linux.git/tools/testing/selftests/namespaces, branch v7.2-rc1 Linux kernel source tree selftests/namespaces: Skip efault tests when listns() is not available 2026-05-11T10:25:32+00:00 Ricardo B. Marlière rbm@suse.com 2026-04-07T14:35:47+00:00 2509bdc8a47c2f13471ac43ec989c778ed304d77 When listns() is not implemented the iterator child detects ENOSYS and exits cleanly with status PIDFD_SKIP before the parent has a chance to signal it. The parent sends SIGKILL (which is a harmless no-op at that point) and then calls waitpid(), obtaining a normal-exit status. The subsequent ASSERT_TRUE(WIFSIGNALED(status)) therefore fails, causing the three EFAULT-focused tests to report FAIL rather than SKIP on kernels that do not yet carry listns() support. After collecting the iterator's exit status, check whether it exited with PIDFD_SKIP and issue a SKIP verdict in that case, consistent with the behaviour of every other listns test that already handles ENOSYS correctly. Signed-off-by: Ricardo B. Marlière <rbm@suse.com> Link: https://patch.msgid.link/20260407-selftests-namespaces_fixes-v1-3-59109909d88b@suse.com Signed-off-by: Christian Brauner <brauner@kernel.org> 
When listns() is not implemented the iterator child detects ENOSYS and
exits cleanly with status PIDFD_SKIP before the parent has a chance to
signal it.  The parent sends SIGKILL (which is a harmless no-op at that
point) and then calls waitpid(), obtaining a normal-exit status.  The
subsequent ASSERT_TRUE(WIFSIGNALED(status)) therefore fails, causing the
three EFAULT-focused tests to report FAIL rather than SKIP on kernels that
do not yet carry listns() support.

After collecting the iterator's exit status, check whether it exited with
PIDFD_SKIP and issue a SKIP verdict in that case, consistent with the
behaviour of every other listns test that already handles ENOSYS correctly.

Signed-off-by: Ricardo B. Marlière <rbm@suse.com>
Link: https://patch.msgid.link/20260407-selftests-namespaces_fixes-v1-3-59109909d88b@suse.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
selftests/namespaces: Fix waitpid race in listns_efault_test cleanup 2026-05-11T10:25:32+00:00 Ricardo B. Marlière rbm@suse.com 2026-04-07T14:35:46+00:00 f36ddf9317dc99019a498af3853d547de1f62e5f The efault tests spawn two categories of child processes: namespace children (each in its own mount namespace, for concurrent destruction) and an iterator child that calls listns() in a tight loop. The cleanup loop used waitpid(-1), which reaps any child in any order. If the iterator child exits early (e.g. because listns() returned ENOSYS) before all namespace children have been reaped, waitpid(-1) may consume it instead. The subsequent targeted waitpid(iter_pid) would then block indefinitely. Track the PIDs of the namespace children explicitly and use targeted waitpid() calls in the cleanup loop so the iterator child cannot be inadvertently reaped during namespace cleanup. Signed-off-by: Ricardo B. Marlière <rbm@suse.com> Link: https://patch.msgid.link/20260407-selftests-namespaces_fixes-v1-2-59109909d88b@suse.com Signed-off-by: Christian Brauner <brauner@kernel.org> 
The efault tests spawn two categories of child processes: namespace
children (each in its own mount namespace, for concurrent destruction) and
an iterator child that calls listns() in a tight loop.  The cleanup loop
used waitpid(-1), which reaps any child in any order. If the iterator child
exits early (e.g. because listns() returned ENOSYS) before all namespace
children have been reaped, waitpid(-1) may consume it instead.  The
subsequent targeted waitpid(iter_pid) would then block indefinitely.

Track the PIDs of the namespace children explicitly and use targeted
waitpid() calls in the cleanup loop so the iterator child cannot be
inadvertently reaped during namespace cleanup.

