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-rw-r--r--pkg/rootless/rootless_linux.c48
1 files changed, 32 insertions, 16 deletions
diff --git a/pkg/rootless/rootless_linux.c b/pkg/rootless/rootless_linux.c
index 72d461cdc..716db81dc 100644
--- a/pkg/rootless/rootless_linux.c
+++ b/pkg/rootless/rootless_linux.c
@@ -535,32 +535,30 @@ create_pause_process (const char *pause_pid_file_path, char **argv)
}
}
-static void
-join_namespace_or_die (int pid_to_join, const char *ns_file)
+static int
+open_namespace (int pid_to_join, const char *ns_file)
{
char ns_path[PATH_MAX];
int ret;
- int fd;
ret = snprintf (ns_path, PATH_MAX, "/proc/%d/ns/%s", pid_to_join, ns_file);
if (ret == PATH_MAX)
{
fprintf (stderr, "internal error: namespace path too long\n");
- _exit (EXIT_FAILURE);
+ return -1;
}
- fd = open (ns_path, O_CLOEXEC | O_RDONLY);
- if (fd < 0)
- {
- fprintf (stderr, "cannot open: %s\n", ns_path);
- _exit (EXIT_FAILURE);
- }
- if (setns (fd, 0) < 0)
+ return open (ns_path, O_CLOEXEC | O_RDONLY);
+}
+
+static void
+join_namespace_or_die (const char *name, int ns_fd)
+{
+ if (setns (ns_fd, 0) < 0)
{
- fprintf (stderr, "cannot set namespace to %s: %s\n", ns_path, strerror (errno));
+ fprintf (stderr, "cannot set %s namespace\n", name);
_exit (EXIT_FAILURE);
}
- close (fd);
}
int
@@ -570,6 +568,8 @@ reexec_userns_join (int pid_to_join, char *pause_pid_file_path)
char gid[16];
char **argv;
int pid;
+ int mnt_ns = -1;
+ int user_ns = -1;
char *cwd = getcwd (NULL, 0);
sigset_t sigset, oldsigset;
@@ -589,14 +589,28 @@ reexec_userns_join (int pid_to_join, char *pause_pid_file_path)
_exit (EXIT_FAILURE);
}
+ user_ns = open_namespace (pid_to_join, "user");
+ if (user_ns < 0)
+ return user_ns;
+ mnt_ns = open_namespace (pid_to_join, "mnt");
+ if (mnt_ns < 0)
+ {
+ close (user_ns);
+ return mnt_ns;
+ }
+
pid = fork ();
if (pid < 0)
fprintf (stderr, "cannot fork: %s\n", strerror (errno));
if (pid)
{
- /* We passed down these fds, close them. */
int f;
+
+ /* We passed down these fds, close them. */
+ close (user_ns);
+ close (mnt_ns);
+
for (f = 3; f < open_files_max_fd; f++)
if (open_files_set == NULL || FD_ISSET (f % FD_SETSIZE, &(open_files_set[f / FD_SETSIZE])))
close (f);
@@ -634,8 +648,10 @@ reexec_userns_join (int pid_to_join, char *pause_pid_file_path)
_exit (EXIT_FAILURE);
}
- join_namespace_or_die (pid_to_join, "user");
- join_namespace_or_die (pid_to_join, "mnt");
+ join_namespace_or_die ("user", user_ns);
+ join_namespace_or_die ("mnt", mnt_ns);
+ close (user_ns);
+ close (mnt_ns);
if (syscall_setresgid (0, 0, 0) < 0)
{