| #! /bin/bash |
| # SPDX-License-Identifier: GPL-2.0+ |
| # |
| # Copyright (c) 2021 Christian Brauner <christian.brauner@ubuntu.com> |
| # All Rights Reserved. |
| # |
| # FS QA Test No. 632 |
| # |
| # Regression test to verify that creating a series of detached mounts, |
| # attaching them to the filesystem, and unmounting them does not trigger an |
| # integer overflow in ns->mounts causing the kernel to block any new mounts in |
| # count_mounts() and returning ENOSPC because it falsely assumes that the |
| # maximum number of mounts in the mount namespace has been reached, i.e. it |
| # thinks it can't fit the new mounts into the mount namespace anymore. |
| # |
| # Kernel commit ee2e3f50629f ("mount: fix mounting of detached mounts onto |
| # targets that reside on shared mounts") fixed the bug. |
| # |
| . ./common/preamble |
| _begin_fstest auto quick mount |
| |
| _require_test |
| _require_test_program "detached_mounts_propagation" |
| |
| _mount --make-shared $TEST_DIR |
| $here/src/detached_mounts_propagation $TEST_DIR >> $seqres.full |
| status=$? |
| _mount --make-private $TEST_DIR |
| |
| echo silence is golden |
| exit |
