1// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2
3// The test models how sandbox2 unshares user namespace after clone:
4// https://github.com/google/sandboxed-api/blob/c95837a6c131fbdf820db352a97d54fcbcbde6c0/sandboxed_api/sandbox2/forkserver.cc#L249
5// which works only in single-threaded processes.
6
7#include "../test.h"
8#include <errno.h>
9#include <sched.h>
10#include <sys/types.h>
11#include <sys/wait.h>
12#ifdef __linux__
13# include <linux/version.h>
14#endif
15
16#if __PPC64__ && RHEL_MAJOR == 7 && RHEL_MINOR == 9
17# define PPC64_RHEL7_9 1
18#endif
19
20#ifndef PPC64_RHEL7_9
21static int cloned(void *arg) {
22 // Unshare can fail for other reasons, e.g. no permissions,
23 // so check only the error we are interested in:
24 // if the process is multi-threaded unshare must return EINVAL.
25 if (unshare(CLONE_NEWUSER) && errno == EINVAL) {
26 fprintf(stderr, format: "unshare failed: %d\n", errno);
27 exit(status: 1);
28 }
29 exit(status: 0);
30 return 0;
31}
32#endif
33
34int main() {
35#ifndef PPC64_RHEL7_9
36 char stack[64 << 10] __attribute__((aligned(64)));
37 int pid = clone(fn: cloned, child_stack: stack + sizeof(stack), SIGCHLD, arg: 0);
38 if (pid == -1) {
39 fprintf(stderr, format: "failed to clone: %d\n", errno);
40 exit(status: 1);
41 }
42 int status = 0;
43 while (wait(stat_loc: &status) != pid) {
44 }
45 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
46 fprintf(stderr, format: "child failed: %d\n", status);
47 exit(status: 1);
48 }
49#endif
50 fprintf(stderr, format: "DONE\n");
51}
52
53// CHECK: DONE
54

source code of compiler-rt/test/tsan/Linux/clone_setns.cpp