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@igalia.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Waiman Long <longman@redhat.com>

diff --git a/tools/testing/selftests/futex/functional/futex_numa_mpol.c b/tools/testing/selftests/futex/functional/futex_numa_mpol.c
index dd7b05e..5f4e311 100644 (file)
--- 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, EINVAL);
 
+       ksft_print_msg("Memory out of range\n");
+       test_futex(futex_ptr + mem_size, EFAULT);
+
        futex_numa->numa = FUTEX_NO_NODE;
        mprotect(futex_ptr, mem_size, PROT_READ);
        ksft_print_msg("Memory, RO\n");