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 sigle-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
cloned(void * arg)21 static 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, "unshare failed: %d\n", errno);
27 exit(1);
28 }
29 exit(0);
30 return 0;
31 }
32 #endif
33
main()34 int main() {
35 #ifndef PPC64_RHEL7_9
36 char stack[64 << 10] __attribute__((aligned(64)));
37 int pid = clone(cloned, stack + sizeof(stack), SIGCHLD, 0);
38 if (pid == -1) {
39 fprintf(stderr, "failed to clone: %d\n", errno);
40 exit(1);
41 }
42 int status = 0;
43 while (wait(&status) != pid) {
44 }
45 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
46 fprintf(stderr, "child failed: %d\n", status);
47 exit(1);
48 }
49 #endif
50 fprintf(stderr, "DONE\n");
51 }
52
53 // CHECK: DONE
54