This converts some of the visually simpler cases that have been split
over multiple lines. I only did the ones that are easy to verify the
resulting diff by having just that final GFP_KERNEL argument on the next
line.
Somebody should probably do a proper coccinelle script for this, but for
me the trivial script actually resulted in an assertion failure in the
middle of the script. I probably had made it a bit _too_ trivial.
So after fighting that far a while I decided to just do some of the
syntactically simpler cases with variations of the previous 'sed'
scripts.
The more syntactically complex multi-line cases would mostly really want
whitespace cleanup anyway.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This is the exact same thing as the 'alloc_obj()' version, only much
smaller because there are a lot fewer users of the *alloc_flex()
interface.
As with alloc_obj() version, this was done entirely with mindless brute
force, using the same script, except using 'flex' in the pattern rather
than 'objs*'.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This was done entirely with mindless brute force, using
git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'
to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.
Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.
For the same reason the 'flex' versions will be done as a separate
conversion.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This is the result of running the Coccinelle script from
scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to
avoid scalar types (which need careful case-by-case checking), and
instead replace kmalloc-family calls that allocate struct or union
object instances:
Single allocations: kmalloc(sizeof(TYPE), ...)
are replaced with: kmalloc_obj(TYPE, ...)
Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...)
are replaced with: kmalloc_objs(TYPE, COUNT, ...)
Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...)
are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...)
(where TYPE may also be *VAR)
The resulting allocations no longer return "void *", instead returning
"TYPE *".
Signed-off-by: Kees Cook <kees@kernel.org>
Pull AppArmor updates from John Johansen:
"Features:
- add .kunitconfig
- audit execpath in userns mediation
- add support loading per permission tagging
Cleanups:
- remove unused percpu critical sections in buffer management
- document the buffer hold, add an overflow guard
- split xxx_in_ns into its two separate semantic use cases
- remove apply_modes_to_perms from label_match
- refactor/cleanup cred helper fns.
- guard against free attachment/data routines being called with NULL
- drop in_atomic flag in common_mmap, common_file_perm, and cleanup
- make str table more generic and be able to have multiple entries
- Replace deprecated strcpy with memcpy in gen_symlink_name
- Replace deprecated strcpy in d_namespace_path
- Replace sprintf/strcpy with scnprintf/strscpy in aa_policy_init
- replace sprintf with snprintf in aa_new_learning_profile
Bug Fixes:
- fix cast in format string DEBUG statement
- fix make aa_labelmatch return consistent
- fix fmt string type error in process_strs_entry
- fix kernel-doc comments for inview
- fix invalid deref of rawdata when export_binary is unset
- avoid per-cpu hold underflow in aa_get_buffer
- fix fast path cache check for unix sockets
- fix rlimit for posix cpu timers
- fix label and profile debug macros
- move check for aa_null file to cover all cases
- return -ENOMEM in unpack_perms_table upon alloc failure
- fix boolean argument in apparmor_mmap_file
- Fix & Optimize table creation from possibly unaligned memory
- Allow apparmor to handle unaligned dfa tables
- fix NULL deref in aa_sock_file_perm
- fix NULL pointer dereference in __unix_needs_revalidation
- fix signedness bug in unpack_tags()"
* tag 'apparmor-pr-2026-02-18' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor: (34 commits)
apparmor: fix signedness bug in unpack_tags()
apparmor: fix cast in format string DEBUG statement
apparmor: fix aa_label to return state from compount and component match
apparmor: fix fmt string type error in process_strs_entry
apparmor: fix kernel-doc comments for inview
apparmor: fix invalid deref of rawdata when export_binary is unset
apparmor: add .kunitconfig
apparmor: cleanup remove unused percpu critical sections in buffer management
apparmor: document the buffer hold, add an overflow guard
apparmor: avoid per-cpu hold underflow in aa_get_buffer
apparmor: split xxx_in_ns into its two separate semantic use cases
apparmor: make label_match return a consistent value
apparmor: remove apply_modes_to_perms from label_match
apparmor: fix fast path cache check for unix sockets
apparmor: fix rlimit for posix cpu timers
apparmor: refactor/cleanup cred helper fns.
apparmor: fix label and profile debug macros
apparmor: move check for aa_null file to cover all cases
apparmor: guard against free routines being called with a NULL
apparmor: return -ENOMEM in unpack_perms_table upon alloc failure
...
