diff --git a/src/extract.c b/src/extract.c index 98236aca..44233b9e 100644 --- a/src/extract.c +++ b/src/extract.c @@ -864,6 +864,20 @@ open_output_file (char const *file_name, int typeflag, mode_t mode, } } + /* If O_NOFOLLOW is needed but does not work, check for a symlink + separately. There's a race condition, but that cannot be avoided + on hosts lacking O_NOFOLLOW. */ + if (! O_NOFOLLOW && overwriting_old_files && ! dereference_option) + { + struct stat st; + if (fstatat (chdir_fd, file_name, &st, AT_SYMLINK_NOFOLLOW) == 0 + && S_ISLNK (st.st_mode)) + { + errno = ELOOP; + return -1; + } + } + fd = openat (chdir_fd, file_name, openflag, mode); if (0 <= fd) {