Signed-off-by: Ricardo B. Marlière <rbm@suse.com>
Link: https://patch.msgid.link/20260407-selftests-namespaces_fixes-v1-2-59109909d88b@suse.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
selftests/namespaces: Kill grandchild in nsid fixture teardown 2026-05-11T10:25:31+00:00 Ricardo B. Marlière rbm@suse.com 2026-04-07T14:35:45+00:00 fdb48976b6379c2b91e1ad4aafef07ee8b1ddb0e The timens_separate and pidns_separate test cases fork a grandchild that calls pause(). FIXTURE_TEARDOWN only kills the direct child, which is the init process of the grandchild's namespace. Once the child (init) exits, the grandchild is reparented to the host init but remains alive and continues to hold the inherited write end of the test runner's TAP pipe open. tap_prefix never receives EOF and blocks indefinitely, hanging the entire test collection. Record the grandchild PID in the fixture struct so that teardown can send SIGKILL and reap it before dealing with the child. The grandchild must be reaped first because the child acts as its PID namespace init; killing the child first would kill the grandchild without giving us a chance to waitpid() it. Signed-off-by: Ricardo B. Marlière <rbm@suse.com> Link: https://patch.msgid.link/20260407-selftests-namespaces_fixes-v1-1-59109909d88b@suse.com Signed-off-by: Christian Brauner <brauner@kernel.org> 
The timens_separate and pidns_separate test cases fork a grandchild that
calls pause().  FIXTURE_TEARDOWN only kills the direct child, which is the
init process of the grandchild's namespace.  Once the child (init) exits,
the grandchild is reparented to the host init but remains alive and
continues to hold the inherited write end of the test runner's TAP pipe
open.  tap_prefix never receives EOF and blocks indefinitely, hanging the
entire test collection.

Record the grandchild PID in the fixture struct so that teardown can send
SIGKILL and reap it before dealing with the child.  The grandchild must be
reaped first because the child acts as its PID namespace init; killing the
child first would kill the grandchild without giving us a chance to
waitpid() it.

Signed-off-by: Ricardo B. Marlière <rbm@suse.com>
Link: https://patch.msgid.link/20260407-selftests-namespaces_fixes-v1-1-59109909d88b@suse.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
selftests/namespaces: remove unused utils.h include from listns_efault_test 2026-04-14T07:31:18+00:00 Christian Brauner brauner@kernel.org 2026-03-31T08:58:58+00:00 cad3bf1c330274d11f25f1b7afae9b9dba13fbd3 Remove the inclusion of ../filesystems/utils.h from listns_efault_test.c. The test doesn't use any symbols from that header. Including it alongside ../pidfd/pidfd.h causes a build failure because both headers define wait_for_pid() with conflicting linkage: ../filesystems/utils.h: extern int wait_for_pid(pid_t pid); ../pidfd/pidfd.h: static inline int wait_for_pid(pid_t pid) All symbols the test actually uses (create_child, read_nointr, write_nointr, sys_pidfd_send_signal) come from pidfd.h. Reported-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/all/acPV19IY3Gna6Ira@sirena.org.uk Fixes: 07d7ad46dad4 ("selftests/namespaces: test for efault") Signed-off-by: Christian Brauner <brauner@kernel.org> 
Remove the inclusion of ../filesystems/utils.h from listns_efault_test.c.
The test doesn't use any symbols from that header. Including it alongside
../pidfd/pidfd.h causes a build failure because both headers define
wait_for_pid() with conflicting linkage:

  ../filesystems/utils.h:  extern int wait_for_pid(pid_t pid);
  ../pidfd/pidfd.h:        static inline int wait_for_pid(pid_t pid)

All symbols the test actually uses (create_child, read_nointr,
write_nointr, sys_pidfd_send_signal) come from pidfd.h.