Pull more MM updates from Andrew Morton:
- "mm/vmscan: fix demotion targets checks in reclaim/demotion" fixes a
couple of issues in the demotion code - pages were failed demotion
and were finding themselves demoted into disallowed nodes (Bing Jiao)
- "Remove XA_ZERO from error recovery of dup_mmap()" fixes a rare
mapledtree race and performs a number of cleanups (Liam Howlett)
- "mm: add bitmap VMA flag helpers and convert all mmap_prepare to use
them" implements a lot of cleanups following on from the conversion
of the VMA flags into a bitmap (Lorenzo Stoakes)
- "support batch checking of references and unmapping for large folios"
implements batching to greatly improve the performance of reclaiming
clean file-backed large folios (Baolin Wang)
- "selftests/mm: add memory failure selftests" does as claimed (Miaohe
Lin)
* tag 'mm-stable-2026-02-18-19-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (36 commits)
mm/page_alloc: clear page->private in free_pages_prepare()
selftests/mm: add memory failure dirty pagecache test
selftests/mm: add memory failure clean pagecache test
selftests/mm: add memory failure anonymous page test
mm: rmap: support batched unmapping for file large folios
arm64: mm: implement the architecture-specific clear_flush_young_ptes()
arm64: mm: support batch clearing of the young flag for large folios
arm64: mm: factor out the address and ptep alignment into a new helper
mm: rmap: support batched checks of the references for large folios
tools/testing/vma: add VMA userland tests for VMA flag functions
tools/testing/vma: separate out vma_internal.h into logical headers
tools/testing/vma: separate VMA userland tests into separate files
mm: make vm_area_desc utilise vma_flags_t only
mm: update all remaining mmap_prepare users to use vma_flags_t
mm: update shmem_[kernel]_file_*() functions to use vma_flags_t
mm: update secretmem to use VMA flags on mmap_prepare
mm: update hugetlbfs to use VMA flags on mmap_prepare
mm: add basic VMA flag operation helper functions
tools: bitmap: add missing bitmap_[subset(), andnot()]
mm: add mk_vma_flags() bitmap flag macro helper
...
Smatch static checker warning:
security/apparmor/policy_unpack.c:966 unpack_pdb()
warn: unsigned 'unpack_tags(e, &pdb->tags, info)' is never less than zero.
unpack_tags() is declared with return type size_t (unsigned) but returns
negative errno values on failure. The caller in unpack_pdb() tests the
return with `< 0`, which is always false for an unsigned type, making
error handling dead code. Malformed tag data would be silently accepted
instead of causing a load failure.
Change return type of unpack_tags() from size_t to int to match the
functions's actual semantic.
Fixes: 3d28e2397a ("apparmor: add support loading per permission tagging")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Massimiliano Pellizzer <mpellizzer.dev@gmail.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Pull sysctl updates from Joel Granados:
- Remove macros from proc handler converters
Replace the proc converter macros with "regular" functions. Though it
is more verbose than the macro version, it helps when debugging and
better aligns with coding-style.rst.
- General cleanup
Remove superfluous ctl_table forward declarations. Const qualify the
memory_allocation_profiling_sysctl and loadpin_sysctl_table arrays.
Add missing kernel doc to proc_dointvec_conv.
