kernel/ipc, branch linux-6.14.y

treewide: const qualify ctl_tables where applicable

2025-01-28T12:48:37Z

Add the const qualifier to all the ctl_tables in the tree except for watchdog_hardlockup_sysctl, memory_allocation_profiling_sysctls, loadpin_sysctl_table and the ones calling register_net_sysctl (./net, drivers/inifiniband dirs). These are special cases as they use a registration function with a non-const qualified ctl_table argument or modify the arrays before passing them on to the registration function. Constifying ctl_table structs will prevent the modification of proc_handler function pointers as the arrays would reside in .rodata. This is made possible after commit 78eb4ea25cd5 ("sysctl: treewide: constify the ctl_table argument of proc_handlers") constified all the proc_handlers. Created this by running an spatch followed by a sed command: Spatch: virtual patch @ depends on !(file in "net") disable optional_qualifier @ identifier table_name != { watchdog_hardlockup_sysctl, iwcm_ctl_table, ucma_ctl_table, memory_allocation_profiling_sysctls, loadpin_sysctl_table }; @@ + const struct ctl_table table_name [] = { ... }; sed: sed --in-place \ -e "s/struct ctl_table .table = &uts_kern/const struct ctl_table *table = \&uts_kern/" \ kernel/utsname_sysctl.c Reviewed-by: Song Liu Acked-by: Steven Rostedt (Google) # for kernel/trace/ Reviewed-by: Martin K. Petersen # SCSI Reviewed-by: Darrick J. Wong # xfs Acked-by: Jani Nikula Acked-by: Corey Minyard Acked-by: Wei Liu Acked-by: Thomas Gleixner Reviewed-by: Bill O'Donnell Acked-by: Baoquan He Acked-by: Ashutosh Dixit Acked-by: Anna Schumaker Signed-off-by: Joel Granados

ipc/util.c: complete the kernel-doc function descriptions

2025-01-25T06:47:27Z

Move the function descriptive comments so that they conform to kernel-doc format, eliminating the kernel-doc warnings. util.c:618: warning: missing initial short description on line: * ipc_obtain_object_idr util.c:640: warning: missing initial short description on line: * ipc_obtain_object_check Link: https://lkml.kernel.org/r/20250111062905.910576-1-rdunlap@infradead.org Signed-off-by: Randy Dunlap Signed-off-by: Andrew Morton

Merge tag 'mm-nonmm-stable-2024-11-24-02-05' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2024-11-26T00:09:48Z

Pull non-MM updates from Andrew Morton: - The series "resource: A couple of cleanups" from Andy Shevchenko performs some cleanups in the resource management code - The series "Improve the copy of task comm" from Yafang Shao addresses possible race-induced overflows in the management of task_struct.comm[] - The series "Remove unnecessary header includes from {tools/}lib/list_sort.c" from Kuan-Wei Chiu adds some cleanups and a small fix to the list_sort library code and to its selftest - The series "Enhance min heap API with non-inline functions and optimizations" also from Kuan-Wei Chiu optimizes and cleans up the min_heap library code - The series "nilfs2: Finish folio conversion" from Ryusuke Konishi finishes off nilfs2's folioification - The series "add detect count for hung tasks" from Lance Yang adds more userspace visibility into the hung-task detector's activity - Apart from that, singelton patches in many places - please see the individual changelogs for details * tag 'mm-nonmm-stable-2024-11-24-02-05' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (71 commits) gdb: lx-symbols: do not error out on monolithic build kernel/reboot: replace sprintf() with sysfs_emit() lib: util_macros_kunit: add kunit test for util_macros.h util_macros.h: fix/rework find_closest() macros Improve consistency of '#error' directive messages ocfs2: fix uninitialized value in ocfs2_file_read_iter() hung_task: add docs for hung_task_detect_count hung_task: add detect count for hung tasks dma-buf: use atomic64_inc_return() in dma_buf_getfile() fs/proc/kcore.c: fix coccinelle reported ERROR instances resource: avoid unnecessary resource tree walking in __region_intersects() ocfs2: remove unused errmsg function and table ocfs2: cluster: fix a typo lib/scatterlist: use sg_phys() helper checkpatch: always parse orig_commit in fixes tag nilfs2: convert metadata aops from writepage to writepages nilfs2: convert nilfs_recovery_copy_block() to take a folio nilfs2: convert nilfs_page_count_clean_buffers() to take a folio nilfs2: remove nilfs_writepage nilfs2: convert checkpoint file to be folio-based ...