Reported-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/all/acPV19IY3Gna6Ira@sirena.org.uk
Fixes: 07d7ad46dad4 ("selftests/namespaces: test for efault")
Signed-off-by: Christian Brauner <brauner@kernel.org>
Merge tag 'mm-nonmm-stable-2025-12-06-11-14' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm 2025-12-06T22:01:20+00:00 Linus Torvalds torvalds@linux-foundation.org 2025-12-06T22:01:20+00:00 509d3f45847627f4c5cdce004c3ec79262b5239c Pull non-MM updates from Andrew Morton: - "panic: sys_info: Refactor and fix a potential issue" (Andy Shevchenko) fixes a build issue and does some cleanup in ib/sys_info.c - "Implement mul_u64_u64_div_u64_roundup()" (David Laight) enhances the 64-bit math code on behalf of a PWM driver and beefs up the test module for these library functions - "scripts/gdb/symbols: make BPF debug info available to GDB" (Ilya Leoshkevich) makes BPF symbol names, sizes, and line numbers available to the GDB debugger - "Enable hung_task and lockup cases to dump system info on demand" (Feng Tang) adds a sysctl which can be used to cause additional info dumping when the hung-task and lockup detectors fire - "lib/base64: add generic encoder/decoder, migrate users" (Kuan-Wei Chiu) adds a general base64 encoder/decoder to lib/ and migrates several users away from their private implementations - "rbree: inline rb_first() and rb_last()" (Eric Dumazet) makes TCP a little faster - "liveupdate: Rework KHO for in-kernel users" (Pasha Tatashin) reworks the KEXEC Handover interfaces in preparation for Live Update Orchestrator (LUO), and possibly for other future clients - "kho: simplify state machine and enable dynamic updates" (Pasha Tatashin) increases the flexibility of KEXEC Handover. Also preparation for LUO - "Live Update Orchestrator" (Pasha Tatashin) is a major new feature targeted at cloud environments. Quoting the cover letter: This series introduces the Live Update Orchestrator, a kernel subsystem designed to facilitate live kernel updates using a kexec-based reboot. This capability is critical for cloud environments, allowing hypervisors to be updated with minimal downtime for running virtual machines. LUO achieves this by preserving the state of selected resources, such as memory, devices and their dependencies, across the kernel transition. As a key feature, this series includes support for preserving memfd file descriptors, which allows critical in-memory data, such as guest RAM or any other large memory region, to be maintained in RAM across the kexec reboot. Mike Rappaport merits a mention here, for his extensive review and testing work. - "kexec: reorganize kexec and kdump sysfs" (Sourabh Jain) moves the kexec and kdump sysfs entries from /sys/kernel/ to /sys/kernel/kexec/ and adds back-compatibility symlinks which can hopefully be removed one day - "kho: fixes for vmalloc restoration" (Mike Rapoport) fixes a BUG which was being hit during KHO restoration of vmalloc() regions * tag 'mm-nonmm-stable-2025-12-06-11-14' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (139 commits) calibrate: update header inclusion Reinstate "resource: avoid unnecessary lookups in find_next_iomem_res()" vmcoreinfo: track and log recoverable hardware errors kho: fix restoring of contiguous ranges of order-0 pages kho: kho_restore_vmalloc: fix initialization of pages array MAINTAINERS: TPM DEVICE DRIVER: update the W-tag init: replace simple_strtoul with kstrtoul to improve lpj_setup KHO: fix boot failure due to kmemleak access to non-PRESENT pages Documentation/ABI: new kexec and kdump sysfs interface Documentation/ABI: mark old kexec sysfs deprecated kexec: move sysfs entries to /sys/kernel/kexec test_kho: always print restore status kho: free chunks using free_page() instead of kfree() selftests/liveupdate: add kexec test for multiple and empty sessions selftests/liveupdate: add simple kexec-based selftest for LUO selftests/liveupdate: add userspace API selftests docs: add documentation for memfd preservation via LUO mm: memfd_luo: allow preserving memfd liveupdate: luo_file: add private argument to store runtime state mm: shmem: export some functions to internal.h ... 
Pull non-MM updates from Andrew Morton:

 - "panic: sys_info: Refactor and fix a potential issue" (Andy Shevchenko)
   fixes a build issue and does some cleanup in ib/sys_info.c

 - "Implement mul_u64_u64_div_u64_roundup()" (David Laight)
   enhances the 64-bit math code on behalf of a PWM driver and beefs up
   the test module for these library functions

 - "scripts/gdb/symbols: make BPF debug info available to GDB" (Ilya Leoshkevich)
   makes BPF symbol names, sizes, and line numbers available to the GDB
   debugger

 - "Enable hung_task and lockup cases to dump system info on demand" (Feng Tang)
   adds a sysctl which can be used to cause additional info dumping when
   the hung-task and lockup detectors fire