- Testing
This series was run through sysctl selftests/kunit test suite in
x86_64. And went into linux-next after rc4, giving it a good 3 weeks
of testing
* tag 'sysctl-7.00-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/sysctl/sysctl:
sysctl: replace SYSCTL_INT_CONV_CUSTOM macro with functions
sysctl: Replace unidirectional INT converter macros with functions
sysctl: Add kernel doc to proc_douintvec_conv
sysctl: Replace UINT converter macros with functions
sysctl: Add CONFIG_PROC_SYSCTL guards for converter macros
sysctl: clarify proc_douintvec_minmax doc
sysctl: Return -ENOSYS from proc_douintvec_conv when CONFIG_PROC_SYSCTL=n
sysctl: Remove unused ctl_table forward declarations
loadpin: Implement custom proc_handler for enforce
alloc_tag: move memory_allocation_profiling_sysctls into .rodata
sysctl: Add missing kernel-doc for proc_dointvec_conv
Pull capabilities updates from Serge Hallyn:
- add KUnit tests for some core capabilities helpers
- avoid emitting IPC audit messages when there's not
actually a permission being denied
* tag 'caps-pr-20260213' of git://git.kernel.org/pub/scm/linux/kernel/git/sergeh/linux:
ipc: don't audit capability check in ipc_permissions()
security: Add KUnit tests for kuid_root_in_ns and vfsuid_root_in_currentns
Pull non-MM updates from Andrew Morton:
- "ocfs2: give ocfs2 the ability to reclaim suballocator free bg" saves
disk space by teaching ocfs2 to reclaim suballocator block group
space (Heming Zhao)
- "Add ARRAY_END(), and use it to fix off-by-one bugs" adds the
ARRAY_END() macro and uses it in various places (Alejandro Colomar)
- "vmcoreinfo: support VMCOREINFO_BYTES larger than PAGE_SIZE" makes
the vmcore code future-safe, if VMCOREINFO_BYTES ever exceeds the
page size (Pnina Feder)
- "kallsyms: Prevent invalid access when showing module buildid" cleans
up kallsyms code related to module buildid and fixes an invalid
access crash when printing backtraces (Petr Mladek)
- "Address page fault in ima_restore_measurement_list()" fixes a
kexec-related crash that can occur when booting the second-stage
kernel on x86 (Harshit Mogalapalli)
- "kho: ABI headers and Documentation updates" updates the kexec
handover ABI documentation (Mike Rapoport)
- "Align atomic storage" adds the __aligned attribute to atomic_t and
atomic64_t definitions to get natural alignment of both types on
csky, m68k, microblaze, nios2, openrisc and sh (Finn Thain)
- "kho: clean up page initialization logic" simplifies the page
initialization logic in kho_restore_page() (Pratyush Yadav)
- "Unload linux/kernel.h" moves several things out of kernel.h and into
more appropriate places (Yury Norov)
- "don't abuse task_struct.group_leader" removes the usage of
->group_leader when it is "obviously unnecessary" (Oleg Nesterov)
- "list private v2 & luo flb" adds some infrastructure improvements to
the live update orchestrator (Pasha Tatashin)
* tag 'mm-nonmm-stable-2026-02-12-10-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (107 commits)
watchdog/hardlockup: simplify perf event probe and remove per-cpu dependency
procfs: fix missing RCU protection when reading real_parent in do_task_stat()
watchdog/softlockup: fix sample ring index wrap in need_counting_irqs()
kcsan, compiler_types: avoid duplicate type issues in BPF Type Format
kho: fix doc for kho_restore_pages()
tests/liveupdate: add in-kernel liveupdate test
liveupdate: luo_flb: introduce File-Lifecycle-Bound global state
liveupdate: luo_file: Use private list
list: add kunit test for private list primitives
list: add primitives for private list manipulations
delayacct: fix uapi timespec64 definition
panic: add panic_force_cpu= parameter to redirect panic to a specific CPU
netclassid: use thread_group_leader(p) in update_classid_task()
RDMA/umem: don't abuse current->group_leader
drm/pan*: don't abuse current->group_leader
drm/amd: kill the outdated "Only the pthreads threading model is supported" checks
drm/amdgpu: don't abuse current->group_leader
android/binder: use same_thread_group(proc->tsk, current) in binder_mmap()
android/binder: don't abuse current->group_leader
kho: skip memoryless NUMA nodes when reserving scratch areas
...
