns_inum
= sb
.st_ino
;
124 static int do_the_needful(int ns_flag
, const char *ns_str
)
129 ret
= get_ns_inum(ns_str
, &ns1
);
131 debug_printf("Failed to get ns inode number for namespace %s",
136 debug_printf("Initial %s ns inode number: %" PRIuMAX
"\n", ns_str
, (uintmax_t) ns1
);
138 /* Wait on synchronization before unshare. */
139 if (before_unshare_wait_file_path
) {
140 ret
= wait_on_file(before_unshare_wait_file_path
);
146 ret
= unshare(ns_flag
);
148 perror("Failed to unshare namespace");
152 ret
= get_ns_inum(ns_str
, &ns2
);
154 debug_printf("Failed to get ns inode number for namespace %s",
159 debug_printf("Post unshare %s ns inode number: %" PRIuMAX
"\n", ns_str
, (uintmax_t) ns2
);
161 /* Signal that the unshare call is completed. */
162 if (after_unshare_signal_file_path
) {
163 ret
= create_file(after_unshare_signal_file_path
);
169 /* Wait on synchronization after unshare. */
170 if (after_unshare_wait_file_path
) {
171 ret
= wait_on_file(after_unshare_wait_file_path
);
181 int main(int argc
, const char **argv
)
184 int ret
= EXIT_SUCCESS
;
187 pc
= poptGetContext(NULL
, argc
, argv
, opts
, 0);
188 poptReadDefaultConfig(pc
, 0);
191 poptPrintHelp(pc
, stderr
, 0);
196 while ((opt
= poptGetNextOpt(pc
)) >= 0) {
199 poptPrintUsage(pc
, stderr
, 0);
206 /* an error occurred during option processing */
207 poptPrintUsage(pc
, stderr
, 0);
208 fprintf(stderr
, "%s: %s\n",
209 poptBadOption(pc
, POPT_BADOPTION_NOALIAS
),
215 if (ns_opt
== NULL
) {
216 poptPrintUsage(pc
, stderr
, 0);
221 if (set_signal_handler()) {
226 if (strncmp(ns_opt
, "cgroup", 6) == 0) {
227 ret
= do_the_needful(CLONE_NEWCGROUP
, "cgroup");
228 } else if (strncmp(ns_opt
, "ipc", 3) == 0) {
229 ret
= do_the_needful(CLONE_NEWIPC
, "ipc");
230 } else if (strncmp(ns_opt
, "mnt", 3) == 0) {
231 ret
= do_the_needful(CLONE_NEWNS
, "mnt");
232 } else if (strncmp(ns_opt
, "net", 3) == 0) {
233 ret
= do_the_needful(CLONE_NEWNET
, "net");
234 } else if (strncmp(ns_opt
, "pid", 3) == 0) {
235 ret
= do_the_needful(CLONE_NEWPID
, "pid");
236 } else if (strncmp(ns_opt
, "time", 4) == 0) {
237 ret
= do_the_needful(CLONE_NEWTIME
, "time");
238 } else if (strncmp(ns_opt
, "user", 4) == 0) {
240 * Will always fail, requires a single threaded application,
241 * which can't happen with UST.
243 ret
= do_the_needful(CLONE_NEWUSER
, "user");
244 } else if (strncmp(ns_opt
, "uts", 3) == 0) {
245 ret
= do_the_needful(CLONE_NEWUTS
, "uts");
247 printf("invalid ns id\n");
251 ret
= ret
? EXIT_FAILURE
: EXIT_SUCCESS
;