linux-toradex.git/kernel/module/main.c, branch v6.13-rc3

Merge tag 'modules-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/modules/linux

2024-11-27T18:20:50+00:00

Pull modules updates from Luis Chamberlain:

 - The whole caching of module code into huge pages by Mike Rapoport is
   going in through Andrew Morton's tree due to some other code
   dependencies. That's really the biggest highlight for Linux kernel
   modules in this release. With it we share huge pages for modules,
   starting off with x86. Expect to see that soon through Andrew!

 - Helge Deller addressed some lingering low hanging fruit alignment
   enhancements by. It is worth pointing out that from his old patch
   series I dropped his vmlinux.lds.h change at Masahiro's request as he
   would prefer this to be specified in asm code [0].

    [0] https://lore.kernel.org/all/20240129192644.3359978-5-mcgrof@kernel.org/T/#m9efef5e700fbecd28b7afb462c15eed8ba78ef5a

 - Matthew Maurer and Sami Tolvanen have been tag teaming to help get us
   closer to a modversions for Rust. In this cycle we take in quite a
   lot of the refactoring for ELF validation. I expect modversions for
   Rust will be merged by v6.14 as that code is mostly ready now.

 - Adds a new modules selftests: kallsyms which helps us tests
   find_symbol() and the limits of kallsyms on Linux today.

 - We have a realtime mailing list to kernel-ci testing for modules now
   which relies and combines patchwork, kpd and kdevops:

     https://patchwork.kernel.org/project/linux-modules/list/
     https://github.com/linux-kdevops/kdevops/blob/main/docs/kernel-ci/README.md
     https://github.com/linux-kdevops/kdevops/blob/main/docs/kernel-ci/kernel-ci-kpd.md
     https://github.com/linux-kdevops/kdevops/blob/main/docs/kernel-ci/linux-modules-kdevops-ci.md

   If you want to help avoid Linux kernel modules regressions, now its
   simple, just add a new Linux modules sefltests under
   tools/testing/selftests/module/ That is it. All new selftests will be
   used and leveraged automatically by the CI.

* tag 'modules-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/modules/linux:
  tests/module/gen_test_kallsyms.sh: use 0 value for variables
  scripts: Remove export_report.pl
  selftests: kallsyms: add MODULE_DESCRIPTION
  selftests: add new kallsyms selftests
  module: Reformat struct for code style
  module: Additional validation in elf_validity_cache_strtab
  module: Factor out elf_validity_cache_strtab
  module: Group section index calculations together
  module: Factor out elf_validity_cache_index_str
  module: Factor out elf_validity_cache_index_sym
  module: Factor out elf_validity_cache_index_mod
  module: Factor out elf_validity_cache_index_info
  module: Factor out elf_validity_cache_secstrings
  module: Factor out elf_validity_cache_sechdrs
  module: Factor out elf_validity_ehdr
  module: Take const arg in validate_section_offset
  modules: Add missing entry for __ex_table
  modules: Ensure 64-bit alignment on __ksymtab_* sections

Merge tag 'mm-stable-2024-11-18-19-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2024-11-23T17:58:07+00:00

Pull MM updates from Andrew Morton:

- The series "zram: optimal post-processing target selection" from
Sergey Senozhatsky improves zram's post-processing selection
algorithm. This leads to improved memory savings.

- Wei Yang has gone to town on the mapletree code, contributing several
series which clean up the implementation:
- "refine mas_mab_cp()"
- "Reduce the space to be cleared for maple_big_node"
- "maple_tree: simplify mas_push_node()"
- "Following cleanup after introduce mas_wr_store_type()"
- "refine storing null"

- The series "selftests/mm: hugetlb_fault_after_madv improvements" from
David Hildenbrand fixes this selftest for s390.

- The series "introduce pte_offset_map_{ro|rw}_nolock()" from Qi Zheng
implements some rationaizations and cleanups in the page mapping
code.