Pull landlock updates from Mickaël Salaün:
- extend Landlock to enforce restrictions on a whole process, similarly
to the seccomp's TSYNC flag
- refactor data structures to simplify code and improve performance
- add documentation to cover missing parts
* tag 'landlock-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mic/linux:
mailmap: Add entry for Mickaël Salaün
landlock: Transpose the layer masks data structure
landlock: Add access_mask_subset() helper
selftests/landlock: Add filesystem access benchmark
landlock: Document audit blocker field format
landlock: Add errata documentation section
landlock: Add backwards compatibility for restrict flags
landlock: Refactor TCP socket type check
landlock: Minor reword of docs for TCP access rights
landlock: Document LANDLOCK_RESTRICT_SELF_TSYNC
selftests/landlock: Add LANDLOCK_RESTRICT_SELF_TSYNC tests
landlock: Multithreading support for landlock_restrict_self()
Pull integrity updates from Mimi Zohar:
"Just two bug fixes: IMA's detecting scripts (bprm_creds_for_exec), and
calculating the EVM HMAC"
* tag 'integrity-v7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity:
evm: Use ordered xattrs list to calculate HMAC in evm_init_hmac()
ima: Fix stack-out-of-bounds in is_bprm_creds_for_exec()
Pull smack updates from Casey Schaufler:
"Two improvements to the code for setting the CIPSO Domain Of
Interpretation (DOI), a seldom used feature, and a formatting change"
* tag 'Smack-for-7.0' of https://github.com/cschaufler/smack-next:
smack: /smack/doi: accept previously used values
smack: /smack/doi must be > 0
security: smack: fix indentation in smack_access.c
Pull powerpc updates for 7.0
- Implement masked user access
- Add bpf support for internal only per-CPU instructions and inline the
bpf_get_smp_processor_id() and bpf_get_current_task() functions
- Fix pSeries MSI-X allocation failure when quota is exceeded
- Fix recursive pci_lock_rescan_remove locking in EEH event handling
- Support tailcalls with subprogs & BPF exceptions on 64bit
- Extend "trusted" keys to support the PowerVM Key Wrapping Module
(PKWM)
Thanks to Abhishek Dubey, Christophe Leroy, Gaurav Batra, Guangshuo Li,
Jarkko Sakkinen, Mahesh Salgaonkar, Mimi Zohar, Miquel Sabaté Solà, Nam
Cao, Narayana Murty N, Nayna Jain, Nilay Shroff, Puranjay Mohan, Saket
Kumar Bhaskar, Sourabh Jain, Srish Srinivasan, and Venkat Rao Bagalkote.
* tag 'powerpc-7.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (27 commits)
powerpc/pseries: plpks: export plpks_wrapping_is_supported
docs: trusted-encryped: add PKWM as a new trust source
keys/trusted_keys: establish PKWM as a trusted source
pseries/plpks: add HCALLs for PowerVM Key Wrapping Module
pseries/plpks: expose PowerVM wrapping features via the sysfs
powerpc/pseries: move the PLPKS config inside its own sysfs directory
pseries/plpks: fix kernel-doc comment inconsistencies
powerpc/smp: Add check for kcalloc() failure in parse_thread_groups()
powerpc: kgdb: Remove OUTBUFMAX constant
powerpc64/bpf: Additional NVR handling for bpf_throw
powerpc64/bpf: Support exceptions
powerpc64/bpf: Add arch_bpf_stack_walk() for BPF JIT
powerpc64/bpf: Avoid tailcall restore from trampoline
powerpc64/bpf: Support tailcalls with subprogs
powerpc64/bpf: Moving tail_call_cnt to bottom of frame
powerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling
powerpc/pseries: Fix MSI-X allocation failure when quota is exceeded
powerpc/iommu: bypass DMA APIs for coherent allocations for pre-mapped memory
powerpc64/bpf: Inline bpf_get_smp_processor_id() and bpf_get_current_task/_btf()
powerpc64/bpf: Support internal-only MOV instruction to resolve per-CPU addrs
...
