diff options
| -rw-r--r-- | libsandbox/libsandbox.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/libsandbox/libsandbox.c b/libsandbox/libsandbox.c index 9ef13b1..e0c9d1a 100644 --- a/libsandbox/libsandbox.c +++ b/libsandbox/libsandbox.c @@ -125,7 +125,14 @@ int resolve_dirfd_path(int dirfd, const char *path, char *resolved_path, save_errno(); size_t at_len = resolved_path_len - 1 - 1 - (path ? strlen(path) : 0); - sprintf(resolved_path, "/proc/%i/fd/%i", trace_pid ? : getpid(), dirfd); + if (trace_pid) + sprintf(resolved_path, "/proc/%i/fd/%i", trace_pid, dirfd); + else + /* If /proc was mounted by a process in a different pid namespace, + * getpid cannot be used to create a valid /proc/<pid> path. Instead + * use sb_get_fd_dir() which works in any case. + */ + sprintf(resolved_path, "%s/%i", sb_get_fd_dir(), dirfd); ssize_t ret = readlink(resolved_path, resolved_path, at_len); if (ret == -1) { /* see comments at end of check_syscall() */ |