linux-kernel - [PATCH 2/2] selftest/futex: Reintroduce "Memory out of range" numa

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Message-ID: <20250901203327.53887-2-andrealmeid@igalia.com>
Date: Mon,  1 Sep 2025 17:33:27 -0300
From: André Almeida <andrealmeid@...lia.com>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-kernel@...r.kernel.org
Cc: Darren Hart <dvhart@...radead.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	Ingo Molnar <mingo@...hat.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Waiman Long <longman@...hat.com>,
	kernel-dev@...lia.com,
	André Almeida <andrealmeid@...lia.com>
Subject: [PATCH 2/2] selftest/futex: Reintroduce "Memory out of range" numa_mpol's subtest

Commit d8e2f919997 ("selftests/futex: Fix some futex_numa_mpol
subtests") removed the "Memory out of range" subtest due to it being
dependent on the memory layout of the test process having an invalid
memory address just after the `*futex_ptr` allocated memory.

Reintroduce this test and make it deterministic, by allocation two
memory pages and marking the second one with PROT_NONE.

Signed-off-by: André Almeida <andrealmeid@...lia.com>
---
This patch is aimed for 6.18
---
 .../testing/selftests/futex/functional/futex_numa_mpol.c  | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/futex/functional/futex_numa_mpol.c b/tools/testing/selftests/futex/functional/futex_numa_mpol.c
index c84441751235..e4b840184b1d 100644
--- a/tools/testing/selftests/futex/functional/futex_numa_mpol.c
+++ b/tools/testing/selftests/futex/functional/futex_numa_mpol.c
@@ -174,10 +174,13 @@ int main(int argc, char *argv[])
 	ksft_set_plan(1);
 
 	mem_size = sysconf(_SC_PAGE_SIZE);
-	futex_ptr = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+	futex_ptr = mmap(NULL, mem_size * 2, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
 	if (futex_ptr == MAP_FAILED)
 		ksft_exit_fail_msg("mmap() for %d bytes failed\n", mem_size);
 
+	/* Create an invalid memory region for the "Memory out of range" test */
+	mprotect(futex_ptr + mem_size, mem_size, PROT_NONE);
+
 	futex_numa = futex_ptr;
 
 	ksft_print_msg("Regular test\n");
@@ -192,6 +195,9 @@ int main(int argc, char *argv[])
 	ksft_print_msg("Mis-aligned futex\n");
 	test_futex(futex_ptr + mem_size - 4, 22);
 
+	ksft_print_msg("Memory out of range\n");
+	test_futex(futex_ptr + mem_size, 14);
+
 	futex_numa->numa = FUTEX_NO_NODE;
 	mprotect(futex_ptr, mem_size, PROT_READ);
 	ksft_print_msg("Memory, RO\n");
-- 
2.51.0