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Linux: Detect user namespace support in io/tst-getcwd-smallbuff

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Otherwise the test fails with certain container runtimes.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
(cherry picked from commit 5b8e7980c5)
This commit is contained in:
Florian Weimer 2022-01-24 18:14:24 +01:00 committed by Aurelien Jarno
parent 4ad1659d8c
commit 0a167374fd
1 changed files with 18 additions and 0 deletions
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18
sysdeps/unix/sysv/linux/tst-getcwd-smallbuff.c
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@ -34,6 +34,7 @@
#include <sys/un.h>
#include <support/check.h>
#include <support/temp_file.h>
#include <support/test-driver.h>
#include <support/xsched.h>
#include <support/xunistd.h>
@ -188,6 +189,23 @@ do_test (void)
xmkdir (MOUNT_NAME, S_IRWXU);
atexit (do_cleanup);
/* Check whether user namespaces are supported. */
{
pid_t pid = xfork ();
if (pid == 0)
{
if (unshare (CLONE_NEWUSER | CLONE_NEWNS) != 0)
_exit (EXIT_UNSUPPORTED);
else
_exit (0);
}
int status;
xwaitpid (pid, &status, 0);
TEST_VERIFY_EXIT (WIFEXITED (status));
if (WEXITSTATUS (status) != 0)
return WEXITSTATUS (status);
}
TEST_VERIFY_EXIT (socketpair (AF_UNIX, SOCK_STREAM, 0, sockfd) == 0);
pid_t child_pid = xclone (child_func, NULL, child_stack,
sizeof (child_stack),