- The series "mm: optimize shadow entries removal" from Shakeel Butt
optimizes the file truncation code by speeding up the handling of
shadow entries.

- The series "Remove PageKsm()" from Matthew Wilcox completes the
migration of this flag over to being a folio-based flag.

- The series "Unify hugetlb into arch_get_unmapped_area functions" from
Oscar Salvador implements a bunch of consolidations and cleanups in
the hugetlb code.

- The series "Do not shatter hugezeropage on wp-fault" from Dev Jain
takes away the wp-fault time practice of turning a huge zero page
into small pages. Instead we replace the whole thing with a THP. More
consistent cleaner and potentiall saves a large number of pagefaults.

- The series "percpu: Add a test case and fix for clang" from Andy
Shevchenko enhances and fixes the kernel's built in percpu test code.

- The series "mm/mremap: Remove extra vma tree walk" from Liam Howlett
optimizes mremap() by avoiding doing things which we didn't need to
do.

- The series "Improve the tmpfs large folio read performance" from
Baolin Wang teaches tmpfs to copy data into userspace at the folio
size rather than as individual pages. A 20% speedup was observed.

- The series "mm/damon/vaddr: Fix issue in
damon_va_evenly_split_region()" fro Zheng Yejian fixes DAMON
splitting.

- The series "memcg-v1: fully deprecate charge moving" from Shakeel
Butt removes the long-deprecated memcgv2 charge moving feature.

- The series "fix error handling in mmap_region() and refactor" from
Lorenzo Stoakes cleanup up some of the mmap() error handling and
addresses some potential performance issues.

- The series "x86/module: use large ROX pages for text allocations"
from Mike Rapoport teaches x86 to use large pages for
read-only-execute module text.

- The series "page allocation tag compression" from Suren Baghdasaryan
is followon maintenance work for the new page allocation profiling
feature.

- The series "page->index removals in mm" from Matthew Wilcox remove
most references to page->index in mm/. A slow march towards shrinking
struct page.

- The series "damon/{self,kunit}tests: minor fixups for DAMON debugfs
interface tests" from Andrew Paniakin performs maintenance work for
DAMON's self testing code.

- The series "mm: zswap swap-out of large folios" from Kanchana Sridhar
improves zswap's batching of compression and decompression. It is a
step along the way towards using Intel IAA hardware acceleration for
this zswap operation.

- The series "kasan: migrate the last module test to kunit" from
Sabyrzhan Tasbolatov completes the migration of the KASAN built-in
tests over to the KUnit framework.

- The series "implement lightweight guard pages" from Lorenzo Stoakes
permits userapace to place fault-generating guard pages within a
single VMA, rather than requiring that multiple VMAs be created for
this. Improved efficiencies for userspace memory allocators are
expected.

- The series "memcg: tracepoint for flushing stats" from JP Kobryn uses
tracepoints to provide increased visibility into memcg stats flushing
activity.

- The series "zram: IDLE flag handling fixes" from Sergey Senozhatsky
fixes a zram buglet which potentially affected performance.

- The series "mm: add more kernel parameters to control mTHP" from
Maíra Canal enhances our ability to control/configuremultisize THP
from the kernel boot command line.

- The series "kasan: few improvements on kunit tests" from Sabyrzhan
Tasbolatov has a couple of fixups for the KASAN KUnit tests.

- The series "mm/list_lru: Split list_lru lock into per-cgroup scope"
from Kairui Song optimizes list_lru memory utilization when lockdep
is enabled.

