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rootless: add new function to join existing namespace

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Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

Closes: #1371
Approved by: rhatdan
This commit is contained in:
Giuseppe Scrivano
2018-08-29 10:01:45 +02:00
committed by Atomic Bot
parent eb5fdebc84
commit 1789242933
3 changed files with 65 additions and 2 deletions
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32
pkg/rootless/rootless_linux.c
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@ -83,7 +83,37 @@ get_cmd_line_args (pid_t pid)
}
int
reexec_in_user_namespace(int ready)
reexec_userns_join (int userns)
{
pid_t ppid = getpid ();
char uid[16];
char **argv;
int pid;
sprintf (uid, "%d", geteuid ());
argv = get_cmd_line_args (ppid);
if (argv == NULL)
_exit (EXIT_FAILURE);
pid = fork ();
if (pid)
return pid;
setenv ("_LIBPOD_USERNS_CONFIGURED", "init", 1);
setenv ("_LIBPOD_ROOTLESS_UID", uid, 1);
if (setns (userns, 0) < 0)
_exit (EXIT_FAILURE);
close (userns);
execvp (argv[0], argv);
_exit (EXIT_FAILURE);
}
int
reexec_in_user_namespace (int ready)
{
int ret;
pid_t pid;