selftests/pidfd: add CLONE_AUTOREAP tests

Add tests for the new CLONE_AUTOREAP clone3() flag:

- autoreap_without_pidfd: CLONE_AUTOREAP without CLONE_PIDFD works
(fire-and-forget)
- autoreap_rejec

selftests/pidfd: add CLONE_AUTOREAP tests

Add tests for the new CLONE_AUTOREAP clone3() flag:

- autoreap_without_pidfd: CLONE_AUTOREAP without CLONE_PIDFD works
(fire-and-forget)
- autoreap_rejects_exit_signal: CLONE_AUTOREAP with non-zero
exit_signal fails
- autoreap_rejects_parent: CLONE_AUTOREAP with CLONE_PARENT fails
- autoreap_rejects_thread: CLONE_AUTOREAP with CLONE_THREAD fails
- autoreap_basic: child exits, pidfd poll works, PIDFD_GET_INFO returns
correct exit code, waitpid() returns -ECHILD
- autoreap_signaled: child killed by signal, exit info correct via pidfd
- autoreap_reparent: autoreap grandchild reparented to subreaper still
auto-reaps
- autoreap_multithreaded: autoreap process with sub-threads auto-reaps
after last thread exits
- autoreap_no_inherit: grandchild forked without CLONE_AUTOREAP becomes
a regular zombie

Link: https://patch.msgid.link/20260226-work-pidfs-autoreap-v5-4-d148b984a989@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

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selftests/pidfd: test setattr support

Verify that ->setattr() on a pidfd doens't work.

Link: https://lore.kernel.org/20250618-work-pidfs-persistent-v2-15-98f3456fd552@kernel.org
Reviewed-by: Alexan

selftests/pidfd: test setattr support

Verify that ->setattr() on a pidfd doens't work.

Link: https://lore.kernel.org/20250618-work-pidfs-persistent-v2-15-98f3456fd552@kernel.org
Reviewed-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

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selftests/pidfd: test extended attribute support

Add tests for extended attribute support on pidfds.

Link: https://lore.kernel.org/20250618-work-pidfs-persistent-v2-13-98f3456fd552@kernel.org
Revie

selftests/pidfd: test extended attribute support

Add tests for extended attribute support on pidfds.

Link: https://lore.kernel.org/20250618-work-pidfs-persistent-v2-13-98f3456fd552@kernel.org
Reviewed-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

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selftests/pidfd: add seventh PIDFD_INFO_EXIT selftest

Add a selftest for PIDFD_INFO_EXIT behavior.

Link: https://lore.kernel.org/r/20250305-work-pidfs-kill_on_last_close-v3-16-c8c3d8361705@kernel.o

selftests/pidfd: add seventh PIDFD_INFO_EXIT selftest

Add a selftest for PIDFD_INFO_EXIT behavior.

Link: https://lore.kernel.org/r/20250305-work-pidfs-kill_on_last_close-v3-16-c8c3d8361705@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

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selftests/pidfd: add first PIDFD_INFO_EXIT selftest

Add a selftest for PIDFD_INFO_EXIT behavior.

Link: https://lore.kernel.org/r/20250305-work-pidfs-kill_on_last_close-v3-10-c8c3d8361705@kernel.org

selftests/pidfd: add first PIDFD_INFO_EXIT selftest

Add a selftest for PIDFD_INFO_EXIT behavior.

Link: https://lore.kernel.org/r/20250305-work-pidfs-kill_on_last_close-v3-10-c8c3d8361705@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

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selftests: add pidfd bind-mount tests

Link: https://lore.kernel.org/r/20241219-work-pidfs-mount-v1-2-dbc56198b839@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

selftests/pidfd: add pidfs file handle selftests

Add selftests for pidfs file handles.

Link: https://lore.kernel.org/r/20241202-imstande-einsicht-d78753e1c632@brauner
Reviewed-by: Amir Goldstein <a

selftests/pidfd: add pidfs file handle selftests

Add selftests for pidfs file handles.

Link: https://lore.kernel.org/r/20241202-imstande-einsicht-d78753e1c632@brauner
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

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selftests/pidfd: add pidfd setns tests

This is basically a test-suite for setns() and as of now contains:
- test that we can't pass garbage flags
- test that we can't attach to the namespaces of ta

selftests/pidfd: add pidfd setns tests

This is basically a test-suite for setns() and as of now contains:
- test that we can't pass garbage flags
- test that we can't attach to the namespaces of task that has already exited
- test that we can incrementally setns into all namespaces of a target task
using a pidfd
- test that we can setns atomically into all namespaces of a target task
- test that we can't cross setns into a user namespace outside of our user
namespace hierarchy
- test that we can't setns into namespaces owned by user namespaces over which
we are not privileged

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/r/20200505140432.181565-4-christian.brauner@ubuntu.com

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.gitignore: add SPDX License Identifier

