user/sven/linux.git/include/linux/slab.h, branch v6.13.7

Merge tag 'slab-for-6.13-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab

2024-11-26T00:51:24Z

Pull slab updates from Vlastimil Babka: - Add new slab_strict_numa boot parameter to enforce per-object memory policies on top of slab folio policies, for systems where saving cost of remote accesses is more important than minimizing slab allocation overhead (Christoph Lameter) - Fix for freeptr_offset alignment check being too strict for m68k (Geert Uytterhoeven) - krealloc() fixes for not violating __GFP_ZERO guarantees on krealloc() when slub_debug (redzone and object tracking) is enabled (Feng Tang) - Fix a memory leak in case sysfs registration fails for a slab cache, and also no longer fail to create the cache in that case (Hyeonggon Yoo) - Fix handling of detected consistency problems (due to buggy slab user) with slub_debug enabled, so that it does not cause further list corruption bugs (yuan.gao) - Code cleanup and kerneldocs polishing (Zhen Lei, Vlastimil Babka) * tag 'slab-for-6.13-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab: slab: Fix too strict alignment check in create_cache() mm/slab: Allow cache creation to proceed even if sysfs registration fails mm/slub: Avoid list corruption when removing a slab from the full list mm/slub, kunit: Add testcase for krealloc redzone and zeroing mm/slub: Improve redzone check and zeroing for krealloc() mm/slub: Consider kfence case for get_orig_size() SLUB: Add support for per object memory policies mm, slab: add kerneldocs for common SLAB_ flags mm/slab: remove duplicate check in create_cache() mm/slub: Move krealloc() and related code to slub.c mm/kasan: Don't store metadata inside kmalloc object when slub_debug_orig_size is on

mm, slab: add kerneldocs for common SLAB_ flags

2024-10-29T09:43:24Z

We have many SLAB_ flags but many are used only internally, by kunit tests or debugging subsystems cooperating with slab, or are set according to slab_debug boot parameter. Create kerneldocs for the commonly used flags that may be passed to kmem_cache_create(). SLAB_TYPESAFE_BY_RCU already had a detailed description, so turn it to a kerneldoc. Add some details for SLAB_ACCOUNT, SLAB_RECLAIM_ACCOUNT and SLAB_HWCACHE_ALIGN. Reference them from the __kmem_cache_create_args() kerneldoc. Signed-off-by: Vlastimil Babka

crypto: rsassa-pkcs1 - Migrate to sig_alg backend

2024-10-05T05:22:04Z

A sig_alg backend has just been introduced with the intent of moving all asymmetric sign/verify algorithms to it one by one. Migrate the sign/verify operations from rsa-pkcs1pad.c to a separate rsassa-pkcs1.c which uses the new backend. Consequently there are now two templates which build on the "rsa" akcipher_alg: * The existing "pkcs1pad" template, which is instantiated as an akcipher_instance and retains the encrypt/decrypt operations of RSAES-PKCS1-v1_5 (RFC 8017 sec 7.2). * The new "pkcs1" template, which is instantiated as a sig_instance and contains the sign/verify operations of RSASSA-PKCS1-v1_5 (RFC 8017 sec 8.2). In a separate step, rsa-pkcs1pad.c could optionally be renamed to rsaes-pkcs1.c for clarity. Additional "oaep" and "pss" templates could be added for RSAES-OAEP and RSASSA-PSS. Note that it's currently allowed to allocate a "pkcs1pad(rsa)" transform without specifying a hash algorithm. That makes sense if the transform is only used for encrypt/decrypt and continues to be supported. But for sign/verify, such transforms previously did not insert the Full Hash Prefix into the padding. The resulting message encoding was incompliant with EMSA-PKCS1-v1_5 (RFC 8017 sec 9.2) and therefore nonsensical. From here on in, it is no longer allowed to allocate a transform without specifying a hash algorithm if the transform is used for sign/verify operations. This simplifies the code because the insertion of the Full Hash Prefix is no longer optional, so various "if (digest_info)" clauses can be removed. There has been a previous attempt to forbid transform allocation without specifying a hash algorithm, namely by commit c0d20d22e0ad ("crypto: rsa-pkcs1pad - Require hash to be present"). It had to be rolled back with commit b3a8c8a5ebb5 ("crypto: rsa-pkcs1pad: Allow hash to be optional [ver #2]"), presumably because it broke allocation of a transform which was solely used for encrypt/decrypt, not sign/verify. Avoid such breakage by allowing transform allocation for encrypt/decrypt with and without specifying a hash algorithm (and simply ignoring the hash algorithm in the former case). So again, specifying a hash algorithm is now mandatory for sign/verify, but optional and ignored for encrypt/decrypt. The new sig_alg API uses kernel buffers instead of sglists, which avoids the overhead of copying signature and digest from sglists back into kernel buffers. rsassa-pkcs1.c is thus simplified quite a bit. sig_alg is always synchronous, whereas the underlying "rsa" akcipher_alg may be asynchronous. So await the result of the akcipher_alg, similar to crypto_akcipher_sync_{en,de}crypt(). As part of the migration, rename "rsa_digest_info" to "hash_prefix" to adhere to the spec language in RFC 9580. Otherwise keep the code unmodified wherever possible to ease reviewing and bisecting. Leave several simplification and hardening opportunities to separate commits. rsassa-pkcs1.c uses modern __free() syntax for allocation of buffers which need to be freed by kfree_sensitive(), hence a DEFINE_FREE() clause for kfree_sensitive() is introduced herein as a byproduct. Signed-off-by: Lukas Wunner Signed-off-by: Herbert Xu

