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SeongJae Park 24fda22849 mm/damon/core: disallow non-power of two min_region_sz 
[ Upstream commit c80f46ac22 ]

DAMON core uses min_region_sz parameter value as the DAMON region
alignment.  The alignment is made using ALIGN() and ALIGN_DOWN(), which
support only the power of two alignments.  But DAMON core API callers can
set min_region_sz to an arbitrary number.  Users can also set it
indirectly, using addr_unit.

When the alignment is not properly set, DAMON behavior becomes difficult
to expect and understand, makes it effectively broken.  It doesn't cause a
kernel crash-like significant issue, though.

Fix the issue by disallowing min_region_sz input that is not a power of
two.  Add the check to damon_commit_ctx(), as all DAMON API callers who
set min_region_sz uses the function.

This can be a sort of behavioral change, but it does not break users, for
the following reasons.  As the symptom is making DAMON effectively broken,
it is not reasonable to believe there are real use cases of non-power of
two min_region_sz.  There is no known use case or issue reports from the
setup, either.

In future, if we find real use cases of non-power of two alignments and we
can support it with low enough overhead, we can consider moving the
restriction.  But, for now, simply disallowing the corner case should be
good enough as a hot fix.

Link: https://lkml.kernel.org/r/20260214214124.87689-1-sj@kernel.org
Fixes: d8f867fa08 ("mm/damon: add damon_ctx->min_sz_region")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Quanmin Yan <yanquanmin1@huawei.com>
Cc: <stable@vger.kernel.org>	[6.18+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
[ min_region_sz => min_sz_region ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-03-19 16:08:51 +01:00
arch KVM: SVM: Set/clear CR8 write interception when AVIC is (de)activated 2026-03-19 16:08:50 +01:00
block block: use trylock to avoid lockdep circular dependency in sysfs 2026-03-12 07:09:59 -04:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec 2026-01-30 10:32:12 +01:00
Documentation KVM: x86: Introduce KVM_X86_QUIRK_VMCS12_ALLOW_FREEZE_IN_SMM 2026-03-19 16:08:24 +01:00
drivers mmc: dw_mmc-rockchip: Fix runtime PM support for internal phase support 2026-03-19 16:08:49 +01:00
fs ksmbd: Compare MACs in constant time 2026-03-19 16:08:50 +01:00
include io_uring: ensure ctx->rings is stable for task work flags manipulation 2026-03-19 16:08:51 +01:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring/eventfd: use ctx->rings_rcu for flags checking 2026-03-19 16:08:51 +01:00
ipc ipc: don't audit capability check in ipc_permissions() 2026-02-26 14:59:19 -08:00
kernel kprobes: Remove unneeded warnings from __arm_kprobe_ftrace() 2026-03-19 16:08:44 +01:00
lib lib/crypto: tests: Depend on library options rather than selecting them 2026-03-19 16:08:50 +01:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm mm/damon/core: disallow non-power of two min_region_sz 2026-03-19 16:08:51 +01:00
net net/tcp-md5: Fix MAC comparison to be constant-time 2026-03-19 16:08:50 +01:00
rust rust: str: make NullTerminatedFormatter public 2026-03-19 16:08:24 +01:00
samples samples/ftrace: Adjust LoongArch register restore order in direct calls 2026-01-08 10:17:11 +01:00
scripts kbuild: rpm-pkg: Disable automatic requires for manual debuginfo package 2026-03-04 07:21:32 -05:00
security apparmor: fix race between freeing data and fs accessing it 2026-03-13 17:23:30 +01:00
sound ALSA: usb-audio: Improve Focusrite sample rate filtering 2026-03-19 16:08:31 +01:00
tools kbuild: Leave objtool binary around with 'make clean' 2026-03-19 16:08:50 +01:00
usr gen_init_cpio: Ignore fsync() returning EINVAL on pipes 2025-10-07 09:53:05 -07:00
virt KVM: Don't clobber irqfd routing type when deassigning irqfd 2026-02-11 13:41:44 +01:00
.clang-format memblock: drop for_each_free_mem_pfn_range_in_zone_from() 2025-09-14 08:49:03 +03:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore compile_commands.json globally 2025-08-12 15:53:55 -07:00
.mailmap 8 hotfixes. 4 are cc:stable, 7 are against mm/. 2025-11-26 12:38:05 -08:00
.pylintrc tools: docs: parse-headers.py: move it from sphinx dir 2025-08-29 15:54:42 -06:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: mark ISDN subsystem as orphan 2025-10-27 17:49:45 -07:00
Kbuild sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS soc: fixes for 6.18, part 4 2025-11-28 09:57:31 -08:00
Makefile kbuild: Leave objtool binary around with 'make clean' 2026-03-19 16:08:50 +01:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.