Pull SoC driver updates from Arnd Bergmann:
"There are are a number of to firmware drivers, in particular the TEE
subsystem:
- a bus callback for TEE firmware that device drivers can register to
- sysfs support for tee firmware information
- minor updates to platform specific TEE drivers for AMD, NXP,
Qualcomm and the generic optee driver
- ARM SCMI firmware refactoring to improve the protocol discover
among other fixes and cleanups
- ARM FF-A firmware interoperability improvements
The reset controller and memory controller subsystems gain support for
additional hardware platforms from Mediatek, Renesas, NXP, Canaan and
SpacemiT.
Most of the other changes are for random drivers/soc code. Among a
number of cleanups and newly added hardware support, including:
- Mediatek MT8196 DVFS power management and mailbox support
- Qualcomm SCM firmware and MDT loader refactoring, as part of the
new Glymur platform support.
- NXP i.MX9 System Manager firmware support for accessing the syslog
- Minor updates for TI, Renesas, Samsung, Apple, Marvell and AMD
SoCs"
* tag 'soc-drivers-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (171 commits)
bus: fsl-mc: fix an error handling in fsl_mc_device_add()
reset: spacemit: Add SpacemiT K3 reset driver
reset: spacemit: Extract common K1 reset code
reset: Create subdirectory for SpacemiT drivers
dt-bindings: soc: spacemit: Add K3 reset support and IDs
reset: canaan: k230: drop OF dependency and enable by default
reset: rzg2l-usbphy-ctrl: Add suspend/resume support
reset: rzg2l-usbphy-ctrl: Propagate the return value of regmap_field_update_bits()
reset: gpio: check the return value of gpiod_set_value_cansleep()
reset: imx8mp-audiomix: Support i.MX8ULP SIM LPAV
reset: imx8mp-audiomix: Extend the driver usage
reset: imx8mp-audiomix: Switch to using regmap API
reset: imx8mp-audiomix: Drop unneeded macros
soc: fsl: qe: qe_ports_ic: Consolidate chained IRQ handler install/remove
soc: mediatek: mtk-cmdq: Add mminfra_offset adjustment for DRAM addresses
soc: mediatek: mtk-cmdq: Extend cmdq_pkt_write API for SoCs without subsys ID
soc: mediatek: mtk-cmdq: Add pa_base parsing for hardware without subsys ID support
soc: mediatek: mtk-cmdq: Add cmdq_get_mbox_priv() in cmdq_pkt_create()
mailbox: mtk-cmdq: Add driver data to support for MT8196
mailbox: mtk-cmdq: Add mminfra_offset configuration for DRAM transaction
...
Pull locking updates from Ingo Molnar:
"Lock debugging:
- Implement compiler-driven static analysis locking context checking,
using the upcoming Clang 22 compiler's context analysis features
(Marco Elver)
We removed Sparse context analysis support, because prior to
removal even a defconfig kernel produced 1,700+ context tracking
Sparse warnings, the overwhelming majority of which are false
positives. On an allmodconfig kernel the number of false positive
context tracking Sparse warnings grows to over 5,200... On the plus
side of the balance actual locking bugs found by Sparse context
analysis is also rather ... sparse: I found only 3 such commits in
the last 3 years. So the rate of false positives and the
maintenance overhead is rather high and there appears to be no
active policy in place to achieve a zero-warnings baseline to move
the annotations & fixers to developers who introduce new code.
Clang context analysis is more complete and more aggressive in
trying to find bugs, at least in principle. Plus it has a different
model to enabling it: it's enabled subsystem by subsystem, which
results in zero warnings on all relevant kernel builds (as far as
our testing managed to cover it). Which allowed us to enable it by
default, similar to other compiler warnings, with the expectation
that there are no warnings going forward. This enforces a
zero-warnings baseline on clang-22+ builds (Which are still limited
in distribution, admittedly)
Hopefully the Clang approach can lead to a more maintainable
zero-warnings status quo and policy, with more and more subsystems
and drivers enabling the feature. Context tracking can be enabled
for all kernel code via WARN_CONTEXT_ANALYSIS_ALL=y (default
disabled), but this will generate a lot of false positives.