Merge tag 'mm-stable-2024-09-20-02-31' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2024-09-21T14:29:05Z

Pull MM updates from Andrew Morton: "Along with the usual shower of singleton patches, notable patch series in this pull request are: - "Align kvrealloc() with krealloc()" from Danilo Krummrich. Adds consistency to the APIs and behaviour of these two core allocation functions. This also simplifies/enables Rustification. - "Some cleanups for shmem" from Baolin Wang. No functional changes - mode code reuse, better function naming, logic simplifications. - "mm: some small page fault cleanups" from Josef Bacik. No functional changes - code cleanups only. - "Various memory tiering fixes" from Zi Yan. A small fix and a little cleanup. - "mm/swap: remove boilerplate" from Yu Zhao. Code cleanups and simplifications and .text shrinkage. - "Kernel stack usage histogram" from Pasha Tatashin and Shakeel Butt. This is a feature, it adds new feilds to /proc/vmstat such as $ grep kstack /proc/vmstat kstack_1k 3 kstack_2k 188 kstack_4k 11391 kstack_8k 243 kstack_16k 0 which tells us that 11391 processes used 4k of stack while none at all used 16k. Useful for some system tuning things, but partivularly useful for "the dynamic kernel stack project". - "kmemleak: support for percpu memory leak detect" from Pavel Tikhomirov. Teaches kmemleak to detect leaksage of percpu memory. - "mm: memcg: page counters optimizations" from Roman Gushchin. "3 independent small optimizations of page counters". - "mm: split PTE/PMD PT table Kconfig cleanups+clarifications" from David Hildenbrand. Improves PTE/PMD splitlock detection, makes powerpc/8xx work correctly by design rather than by accident. - "mm: remove arch_make_page_accessible()" from David Hildenbrand. Some folio conversions which make arch_make_page_accessible() unneeded. - "mm, memcg: cg2 memory{.swap,}.peak write handlers" fro David Finkel. Cleans up and fixes our handling of the resetting of the cgroup/process peak-memory-use detector. - "Make core VMA operations internal and testable" from Lorenzo Stoakes. Rationalizaion and encapsulation of the VMA manipulation APIs. With a view to better enable testing of the VMA functions, even from a userspace-only harness. - "mm: zswap: fixes for global shrinker" from Takero Funaki. Fix issues in the zswap global shrinker, resulting in improved performance. - "mm: print the promo watermark in zoneinfo" from Kaiyang Zhao. Fill in some missing info in /proc/zoneinfo. - "mm: replace follow_page() by folio_walk" from David Hildenbrand. Code cleanups and rationalizations (conversion to folio_walk()) resulting in the removal of follow_page(). - "improving dynamic zswap shrinker protection scheme" from Nhat Pham. Some tuning to improve zswap's dynamic shrinker. Significant reductions in swapin and improvements in performance are shown. - "mm: Fix several issues with unaccepted memory" from Kirill Shutemov. Improvements to the new unaccepted memory feature, - "mm/mprotect: Fix dax puds" from Peter Xu. Implements mprotect on DAX PUDs. This was missing, although nobody seems to have notied yet. - "Introduce a store type enum for the Maple tree" from Sidhartha Kumar. Cleanups and modest performance improvements for the maple tree library code. - "memcg: further decouple v1 code from v2" from Shakeel Butt. Move more cgroup v1 remnants away from the v2 memcg code. - "memcg: initiate deprecation of v1 features" from Shakeel Butt. Adds various warnings telling users that memcg v1 features are deprecated. - "mm: swap: mTHP swap allocator base on swap cluster order" from Chris Li. Greatly improves the success rate of the mTHP swap allocation. - "mm: introduce numa_memblks" from Mike Rapoport. Moves various disparate per-arch implementations of numa_memblk code into generic code. - "mm: batch free swaps for zap_pte_range()" from Barry Song. Greatly improves the performance of munmap() of swap-filled ptes. - "support large folio swap-out and swap-in for shmem" from Baolin Wang. With this series we no longer split shmem large folios into simgle-page folios when swapping out shmem. - "mm/hugetlb: alloc/free gigantic folios" from Yu Zhao. Nice performance improvements and code reductions for gigantic folios. - "support shmem mTHP collapse" from