diff options
Diffstat (limited to 'pkg/rootless')
| -rw-r--r-- | pkg/rootless/rootless.go | 2 | ||||
| -rw-r--r-- | pkg/rootless/rootless_linux.c | 24 | ||||
| -rw-r--r-- | pkg/rootless/rootless_linux.go | 35 |
3 files changed, 34 insertions, 27 deletions
diff --git a/pkg/rootless/rootless.go b/pkg/rootless/rootless.go index d7143f549..94535f45e 100644 --- a/pkg/rootless/rootless.go +++ b/pkg/rootless/rootless.go @@ -50,7 +50,7 @@ func TryJoinPauseProcess(pausePidPath string) (bool, int, error) { if err != nil { // It is still failing. We can safely remove it. os.Remove(pausePidPath) - return false, -1, nil // nolint: nilerr + return false, -1, nil //nolint: nilerr } return became, ret, err } diff --git a/pkg/rootless/rootless_linux.c b/pkg/rootless/rootless_linux.c index 94bd40f86..3588313c6 100644 --- a/pkg/rootless/rootless_linux.c +++ b/pkg/rootless/rootless_linux.c @@ -178,7 +178,7 @@ get_cmd_line_args () char *tmp = realloc (buffer, allocated); if (tmp == NULL) return NULL; - buffer = tmp; + buffer = tmp; } } @@ -243,7 +243,7 @@ can_use_shortcut () } if (argv[argc+1] != NULL && (strcmp (argv[argc], "container") == 0 || - strcmp (argv[argc], "image") == 0) && + strcmp (argv[argc], "image") == 0) && (strcmp (argv[argc+1], "mount") == 0 || strcmp (argv[argc+1], "scp") == 0)) { ret = false; @@ -512,7 +512,9 @@ create_pause_process (const char *pause_pid_file_path, char **argv) r = TEMP_FAILURE_RETRY (read (p[0], &b, 1)); close (p[0]); - reexec_in_user_namespace_wait (pid, 0); + r = reexec_in_user_namespace_wait (pid, 0); + if (r != 0) + return -1; return r == 1 && b == '0' ? 0 : -1; } @@ -757,6 +759,7 @@ reexec_userns_join (int pid_to_join, char *pause_pid_file_path) } execvp (argv[0], argv); + fprintf (stderr, "failed to execvp %s: %m\n", argv[0]); _exit (EXIT_FAILURE); } @@ -788,7 +791,10 @@ copy_file_to_fd (const char *file_to_read, int outfd) fd = open (file_to_read, O_RDONLY); if (fd < 0) - return fd; + { + fprintf (stderr, "open `%s`: %m\n", file_to_read); + return fd; + } for (;;) { @@ -796,7 +802,10 @@ copy_file_to_fd (const char *file_to_read, int outfd) r = TEMP_FAILURE_RETRY (read (fd, buf, sizeof buf)); if (r < 0) - return r; + { + fprintf (stderr, "read from `%s`: %m\n", file_to_read); + return r; + } if (r == 0) break; @@ -805,7 +814,10 @@ copy_file_to_fd (const char *file_to_read, int outfd) { w = TEMP_FAILURE_RETRY (write (outfd, &buf[t], r - t)); if (w < 0) - return w; + { + fprintf (stderr, "write file to output fd `%s`: %m\n", file_to_read); + return w; + } t += w; } } diff --git a/pkg/rootless/rootless_linux.go b/pkg/rootless/rootless_linux.go index 5af9a978b..d0bdf0ffe 100644 --- a/pkg/rootless/rootless_linux.go +++ b/pkg/rootless/rootless_linux.go @@ -182,7 +182,7 @@ func joinUserAndMountNS(pid uint, pausePid string) (bool, int, error) { pidC := C.reexec_userns_join(C.int(pid), cPausePid) if int(pidC) < 0 { - return false, -1, errors.Errorf("cannot re-exec process") + return false, -1, errors.Errorf("cannot re-exec process to join the existing user namespace") } ret := C.reexec_in_user_namespace_wait(pidC, 0) @@ -461,13 +461,8 @@ func BecomeRootInUserNS(pausePid string) (bool, int, error) { // different uidmap and the unprivileged user has no way to read the // file owned by the root in the container. func TryJoinFromFilePaths(pausePidPath string, needNewNamespace bool, paths []string) (bool, int, error) { - if len(paths) == 0 { - return BecomeRootInUserNS(pausePidPath) - } - var lastErr error var pausePid int - foundProcess := false for _, path := range paths { if !needNewNamespace { @@ -479,12 +474,9 @@ func TryJoinFromFilePaths(pausePidPath string, needNewNamespace bool, paths []st pausePid, err = strconv.Atoi(string(data)) if err != nil { - lastErr = errors.Wrapf(err, "cannot parse file %s", path) + lastErr = errors.Wrapf(err, "cannot parse file %q", path) continue } - - lastErr = nil - break } else { r, w, err := os.Pipe() if err != nil { @@ -511,26 +503,29 @@ func TryJoinFromFilePaths(pausePidPath string, needNewNamespace bool, paths []st n, err := r.Read(b) if err != nil { - lastErr = errors.Wrapf(err, "cannot read %s\n", path) + lastErr = errors.Wrapf(err, "cannot read %q", path) continue } pausePid, err = strconv.Atoi(string(b[:n])) - if err == nil && unix.Kill(pausePid, 0) == nil { - foundProcess = true - lastErr = nil - break + if err != nil { + lastErr = err + continue } } - } - if !foundProcess && pausePidPath != "" { - return BecomeRootInUserNS(pausePidPath) + + if pausePid > 0 && unix.Kill(pausePid, 0) == nil { + joined, pid, err := joinUserAndMountNS(uint(pausePid), pausePidPath) + if err == nil { + return joined, pid, nil + } + lastErr = err + } } if lastErr != nil { return false, 0, lastErr } - - return joinUserAndMountNS(uint(pausePid), pausePidPath) + return false, 0, errors.Wrapf(unix.ESRCH, "could not find any running process") } // ReadMappingsProc parses and returns the ID mappings at the specified path. |