* tag 'mm-stable-2024-11-18-19-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (215 commits)
cma: enforce non-zero pageblock_order during cma_init_reserved_mem()
mm/kfence: add a new kunit test test_use_after_free_read_nofault()
zram: fix NULL pointer in comp_algorithm_show()
memcg/hugetlb: add hugeTLB counters to memcg
vmstat: call fold_vm_zone_numa_events() before show per zone NUMA event
mm: mmap_lock: check trace_mmap_lock_$type_enabled() instead of regcount
zram: ZRAM_DEF_COMP should depend on ZRAM
MAINTAINERS/MEMORY MANAGEMENT: add document files for mm
Docs/mm/damon: recommend academic papers to read and/or cite
mm: define general function pXd_init()
kmemleak: iommu/iova: fix transient kmemleak false positive
mm/list_lru: simplify the list_lru walk callback function
mm/list_lru: split the lock to per-cgroup scope
mm/list_lru: simplify reparenting and initial allocation
mm/list_lru: code clean up for reparenting
mm/list_lru: don't export list_lru_add
mm/list_lru: don't pass unnecessary key parameters
kasan: add kunit tests for kmalloc_track_caller, kmalloc_node_track_caller
kasan: change kasan_atomics kunit test as KUNIT_CASE_SLOW
kasan: use EXPORT_SYMBOL_IF_KUNIT to export symbols
...

alloc_tag: load module tags into separate contiguous memory

2024-11-07T22:25:16+00:00

When a module gets unloaded there is a possibility that some of the
allocations it made are still used and therefore the allocation tags
corresponding to these allocations are still referenced.  As such, the
memory for these tags can't be freed.  This is currently handled as an
abnormal situation and module's data section is not being unloaded.  To
handle this situation without keeping module's data in memory, allow
codetags with longer lifespan than the module to be loaded into their own
separate memory.  The in-use memory areas and gaps after module unloading
in this separate memory are tracked using maple trees.  Allocation tags
arrange their separate memory so that it is virtually contiguous and that
will allow simple allocation tag indexing later on in this patchset.  The
size of this virtually contiguous memory is set to store up to 100000
allocation tags.

[surenb@google.com: fix empty codetag module section handling]
  Link: https://lkml.kernel.org/r/20241101000017.3856204-1-surenb@google.com
[akpm@linux-foundation.org: update comment, per Dan]
Link: https://lkml.kernel.org/r/20241023170759.999909-4-surenb@google.com
Signed-off-by: Suren Baghdasaryan 
Reviewed-by: Pasha Tatashin 
Cc: Ard Biesheuvel 
Cc: Arnd Bergmann 
Cc: Borislav Petkov (AMD) 
Cc: Christoph Hellwig 
Cc: Daniel Gomez 
Cc: David Hildenbrand 
Cc: Davidlohr Bueso 
Cc: David Rientjes 
Cc: Dennis Zhou 
Cc: Johannes Weiner 
Cc: John Hubbard 
Cc: Jonathan Corbet 
Cc: Joonsoo Kim 
Cc: Kalesh Singh 
Cc: Kees Cook 
Cc: Kent Overstreet 
Cc: Liam R. Howlett 
Cc: Luis Chamberlain 
Cc: Matthew Wilcox 
Cc: Michal Hocko 
Cc: Mike Rapoport (Microsoft) 
Cc: Minchan Kim 
Cc: Paul E. McKenney 
Cc: Petr Pavlu 
Cc: Roman Gushchin 
Cc: Sami Tolvanen 
Cc: Sourav Panda 
Cc: Steven Rostedt (Google) 
Cc: Thomas Gleixner 
Cc: Thomas Huth 
Cc: Uladzislau Rezki (Sony) 
Cc: Vlastimil Babka 
Cc: Xiongwei Song 
Cc: Yu Zhao 
Cc: Dan Carpenter 
Signed-off-by: Andrew Morton

module: prepare to handle ROX allocations for text

2024-11-07T22:25:15+00:00

In order to support ROX allocations for module text, it is necessary to
handle modifications to the code, such as relocations and alternatives
patching, without write access to that memory.

One option is to use text patching, but this would make module loading
extremely slow and will expose executable code that is not finally formed.

A better way is to have memory allocated with ROX permissions contain
invalid instructions and keep a writable, but not executable copy of the
module text.  The relocations and alternative patches would be done on the
writable copy using the addresses of the ROX memory.  Once the module is
completely ready, the updated text will be copied to ROX memory using text
patching in one go and the writable copy will be freed.

