19c1d03f97
Some bots failed with: unshare failed: 1 https://lab.llvm.org/buildbot/#/builders/70/builds/14101 Look only for the target EINVAL error. Differential Revision: https://reviews.llvm.org/D113759
43 lines
1.2 KiB
C++
43 lines
1.2 KiB
C++
// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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// The test models how sandbox2 unshares user namespace after clone:
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// https://github.com/google/sandboxed-api/blob/c95837a6c131fbdf820db352a97d54fcbcbde6c0/sandboxed_api/sandbox2/forkserver.cc#L249
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// which works only in sigle-threaded processes.
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#include "../test.h"
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#include <errno.h>
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#include <sched.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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static int cloned(void *arg) {
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// Unshare can fail for other reasons, e.g. no permissions,
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// so check only the error we are interested in:
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// if the process is multi-threaded unshare must return EINVAL.
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if (unshare(CLONE_NEWUSER) && errno == EINVAL) {
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fprintf(stderr, "unshare failed: %d\n", errno);
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exit(1);
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}
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exit(0);
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return 0;
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}
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int main() {
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char stack[64 << 10] __attribute__((aligned(64)));
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int pid = clone(cloned, stack + sizeof(stack), SIGCHLD, 0);
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if (pid == -1) {
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fprintf(stderr, "failed to clone: %d\n", errno);
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exit(1);
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}
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int status = 0;
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while (wait(&status) != pid) {
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}
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
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fprintf(stderr, "child failed: %d\n", status);
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exit(1);
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}
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fprintf(stderr, "DONE\n");
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}
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// CHECK: DONE
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