Baolin Wang. Adds support for khugepaged's collapsing of shmem mTHP folios. - "mm: Optimize mseal checks" from Pedro Falcato. Fixes an mprotect() performance regression due to the addition of mseal(). - "Increase the number of bits available in page_type" from Matthew Wilcox. Increases the number of bits available in page_type! - "Simplify the page flags a little" from Matthew Wilcox. Many legacy page flags are now folio flags, so the page-based flags and their accessors/mutators can be removed. - "mm: store zero pages to be swapped out in a bitmap" from Usama Arif. An optimization which permits us to avoid writing/reading zero-filled zswap pages to backing store. - "Avoid MAP_FIXED gap exposure" from Liam Howlett. Fixes a race window which occurs when a MAP_FIXED operqtion is occurring during an unrelated vma tree walk. - "mm: remove vma_merge()" from Lorenzo Stoakes. Major rotorooting of the vma_merge() functionality, making ot cleaner, more testable and better tested. - "misc fixups for DAMON {self,kunit} tests" from SeongJae Park. Minor fixups of DAMON selftests and kunit tests. - "mm: memory_hotplug: improve do_migrate_range()" from Kefeng Wang. Code cleanups and folio conversions. - "Shmem mTHP controls and stats improvements" from Ryan Roberts. Cleanups for shmem controls and stats. - "mm: count the number of anonymous THPs per size" from Barry Song. Expose additional anon THP stats to userspace for improved tuning. - "mm: finish isolate/putback_lru_page()" from Kefeng Wang: more folio conversions and removal of now-unused page-based APIs. - "replace per-quota region priorities histogram buffer with per-context one" from SeongJae Park. DAMON histogram rationalization. - "Docs/damon: update GitHub repo URLs and maintainer-profile" from SeongJae Park. DAMON documentation updates. - "mm/vdpa: correct misuse of non-direct-reclaim __GFP_NOFAIL and improve related doc and warn" from Jason Wang: fixes usage of page allocator __GFP_NOFAIL and GFP_ATOMIC flags. - "mm: split underused THPs" from Yu Zhao. Improve THP=always policy. This was overprovisioning THPs in sparsely accessed memory areas. - "zram: introduce custom comp backends API" frm Sergey Senozhatsky. Add support for zram run-time compression algorithm tuning. - "mm: Care about shadow stack guard gap when getting an unmapped area" from Mark Brown. Fix up the various arch_get_unmapped_area() implementations to better respect guard areas. - "Improve mem_cgroup_iter()" from Kinsey Ho. Improve the reliability of mem_cgroup_iter() and various code cleanups. - "mm: Support huge pfnmaps" from Peter Xu. Extends the usage of huge pfnmap support. - "resource: Fix region_intersects() vs add_memory_driver_managed()" from Huang Ying. Fix a bug in region_intersects() for systems with CXL memory. - "mm: hwpoison: two more poison recovery" from Kefeng Wang. Teaches a couple more code paths to correctly recover from the encountering of poisoned memry. - "mm: enable large folios swap-in support" from Barry Song. Support the swapin of mTHP memory into appropriately-sized folios, rather than into single-page folios" * tag 'mm-stable-2024-09-20-02-31' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (416 commits) zram: free secondary algorithms names uprobes: turn xol_area->pages[2] into xol_area->page uprobes: introduce the global struct vm_special_mapping xol_mapping Revert "uprobes: use vm_special_mapping close() functionality" mm: support large folios swap-in for sync io devices mm: add nr argument in mem_cgroup_swapin_uncharge_swap() helper to support large folios mm: fix swap_read_folio_zeromap() for large folios with partial zeromap mm/debug_vm_pgtable: Use pxdp_get() for accessing page table entries set_memory: add __must_check to generic stubs mm/vma: return the exact errno in vms_gather_munmap_vmas() memcg: cleanup with !CONFIG_MEMCG_V1 mm/show_mem.c: report alloc tags in human readable units mm: support poison recovery from copy_present_page() mm: support poison recovery from do_cow_fault() resource, kunit: add test case for region_intersects() resource: make alloc_free_mem_region() works for iomem_resource mm: z3fold: deprecate CONFIG_Z3FOLD vfio/pci: implement huge_fault support mm/arm64: support large pfn mappings mm/x86: support large pfn mappings ...