Add SPDX License Identifier to all .gitignore files.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfou

.gitignore: add SPDX License Identifier

Add SPDX License Identifier to all .gitignore files.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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selftests: pidfd: Add pidfd_fdinfo_test in .gitignore

The commit identified below added pidfd_fdinfo_test
but failed to add it to .gitignore

Fixes: 2def297ec7fb ("pidfd: add tests for NSpid info in

selftests: pidfd: Add pidfd_fdinfo_test in .gitignore

The commit identified below added pidfd_fdinfo_test
but failed to add it to .gitignore

Fixes: 2def297ec7fb ("pidfd: add tests for NSpid info in fdinfo")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/966567c7dbaa26a06730d796354f8a086c0ee288.1582847778.git.christophe.leroy@c-s.fr
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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test: Add test for pidfd getfd

The following tests:
* Fetch FD, and then compare via kcmp
* Make sure getfd can be blocked by blocking ptrace_may_access
* Making sure fetching bad FDs fails

test: Add test for pidfd getfd

The following tests:
* Fetch FD, and then compare via kcmp
* Make sure getfd can be blocked by blocking ptrace_may_access
* Making sure fetching bad FDs fails
* Make sure trying to set flags to non-zero results in an EINVAL

Signed-off-by: Sargun Dhillon <sargun@sargun.me>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/r/20200107175927.4558-5-sargun@sargun.me
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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tests: add pidfd poll tests

This adds testing for polling on pidfd of a process being killed. Test runs
10000 iterations by default to stress test pidfd polling functionality.
It accepts an optional

tests: add pidfd poll tests

This adds testing for polling on pidfd of a process being killed. Test runs
10000 iterations by default to stress test pidfd polling functionality.
It accepts an optional command-line parameter to override the number or
iterations to run.
Specifically, it tests for:
- pidfd_open on a child process succeeds
- pidfd_send_signal on a child process succeeds
- polling on pidfd succeeds and returns exactly one event
- returned event is POLLIN
- event is received within 3 secs of the process being killed

10000 iterations was chosen because of the race condition being tested
which is not consistently reproducible but usually is revealed after less
than 2000 iterations.
Reveals race fixed by commit b191d6491be6 ("pidfd: fix a poll race when setting exit_state")

Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Link: https://lore.kernel.org/r/20190726162226.252750-2-surenb@google.com
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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pidfd: add pidfd_wait tests

Add tests for pidfd_wait() and CLONE_WAIT_PID:
- test that waitid(P_PIDFD) fails on /proc/<pid>
- test that waitid(P_PIDFD) fails on /dev/null
- test that waitid(P_PIDFD)

pidfd: add pidfd_wait tests

Add tests for pidfd_wait() and CLONE_WAIT_PID:
- test that waitid(P_PIDFD) fails on /proc/<pid>
- test that waitid(P_PIDFD) fails on /dev/null
- test that waitid(P_PIDFD) can wait on a pidfd
- test that waitid(P_PIDFD) can wait on a pidfd and return siginfo_t
- test that waitid(P_PIDFD) works with WEXITED
- test that waitid(P_PIDFD) works with WSTOPPED
- test that waitid(P_PIDFD) works with WUNTRACED
- test that waitid(P_PIDFD) works with WCONTINUED
- test that waitid(P_PIDFD) works with WNOWAIT
- test that waitid(P_PIDFD)works with WNOHANG

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: David Howells <dhowells@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Andy Lutomirsky <luto@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Aleksa Sarai <cyphar@cyphar.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/r/20190727222229.6516-3-christian@brauner.io

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tests: add pidfd_open() tests

This adds testing for the new pidfd_open() syscalls. Specifically, we test:
- that no invalid flags can be passed to pidfd_open()
- that no invalid pid can be passed to

tests: add pidfd_open() tests

This adds testing for the new pidfd_open() syscalls. Specifically, we test:
- that no invalid flags can be passed to pidfd_open()
- that no invalid pid can be passed to pidfd_open()
- that a pidfd can be retrieved with pidfd_open()
- that the retrieved pidfd references the correct pid

Signed-off-by: Christian Brauner <christian@brauner.io>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jann Horn <jannh@google.com>
Cc: David Howells <dhowells@redhat.com>
Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
Cc: Andy Lutomirsky <luto@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Aleksa Sarai <cyphar@cyphar.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-api@vger.kernel.org

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selftests: pidfd: Create .gitignore to include pidfd_test

Create ../selftests/pidfd/.gitignore which holds the following file name
created after compiling:

- pidfd_test

Signed-off-by: Kelsey Skun

selftests: pidfd: Create .gitignore to include pidfd_test

Create ../selftests/pidfd/.gitignore which holds the following file name
created after compiling:

- pidfd_test

Signed-off-by: Kelsey Skunberg <skunberg.kelsey@gmail.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

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