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AKwUvBy1Kx9n84pSwg0T6ruLS1wXaOHbsk83sDWUn9eNu2cX2a0W6J91tl+OgTiOw1WOEJv2neJQ6zA6jwiguAvr2g==@lists.linux.dev X-Gm-Message-State: AFq9FYJk3M1URzbiwR+fah4NrOQJuDAnkQ60/NW8uPBTnkHIMpI5EegF LuvpvO8pdDhJ10dXf7z6NGzm3c71EB7+sCDrld0gTM18g4/fGuQmJevoByXUcFXloIPhr6Tct9S 8VmOm4WROWRCg7A== X-Received: from wrck15.prod.google.com ([2002:a5d:524f:0:b0:489:bd7b:5942]) (user=smostafa job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6000:2010:b0:488:7803:c1ef with SMTP id ffacd0b85a97d-4887db496acmr19692502f8f.48.1790617316679; Mon, 28 Sep 2026 10:41:56 -0700 (PDT) Date: Mon, 28 Sep 2026 17:41:15 +0000 In-Reply-To: <20260928174122.3380703-1-smostafa@google.com> Precedence: bulk X-Mailing-List: linux-rt-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260928174122.3380703-1-smostafa@google.com> X-Mailer: git-send-email 2.56.0.rc1.315.gc6ed9934b7-goog Message-ID: <20260928174122.3380703-9-smostafa@google.com> Subject: [RFC PATCH 08/15] mm: kmemleak: Don't assume the kernel stack size From: Mostafa Saleh To: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-hardening@vger.kernel.org, linux-rt-devel@lists.linux.dev Cc: corbet@lwn.net, skhan@linuxfoundation.org, rdunlap@infradead.org, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, akpm@linux-foundation.org, urezki@gmail.com, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, kprateek.nayak@amd.com, kees@kernel.org, david@kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, gustavoars@kernel.org, bigeasy@linutronix.de, clrkwllms@kernel.org, Mostafa Saleh Content-Type: text/plain; charset="UTF-8" kmemleak_scan_task_stacks() assumes that the kernel stack size is THREAD_SIZE. The allocated kernel stack size may not be THREAD_SIZE anymore, rely on the newly introduced helpers task_stack_{low, high}() Signed-off-by: Mostafa Saleh --- mm/kmemleak.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/kmemleak.c b/mm/kmemleak.c index 8fa409a4f9fb..72e2c628a20b 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -1749,7 +1749,7 @@ static void kmemleak_scan_task_stacks(void) void *stack = try_get_task_stack(p); if (stack) { - stop = scan_block(stack, stack + THREAD_SIZE, NULL); + stop = scan_block(task_stack_low(p), task_stack_high(p), NULL); put_task_stack(p); } put_task_struct(p); -- 2.56.0.rc1.315.gc6ed9934b7-goog