ipc: fix memleak if msg_init_ns failed in create_ipc_ns

2024-11-06T01:12:33Z

Percpu memory allocation may failed during create_ipc_ns however this fail is not handled properly since ipc sysctls and mq sysctls is not released properly. Fix this by release these two resource when failure. Here is the kmemleak stack when percpu failed: unreferenced object 0xffff88819de2a600 (size 512): comm "shmem_2nstest", pid 120711, jiffies 4300542254 hex dump (first 32 bytes): 60 aa 9d 84 ff ff ff ff fc 18 48 b2 84 88 ff ff `.........H..... 04 00 00 00 a4 01 00 00 20 e4 56 81 ff ff ff ff ........ .V..... backtrace (crc be7cba35): [] __kmalloc_node_track_caller_noprof+0x333/0x420 [] kmemdup_noprof+0x26/0x50 [] setup_mq_sysctls+0x57/0x1d0 [] copy_ipcs+0x29c/0x3b0 [] create_new_namespaces+0x1d0/0x920 [] copy_namespaces+0x2e9/0x3e0 [] copy_process+0x29f3/0x7ff0 [] kernel_clone+0xc0/0x650 [] __do_sys_clone+0xa1/0xe0 [] do_syscall_64+0xbf/0x1c0 [] entry_SYSCALL_64_after_hwframe+0x4b/0x53 Link: https://lkml.kernel.org/r/20241023093129.3074301-1-mawupeng1@huawei.com Fixes: 72d1e611082e ("ipc/msg: mitigate the lock contention with percpu counter") Signed-off-by: Ma Wupeng Cc: Signed-off-by: Andrew Morton

ipc/msg: replace one-element array with flexible array member

2024-11-06T01:12:28Z

Replace the deprecated one-element array with a modern flexible array member in the struct compat_msgbuf. There are no binary differences after this conversion. Link: https://github.com/KSPP/linux/issues/79 Link: https://lkml.kernel.org/r/20240930195824.153648-2-thorsten.blum@linux.dev Signed-off-by: Thorsten Blum Cc: "Sun, Jiebin" Cc: Tim Chen Signed-off-by: Andrew Morton

fdget(), more trivial conversions

2024-11-03T06:28:06Z

all failure exits prior to fdget() leave the scope, all matching fdput() are immediately followed by leaving the scope. [xfs_ioc_commit_range() chunk moved here as well] Reviewed-by: Christian Brauner Signed-off-by: Al Viro

do_mq_notify(): switch to CLASS(fd)

2024-11-03T06:28:06Z

The only failure exit before fdget() is a return, the only thing done after fdput() is transposable with it. Reviewed-by: Christian Brauner Signed-off-by: Al Viro

do_mq_notify(): saner skb freeing on failures

2024-11-03T06:28:06Z

cleanup is convoluted enough as it is; it's easier to have early failure outs do explicit kfree_skb(nc), rather than going to contortions needed to reuse the cleanup from late failures. Signed-off-by: Al Viro

switch netlink_getsockbyfilp() to taking descriptor

2024-11-03T06:28:06Z

the only call site (in do_mq_notify()) obtains the argument from an immediately preceding fdget() and it is immediately followed by fdput(); might as well just replace it with a variant that would take a descriptor instead of struct file * and have file lookups handled inside that function. Reviewed-by: Christian Brauner Signed-off-by: Al Viro

Merge tag 'pull-stable-struct_fd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2024-09-23T16:35:36Z

Pull 'struct fd' updates from Al Viro: "Just the 'struct fd' layout change, with conversion to accessor helpers" * tag 'pull-stable-struct_fd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: add struct fd constructors, get rid of __to_fd() struct fd: representation change introduce fd_file(), convert all accessors to it.