linux/tools/testing/selftests/pidfd, branch v6.14

Merge tag 'mm-nonmm-stable-2025-01-24-23-16' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2025-01-27T01:50:53Z

Pull non-MM updates from Andrew Morton: "Mainly individually changelogged singleton patches. The patch series in this pull are: - "lib min_heap: Improve min_heap safety, testing, and documentation" from Kuan-Wei Chiu provides various tightenings to the min_heap library code - "xarray: extract __xa_cmpxchg_raw" from Tamir Duberstein preforms some cleanup and Rust preparation in the xarray library code - "Update reference to include/asm-" from Geert Uytterhoeven fixes pathnames in some code comments - "Converge on using secs_to_jiffies()" from Easwar Hariharan uses the new secs_to_jiffies() in various places where that is appropriate - "ocfs2, dlmfs: convert to the new mount API" from Eric Sandeen switches two filesystems to the new mount API - "Convert ocfs2 to use folios" from Matthew Wilcox does that - "Remove get_task_comm() and print task comm directly" from Yafang Shao removes now-unneeded calls to get_task_comm() in various places - "squashfs: reduce memory usage and update docs" from Phillip Lougher implements some memory savings in squashfs and performs some maintainability work - "lib: clarify comparison function requirements" from Kuan-Wei Chiu tightens the sort code's behaviour and adds some maintenance work - "nilfs2: protect busy buffer heads from being force-cleared" from Ryusuke Konishi fixes an issues in nlifs when the fs is presented with a corrupted image - "nilfs2: fix kernel-doc comments for function return values" from Ryusuke Konishi fixes some nilfs kerneldoc - "nilfs2: fix issues with rename operations" from Ryusuke Konishi addresses some nilfs BUG_ONs which syzbot was able to trigger - "minmax.h: Cleanups and minor optimisations" from David Laight does some maintenance work on the min/max library code - "Fixes and cleanups to xarray" from Kemeng Shi does maintenance work on the xarray library code" * tag 'mm-nonmm-stable-2025-01-24-23-16' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (131 commits) ocfs2: use str_yes_no() and str_no_yes() helper functions include/linux/lz4.h: add some missing macros Xarray: use xa_mark_t in xas_squash_marks() to keep code consistent Xarray: remove repeat check in xas_squash_marks() Xarray: distinguish large entries correctly in xas_split_alloc() Xarray: move forward index correctly in xas_pause() Xarray: do not return sibling entries from xas_find_marked() ipc/util.c: complete the kernel-doc function descriptions gcov: clang: use correct function param names latencytop: use correct kernel-doc format for func params minmax.h: remove some #defines that are only expanded once minmax.h: simplify the variants of clamp() minmax.h: move all the clamp() definitions after the min/max() ones minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp() minmax.h: reduce the #define expansion of min(), max() and clamp() minmax.h: update some comments minmax.h: add whitespace around operators and after commas nilfs2: do not update mtime of renamed directory that is not moved nilfs2: handle errors that nilfs_prepare_chunk() may return CREDITS: fix spelling mistake ...

Merge tag 'vfs-6.14-rc1.mount.v2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

2025-01-20T18:44:51Z

Pull vfs mount updates from Christian Brauner: - Add a mountinfo program to demonstrate statmount()/listmount() Add a new "mountinfo" sample userland program that demonstrates how to use statmount() and listmount() to get at the same info that /proc/pid/mountinfo provides - Remove pointless nospec.h include - Prepend statmount.mnt_opts string with security_sb_mnt_opts() Currently these mount options aren't accessible via statmount() - Add new mount namespaces to mount namespace rbtree outside of the namespace semaphore - Lockless mount namespace lookup Currently we take the read lock when looking for a mount namespace to list mounts in. We can make this lockless. The simple search case can just use a sequence counter to detect concurrent changes to the rbtree For walking the list of mount namespaces sequentially via nsfs we keep a separate rcu list as rb_prev() and rb_next() aren't usable safely with rcu. Currently there is no primitive for retrieving the previous list member. To do this we need a new deletion primitive that doesn't poison the prev pointer and a corresponding retrieval helper Since creating mount namespaces is a relatively rare event compared with querying mounts in a foreign mount namespace this is worth it. Once libmount and systemd pick up this mechanism to list mounts in foreign mount namespaces this will be used very frequently - Add extended selftests for lockless mount namespace iteration - Add a sample program to list all mounts on the system, i.e., in all mount namespaces - Improve mount namespace iteration performance Make finding the last or first mount to start iterating the mount namespace from an O(1) operation and add selftests for iterating the mount table starting from the first and last mount - Use an xarray for the old mount id While the ida does use the xarray internally we can use it explicitly which allows us to increment the unique mount id under the xa lock. This allows us to remove the atomic as we're now allocating both ids in one go - Use a shared header for vfs sample programs - Fix build warnings for new sample program to list all mounts * tag 'vfs-6.14-rc1.mount.v2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: samples/vfs: fix build warnings samples/vfs: use shared header samples/vfs/mountinfo: Use __u64 instead of uint64_t fs: remove useless lockdep assertion fs: use xarray for old mount id selftests: add listmount() iteration tests fs: cache first and last mount samples: add test-list-all-mounts selftests: remove unneeded include selftests: add tests for mntns iteration seltests: move nsfs into filesystems subfolder fs: simplify rwlock to spinlock fs: lockless mntns lookup for nsfs rculist: add list_bidir_{del,prev}_rcu() fs: lockless mntns rbtree lookup fs: add mount namespace to rbtree late fs: prepend statmount.mnt_opts string with security_sb_mnt_opts() mount: remove inlude/nospec.h include samples: add a mountinfo program to demonstrate statmount()/listmount()

