From: Chris Down <chris@chrisdown.name>
To: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Kees Cook <kees@kernel.org>
Cc: Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>,
K Prateek Nayak <kprateek.nayak@amd.com>,
Ard Biesheuvel <ardb@kernel.org>, Will Deacon <will@kernel.org>,
Sami Tolvanen <samitolvanen@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Shuah Khan <skhan@linuxfoundation.org>,
Randy Dunlap <rdunlap@infradead.org>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Paul Walmsley <pjw@kernel.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Alexandre Ghiti <alex@ghiti.fr>,
linux-arm-kernel@lists.infradead.org,
linux-riscv@lists.infradead.org, linux-doc@vger.kernel.org,
linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-team@meta.com
Subject: [PATCH 0/3] Make the scheduler stack end check selectable at boot
Date: Tue, 27 Oct 2026 14:36:01 +0800 [thread overview]
Message-ID: <cover.1793082868.git.chris@chrisdown.name> (raw)
At Meta, some of our host types enable CONFIG_SCHED_STACK_END_CHECK, but
we don't want it generally on because of the extra work on every context
switch.
Right now this is only configurable by setting the Kconfig option at
build time. Let's make it so we can also select it at boot with
sched_stack_end_check=, so that those hosts can share one kernel image.
(Patch 1 is a cleanup I happened upon while working on this, it can
also be taken independently.)
Chris Down (3):
sched/core: Skip the shadow stack end check when SCS is disabled
sched/core: Add sched_stack_end_check= boot parameter
lkdtm/bugs: Add CORRUPT_STACK_END to test the scheduler stack end
check
.../admin-guide/kernel-parameters.txt | 8 +++++
drivers/misc/lkdtm/bugs.c | 21 ++++++++++++
kernel/sched/core.c | 33 +++++++++++++++----
tools/testing/selftests/lkdtm/tests.txt | 1 +
4 files changed, 57 insertions(+), 6 deletions(-)
base-commit: b99b7f60c5b473d374c68b53753153b4aa9e0702
--
2.54.0
next reply other threads:[~2026-10-27 6:36 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-27 6:36 Chris Down [this message]
2026-10-27 6:36 ` [PATCH 1/3] sched/core: Skip the shadow stack end check when SCS is disabled Chris Down
2026-10-27 10:08 ` Peter Zijlstra
2026-10-27 6:36 ` [PATCH 2/3] sched/core: Add sched_stack_end_check= boot parameter Chris Down
2026-10-27 10:17 ` Peter Zijlstra
2026-10-27 23:34 ` Randy Dunlap
2026-10-27 6:36 ` [PATCH 3/3] lkdtm/bugs: Add CORRUPT_STACK_END to test the scheduler stack end check Chris Down
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