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Viktor Malik 19468ed514 selftests/bpf: Run cgroup1_hierarchy test in own mount namespace 
The cgroup1_hierarchy test uses setup_classid_environment to setup
cgroupv1 environment. The problem is that the environment is set in
/sys/fs/cgroup and therefore, if not run under an own mount namespace,
effectively deletes all system cgroups:

    $ ls /sys/fs/cgroup | wc -l
    27
    $ sudo ./test_progs -t cgroup1_hierarchy
    #41/1    cgroup1_hierarchy/test_cgroup1_hierarchy:OK
    #41/2    cgroup1_hierarchy/test_root_cgid:OK
    #41/3    cgroup1_hierarchy/test_invalid_level:OK
    #41/4    cgroup1_hierarchy/test_invalid_cgid:OK
    #41/5    cgroup1_hierarchy/test_invalid_hid:OK
    #41/6    cgroup1_hierarchy/test_invalid_cgrp_name:OK
    #41/7    cgroup1_hierarchy/test_invalid_cgrp_name2:OK
    #41/8    cgroup1_hierarchy/test_sleepable_prog:OK
    #41      cgroup1_hierarchy:OK
    Summary: 1/8 PASSED, 0 SKIPPED, 0 FAILED
    $ ls /sys/fs/cgroup | wc -l
    1

To avoid this, run setup_cgroup_environment first which will create an
own mount namespace. This only affects the cgroupv1_hierarchy test as
all other cgroup1 test progs already run setup_cgroup_environment prior
to running setup_classid_environment.

Also add a comment to the header of setup_classid_environment to warn
against this invalid usage in future.

Fixes: 360769233c ("selftests/bpf: Add selftests for cgroup1 hierarchy")
Signed-off-by: Viktor Malik <vmalik@redhat.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240429112311.402497-1-vmalik@redhat.com
History 2024-04-29 16:14:11 -07:00
arch bpf-next-for-netdev 2024-04-29 13:12:19 -07:00
block block-6.9-20240420 2024-04-20 11:28:02 -07:00
certs This update includes the following changes: 2023-11-02 16:15:30 -10:00
crypto bpf-next-for-netdev 2024-04-29 13:12:19 -07:00
Documentation bpf-next-for-netdev 2024-04-29 13:12:19 -07:00
drivers net: phy: micrel: Add support for PTP_PF_EXTTS for lan8814 2024-04-29 13:37:19 +01:00
fs Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-04-25 12:41:37 -07:00
include bpf-next-for-netdev 2024-04-29 13:12:19 -07:00
init init/main.c: Fix potential static_command_line memory overflow 2024-04-13 00:59:36 +09:00
io_uring net: extend ubuf_info callback to ops structure 2024-04-22 16:21:35 -07:00
ipc sysctl: treewide: constify ctl_table_header::ctl_table_arg 2024-04-22 08:56:31 +01:00
kernel bpf: Switch to krealloc_array() 2024-04-29 16:13:14 -07:00
lib bpf-next-for-netdev 2024-04-29 13:12:19 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/shmem: inline shmem_is_huge() for disabled transparent hugepages 2024-04-16 15:39:51 -07:00
net bpf-next-for-netdev 2024-04-29 13:12:19 -07:00
rust Kbuild updates for v6.9 2024-03-21 14:41:00 -07:00
samples samples/bpf: Add valid info for VMLINUX_BTF 2024-04-29 16:10:03 -07:00
scripts Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-04-11 14:23:47 -07:00
security security: Place security_path_post_mknod() where the original IMA call was 2024-04-03 10:21:32 -07:00
sound ALSA: seq: ump: Fix conversion from MIDI2 to MIDI1 UMP messages 2024-04-19 12:07:14 +02:00
tools selftests/bpf: Run cgroup1_hierarchy test in own mount namespace 2024-04-29 16:14:11 -07:00
usr Kbuild updates for v6.8 2024-01-18 17:57:07 -08:00
virt KVM: Drop unused @may_block param from gfn_to_pfn_cache_invalidate_start() 2024-04-11 12:58:53 -07:00
.clang-format clang-format: Update with v6.7-rc4's for_each macro list 2023-12-08 23:54:38 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig Add .editorconfig file for basic formatting 2023-12-28 16:22:47 +09:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: create a list of all built DTB files 2024-02-19 18:20:39 +09:00
.mailmap Including fixes from netfilter, wireless and bluetooth. 2024-04-25 11:19:38 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Drop Gustavo Pimentel as PCI DWC Maintainer 2024-03-27 13:41:02 -05:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS bpf-next-for-netdev 2024-04-29 13:12:19 -07:00
Makefile Linux 6.9-rc5 2024-04-21 12:35:54 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.