Merge branch 'slab/for-6.12/kmem_cache_args' into slab/for-next

2024-09-13T09:13:03Z

Merge kmem_cache_create() refactoring by Christian Brauner. Note this includes a merge of the vfs.file tree that contains the prerequisity kmem_cache_create_rcu() work.

mm, slab: restore kerneldoc for kmem_cache_create()

2024-09-13T09:05:01Z

As kmem_cache_create() became a _Generic() wrapper macro, it currently has no kerneldoc despite being the main API to use. Add it. Also adjust kmem_cache_create_usercopy() kerneldoc to indicate it is now a legacy wrapper. Also expand the kerneldoc for struct kmem_cache_args, especially for the freeptr_offset field, where important details were removed with the removal of kmem_cache_create_rcu(). Signed-off-by: Vlastimil Babka Reviewed-by: Christian Brauner

slab: make __kmem_cache_create() static inline

2024-09-10T09:42:59Z

Make __kmem_cache_create() a static inline function. Signed-off-by: Christian Brauner Reviewed-by: Mike Rapoport (Microsoft) Reviewed-by: Roman Gushchin Signed-off-by: Vlastimil Babka

slab: make kmem_cache_create_usercopy() static inline

2024-09-10T09:42:58Z

Make kmem_cache_create_usercopy() a static inline function. Signed-off-by: Christian Brauner Reviewed-by: Mike Rapoport (Microsoft) Reviewed-by: Roman Gushchin Signed-off-by: Vlastimil Babka

slab: remove kmem_cache_create_rcu()

2024-09-10T09:42:58Z

Now that we have ported all users of kmem_cache_create_rcu() to struct kmem_cache_args the function is unused and can be removed. Reviewed-by: Kees Cook Reviewed-by: Jens Axboe Reviewed-by: Mike Rapoport (Microsoft) Reviewed-by: Vlastimil Babka Signed-off-by: Christian Brauner Reviewed-by: Roman Gushchin Signed-off-by: Vlastimil Babka

slab: create kmem_cache_create() compatibility layer

2024-09-10T09:42:58Z

Use _Generic() to create a compatibility layer that type switches on the third argument to either call __kmem_cache_create() or __kmem_cache_create_args(). If NULL is passed for the struct kmem_cache_args argument use default args making porting for callers that don't care about additional arguments easy. Reviewed-by: Kees Cook Reviewed-by: Jens Axboe Signed-off-by: Christian Brauner Reviewed-by: Mike Rapoport (Microsoft) Reviewed-by: Roman Gushchin Signed-off-by: Vlastimil Babka