Add support for that to module initialization code and provide necessary
interfaces in execmem.

Link: https://lkml.kernel.org/r/20241023162711.2579610-5-rppt@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) 
Reviewd-by: Luis Chamberlain 
Tested-by: kdevops 
Cc: Andreas Larsson 
Cc: Andy Lutomirski 
Cc: Ard Biesheuvel 
Cc: Arnd Bergmann 
Cc: Borislav Petkov (AMD) 
Cc: Brian Cain 
Cc: Catalin Marinas 
Cc: Christophe Leroy 
Cc: Christoph Hellwig 
Cc: Dave Hansen 
Cc: Dinh Nguyen 
Cc: Geert Uytterhoeven 
Cc: Guo Ren 
Cc: Helge Deller 
Cc: Huacai Chen 
Cc: Ingo Molnar 
Cc: Johannes Berg 
Cc: John Paul Adrian Glaubitz 
Cc: Kent Overstreet 
Cc: Liam R. Howlett 
Cc: Mark Rutland 
Cc: Masami Hiramatsu (Google) 
Cc: Matt Turner 
Cc: Max Filippov 
Cc: Michael Ellerman 
Cc: Michal Simek 
Cc: Oleg Nesterov 
Cc: Palmer Dabbelt 
Cc: Peter Zijlstra 
Cc: Richard Weinberger 
Cc: Russell King 
Cc: Song Liu 
Cc: Stafford Horne 
Cc: Steven Rostedt (Google) 
Cc: Suren Baghdasaryan 
Cc: Thomas Bogendoerfer 
Cc: Thomas Gleixner 
Cc: Uladzislau Rezki (Sony) 
Cc: Vineet Gupta 
Cc: Will Deacon 
Signed-off-by: Andrew Morton

fdget(), more trivial conversions

2024-11-03T06:28:06+00:00

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

regularize emptiness checks in fini_module(2) and vfs_dedupe_file_range()

2024-11-03T06:28:06+00:00

With few exceptions emptiness checks are done as fd_file(...) in boolean
context (usually something like if (!fd_file(f))...); those will be
taken care of later.

However, there's a couple of places where we do those checks as
'store fd_file(...) into a variable, then check if this variable is
NULL' and those are harder to spot.

Get rid of those now.

use fd_empty() instead of extracting file and then checking it for NULL.

Reviewed-by: Christian Brauner 
Signed-off-by: Al Viro

module: Additional validation in elf_validity_cache_strtab

2024-10-19T21:35:07+00:00

Validate properties of the strtab that are depended on elsewhere, but
were previously unchecked:
* String table nonempty (offset 0 is valid)
* String table has a leading NUL (offset 0 corresponds to "")
* String table is NUL terminated (strfoo functions won't run out of the
  table while reading).
* All symbols names are inbounds of the string table.

Signed-off-by: Matthew Maurer 
Reviewed-by: Sami Tolvanen 
Signed-off-by: Luis Chamberlain

module: Factor out elf_validity_cache_strtab

2024-10-19T21:35:07+00:00

This patch only moves the existing strtab population to a function.
Validation comes in a following patch, this is split out to make the new
validation checks more clearly separated.

Signed-off-by: Matthew Maurer 
Reviewed-by: Sami Tolvanen 
Signed-off-by: Luis Chamberlain

module: Group section index calculations together

2024-10-19T21:35:07+00:00

Group all the index detection together to make the parent function
easier to read.

Signed-off-by: Matthew Maurer 
Reviewed-by: Sami Tolvanen 
Signed-off-by: Luis Chamberlain

module: Factor out elf_validity_cache_index_str

2024-10-19T21:35:07+00:00

Pull out index validation for the symbol string section.

Note that this does not validate the *contents* of the string table,
only shape and presence of the section.

Signed-off-by: Matthew Maurer 
Reviewed-by: Sami Tolvanen 
Signed-off-by: Luis Chamberlain