diff options
| -rw-r--r-- | pkg/rootless/rootless_linux.c | 48 |
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) { |