( Having said that, Sparse support could still be added back,
if anyone is interested - the removal patch is still
relatively straightforward to revert at this stage. )
Rust integration updates: (Alice Ryhl, Fujita Tomonori, Boqun Feng)
- Add support for Atomic<i8/i16/bool> and replace most Rust native
AtomicBool usages with Atomic<bool>
- Clean up LockClassKey and improve its documentation
- Add missing Send and Sync trait implementation for SetOnce
- Make ARef Unpin as it is supposed to be
- Add __rust_helper to a few Rust helpers as a preparation for
helper LTO
- Inline various lock related functions to avoid additional function
calls
WW mutexes:
- Extend ww_mutex tests and other test-ww_mutex updates (John
Stultz)
Misc fixes and cleanups:
- rcu: Mark lockdep_assert_rcu_helper() __always_inline (Arnd
Bergmann)
- locking/local_lock: Include more missing headers (Peter Zijlstra)
- seqlock: fix scoped_seqlock_read kernel-doc (Randy Dunlap)
- rust: sync: Replace `kernel::c_str!` with C-Strings (Tamir
Duberstein)"
* tag 'locking-core-2026-02-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (90 commits)
locking/rwlock: Fix write_trylock_irqsave() with CONFIG_INLINE_WRITE_TRYLOCK
rcu: Mark lockdep_assert_rcu_helper() __always_inline
compiler-context-analysis: Remove __assume_ctx_lock from initializers
tomoyo: Use scoped init guard
crypto: Use scoped init guard
kcov: Use scoped init guard
compiler-context-analysis: Introduce scoped init guards
cleanup: Make __DEFINE_LOCK_GUARD handle commas in initializers
seqlock: fix scoped_seqlock_read kernel-doc
tools: Update context analysis macros in compiler_types.h
rust: sync: Replace `kernel::c_str!` with C-Strings
rust: sync: Inline various lock related methods
rust: helpers: Move #define __rust_helper out of atomic.c
rust: wait: Add __rust_helper to helpers
rust: time: Add __rust_helper to helpers
rust: task: Add __rust_helper to helpers
rust: sync: Add __rust_helper to helpers
rust: refcount: Add __rust_helper to helpers
rust: rcu: Add __rust_helper to helpers
rust: processor: Add __rust_helper to helpers
...
Pull keys update from David Howells:
"This adds support for ML-DSA signatures in X.509 certificates and
PKCS#7/CMS messages, thereby allowing this algorithm to be used for
signing modules, kexec'able binaries, wifi regulatory data, etc..
This requires OpenSSL-3.5 at a minimum and preferably OpenSSL-4 (so
that it can avoid the use of CMS signedAttrs - but that version is not
cut yet). certs/Kconfig does a check to hide the signing options if
OpenSSL does not list the algorithm as being available"
* tag 'keys-next-20260206' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
pkcs7: Change a pr_warn() to pr_warn_once()
pkcs7: Allow authenticatedAttributes for ML-DSA
modsign: Enable ML-DSA module signing
pkcs7, x509: Add ML-DSA support
pkcs7: Allow the signing algo to do whatever digestion it wants itself
pkcs7, x509: Rename ->digest to ->m
x509: Separately calculate sha256 for blacklist
crypto: Add ML-DSA crypto_sig support
The layer masks data structure tracks the requested but unfulfilled
access rights during an operation's security check. It stores one bit
for each combination of access right and layer index. If the bit is
set, that access right is not granted (yet) in the given layer and we
have to traverse the path further upwards to grant it.
Previously, the layer masks were stored as arrays mapping from access
right indices to layer_mask_t. The layer_mask_t value then indicates
all layers in which the given access right is still (tentatively)
denied.
This patch introduces struct layer_access_masks instead: This struct
contains an array with the access_mask_t of each (tentatively) denied
access right in that layer.
The hypothesis of this patch is that this simplifies the code enough
so that the resulting code will run faster:
* We can use bitwise operations in multiple places where we previously
looped over bits individually with macros. (Should require less
branch speculation and lends itself to better loop unrolling.)
* Code is ~75 lines smaller.