kernel-wide: add explicity||explicitly to spelling.txt

2025-01-13T04:21:06Z

Correct the spelling dictionary so that future instances will be caught by checkpatch, and fix the instances found. Link: https://lkml.kernel.org/r/20241211154903.47027-1-cvam0000@gmail.com Signed-off-by: Shivam Chaudhary Cc: Al Viro Cc: Christophe Leroy Cc: Dennis Dalessandro Cc: Jason Gunthorpe Cc: Leon Romanovsky Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Naveen N Rao Cc: Nicholas Piggin Cc: Shivam Chaudhary Cc: Colin Ian King Signed-off-by: Andrew Morton

selftests: remove unneeded include

2025-01-09T15:58:53Z

The pidfd header will be included in a sample program and this pulls in all the mount definitions that would be causing problems. Link: https://lore.kernel.org/r/20241213-work-mount-rbtree-lockless-v3-9-6e3cdaf9b280@kernel.org Reviewed-by: Jeff Layton Signed-off-by: Christian Brauner

selftests: add pidfd bind-mount tests

2024-12-22T10:03:13Z

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

selftests/pidfd: add pidfs file handle selftests

2024-12-17T08:16:18Z

Add selftests for pidfs file handles. Link: https://lore.kernel.org/r/20241202-imstande-einsicht-d78753e1c632@brauner Reviewed-by: Amir Goldstein Signed-off-by: Christian Brauner

pidfd: add ioctl to retrieve pid info

2024-10-24T11:54:51Z

A common pattern when using pid fds is having to get information about the process, which currently requires /proc being mounted, resolving the fd to a pid, and then do manual string parsing of /proc/N/status and friends. This needs to be reimplemented over and over in all userspace projects (e.g.: I have reimplemented resolving in systemd, dbus, dbus-daemon, polkit so far), and requires additional care in checking that the fd is still valid after having parsed the data, to avoid races. Having a programmatic API that can be used directly removes all these requirements, including having /proc mounted. As discussed at LPC24, add an ioctl with an extensible struct so that more parameters can be added later if needed. Start with returning pid/tgid/ppid and creds unconditionally, and cgroupid optionally. Signed-off-by: Luca Boccassi Link: https://lore.kernel.org/r/20241010155401.2268522-1-luca.boccassi@gmail.com Signed-off-by: Christian Brauner

pidfs: add selftests for new namespace ioctls

2024-07-24T08:53:13Z

Add selftests to verify that deriving namespace file descriptors from pidfd file descriptors works correctly. Link: https://lore.kernel.org/r/20240722-work-pidfs-69dbea91edab@brauner Signed-off-by: Christian Brauner

Merge tag 'linux_kselftest-next-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

2024-05-14T18:36:54Z

Pull kselftest updates from Shuah Khan: - make framework and tests reporting KTAP compliant - make ktap_helpers and power_supply test POSIX compliant - add ksft_exit_fail_perror() to include errono in string form - avoid clang reporting false positive static analysis errors about functions that exit and never return. ksft_exit* functions are marked __noreturn to address this problem - add mechanism for reporting a KSFT_ result code - fix build warnings related missing headers and unused variables - fix clang build failures - cleanups to resctrl test - add host arch for LLVM builds * tag 'linux_kselftest-next-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (44 commits) selftests/sgx: Include KHDR_INCLUDES in Makefile selftests: Compile kselftest headers with -D_GNU_SOURCE selftests/resctrl: fix clang build warnings related to abs(), labs() calls selftests/ftrace: Fix checkbashisms errors selftests/ftrace: Fix BTFARG testcase to check fprobe is enabled correctly selftests/capabilities: fix warn_unused_result build warnings selftests: filesystems: add missing stddef header selftests: kselftest_deps: fix l5_test() empty variable selftests: default to host arch for LLVM builds selftests/resctrl: fix clang build failure: use LOCAL_HDRS selftests/binderfs: use the Makefile's rules, not Make's implicit rules Documentation: kselftest: fix codeblock selftests: kselftest: Make ksft_exit functions return void instead of int selftests: x86: ksft_exit_pass() does not return selftests: timers: ksft_exit functions do not return selftests: sync: ksft_exit_pass() does not return selftests/resctrl: ksft_exit_skip() does not return selftests: pidfd: ksft_exit functions do not return selftests/mm: ksft_exit functions do not return selftests: membarrier: ksft_exit_pass() does not return ...

selftests/pidfd: Fix wrong expectation

2024-05-11T17:18:46Z

Replace a wrong EXPECT_GT(self->child_pid_exited, 0) with EXPECT_GE(), which will be actually tested on the parent and child sides with a following commit. Cc: Shuah Khan Reviewed-by: Kees Cook Reviewed-by: Christian Brauner Link: https://lore.kernel.org/r/20240511171445.904356-8-mic@digikod.net Signed-off-by: Mickaël Salaün