 - "lib/base64: add generic encoder/decoder, migrate users" (Kuan-Wei Chiu)
   adds a general base64 encoder/decoder to lib/ and migrates several
   users away from their private implementations

 - "rbree: inline rb_first() and rb_last()" (Eric Dumazet)
   makes TCP a little faster

 - "liveupdate: Rework KHO for in-kernel users" (Pasha Tatashin)
   reworks the KEXEC Handover interfaces in preparation for Live Update
   Orchestrator (LUO), and possibly for other future clients

 - "kho: simplify state machine and enable dynamic updates" (Pasha Tatashin)
   increases the flexibility of KEXEC Handover. Also preparation for LUO

 - "Live Update Orchestrator" (Pasha Tatashin)
   is a major new feature targeted at cloud environments. Quoting the
   cover letter:

      This series introduces the Live Update Orchestrator, a kernel
      subsystem designed to facilitate live kernel updates using a
      kexec-based reboot. This capability is critical for cloud
      environments, allowing hypervisors to be updated with minimal
      downtime for running virtual machines. LUO achieves this by
      preserving the state of selected resources, such as memory,
      devices and their dependencies, across the kernel transition.

      As a key feature, this series includes support for preserving
      memfd file descriptors, which allows critical in-memory data, such
      as guest RAM or any other large memory region, to be maintained in
      RAM across the kexec reboot.

   Mike Rappaport merits a mention here, for his extensive review and
   testing work.

 - "kexec: reorganize kexec and kdump sysfs" (Sourabh Jain)
   moves the kexec and kdump sysfs entries from /sys/kernel/ to
   /sys/kernel/kexec/ and adds back-compatibility symlinks which can
   hopefully be removed one day

 - "kho: fixes for vmalloc restoration" (Mike Rapoport)
   fixes a BUG which was being hit during KHO restoration of vmalloc()
   regions

* tag 'mm-nonmm-stable-2025-12-06-11-14' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (139 commits)
  calibrate: update header inclusion
  Reinstate "resource: avoid unnecessary lookups in find_next_iomem_res()"
  vmcoreinfo: track and log recoverable hardware errors
  kho: fix restoring of contiguous ranges of order-0 pages
  kho: kho_restore_vmalloc: fix initialization of pages array
  MAINTAINERS: TPM DEVICE DRIVER: update the W-tag
  init: replace simple_strtoul with kstrtoul to improve lpj_setup
  KHO: fix boot failure due to kmemleak access to non-PRESENT pages
  Documentation/ABI: new kexec and kdump sysfs interface
  Documentation/ABI: mark old kexec sysfs deprecated
  kexec: move sysfs entries to /sys/kernel/kexec
  test_kho: always print restore status
  kho: free chunks using free_page() instead of kfree()
  selftests/liveupdate: add kexec test for multiple and empty sessions
  selftests/liveupdate: add simple kexec-based selftest for LUO
  selftests/liveupdate: add userspace API selftests
  docs: add documentation for memfd preservation via LUO
  mm: memfd_luo: allow preserving memfd
  liveupdate: luo_file: add private argument to store runtime state
  mm: shmem: export some functions to internal.h
  ...
selftests: complete kselftest include centralization 2025-11-27T22:24:31+00:00 Bala-Vignesh-Reddy reddybalavignesh9979@gmail.com 2025-10-16T10:44:09+00:00 e6fbd1759c9ece5044d3470f30a5e2166dc9de89 This follow-up patch completes centralization of kselftest.h and ksefltest_harness.h includes in remaining seltests files, replacing all relative paths with a non-relative paths using shared -I include path in lib.mk Tested with gcc-13.3 and clang-18.1, and cross-compiled successfully on riscv, arm64, x86_64 and powerpc arch. [reddybalavignesh9979@gmail.com: add selftests include path for kselftest.h] Link: https://lkml.kernel.org/r/20251017090201.317521-1-reddybalavignesh9979@gmail.com Link: https://lkml.kernel.org/r/20251016104409.68985-1-reddybalavignesh9979@gmail.com Signed-off-by: Bala-Vignesh-Reddy <reddybalavignesh9979@gmail.com> Suggested-by: Andrew Morton <akpm@linux-foundation.org> Link: https://lore.kernel.org/lkml/20250820143954.33d95635e504e94df01930d0@linux-foundation.org/ Reviewed-by: Wei Yang <richard.weiyang@gmail.com> Cc: David Hildenbrand <david@redhat.com> Cc: David S. Miller <davem@davemloft.net> Cc: Eric Dumazet <edumazet@google.com> Cc: Günther Noack <gnoack@google.com> Cc: Jakub Kacinski <kuba@kernel.org> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mickael Salaun <mic@digikod.net> Cc: Ming Lei <ming.lei@redhat.com> Cc: Paolo Abeni <pabeni@redhat.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Simon Horman <horms@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> 
This follow-up patch completes centralization of kselftest.h and
ksefltest_harness.h includes in remaining seltests files, replacing all
relative paths with a non-relative paths using shared -I include path in
lib.mk