Other noteworthy changes:
* In no_more_access(), call a new helper function may_refer(), which
only solves the asymmetric case. Previously, the code interleaved
the checks for the two symmetric cases in RENAME_EXCHANGE. It feels
that the code is clearer when renames without RENAME_EXCHANGE are
more obviously the normal case.
Tradeoffs:
This change improves performance, at a slight size increase to the
layer masks data structure.
This fixes the size of the data structure at 32 bytes for all types of
access rights. (64, once we introduce a 17th filesystem access right).
For filesystem access rights, at the moment, the data structure has
the same size as before, but once we introduce the 17th filesystem
access right, it will double in size (from 32 to 64 bytes), as
access_mask_t grows from 16 to 32 bit [1].
Link: https://lore.kernel.org/all/20260120.haeCh4li9Vae@digikod.net/ [1]
Signed-off-by: Günther Noack <gnoack3000@gmail.com>
Link: https://lore.kernel.org/r/20260206151154.97915-5-gnoack3000@gmail.com
[mic: Cosmetic fixes, moved struct layer_access_masks definition]
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Pull selinux updates from Paul Moore:
- Add support for SELinux based access control of BPF tokens
We worked with the BPF devs to add the necessary LSM hooks when the
BPF token code was first introduced, but it took us a bit longer to
add the SELinux wiring and support.
In order to preserve existing token-unaware SELinux policies, the new
code is gated by the new "bpf_token_perms" policy capability.
Additional details regarding the new permissions, and behaviors can
be found in the associated commit.
- Remove a BUG() from the SELinux capability code
We now perform a similar check during compile time so we can safely
remove the BUG() call.
* tag 'selinux-pr-20260203' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
selinux: drop the BUG() in cred_has_capability()
selinux: fix a capabilities parsing typo in selinux_bpf_token_capable()
selinux: add support for BPF token access control
selinux: move the selinux_blob_sizes struct
Pull lsm updates from Paul Moore:
- Unify the security_inode_listsecurity() calls in NFSv4
While looking at security_inode_listsecurity() with an eye towards
improving the interface, we realized that the NFSv4 code was making
multiple calls to the LSM hook that could be consolidated into one.
- Mark the LSM static branch keys as static - this helps resolve some
sparse warnings
- Add __rust_helper annotations to the LSM and cred wrapper functions
- Remove the unsused set_security_override_from_ctx() function
- Minor fixes to some of the LSM kdoc comment blocks
* tag 'lsm-pr-20260203' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm:
lsm: make keys for static branch static
cred: remove unused set_security_override_from_ctx()
rust: security: add __rust_helper to helpers
rust: cred: add __rust_helper to helpers
nfs: unify security_inode_listsecurity() calls
lsm: fix kernel-doc struct member names
Add errata section with code examples for querying errata and a warning
that most applications should not check errata. Use kernel-doc directives
to include errata descriptions from the header files instead of manual
links.
Also enhance existing DOC sections in security/landlock/errata/abi-*.h
files with Impact sections, and update the code comment in syscalls.c
to remind developers to update errata documentation when applicable.
This addresses the gap where the kernel implements errata tracking
but provides no user-facing documentation on how to use it, while
improving the existing technical documentation in-place rather than
duplicating it.
Signed-off-by: Samasth Norway Ananda <samasth.norway.ananda@oracle.com>
Reviewed-by: Günther Noack <gnoack3000@gmail.com>
Link: https://lore.kernel.org/r/20260128031814.2945394-3-samasth.norway.ananda@oracle.com
[mic: Cosmetic fix]
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Move the socket type check earlier, so that we will later be able to add
elseifs for other types. Ordering of checks (socket is of a type we
enforce restrictions on) / (current creds have Landlock restrictions)
should not change anything.
Signed-off-by: Matthieu Buffet <matthieu@buffet.re>
Link: https://lore.kernel.org/r/20251212163704.142301-3-matthieu@buffet.re
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Kees Cook
Linus Torvalds
Massimiliano Pellizzer
Lorenzo Stoakes
Günther Noack
Samasth Norway Ananda
Matthieu Buffet