Tested with gcc-13.3 and clang-18.1, and cross-compiled successfully on
riscv, arm64, x86_64 and powerpc arch.

[reddybalavignesh9979@gmail.com: add selftests include path for kselftest.h]
  Link: https://lkml.kernel.org/r/20251017090201.317521-1-reddybalavignesh9979@gmail.com
Link: https://lkml.kernel.org/r/20251016104409.68985-1-reddybalavignesh9979@gmail.com
Signed-off-by: Bala-Vignesh-Reddy <reddybalavignesh9979@gmail.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/lkml/20250820143954.33d95635e504e94df01930d0@linux-foundation.org/
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Günther Noack <gnoack@google.com>
Cc: Jakub Kacinski <kuba@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mickael Salaun <mic@digikod.net>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Simon Horman <horms@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
selftests/namespaces: fix nsid tests 2025-11-11T09:01:32+00:00 Christian Brauner brauner@kernel.org 2025-11-10T15:08:29+00:00 6453937581abc05c5e54525c65abb46955a91cd3 Ensure that we always kill and cleanup all processes. Link: https://patch.msgid.link/20251110-work-namespace-nstree-fixes-v1-17-e8a9264e0fb9@kernel.org Signed-off-by: Christian Brauner <brauner@kernel.org> 
Ensure that we always kill and cleanup all processes.

Link: https://patch.msgid.link/20251110-work-namespace-nstree-fixes-v1-17-e8a9264e0fb9@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
selftests/namespaces: test for efault 2025-11-10T14:53:56+00:00 Christian Brauner brauner@kernel.org 2025-11-09T21:11:29+00:00 07d7ad46dad48a81ffc796fb7875b1ec141c8b48 Ensure that put_user() can fail and that namespace cleanup works correctly. Link: https://patch.msgid.link/20251109-namespace-6-19-fixes-v1-8-ae8a4ad5a3b3@kernel.org Signed-off-by: Christian Brauner <brauner@kernel.org> 
Ensure that put_user() can fail and that namespace cleanup works
correctly.

Link: https://patch.msgid.link/20251109-namespace-6-19-fixes-v1-8-ae8a4ad5a3b3@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
selftests/namespaces: add active reference count regression test 2025-11-10T09:20:54+00:00 Christian Brauner brauner@kernel.org 2025-11-09T21:11:28+00:00 88efd7c6997ee9da3e0274106f72b99fa105f45f Add a regression test for setns() with pidfd. Link: https://patch.msgid.link/20251109-namespace-6-19-fixes-v1-7-ae8a4ad5a3b3@kernel.org Signed-off-by: Christian Brauner <brauner@kernel.org> 
Add a regression test for setns() with pidfd.

Link: https://patch.msgid.link/20251109-namespace-6-19-fixes-v1-7-ae8a4ad5a3b3@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
selftests/namespace: test listns() pagination 2025-11-03T16:41:25+00:00 Christian Brauner brauner@kernel.org 2025-10-29T12:21:25+00:00 2cc1c01fe97703d9d694fa49b16fb3aab47b70a9 Minimal test case to reproduce KASAN out-of-bounds in listns pagination. Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-72-2e6f823ebdc0@kernel.org Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org> 
Minimal test case to reproduce KASAN out-of-bounds in listns pagination.

Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-72-2e6f823ebdc0@kernel.org
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>